source: palm/trunk/SOURCE/modules.f90 @ 2333

!> @file modules.f90
!------------------------------------------------------------------------------!
! This file is part of PALM.
!
! PALM is free software: you can redistribute it and/or modify it under the
! terms of the GNU General Public License as published by the Free Software
! Foundation, either version 3 of the License, or (at your option) any later
! version.
!
! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License along with
! PALM. If not, see <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2017 Leibniz Universitaet Hannover
!------------------------------------------------------------------------------!
!
! Current revisions:
! ------------------
! 
! 
! Former revisions:
! -----------------
! $Id: modules.f90 2326 2017-08-01 07:23:24Z maronga $
! Updated variable descriptions
! 
! 2320 2017-07-21 12:47:43Z suehring
! -ptnudge, qnudge, tnudge, td_lsa_lpt, td_lsa_q, td_sub_lpt, td_sub_q, ug_vert,
!  vg_vert, unudge, vnudge, wsubs_vert, shf_surf, p_surf, pt_surf, q_surt,
!  qsws_surf, tmp_tnudge, timenudge, time_surf, time_vert
! 
! 2300 2017-06-29 13:31:14Z raasch
! default value for host changed to '????', default value for loop_optimization
! changed to 'cache', default value for termination_time_needed set to 35.0
! 
! 2298 2017-06-29 09:28:18Z raasch
! missing variable descriptions have been added,
! type of write_binary changed from CHARACTER to LOGICAL
! -plot_precision, plot_3d_precision, return_addres, return_username,
! avs_data_file, exchange_mg, sendrecvcound_yxd, sendrecv_in_background,
! port_name, profile_number, cross_ts_numbers, cross_ts_number_count,
! dots_crossindex, dots_index, cross_ts_uymax, cross_ts_uymax_computed,
! cross_ts_uymin, cross_ts_uymin_computed
! 
! 2296 2017-06-28 07:53:56Z maronga
! Added parameters for model spinup
! 
! 2292 2017-06-20 09:51:42Z schwenkel
! Implementation of new microphysic scheme: cloud_scheme = 'morrison' 
! includes two more prognostic equations for cloud drop concentration (nc)  
! and cloud water content (qc). 
! 
! 2277 2017-06-12 10:47:51Z kanani
! Added doxygen comments for variables/parameters,
! removed unused variables dissipation_control, do2d_xy_n, do2d_xz_n, do2d_yz_n, 
! do3d_avs_n, lptnudge, lqnudge, lunudge, lvnudge, lwnudge, skip_do_avs, 
! sums_up_fraction_l.
! 
! 2259 2017-06-08 09:09:11Z gronemeier
! Implemented synthetic turbulence generator
!
! 2256 2017-06-07 13:58:08Z suehring
! Change default value of zeta_min to -20
! Increase dimension for wall_heatflux, etc. 
! 
! 2233 2017-05-30 18:08:54Z suehring
!
! 2232 2017-05-30 17:47:52Z suehring
! Renamed wall_flags_0 and wall_flags_00 into advc_flags_1 and advc_flags_2, 
! respectively. Moreover, introduced further flag array wall_flags_0. 
!
! Adjustments for new topography concept:
!   -fwxm, fwxp, fwym, fwyp, fxm, fxp, fym, fyp, rif_wall, wall_e_x, wall_e_y, 
!   -wall_v, wall_u, wall_w_x, wall_w_y, wall_qflux, wall_sflux, wall_nrflux, 
!   -wall_qrflux
!
! Adjustments for new surface concept:
!   +land_surface
!   -z0, z0h, z0q, us, ts, qs, qsws, nrs, nrsws, qrs, qrsws, ssws, ss, saswsb 
!   -nzb_diff_u, nzb_diff_v, nzt_diff
!   -uswst, vswst, tswst, sswst, saswst, qswst, qrswst, nrswst, qswst_remote
!
! Generic tunnel setup:
!   +tunnel_height, tunnel_length, tunnel_width_x, tunnel_width_y, 
!   +tunnel_wall_depth
!
! Topography input via netcdf
!   +lod
! 
! 2200 2017-04-11 11:37:51Z suehring
! -monotonic_adjustment
! 
! 2174 2017-03-13 08:18:57Z maronga
! Changed default values for most_method to 'newton'
! 
! 2118 2017-01-17 16:38:49Z raasch
! -acc_rank, background_communication, i_left, i_right, j_south, j_north,
!  num_acc_per_node, on_device
! 
! 2107 2017-01-09 12:21:49Z kanani
! Preparation for doxygen comments (Giersch)
! 
! 2050 2016-11-08 15:00:55Z gronemeier
! Implement turbulent outflow condition
! 
! 2037 2016-10-26 11:15:40Z knoop
! Anelastic approximation implemented
! 
! 2031 2016-10-21 15:11:58Z knoop
! renamed variable rho to rho_ocean and rho_av to rho_ocean_av
! 
! 2011 2016-09-19 17:29:57Z kanani
! +urban_surface, +lsf_exception, +varnamelength
! 
! 2007 2016-08-24 15:47:17Z kanani
! Increased DIMENSION of data_output, data_output_user, do2d, do3d
! 
! 2000 2016-08-20 18:09:15Z knoop
! Forced header and separation lines into 80 columns
! 
! 1992 2016-08-12 15:14:59Z suehring
! +constant_top_scalarflux, top_scalarflux
! default of bc_s_t adjusted
! 
! 1968 2016-07-18 12:01:49Z suehring
! Changed dimension for MPI-datatypes type_x_int and type_y_int
! 
! 1960 2016-07-12 16:34:24Z suehring
! Separate humidity and passive scalar
! +bc_s_t_val, diss_s_s, diss_l_s, flux_s_s, flux_l_s, s, sp, s1, s2, s3, ssws_av, 
!  s_init, s_surf, sums_wsss_ws_l, ss, ssws, sswst, ts_m, wall_sflux
! +constant_scalarflux, ibc_s_b, ibc_s_t, s_vertical_gradient_level_ind
!
! Unused variables removed
! -gamma_x, gamma_y, gamma_z, var_x, var_y, var_z
!
! Change initial values (in order to unify gradient calculation): 
! pt_vertical_gradient_level, sa_vertical_gradient_level
!
! 1957 2016-07-07 10:43:48Z suehring
! +fl_max, num_leg, num_var_fl, num_var_fl_user, var_fl_max, virtual_flight
! 
! 1918 2016-05-27 14:35:57Z raasch
! default timestep switched from -1.0 to +1.0 in order to avoid wrong sign of
! initially calculated divergence
!
! 1906 2016-05-24 14:38:08Z suehring
! default value of mg_switch_to_pe0_level changed to -1
!
! 1849 2016-04-08 11:33:18Z hoffmann
! bfactor, mass_of_solute, molecular_weight_of_solute, molecular_weight_of_water,
! vanthoff moved to mod_particle_attributes.
! dt_micro and several cloud_parameters moved to microphysics_mod.
! 1d-microphysics profiles moved to microphysics_mod.
!
! 1845 2016-04-08 08:29:13Z raasch
! -nzb_2d
!
! 1833 2016-04-07 14:23:03Z raasch
! spectra parameter moved to spectra module
!
! 1831 2016-04-07 13:15:51Z hoffmann
! curvature_solution_effects removed
! turbulence renamed collision_turbulence, drizzle renamed 
! cloud_water_sedimentation
!
! 1822 2016-04-07 07:49:42Z hoffmann
! icloud_scheme removed. microphysics_sat_adjust, microphysics_kessler,
! microphysics_seifert added.
!
! 1815 2016-04-06 13:49:59Z raasch
! cpp-directive for decalpha removed
!
! 1808 2016-04-05 19:44:00Z raasch
! MPI module used by default on all machines
!
! 1804 2016-04-05 16:30:18Z maronga
! Removed code for parameter file check (__check)
! 
! 1788 2016-03-10 11:01:04Z maronga
! Added roughness length for moisture (z0q)
!
! 1786 2016-03-08 05:49:27Z raasch
! module spectrum moved to new separate module
!
! 1783 2016-03-06 18:36:17Z raasch
! netcdf variables moved to the netcdf-interface module
!
! 1779 2016-03-03 08:01:28Z raasch
! coupling_char extended to LEN=3
!
! 1764 2016-02-28 12:45:19Z raasch
! some reformatting
!
! 1762 2016-02-25 12:31:13Z hellstea
! +nest_* variables, size of volume_flow arrays increased by one element
!
! 1738 2015-12-18 13:56:05Z raasch
! +mean_surface_level_height
!
! 1695 2015-10-27 10:03:11Z maronga
! Removed rif (forgotten in last revision)
! 
! 1693 2015-10-27 08:35:45Z maronga
! Renamed zp -> z_mo
! 
! 1691 2015-10-26 16:17:44Z maronga
! Renamed Obukhov length. Added ol, removed rif. Increased number of profiles 
! (pr_palm). Changed default values for dissipation_1d to 'detering' and 
! (mixing_length_1d to 'blackadar'. Added most_method. rif_min and rif_max
! renamed to zeta_min and zeta_max and new values assigned.
! 
! 1682 2015-10-07 23:56:08Z knoop
! Code annotations made doxygen readable 
! 
! 1677 2015-10-02 13:25:23Z boeske
! +ngp_yz_int, type_xz_int, type_yz_int
! 
! 1666 2015-09-23 07:31:10Z raasch
! +user_interface_current_revision, user_interface_required_revision in
! control_parameters
!
! 1639 2015-08-31 14:46:48Z knoop
! Bugfix: string 'unknown' extended to match LEN=13 
!
! 1575 2015-03-27 09:56:27Z raasch
! +ngp_xz
!
! 1560 2015-03-06 10:48:54Z keck
! +recycling_yshift
! 
! 1557 2015-03-05 16:43:04Z suehring
! +monotonic_adjustment
! 
! 1551 2015-03-03 14:18:16Z maronga
! Increased pr_palm to 120. Increased length of dots_unit and dots_label to 13
! digits. Increased length of domask, do2d, and do3d to 20 digits.
! 
! 1496 2014-12-02 17:25:50Z maronga
! Renamed "radiation" -> "cloud_top_radiation"
! 
! 1484 2014-10-21 10:53:05Z kanani
! Changes due to new module structure of the plant canopy model:
!   canopy-model related parameters/variables moved to module 
!   plant_canopy_model_mod
! 
! 1468 2014-09-24 14:06:57Z maronga
! Adapted for use on up to 6-digit processor cores.
! Increased identifier string length for user-defined quantities to 20.
! 
! 1450 2014-08-21 07:31:51Z heinze
! ntnudge from 100 to 1000 increased to allow longer simulations
! 
! 1431 2014-07-15 14:47:17Z suehring
! +var_d
! 
! 1429 2014-07-15 12:53:45Z knoop
! +ensemble_member_nr to prepare the random_generator for ensemble runs
!
! 1382 2014-04-30 12:15:41Z boeske
! Renamed variables which store large scale forcing tendencies
! pt_lsa -> td_lsa_lpt, pt_subs -> td_sub_lpt, 
! q_lsa  -> td_lsa_q,   q_subs  -> td_sub_q
! 
! 1365 2014-04-22 15:03:56Z boeske
! Usage of large scale forcing enabled:
! increase pr_palm from 90 to 100 to allow for more standard profiles
! + ngp_sums_ls, pt_lsa, pt_subs, q_lsa, q_subs, tmp_tnudge, sums_ls_l, 
! use_subsidence_tendencies
! 
! 1361 2014-04-16 15:17:48Z hoffmann
! tend_* removed
! call_microphysics_at_all_substeps added
! default of drizzle set to true
! 
! 1359 2014-04-11 17:15:14Z hoffmann
! particle_attributes moved to mod_particle_attributes.f90
! 
! 1353 2014-04-08 15:21:23Z heinze
! REAL constants provided with KIND-attribute
! 
! 1327 2014-03-21 11:00:16Z raasch
! REAL constants defined as wp-kind
! -avs_output, data_output_format, do3d_compress, iso2d_output, netcdf_output
!
! 1320 2014-03-20 08:40:49Z raasch
! ONLY-attribute added to USE-statements,
! kind-parameters added to all INTEGER and REAL declaration statements,
! kinds are defined in new module kinds,
! old module precision_kind is removed,
! revision history before 2012 removed,
! comment fields (!:) to be used for variable explanations added to
! all variable declaration statements
!
! 1318 2014-03-17 13:35:16Z raasch
! module cpulog moved to new separate module-file
! interface for cpu_log removed
!
! 1314 2014-03-14 18:25:17Z suehring
! + log_z_z0, number_of_sublayers, z0_av_global 
! 1308 2014-03-13 14:58:42Z fricke
! +ntdim_2d_xy, ntdim_2d_xz, ntdim_2d_yz, ntdim_3d
!
! 1257 2013-11-08 15:18:40Z raasch
! set default values for grid indices of maximum velocity components
! u|v|w_max_ijk
!
! 1241 2013-10-30 11:36:58Z heinze
! Usage of nudging enabled 
! +nudging, ntnudge, ptnudge, qnudge, tnudge, unudge, vnudge, wnudge
! increase pr_palm from 80 to 90 to allow for more standard profiles
!
! Enable prescribed time depenend surface fluxes and geostrophic wind read in
! from external file LSF_DATA
! +large_scale_forcing, lsf_surf, lsf_vert, nlsf, time_surf, shf_surf, qsws_surf,
!  pt_surf, q_surf, p_surf, time_vert, ug_vert, vg_vert, wsubs_vert
!
! 1221 2013-09-10 08:59:13Z raasch
! wall_flags_0 changed to 32bit int, +wall_flags_00,
! +rflags_s_inner, rflags_invers
!
! 1216 2013-08-26 09:31:42Z raasch
! +transpose_compute_overlap,
! several variables are now defined in the serial (non-parallel) case also
!
! 1212 2013-08-15 08:46:27Z raasch
! +tri
!
! 1179 2013-06-14 05:57:58Z raasch
! +reference_state, ref_state, use_initial_profile_as_reference, vpt_reference,
! use_reference renamed use_single_reference_value
!
! 1159 2013-05-21 11:58:22Z fricke
! -bc_lr_dirneu, bc_lr_neudir, bc_ns_dirneu, bc_ns_neudir
! +use_cmax
!
! 1128 2013-04-12 06:19:32Z raasch
! +background_communication, i_left, i_right, j_north, j_south, req, req_count,
! send_receive, sendrecv_in_background, wait_stat
!
! 1115 2013-03-26 18:16:16Z hoffmann
! unused variables removed
!
! 1113 2013-03-10 02:48:14Z raasch
! +on_device
!
! 1111 2013-03-08 23:54:10Z raasch
! +tric, nr_timesteps_this_run
!
! 1106 2013-03-04 05:31:38Z raasch
! array_kind renamed precision_kind, pdims defined in serial code
! bugfix: default value assigned to coupling_start_time
!
! 1095 2013-02-03 02:21:01Z raasch
! FORTRAN error in r1092 removed
!
! 1092 2013-02-02 11:24:22Z raasch
! character length in some derived type changed for better alignment
!
! 1065 2012-11-22 17:42:36Z hoffmann
! + c_sedimentation, limiter_sedimentation, turbulence, a_1, a_2, a_3, b_1, b_2, 
! + b_3, c_1, c_2, c_3, beta_cc
!
! bottom boundary condition of qr, nr changed from Dirichlet to Neumann
!
! 1053 2012-11-13 17:11:03Z hoffmann
! necessary expansions according to the two new prognostic equations (nr, qr) 
! of the two-moment cloud physics scheme:
! +*_init, flux_l_*, diss_l_*, flux_s_*, diss_s_*, *sws, *swst, tend_*, *, *_p
! +t*_m, *_1, *_2, *_3, *_av, bc_*_b, bc_*_t, ibc_*_b, ibc_*_t, bc_*_t_val, 
! +*_vertical_gradient, *_surface_initial_change, *_vertical_gradient_level, 
! +*_vertical_gradient_level_ind, *_surface, constant_waterflux_*,  
! +cloud_scheme, icloud_scheme, surface_waterflux_*, sums_ws*s_ws_l, wall_*flux
!
! constants for the two-moment scheme:
! +a_vent, a_term, b_vent, b_term, c_evap, c_term, cof, eps_sb, k_cc, k_cr, k_rr, 
! +k_br, kappa_rr, kin_vis_air, mu_constant_value, nc, pirho_l, dpirho_l, rho_1,
! +schmidt, schmidt_p_1d3, stp, x0, xmin, xmax, dt_precipitation, w_precipitation
!
! steering parameters for the two_moment scheme:
! +mu_constant, ventilation_effect
!
! 1036 2012-10-22 13:43:42Z raasch
! code put under GPL (PALM 3.9)
!
! 1031 2012-10-19 14:35:30Z raasch
! +output_format_netcdf
!
! 1015 2012-09-27 09:23:24Z raasch
! +acc_rank, num_acc_per_node,
! -adjust_mixing_length
!
! 1010 2012-09-20 07:59:54Z raasch
! pointer free version can be generated with cpp switch __nopointer
!
! 1003 2012-09-14 14:35:53Z raasch
! -grid_matching, nxa, nya, etc., nnx_pe, nny_pe, spl_*
!
! 1001 2012-09-13 14:08:46Z raasch
! -asselin_filter_factor, cut_spline_overshoot, dt_changed, last_dt_change,
! last_dt_change_1d, long_filter_factor, overshoot_limit_*, ups_limit_*
! several pointer/target arrays converted to normal ones
!
! 996 2012-09-07 10:41:47Z raasch
! -use_prior_plot1d_parameters
!
! 978 2012-08-09 08:28:32Z fricke
! +c_u_m, c_u_m_l, c_v_m, c_v_m_l, c_w_m, c_w_m_l,
! +bc_lr_dirneu, bc_lr_neudir, bc_ns_dirneu, bc_ns_neudir
! -km_damp_x, km_damp_y, km_damp_max, outflow_damping_width
! +z0h, z0h_av, z0h_factor, z0h1d
! +ptdf_x, ptdf_y, pt_damping_width, pt_damping_factor 
!
! 964 2012-07-26 09:14:24Z raasch
! -cross_linecolors, cross_linestyles, cross_normalized_x, cross_normx_factor,
! cross_normalized_y, cross_normy_factor, cross_pnc_local,
! cross_profile_numbers, cross_profile_number_counter, cross_uxmax,
! cross_uxmax_computed, cross_uxmax_normalized,
! cross_uxmax_normalized_computed, cross_uxmin, cross_uxmin_computed,
! cross_uxmin_normalized, cross_uxmin_normalized_computed, cross_uymax,
! cross_uymin, cross_xtext, dopr_crossindex, dopr_label, linecolors, linestyles,
! nz_do1d, profil_output, z_max_do1d, z_max_do1d_normalized
!
! 951 2012-07-19 14:22:52Z hoffmann
! changing profile_columns and profile_rows
!
! 940 2012-07-09 14:31:00Z raasch
! +neutral
!
! 927 2012-06-06 19:15:04Z raasch
! +masking_method
!
! 880 2012-04-13 06:28:59Z raasch
! gathered_size, subdomain_size moved to control_parameters
!
! 866 2012-03-28 06:44:41Z raasch
! interface for global_min_max changed
!
! 861 2012-03-26 14:18:34Z suehring
! +wall_flags_0
! -boundary_flags
! +nzb_max
! +adv_sca_1, +adv_mom_1
!
! 849 2012-03-15 10:35:09Z raasch
! +deleted_particles, deleted_tails, tr.._count_sum, tr.._count_recv_sum in
! particle_attributes,
! +de_dx, de_dy, de_dz in arrays_3d,
! first_call_advec_particles renamed first_call_lpm
!
! 828 2012-02-21 12:00:36Z raasch
! +dissipation_classes, radius_classes, use_kernel_tables,
! particle feature color renamed class
!
! 825 2012-02-19 03:03:44Z raasch
! +bfactor, curvature_solution_effects, eps_ros, molecular_weight_of_water,
! vanthoff, -b_cond in cloud_parameters,
! dopts_num increased to 29, particle attributes speed_x|y|z_sgs renamed
! rvar1|2|3
! wang_collision_kernel and turbulence_effects_on_collision replaced by
! collision_kernel, hall_kernel, palm_kernel, wang_kernel
!
! 809 2012-01-30 13:32:58Z marongas
! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
!
! 807 2012-01-25 11:53:51Z maronga
! New cpp directive "__check" implemented which is used by check_namelist_files.
! New parameter check_restart has been defined which is needed by 
! check_namelist_files only.
!
! 805 2012-01-17 15:53:28Z franke
! Bugfix collective_wait must be out of parallel branch for runs in serial mode
!
! 801 2012-01-10 17:30:36Z suehring
! Dimesion of sums_wsus_ws_l, ! sums_wsvs_ws_l, sums_us2_ws_l, sums_vs2_ws_l,
! sums_ws2_ws_l, sums_wspts_ws_l, sums_wsqs_ws_l, sums_wssas_ws_l increased.
! for thread-safe summation in advec_ws.
!
! RCS Log replace by Id keyword, revision history cleaned up
!
! Revision 1.95  2007/02/11 13:18:30  raasch
! version 3.1b (last under RCS control)
!
! Revision 1.1  1997/07/24 11:21:26  raasch
! Initial revision
!
!
!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of global variables
!------------------------------------------------------------------------------!


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables for special advection schemes.
!------------------------------------------------------------------------------!
 MODULE advection
 
    USE kinds

    REAL(wp), DIMENSION(:), ALLOCATABLE ::  aex  !< exponential coefficient for the Bott-Chlond advection scheme
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  bex  !< exponential coefficient for the Bott-Chlond advection scheme
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  dex  !< exponential coefficient for the Bott-Chlond advection scheme
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  eex  !< exponential coefficient for the Bott-Chlond advection scheme
    
    SAVE

 END MODULE advection


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of all arrays defined on the computational grid.
!------------------------------------------------------------------------------!
 MODULE arrays_3d

    USE kinds

    REAL(wp), DIMENSION(:), ALLOCATABLE ::  c_u_m                  !< mean phase velocity at outflow for u-component used in radiation boundary condition
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  c_u_m_l                !< mean phase velocity at outflow for u-component used in radiation boundary condition (local subdomain value)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  c_v_m                  !< mean phase velocity at outflow for v-component used in radiation boundary condition
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  c_v_m_l                !< mean phase velocity at outflow for v-component used in radiation boundary condition (local subdomain value)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  c_w_m                  !< mean phase velocity at outflow for w-component used in radiation boundary condition
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  c_w_m_l                !< mean phase velocity at outflow for w-component used in radiation boundary condition (local subdomain value)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ddzu                   !< 1/dzu 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ddzu_pres              !< modified ddzu for pressure solver 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  dd2zu                  !< 1/(dzu(k)+dzu(k+1)) 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  dzu                    !< vertical grid size (u-grid) 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ddzw                   !< 1/dzw 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  dzw                    !< vertical grid size (w-grid) 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  hyp                    !< hydrostatic pressure 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  inflow_damping_factor  !< used for turbulent inflow (non-cyclic boundary conditions) 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  l_grid                 !< geometric mean of grid sizes dx, dy, dz 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ptdf_x                 !< damping factor for potential temperature in x-direction 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ptdf_y                 !< damping factor for potential temperature in y-direction 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  pt_init                !< initial profile of potential temperature 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  q_init                 !< initial profile of specific humidity 
                                                                   !< (or total water content with active cloud physics) 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  rdf                    !< rayleigh damping factor for velocity components 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  rdf_sc                 !< rayleigh damping factor for scalar quantities 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ref_state              !< reference state of potential temperature 
                                                                   !< (and density in case of ocean simulation)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  s_init                 !< initial profile of passive scalar concentration
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  sa_init                !< initial profile of salinity (ocean)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ug                     !< geostrophic wind component in x-direction
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  u_init                 !< initial profile of horizontal velocity component u
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  vg                     !< geostrophic wind component in y-direction
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  v_init                 !< initial profile of horizontal velocity component v
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  w_subs                 !< subsidence/ascent velocity
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  zu                     !< vertical grid coordinate of u-grid (in m)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  zw                     !< vertical grid coordinate of w-grid (in m)

    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  c_u                   !< phase speed of u-velocity component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  c_v                   !< phase speed of v-velocity component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  c_w                   !< phase speed of w-velocity component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_e              !< artificial numerical dissipation flux at south face of grid box - subgrid-scale TKE
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_nc             !< artificial numerical dissipation flux at south face of grid box - clouddrop-number concentration    
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_nr             !< artificial numerical dissipation flux at south face of grid box - raindrop-number concentration    
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_pt             !< artificial numerical dissipation flux at south face of grid box - potential temperature 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_q              !< artificial numerical dissipation flux at south face of grid box - mixing ratio 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_qc             !< artificial numerical dissipation flux at south face of grid box - cloudwater 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_qr             !< artificial numerical dissipation flux at south face of grid box - rainwater 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_s              !< artificial numerical dissipation flux at south face of grid box - passive scalar
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_sa             !< artificial numerical dissipation flux at south face of grid box - salinity
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_u              !< artificial numerical dissipation flux at south face of grid box - u-component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_v              !< artificial numerical dissipation flux at south face of grid box - v-component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  diss_s_w              !< artificial numerical dissipation flux at south face of grid box - w-component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  dzu_mg                !< vertical grid size (u-grid) for multigrid pressure solver
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  dzw_mg                !< vertical grid size (w-grid) for multigrid pressure solver
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_e              !< 6th-order advective flux at south face of grid box - subgrid-scale TKE
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_nc             !< 6th-order advective flux at south face of grid box - clouddrop-number concentration 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_nr             !< 6th-order advective flux at south face of grid box - raindrop-number concentration 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_pt             !< 6th-order advective flux at south face of grid box - potential temperature 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_q              !< 6th-order advective flux at south face of grid box - mixing ratio 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_qc             !< 6th-order advective flux at south face of grid box - cloudwater
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_qr             !< 6th-order advective flux at south face of grid box - rainwater
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_s              !< 6th-order advective flux at south face of grid box - passive scalar
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_sa             !< 6th-order advective flux at south face of grid box - salinity
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_u              !< 6th-order advective flux at south face of grid box - u-component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_v              !< 6th-order advective flux at south face of grid box - v-component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  flux_s_w              !< 6th-order advective flux at south face of grid box - w-component
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  f1_mg                 !< grid factor used in right hand side of Gauss-Seidel equation (multigrid)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  f2_mg                 !< grid factor used in right hand side of Gauss-Seidel equation (multigrid)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  f3_mg                 !< grid factor used in right hand side of Gauss-Seidel equation (multigrid)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  mean_inflow_profiles  !< used for turbulent inflow (non-cyclic boundary conditions)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  precipitation_amount  !< precipitation amount due to gravitational settling (bulk microphysics)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  precipitation_rate    !< precipitation rate (bulk microphysics)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  pt_slope_ref          !< potential temperature in rotated coordinate system 
                                                                    !< (in case of sloped surface) 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  total_2d_a            !< horizontal array to store the total domain data, used for atmosphere-ocean coupling (atmosphere data)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  total_2d_o            !< horizontal array to store the total domain data, used for atmosphere-ocean coupling (ocean data)
    
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  d          !< divergence
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  de_dx      !< gradient of sgs tke in x-direction (lpm)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  de_dy      !< gradient of sgs tke in y-direction (lpm)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  de_dz      !< gradient of sgs tke in z-direction (lpm)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss       !< TKE dissipation rate
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_e   !< artificial numerical dissipation flux at left face of grid box - subgrid-scale TKE
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_nc  !< artificial numerical dissipation flux at left face of grid box - clouddrop-number concentration
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_nr  !< artificial numerical dissipation flux at left face of grid box - raindrop-number concentration
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_pt  !< artificial numerical dissipation flux at left face of grid box - potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_q   !< artificial numerical dissipation flux at left face of grid box - mixing ratio
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_qc  !< artificial numerical dissipation flux at left face of grid box - cloudwater
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_qr  !< artificial numerical dissipation flux at left face of grid box - rainwater
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_s   !< artificial numerical dissipation flux at left face of grid box - passive scalar
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_sa  !< artificial numerical dissipation flux at left face of grid box - salinity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_u   !< artificial numerical dissipation flux at left face of grid box - u-component
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_v   !< artificial numerical dissipation flux at left face of grid box - v-component
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  diss_l_w   !< artificial numerical dissipation flux at left face of grid box - w-component
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_e   !< 6th-order advective flux at south face of grid box - subgrid-scale TKE
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_nc  !< 6th-order advective flux at south face of grid box - clouddrop-number concentration
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_nr  !< 6th-order advective flux at south face of grid box - raindrop-number concentration
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_pt  !< 6th-order advective flux at south face of grid box - potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_q   !< 6th-order advective flux at south face of grid box - mixing ratio
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_qc  !< 6th-order advective flux at south face of grid box - cloudwater
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_qr  !< 6th-order advective flux at south face of grid box - rainwater
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_s   !< 6th-order advective flux at south face of grid box - passive scalar
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_sa  !< 6th-order advective flux at south face of grid box - salinity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_u   !< 6th-order advective flux at south face of grid box - u-component
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_v   !< 6th-order advective flux at south face of grid box - v-component
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  flux_l_w   !< 6th-order advective flux at south face of grid box - w-component
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  kh         !< eddy diffusivity for heat 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  km         !< eddy diffusivity for momentum
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  l_wall     !< near-wall mixing length
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  prr        !< rain rate
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  p_loc      !< local array in multigrid/sor solver containing the pressure which is iteratively advanced in each iteration step
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  tend       !< tendency field (time integration)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  tric       !< coefficients of the tridiagonal matrix for solution of the Poisson equation in Fourier space
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  u_m_l      !< velocity data (u at left boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  u_m_n      !< velocity data (u at north boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  u_m_r      !< velocity data (u at right boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  u_m_s      !< velocity data (u at south boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  v_m_l      !< velocity data (v at left boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  v_m_n      !< velocity data (v at north boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  v_m_r      !< velocity data (v at right boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  v_m_s      !< velocity data (v at south boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  w_m_l      !< velocity data (w at left boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  w_m_n      !< velocity data (w at north boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  w_m_r      !< velocity data (w at right boundary) from time level t-dt required for radiation boundary condition
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  w_m_s      !< velocity data (w at south boundary) from time level t-dt required for radiation boundary condition

#if defined( __nopointer )
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  e          !< subgrid-scale turbulence kinetic energy (sgs tke)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  e_p        !< prognostic value of sgs tke
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nc         !< cloud drop number density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nc_p       !< prognostic value of cloud drop number density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nr         !< rain drop number density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nr_p       !< prognostic value of rain drop number density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  p          !< perturbation pressure
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  prho       !< potential density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pt         !< potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pt_p       !< prognostic value of potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  q          !< specific humidity
                                                                   !< (or total water content with active cloud physics)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  q_p        !< prognostic value of specific humidity 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qc         !< cloud water content
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qc_p       !< cloud water content
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql         !< liquid water content
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_c       !< change in liquid water content due to 
                                                                   !< condensation/evaporation during last time step
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_v       !< volume of liquid water
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_vp      !< liquid water weighting factor
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qr         !< rain water content
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qr_p       !< prognostic value of rain water content 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  rho_ocean  !< density of ocean
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  s          !< passive scalar
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  s_p        !< prognostic value of passive scalar
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  sa         !< ocean salinity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  sa_p       !< prognostic value of ocean salinity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  te_m       !< weighted tendency of e for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tnc_m      !< weighted tendency of nc for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tnr_m      !< weighted tendency of nr for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tpt_m      !< weighted tendency of pt for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tq_m       !< weighted tendency of q for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tqc_m      !< weighted tendency of qc for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tqr_m      !< weighted tendency of qr for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ts_m       !< weighted tendency of s for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tsa_m      !< weighted tendency of sa for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tu_m       !< weighted tendency of u for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tv_m       !< weighted tendency of v for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  tw_m       !< weighted tendency of w for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  u          !< horizontal velocity component u (x-direction)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  u_p        !< prognostic value of u
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  v          !< horizontal velocity component v (y-direction)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  v_p        !< prognostic value of v
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  vpt        !< virtual potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  w          !< vertical velocity component w (z-direction)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  w_p        !< prognostic value of w
#else
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  e_1     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  e_2     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  e_3     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  p       !< pointer: perturbation pressure
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  prho_1  !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nc_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nc_2    !< pointer for swapping of timelevels for respective quantity 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nc_3    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nr_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nr_2    !< pointer for swapping of timelevels for respective quantity 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nr_3    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pt_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pt_2    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pt_3    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  q_1     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  q_2     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  q_3     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qc_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qc_2    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qc_3    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_v    !< pointer: volume of liquid water
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_vp   !< pointer: liquid water weighting factor
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_2    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qr_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qr_2    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qr_3    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  rho_1   !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  s_1     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  s_2     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  s_3     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  sa_1    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  sa_2    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  sa_3    !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  u_1     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  u_2     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  u_3     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  v_1     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  v_2     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  v_3     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  vpt_1   !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  w_1     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  w_2     !< pointer for swapping of timelevels for respective quantity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  w_3     !< pointer for swapping of timelevels for respective quantity

    REAL(wp), DIMENSION(:,:,:), POINTER ::  e          !< pointer: subgrid-scale turbulence kinetic energy (sgs tke)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  e_p        !< pointer: prognostic value of sgs tke
    REAL(wp), DIMENSION(:,:,:), POINTER ::  nc         !< pointer: cloud drop number density
    REAL(wp), DIMENSION(:,:,:), POINTER ::  nc_p       !< pointer: prognostic value of cloud drop number density
    REAL(wp), DIMENSION(:,:,:), POINTER ::  nr         !< pointer: rain drop number density
    REAL(wp), DIMENSION(:,:,:), POINTER ::  nr_p       !< pointer: prognostic value of rain drop number density
    REAL(wp), DIMENSION(:,:,:), POINTER ::  prho       !< pointer: potential density
    REAL(wp), DIMENSION(:,:,:), POINTER ::  pt         !< pointer: potential temperature
    REAL(wp), DIMENSION(:,:,:), POINTER ::  pt_p       !< pointer: prognostic value of potential temperature
    REAL(wp), DIMENSION(:,:,:), POINTER ::  q          !< pointer: specific humidity
    REAL(wp), DIMENSION(:,:,:), POINTER ::  q_p        !< pointer: prognostic value of specific humidity
    REAL(wp), DIMENSION(:,:,:), POINTER ::  qc         !< pointer: cloud water content
    REAL(wp), DIMENSION(:,:,:), POINTER ::  qc_p       !< pointer: cloud water content
    REAL(wp), DIMENSION(:,:,:), POINTER ::  ql         !< pointer: liquid water content
    REAL(wp), DIMENSION(:,:,:), POINTER ::  ql_c       !< pointer: change in liquid water content due to 
                                                       !< condensation/evaporation during last time step
    REAL(wp), DIMENSION(:,:,:), POINTER ::  qr         !< pointer: rain water content
    REAL(wp), DIMENSION(:,:,:), POINTER ::  qr_p       !< pointer: prognostic value of rain water content
    REAL(wp), DIMENSION(:,:,:), POINTER ::  rho_ocean  !< pointer: density of ocean
    REAL(wp), DIMENSION(:,:,:), POINTER ::  s          !< pointer: passive scalar
    REAL(wp), DIMENSION(:,:,:), POINTER ::  s_p        !< pointer: prognostic value of passive scalar
    REAL(wp), DIMENSION(:,:,:), POINTER ::  sa         !< pointer: ocean salinity
    REAL(wp), DIMENSION(:,:,:), POINTER ::  sa_p       !< pointer: prognostic value of ocean salinity
    REAL(wp), DIMENSION(:,:,:), POINTER ::  te_m       !< pointer: weighted tendency of e for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tnc_m      !< pointer: weighted tendency of nc for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tnr_m      !< pointer: weighted tendency of nr for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tpt_m      !< pointer: weighted tendency of pt for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tq_m       !< pointer: weighted tendency of q for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tqc_m      !< pointer: weighted tendency of qc for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tqr_m      !< pointer: weighted tendency of qr for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  ts_m       !< pointer: weighted tendency of s for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tsa_m      !< pointer: weighted tendency of sa for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tu_m       !< pointer: weighted tendency of u for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tv_m       !< pointer: weighted tendency of v for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  tw_m       !< pointer: weighted tendency of w for previous sub-timestep (Runge-Kutta)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  u          !< pointer: horizontal velocity component u (x-direction)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  u_p        !< pointer: prognostic value of u
    REAL(wp), DIMENSION(:,:,:), POINTER ::  v          !< pointer: horizontal velocity component v (y-direction)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  v_p        !< pointer: prognostic value of v
    REAL(wp), DIMENSION(:,:,:), POINTER ::  vpt        !< pointer: virtual potential temperature
    REAL(wp), DIMENSION(:,:,:), POINTER ::  w          !< pointer: vertical velocity component w (z-direction)
    REAL(wp), DIMENSION(:,:,:), POINTER ::  w_p        !< pointer: prognostic value of w
#endif

    REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE ::  tri    !<  array to hold the tridiagonal matrix for solution of the Poisson equation in Fourier space (4th dimension for threads)

    REAL(wp), DIMENSION(:), ALLOCATABLE ::  rho_air      !< air density profile on the uv grid
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  rho_air_zw   !< air density profile on the w grid
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  drho_air     !< inverse air density profile on the uv grid
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  drho_air_zw  !< inverse air density profile on the w grid

    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  rho_air_mg     !< air density profiles on the uv grid for multigrid
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  rho_air_zw_mg  !< air density profiles on the w grid for multigrid

    REAL(wp), DIMENSION(:), ALLOCATABLE ::  heatflux_input_conversion       !< conversion factor array for heatflux input
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  waterflux_input_conversion      !< conversion factor array for waterflux input
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  momentumflux_input_conversion   !< conversion factor array for momentumflux input
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  heatflux_output_conversion      !< conversion factor array for heatflux output
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  waterflux_output_conversion     !< conversion factor array for waterflux output
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  momentumflux_output_conversion  !< conversion factor array for momentumflux output

    SAVE

 END MODULE arrays_3d


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables needed for time-averaging of 2d/3d data.
!------------------------------------------------------------------------------!
 MODULE averaging
 
    USE kinds

    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  lwp_av                 !< avg. liquid water path
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  precipitation_rate_av  !< avg. precipitation rate
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  ol_av                  !< avg. Obukhov length
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  qsws_av                !< avg. surface moisture flux
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  ssws_av                !< avg. surface scalar flux
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  shf_av                 !< avg. surface heat flux
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  ts_av                  !< avg. characteristic temperature scale
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  us_av                  !< avg. friction velocity
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  z0_av                  !< avg. roughness length for momentum
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  z0h_av                 !< avg. roughness length for heat
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  z0q_av                 !< avg. roughness length for moisture

    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  e_av          !< avg. subgrid-scale tke
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  lpt_av        !< avg. liquid water potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nc_av         !< avg. cloud drop number density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  nr_av         !< avg. rain drop number density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  p_av          !< avg. perturbation pressure
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pc_av         !< avg. particle/droplet concentration
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pr_av         !< avg. particle/droplet radius
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  prr_av        !< avg. precipitation rate
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  pt_av         !< avg. potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  q_av          !< avg. specific humidity
                                                                      !< (or total water content with active cloud physics)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qc_av         !< avg. cloud water content
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_av         !< avg. liquid water content 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_c_av       !< avg. change in liquid water content due to 
                                                                      !< condensation/evaporation during last time step
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_v_av       !< avg. volume of liquid water
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  ql_vp_av      !< avg. liquid water weighting factor
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qr_av         !< avg. rain water content
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  qv_av         !< avg. water vapor content (specific humidity)
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  rho_ocean_av  !< avg. ocean density
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  s_av          !< avg. passive scalar
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  sa_av         !< avg. salinity
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  u_av          !< avg. horizontal velocity component u 
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  v_av          !< avg. horizontal velocity component v
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  vpt_av        !< avg. virtual potential temperature
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET ::  w_av          !< avg. vertical velocity component
  
 END MODULE averaging


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables and constants for cloud physics.
!------------------------------------------------------------------------------!
 MODULE cloud_parameters
 
    USE kinds

    REAL(wp) ::  cp = 1005.0_wp         !< heat capacity of dry air (J kg-1 K-1)
    REAL(wp) ::  l_v = 2.5E+06_wp       !< latent heat of vaporization (J kg-1)
    REAL(wp) ::  l_d_cp                 !< l_v / cp
    REAL(wp) ::  l_d_r                  !< l_v / r_d
    REAL(wp) ::  l_d_rv                 !< l_v / r_v    
    REAL(wp) ::  rho_l = 1.0E3_wp       !< density of water (kg m-3)
    REAL(wp) ::  r_d = 287.0_wp         !< sp. gas const. dry air (J kg-1 K-1)
    REAL(wp) ::  r_v = 461.51_wp        !< sp. gas const. water vapor (J kg-1 K-1)


    REAL(wp), DIMENSION(:), ALLOCATABLE ::  hyrho   !< density of air calculated with hydrostatic pressure 
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  pt_d_t  !< ratio of potential and actual temperature
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  t_d_pt  !< ratio of actual and potential temperature

    SAVE

 END MODULE cloud_parameters


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of general constants.
!------------------------------------------------------------------------------!
 MODULE constants
 
    USE kinds

    REAL(wp) ::  pi = 3.141592654_wp  !< PI
    REAL(wp) ::  adv_mom_1            !< 1/4 - constant used in 5th-order advection scheme for momentum advection (1st-order part)
    REAL(wp) ::  adv_mom_3            !< 1/24 - constant used in 5th-order advection scheme for momentum advection (3rd-order part)
    REAL(wp) ::  adv_mom_5            !< 1/120 - constant used in 5th-order advection scheme for momentum advection (5th-order part)
    REAL(wp) ::  adv_sca_1            !< 1/2 - constant used in 5th-order advection scheme for scalar advection (1st-order part)
    REAL(wp) ::  adv_sca_3            !< 1/12 - constant used in 5th-order advection scheme for scalar advection (3rd-order part)
    REAL(wp) ::  adv_sca_5            !< 1/60 - constant used in 5th-order advection scheme for scalar advection (5th-order part)
    
    SAVE

 END MODULE constants

 
!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of parameters for program control
!------------------------------------------------------------------------------!
 MODULE control_parameters

    USE kinds

    TYPE file_status
       LOGICAL ::  opened         !< file is currently open
       LOGICAL ::  opened_before  !< file is currently closed, but has been openend before
    END TYPE file_status
    
    INTEGER, PARAMETER      ::  mask_xyz_dimension = 100  !< limit of mask dimensions (100 points in each direction)
    INTEGER, PARAMETER      ::  max_masks = 50            !< maximum number of masks
    INTEGER(iwp), PARAMETER ::  varnamelength = 30        !< length of output variable names

    TYPE(file_status), DIMENSION(200+2*max_masks) ::                &  !< indicates if file is open or if it has been opened before
                             openfile = file_status(.FALSE.,.FALSE.)

    CHARACTER (LEN=1)    ::  cycle_mg = 'w'                               !< namelist parameter (see documentation)
    CHARACTER (LEN=1)    ::  timestep_reason = ' '                        !< 'A'dvection or 'D'iffusion criterion, written to RUN_CONTROL file
    CHARACTER (LEN=3)    ::  coupling_char = ''                           !< appended to filenames in coupled ocean-atmosphere runs ('_O': ocean PE, '_A': atmosphere PE)
    CHARACTER (LEN=8)    ::  most_method = 'newton'                       !< namelist parameter
    CHARACTER (LEN=8)    ::  run_date                                     !< date of simulation run, printed to HEADER file
    CHARACTER (LEN=8)    ::  run_time                                     !< time of simulation run, printed to HEADER file
    CHARACTER (LEN=9)    ::  simulated_time_chr                           !< simulated time, printed to RUN_CONTROL file
    CHARACTER (LEN=11)   ::  topography_grid_convention = ' '             !< namelist parameter
    CHARACTER (LEN=12)   ::  version = ' '                                !< PALM version number
    CHARACTER (LEN=12)   ::  revision = ' '                               !< PALM revision number
    CHARACTER (LEN=12)   ::  user_interface_current_revision = ' '        !< revision number of the currently used user-interface (must match user_interface_required_revision)
    CHARACTER (LEN=12)   ::  user_interface_required_revision = ' '       !< required user-interface revision number
    CHARACTER (LEN=16)   ::  conserve_volume_flow_mode = 'default'        !< namelist parameter
    CHARACTER (LEN=16)   ::  loop_optimization = 'cache'                  !< namelist parameter
    CHARACTER (LEN=16)   ::  momentum_advec = 'ws-scheme'                 !< namelist parameter
    CHARACTER (LEN=16)   ::  psolver = 'poisfft'                          !< namelist parameter
    CHARACTER (LEN=16)   ::  scalar_advec = 'ws-scheme'                   !< namelist parameter
    CHARACTER (LEN=20)   ::  approximation = 'boussinesq'                 !< namelist parameter
    CHARACTER (LEN=40)   ::  flux_input_mode = 'approximation-specific'   !< type of flux input: dynamic or kinematic
    CHARACTER (LEN=40)   ::  flux_output_mode = 'approximation-specific'  !< type of flux output: dynamic or kinematic
    CHARACTER (LEN=20)   ::  bc_e_b = 'neumann'                           !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_lr = 'cyclic'                             !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_ns = 'cyclic'                             !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_p_b = 'neumann'                           !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_p_t = 'dirichlet'                         !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_pt_b = 'dirichlet'                        !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_pt_t = 'initial_gradient'                 !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_q_b = 'dirichlet'                         !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_q_t = 'neumann'                           !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_s_b = 'dirichlet'                         !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_s_t = 'initial_gradient'                  !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_sa_t = 'neumann'                          !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_uv_b = 'dirichlet'                        !< namelist parameter
    CHARACTER (LEN=20)   ::  bc_uv_t = 'dirichlet'                        !< namelist parameter
    CHARACTER (LEN=20)   ::  cloud_scheme = 'saturation_adjust'           !< namelist parameter
    CHARACTER (LEN=20)   ::  coupling_mode = 'uncoupled'                  !< coupling mode for atmosphere-ocean coupling  
    CHARACTER (LEN=20)   ::  coupling_mode_remote = 'uncoupled'           !< coupling mode of the remote process in case of coupled atmosphere-ocean runs
    CHARACTER (LEN=20)   ::  dissipation_1d = 'detering'                  !< namelist parameter
    CHARACTER (LEN=20)   ::  fft_method = 'system-specific'               !< namelist parameter
    CHARACTER (LEN=20)   ::  mixing_length_1d = 'blackadar'               !< namelist parameter
    CHARACTER (LEN=20)   ::  random_generator = 'random-parallel'         !< namelist parameter
    CHARACTER (LEN=20)   ::  reference_state = 'initial_profile'          !< namelist parameter  
    CHARACTER (LEN=20)   ::  timestep_scheme = 'runge-kutta-3'            !< namelist parameter       
    CHARACTER (LEN=40)   ::  topography = 'flat'                          !< namelist parameter 
    CHARACTER (LEN=64)   ::  host = '????'                                !< hostname on which PALM is running, ENVPAR namelist parameter provided by mrun
    CHARACTER (LEN=80)   ::  log_message                                  !< user-defined message for debugging (sse data_log.f90)
    CHARACTER (LEN=80)   ::  run_identifier                               !< run identifier as given by mrun option -d, ENVPAR namelist parameter provided by mrun
    CHARACTER (LEN=100)  ::  initializing_actions = ' '                   !< namelist parameter
    CHARACTER (LEN=210)  ::  run_description_header                       !< string containing diverse run informations as run identifier, coupling mode, host, ensemble number, run date and time
    CHARACTER (LEN=1000) ::  message_string = ' '                         !< dynamic string for error message output

    CHARACTER (LEN=varnamelength), DIMENSION(500) ::  data_output = ' '       !< namelist parameter
    CHARACTER (LEN=varnamelength), DIMENSION(500) ::  data_output_user = ' '  !< namelist parameter
    CHARACTER (LEN=varnamelength), DIMENSION(500) ::  doav = ' '              !< label array for multi-dimensional, 
                                                                              !< averaged output quantities
                                            
    CHARACTER (LEN=varnamelength), DIMENSION(max_masks,100) ::  data_output_masks = ' '       !< namelist parameter
    CHARACTER (LEN=varnamelength), DIMENSION(max_masks,100) ::  data_output_masks_user = ' '  !< namelist parameter

    CHARACTER (LEN=varnamelength), DIMENSION(300) ::  data_output_pr = ' '  !< namelist parameter
    
    CHARACTER (LEN=varnamelength), DIMENSION(200) ::  data_output_pr_user = ' '  !< namelist parameter
    
    CHARACTER (LEN=varnamelength), DIMENSION(max_masks,0:1,100) ::  domask = ' ' !< label array for multi-dimensional, 
                                                                                 !< masked output quantities
    
    CHARACTER (LEN=varnamelength), DIMENSION(0:1,500) ::  do2d = ' '  !< label array for 2d output quantities
    CHARACTER (LEN=varnamelength), DIMENSION(0:1,500) ::  do3d = ' '  !< label array for 3d output quantities

    INTEGER(iwp), PARAMETER ::  fl_max = 100     !< maximum number of virtual-flight measurements
    INTEGER(iwp), PARAMETER ::  var_fl_max = 20  !< maximum number of different sampling variables in virtual flight measurements
    
    INTEGER(iwp) ::  abort_mode = 1                    !< abort condition (nested runs)
    INTEGER(iwp) ::  average_count_pr = 0              !< number of samples in vertical-profile output
    INTEGER(iwp) ::  average_count_3d = 0              !< number of samples in 3d output
    INTEGER(iwp) ::  current_timestep_number = 0       !< current timestep number, printed to RUN_CONTROL file
    INTEGER(iwp) ::  coupling_topology = 0             !< switch for atmosphere-ocean-coupling: 0: same number of grid points and PEs along x and y in atmosphere and ocean, otherwise 1
    INTEGER(iwp) ::  dist_range = 0                    !< switch for steering the horizontal disturbance range, 1: inflow disturbances in case of non-cyclic horizontal BC, 0: otherwise
    INTEGER(iwp) ::  disturbance_level_ind_b           !< lowest grid index where flow disturbance is applied
    INTEGER(iwp) ::  disturbance_level_ind_t           !< highest grid index where flow disturbance is applied
    INTEGER(iwp) ::  doav_n = 0                        !< number of 2d/3d output quantities subject to time averaging
    INTEGER(iwp) ::  dopr_n = 0                        !< number of profile output quantities subject to time averaging
    INTEGER(iwp) ::  dopr_time_count = 0               !< number of output intervals for profile output
    INTEGER(iwp) ::  dopts_time_count = 0              !< number of output intervals for particle data timeseries
    INTEGER(iwp) ::  dots_time_count = 0               !< number of output intervals for timeseries output
    INTEGER(iwp) ::  dp_level_ind_b = 0                !< lowest grid index for external pressure gradient forcing
    INTEGER(iwp) ::  dvrp_filecount = 0                !< parameter for dvr visualization software
    INTEGER(iwp) ::  dz_stretch_level_index            !< vertical grid level index above which the vertical grid spacing is stretched
    INTEGER(iwp) ::  ensemble_member_nr = 0            !< namelist parameter
    INTEGER(iwp) ::  gamma_mg                          !< switch for steering the multigrid cycle: 1: v-cycle, 2: w-cycle
    INTEGER(iwp) ::  gathered_size                     !< number of total domain grid points of the grid level which is gathered on PE0 (multigrid solver)
    INTEGER(iwp) ::  grid_level                        !< current grid level handled in the multigrid solver
    INTEGER(iwp) ::  ibc_e_b                           !< integer flag for bc_e_b
    INTEGER(iwp) ::  ibc_p_b                           !< integer flag for bc_p_b
    INTEGER(iwp) ::  ibc_p_t                           !< integer flag for bc_p_t
    INTEGER(iwp) ::  ibc_pt_b                          !< integer flag for bc_pt_b
    INTEGER(iwp) ::  ibc_pt_t                          !< integer flag for bc_pt_t
    INTEGER(iwp) ::  ibc_q_b                           !< integer flag for bc_q_b
    INTEGER(iwp) ::  ibc_q_t                           !< integer flag for bc_q_t
    INTEGER(iwp) ::  ibc_s_b                           !< integer flag for bc_s_b
    INTEGER(iwp) ::  ibc_s_t                           !< integer flag for bc_s_t
    INTEGER(iwp) ::  ibc_sa_t                          !< integer flag for bc_sa_t
    INTEGER(iwp) ::  ibc_uv_b                          !< integer flag for bc_uv_b
    INTEGER(iwp) ::  ibc_uv_t                          !< integer flag for bc_uv_t
    INTEGER(iwp) ::  inflow_disturbance_begin = -1     !< namelist parameter
    INTEGER(iwp) ::  inflow_disturbance_end = -1       !< namelist parameter
    INTEGER(iwp) ::  intermediate_timestep_count       !< number of current Runge-Kutta substep
    INTEGER(iwp) ::  intermediate_timestep_count_max   !< maximum number of Runge-Kutta substeps
    INTEGER(iwp) ::  io_group = 0                      !< I/O group to which the PE belongs (= #PE / io_blocks)
    INTEGER(iwp) ::  io_blocks = 1                     !< number of blocks for which I/O is done in sequence (total number of PEs / maximum_parallel_io_streams)
    INTEGER(iwp) ::  iran = -1234567                   !< integer random number used for flow disturbances
    INTEGER(iwp) ::  lod = 1                           !< level of detail, topography input parameter 
    INTEGER(iwp) ::  masks = 0                         !< counter for number of masked output quantities
    INTEGER(iwp) ::  maximum_grid_level                !< number of grid levels that the multigrid solver is using
    INTEGER(iwp) ::  maximum_parallel_io_streams = -1  !< maximum number of parallel io streams that the underlying parallel file system allows, set with mrun option -w, ENVPAR namelist parameter, provided by mrun
    INTEGER(iwp) ::  max_pr_user = 0                   !< number of user-defined profiles (must not change within a job chain)
    INTEGER(iwp) ::  mgcycles = 0                      !< number of multigrid cycles that the multigrid solver has actually carried out
    INTEGER(iwp) ::  mg_cycles = -1                    !< namelist parameter
    INTEGER(iwp) ::  mg_switch_to_pe0_level = -1       !< namelist parameter
    INTEGER(iwp) ::  mid                               !< masked output running index
    INTEGER(iwp) ::  ngsrb = 2                         !< namelist parameter
    INTEGER(iwp) ::  nr_timesteps_this_run = 0         !< number of timesteps (cpu time measurements)
    INTEGER(iwp) ::  nsor = 20                         !< namelist parameter
    INTEGER(iwp) ::  nsor_ini = 100                    !< namelist parameter
    INTEGER(iwp) ::  n_sor                             !< number of iterations to be used in SOR-scheme
    INTEGER(iwp) ::  normalizing_region = 0            !< namelist parameter
    INTEGER(iwp) ::  num_leg=0                         !< number of different legs in virtual flight measurements
    INTEGER(iwp) ::  num_var_fl                        !< number of sampling/output variables in virtual flight measurements
    INTEGER(iwp) ::  num_var_fl_user=0                 !< number of user-defined sampling/output variables in virtual flight measurements
    INTEGER(iwp) ::  nz_do3d = -9999                   !< namelist parameter
    INTEGER(iwp) ::  prt_time_count = 0                !< number of output intervals for particle data output
    INTEGER(iwp) ::  recycling_plane                   !< position of recycling plane along x (in grid points) in case of turbulence recycling
    INTEGER(iwp) ::  runnr = 0                         !< number of run in job chain
    INTEGER(iwp) ::  subdomain_size                    !< number of grid points in (3d) subdomain including ghost points
    INTEGER(iwp) ::  terminate_coupled = 0             !< switch for steering termination in case of coupled runs
    INTEGER(iwp) ::  terminate_coupled_remote = 0      !< switch for steering termination in case of coupled runs (condition of the remote model)
    INTEGER(iwp) ::  timestep_count = 0                !< number of timesteps carried out since the beginning of the initial run
    INTEGER(iwp) ::  dist_nxl(0:1)                               !< left boundary of disturbance region
    INTEGER(iwp) ::  dist_nxr(0:1)                               !< right boundary of disturbance region
    INTEGER(iwp) ::  dist_nyn(0:1)                               !< north boundary of disturbance region
    INTEGER(iwp) ::  dist_nys(0:1)                               !< south boundary of disturbance region
    INTEGER(iwp) ::  do2d_no(0:1) = 0                            !< number of 2d output quantities
    INTEGER(iwp) ::  do2d_xy_time_count(0:1)                     !< number of output intervals for 2d data (xy)
    INTEGER(iwp) ::  do2d_xz_time_count(0:1)                     !< number of output intervals for 2d data (xz)
    INTEGER(iwp) ::  do2d_yz_time_count(0:1)                     !< number of output intervals for 2d data (yz)
    INTEGER(iwp) ::  do3d_no(0:1) = 0                            !< number of 3d output quantities
    INTEGER(iwp) ::  do3d_time_count(0:1)                        !< number of output intervals for 3d data
    INTEGER(iwp) ::  domask_no(max_masks,0:1) = 0                !< number of masked output quantities
    INTEGER(iwp) ::  domask_time_count(max_masks,0:1)            !< number of output intervals for masked data
    INTEGER(iwp) ::  mask_size(max_masks,3) = -1                 !< size of mask array per mask and dimension (for netcdf output)
    INTEGER(iwp) ::  mask_size_l(max_masks,3) = -1               !< subdomain size of mask array per mask and dimension (for netcdf output)
    INTEGER(iwp) ::  mask_start_l(max_masks,3) = -1              !< subdomain start index of mask array (for netcdf output)
    INTEGER(iwp) ::  pt_vertical_gradient_level_ind(10) = -9999  !< grid index values of pt_vertical_gradient_level(s)
    INTEGER(iwp) ::  q_vertical_gradient_level_ind(10) = -9999   !< grid index values of q_vertical_gradient_level(s)
    INTEGER(iwp) ::  s_vertical_gradient_level_ind(10) = -9999   !< grid index values of s_vertical_gradient_level(s)   
    INTEGER(iwp) ::  sa_vertical_gradient_level_ind(10) = -9999  !< grid index values of sa_vertical_gradient_level(s)
    INTEGER(iwp) ::  section(100,3)                              !< collective array for section_xy/xz/yz
    INTEGER(iwp) ::  section_xy(100) = -9999                     !< namelist parameter
    INTEGER(iwp) ::  section_xz(100) = -9999                     !< namelist parameter
    INTEGER(iwp) ::  section_yz(100) = -9999                     !< namelist parameter
    INTEGER(iwp) ::  ug_vertical_gradient_level_ind(10) = -9999  !< grid index values of ug_vertical_gradient_level(s)
    INTEGER(iwp) ::  vg_vertical_gradient_level_ind(10) = -9999  !< grid index values of vg_vertical_gradient_level(s)
    INTEGER(iwp) ::  subs_vertical_gradient_level_i(10) = -9999  !< grid index values of subs_vertical_gradient_level(s)

    INTEGER(iwp), DIMENSION(0:1) ::  ntdim_2d_xy  !< number of output intervals for 2d data (xy)
    INTEGER(iwp), DIMENSION(0:1) ::  ntdim_2d_xz  !< number of output intervals for 2d data (xz)
    INTEGER(iwp), DIMENSION(0:1) ::  ntdim_2d_yz  !< number of output intervals for 2d data (yz)
    INTEGER(iwp), DIMENSION(0:1) ::  ntdim_3d     !< number of output intervals for 3d data

    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  grid_level_count  !< internal switch for steering the multigrid v- and w-cycles

    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mask_i         !< subdomain grid index of masked output point on x-dimension
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mask_j         !< subdomain grid index of masked output point on y-dimension
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mask_k         !< subdomain grid index of masked output point on z-dimension
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mask_i_global  !< global grid index of masked output point on x-dimension
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mask_j_global  !< global grid index of masked output point on y-dimension
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mask_k_global  !< global grid index of masked output point on z-dimension

    LOGICAL ::  bc_lr_cyc =.TRUE.                            !< left-right boundary condition cyclic?
    LOGICAL ::  bc_lr_dirrad = .FALSE.                       !< left-right boundary condition dirichlet/radiation?
    LOGICAL ::  bc_lr_raddir = .FALSE.                       !< left-right boundary condition radiation/dirichlet?
    LOGICAL ::  bc_ns_cyc = .TRUE.                           !< north-south boundary condition cyclic?
    LOGICAL ::  bc_ns_dirrad = .FALSE.                       !< north-south boundary condition dirichlet/radiation?
    LOGICAL ::  bc_ns_raddir = .FALSE.                       !< north-south boundary condition radiation/dirichlet?
    LOGICAL ::  call_microphysics_at_all_substeps = .FALSE.  !< namelist parameter
    LOGICAL ::  call_psolver_at_all_substeps = .TRUE.        !< namelist parameter
    LOGICAL ::  cloud_droplets = .FALSE.                     !< namelist parameter
    LOGICAL ::  cloud_physics = .FALSE.                      !< namelist parameter
    LOGICAL ::  cloud_top_radiation = .FALSE.                !< namelist parameter
    LOGICAL ::  conserve_volume_flow = .FALSE.               !< namelist parameter
    LOGICAL ::  constant_diffusion = .FALSE.                 !< diffusion coefficient constant?
    LOGICAL ::  constant_flux_layer = .TRUE.                 !< namelist parameter
    LOGICAL ::  constant_heatflux = .TRUE.                   !< heat flux at all surfaces constant?
    LOGICAL ::  constant_top_heatflux = .TRUE.               !< heat flux at domain top constant?
    LOGICAL ::  constant_top_momentumflux = .FALSE.          !< momentum flux at domain topconstant?
    LOGICAL ::  constant_top_salinityflux = .TRUE.           !< salinity flux at ocean domain top?
    LOGICAL ::  constant_top_scalarflux = .TRUE.             !< passive-scalar flux at domain top constant?
    LOGICAL ::  constant_scalarflux = .TRUE.                 !< passive-scalar flux at surfaces constant?
    LOGICAL ::  constant_waterflux = .TRUE.                  !< water flux at all surfaces constant?
    LOGICAL ::  create_disturbances = .TRUE.                 !< namelist parameter
    LOGICAL ::  data_output_during_spinup = .FALSE.          !< namelist parameter
    LOGICAL ::  data_output_2d_on_each_pe = .TRUE.           !< namelist parameter
    LOGICAL ::  disturbance_created = .FALSE.                !< flow disturbance imposed?
    LOGICAL ::  do2d_at_begin = .FALSE.                      !< namelist parameter
    LOGICAL ::  do3d_at_begin = .FALSE.                      !< namelist parameter
    LOGICAL ::  do_sum = .FALSE.                             !< contribute to time average of profile data?
    LOGICAL ::  dp_external = .FALSE.                        !< namelist parameter
    LOGICAL ::  dp_smooth = .FALSE.                          !< namelist parameter
    LOGICAL ::  dt_fixed = .FALSE.                           !< fixed timestep (namelist parameter dt set)?
    LOGICAL ::  dt_3d_reached                                !< internal timestep for particle advection
    LOGICAL ::  dt_3d_reached_l                              !< internal timestep for particle advection
    LOGICAL ::  first_call_lpm = .TRUE.                      !< call lpm only once per timestep?
    LOGICAL ::  force_print_header = .FALSE.                 !< namelist parameter
    LOGICAL ::  galilei_transformation = .FALSE.             !< namelist parameter
    LOGICAL ::  humidity = .FALSE.                           !< namelist parameter
    LOGICAL ::  humidity_remote = .FALSE.                    !< switch for receiving near-surface humidity flux (atmosphere-ocean coupling)
    LOGICAL ::  inflow_l = .FALSE.                           !< left domain boundary has non-cyclic inflow?
    LOGICAL ::  inflow_n = .FALSE.                           !< north domain boundary has non-cyclic inflow?
    LOGICAL ::  inflow_r = .FALSE.                           !< right domain boundary has non-cyclic inflow?
    LOGICAL ::  inflow_s = .FALSE.                           !< south domain boundary has non-cyclic inflow?
    LOGICAL ::  large_scale_forcing = .FALSE.                !< namelist parameter
    LOGICAL ::  large_scale_subsidence = .FALSE.             !< namelist parameter
    LOGICAL ::  land_surface = .FALSE.                       !< use land surface model?
    LOGICAL ::  lsf_exception = .FALSE.                      !< use of lsf with buildings (temporary)?
    LOGICAL ::  lsf_surf = .TRUE.                            !< use surface forcing (large scale forcing)?
    LOGICAL ::  lsf_vert = .TRUE.                            !< use atmospheric forcing (large scale forcing)?
    LOGICAL ::  masking_method = .FALSE.                     !< namelist parameter
    LOGICAL ::  microphysics_sat_adjust = .FALSE.            !< use saturation adjust bulk scheme?
    LOGICAL ::  microphysics_kessler = .FALSE.               !< use kessler bulk scheme?
    LOGICAL ::  microphysics_morrison = .FALSE.              !< use 2-moment Morrison (add. prog. eq. for nc and qc)
    LOGICAL ::  microphysics_seifert = .FALSE.               !< use 2-moment Seifert and Beheng scheme
    LOGICAL ::  mg_switch_to_pe0 = .FALSE.                   !< internal multigrid switch for steering the ghost point exchange in case that data has been collected on PE0
    LOGICAL ::  nest_bound_l = .FALSE.                       !< nested boundary on left side?
    LOGICAL ::  nest_bound_n = .FALSE.                       !< nested boundary on north side?
    LOGICAL ::  nest_bound_r = .FALSE.                       !< nested boundary on right side?
    LOGICAL ::  nest_bound_s = .FALSE.                       !< nested boundary on south side?
    LOGICAL ::  nest_domain  = .FALSE.                       !< domain is nested into a parent domain?
    LOGICAL ::  neutral = .FALSE.                            !< namelist parameter
    LOGICAL ::  nudging = .FALSE.                            !< namelist parameter
    LOGICAL ::  ocean = .FALSE.                              !< namelist parameter
    LOGICAL ::  outflow_l = .FALSE.                          !< left domain boundary has non-cyclic outflow?
    LOGICAL ::  outflow_n = .FALSE.                          !< north domain boundary has non-cyclic outflow?
    LOGICAL ::  outflow_r = .FALSE.                          !< right domain boundary has non-cyclic outflow?
    LOGICAL ::  outflow_s = .FALSE.                          !< south domain boundary has non-cyclic outflow?
    LOGICAL ::  passive_scalar = .FALSE.                     !< namelist parameter
    LOGICAL ::  precipitation = .FALSE.                      !< namelist parameter
    LOGICAL ::  random_heatflux = .FALSE.                    !< namelist parameter
    LOGICAL ::  recycling_yshift = .FALSE.                   !< namelist parameter
    LOGICAL ::  run_control_header = .FALSE.                 !< onetime output of RUN_CONTROL header
    LOGICAL ::  run_coupled = .TRUE.                         !< internal switch telling PALM to run in coupled mode (i.e. to exchange surface data) in case of atmosphere-ocean coupling
    LOGICAL ::  scalar_rayleigh_damping = .TRUE.             !< namelist parameter
    LOGICAL ::  sloping_surface = .FALSE.                    !< use sloped surface? (namelist parameter alpha_surface)
    LOGICAL ::  spinup = .FALSE.                             !< perform model spinup without atmosphere code?
    LOGICAL ::  stop_dt = .FALSE.                            !< internal switch to stop the time stepping
    LOGICAL ::  synchronous_exchange = .FALSE.               !< namelist parameter
    LOGICAL ::  synthetic_turbulence_generator = .FALSE.     !< flag for synthetic turbulence generator module
    LOGICAL ::  terminate_run = .FALSE.                      !< terminate run (cpu-time limit, restarts)?
    LOGICAL ::  transpose_compute_overlap = .FALSE.          !< namelist parameter
    LOGICAL ::  turbulent_inflow = .FALSE.                   !< namelist parameter
    LOGICAL ::  turbulent_outflow = .FALSE.                  !< namelist parameter
    LOGICAL ::  urban_surface = .FALSE.                      !< use urban surface model?
    LOGICAL ::  use_cmax = .TRUE.                            !< namelist parameter
    LOGICAL ::  use_initial_profile_as_reference = .FALSE.   !< use of initial profiles as reference state?
    LOGICAL ::  use_prescribed_profile_data = .FALSE.        !< use of prescribed wind profiles?
                                                             !< (namelist parameters u_profile, v_profile)
    LOGICAL ::  use_single_reference_value = .FALSE.         !< use of single value as reference state?
    LOGICAL ::  use_subsidence_tendencies = .FALSE.          !< namelist parameter
    LOGICAL ::  use_surface_fluxes = .FALSE.                 !< namelist parameter
    LOGICAL ::  use_top_fluxes = .FALSE.                     !< namelist parameter
    LOGICAL ::  use_ug_for_galilei_tr = .TRUE.               !< namelist parameter
    LOGICAL ::  use_upstream_for_tke = .FALSE.               !< namelist parameter
    LOGICAL ::  virtual_flight = .FALSE.                     !< use virtual flight model?
    LOGICAL ::  wall_adjustment = .TRUE.                     !< namelist parameter
    LOGICAL ::  write_binary = .FALSE.                       !< ENVPAR namelist parameter to steer restart I/O (ENVPAR is created by mrun)
    LOGICAL ::  ws_scheme_sca = .FALSE.                      !< use Wicker-Skamarock scheme (scalar advection)?
    LOGICAL ::  ws_scheme_mom = .FALSE.                      !< use Wicker-Skamarock scheme (momentum advection)?

    LOGICAL ::  data_output_xy(0:1) = .FALSE.                !< output of xy cross-section data?
    LOGICAL ::  data_output_xz(0:1) = .FALSE.                !< output of xz cross-section data?
    LOGICAL ::  data_output_yz(0:1) = .FALSE.                !< output of yz cross-section data?

    REAL(wp) ::  advected_distance_x = 0.0_wp                  !< advected distance of model domain along x 
                                                               !< (galilei transformation) 
    REAL(wp) ::  advected_distance_y = 0.0_wp                  !< advected distance of model domain along y 
                                                               !< (galilei transformation)
    REAL(wp) ::  alpha_surface = 0.0_wp                        !< namelist parameter
    REAL(wp) ::  atmos_ocean_sign = 1.0_wp                     !< vertical-grid conversion factor 
                                                               !< (=1.0 in atmosphere, =-1.0 in ocean)
    REAL(wp) ::  averaging_interval = 0.0_wp                   !< namelist parameter
    REAL(wp) ::  averaging_interval_pr = 9999999.9_wp          !< namelist parameter
    REAL(wp) ::  bc_pt_t_val                                   !< vertical gradient of pt near domain top
    REAL(wp) ::  bc_q_t_val                                    !< vertical gradient of humidity near domain top
    REAL(wp) ::  bc_s_t_val                                    !< vertical gradient of passive scalar near domain top
    REAL(wp) ::  bottom_salinityflux = 0.0_wp                  !< namelist parameter
    REAL(wp) ::  building_height = 50.0_wp                     !< namelist parameter
    REAL(wp) ::  building_length_x = 50.0_wp                   !< namelist parameter
    REAL(wp) ::  building_length_y = 50.0_wp                   !< namelist parameter
    REAL(wp) ::  building_wall_left = 9999999.9_wp             !< namelist parameter
    REAL(wp) ::  building_wall_south = 9999999.9_wp            !< namelist parameter
    REAL(wp) ::  canyon_height = 50.0_wp                       !< namelist parameter
    REAL(wp) ::  canyon_width_x = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  canyon_width_y = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  canyon_wall_left = 9999999.9_wp               !< namelist parameter
    REAL(wp) ::  canyon_wall_south = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  cfl_factor = -1.0_wp                          !< namelist parameter
    REAL(wp) ::  cos_alpha_surface                             !< cosine of alpha_surface
    REAL(wp) ::  coupling_start_time = 0.0_wp                  !< namelist parameter
    REAL(wp) ::  disturbance_amplitude = 0.25_wp               !< namelist parameter
    REAL(wp) ::  disturbance_energy_limit = 0.01_wp            !< namelist parameter
    REAL(wp) ::  disturbance_level_b = -9999999.9_wp           !< namelist parameter
    REAL(wp) ::  disturbance_level_t = -9999999.9_wp           !< namelist parameter
    REAL(wp) ::  dp_level_b = 0.0_wp                           !< namelist parameter
    REAL(wp) ::  dt = -1.0_wp                                  !< namelist parameter
    REAL(wp) ::  dt_averaging_input = 0.0_wp                   !< namelist parameter
    REAL(wp) ::  dt_averaging_input_pr = 9999999.9_wp          !< namelist parameter
    REAL(wp) ::  dt_coupling = 9999999.9_wp                    !< namelist parameter
    REAL(wp) ::  dt_data_output = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  dt_data_output_av = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  dt_disturb = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  dt_dopr = 9999999.9_wp                        !< namelist parameter
    REAL(wp) ::  dt_dopr_listing = 9999999.9_wp                !< namelist parameter
    REAL(wp) ::  dt_dopts = 9999999.9_wp                       !< namelist parameter
    REAL(wp) ::  dt_dots = 9999999.9_wp                        !< namelist parameter
    REAL(wp) ::  dt_do2d_xy = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  dt_do2d_xz = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  dt_do2d_yz = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  dt_do3d = 9999999.9_wp                        !< namelist parameter
    REAL(wp) ::  dt_dvrp = 9999999.9_wp                        !< namelist parameter
    REAL(wp) ::  dt_max = 20.0_wp                              !< namelist parameter
    REAL(wp) ::  dt_restart = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  dt_run_control = 60.0_wp                      !< namelist parameter
    REAL(wp) ::  dt_spinup = 60.0_wp                           !< namelist parameter
    REAL(wp) ::  dt_3d = 1.0_wp                                !< time step
    REAL(wp) ::  dz = -1.0_wp                                  !< namelist parameter
    REAL(wp) ::  dz_max = 9999999.9_wp                         !< namelist parameter
    REAL(wp) ::  dz_stretch_factor = 1.08_wp                   !< namelist parameter
    REAL(wp) ::  dz_stretch_level = 100000.0_wp                !< namelist parameter
    REAL(wp) ::  e_init = 0.0_wp                               !< namelist parameter
    REAL(wp) ::  e_min = 0.0_wp                                !< namelist parameter
    REAL(wp) ::  end_time = 0.0_wp                             !< namelist parameter
    REAL(wp) ::  f = 0.0_wp                                    !< Coriolis parameter
    REAL(wp) ::  fs = 0.0_wp                                   !< Coriolis parameter
    REAL(wp) ::  g = 9.81_wp                                   !< gravitational acceleration
    REAL(wp) ::  inflow_damping_height = 9999999.9_wp          !< namelist parameter
    REAL(wp) ::  inflow_damping_width = 9999999.9_wp           !< namelist parameter
    REAL(wp) ::  kappa = 0.4_wp                                !< von Karman constant
    REAL(wp) ::  km_constant = -1.0_wp                         !< namelist parameter
    REAL(wp) ::  mask_scale_x = 1.0_wp                         !< namelist parameter
    REAL(wp) ::  mask_scale_y = 1.0_wp                         !< namelist parameter
    REAL(wp) ::  mask_scale_z = 1.0_wp                         !< namelist parameter
    REAL(wp) ::  maximum_cpu_time_allowed = 0.0_wp             !< given wall time for run
    REAL(wp) ::  molecular_viscosity = 1.461E-5_wp             !< molecular viscosity (used in lsm and lpm)
    REAL(wp) ::  old_dt = 1.0E-10_wp                           !< length of previous timestep
    REAL(wp) ::  omega = 7.29212E-5_wp                         !< namelist parameter
    REAL(wp) ::  omega_sor = 1.8_wp                            !< namelist parameter
    REAL(wp) ::  outflow_source_plane = -9999999.9_wp          !< namelist parameter
    REAL(wp) ::  particle_maximum_age = 9999999.9_wp           !< namelist parameter
    REAL(wp) ::  phi = 55.0_wp                                 !< namelist parameter
    REAL(wp) ::  prandtl_number = 1.0_wp                       !< namelist parameter
    REAL(wp) ::  precipitation_amount_interval = 9999999.9_wp  !< namelist parameter
    REAL(wp) ::  prho_reference                                !< reference state of potential density
    REAL(wp) ::  pt_damping_factor = 0.0_wp                    !< namelist parameter
    REAL(wp) ::  pt_damping_width = 0.0_wp                     !< namelist parameter
    REAL(wp) ::  pt_reference = 9999999.9_wp                   !< namelist parameter
    REAL(wp) ::  pt_slope_offset = 0.0_wp                      !< temperature difference between left and right 
                                                               !< boundary of total domain
    REAL(wp) ::  pt_surface = 300.0_wp                         !< namelist parameter
    REAL(wp) ::  pt_surface_initial_change = 0.0_wp            !< namelist parameter
    REAL(wp) ::  q_surface = 0.0_wp                            !< namelist parameter
    REAL(wp) ::  q_surface_initial_change = 0.0_wp             !< namelist parameter
    REAL(wp) ::  rayleigh_damping_factor = -1.0_wp             !< namelist parameter
    REAL(wp) ::  rayleigh_damping_height = -1.0_wp             !< namelist parameter
    REAL(wp) ::  recycling_width = 9999999.9_wp                !< namelist parameter
    REAL(wp) ::  residual_limit = 1.0E-4_wp                    !< namelist parameter
    REAL(wp) ::  restart_time = 9999999.9_wp                   !< namelist parameter
    REAL(wp) ::  rho_reference                                 !< reference state of density
    REAL(wp) ::  rho_surface                                   !< surface value of density
    REAL(wp) ::  roughness_length = 0.1_wp                     !< namelist parameter
    REAL(wp) ::  sa_surface = 35.0_wp                          !< namelist parameter
    REAL(wp) ::  simulated_time = 0.0_wp                       !< elapsed simulated time
    REAL(wp) ::  simulated_time_at_begin                       !< elapsed simulated time of previous run (job chain)
    REAL(wp) ::  sin_alpha_surface                             !< sine of alpha_surface (sloped surface)
    REAL(wp) ::  skip_time_data_output = 0.0_wp                !< namelist parameter
    REAL(wp) ::  skip_time_data_output_av = 9999999.9_wp       !< namelist parameter
    REAL(wp) ::  skip_time_dopr = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  skip_time_do2d_xy = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  skip_time_do2d_xz = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  skip_time_do2d_yz = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  skip_time_do3d = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  spinup_pt_amplitude = 9999999.9_wp            !< namelist parameter
    REAL(wp) ::  spinup_pt_mean = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  spinup_time = 0.0_wp                          !< namelist parameter
    REAL(wp) ::  surface_heatflux = 9999999.9_wp               !< namelist parameter
    REAL(wp) ::  surface_pressure = 1013.25_wp                 !< namelist parameter
    REAL(wp) ::  surface_scalarflux = 9999999.9_wp             !< namelist parameter
    REAL(wp) ::  surface_waterflux = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  s_surface = 0.0_wp                            !< namelist parameter
    REAL(wp) ::  s_surface_initial_change = 0.0_wp             !< namelist parameter
    REAL(wp) ::  termination_time_needed = 35.0_wp             !< namelist parameter
    REAL(wp) ::  time_coupling = 0.0_wp                        !< time since last coupling (surface_coupler)
    REAL(wp) ::  time_disturb = 0.0_wp                         !< time since last flow disturbance
    REAL(wp) ::  time_dopr = 0.0_wp                            !< time since last profile output
    REAL(wp) ::  time_dopr_av = 0.0_wp                         !< time since last averaged profile output
    REAL(wp) ::  time_dopr_listing = 0.0_wp                    !< time since last profile output (ASCII) on file
    REAL(wp) ::  time_dopts = 0.0_wp                           !< time since last particle timeseries output
    REAL(wp) ::  time_dosp = 0.0_wp                            !< time since last spectra output
    REAL(wp) ::  time_dosp_av = 0.0_wp                         !< time since last averaged spectra output
    REAL(wp) ::  time_dots = 0.0_wp                            !< time since last timeseries output
    REAL(wp) ::  time_do2d_xy = 0.0_wp                         !< time since last xy cross-section output
    REAL(wp) ::  time_do2d_xz = 0.0_wp                         !< time since last xz cross-section output
    REAL(wp) ::  time_do2d_yz = 0.0_wp                         !< time since last yz cross-section output
    REAL(wp) ::  time_do3d = 0.0_wp                            !< time since last 3d output
    REAL(wp) ::  time_do_av = 0.0_wp                           !< time since last averaged-data output
    REAL(wp) ::  time_do_sla = 0.0_wp                          !< time since last 
    REAL(wp) ::  time_dvrp = 0.0_wp                            !< time since last dvrp output
    REAL(wp) ::  time_restart = 9999999.9_wp                   !< time at which run shall be terminated and restarted
    REAL(wp) ::  time_run_control = 0.0_wp                     !< time since last RUN_CONTROL output
    REAL(wp) ::  time_since_reference_point                    !< time after atmosphere-ocean coupling has been activated, or time after spinup phase of LSM has been finished
    REAL(wp) ::  top_heatflux = 9999999.9_wp                   !< namelist parameter
    REAL(wp) ::  top_momentumflux_u = 9999999.9_wp             !< namelist parameter
    REAL(wp) ::  top_momentumflux_v = 9999999.9_wp             !< namelist parameter
    REAL(wp) ::  top_salinityflux = 9999999.9_wp               !< namelist parameter
    REAL(wp) ::  top_scalarflux = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  tunnel_height = 9999999.9_wp                  !< namelist parameter
    REAL(wp) ::  tunnel_length = 9999999.9_wp                  !< namelist parameter
    REAL(wp) ::  tunnel_width_x = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  tunnel_width_y = 9999999.9_wp                 !< namelist parameter
    REAL(wp) ::  tunnel_wall_depth = 9999999.9_wp              !< namelist parameter
    REAL(wp) ::  ug_surface = 0.0_wp                           !< namelist parameter 
    REAL(wp) ::  u_bulk = 0.0_wp                               !< namelist parameter 
    REAL(wp) ::  u_gtrans = 0.0_wp                             !< transformed wind component (galilei transformation)
    REAL(wp) ::  vg_surface = 0.0_wp                           !< namelist parameter
    REAL(wp) ::  vpt_reference = 9999999.9_wp                  !< reference state of virtual potential temperature
    REAL(wp) ::  v_bulk = 0.0_wp                               !< namelist parameter
    REAL(wp) ::  v_gtrans = 0.0_wp                             !< transformed wind component (galilei transformation)
    REAL(wp) ::  wall_adjustment_factor = 1.8_wp               !< adjustment factor for mixing length l
    REAL(wp) ::  zeta_max = 20.0_wp                            !< namelist parameter
    REAL(wp) ::  zeta_min = -20.0_wp                           !< namelist parameter
    REAL(wp) ::  z_max_do2d = -1.0_wp                          !< namelist parameter
    REAL(wp) ::  z0h_factor = 1.0_wp                           !< namelist parameter

    REAL(wp) ::  do2d_xy_last_time(0:1) = -1.0_wp                  !< time of previous xy output
    REAL(wp) ::  do2d_xz_last_time(0:1) = -1.0_wp                  !< time of previous xz output
    REAL(wp) ::  do2d_yz_last_time(0:1) = -1.0_wp                  !< time of previous yz output
    REAL(wp) ::  dpdxy(1:2) = 0.0_wp                               !< namelist parameter
    REAL(wp) ::  dt_domask(max_masks) = 9999999.9_wp               !< namelist parameter
    REAL(wp) ::  mask_scale(3)                                     !< collective array for mask_scale_x/y/z
    REAL(wp) ::  pt_vertical_gradient(10) = 0.0_wp                 !< namelist parameter
    REAL(wp) ::  pt_vertical_gradient_level(10) = -1.0_wp          !< namelist parameter
    REAL(wp) ::  q_vertical_gradient(10) = 0.0_wp                  !< namelist parameter
    REAL(wp) ::  q_vertical_gradient_level(10) = -1.0_wp           !< namelist parameter
    REAL(wp) ::  s_vertical_gradient(10) = 0.0_wp                  !< namelist parameter
    REAL(wp) ::  s_vertical_gradient_level(10) = -1.0_wp           !< namelist parameter
    REAL(wp) ::  sa_vertical_gradient(10) = 0.0_wp                 !< namelist parameter
    REAL(wp) ::  sa_vertical_gradient_level(10) = -1.0_wp          !< namelist parameter
    REAL(wp) ::  skip_time_domask(max_masks) = 9999999.9_wp        !< namelist parameter
    REAL(wp) ::  threshold(20) = 0.0_wp                            !< namelist parameter
    REAL(wp) ::  time_domask(max_masks) = 0.0_wp                   !< namelist parameter
    REAL(wp) ::  tsc(10) = (/ 1.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, &    !< array used for controlling time-integration at different substeps
                 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp, 0.0_wp /)
    REAL(wp) ::  u_profile(100) = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  uv_heights(100) = 9999999.9_wp                    !< namelist parameter
    REAL(wp) ::  v_profile(100) = 9999999.9_wp                     !< namelist parameter
    REAL(wp) ::  ug_vertical_gradient(10) = 0.0_wp                 !< namelist parameter
    REAL(wp) ::  ug_vertical_gradient_level(10) = -9999999.9_wp    !< namelist parameter
    REAL(wp) ::  vg_vertical_gradient(10) = 0.0_wp                 !< namelist parameter
    REAL(wp) ::  vg_vertical_gradient_level(10) = -9999999.9_wp    !< namelist parameter
    REAL(wp) ::  volume_flow(1:3) = 0.0_wp                         !< volume flow through 1:yz-plane, 2: xz-plane, 3: xy-plane (nest childs only)
    REAL(wp) ::  volume_flow_area(1:3) = 0.0_wp                    !< area of the respective volume flow planes
    REAL(wp) ::  volume_flow_initial(1:3) = 0.0_wp                 !< initial volume flow (t=0) through the respective volume flow planes
    REAL(wp) ::  wall_heatflux(0:5) = 0.0_wp                       !< namelist parameter
    REAL(wp) ::  wall_humidityflux(0:5) = 0.0_wp                   !< namelist parameter
    REAL(wp) ::  wall_salinityflux(0:5) = 0.0_wp                   !< namelist parameter
    REAL(wp) ::  wall_scalarflux(0:5) = 0.0_wp                     !< namelist parameter 
    REAL(wp) ::  subs_vertical_gradient(10) = 0.0_wp               !< namelist parameter 
    REAL(wp) ::  subs_vertical_gradient_level(10) = -9999999.9_wp  !< namelist parameter

    REAL(wp), DIMENSION(:), ALLOCATABLE ::  dp_smooth_factor  !< smoothing factor for external pressure gradient forcing

    REAL(wp), DIMENSION(max_masks,mask_xyz_dimension) ::  mask_x = -1.0_wp  !< namelist parameter
    REAL(wp), DIMENSION(max_masks,mask_xyz_dimension) ::  mask_y = -1.0_wp  !< namelist parameter
    REAL(wp), DIMENSION(max_masks,mask_xyz_dimension) ::  mask_z = -1.0_wp  !< namelist parameter
    
    REAL(wp), DIMENSION(max_masks,3) ::  mask_x_loop = -1.0_wp  !< namelist parameter
    REAL(wp), DIMENSION(max_masks,3) ::  mask_y_loop = -1.0_wp  !< namelist parameter
    REAL(wp), DIMENSION(max_masks,3) ::  mask_z_loop = -1.0_wp  !< namelist parameter
    
!
!--    internal mask arrays ("mask,dimension,selection")
       REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  mask       !< collective array for mask_x/y/z
       REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  mask_loop  !< collective array for mask_x/y/z_loop

    SAVE

 END MODULE control_parameters


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables used with dvrp-software.
!------------------------------------------------------------------------------!
 MODULE dvrp_variables

    USE kinds

    CHARACTER (LEN=10) ::  dvrp_output = 'rtsp'        !< dvr namelist parameter
    CHARACTER (LEN=10) ::  particle_color = 'none'     !< dvr namelist parameter
    CHARACTER (LEN=10) ::  particle_dvrpsize = 'none'  !< dvr namelist parameter

    CHARACTER (LEN=20), DIMENSION(10) ::  mode_dvrp = &  !< dvr namelist parameter
                                     (/ ( '                    ', i9 = 1,10 ) /)

    CHARACTER (LEN=80) ::  dvrp_directory = 'default'                     !< dvr namelist parameter
    CHARACTER (LEN=80) ::  dvrp_file      = 'default'                     !< dvr namelist parameter
    CHARACTER (LEN=80) ::  dvrp_host      = 'origin.rvs.uni-hannover.de'  !< dvr namelist parameter
    CHARACTER (LEN=80) ::  dvrp_password  = '********'                    !< dvr namelist parameter
    CHARACTER (LEN=80) ::  dvrp_username  = ' '                           !< dvr namelist parameter

    INTEGER(iwp) ::  cluster_size = 1                   !< dvr namelist parameter
    INTEGER(iwp) ::  dvrp_colortable_entries = 4        !< internal dvr software variable
    INTEGER(iwp) ::  dvrp_colortable_entries_prt = 22   !< internal dvr software variable
    INTEGER(iwp) ::  islice_dvrp                        !< internal dvr software variable
    INTEGER(iwp) ::  nx_dvrp                            !< internal dvr software variable
    INTEGER(iwp) ::  nxl_dvrp                           !< internal dvr software variable
    INTEGER(iwp) ::  nxr_dvrp                           !< internal dvr software variable
    INTEGER(iwp) ::  ny_dvrp                            !< internal dvr software variable
    INTEGER(iwp) ::  nyn_dvrp                           !< internal dvr software variable
    INTEGER(iwp) ::  nys_dvrp                           !< internal dvr software variable
    INTEGER(iwp) ::  nz_dvrp                            !< internal dvr software variable
    INTEGER(iwp) ::  pathlines_fadeintime = 5           !< dvr namelist parameter
    INTEGER(iwp) ::  pathlines_fadeouttime = 5          !< dvr namelist parameter
    INTEGER(iwp) ::  pathlines_linecount = 1000         !< dvr namelist parameter
    INTEGER(iwp) ::  pathlines_maxhistory = 40          !< dvr namelist parameter
    INTEGER(iwp) ::  pathlines_wavecount = 10           !< dvr namelist parameter
    INTEGER(iwp) ::  pathlines_wavetime = 50            !< dvr namelist parameter
    INTEGER(iwp) ::  vc_gradient_normals = 0            !< dvr namelist parameter
    INTEGER(iwp) ::  vc_mode = 0                        !< dvr namelist parameter
    INTEGER(iwp) ::  vc_size_x = 2                      !< dvr namelist parameter
    INTEGER(iwp) ::  vc_size_y = 2                      !< dvr namelist parameter
    INTEGER(iwp) ::  vc_size_z = 2                      !< dvr namelist parameter

    INTEGER(iwp), DIMENSION(10) ::  slicer_position_dvrp  !< internal dvr software variable

    LOGICAL ::  cyclic_dvrp = .FALSE.                      !< internal dvr software variable
    LOGICAL ::  dvrp_overlap                               !< internal dvr software variable
    LOGICAL ::  dvrp_total_overlap                         !< internal dvr software variable
    LOGICAL ::  local_dvrserver_running                    !< namelist parameter (ENVPAR namelist provided by mrun)
    LOGICAL ::  lock_steering_update = .FALSE.             !< internal dvr software variable
    LOGICAL ::  use_seperate_pe_for_dvrp_output = .FALSE.  !< internal dvr software variable

    REAL(wp) ::  clip_dvrp_l = 9999999.9_wp  !< dvr namelist parameter
    REAL(wp) ::  clip_dvrp_n = 9999999.9_wp  !< dvr namelist parameter
    REAL(wp) ::  clip_dvrp_r = 9999999.9_wp  !< dvr namelist parameter
    REAL(wp) ::  clip_dvrp_s = 9999999.9_wp  !< dvr namelist parameter
    REAL(wp) ::  superelevation = 1.0_wp     !< dvr namelist parameter
    REAL(wp) ::  superelevation_x = 1.0_wp   !< dvr namelist parameter
    REAL(wp) ::  superelevation_y = 1.0_wp   !< dvr namelist parameter
    REAL(wp) ::  vc_alpha = 38.0_wp          !< dvr namelist parameter

    REAL(wp), DIMENSION(2) ::  color_interval = (/ 0.0_wp, 1.0_wp /)     !< dvr namelist parameter
    REAL(wp), DIMENSION(2) ::  dvrpsize_interval = (/ 0.0_wp, 1.0_wp /)  !< dvr namelist parameter

    REAL(wp), DIMENSION(3) ::  groundplate_color = (/ 0.0_wp, 0.6_wp, 0.0_wp /)  !< dvr namelist parameter
    REAL(wp), DIMENSION(3) ::  topography_color = (/ 0.8_wp, 0.7_wp, 0.6_wp /)   !< dvr namelist parameter

    REAL(wp), DIMENSION(2,10) ::  slicer_range_limits_dvrp  !< dvr namelist parameter

    REAL(wp), DIMENSION(3,10) ::  isosurface_color  !< dvr namelist parameter

    REAL(sp), DIMENSION(2,100) ::  interval_values_dvrp          !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_values_dvrp_prt      !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_h_dvrp               !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_h_dvrp_prt           !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_l_dvrp = 0.5_sp      !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_l_dvrp_prt = 0.5_sp  !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_s_dvrp = 1.0_sp      !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_s_dvrp_prt = 1.0_sp  !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_a_dvrp = 0.0_sp      !< internal dvr software variable
    REAL(sp), DIMENSION(2,100) ::  interval_a_dvrp_prt = 0.0_sp  !< internal dvr software variable

    DATA  slicer_range_limits_dvrp / -1.0_wp, 1.0_wp, -1.0_wp, 1.0_wp, -1.0_wp, 1.0_wp, &  !< internal dvr software variable
                                     -1.0_wp, 1.0_wp, -1.0_wp, 1.0_wp, -1.0_wp, 1.0_wp, &
                                     -1.0_wp, 1.0_wp, -1.0_wp, 1.0_wp, -1.0_wp, 1.0_wp, &
                                     -1.0_wp, 1.0_wp /

    DATA  isosurface_color / 0.9_wp, 0.9_wp, 0.9_wp,  0.8_wp, 0.1_wp, 0.1_wp,  0.1_wp, 0.1_wp, 0.8_wp, &  !< internal dvr software variable
                             0.1_wp, 0.8_wp, 0.1_wp,  0.6_wp, 0.1_wp, 0.1_wp,  0.1_wp, 0.1_wp, 0.6_wp, &
                             0.1_wp, 0.6_wp, 0.1_wp,  0.4_wp, 0.1_wp, 0.1_wp,  0.1_wp, 0.1_wp, 0.4_wp, &
                             0.1_wp, 0.4_wp, 0.1_wp /

    DATA  interval_h_dvrp / 270.0_wp, 225.0_wp, 225.0_wp, 180.0_wp, 70.0_wp, 25.0_wp, &  !< internal dvr software variable
                            25.0_wp, -25.0_wp, 192 * 0.0_wp /

    DATA  interval_h_dvrp_prt / 270.0_wp, 225.0_wp, 225.0_wp, 180.0_wp, 70.0_wp, 25.0_wp, &  !< internal dvr software variable
                                25.0_wp, -25.0_wp, 192 * 0.0_wp /

    REAL(sp), DIMENSION(:), ALLOCATABLE ::  xcoor_dvrp  !< internal dvr software variable
    REAL(sp), DIMENSION(:), ALLOCATABLE ::  ycoor_dvrp  !< internal dvr software variable
    REAL(sp), DIMENSION(:), ALLOCATABLE ::  zcoor_dvrp  !< internal dvr software variable

    TYPE steering
       CHARACTER (LEN=24) ::  name  !< internal dvr software variable
       REAL(sp)           ::  min   !< internal dvr software variable
       REAL(sp)           ::  max   !< internal dvr software variable
       INTEGER(iwp)       ::  imin  !< internal dvr software variable
       INTEGER(iwp)       ::  imax  !< internal dvr software variable
    END TYPE steering

    TYPE(steering), DIMENSION(:), ALLOCATABLE ::  steering_dvrp  !< internal dvr software variable

    SAVE

 END MODULE dvrp_variables


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of grid spacings.
!------------------------------------------------------------------------------!
 MODULE grid_variables

    USE kinds

    REAL(wp) ::  ddx          !< 1/dx
    REAL(wp) ::  ddx2         !< 1/dx2
    REAL(wp) ::  dx = 1.0_wp  !< horizontal grid size (along x-direction) 
    REAL(wp) ::  dx2          !< dx*dx
    REAL(wp) ::  ddy          !< 1/dy
    REAL(wp) ::  ddy2         !< 1/dy2
    REAL(wp) ::  dy = 1.0_wp  !< horizontal grid size (along y-direction)
    REAL(wp) ::  dy2          !< dy*dy

    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ddx2_mg  !< 1/dx_l**2 (dx_l: grid spacing along x on different multigrid level)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  ddy2_mg  !< 1/dy_l**2 (dy_l: grid spacing along y on different multigrid level)

    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  zu_s_inner  !< height of topography top on scalar grid 
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  zw_w_inner  !< height of topography top on w grid 
                                              
    SAVE

 END MODULE grid_variables


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of array bounds, number of gridpoints, and wall flag arrays.
!------------------------------------------------------------------------------!
 MODULE indices

    USE kinds

    INTEGER(iwp) ::  nbgp = 3     !< number of boundary ghost points
    INTEGER(iwp) ::  ngp_sums     !< number of vertical profile grid points time number of output profiles - used for allreduce statements in MPI calls
    INTEGER(iwp) ::  ngp_sums_ls  !< number of vertical profile grid points time number of large-scale forcing profiles - used for allreduce statements in MPI calls
    INTEGER(iwp) ::  nnx          !< number of subdomain grid points in x-direction
    INTEGER(iwp) ::  nx = 0       !< nx+1 = total number of grid points in x-direction
    INTEGER(iwp) ::  nx_a         !< in coupled atmosphere-ocean runs: total number of grid points along x (atmosphere)
    INTEGER(iwp) ::  nx_o         !< in coupled atmosphere-ocean runs: total number of grid points along x (ocean)
    INTEGER(iwp) ::  nxl          !< left-most grid index of subdomain (excluding ghost points)
    INTEGER(iwp) ::  nxlg         !< left-most grid index of subdomain (including ghost points)
    INTEGER(iwp) ::  nxlu         !< =nxl+1 (at left domain boundary with inflow from left), else =nxl (used for u-velocity component)
    INTEGER(iwp) ::  nxr          !< right-most grid index of subdomain (excluding ghost points)
    INTEGER(iwp) ::  nxrg         !< right-most grid index of subdomain (including ghost points)
    INTEGER(iwp) ::  nx_on_file   !< nx of previous run in job chain
    INTEGER(iwp) ::  nny          !< number of subdomain grid points in y-direction
    INTEGER(iwp) ::  ny = 0       !< ny+1 = total number of grid points in y-direction
    INTEGER(iwp) ::  ny_a         !< in coupled atmosphere-ocean runs: total number of grid points along y (atmosphere)
    INTEGER(iwp) ::  ny_o         !< in coupled atmosphere-ocean runs: total number of grid points along y (ocean)
    INTEGER(iwp) ::  nyn          !< north-most grid index of subdomain (excluding ghost points)
    INTEGER(iwp) ::  nyng         !< north-most grid index of subdomain (including ghost points)
    INTEGER(iwp) ::  nys          !< south-most grid index of subdomain (excluding ghost points)
    INTEGER(iwp) ::  nysg         !< south-most grid index of subdomain (including ghost points)
    INTEGER(iwp) ::  nysv         !< =nys+1 (at south domain boundary with inflow from south), else =nys (used for v-velocity component)
    INTEGER(iwp) ::  ny_on_file   !< ny of previous run in job chain
    INTEGER(iwp) ::  nnz          !< number of subdomain grid points in z-direction
    INTEGER(iwp) ::  nz = 0       !< total number of grid points in z-direction
    INTEGER(iwp) ::  nzb          !< bottom grid index of computational domain
    INTEGER(iwp) ::  nzb_diff     !< will be removed
    INTEGER(iwp) ::  nzb_max      !< vertical index of topography top
    INTEGER(iwp) ::  nzt          !< nzt+1 = top grid index of computational domain

    INTEGER(idp), DIMENSION(:), ALLOCATABLE ::  ngp_3d        !< number of grid points of the total domain
    INTEGER(idp), DIMENSION(:), ALLOCATABLE ::  ngp_3d_inner  !< ! need to have 64 bit for grids > 2E9
                    
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  ngp_2dh  !< number of grid points of a horizontal cross section through the total domain
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  nxl_mg   !< left-most grid index of subdomain on different multigrid level
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  nxr_mg   !< right-most grid index of subdomain on different multigrid level
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  nyn_mg   !< north-most grid index of subdomain on different multigrid level
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  nys_mg   !< south-most grid index of subdomain on different multigrid level
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  nzt_mg   !< top-most grid index of subdomain on different multigrid level


    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  ngp_2dh_outer     !< number of horizontal grid points which are non-topography and non-surface-bounded
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  ngp_2dh_s_inner   !< number of horizontal grid points which are non-topography
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  mg_loc_ind        !< internal array to store index bounds of all PEs of that multigrid level where data is collected to PE0
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_diff_s_inner  !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_diff_s_outer  !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_inner         !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_outer         !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_s_inner       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_s_outer       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_u_inner       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_u_outer       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_v_inner       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_v_outer       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_w_inner       !< will be removed
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  nzb_w_outer       !< will be removed

    INTEGER(iwp), DIMENSION(:,:,:), POINTER ::  flags  !< pointer to wall_flags_1-10

    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_1   !< topograpyh masking flag on multigrid level 1 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_2   !< topograpyh masking flag on multigrid level 2 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_3   !< topograpyh masking flag on multigrid level 3 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_4   !< topograpyh masking flag on multigrid level 4 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_5   !< topograpyh masking flag on multigrid level 5 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_6   !< topograpyh masking flag on multigrid level 6 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_7   !< topograpyh masking flag on multigrid level 7 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_8   !< topograpyh masking flag on multigrid level 8 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_9   !< topograpyh masking flag on multigrid level 9 
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE,  TARGET ::  wall_flags_10  !< topograpyh masking flag on multigrid level 10 

    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE ::  advc_flags_1            !< flags used to degrade order of advection scheme
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE ::  advc_flags_2            !< flags used to degrade order of advection scheme
    INTEGER(iwp), DIMENSION(:,:,:), ALLOCATABLE ::  wall_flags_0            !< flags to mask topography and surface-bounded grid points

    SAVE

 END MODULE indices


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Interfaces for special subroutines which use optional parameters.
!------------------------------------------------------------------------------!
 MODULE interfaces

    INTERFACE

!------------------------------------------------------------------------------!
! Description:
! ------------
!> @todo Missing subroutine description.
!------------------------------------------------------------------------------!
       SUBROUTINE global_min_max ( i1, i2, j1, j2, k1, k2, array, mode, offset, &
                                   result, result_ijk, result1, result1_ijk )

          USE kinds

          CHARACTER (LEN=*), INTENT(IN) ::  mode                      !< mode of global min/max function: can be 'min', 'max', 'minmax', 'abs', or 'absoff'
          INTEGER(iwp), INTENT(IN)      ::  i1                        !< internal index of min/max function
          INTEGER(iwp), INTENT(IN)      ::  i2                        !< internal index of min/max function
          INTEGER(iwp), INTENT(IN)      ::  j1                        !< internal index of min/max function
          INTEGER(iwp), INTENT(IN)      ::  j2                        !< internal index of min/max function
          INTEGER(iwp), INTENT(IN)      ::  k1                        !< internal index of min/max function
          INTEGER(iwp), INTENT(IN)      ::  k2                        !< internal index of min/max function
          INTEGER(iwp)                  ::  result_ijk(3)             !< grid index result of min/max function
          INTEGER(iwp), OPTIONAL        ::  result1_ijk(3)            !< optional grid index result of min/max function
          REAL(wp)                      ::  offset                    !< min/max function calculates absolute value with respect to an offset
          REAL(wp)                      ::  result                    !< result of min/max function
          REAL(wp), OPTIONAL            ::  result1                   !< optional result of min/max function
          REAL(wp), INTENT(IN)          ::  array(i1:i2,j1:j2,k1:k2)  !< input array of min/max function

       END SUBROUTINE global_min_max

    END INTERFACE

    SAVE

 END MODULE interfaces


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Interfaces for subroutines with pointer arguments called in
!> prognostic_equations.
!------------------------------------------------------------------------------!
 MODULE pointer_interfaces

    INTERFACE

!------------------------------------------------------------------------------!
! Description:
! ------------
!> @todo Missing subroutine description.
!------------------------------------------------------------------------------!
       SUBROUTINE advec_s_bc( sk, sk_char )

          USE kinds

          CHARACTER (LEN=*), INTENT(IN) ::  sk_char  !< string for treated scalar in Bott-Chlond scheme
#if defined( __nopointer )
          REAL(wp), DIMENSION(:,:,:) ::  sk  !< treated scalar array in Bott-Chlond scheme
#else
          REAL(wp), DIMENSION(:,:,:), POINTER ::  sk  !< treated scalar array in Bott-Chlond scheme
#endif
       END SUBROUTINE advec_s_bc

    END INTERFACE

    SAVE

 END MODULE pointer_interfaces


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables for the 1D-model.
!------------------------------------------------------------------------------!
 MODULE model_1d

    USE kinds

    INTEGER(iwp) ::  current_timestep_number_1d = 0  !< current timestep number (1d-model)
    INTEGER(iwp) ::  damp_level_ind_1d               !< lower grid index of damping layer (1d-model)

    LOGICAL ::  run_control_header_1d = .FALSE.  !< flag for output of run control header (1d-model)
    LOGICAL ::  stop_dt_1d = .FALSE.             !< termination flag, used in case of too small timestep (1d-model)

    REAL(wp) ::  damp_level_1d = -1.0_wp       !< namelist parameter
    REAL(wp) ::  dt_1d = 60.0_wp               !< dynamic timestep (1d-model)
    REAL(wp) ::  dt_max_1d = 300.0_wp          !< timestep limit (1d-model)
    REAL(wp) ::  dt_pr_1d = 9999999.9_wp       !< namelist parameter
    REAL(wp) ::  dt_run_control_1d = 60.0_wp   !< namelist parameter
    REAL(wp) ::  end_time_1d = 864000.0_wp     !< namelist parameter
    REAL(wp) ::  old_dt_1d = 1.0E-10_wp        !< previous timestep (1d-model)
    REAL(wp) ::  qs1d                          !< characteristic humidity scale (1d-model)
    REAL(wp) ::  simulated_time_1d = 0.0_wp    !< updated simulated time (1d-model)
    REAL(wp) ::  time_pr_1d = 0.0_wp           !< updated simulated time for profile output (1d-model)
    REAL(wp) ::  time_run_control_1d = 0.0_wp  !< updated simulated time for run-control output (1d-model)
    REAL(wp) ::  ts1d                          !< characteristic temperature scale (1d-model)
    REAL(wp) ::  us1d                          !< friction velocity (1d-model)
    REAL(wp) ::  usws1d                        !< u-component of the momentum flux (1d-model)
    REAL(wp) ::  vsws1d                        !< v-component of the momentum flux (1d-model)    
    REAL(wp) ::  z01d                          !< roughness length for momentum (1d-model)
    REAL(wp) ::  z0h1d                         !< roughness length for scalars (1d-model)


    REAL(wp), DIMENSION(:), ALLOCATABLE ::  e1d      !< tke (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  e1d_p    !< prognostic value of tke (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  kh1d     !< turbulent diffusion coefficient for heat (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  km1d     !< turbulent diffusion coefficient for momentum (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  l_black  !< mixing length Blackadar (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  l1d      !< mixing length (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  rif1d    !< Richardson flux number (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  te_e     !< tendency of e (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  te_em    !< weighted tendency of e for previous sub-timestep (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  te_u     !< tendency of u (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  te_um    !< weighted tendency of u for previous sub-timestep (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  te_v     !< tendency of v (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  te_vm    !< weighted tendency of v for previous sub-timestep (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  u1d      !< u-velocity component (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  u1d_p    !< prognostic value of u-velocity component (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  v1d      !< v-velocity component (1d-model)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  v1d_p    !< prognostic value of v-velocity component (1d-model)

    SAVE

 END MODULE model_1d




!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables which define processor topology and the exchange of
!> ghost point layers. This module must be placed in all routines containing
!> MPI-calls.
!------------------------------------------------------------------------------!
 MODULE pegrid

    USE kinds

#if defined( __parallel )
#if defined( __mpifh )
    INCLUDE "mpif.h"
#else
    USE MPI
#endif
#endif
    CHARACTER(LEN=2) ::  send_receive = 'al'     !<
    CHARACTER(LEN=7) ::  myid_char = ''          !< character string containing processor id number
    
    INTEGER(iwp) ::  comm1dx                     !< communicator for domain decomposition along x
    INTEGER(iwp) ::  comm1dy                     !< communicator for domain decomposition along y
    INTEGER(iwp) ::  comm2d                      !< standard 2d (xy) communicator used in PALM for the process group the PE belongs to
    INTEGER(iwp) ::  comm_inter                  !< intercommunicator that connects atmosphere/ocean process groups
    INTEGER(iwp) ::  comm_palm                   !< internal communicator used during the MPI setup at the beginning of a run
    INTEGER(iwp) ::  id_inflow = 0               !< myidx of procs at inflow (turbulent inflow method)
    INTEGER(iwp) ::  id_outflow = 0              !< myidx of procs at outflow (turbulent outflow method)
    INTEGER(iwp) ::  id_outflow_source = 0       !< myidx of procs including ouflow source plane (turbulent outflow method)
    INTEGER(iwp) ::  id_recycling = 0            !< myidx of procs containing the recycling plane (turbulence recycling method)
    INTEGER(iwp) ::  ierr                        !< standard error parameter in MPI calls
    INTEGER(iwp) ::  myid = 0                    !< id number of processor element
    INTEGER(iwp) ::  myidx = 0                   !< id number of processor elements with same position along x-direction
    INTEGER(iwp) ::  myidy = 0                   !< id number of processor elements with same position along y-direction
    INTEGER(iwp) ::  ndim = 2                    !< dimension of the virtual PE grid
    INTEGER(iwp) ::  ngp_a                       !< used in atmosphere/ocean coupling: total number of horizontal grid points (atmosphere)
    INTEGER(iwp) ::  ngp_o                       !< used in atmosphere/ocean coupling: total number of horizontal grid points (ocean)
    INTEGER(iwp) ::  ngp_xy                      !< used in atmosphere/ocean coupling: number of grid points of the subdomain
    INTEGER(iwp) ::  ngp_y                       !< number of subdomain grid points along y including ghost points
    INTEGER(iwp) ::  npex = -1                   !< number of processor elements in x-direction
    INTEGER(iwp) ::  npey = -1                   !< number of processor elements in y-direction
    INTEGER(iwp) ::  numprocs = 1                !< total number of appointed processor elements
    INTEGER(iwp) ::  numprocs_previous_run = -1  !< total number of appointed processor elements in previous run (job chain)
    INTEGER(iwp) ::  pleft                       !< MPI-address of the processor left of the current one
    INTEGER(iwp) ::  pnorth                      !< MPI-address of the processor north of the current one
    INTEGER(iwp) ::  pright                      !< MPI-address of the processor right of the current one
    INTEGER(iwp) ::  psouth                      !< MPI-address of the processor south of the current one
    INTEGER(iwp) ::  req_count = 0               !< MPI return variable - checks if Send-Receive operation is already finished
    INTEGER(iwp) ::  sendrecvcount_xy            !< number of subdomain gridpoints to be exchanged in direct transpositions (y --> x, or x --> y) or second (2d) transposition x --> y
    INTEGER(iwp) ::  sendrecvcount_yz            !< number of subdomain gridpoints to be exchanged in third (2d) transposition y --> z
    INTEGER(iwp) ::  sendrecvcount_zx            !< number of subdomain gridpoints to be exchanged in first (2d) transposition z --> x
    INTEGER(iwp) ::  sendrecvcount_zyd           !< number of subdomain gridpoints to be exchanged in direct transpositions z --> y (used for calculating spectra)
    INTEGER(iwp) ::  target_id                   !< in atmosphere/ocean coupling: id of the ocean/atmosphere counterpart PE with whom the atmosphere/ocean PE exchanges data
    INTEGER(iwp) ::  tasks_per_node = -9999      !< MPI tasks per compute node
    INTEGER(iwp) ::  threads_per_task = 1        !< number of OPENMP threads per MPI task
    INTEGER(iwp) ::  type_x                      !< derived MPI datatype for 2-D ghost-point exchange - north / south 
    INTEGER(iwp) ::  type_xy                     !< derived MPI datatype for 2-D ghost-point exchange - north / south 
    INTEGER(iwp) ::  type_y                      !< derived MPI datatype for 2-D exchange in atmosphere-ocean coupler 

    INTEGER(iwp) ::  pdims(2) = 1  !< number of processors along x-y dimension
    INTEGER(iwp) ::  req(100)      !< MPI return variable indicating if send-receive operation is finished

    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  hor_index_bounds               !< horizontal index bounds 
    INTEGER(iwp), DIMENSION(:,:), ALLOCATABLE ::  hor_index_bounds_previous_run  !< horizontal index bounds of previous run

    LOGICAL ::  collective_wait = .FALSE.          !< switch to set an explicit MPI barrier in front of all collective MPI calls

#if defined( __parallel )
    INTEGER(iwp) ::  ibuf(12)                 !< internal buffer for calculating MPI settings
    INTEGER(iwp) ::  pcoord(2)                !< PE coordinates along x and y
    INTEGER(iwp) ::  status(MPI_STATUS_SIZE)  !< MPI status variable used in various MPI calls
    
    INTEGER(iwp), DIMENSION(MPI_STATUS_SIZE,100) ::  wait_stat  !< MPI status variable used in various MPI calls
    
    INTEGER(iwp) ::  ngp_yz_int   !< number of ghost points in yz-plane 
    INTEGER(iwp) ::  type_xz_int  !< derived MPI datatype for 3-D integer ghost-point exchange - north / south
    INTEGER(iwp) ::  type_yz_int  !< derived MPI datatype for 3-D integer ghost-point exchange - left / right

    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  ngp_xz      !< number of ghost points in xz-plane on different multigrid level
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  ngp_yz      !< number of ghost points in yz-plane on different multigrid level
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  type_x_int  !< derived MPI datatype for 2-D integer ghost-point exchange - north / south
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  type_xz     !< derived MPI datatype for 3-D integer ghost-point exchange - north / south
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  type_y_int  !< derived MPI datatype for 2-D integer ghost-point exchange - left / right
    INTEGER(iwp), DIMENSION(:), ALLOCATABLE ::  type_yz     !< derived MPI datatype for 3-D integer ghost-point exchange - left / right 

    LOGICAL ::  left_border_pe  = .FALSE.  !< = .TRUE. if PE is on left border of computational domain
    LOGICAL ::  north_border_pe = .FALSE.  !< = .TRUE. if PE is on north border of computational domain
    LOGICAL ::  reorder = .TRUE.           !< switch to allow MPI the reorder of ranking (e.g. row-major or column-major)
    LOGICAL ::  right_border_pe = .FALSE.  !< = .TRUE. if PE is on right border of computational domain
    LOGICAL ::  south_border_pe = .FALSE.  !< = .TRUE. if PE is on south border of computational domain

    LOGICAL, DIMENSION(2) ::  cyclic = (/ .TRUE. , .TRUE. /)  !< boundary conditions of the virtual PE grid
    LOGICAL, DIMENSION(2) ::  remain_dims                     !< internal array used to determine sub-topologies for transpositions
#endif

    SAVE

 END MODULE pegrid


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of variables which control PROFIL-output.
!------------------------------------------------------------------------------!
 MODULE profil_parameter

    USE kinds

    INTEGER(iwp), PARAMETER ::  crmax = 100  !< maximum number of coordinate systems for profile output

    CHARACTER (LEN=20), DIMENSION(20) ::  cross_ts_profiles = &  !< time series to be plotted into one coordinate system, respectively
                           (/ ' E E*               ', ' dt                 ', &
                              ' u* w*              ', ' th*                ', &
                              ' umax vmax wmax     ', ' div_old div_new    ', &
                              ' z_i_wpt z_i_pt     ', ' w"pt"0 w"pt" wpt   ', &
                              ' pt(0) pt(zp)       ', ' splux spluy spluz  ', &
                              ' L                  ',                         &
                            ( '                    ', i9 = 1, 9 ) /)

    CHARACTER (LEN=100), DIMENSION(crmax) ::  cross_profiles = &  !< quantities to be plotted into one coordinate system, respectively
                           (/ ' u v                           ', &
                              ' pt                            ', &
                              ' w"pt" w*pt* w*pt*BC wpt wptBC ', &
                              ' w"u" w*u* wu w"v" w*v* wv     ', &
                              ' km kh                         ', &
                              ' l                             ', &
                         ( '                               ', i9 = 1, 94 ) /)

    INTEGER(iwp) ::  profile_columns = 2  !< number of coordinate systems on a profile plot per column
    INTEGER(iwp) ::  profile_rows = 3     !< number of coordinate systems on a profile plot per row

    INTEGER(iwp) ::  dopr_index(300) = 0                !< index number of respective profile quantity
    INTEGER(iwp) ::  dopr_initial_index(300) = 0        !< index number of initial profiles to be output
                
    SAVE

 END MODULE profil_parameter

!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of statistical quantities, e.g. global sums.
!------------------------------------------------------------------------------!
 MODULE statistics

    USE kinds

    CHARACTER (LEN=40) ::  region(0:9)  !< label for statistic region
    
    INTEGER(iwp) ::  pr_palm = 130          !< maximum number of output profiles
    INTEGER(iwp) ::  statistic_regions = 0  !< identifier for statistic regions
    
    INTEGER(iwp) ::  u_max_ijk(3) = -1  !< index values (i,j,k) of location where u_max occurs
    INTEGER(iwp) ::  v_max_ijk(3) = -1  !< index values (i,j,k) of location where v_max occurs
    INTEGER(iwp) ::  w_max_ijk(3) = -1  !< index values (i,j,k) of location where w_max occurs
    
    LOGICAL ::  flow_statistics_called = .FALSE.  !< flag that tells other routines if flow statistics was executed
                                                  !< (after each timestep)
    
    REAL(wp) ::  u_max  !< maximum of absolute u-veloctiy in entire domain
    REAL(wp) ::  v_max  !< maximum of absolute v-veloctiy in entire domain
    REAL(wp) ::  w_max  !< maximum of absolute w-veloctiy in entire domain
    
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  mean_surface_level_height  !< mean surface level height for the different statistic regions
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  sums_divnew_l              !< subdomain sum (_l) of divergence after pressure 
                                                                       !< solver call (new)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  sums_divold_l              !< subdomain sum (_l) of divergence before pressure
                                                                       !< solver call (old)
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  weight_substep             !< weighting factor for substeps in timestepping
    REAL(wp), DIMENSION(:), ALLOCATABLE ::  weight_pres                !< substep weighting factor for pressure solver
    
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums             !< global sum array for the various output quantities
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsts_bc_l   !< subdomain sum of sensible heat flux in Bott-Chlond scheme
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  ts_value         !< timeseries output array for the various output quantities
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsus_ws_l   !< subdomain sum of vertical momentum flux w'u' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsvs_ws_l   !< subdomain sum of vertical momentum flux w'v' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_us2_ws_l    !< subdomain sum of horizontal momentum flux u'u' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_vs2_ws_l    !< subdomain sum of horizontal momentum flux v'v' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_ws2_ws_l    !< subdomain sum of vertical momentum flux w'w' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsncs_ws_l  !< subdomain sum of vertical clouddrop-number concentration flux w'nc' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsnrs_ws_l  !< subdomain sum of vertical raindrop-number concentration flux w'nr' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wspts_ws_l  !< subdomain sum of vertical sensible heat flux w'pt' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsqs_ws_l   !< subdomain sum of vertical latent heat flux w'q' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsqcs_ws_l  !< subdomain sum of vertical cloudwater flux w'qc' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsqrs_ws_l  !< subdomain sum of vertical rainwater flux w'qr' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wssas_ws_l  !< subdomain sum of vertical salinity flux w'sa' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_wsss_ws_l   !< subdomain sum of vertical passive scalar flux w's' (5th-order advection scheme only)
    REAL(wp), DIMENSION(:,:), ALLOCATABLE ::  sums_ls_l        !< subdomain sum of large scale forcing and nudging tendencies
                                              
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  hom_sum             !< sum array for horizontal mean
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  rmask               !< REAL flag array (0.0 or 1.0) for statistic regions
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  sums_l              !< subdomain sum (_l) gathered for various quantities
    REAL(wp), DIMENSION(:,:,:), ALLOCATABLE ::  sums_l_l            !< subdomain sum (_l) of mixing length from diffusivities

    REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE ::  hom  !< horizontal mean of various quantities (profiles/timeseries)

    SAVE

 END MODULE statistics



!------------------------------------------------------------------------------!
! Description:
! ------------
!> Definition of indices for transposed arrays.
!------------------------------------------------------------------------------!
 MODULE transpose_indices

    USE kinds

    INTEGER(iwp) ::  nxl_y   !< internal index bound for transpositions
    INTEGER(iwp) ::  nxl_yd  !< internal index bound for transpositions
    INTEGER(iwp) ::  nxl_z   !< internal index bound for transpositions
    INTEGER(iwp) ::  nxr_y   !< internal index bound for transpositions
    INTEGER(iwp) ::  nxr_yd  !< internal index bound for transpositions
    INTEGER(iwp) ::  nxr_z   !< internal index bound for transpositions
    INTEGER(iwp) ::  nyn_x   !< internal index bound for transpositions
    INTEGER(iwp) ::  nyn_z   !< internal index bound for transpositions
    INTEGER(iwp) ::  nys_x   !< internal index bound for transpositions
    INTEGER(iwp) ::  nys_z   !< internal index bound for transpositions
    INTEGER(iwp) ::  nzb_x   !< internal index bound for transpositions
    INTEGER(iwp) ::  nzb_y   !< internal index bound for transpositions
    INTEGER(iwp) ::  nzb_yd  !< internal index bound for transpositions
    INTEGER(iwp) ::  nzt_x   !< internal index bound for transpositions
    INTEGER(iwp) ::  nzt_y   !< internal index bound for transpositions
    INTEGER(iwp) ::  nzt_yd  !< internal index bound for transpositions
                
    SAVE

 END MODULE transpose_indices