source: palm/trunk/SOURCE/time_integration.f90 @ 3253

Last change on this file since 3253 was 3241, checked in by raasch, 6 years ago

various changes to avoid compiler warnings (mainly removal of unused variables)

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1!> @file time_integration.f90
2!------------------------------------------------------------------------------!
3! This file is part of the PALM model system.
4!
5! PALM is free software: you can redistribute it and/or modify it under the
6! terms of the GNU General Public License as published by the Free Software
7! Foundation, either version 3 of the License, or (at your option) any later
8! version.
9!
10! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
13!
14! You should have received a copy of the GNU General Public License along with
15! PALM. If not, see <http://www.gnu.org/licenses/>.
16!
17! Copyright 1997-2018 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: time_integration.f90 3241 2018-09-12 15:02:00Z suehring $
27! unused variables removed
28!
29! 3198 2018-08-15 09:23:10Z sward
30! Added multi_agent_system_end; defined start time for MAS relative to
31! time_since_reference_point
32!
33! 3183 2018-07-27 14:25:55Z suehring
34! Replace simulated_time by time_since_reference_point in COSMO nesting mode.
35! Rename subroutines and variables in COSMO nesting mode
36!
37! 3182 2018-07-27 13:36:03Z suehring
38! Added multi agent system
39!
40! 3042 2018-05-25 10:44:37Z schwenkel
41! Changed the name specific humidity to mixing ratio
42!
43! 3040 2018-05-25 10:22:08Z schwenkel
44! Fixed bug in IF statement
45! Ensure that the time when calling the radiation to be the time step of the
46! pre-calculated time when first calculate the positions of the sun
47!
48! 3004 2018-04-27 12:33:25Z Giersch
49! First call of flow_statistics has been removed. It is already called in
50! run_control itself
51!
52! 2984 2018-04-18 11:51:30Z hellstea
53! CALL pmci_ensure_nest_mass_conservation is removed (so far only commented out)
54! as seemingly unnecessary.
55!
56! 2941 2018-04-03 11:54:58Z kanani
57! Deduct spinup_time from RUN_CONTROL output of main 3d run
58! (use time_since_reference_point instead of simulated_time)
59!
60! 2938 2018-03-27 15:52:42Z suehring
61! Nesting of dissipation rate in case of RANS mode and TKE-e closure is applied
62!
63! 2936 2018-03-27 14:49:27Z suehring
64! Little formatting adjustment.
65!
66! 2817 2018-02-19 16:32:21Z knoop
67! Preliminary gust module interface implemented
68!
69! 2801 2018-02-14 16:01:55Z thiele
70! Changed lpm from subroutine to module.
71! Introduce particle transfer in nested models.
72!
73! 2776 2018-01-31 10:44:42Z Giersch
74! Variable use_synthetic_turbulence_generator has been abbreviated
75!
76! 2773 2018-01-30 14:12:54Z suehring
77! - Nesting for chemical species
78!
79! 2766 2018-01-22 17:17:47Z kanani
80! Removed preprocessor directive __chem
81!
82! 2718 2018-01-02 08:49:38Z maronga
83! Corrected "Former revisions" section
84!
85! 2696 2017-12-14 17:12:51Z kanani
86! - Change in file header (GPL part)
87! - Implementation of uv exposure model (FK)
88! - Moved vnest_boundary_conds_khkm from tcm_diffusivities to here (TG)
89! - renamed diffusivities to tcm_diffusivities (TG)
90! - implement prognostic equation for diss (TG)
91! - Moved/commented CALL to chem_emissions (FK)
92! - Added CALL to chem_emissions (FK)
93! - Implementation of chemistry module (FK)
94! - Calls for setting boundary conditions in USM and LSM (MS)
95! - Large-scale forcing with larger-scale models implemented (MS)
96! - Rename usm_radiation into radiation_interactions; merge with branch
97!   radiation (MS)
98! - added call for usm_green_heat_model for green building surfaces (RvT)
99! - added call for usm_temperature_near_surface for use in indoor model (RvT)
100!
101! 2617 2017-11-16 12:47:24Z suehring
102! Bugfix, assure that the reference state does not become zero.
103!
104! 2563 2017-10-19 15:36:10Z Giersch
105! Variable wind_turbine moved to module control_parameters
106!
107! 2365 2017-08-21 14:59:59Z kanani
108! Vertical grid nesting implemented (SadiqHuq)
109!
110! 2320 2017-07-21 12:47:43Z suehring
111! Set bottom boundary conditions after nesting interpolation and anterpolation
112!
113! 2299 2017-06-29 10:14:38Z maronga
114! Call of soil model adjusted
115!
116! 2292 2017-06-20 09:51:42Z schwenkel
117! Implementation of new microphysic scheme: cloud_scheme = 'morrison'
118! includes two more prognostic equations for cloud drop concentration (nc) 
119! and cloud water content (qc).
120!
121! 2271 2017-06-09 12:34:55Z sward
122! Start timestep message changed
123!
124! 2259 2017-06-08 09:09:11Z gronemeier
125! Implemented synthetic turbulence generator
126!
127! 2233 2017-05-30 18:08:54Z suehring
128!
129! 2232 2017-05-30 17:47:52Z suehring
130! Adjustments to new topography and surface concept
131! Modify passed parameters for disturb_field
132!
133! 2178 2017-03-17 11:07:39Z hellstea
134! Setting perturbations at all times near inflow boundary is removed
135! in case of nested boundaries
136!
137! 2174 2017-03-13 08:18:57Z maronga
138! Added support for nesting with cloud microphysics
139!
140! 2118 2017-01-17 16:38:49Z raasch
141! OpenACC directives and related code removed
142!
143! 2050 2016-11-08 15:00:55Z gronemeier
144! Implement turbulent outflow condition
145!
146! 2031 2016-10-21 15:11:58Z knoop
147! renamed variable rho to rho_ocean
148!
149! 2011 2016-09-19 17:29:57Z kanani
150! Flag urban_surface is now defined in module control_parameters,
151! removed commented CALLs of global_min_max.
152!
153! 2007 2016-08-24 15:47:17Z kanani
154! Added CALLs for new urban surface model
155!
156! 2000 2016-08-20 18:09:15Z knoop
157! Forced header and separation lines into 80 columns
158!
159! 1976 2016-07-27 13:28:04Z maronga
160! Simplified calls to radiation model
161!
162! 1960 2016-07-12 16:34:24Z suehring
163! Separate humidity and passive scalar
164!
165! 1957 2016-07-07 10:43:48Z suehring
166! flight module added
167!
168! 1919 2016-05-27 14:51:23Z raasch
169! Initial version of purely vertical nesting introduced.
170!
171! 1918 2016-05-27 14:35:57Z raasch
172! determination of time step moved to the end of the time step loop,
173! the first time step is now always calculated before the time step loop (i.e.
174! also in case of restart runs)
175!
176! 1914 2016-05-26 14:44:07Z witha
177! Added call for wind turbine model
178!
179! 1878 2016-04-19 12:30:36Z hellstea
180! Synchronization for nested runs rewritten
181!
182! 1853 2016-04-11 09:00:35Z maronga
183! Adjusted for use with radiation_scheme = constant
184!
185! 1849 2016-04-08 11:33:18Z hoffmann
186! Adapted for modularization of microphysics
187!
188! 1833 2016-04-07 14:23:03Z raasch
189! spectrum renamed spectra_mod, spectra related variables moved to spectra_mod
190!
191! 1831 2016-04-07 13:15:51Z hoffmann
192! turbulence renamed collision_turbulence
193!
194! 1822 2016-04-07 07:49:42Z hoffmann
195! icloud_scheme replaced by microphysics_*
196!
197! 1808 2016-04-05 19:44:00Z raasch
198! output message in case unscheduled radiation calls removed
199!
200! 1797 2016-03-21 16:50:28Z raasch
201! introduction of different datatransfer modes
202!
203! 1791 2016-03-11 10:41:25Z raasch
204! call of pmci_update_new removed
205!
206! 1786 2016-03-08 05:49:27Z raasch
207! +module spectrum
208!
209! 1783 2016-03-06 18:36:17Z raasch
210! switch back of netcdf data format for mask output moved to the mask output
211! routine
212!
213! 1781 2016-03-03 15:12:23Z raasch
214! some pmc calls removed at the beginning (before timeloop),
215! pmc initialization moved to the main program
216!
217! 1764 2016-02-28 12:45:19Z raasch
218! PMC_ACTIVE flags removed,
219! bugfix: nest synchronization after first call of timestep
220!
221! 1762 2016-02-25 12:31:13Z hellstea
222! Introduction of nested domain feature
223!
224! 1736 2015-12-04 08:56:33Z raasch
225! no perturbations added to total domain if energy limit has been set zero
226!
227! 1691 2015-10-26 16:17:44Z maronga
228! Added option for spin-ups without land surface and radiation models. Moved calls
229! for radiation and lan surface schemes.
230!
231! 1682 2015-10-07 23:56:08Z knoop
232! Code annotations made doxygen readable
233!
234! 1671 2015-09-25 03:29:37Z raasch
235! bugfix: ghostpoint exchange for array diss in case that sgs velocities are used
236! for particles
237!
238! 1585 2015-04-30 07:05:52Z maronga
239! Moved call of radiation scheme. Added support for RRTM
240!
241! 1551 2015-03-03 14:18:16Z maronga
242! Added interface for different radiation schemes.
243!
244! 1496 2014-12-02 17:25:50Z maronga
245! Added calls for the land surface model and radiation scheme
246!
247! 1402 2014-05-09 14:25:13Z raasch
248! location messages modified
249!
250! 1384 2014-05-02 14:31:06Z raasch
251! location messages added
252!
253! 1380 2014-04-28 12:40:45Z heinze
254! CALL of nudge_ref added
255! bc_pt_t_val and bc_q_t_val are updated in case nudging is used
256!
257! 1365 2014-04-22 15:03:56Z boeske
258! Reset sums_ls_l to zero at each timestep
259! +sums_ls_l
260! Calculation of reference state (previously in subroutine calc_mean_profile)
261
262! 1342 2014-03-26 17:04:47Z kanani
263! REAL constants defined as wp-kind
264!
265! 1320 2014-03-20 08:40:49Z raasch
266! ONLY-attribute added to USE-statements,
267! kind-parameters added to all INTEGER and REAL declaration statements,
268! kinds are defined in new module kinds,
269! old module precision_kind is removed,
270! revision history before 2012 removed,
271! comment fields (!:) to be used for variable explanations added to
272! all variable declaration statements
273! 1318 2014-03-17 13:35:16Z raasch
274! module interfaces removed
275!
276! 1308 2014-03-13 14:58:42Z fricke
277! +netcdf_data_format_save
278! For masked data, parallel netcdf output is not tested so far, hence
279! netcdf_data_format is switched back to non-paralell output.
280!
281! 1276 2014-01-15 13:40:41Z heinze
282! Use LSF_DATA also in case of Dirichlet bottom boundary condition for scalars
283!
284! 1257 2013-11-08 15:18:40Z raasch
285! acc-update-host directive for timestep removed
286!
287! 1241 2013-10-30 11:36:58Z heinze
288! Generalize calc_mean_profile for wider use
289! Determine shf and qsws in dependence on data from LSF_DATA
290! Determine ug and vg in dependence on data from LSF_DATA
291! 1221 2013-09-10 08:59:13Z raasch
292! host update of arrays before timestep is called
293!
294! 1179 2013-06-14 05:57:58Z raasch
295! mean profiles for reference state are only calculated if required,
296! small bugfix for background communication
297!
298! 1171 2013-05-30 11:27:45Z raasch
299! split of prognostic_equations deactivated (comment lines), for the time being
300!
301! 1128 2013-04-12 06:19:32Z raasch
302! asynchronous transfer of ghost point data realized for acc-optimized version:
303! prognostic_equations are first called two times for those points required for
304! the left-right and north-south exchange, respectively, and then for the
305! remaining points,
306! those parts requiring global communication moved from prognostic_equations to
307! here
308!
309! 1115 2013-03-26 18:16:16Z hoffmann
310! calculation of qr and nr is restricted to precipitation
311!
312! 1113 2013-03-10 02:48:14Z raasch
313! GPU-porting of boundary conditions,
314! openACC directives updated
315! formal parameter removed from routine boundary_conds
316!
317! 1111 2013-03-08 23:54:10Z raasch
318! +internal timestep counter for cpu statistics added,
319! openACC directives updated
320!
321! 1092 2013-02-02 11:24:22Z raasch
322! unused variables removed
323!
324! 1065 2012-11-22 17:42:36Z hoffmann
325! exchange of diss (dissipation rate) in case of turbulence = .TRUE. added
326!
327! 1053 2012-11-13 17:11:03Z hoffmann
328! exchange of ghost points for nr, qr added
329!
330! 1036 2012-10-22 13:43:42Z raasch
331! code put under GPL (PALM 3.9)
332!
333! 1019 2012-09-28 06:46:45Z raasch
334! non-optimized version of prognostic_equations removed
335!
336! 1015 2012-09-27 09:23:24Z raasch
337! +call of prognostic_equations_acc
338!
339! 1001 2012-09-13 14:08:46Z raasch
340! all actions concerning leapfrog- and upstream-spline-scheme removed
341!
342! 849 2012-03-15 10:35:09Z raasch
343! advec_particles renamed lpm, first_call_advec_particles renamed first_call_lpm
344!
345! 825 2012-02-19 03:03:44Z raasch
346! wang_collision_kernel renamed wang_kernel
347!
348! Revision 1.1  1997/08/11 06:19:04  raasch
349! Initial revision
350!
351!
352! Description:
353! ------------
354!> Integration in time of the model equations, statistical analysis and graphic
355!> output
356!------------------------------------------------------------------------------!
357 SUBROUTINE time_integration
358 
359
360    USE advec_ws,                                                              &
361        ONLY:  ws_statistics
362
363    USE arrays_3d,                                                             &
364        ONLY:  diss, diss_p, dzu, e, e_p, nc, nc_p, nr, nr_p, prho, pt, pt_p, pt_init, &
365               q_init, q, qc, qc_p, ql, ql_c, ql_v, ql_vp, qr, qr_p, q_p,      &
366               ref_state, rho_ocean, s, s_p, sa_p, tend, u, u_p, v, vpt,       &
367               v_p, w, w_p
368
369    USE calc_mean_profile_mod,                                                 &
370        ONLY:  calc_mean_profile
371
372    USE chemistry_model_mod,                                                   &
373        ONLY:  chem_emissions, chem_species
374
375    USE chem_modules,                                                          &
376        ONLY:  nspec 
377
378    USE control_parameters,                                                    &
379        ONLY:  advected_distance_x, advected_distance_y, air_chemistry,        &
380               average_count_3d, averaging_interval, averaging_interval_pr,    &
381               bc_lr_cyc, bc_ns_cyc, bc_pt_t_val, bc_q_t_val,                  &
382               call_psolver_at_all_substeps,  child_domain, cloud_droplets,    &
383               cloud_physics, constant_flux_layer, constant_heatflux,          &
384               create_disturbances, dopr_n, constant_diffusion, coupling_mode, &
385               coupling_start_time, current_timestep_number,                   &
386               disturbance_created, disturbance_energy_limit, dist_range,      &
387               do_sum, dt_3d, dt_averaging_input, dt_averaging_input_pr,       &
388               dt_coupling, dt_data_output_av, dt_disturb, dt_do2d_xy,         &
389               dt_do2d_xz, dt_do2d_yz, dt_do3d, dt_domask,dt_dopts, dt_dopr,   &
390               dt_dopr_listing, dt_dots, dt_dvrp, dt_run_control, end_time,    &
391               first_call_lpm, first_call_mas, galilei_transformation,         &
392               humidity, intermediate_timestep_count,                          &
393               intermediate_timestep_count_max,                                &
394               land_surface, large_scale_forcing,                              &
395               loop_optimization, lsf_surf, lsf_vert, masks,                   &
396               microphysics_morrison, microphysics_seifert, mid,               &
397               multi_agent_system_end, multi_agent_system_start,               &
398               nesting_offline, neutral, nr_timesteps_this_run, nudging,       &
399               ocean, passive_scalar, prho_reference, pt_reference,            &
400               pt_slope_offset, random_heatflux, rans_mode,                    &
401               rans_tke_e, run_coupled, simulated_time, simulated_time_chr,    &
402               skip_time_do2d_xy, skip_time_do2d_xz, skip_time_do2d_yz,        &
403               skip_time_do3d, skip_time_domask, skip_time_dopr,               &
404               skip_time_data_output_av, sloping_surface,                      &
405               stop_dt, terminate_coupled, terminate_run, timestep_scheme,     &
406               time_coupling, time_do2d_xy, time_do2d_xz, time_do2d_yz,        &
407               time_do3d, time_domask, time_dopr, time_dopr_av,                &
408               time_dopr_listing, time_dopts, time_dosp, time_dosp_av,         &
409               time_dots, time_do_av, time_do_sla, time_disturb, time_dvrp,    &
410               time_run_control, time_since_reference_point,                   &
411               turbulent_inflow, turbulent_outflow, urban_surface,             &
412               use_initial_profile_as_reference,                               &
413               use_single_reference_value, uv_exposure, u_gtrans, v_gtrans,    &
414               virtual_flight, wind_turbine, ws_scheme_mom, ws_scheme_sca
415
416    USE cpulog,                                                                &
417        ONLY:  cpu_log, log_point, log_point_s
418
419    USE flight_mod,                                                            &
420        ONLY:  flight_measurement
421
422    USE gust_mod,                                                              &
423        ONLY:  gust_actions, gust_module_enabled
424
425    USE indices,                                                               &
426        ONLY:  nbgp, nx, nxl, nxlg, nxr, nxrg, nzb, nzt
427
428    USE interaction_droplets_ptq_mod,                                          &
429        ONLY:  interaction_droplets_ptq
430
431    USE interfaces
432
433    USE kinds
434
435    USE land_surface_model_mod,                                                &
436        ONLY:  lsm_boundary_condition, lsm_energy_balance, lsm_soil_model,     &
437               skip_time_do_lsm
438
439    USE lsf_nudging_mod,                                                       &
440        ONLY:  calc_tnudge, ls_forcing_surf, ls_forcing_vert, nudge_ref,       &
441               lsf_nesting_offline, lsf_nesting_offline_mass_conservation
442
443    USE microphysics_mod,                                                      &
444        ONLY: collision_turbulence
445
446    USE netcdf_data_input_mod,                                                 &
447        ONLY:  nest_offl, netcdf_data_input_lsf
448
449    USE multi_agent_system_mod,                                                &
450        ONLY:  agents_active, multi_agent_system
451
452    USE particle_attributes,                                                   &
453        ONLY:  particle_advection, particle_advection_start,                   &
454               use_sgs_for_particles, wang_kernel
455
456    USE pegrid
457
458    USE pmc_interface,                                                         &
459        ONLY:  nested_run, nesting_mode, pmci_boundary_conds, pmci_datatrans,  &
460               pmci_ensure_nest_mass_conservation, pmci_synchronize
461
462    USE progress_bar,                                                          &
463        ONLY:  finish_progress_bar, output_progress_bar
464
465    USE prognostic_equations_mod,                                              &
466        ONLY:  prognostic_equations_cache, prognostic_equations_vector
467
468    USE radiation_model_mod,                                                   &
469        ONLY: dt_radiation, force_radiation_call, radiation, radiation_control,&
470              radiation_interaction, radiation_interactions,                   &
471              skip_time_do_radiation, time_radiation
472
473    USE spectra_mod,                                                           &
474        ONLY: average_count_sp, averaging_interval_sp, calc_spectra, dt_dosp,  &
475              skip_time_dosp
476
477    USE statistics,                                                            &
478        ONLY:  flow_statistics_called, hom, pr_palm, sums_ls_l
479
480    USE surface_layer_fluxes_mod,                                              &
481        ONLY:  surface_layer_fluxes
482
483    USE surface_mod,                                                           &
484        ONLY:  surf_def_h, surf_lsm_h, surf_usm_h
485
486    USE turbulence_closure_mod,                                                &
487        ONLY:  tcm_diffusivities, production_e_init
488
489    USE urban_surface_mod,                                                     &
490        ONLY:  usm_boundary_condition, usm_material_heat_model,                &
491               usm_material_model,                                             &
492               usm_surface_energy_balance, usm_green_heat_model,               &
493               usm_temperature_near_surface
494
495    USE synthetic_turbulence_generator_mod,                                    &
496        ONLY:  stg_main, use_syn_turb_gen
497
498    USE user_actions_mod,                                                      &
499        ONLY:  user_actions
500
501    USE uv_exposure_model_mod,                                                 &
502        ONLY:  uvem_calc_exposure
503
504    USE wind_turbine_model_mod,                                                &
505        ONLY:  wtm_forces
506
507    USE lpm_mod,                                                               &
508        ONLY:  lpm
509
510    USE vertical_nesting_mod,                                                  &
511        ONLY:  vnested, vnest_anterpolate, vnest_anterpolate_e,                &
512               vnest_boundary_conds, vnest_boundary_conds_khkm,                & 
513               vnest_deallocate, vnest_init, vnest_init_fine,                  &
514               vnest_start_time
515
516    IMPLICIT NONE
517
518    CHARACTER (LEN=9) ::  time_to_string          !<
519
520    INTEGER(iwp)      ::  n  !< loop counter for chemistry species
521
522    REAL(wp) ::  dt_3d_old  !< temporary storage of timestep to be used for
523                            !< steering of run control output interval
524    REAL(wp) ::  time_since_reference_point_save  !< original value of
525                                                  !< time_since_reference_point
526
527!
528!-- At beginning determine the first time step
529    CALL timestep
530!
531!-- Synchronize the timestep in case of nested run.
532    IF ( nested_run )  THEN
533!
534!--    Synchronization by unifying the time step.
535!--    Global minimum of all time-steps is used for all.
536       CALL pmci_synchronize
537    ENDIF
538
539!
540!-- Determine and print out the run control quantities before the first time
541!-- step of this run. For the initial run, some statistics (e.g. divergence)
542!-- need to be determined first --> CALL flow_statistics at the beginning of
543!-- run_control
544    CALL run_control
545!
546!-- Data exchange between coupled models in case that a call has been omitted
547!-- at the end of the previous run of a job chain.
548    IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled .AND. .NOT. vnested)  THEN
549!
550!--    In case of model termination initiated by the local model the coupler
551!--    must not be called because this would again cause an MPI hang.
552       DO WHILE ( time_coupling >= dt_coupling  .AND.  terminate_coupled == 0 )
553          CALL surface_coupler
554          time_coupling = time_coupling - dt_coupling
555       ENDDO
556       IF (time_coupling == 0.0_wp  .AND.                                      &
557           time_since_reference_point < dt_coupling )                          &
558       THEN
559          time_coupling = time_since_reference_point
560       ENDIF
561    ENDIF
562
563#if defined( __dvrp_graphics )
564!
565!-- Time measurement with dvrp software 
566    CALL DVRP_LOG_EVENT( 2, current_timestep_number )
567#endif
568
569    CALL location_message( 'starting timestep-sequence', .TRUE. )
570!
571!-- Start of the time loop
572    DO  WHILE ( simulated_time < end_time  .AND.  .NOT. stop_dt  .AND. &
573                .NOT. terminate_run )
574
575       CALL cpu_log( log_point_s(10), 'timesteps', 'start' )
576!
577!--    Vertical nesting: initialize fine grid
578       IF ( vnested ) THEN
579          IF ( .NOT. vnest_init  .AND.  simulated_time >= vnest_start_time )  THEN
580             CALL cpu_log( log_point(80), 'vnest_init', 'start' )
581             CALL vnest_init_fine
582             vnest_init = .TRUE.
583             CALL cpu_log( log_point(80), 'vnest_init', 'stop' )
584          ENDIF
585       ENDIF
586!
587!--    Determine ug, vg and w_subs in dependence on data from external file
588!--    LSF_DATA
589       IF ( large_scale_forcing .AND. lsf_vert )  THEN
590           CALL ls_forcing_vert ( simulated_time )
591           sums_ls_l = 0.0_wp
592       ENDIF
593
594!
595!--    Set pt_init and q_init to the current profiles taken from
596!--    NUDGING_DATA
597       IF ( nudging )  THEN
598           CALL nudge_ref ( simulated_time )
599!
600!--        Store temperature gradient at the top boundary for possible Neumann
601!--        boundary condition
602           bc_pt_t_val = ( pt_init(nzt+1) - pt_init(nzt) ) / dzu(nzt+1)
603           bc_q_t_val  = ( q_init(nzt+1) - q_init(nzt) ) / dzu(nzt+1)
604       ENDIF
605!
606!--    If forcing by larger-scale models is applied, check if new data
607!--    at domain boundaries need to be read.
608       IF ( nesting_offline )  THEN
609          IF ( nest_offl%time(nest_offl%tind_p) <= time_since_reference_point )&
610             CALL netcdf_data_input_lsf
611       ENDIF
612
613!
614!--    Execute the gust module actions
615       IF ( gust_module_enabled )  THEN
616          CALL gust_actions( 'before_timestep' )
617       ENDIF
618
619!
620!--    Execute the user-defined actions
621       CALL user_actions( 'before_timestep' )
622
623!
624!--    Calculate forces by wind turbines
625       IF ( wind_turbine )  THEN
626
627          CALL cpu_log( log_point(55), 'wind_turbine', 'start' )
628
629          CALL wtm_forces
630
631          CALL cpu_log( log_point(55), 'wind_turbine', 'stop' )
632
633       ENDIF       
634       
635!
636!--    Start of intermediate step loop
637       intermediate_timestep_count = 0
638       DO  WHILE ( intermediate_timestep_count < &
639                   intermediate_timestep_count_max )
640
641          intermediate_timestep_count = intermediate_timestep_count + 1
642
643!
644!--       Set the steering factors for the prognostic equations which depend
645!--       on the timestep scheme
646          CALL timestep_scheme_steering
647
648!
649!--       Calculate those variables needed in the tendency terms which need
650!--       global communication
651          IF ( .NOT. use_single_reference_value  .AND. &
652               .NOT. use_initial_profile_as_reference )  THEN
653!
654!--          Horizontally averaged profiles to be used as reference state in
655!--          buoyancy terms (WARNING: only the respective last call of
656!--          calc_mean_profile defines the reference state!)
657             IF ( .NOT. neutral )  THEN
658                CALL calc_mean_profile( pt, 4 )
659                ref_state(:)  = hom(:,1,4,0) ! this is used in the buoyancy term
660             ENDIF
661             IF ( ocean )  THEN
662                CALL calc_mean_profile( rho_ocean, 64 )
663                ref_state(:)  = hom(:,1,64,0)
664             ENDIF
665             IF ( humidity )  THEN
666                CALL calc_mean_profile( vpt, 44 )
667                ref_state(:)  = hom(:,1,44,0)
668             ENDIF
669!
670!--          Assure that ref_state does not become zero at any level
671!--          ( might be the case if a vertical level is completely occupied
672!--            with topography ).
673             ref_state = MERGE( MAXVAL(ref_state), ref_state,                  &
674                                ref_state == 0.0_wp )
675          ENDIF
676
677          IF ( .NOT. constant_diffusion )  CALL production_e_init
678          IF ( ( ws_scheme_mom .OR. ws_scheme_sca )  .AND.  &
679               intermediate_timestep_count == 1 )  CALL ws_statistics
680!
681!--       In case of nudging calculate current nudging time scale and horizontal
682!--       means of u, v, pt and q
683          IF ( nudging )  THEN
684             CALL calc_tnudge( simulated_time )
685             CALL calc_mean_profile( u, 1 )
686             CALL calc_mean_profile( v, 2 )
687             CALL calc_mean_profile( pt, 4 )
688             CALL calc_mean_profile( q, 41 )
689          ENDIF
690
691!
692!--       Solve the prognostic equations. A fast cache optimized version with
693!--       only one single loop is used in case of Piascek-Williams advection
694!--       scheme. NEC vector machines use a different version, because
695!--       in the other versions a good vectorization is prohibited due to
696!--       inlining problems.
697          IF ( loop_optimization == 'cache' )  THEN
698             CALL prognostic_equations_cache
699          ELSEIF ( loop_optimization == 'vector' )  THEN
700             CALL prognostic_equations_vector
701          ENDIF
702
703!
704!--       Particle transport/physics with the Lagrangian particle model
705!--       (only once during intermediate steps, because it uses an Euler-step)
706!--       ### particle model should be moved before prognostic_equations, in order
707!--       to regard droplet interactions directly
708          IF ( particle_advection  .AND.                         &
709               simulated_time >= particle_advection_start  .AND. &
710               intermediate_timestep_count == 1 )  THEN
711             CALL lpm
712             first_call_lpm = .FALSE.
713          ENDIF
714
715!
716!--       Interaction of droplets with temperature and mixing ratio.
717!--       Droplet condensation and evaporation is calculated within
718!--       advec_particles.
719          IF ( cloud_droplets  .AND.  &
720               intermediate_timestep_count == intermediate_timestep_count_max )&
721          THEN
722             CALL interaction_droplets_ptq
723          ENDIF
724
725!
726!--       Movement of agents in multi agent system
727          IF ( agents_active  .AND.                                            &
728               time_since_reference_point >= multi_agent_system_start  .AND.   &
729               time_since_reference_point <= multi_agent_system_end    .AND.   &
730               intermediate_timestep_count == 1 )  THEN
731             CALL multi_agent_system
732             first_call_mas = .FALSE.
733          ENDIF
734
735!
736!--       Exchange of ghost points (lateral boundary conditions)
737          CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'start' )
738
739          CALL exchange_horiz( u_p, nbgp )
740          CALL exchange_horiz( v_p, nbgp )
741          CALL exchange_horiz( w_p, nbgp )
742          CALL exchange_horiz( pt_p, nbgp )
743          IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e_p, nbgp )
744          IF ( rans_tke_e  .OR.  wang_kernel  .OR.  collision_turbulence       &
745               .OR.  use_sgs_for_particles )  THEN
746             IF ( rans_tke_e )  THEN
747                CALL exchange_horiz( diss_p, nbgp )
748             ELSE
749                CALL exchange_horiz( diss, nbgp )
750             ENDIF
751          ENDIF
752          IF ( ocean )  THEN
753             CALL exchange_horiz( sa_p, nbgp )
754             CALL exchange_horiz( rho_ocean, nbgp )
755             CALL exchange_horiz( prho, nbgp )
756          ENDIF
757          IF ( humidity )  THEN
758             CALL exchange_horiz( q_p, nbgp )
759             IF ( cloud_physics .AND. microphysics_morrison )  THEN
760                CALL exchange_horiz( qc_p, nbgp )
761                CALL exchange_horiz( nc_p, nbgp )
762             ENDIF
763             IF ( cloud_physics .AND. microphysics_seifert )  THEN
764                CALL exchange_horiz( qr_p, nbgp )
765                CALL exchange_horiz( nr_p, nbgp )
766             ENDIF
767          ENDIF
768          IF ( cloud_droplets )  THEN
769             CALL exchange_horiz( ql, nbgp )
770             CALL exchange_horiz( ql_c, nbgp )
771             CALL exchange_horiz( ql_v, nbgp )
772             CALL exchange_horiz( ql_vp, nbgp )
773          ENDIF
774          IF ( passive_scalar )  CALL exchange_horiz( s_p, nbgp )
775          IF ( air_chemistry )  THEN
776             DO  n = 1, nspec     
777                CALL exchange_horiz( chem_species(n)%conc_p, nbgp ) 
778             ENDDO
779          ENDIF
780
781          CALL cpu_log( log_point(26), 'exchange-horiz-progn', 'stop' )
782
783!
784!--       Boundary conditions for the prognostic quantities (except of the
785!--       velocities at the outflow in case of a non-cyclic lateral wall)
786          CALL boundary_conds
787!
788!--       Swap the time levels in preparation for the next time step.
789          CALL swap_timelevel
790
791!
792!--       Vertical nesting: Interpolate fine grid data to the coarse grid
793          IF ( vnest_init ) THEN
794             CALL cpu_log( log_point(81), 'vnest_anterpolate', 'start' )
795             CALL vnest_anterpolate
796             CALL cpu_log( log_point(81), 'vnest_anterpolate', 'stop' )
797          ENDIF
798
799          IF ( nested_run )  THEN
800
801             CALL cpu_log( log_point(60), 'nesting', 'start' )
802!
803!--          Domain nesting. The data transfer subroutines pmci_parent_datatrans
804!--          and pmci_child_datatrans are called inside the wrapper
805!--          subroutine pmci_datatrans according to the control parameters
806!--          nesting_mode and nesting_datatransfer_mode.
807!--          TO_DO: why is nesting_mode given as a parameter here?
808             CALL pmci_datatrans( nesting_mode )
809
810             IF ( TRIM( nesting_mode ) == 'two-way' .OR.                       &
811                  nesting_mode == 'vertical' )  THEN
812!
813!--             Exchange_horiz is needed for all parent-domains after the
814!--             anterpolation
815                CALL exchange_horiz( u, nbgp )
816                CALL exchange_horiz( v, nbgp )
817                CALL exchange_horiz( w, nbgp )
818                IF ( .NOT. neutral )  CALL exchange_horiz( pt, nbgp )
819
820                IF ( humidity )  THEN
821
822                   CALL exchange_horiz( q, nbgp )
823
824                   IF ( cloud_physics  .AND.  microphysics_morrison )  THEN
825                       CALL exchange_horiz( qc, nbgp )
826                       CALL exchange_horiz( nc, nbgp )
827                   ENDIF
828                   IF ( cloud_physics  .AND.  microphysics_seifert )  THEN
829                       CALL exchange_horiz( qr, nbgp )
830                       CALL exchange_horiz( nr, nbgp )
831                   ENDIF
832
833                ENDIF
834
835                IF ( passive_scalar )  CALL exchange_horiz( s, nbgp )
836                IF ( .NOT. constant_diffusion )  CALL exchange_horiz( e, nbgp )
837
838                IF ( .NOT. constant_diffusion  .AND.  rans_mode  .AND.         &
839                                                      rans_tke_e )             &
840                   CALL exchange_horiz( diss, nbgp )
841
842                IF ( air_chemistry )  THEN
843                   DO  n = 1, nspec     
844                      CALL exchange_horiz( chem_species(n)%conc, nbgp ) 
845                   ENDDO
846                ENDIF
847
848             ENDIF
849!
850!--          Set boundary conditions again after interpolation and anterpolation.
851             CALL pmci_boundary_conds
852!
853!--          Correct the w top-BC in nest domains to ensure mass conservation.
854!--          This action must never be done for the root domain. Vertical
855!--          nesting implies mass conservation.
856!--          Commented out April 18, 2018 as seemingly unnecessary.
857!--          Will later be completely removed.
858!--             IF ( child_domain )  THEN
859!--                CALL pmci_ensure_nest_mass_conservation
860!--             ENDIF
861
862
863             CALL cpu_log( log_point(60), 'nesting', 'stop' )
864
865          ENDIF
866
867!
868!--       Temperature offset must be imposed at cyclic boundaries in x-direction
869!--       when a sloping surface is used
870          IF ( sloping_surface )  THEN
871             IF ( nxl ==  0 )  pt(:,:,nxlg:nxl-1) = pt(:,:,nxlg:nxl-1) - &
872                                                    pt_slope_offset
873             IF ( nxr == nx )  pt(:,:,nxr+1:nxrg) = pt(:,:,nxr+1:nxrg) + &
874                                                    pt_slope_offset
875          ENDIF
876
877!
878!--       Impose a turbulent inflow using the recycling method
879          IF ( turbulent_inflow )  CALL  inflow_turbulence
880
881!
882!--       Impose a turbulent inflow using synthetic generated turbulence
883          IF ( use_syn_turb_gen )  CALL  stg_main
884
885!
886!--       Set values at outflow boundary using the special outflow condition
887          IF ( turbulent_outflow )  CALL  outflow_turbulence
888
889!
890!--       Impose a random perturbation on the horizontal velocity field
891          IF ( create_disturbances  .AND.                                      &
892               ( call_psolver_at_all_substeps  .AND.                           &
893               intermediate_timestep_count == intermediate_timestep_count_max )&
894          .OR. ( .NOT. call_psolver_at_all_substeps  .AND.                     &
895               intermediate_timestep_count == 1 ) )                            &
896          THEN
897             time_disturb = time_disturb + dt_3d
898             IF ( time_disturb >= dt_disturb )  THEN
899                IF ( disturbance_energy_limit /= 0.0_wp  .AND.                 &
900                     hom(nzb+5,1,pr_palm,0) < disturbance_energy_limit )  THEN
901                   CALL disturb_field( 'u', tend, u )
902                   CALL disturb_field( 'v', tend, v )
903                ELSEIF ( ( .NOT. bc_lr_cyc  .OR.  .NOT. bc_ns_cyc )            &
904                     .AND. .NOT. child_domain  .AND.  .NOT.  nesting_offline )  &
905                THEN
906!
907!--                Runs with a non-cyclic lateral wall need perturbations
908!--                near the inflow throughout the whole simulation
909                   dist_range = 1
910                   CALL disturb_field( 'u', tend, u )
911                   CALL disturb_field( 'v', tend, v )
912                   dist_range = 0
913                ENDIF
914                time_disturb = time_disturb - dt_disturb
915             ENDIF
916          ENDIF
917
918!
919!--       Map forcing data derived from larger scale model onto domain
920!--       boundaries.
921          IF ( nesting_offline  .AND.  intermediate_timestep_count ==          &
922                                       intermediate_timestep_count_max  )  THEN
923             CALL lsf_nesting_offline
924!
925!--          Moreover, ensure mass conservation
926             CALL lsf_nesting_offline_mass_conservation
927          ENDIF
928
929!
930!--       Reduce the velocity divergence via the equation for perturbation
931!--       pressure.
932          IF ( intermediate_timestep_count == 1  .OR. &
933                call_psolver_at_all_substeps )  THEN
934
935             IF (  vnest_init ) THEN
936!
937!--             Compute pressure in the CG, interpolate top boundary conditions
938!--             to the FG and then compute pressure in the FG
939                IF ( coupling_mode == 'vnested_crse' )  CALL pres
940
941                CALL cpu_log( log_point(82), 'vnest_bc', 'start' )
942                CALL vnest_boundary_conds
943                CALL cpu_log( log_point(82), 'vnest_bc', 'stop' )
944 
945                IF ( coupling_mode == 'vnested_fine' )  CALL pres
946
947!--             Anterpolate TKE, satisfy Germano Identity
948                CALL cpu_log( log_point(83), 'vnest_anter_e', 'start' )
949                CALL vnest_anterpolate_e
950                CALL cpu_log( log_point(83), 'vnest_anter_e', 'stop' )
951
952             ELSE
953
954                CALL pres
955
956             ENDIF
957
958          ENDIF
959
960!
961!--       If required, compute liquid water content
962          IF ( cloud_physics )  THEN
963             CALL calc_liquid_water_content
964          ENDIF
965!
966!--       If required, compute virtual potential temperature
967          IF ( humidity )  THEN
968             CALL compute_vpt 
969          ENDIF 
970
971!
972!--       Compute the diffusion quantities
973          IF ( .NOT. constant_diffusion )  THEN
974
975!
976!--          Determine surface fluxes shf and qsws and surface values
977!--          pt_surface and q_surface in dependence on data from external
978!--          file LSF_DATA respectively
979             IF ( ( large_scale_forcing .AND. lsf_surf ) .AND. &
980                 intermediate_timestep_count == intermediate_timestep_count_max )&
981             THEN
982                CALL ls_forcing_surf( simulated_time )
983             ENDIF
984
985!
986!--          First the vertical (and horizontal) fluxes in the surface
987!--          (constant flux) layer are computed
988             IF ( constant_flux_layer )  THEN
989                CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'start' )
990                CALL surface_layer_fluxes
991                CALL cpu_log( log_point(19), 'surface_layer_fluxes', 'stop' )
992             ENDIF
993!
994!--          If required, solve the energy balance for the surface and run soil
995!--          model. Call for horizontal as well as vertical surfaces
996             IF ( land_surface .AND. time_since_reference_point >= skip_time_do_lsm)  THEN
997
998                CALL cpu_log( log_point(54), 'land_surface', 'start' )
999!
1000!--             Call for horizontal upward-facing surfaces
1001                CALL lsm_energy_balance( .TRUE., -1 )
1002                CALL lsm_soil_model( .TRUE., -1, .TRUE. )
1003!
1004!--             Call for northward-facing surfaces
1005                CALL lsm_energy_balance( .FALSE., 0 )
1006                CALL lsm_soil_model( .FALSE., 0, .TRUE. )
1007!
1008!--             Call for southward-facing surfaces
1009                CALL lsm_energy_balance( .FALSE., 1 )
1010                CALL lsm_soil_model( .FALSE., 1, .TRUE. )
1011!
1012!--             Call for eastward-facing surfaces
1013                CALL lsm_energy_balance( .FALSE., 2 )
1014                CALL lsm_soil_model( .FALSE., 2, .TRUE. )
1015!
1016!--             Call for westward-facing surfaces
1017                CALL lsm_energy_balance( .FALSE., 3 )
1018                CALL lsm_soil_model( .FALSE., 3, .TRUE. )
1019!
1020!--             At the end, set boundary conditons for potential temperature
1021!--             and humidity after running the land-surface model. This
1022!--             might be important for the nesting, where arrays are transfered.
1023                CALL lsm_boundary_condition
1024
1025                CALL cpu_log( log_point(54), 'land_surface', 'stop' )
1026             ENDIF
1027!
1028!--          If required, solve the energy balance for urban surfaces and run
1029!--          the material heat model
1030             IF (urban_surface) THEN
1031                CALL cpu_log( log_point(74), 'urban_surface', 'start' )
1032               
1033                CALL usm_surface_energy_balance
1034                IF ( usm_material_model )  THEN
1035                   CALL usm_green_heat_model
1036                   CALL usm_material_heat_model
1037                ENDIF
1038
1039                CALL usm_temperature_near_surface
1040!
1041!--             At the end, set boundary conditons for potential temperature
1042!--             and humidity after running the urban-surface model. This
1043!--             might be important for the nesting, where arrays are transfered.
1044                CALL usm_boundary_condition
1045
1046                CALL cpu_log( log_point(74), 'urban_surface', 'stop' )
1047             ENDIF
1048!
1049!--          Compute the diffusion coefficients
1050             CALL cpu_log( log_point(17), 'diffusivities', 'start' )
1051             IF ( .NOT. humidity ) THEN
1052                IF ( ocean )  THEN
1053                   CALL tcm_diffusivities( prho, prho_reference )
1054                ELSE
1055                   CALL tcm_diffusivities( pt, pt_reference )
1056                ENDIF
1057             ELSE
1058                CALL tcm_diffusivities( vpt, pt_reference )
1059             ENDIF
1060             CALL cpu_log( log_point(17), 'diffusivities', 'stop' )
1061!
1062!--          Vertical nesting: set fine grid eddy viscosity top boundary condition
1063             IF ( vnest_init )  CALL vnest_boundary_conds_khkm
1064
1065          ENDIF
1066
1067!
1068!--       If required, calculate radiative fluxes and heating rates
1069          IF ( radiation .AND. intermediate_timestep_count                     &
1070               == intermediate_timestep_count_max .AND. time_since_reference_point >    &
1071               skip_time_do_radiation )  THEN
1072
1073               time_radiation = time_radiation + dt_3d
1074
1075             IF ( time_radiation >= dt_radiation .OR. force_radiation_call )   &
1076             THEN
1077
1078                CALL cpu_log( log_point(50), 'radiation', 'start' )
1079
1080                IF ( .NOT. force_radiation_call )  THEN
1081                   time_radiation = time_radiation - dt_radiation
1082                ENDIF
1083
1084!
1085!--             Adjust the current time to the time step of the radiation model.
1086!--             Needed since radiation is pre-calculated and stored only on apparent
1087!--             solar positions
1088                time_since_reference_point_save = time_since_reference_point
1089                time_since_reference_point =                                   &
1090                                    REAL( FLOOR( time_since_reference_point /  &
1091                                                 dt_radiation), wp )           &
1092                                             * dt_radiation
1093
1094                CALL radiation_control
1095
1096                CALL cpu_log( log_point(50), 'radiation', 'stop' )
1097
1098                IF ( urban_surface  .OR.  land_surface  .AND.                  &
1099                     radiation_interactions )  THEN
1100                   CALL cpu_log( log_point(75), 'radiation_interaction', 'start' )
1101                   CALL radiation_interaction
1102                   CALL cpu_log( log_point(75), 'radiation_interaction', 'stop' )
1103                ENDIF
1104   
1105!
1106!--             Return the current time to its original value
1107                time_since_reference_point = time_since_reference_point_save
1108
1109             ENDIF
1110          ENDIF
1111
1112       ENDDO   ! Intermediate step loop
1113!
1114!--    If required, consider chemical emissions
1115!--    (todo (FK): Implement hourly call of emissions, using time_utc from
1116!--                data_and_time_mod.f90;
1117!--                move the CALL to appropriate location)
1118       IF ( air_chemistry ) THEN
1119          CALL chem_emissions
1120       ENDIF
1121!
1122!--    If required, do UV exposure calculations
1123       IF ( uv_exposure )  THEN
1124          CALL uvem_calc_exposure
1125       ENDIF
1126!
1127!--    Increase simulation time and output times
1128       nr_timesteps_this_run      = nr_timesteps_this_run + 1
1129       current_timestep_number    = current_timestep_number + 1
1130       simulated_time             = simulated_time   + dt_3d
1131       time_since_reference_point = simulated_time - coupling_start_time
1132       simulated_time_chr         = time_to_string( time_since_reference_point )
1133
1134
1135
1136
1137       IF ( simulated_time >= skip_time_data_output_av )  THEN
1138          time_do_av         = time_do_av       + dt_3d
1139       ENDIF
1140       IF ( simulated_time >= skip_time_do2d_xy )  THEN
1141          time_do2d_xy       = time_do2d_xy     + dt_3d
1142       ENDIF
1143       IF ( simulated_time >= skip_time_do2d_xz )  THEN
1144          time_do2d_xz       = time_do2d_xz     + dt_3d
1145       ENDIF
1146       IF ( simulated_time >= skip_time_do2d_yz )  THEN
1147          time_do2d_yz       = time_do2d_yz     + dt_3d
1148       ENDIF
1149       IF ( simulated_time >= skip_time_do3d    )  THEN
1150          time_do3d          = time_do3d        + dt_3d
1151       ENDIF
1152       DO  mid = 1, masks
1153          IF ( simulated_time >= skip_time_domask(mid) )  THEN
1154             time_domask(mid)= time_domask(mid) + dt_3d
1155          ENDIF
1156       ENDDO
1157       time_dvrp          = time_dvrp        + dt_3d
1158       IF ( simulated_time >= skip_time_dosp )  THEN
1159          time_dosp       = time_dosp        + dt_3d
1160       ENDIF
1161       time_dots          = time_dots        + dt_3d
1162       IF ( .NOT. first_call_lpm )  THEN
1163          time_dopts      = time_dopts       + dt_3d
1164       ENDIF
1165       IF ( simulated_time >= skip_time_dopr )  THEN
1166          time_dopr       = time_dopr        + dt_3d
1167       ENDIF
1168       time_dopr_listing          = time_dopr_listing        + dt_3d
1169       time_run_control   = time_run_control + dt_3d
1170
1171!
1172!--    Data exchange between coupled models
1173       IF ( coupling_mode /= 'uncoupled'  .AND.  run_coupled                   &
1174                                          .AND. .NOT. vnested )  THEN
1175          time_coupling = time_coupling + dt_3d
1176
1177!
1178!--       In case of model termination initiated by the local model
1179!--       (terminate_coupled > 0), the coupler must be skipped because it would
1180!--       cause an MPI intercomminucation hang.
1181!--       If necessary, the coupler will be called at the beginning of the
1182!--       next restart run.
1183          DO WHILE ( time_coupling >= dt_coupling .AND. terminate_coupled == 0 )
1184             CALL surface_coupler
1185             time_coupling = time_coupling - dt_coupling
1186          ENDDO
1187       ENDIF
1188
1189!
1190!--    Execute the gust module actions
1191       IF ( gust_module_enabled )  THEN
1192          CALL gust_actions( 'after_integration' )
1193       ENDIF
1194
1195!
1196!--    Execute user-defined actions
1197       CALL user_actions( 'after_integration' )
1198
1199!
1200!--    If Galilei transformation is used, determine the distance that the
1201!--    model has moved so far
1202       IF ( galilei_transformation )  THEN
1203          advected_distance_x = advected_distance_x + u_gtrans * dt_3d
1204          advected_distance_y = advected_distance_y + v_gtrans * dt_3d
1205       ENDIF
1206
1207!
1208!--    Check, if restart is necessary (because cpu-time is expiring or
1209!--    because it is forced by user) and set stop flag
1210!--    This call is skipped if the remote model has already initiated a restart.
1211       IF ( .NOT. terminate_run )  CALL check_for_restart
1212
1213!
1214!--    Carry out statistical analysis and output at the requested output times.
1215!--    The MOD function is used for calculating the output time counters (like
1216!--    time_dopr) in order to regard a possible decrease of the output time
1217!--    interval in case of restart runs
1218
1219!
1220!--    Set a flag indicating that so far no statistics have been created
1221!--    for this time step
1222       flow_statistics_called = .FALSE.
1223
1224!
1225!--    If required, call flow_statistics for averaging in time
1226       IF ( averaging_interval_pr /= 0.0_wp  .AND.  &
1227            ( dt_dopr - time_dopr ) <= averaging_interval_pr  .AND.  &
1228            simulated_time >= skip_time_dopr )  THEN
1229          time_dopr_av = time_dopr_av + dt_3d
1230          IF ( time_dopr_av >= dt_averaging_input_pr )  THEN
1231             do_sum = .TRUE.
1232             time_dopr_av = MOD( time_dopr_av, &
1233                                    MAX( dt_averaging_input_pr, dt_3d ) )
1234          ENDIF
1235       ENDIF
1236       IF ( do_sum )  CALL flow_statistics
1237
1238!
1239!--    Sum-up 3d-arrays for later output of time-averaged 2d/3d/masked data
1240       IF ( averaging_interval /= 0.0_wp  .AND.                                &
1241            ( dt_data_output_av - time_do_av ) <= averaging_interval  .AND. &
1242            simulated_time >= skip_time_data_output_av )                    &
1243       THEN
1244          time_do_sla = time_do_sla + dt_3d
1245          IF ( time_do_sla >= dt_averaging_input )  THEN
1246             CALL sum_up_3d_data
1247             average_count_3d = average_count_3d + 1
1248             time_do_sla = MOD( time_do_sla, MAX( dt_averaging_input, dt_3d ) )
1249          ENDIF
1250       ENDIF
1251
1252!
1253!--    Calculate spectra for time averaging
1254       IF ( averaging_interval_sp /= 0.0_wp  .AND.  &
1255            ( dt_dosp - time_dosp ) <= averaging_interval_sp  .AND.  &
1256            simulated_time >= skip_time_dosp )  THEN
1257          time_dosp_av = time_dosp_av + dt_3d
1258          IF ( time_dosp_av >= dt_averaging_input_pr )  THEN
1259             CALL calc_spectra
1260             time_dosp_av = MOD( time_dosp_av, &
1261                                 MAX( dt_averaging_input_pr, dt_3d ) )
1262          ENDIF
1263       ENDIF
1264
1265!
1266!--    Call flight module and output data
1267       IF ( virtual_flight )  THEN
1268          CALL flight_measurement
1269          CALL data_output_flight
1270       ENDIF
1271
1272!
1273!--    Profile output (ASCII) on file
1274       IF ( time_dopr_listing >= dt_dopr_listing )  THEN
1275          CALL print_1d
1276          time_dopr_listing = MOD( time_dopr_listing, MAX( dt_dopr_listing, &
1277                                                           dt_3d ) )
1278       ENDIF
1279
1280!
1281!--    Graphic output for PROFIL
1282       IF ( time_dopr >= dt_dopr )  THEN
1283          IF ( dopr_n /= 0 )  CALL data_output_profiles
1284          time_dopr = MOD( time_dopr, MAX( dt_dopr, dt_3d ) )
1285          time_dopr_av = 0.0_wp    ! due to averaging (see above)
1286       ENDIF
1287
1288!
1289!--    Graphic output for time series
1290       IF ( time_dots >= dt_dots )  THEN
1291          CALL data_output_tseries
1292          time_dots = MOD( time_dots, MAX( dt_dots, dt_3d ) )
1293       ENDIF
1294
1295!
1296!--    Output of spectra (formatted for use with PROFIL), in case of no
1297!--    time averaging, spectra has to be calculated before
1298       IF ( time_dosp >= dt_dosp )  THEN
1299          IF ( average_count_sp == 0 )  CALL calc_spectra
1300          CALL data_output_spectra
1301          time_dosp = MOD( time_dosp, MAX( dt_dosp, dt_3d ) )
1302       ENDIF
1303
1304!
1305!--    2d-data output (cross-sections)
1306       IF ( time_do2d_xy >= dt_do2d_xy )  THEN
1307          CALL data_output_2d( 'xy', 0 )
1308          time_do2d_xy = MOD( time_do2d_xy, MAX( dt_do2d_xy, dt_3d ) )
1309       ENDIF
1310       IF ( time_do2d_xz >= dt_do2d_xz )  THEN
1311          CALL data_output_2d( 'xz', 0 )
1312          time_do2d_xz = MOD( time_do2d_xz, MAX( dt_do2d_xz, dt_3d ) )
1313       ENDIF
1314       IF ( time_do2d_yz >= dt_do2d_yz )  THEN
1315          CALL data_output_2d( 'yz', 0 )
1316          time_do2d_yz = MOD( time_do2d_yz, MAX( dt_do2d_yz, dt_3d ) )
1317       ENDIF
1318
1319!
1320!--    3d-data output (volume data)
1321       IF ( time_do3d >= dt_do3d )  THEN
1322          CALL data_output_3d( 0 )
1323          time_do3d = MOD( time_do3d, MAX( dt_do3d, dt_3d ) )
1324       ENDIF
1325
1326!
1327!--    Masked data output
1328       DO  mid = 1, masks
1329          IF ( time_domask(mid) >= dt_domask(mid) )  THEN
1330             CALL data_output_mask( 0 )
1331             time_domask(mid) = MOD( time_domask(mid),  &
1332                                     MAX( dt_domask(mid), dt_3d ) )
1333          ENDIF
1334       ENDDO
1335
1336!
1337!--    Output of time-averaged 2d/3d/masked data
1338       IF ( time_do_av >= dt_data_output_av )  THEN
1339          CALL average_3d_data
1340          CALL data_output_2d( 'xy', 1 )
1341          CALL data_output_2d( 'xz', 1 )
1342          CALL data_output_2d( 'yz', 1 )
1343          CALL data_output_3d( 1 )
1344          DO  mid = 1, masks
1345             CALL data_output_mask( 1 )
1346          ENDDO
1347          time_do_av = MOD( time_do_av, MAX( dt_data_output_av, dt_3d ) )
1348       ENDIF
1349
1350!
1351!--    Output of particle time series
1352       IF ( particle_advection )  THEN
1353          IF ( time_dopts >= dt_dopts  .OR. &
1354               ( simulated_time >= particle_advection_start  .AND. &
1355                 first_call_lpm ) )  THEN
1356             CALL data_output_ptseries
1357             time_dopts = MOD( time_dopts, MAX( dt_dopts, dt_3d ) )
1358          ENDIF
1359       ENDIF
1360
1361!
1362!--    Output of dvrp-graphics (isosurface, particles, slicer)
1363#if defined( __dvrp_graphics )
1364       CALL DVRP_LOG_EVENT( -2, current_timestep_number-1 )
1365#endif
1366       IF ( time_dvrp >= dt_dvrp )  THEN
1367          CALL data_output_dvrp
1368          time_dvrp = MOD( time_dvrp, MAX( dt_dvrp, dt_3d ) )
1369       ENDIF
1370#if defined( __dvrp_graphics )
1371       CALL DVRP_LOG_EVENT( 2, current_timestep_number )
1372#endif
1373
1374!
1375!--    If required, set the heat flux for the next time step at a random value
1376       IF ( constant_heatflux  .AND.  random_heatflux )  THEN
1377          IF ( surf_def_h(0)%ns >= 1 )  CALL disturb_heatflux( surf_def_h(0) )
1378          IF ( surf_lsm_h%ns    >= 1 )  CALL disturb_heatflux( surf_lsm_h    )
1379          IF ( surf_usm_h%ns    >= 1 )  CALL disturb_heatflux( surf_usm_h    )
1380       ENDIF
1381
1382!
1383!--    Execute the gust module actions
1384       IF ( gust_module_enabled )  THEN
1385          CALL gust_actions( 'after_timestep' )
1386       ENDIF
1387
1388!
1389!--    Execute user-defined actions
1390       CALL user_actions( 'after_timestep' )
1391
1392!
1393!--    Determine size of next time step. Save timestep dt_3d because it is
1394!--    newly calculated in routine timestep, but required further below for
1395!--    steering the run control output interval
1396       dt_3d_old = dt_3d
1397       CALL timestep
1398
1399!
1400!--    Synchronize the timestep in case of nested run.
1401       IF ( nested_run )  THEN
1402!
1403!--       Synchronize by unifying the time step.
1404!--       Global minimum of all time-steps is used for all.
1405          CALL pmci_synchronize
1406       ENDIF
1407
1408!
1409!--    Computation and output of run control parameters.
1410!--    This is also done whenever perturbations have been imposed
1411       IF ( time_run_control >= dt_run_control  .OR.                     &
1412            timestep_scheme(1:5) /= 'runge'  .OR.  disturbance_created ) &
1413       THEN
1414          CALL run_control
1415          IF ( time_run_control >= dt_run_control )  THEN
1416             time_run_control = MOD( time_run_control, &
1417                                     MAX( dt_run_control, dt_3d_old ) )
1418          ENDIF
1419       ENDIF
1420
1421!
1422!--    Output elapsed simulated time in form of a progress bar on stdout
1423       IF ( myid == 0 )  CALL output_progress_bar
1424
1425       CALL cpu_log( log_point_s(10), 'timesteps', 'stop' )
1426
1427
1428    ENDDO   ! time loop
1429
1430!-- Vertical nesting: Deallocate variables initialized for vertical nesting   
1431    IF ( vnest_init )  CALL vnest_deallocate
1432
1433    IF ( myid == 0 )  CALL finish_progress_bar
1434
1435#if defined( __dvrp_graphics )
1436    CALL DVRP_LOG_EVENT( -2, current_timestep_number )
1437#endif
1438
1439    CALL location_message( 'finished time-stepping', .TRUE. )
1440
1441 END SUBROUTINE time_integration
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