source: palm/trunk/SOURCE/time_integration.f90 @ 3004

Last change on this file since 3004 was 3004, checked in by Giersch, 3 years ago

precipitation_rate removed, further allocation checks for data output of averaged quantities implemented, double CALL of flow_statistics at the beginning of time_integration removed, further minor bugfixes, comments added

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