source: palm/trunk/SOURCE/time_integration.f90 @ 2773

Last change on this file since 2773 was 2773, checked in by suehring, 6 years ago

Nesting for chemical species implemented; Bugfix passive scalar boundary condition after anterpolation; Timeseries output of surface temperature; Enable initialization of 3D topography (was commented out so far)

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