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source: palm/trunk/SOURCE/nesting_offl_mod.f90 @ 4834

Last change on this file since 4834 was 4834, checked in by raasch, 3 years ago
file re-formatted to follow the PALM coding standard
Property svn:keywords set to `Id`
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1	!> @file nesting_offl_mod.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 terms of the GNU General
6	! Public License as published by the Free Software Foundation, either version 3 of the License, or
7	! (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
10	! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
11	! Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with PALM. If not, see
14	! <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2021 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	!
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: nesting_offl_mod.f90 4834 2021-01-07 10:28:00Z raasch $
26	! file re-formatted to follow the PALM coding standard
27	!
28	! 4828 2021-01-05 11:21:41Z Giersch
29	! Bugfix in obtaining the correct timestamp in case of restart runs
30	!
31	! 4724 2020-10-06 17:20:39Z suehring $
32	! - Enable LOD=1 input of boundary conditions
33	! - Minor bugfix - add missing initialization of the top boundary
34	!
35	! 4582 2020-06-29 09:22:11Z suehring
36	! Remove unused variable
37	!
38	! 4581 2020-06-29 08:49:58Z suehring
39	! Omit explicit pressure forcing via geostrophic wind components in case of mesoscale nesting.
40	!
41	! 4561 2020-06-12 07:05:56Z suehring
42	! Adapt mass-flux correction also for the anelastic approximation
43	!
44	! 4561 2020-06-12 07:05:56Z suehring
45	! use statement for exchange horiz added
46	!
47	! 4360 2020-01-07 11:25:50Z suehring
48	! Bugfix, time coordinate is relative to origin_time rather than to 00:00:00 UTC.
49	!
50	! 4346 2019-12-18 11:55:56Z motisi
51	! Introduction of wall_flags_total_0, which currently sets bits based on static topography
52	! information used in wall_flags_static_0
53	!
54	! 4329 2019-12-10 15:46:36Z motisi
55	! Renamed wall_flags_0 to wall_flags_static_0
56	!
57	! 4286 2019-10-30 16:01:14Z resler
58	! Fix wrong checks of time from dynamic driver in nesting_offl_mod
59	!
60	! 4273 2019-10-24 13:40:54Z monakurppa
61	! Add a logical switch nesting_offline_chem
62	!
63	! 4270 2019-10-23 10:46:20Z monakurppa
64	! Implement offline nesting for salsa variables.
65	!
66	! 4231 2019-09-12 11:22:00Z suehring
67	! Bugfix in array deallocation
68	!
69	! 4230 2019-09-11 13:58:14Z suehring
70	! Update mean chemistry profiles. These are also used for rayleigh damping.
71	!
72	! 4227 2019-09-10 18:04:34Z gronemeier
73	! implement new palm_date_time_mod
74	!
75	! - Data input moved into nesting_offl_mod
76	! - check rephrased
77	! - time variable is now relative to time_utc_init
78	! - Define module specific data type for offline nesting in nesting_offl_mod
79	!
80	! 4182 2019-08-22 15:20:23Z scharf
81	! Corrected "Former revisions" section
82	!
83	! 4169 2019-08-19 13:54:35Z suehring
84	! Additional check added.
85	!
86	! 4168 2019-08-16 13:50:17Z suehring
87	! Replace function get_topography_top_index by topo_top_ind
88	!
89	! 4125 2019-07-29 13:31:44Z suehring
90	! In order to enable netcdf parallel access, allocate dummy arrays for the lateral boundary data on
91	! cores that actually do not belong to these boundaries.
92	!
93	! 4079 2019-07-09 18:04:41Z suehring
94	! - Set boundary condition for w at nzt+1 at the lateral boundaries, even though these won't enter
95	! the numerical solution. However, due to the mass conservation these values might some up to very
96	! large values which will occur in the run-control file
97	! - Bugfix in offline nesting of chemical species
98	! - Do not set Neumann conditions for TKE and passive scalar
99	!
100	! 4022 2019-06-12 11:52:39Z suehring
101	! Detection of boundary-layer depth in stable boundary layer on basis of boundary data improved
102	! Routine for boundary-layer depth calculation renamed and made public
103	!
104	! 3987 2019-05-22 09:52:13Z kanani
105	! Introduce alternative switch for debug output during timestepping
106	!
107	! 3964 2019-05-09 09:48:32Z suehring
108	! Ensure that veloctiy term in calculation of bulk Richardson number does not become zero
109	!
110	! 3937 2019-04-29 15:09:07Z suehring
111	! Set boundary conditon on upper-left and upper-south grid point for the u- and v-component,
112	! respectively.
113	!
114	! 3891 2019-04-12 17:52:01Z suehring
115	! Bugfix, do not overwrite lateral and top boundary data in case of restart runs.
116	!
117	! 3885 2019-04-11 11:29:34Z kanani
118	! Changes related to global restructuring of location messages and introduction of additional debug
119	! messages
120	!
121	!
122	! Do local data exchange for chemistry variables only when boundary data is coming from dynamic file
123	!
124	! 3737 2019-02-12 16:57:06Z suehring
125	! Introduce mesoscale nesting for chemical species
126	!
127	! 3705 2019-01-29 19:56:39Z suehring
128	! Formatting adjustments
129	!
130	! 3704 2019-01-29 19:51:41Z suehring
131	! Check implemented for offline nesting in child domain
132	!
133	! Initial Revision:
134	! - separate offline nesting from large_scale_nudging_mod
135	! - revise offline nesting, adjust for usage of synthetic turbulence generator
136	! - adjust Rayleigh damping depending on the time-depending atmospheric conditions
137	!
138	!
139	! Description:
140	! ------------
141	!> Offline nesting in larger-scale models. Boundary conditions for the simulation are read from
142	!> NetCDF file and are prescribed onto the respective arrays.
143	!> Further, a mass-flux correction is performed to maintain the mass balance.
144	!--------------------------------------------------------------------------------------------------!
145	MODULE nesting_offl_mod
146
147	USE arrays_3d, &
148	ONLY: diss, &
149	drho_air_zw, &
150	dzw, &
151	e, &
152	pt, &
153	pt_init, &
154	q, &
155	q_init, &
156	rdf, &
157	rdf_sc, &
158	rho_air, &
159	rho_air_zw, &
160	s, &
161	u, &
162	u_init, &
163	ug, &
164	v, &
165	v_init, &
166	vg, &
167	w, &
168	zu, &
169	zw
170
171	USE basic_constants_and_equations_mod, &
172	ONLY: g, &
173	pi
174
175	USE chem_modules, &
176	ONLY: chem_species, nesting_offline_chem
177
178	USE control_parameters, &
179	ONLY: air_chemistry, &
180	bc_dirichlet_l, &
181	bc_dirichlet_n, &
182	bc_dirichlet_r, &
183	bc_dirichlet_s, &
184	coupling_char, &
185	constant_diffusion, &
186	child_domain, &
187	debug_output_timestep, &
188	dt_3d, &
189	dz, &
190	end_time, &
191	humidity, &
192	initializing_actions, &
193	message_string, &
194	nesting_offline, &
195	neutral, &
196	passive_scalar, &
197	rans_mode, &
198	rans_tke_e, &
199	rayleigh_damping_factor, &
200	rayleigh_damping_height, &
201	salsa, &
202	spinup_time, &
203	time_since_reference_point, &
204	volume_flow
205
206	USE cpulog, &
207	ONLY: cpu_log, &
208	log_point, &
209	log_point_s
210
211	USE grid_variables
212
213	USE indices, &
214	ONLY: nbgp, nx, nxl, nxlg, nxlu, nxr, nxrg, ny, nys, nysv, nysg, nyn, nyng, nzb, nz, nzt, &
215	topo_top_ind, wall_flags_total_0
216
217	USE kinds
218
219	USE netcdf_data_input_mod, &
220	ONLY: char_fill, &
221	char_lod, &
222	check_existence, &
223	close_input_file, &
224	get_attribute, &
225	get_dimension_length, &
226	get_variable, &
227	get_variable_pr, &
228	input_pids_dynamic, &
229	inquire_num_variables, &
230	inquire_variable_names, &
231	input_file_dynamic, &
232	num_var_pids, &
233	open_read_file, &
234	pids_id
235
236	USE pegrid
237
238	USE salsa_mod, &
239	ONLY: salsa_nesting_offl_bc, &
240	salsa_nesting_offl_init, &
241	salsa_nesting_offl_input
242
243	IMPLICIT NONE
244
245	!
246	!-- Define data type for nesting in larger-scale models like COSMO.
247	!-- Data type comprises u, v, w, pt, and q at lateral and top boundaries.
248	TYPE nest_offl_type
249
250	CHARACTER(LEN=16) :: char_l = 'ls_forcing_left_' !< leading substring for variables at left boundary
251	CHARACTER(LEN=17) :: char_n = 'ls_forcing_north_' !< leading substring for variables at north boundary
252	CHARACTER(LEN=17) :: char_r = 'ls_forcing_right_' !< leading substring for variables at right boundary
253	CHARACTER(LEN=17) :: char_s = 'ls_forcing_south_' !< leading substring for variables at south boundary
254	CHARACTER(LEN=15) :: char_t = 'ls_forcing_top_' !< leading substring for variables at top boundary
255
256	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names !< list of variable in dynamic input file
257	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_l !< names of mesoscale nested chemistry variables at left
258	!< boundary
259	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_n !< names of mesoscale nested chemistry variables at north
260	!< boundary
261	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_r !< names of mesoscale nested chemistry variables at right
262	!< boundary
263	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_s !< names of mesoscale nested chemistry variables at south
264	!< boundary
265	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_t !< names of mesoscale nested chemistry variables at top
266	!< boundary
267
268	INTEGER(iwp) :: lod_east_pt = 2 !< level-of-detail of input data of potential temperature at the eastern boundary
269	INTEGER(iwp) :: lod_east_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the eastern boundary
270	INTEGER(iwp) :: lod_east_qv = 2 !< level-of-detail of input data of specific humidity at the eastern boundary
271	INTEGER(iwp) :: lod_east_u = 2 !< level-of-detail of input data of the u-component at the eastern boundary
272	INTEGER(iwp) :: lod_east_v = 2 !< level-of-detail of input data of the v-component at the eastern boundary
273	INTEGER(iwp) :: lod_east_w = 2 !< level-of-detail of input data of the w-component at the eastern boundary
274	INTEGER(iwp) :: lod_north_pt = 2 !< level-of-detail of input data of potential temperature at the northern boundary
275	INTEGER(iwp) :: lod_north_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the northern boundary
276	INTEGER(iwp) :: lod_north_qv = 2 !< level-of-detail of input data of specific humidity at the northern boundary
277	INTEGER(iwp) :: lod_north_u = 2 !< level-of-detail of input data of the u-component at the northern boundary
278	INTEGER(iwp) :: lod_north_v = 2 !< level-of-detail of input data of the v-component at the northern boundary
279	INTEGER(iwp) :: lod_north_w = 2 !< level-of-detail of input data of the w-component at the northern boundary
280	INTEGER(iwp) :: lod_south_pt = 2 !< level-of-detail of input data of potential temperature at the southern boundary
281	INTEGER(iwp) :: lod_south_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the southern boundary
282	INTEGER(iwp) :: lod_south_qv = 2 !< level-of-detail of input data of specific humidity at the southern boundary
283	INTEGER(iwp) :: lod_south_u = 2 !< level-of-detail of input data of the u-component at the southern boundary
284	INTEGER(iwp) :: lod_south_v = 2 !< level-of-detail of input data of the v-component at the southern boundary
285	INTEGER(iwp) :: lod_south_w = 2 !< level-of-detail of input data of the w-component at the southern boundary
286	INTEGER(iwp) :: lod_top_pt = 2 !< level-of-detail of input data of potential temperature at the top boundary
287	INTEGER(iwp) :: lod_top_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the top boundary
288	INTEGER(iwp) :: lod_top_qv = 2 !< level-of-detail of input data of specific humidity at the top boundary
289	INTEGER(iwp) :: lod_top_u = 2 !< level-of-detail of input data of the u-component at the top boundary
290	INTEGER(iwp) :: lod_top_v = 2 !< level-of-detail of input data of the v-component at the top boundary
291	INTEGER(iwp) :: lod_top_w = 2 !< level-of-detail of input data of the w-component at the top boundary
292	INTEGER(iwp) :: lod_west_pt = 2 !< level-of-detail of input data of potential temperature at the western boundary
293	INTEGER(iwp) :: lod_west_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the western boundary
294	INTEGER(iwp) :: lod_west_qv = 2 !< level-of-detail of input data of specific humidity at the western boundary
295	INTEGER(iwp) :: lod_west_u = 2 !< level-of-detail of input data of the u-component at the western boundary
296	INTEGER(iwp) :: lod_west_v = 2 !< level-of-detail of input data of the v-component at the western boundary
297	INTEGER(iwp) :: lod_west_w = 2 !< level-of-detail of input data of the w-component at the western boundary
298	INTEGER(iwp) :: nt !< number of time levels in dynamic input file
299	INTEGER(iwp) :: nzu !< number of vertical levels on scalar grid in dynamic input file
300	INTEGER(iwp) :: nzw !< number of vertical levels on w grid in dynamic input file
301	INTEGER(iwp) :: tind = 0 !< time index for reference time in mesoscale-offline nesting
302	INTEGER(iwp) :: tind_p = 0 !< time index for following time in mesoscale-offline nesting
303
304	LOGICAL :: init = .FALSE. !< flag indicating that offline nesting is already initialized
305
306	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_l !< flags inidicating whether left boundary data for chemistry is in
307	!< dynamic input file
308	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_n !< flags inidicating whether north boundary data for chemistry is in
309	!< dynamic input file
310	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_r !< flags inidicating whether right boundary data for chemistry is in
311	!< dynamic input file
312	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_s !< flags inidicating whether south boundary data for chemistry is in
313	!< dynamic input file
314	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_t !< flags inidicating whether top boundary data for chemistry is in
315	!< dynamic input file
316
317	REAL(wp), DIMENSION(:), ALLOCATABLE :: surface_pressure !< time dependent surface pressure
318	REAL(wp), DIMENSION(:), ALLOCATABLE :: time !< time levels in dynamic input file
319	REAL(wp), DIMENSION(:), ALLOCATABLE :: zu_atmos !< vertical levels at scalar grid in dynamic input file
320	REAL(wp), DIMENSION(:), ALLOCATABLE :: zw_atmos !< vertical levels at w grid in dynamic input file
321
322	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ug !< domain-averaged geostrophic component
323	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: vg !< domain-averaged geostrophic component
324
325	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_l !< potentital temperautre at left boundary
326	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_n !< potentital temperautre at north boundary
327	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_r !< potentital temperautre at right boundary
328	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_s !< potentital temperautre at south boundary
329	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_top !< potentital temperautre at top boundary
330	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_l !< mixing ratio at left boundary
331	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_n !< mixing ratio at north boundary
332	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_r !< mixing ratio at right boundary
333	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_s !< mixing ratio at south boundary
334	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_top !< mixing ratio at top boundary
335	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_l !< u-component at left boundary
336	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_n !< u-component at north boundary
337	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_r !< u-component at right boundary
338	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_s !< u-component at south boundary
339	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_top !< u-component at top boundary
340	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_l !< v-component at left boundary
341	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_n !< v-component at north boundary
342	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_r !< v-component at right boundary
343	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_s !< v-component at south boundary
344	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_top !< v-component at top boundary
345	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_l !< w-component at left boundary
346	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_n !< w-component at north boundary
347	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_r !< w-component at right boundary
348	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_s !< w-component at south boundary
349	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_top !< w-component at top boundary
350
351	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_l !< chemical species at left boundary
352	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_n !< chemical species at north boundary
353	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_r !< chemical species at right boundary
354	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_s !< chemical species at south boundary
355	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_top !< chemical species at left boundary
356
357	END TYPE nest_offl_type
358
359	INTEGER(iwp) :: i_bound !< boundary grid point in x-direction for scalars, v, and w
360	INTEGER(iwp) :: i_bound_u !< boundary grid point in x-direction for u
361	INTEGER(iwp) :: i_end !< end index for array allocation along x-direction at norther/southern boundary
362	INTEGER(iwp) :: i_start !< start index for array allocation along x-direction at norther/southern boundary (scalars, v, w)
363	INTEGER(iwp) :: i_start_u !< start index for array allocation along x-direction at norther/southern boundary (u)
364	INTEGER(iwp) :: j_bound !< boundary grid point in y-direction for scalars, u, and w
365	INTEGER(iwp) :: j_bound_v !< boundary grid point in y-direction for v
366	INTEGER(iwp) :: j_end !< end index for array allocation along y-direction at eastern/western boundary
367	INTEGER(iwp) :: j_start !< start index for array allocation along y-direction at eastern/western boundary (scalars, u, w)
368	INTEGER(iwp) :: j_start_v !< start index for array allocation along y-direction at eastern/western boundary (v)
369	INTEGER(iwp) :: lod !< level-of-detail of lateral input data
370
371	REAL(wp) :: fac_dt !< interpolation factor
372	REAL(wp) :: zi_ribulk = 0.0_wp !< boundary-layer depth according to bulk Richardson criterion, i.e. the height where Ri_bulk
373	!< exceeds the critical bulk Richardson number of 0.2
374
375	TYPE(nest_offl_type) :: nest_offl !< data structure for data input at lateral and top boundaries (provided by Inifor)
376
377	SAVE
378	PRIVATE
379	!
380	!-- Public subroutines
381	PUBLIC nesting_offl_bc, &
382	nesting_offl_calc_zi, &
383	nesting_offl_check_parameters, &
384	nesting_offl_geostrophic_wind, &
385	nesting_offl_header, &
386	nesting_offl_init, &
387	nesting_offl_input, &
388	nesting_offl_interpolation_factor, &
389	nesting_offl_mass_conservation, &
390	nesting_offl_parin
391	!
392	!-- Public variables
393	PUBLIC zi_ribulk
394
395	INTERFACE nesting_offl_bc
396	MODULE PROCEDURE nesting_offl_bc
397	END INTERFACE nesting_offl_bc
398
399	INTERFACE nesting_offl_calc_zi
400	MODULE PROCEDURE nesting_offl_calc_zi
401	END INTERFACE nesting_offl_calc_zi
402
403	INTERFACE nesting_offl_check_parameters
404	MODULE PROCEDURE nesting_offl_check_parameters
405	END INTERFACE nesting_offl_check_parameters
406
407	INTERFACE nesting_offl_geostrophic_wind
408	MODULE PROCEDURE nesting_offl_geostrophic_wind
409	END INTERFACE nesting_offl_geostrophic_wind
410
411	INTERFACE nesting_offl_header
412	MODULE PROCEDURE nesting_offl_header
413	END INTERFACE nesting_offl_header
414
415	INTERFACE nesting_offl_init
416	MODULE PROCEDURE nesting_offl_init
417	END INTERFACE nesting_offl_init
418
419	INTERFACE nesting_offl_input
420	MODULE PROCEDURE nesting_offl_input
421	END INTERFACE nesting_offl_input
422
423	INTERFACE nesting_offl_interpolation_factor
424	MODULE PROCEDURE nesting_offl_interpolation_factor
425	END INTERFACE nesting_offl_interpolation_factor
426
427	INTERFACE nesting_offl_mass_conservation
428	MODULE PROCEDURE nesting_offl_mass_conservation
429	END INTERFACE nesting_offl_mass_conservation
430
431	INTERFACE nesting_offl_parin
432	MODULE PROCEDURE nesting_offl_parin
433	END INTERFACE nesting_offl_parin
434
435	CONTAINS
436
437	!--------------------------------------------------------------------------------------------------!
438	! Description:
439	! ------------
440	!> Reads data at lateral and top boundaries derived from larger-scale model.
441	!--------------------------------------------------------------------------------------------------!
442	SUBROUTINE nesting_offl_input
443
444	INTEGER(iwp) :: n !< running index for chemistry variables
445
446	!
447	!-- Initialize INIFOR forcing in first call.
448	IF ( .NOT. nest_offl%init ) THEN
449	#if defined ( __netcdf )
450	!
451	!-- Open file in read-only mode
452	CALL open_read_file( TRIM( input_file_dynamic ) // TRIM( coupling_char ), pids_id )
453	!
454	!-- At first, inquire all variable names.
455	CALL inquire_num_variables( pids_id, num_var_pids )
456	!
457	!-- Allocate memory to store variable names.
458	ALLOCATE( nest_offl%var_names(1:num_var_pids) )
459	CALL inquire_variable_names( pids_id, nest_offl%var_names )
460	!
461	!-- Read time dimension, allocate memory and finally read time array
462	CALL get_dimension_length( pids_id, nest_offl%nt, 'time' )
463
464	IF ( check_existence( nest_offl%var_names, 'time' ) ) THEN
465	ALLOCATE( nest_offl%time(0:nest_offl%nt-1) )
466	CALL get_variable( pids_id, 'time', nest_offl%time )
467	ENDIF
468	!
469	!-- Read vertical dimension of scalar und w grid
470	CALL get_dimension_length( pids_id, nest_offl%nzu, 'z' )
471	CALL get_dimension_length( pids_id, nest_offl%nzw, 'zw' )
472
473	IF ( check_existence( nest_offl%var_names, 'z' ) ) THEN
474	ALLOCATE( nest_offl%zu_atmos(1:nest_offl%nzu) )
475	CALL get_variable( pids_id, 'z', nest_offl%zu_atmos )
476	ENDIF
477	IF ( check_existence( nest_offl%var_names, 'zw' ) ) THEN
478	ALLOCATE( nest_offl%zw_atmos(1:nest_offl%nzw) )
479	CALL get_variable( pids_id, 'zw', nest_offl%zw_atmos )
480	ENDIF
481	!
482	!-- Read surface pressure
483	IF ( check_existence( nest_offl%var_names, 'surface_forcing_surface_pressure' ) ) THEN
484	ALLOCATE( nest_offl%surface_pressure(0:nest_offl%nt-1) )
485	CALL get_variable( pids_id, 'surface_forcing_surface_pressure', &
486	nest_offl%surface_pressure )
487	ENDIF
488	!
489	!-- Close input file
490	CALL close_input_file( pids_id )
491	#endif
492	ENDIF
493	!
494	!-- Check if dynamic driver data input is required.
495	IF ( nest_offl%time(nest_offl%tind_p) <= MAX( time_since_reference_point, 0.0_wp) .OR. &
496	.NOT. nest_offl%init ) THEN
497	CONTINUE
498	!
499	!-- Return otherwise
500	ELSE
501	RETURN
502	ENDIF
503	!
504	!-- Start of CPU measurement
505	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'start' )
506
507	!
508	!-- Obtain time index for current point in time. Note, the time coordinate in the input file is
509	!-- always relative to the initial time in UTC, i.e. the time coordinate always starts at 0.0 even
510	!-- if the initial UTC is e.g. 7200.0. Further, since time_since_reference_point is negativ here
511	!-- when spinup is applied, use MAX function to obtain correct time index.
512	nest_offl%tind = MINLOC( ABS( nest_offl%time - MAX( time_since_reference_point, 0.0_wp ) ), &
513	DIM = 1 ) - 1
514	!
515	!-- Note, in case of restart runs, the time index for the boundary data may indicate a time in
516	!-- the future. This needs to be checked and corrected.
517	IF ( TRIM( initializing_actions ) == 'read_restart_data' .AND. &
518	nest_offl%time(nest_offl%tind) > time_since_reference_point ) THEN
519	nest_offl%tind = nest_offl%tind - 1
520	ENDIF
521	nest_offl%tind_p = nest_offl%tind + 1
522	!
523	!-- Open file in read-only mode
524	#if defined ( __netcdf )
525	CALL open_read_file( TRIM( input_file_dynamic ) // TRIM( coupling_char ), pids_id )
526	!
527	!-- Read geostrophic wind components
528	! DO t = nest_offl%tind, nest_offl%tind_p
529	! CALL get_variable_pr( pids_id, 'ls_forcing_ug', t+1, &
530	! nest_offl%ug(t-nest_offl%tind,nzb+1:nzt) )
531	! CALL get_variable_pr( pids_id, 'ls_forcing_vg', t+1, &
532	! nest_offl%vg(t-nest_offl%tind,nzb+1:nzt) )
533	! ENDDO
534	!
535	!-- Read data at lateral and top boundaries. Please note, at left and right domain boundary,
536	!-- yz-layers are read for u, v, w, pt and q.
537	!-- For the v-component, the data starts at nysv, while for the other quantities the data starts at
538	!-- nys. This is equivalent at the north and south domain boundary for the u-component (nxlu).
539	!-- Note, lateral data is also accessed by parallel IO, which is the reason why different arguments
540	!-- are passed depending on the boundary control flags. Cores that do not belong to the respective
541	!-- boundary only do a dummy read with count = 0, just in order to participate the collective
542	!-- operation. This is because collective parallel access shows better performance than just a
543	!-- conditional access.
544	!-- Read data for LOD 2, i.e. time-dependent xz-, yz-, and xy-slices.
545	IF ( lod == 2 ) THEN
546	CALL get_variable( pids_id, 'ls_forcing_left_u', &
547	nest_offl%u_l, & ! array to be read
548	MERGE( nys+1, 1, bc_dirichlet_l), & ! start index y direction
549	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
550	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
551	MERGE( nyn-nys+1, 0, bc_dirichlet_l), & ! number of elements along y
552	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements alogn z
553	MERGE( 2, 0, bc_dirichlet_l), & ! number of time steps (2 or 0)
554	.TRUE. ) ! parallel IO when compiled accordingly
555
556	CALL get_variable( pids_id, 'ls_forcing_left_v', &
557	nest_offl%v_l, &
558	MERGE( nysv, 1, bc_dirichlet_l), &
559	MERGE( nzb+1, 1, bc_dirichlet_l), &
560	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
561	MERGE( nyn-nysv+1, 0, bc_dirichlet_l), &
562	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
563	MERGE( 2, 0, bc_dirichlet_l), &
564	.TRUE. )
565
566	CALL get_variable( pids_id, 'ls_forcing_left_w', &
567	nest_offl%w_l, &
568	MERGE( nys+1, 1, bc_dirichlet_l), &
569	MERGE( nzb+1, 1, bc_dirichlet_l), &
570	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
571	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
572	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
573	MERGE( 2, 0, bc_dirichlet_l), &
574	.TRUE. )
575
576	IF ( .NOT. neutral ) THEN
577	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
578	nest_offl%pt_l, &
579	MERGE( nys+1, 1, bc_dirichlet_l), &
580	MERGE( nzb+1, 1, bc_dirichlet_l), &
581	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
582	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
583	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
584	MERGE( 2, 0, bc_dirichlet_l), &
585	.TRUE. )
586	ENDIF
587
588	IF ( humidity ) THEN
589	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
590	nest_offl%q_l, &
591	MERGE( nys+1, 1, bc_dirichlet_l), &
592	MERGE( nzb+1, 1, bc_dirichlet_l), &
593	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
594	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
595	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
596	MERGE( 2, 0, bc_dirichlet_l), &
597	.TRUE. )
598	ENDIF
599
600	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
601	DO n = 1, UBOUND( nest_offl%var_names_chem_l, 1 )
602	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_l(n) ) ) THEN
603	CALL get_variable( pids_id, &
604	TRIM( nest_offl%var_names_chem_l(n) ), &
605	nest_offl%chem_l(:,:,:,n), &
606	MERGE( nys+1, 1, bc_dirichlet_l), &
607	MERGE( nzb+1, 1, bc_dirichlet_l), &
608	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
609	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
610	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
611	MERGE( 2, 0, bc_dirichlet_l), &
612	.TRUE. )
613	nest_offl%chem_from_file_l(n) = .TRUE.
614	ENDIF
615	ENDDO
616	ENDIF
617	!
618	!-- Read data for eastern boundary
619	CALL get_variable( pids_id, 'ls_forcing_right_u', &
620	nest_offl%u_r, &
621	MERGE( nys+1, 1, bc_dirichlet_r), &
622	MERGE( nzb+1, 1, bc_dirichlet_r), &
623	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
624	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
625	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
626	MERGE( 2, 0, bc_dirichlet_r), &
627	.TRUE. )
628
629	CALL get_variable( pids_id, 'ls_forcing_right_v', &
630	nest_offl%v_r, &
631	MERGE( nysv, 1, bc_dirichlet_r), &
632	MERGE( nzb+1, 1, bc_dirichlet_r), &
633	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
634	MERGE( nyn-nysv+1, 0, bc_dirichlet_r), &
635	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
636	MERGE( 2, 0, bc_dirichlet_r), &
637	.TRUE. )
638
639	CALL get_variable( pids_id, 'ls_forcing_right_w', &
640	nest_offl%w_r, &
641	MERGE( nys+1, 1, bc_dirichlet_r), &
642	MERGE( nzb+1, 1, bc_dirichlet_r), &
643	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
644	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
645	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
646	MERGE( 2, 0, bc_dirichlet_r), &
647	.TRUE. )
648
649	IF ( .NOT. neutral ) THEN
650	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
651	nest_offl%pt_r, &
652	MERGE( nys+1, 1, bc_dirichlet_r), &
653	MERGE( nzb+1, 1, bc_dirichlet_r), &
654	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
655	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
656	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
657	MERGE( 2, 0, bc_dirichlet_r), &
658	.TRUE. )
659	ENDIF
660
661	IF ( humidity ) THEN
662	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
663	nest_offl%q_r, &
664	MERGE( nys+1, 1, bc_dirichlet_r), &
665	MERGE( nzb+1, 1, bc_dirichlet_r), &
666	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
667	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
668	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
669	MERGE( 2, 0, bc_dirichlet_r), &
670	.TRUE. )
671	ENDIF
672
673	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
674	DO n = 1, UBOUND( nest_offl%var_names_chem_r, 1 )
675	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_r(n) ) ) THEN
676	CALL get_variable( pids_id, &
677	TRIM( nest_offl%var_names_chem_r(n) ), &
678	nest_offl%chem_r(:,:,:,n), &
679	MERGE( nys+1, 1, bc_dirichlet_r), &
680	MERGE( nzb+1, 1, bc_dirichlet_r), &
681	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
682	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
683	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
684	MERGE( 2, 0, bc_dirichlet_r), &
685	.TRUE. )
686	nest_offl%chem_from_file_r(n) = .TRUE.
687	ENDIF
688	ENDDO
689	ENDIF
690	!
691	!-- Read data for northern boundary
692	CALL get_variable( pids_id, 'ls_forcing_north_u', &
693	nest_offl%u_n, &
694	MERGE( nxlu, 1, bc_dirichlet_n ), &
695	MERGE( nzb+1, 1, bc_dirichlet_n ), &
696	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
697	MERGE( nxr-nxlu+1, 0, bc_dirichlet_n ), &
698	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
699	MERGE( 2, 0, bc_dirichlet_n ), &
700	.TRUE. )
701
702	CALL get_variable( pids_id, 'ls_forcing_north_v', &
703	nest_offl%v_n, &
704	MERGE( nxl+1, 1, bc_dirichlet_n ), &
705	MERGE( nzb+1, 1, bc_dirichlet_n ), &
706	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
707	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
708	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
709	MERGE( 2, 0, bc_dirichlet_n ), &
710	.TRUE. )
711
712	CALL get_variable( pids_id, 'ls_forcing_north_w', &
713	nest_offl%w_n, &
714	MERGE( nxl+1, 1, bc_dirichlet_n ), &
715	MERGE( nzb+1, 1, bc_dirichlet_n ), &
716	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
717	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
718	MERGE( nest_offl%nzw, 0, bc_dirichlet_n ), &
719	MERGE( 2, 0, bc_dirichlet_n ), &
720	.TRUE. )
721
722	IF ( .NOT. neutral ) THEN
723	CALL get_variable( pids_id, 'ls_forcing_north_pt', &
724	nest_offl%pt_n, &
725	MERGE( nxl+1, 1, bc_dirichlet_n ), &
726	MERGE( nzb+1, 1, bc_dirichlet_n ), &
727	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
728	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
729	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
730	MERGE( 2, 0, bc_dirichlet_n ), &
731	.TRUE. )
732	ENDIF
733	IF ( humidity ) THEN
734	CALL get_variable( pids_id, 'ls_forcing_north_qv', &
735	nest_offl%q_n, &
736	MERGE( nxl+1, 1, bc_dirichlet_n ), &
737	MERGE( nzb+1, 1, bc_dirichlet_n ), &
738	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
739	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
740	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
741	MERGE( 2, 0, bc_dirichlet_n ), &
742	.TRUE. )
743	ENDIF
744
745	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
746	DO n = 1, UBOUND( nest_offl%var_names_chem_n, 1 )
747	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_n(n) ) ) THEN
748	CALL get_variable( pids_id, &
749	TRIM( nest_offl%var_names_chem_n(n) ), &
750	nest_offl%chem_n(:,:,:,n), &
751	MERGE( nxl+1, 1, bc_dirichlet_n ), &
752	MERGE( nzb+1, 1, bc_dirichlet_n ), &
753	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
754	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
755	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
756	MERGE( 2, 0, bc_dirichlet_n ), &
757	.TRUE. )
758	nest_offl%chem_from_file_n(n) = .TRUE.
759	ENDIF
760	ENDDO
761	ENDIF
762	!
763	!-- Read data for southern boundary
764	CALL get_variable( pids_id, 'ls_forcing_south_u', &
765	nest_offl%u_s, &
766	MERGE( nxlu, 1, bc_dirichlet_s ), &
767	MERGE( nzb+1, 1, bc_dirichlet_s ), &
768	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
769	MERGE( nxr-nxlu+1, 0, bc_dirichlet_s ), &
770	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
771	MERGE( 2, 0, bc_dirichlet_s ), &
772	.TRUE. )
773
774	CALL get_variable( pids_id, 'ls_forcing_south_v', &
775	nest_offl%v_s, &
776	MERGE( nxl+1, 1, bc_dirichlet_s ), &
777	MERGE( nzb+1, 1, bc_dirichlet_s ), &
778	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
779	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
780	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
781	MERGE( 2, 0, bc_dirichlet_s ), &
782	.TRUE. )
783
784	CALL get_variable( pids_id, 'ls_forcing_south_w', &
785	nest_offl%w_s, &
786	MERGE( nxl+1, 1, bc_dirichlet_s ), &
787	MERGE( nzb+1, 1, bc_dirichlet_s ), &
788	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
789	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
790	MERGE( nest_offl%nzw, 0, bc_dirichlet_s ), &
791	MERGE( 2, 0, bc_dirichlet_s ), &
792	.TRUE. )
793
794	IF ( .NOT. neutral ) THEN
795	CALL get_variable( pids_id, 'ls_forcing_south_pt', &
796	nest_offl%pt_s, &
797	MERGE( nxl+1, 1, bc_dirichlet_s ), &
798	MERGE( nzb+1, 1, bc_dirichlet_s ), &
799	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
800	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
801	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
802	MERGE( 2, 0, bc_dirichlet_s ), &
803	.TRUE. )
804	ENDIF
805	IF ( humidity ) THEN
806	CALL get_variable( pids_id, 'ls_forcing_south_qv', &
807	nest_offl%q_s, &
808	MERGE( nxl+1, 1, bc_dirichlet_s ), &
809	MERGE( nzb+1, 1, bc_dirichlet_s ), &
810	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
811	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
812	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
813	MERGE( 2, 0, bc_dirichlet_s ), &
814	.TRUE. )
815	ENDIF
816
817	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
818	DO n = 1, UBOUND( nest_offl%var_names_chem_s, 1 )
819	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_s(n) ) ) THEN
820	CALL get_variable( pids_id, &
821	TRIM( nest_offl%var_names_chem_s(n) ), &
822	nest_offl%chem_s(:,:,:,n), &
823	MERGE( nxl+1, 1, bc_dirichlet_s ), &
824	MERGE( nzb+1, 1, bc_dirichlet_s ), &
825	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
826	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
827	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
828	MERGE( 2, 0, bc_dirichlet_s ), &
829	.TRUE. )
830	nest_offl%chem_from_file_s(n) = .TRUE.
831	ENDIF
832	ENDDO
833	ENDIF
834	!
835	!-- Top boundary
836	CALL get_variable( pids_id, 'ls_forcing_top_u', &
837	nest_offl%u_top(0:1,nys:nyn,nxlu:nxr), &
838	nxlu, nys+1, nest_offl%tind+1, &
839	nxr-nxlu+1, nyn-nys+1, 2, .TRUE. )
840
841	CALL get_variable( pids_id, 'ls_forcing_top_v', &
842	nest_offl%v_top(0:1,nysv:nyn,nxl:nxr), &
843	nxl+1, nysv, nest_offl%tind+1, &
844	nxr-nxl+1, nyn-nysv+1, 2, .TRUE. )
845
846	CALL get_variable( pids_id, 'ls_forcing_top_w', &
847	nest_offl%w_top(0:1,nys:nyn,nxl:nxr), &
848	nxl+1, nys+1, nest_offl%tind+1, &
849	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
850
851	IF ( .NOT. neutral ) THEN
852	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
853	nest_offl%pt_top(0:1,nys:nyn,nxl:nxr), &
854	nxl+1, nys+1, nest_offl%tind+1, &
855	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
856	ENDIF
857	IF ( humidity ) THEN
858	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
859	nest_offl%q_top(0:1,nys:nyn,nxl:nxr), &
860	nxl+1, nys+1, nest_offl%tind+1, &
861	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
862	ENDIF
863
864	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
865	DO n = 1, UBOUND( nest_offl%var_names_chem_t, 1 )
866	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_t(n) ) ) THEN
867	CALL get_variable( pids_id, &
868	TRIM( nest_offl%var_names_chem_t(n) ), &
869	nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,n), &
870	nxl+1, nys+1, nest_offl%tind+1, &
871	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
872	nest_offl%chem_from_file_t(n) = .TRUE.
873	ENDIF
874	ENDDO
875	ENDIF
876	!
877	!-- Read data for LOD 1, i.e. time-dependent profiles. In constrast to LOD 2 where the amount of IO
878	!-- is larger, only the respective boundary processes read the data.
879	ELSE
880	IF ( bc_dirichlet_l ) THEN
881	CALL get_variable( pids_id, 'ls_forcing_left_u', &
882	nest_offl%u_l(0:1,:,1:1), & ! array to be read
883	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
884	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
885	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements along z
886	MERGE( 2, 0, bc_dirichlet_l) ) ! number of time steps (2 or 0)
887	CALL get_variable( pids_id, 'ls_forcing_left_v', &
888	nest_offl%v_l(0:1,:,1:1), &
889	MERGE( nzb+1, 1, bc_dirichlet_l), &
890	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
891	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
892	MERGE( 2, 0, bc_dirichlet_l) )
893	CALL get_variable( pids_id, 'ls_forcing_left_w', &
894	nest_offl%w_l(0:1,:,1:1), &
895	MERGE( nzb+1, 1, bc_dirichlet_l), &
896	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
897	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
898	MERGE( 2, 0, bc_dirichlet_l) )
899	IF ( .NOT. neutral ) THEN
900	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
901	nest_offl%pt_l(0:1,:,1:1), &
902	MERGE( nzb+1, 1, bc_dirichlet_l), &
903	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
904	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
905	MERGE( 2, 0, bc_dirichlet_l) )
906	ENDIF
907	IF ( humidity ) THEN
908	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
909	nest_offl%q_l(0:1,:,1:1), &
910	MERGE( nzb+1, 1, bc_dirichlet_l), &
911	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
912	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
913	MERGE( 2, 0, bc_dirichlet_l) )
914	ENDIF
915	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
916	DO n = 1, UBOUND( nest_offl%var_names_chem_t, 1 )
917	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_t(n) ) ) THEN
918	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
919	nest_offl%chem_l(0:1,:,1:1,n), &
920	MERGE( nzb+1, 1, bc_dirichlet_l), &
921	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
922	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
923	MERGE( 2, 0, bc_dirichlet_l) )
924	nest_offl%chem_from_file_l(n) = .TRUE.
925	ENDIF
926	ENDDO
927	ENDIF
928	ENDIF
929	IF ( bc_dirichlet_r ) THEN
930	CALL get_variable( pids_id, 'ls_forcing_right_u', &
931	nest_offl%u_r(0:1,:,1:1), &
932	MERGE( nzb+1, 1, bc_dirichlet_r), &
933	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
934	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
935	MERGE( 2, 0, bc_dirichlet_r) )
936	CALL get_variable( pids_id, 'ls_forcing_right_v', &
937	nest_offl%v_r(0:1,:,1:1), &
938	MERGE( nzb+1, 1, bc_dirichlet_r), &
939	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
940	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
941	MERGE( 2, 0, bc_dirichlet_r) )
942	CALL get_variable( pids_id, 'ls_forcing_right_w', &
943	nest_offl%w_r(0:1,:,1:1), &
944	MERGE( nzb+1, 1, bc_dirichlet_r), &
945	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
946	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
947	MERGE( 2, 0, bc_dirichlet_r) )
948	IF ( .NOT. neutral ) THEN
949	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
950	nest_offl%pt_r(0:1,:,1:1), &
951	MERGE( nzb+1, 1, bc_dirichlet_r), &
952	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
953	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
954	MERGE( 2, 0, bc_dirichlet_r) )
955	ENDIF
956	IF ( humidity ) THEN
957	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
958	nest_offl%q_r(0:1,:,1:1), &
959	MERGE( nzb+1, 1, bc_dirichlet_r), &
960	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
961	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
962	MERGE( 2, 0, bc_dirichlet_r) )
963	ENDIF
964	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
965	DO n = 1, UBOUND( nest_offl%var_names_chem_t, 1 )
966	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_t(n) ) ) THEN
967	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
968	nest_offl%chem_r(0:1,:,1:1,n), &
969	MERGE( nzb+1, 1, bc_dirichlet_r), &
970	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
971	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
972	MERGE( 2, 0, bc_dirichlet_r) )
973	nest_offl%chem_from_file_r(n) = .TRUE.
974	ENDIF
975	ENDDO
976	ENDIF
977	ENDIF
978	IF ( bc_dirichlet_n ) THEN
979	CALL get_variable( pids_id, 'ls_forcing_north_u', &
980	nest_offl%u_n(0:1,:,1:1), &
981	MERGE( nzb+1, 1, bc_dirichlet_n), &
982	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
983	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
984	MERGE( 2, 0, bc_dirichlet_n) )
985	CALL get_variable( pids_id, 'ls_forcing_north_v', &
986	nest_offl%v_n(0:1,:,1:1), &
987	MERGE( nzb+1, 1, bc_dirichlet_n), &
988	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
989	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
990	MERGE( 2, 0, bc_dirichlet_n) )
991	CALL get_variable( pids_id, 'ls_forcing_north_w', &
992	nest_offl%w_n(0:1,:,1:1), &
993	MERGE( nzb+1, 1, bc_dirichlet_n), &
994	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
995	MERGE( nest_offl%nzw, 0, bc_dirichlet_n), &
996	MERGE( 2, 0, bc_dirichlet_n) )
997	IF ( .NOT. neutral ) THEN
998	CALL get_variable( pids_id, 'ls_forcing_north_pt', &
999	nest_offl%pt_n(0:1,:,1:1), &
1000	MERGE( nzb+1, 1, bc_dirichlet_n), &
1001	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1002	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1003	MERGE( 2, 0, bc_dirichlet_n) )
1004	ENDIF
1005	IF ( humidity ) THEN
1006	CALL get_variable( pids_id, 'ls_forcing_north_qv', &
1007	nest_offl%q_n(0:1,:,1:1), &
1008	MERGE( nzb+1, 1, bc_dirichlet_n), &
1009	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1010	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1011	MERGE( 2, 0, bc_dirichlet_n) )
1012	ENDIF
1013	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1014	DO n = 1, UBOUND( nest_offl%var_names_chem_t, 1 )
1015	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_t(n) ) ) THEN
1016	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1017	nest_offl%chem_n(0:1,:,1:1,n), &
1018	MERGE( nzb+1, 1, bc_dirichlet_n), &
1019	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1020	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1021	MERGE( 2, 0, bc_dirichlet_n) )
1022	nest_offl%chem_from_file_n(n) = .TRUE.
1023	ENDIF
1024	ENDDO
1025	ENDIF
1026	ENDIF
1027	IF ( bc_dirichlet_s ) THEN
1028	CALL get_variable( pids_id, 'ls_forcing_south_u', &
1029	nest_offl%u_s(0:1,:,1:1), &
1030	MERGE( nzb+1, 1, bc_dirichlet_s), &
1031	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1032	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1033	MERGE( 2, 0, bc_dirichlet_s) )
1034	CALL get_variable( pids_id, 'ls_forcing_south_v', &
1035	nest_offl%v_s(0:1,:,1:1), &
1036	MERGE( nzb+1, 1, bc_dirichlet_s), &
1037	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1038	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1039	MERGE( 2, 0, bc_dirichlet_s) )
1040	CALL get_variable( pids_id, 'ls_forcing_south_w', &
1041	nest_offl%w_s(0:1,:,1:1), &
1042	MERGE( nzb+1, 1, bc_dirichlet_s), &
1043	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1044	MERGE( nest_offl%nzw, 0, bc_dirichlet_s), &
1045	MERGE( 2, 0, bc_dirichlet_s) )
1046	IF ( .NOT. neutral ) THEN
1047	CALL get_variable( pids_id, 'ls_forcing_south_pt', &
1048	nest_offl%pt_s(0:1,:,1:1), &
1049	MERGE( nzb+1, 1, bc_dirichlet_s), &
1050	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1051	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1052	MERGE( 2, 0, bc_dirichlet_s) )
1053	ENDIF
1054	IF ( humidity ) THEN
1055	CALL get_variable( pids_id, 'ls_forcing_south_qv', &
1056	nest_offl%q_s(0:1,:,1:1), &
1057	MERGE( nzb+1, 1, bc_dirichlet_s), &
1058	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1059	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1060	MERGE( 2, 0, bc_dirichlet_s) )
1061	ENDIF
1062	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1063	DO n = 1, UBOUND( nest_offl%var_names_chem_t, 1 )
1064	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_t(n) ) ) THEN
1065	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1066	nest_offl%chem_s(0:1,:,1:1,n), &
1067	MERGE( nzb+1, 1, bc_dirichlet_s), &
1068	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1069	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1070	MERGE( 2, 0, bc_dirichlet_s) )
1071	nest_offl%chem_from_file_s(n) = .TRUE.
1072	ENDIF
1073	ENDDO
1074	ENDIF
1075	ENDIF
1076	!
1077	!-- Read top boundary data, which is actually only a scalar value in the LOD 1 case.
1078	CALL get_variable( pids_id, 'ls_forcing_top_u', &
1079	nest_offl%u_top(0:1,1,1), & ! array to be read
1080	nest_offl%tind+1, & ! start index in time
1081	2 ) ! number of elements to be read
1082	CALL get_variable( pids_id, 'ls_forcing_top_v', &
1083	nest_offl%v_top(0:1,1,1), &
1084	nest_offl%tind+1, &
1085	2 )
1086	CALL get_variable( pids_id, 'ls_forcing_top_w', &
1087	nest_offl%w_top(0:1,1,1), &
1088	nest_offl%tind+1, &
1089	2 )
1090	IF ( .NOT. neutral ) THEN
1091	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
1092	nest_offl%pt_top(0:1,1,1), &
1093	nest_offl%tind+1, &
1094	2 )
1095	ENDIF
1096	IF ( humidity ) THEN
1097	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
1098	nest_offl%q_top(0:1,1,1), &
1099	nest_offl%tind+1, &
1100	2 )
1101	ENDIF
1102	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1103	DO n = 1, UBOUND( nest_offl%var_names_chem_t, 1 )
1104	IF ( check_existence( nest_offl%var_names, nest_offl%var_names_chem_t(n) ) ) THEN
1105	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1106	nest_offl%chem_top(0:1,1,1,n), &
1107	nest_offl%tind+1, &
1108	2 )
1109	nest_offl%chem_from_file_t(n) = .TRUE.
1110	ENDIF
1111	ENDDO
1112	ENDIF
1113	ENDIF
1114
1115
1116	!
1117	!-- Close input file
1118	CALL close_input_file( pids_id )
1119	#endif
1120	!
1121	!-- Set control flag to indicate that boundary data has been initially input.
1122	nest_offl%init = .TRUE.
1123	!
1124	!-- Call offline nesting for salsa
1125	IF ( salsa ) CALL salsa_nesting_offl_input
1126	!
1127	!-- End of CPU measurement
1128	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'stop' )
1129
1130	END SUBROUTINE nesting_offl_input
1131
1132
1133	!--------------------------------------------------------------------------------------------------!
1134	! Description:
1135	! ------------
1136	!> In this subroutine a constant mass within the model domain is guaranteed.
1137	!> Larger-scale models may be based on a compressible equation system, which is not consistent with
1138	!> PALMs incompressible equation system. In order to avoid a decrease or increase of mass during the
1139	!> simulation, non-divergent flow through the lateral and top boundaries is compensated by the
1140	!> vertical wind component at the top boundary.
1141	!--------------------------------------------------------------------------------------------------!
1142	SUBROUTINE nesting_offl_mass_conservation
1143
1144	INTEGER(iwp) :: i !< grid index in x-direction
1145	INTEGER(iwp) :: j !< grid index in y-direction
1146	INTEGER(iwp) :: k !< grid index in z-direction
1147
1148	REAL(wp) :: d_area_t !< inverse of the total area of the horizontal model domain
1149	REAL(wp) :: w_correct !< vertical velocity increment required to compensate non-divergent flow through the boundaries
1150
1151	REAL(wp), DIMENSION(1:3) :: volume_flow_l !< local volume flow
1152
1153
1154	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'start' )
1155
1156	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
1157
1158	volume_flow = 0.0_wp
1159	volume_flow_l = 0.0_wp
1160
1161	d_area_t = 1.0_wp / ( ( nx + 1 ) * dx * ( ny + 1 ) * dy )
1162
1163	IF ( bc_dirichlet_l ) THEN
1164	i = nxl
1165	DO j = nys, nyn
1166	DO k = nzb+1, nzt
1167	volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) * dy * rho_air(k) &
1168	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 1 ) )
1169	ENDDO
1170	ENDDO
1171	ENDIF
1172	IF ( bc_dirichlet_r ) THEN
1173	i = nxr+1
1174	DO j = nys, nyn
1175	DO k = nzb+1, nzt
1176	volume_flow_l(1) = volume_flow_l(1) - u(k,j,i) * dzw(k) * dy * rho_air(k) &
1177	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 1 ) )
1178	ENDDO
1179	ENDDO
1180	ENDIF
1181	IF ( bc_dirichlet_s ) THEN
1182	j = nys
1183	DO i = nxl, nxr
1184	DO k = nzb+1, nzt
1185	volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) * dx * rho_air(k) &
1186	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 2 ) )
1187	ENDDO
1188	ENDDO
1189	ENDIF
1190	IF ( bc_dirichlet_n ) THEN
1191	j = nyn+1
1192	DO i = nxl, nxr
1193	DO k = nzb+1, nzt
1194	volume_flow_l(2) = volume_flow_l(2) - v(k,j,i) * dzw(k) * dx * rho_air(k) &
1195	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 2 ) )
1196	ENDDO
1197	ENDDO
1198	ENDIF
1199	!
1200	!-- Top boundary
1201	k = nzt
1202	DO i = nxl, nxr
1203	DO j = nys, nyn
1204	volume_flow_l(3) = volume_flow_l(3) - rho_air_zw(k) * w(k,j,i) * dx * dy
1205	ENDDO
1206	ENDDO
1207
1208	#if defined( __parallel )
1209	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1210	CALL MPI_ALLREDUCE( volume_flow_l, volume_flow, 3, MPI_REAL, MPI_SUM, comm2d, ierr )
1211	#else
1212	volume_flow = volume_flow_l
1213	#endif
1214
1215	w_correct = SUM( volume_flow ) * d_area_t * drho_air_zw(nzt)
1216
1217	DO i = nxl, nxr
1218	DO j = nys, nyn
1219	DO k = nzt, nzt + 1
1220	w(k,j,i) = w(k,j,i) + w_correct &
1221	* MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 3 ) )
1222	ENDDO
1223	ENDDO
1224	ENDDO
1225
1226	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
1227
1228	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'end' )
1229
1230	END SUBROUTINE nesting_offl_mass_conservation
1231
1232
1233	!--------------------------------------------------------------------------------------------------!
1234	! Description:
1235	! ------------
1236	!> Set the lateral and top boundary conditions in case the PALM domain is nested offline in a
1237	!> mesoscale model. Further, average boundary data and determine mean profiles, further used for
1238	!> correct damping in the sponge layer.
1239	!--------------------------------------------------------------------------------------------------!
1240	SUBROUTINE nesting_offl_bc
1241
1242	USE exchange_horiz_mod, &
1243	ONLY: exchange_horiz
1244
1245	INTEGER(iwp) :: i !< running index x-direction
1246	INTEGER(iwp) :: j !< running index y-direction
1247	INTEGER(iwp) :: k !< running index z-direction
1248	INTEGER(iwp) :: n !< running index for chemical species
1249
1250	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref !< reference profile for potential temperature
1251	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref_l !< reference profile for potential temperature on subdomain
1252	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref !< reference profile for mixing ratio
1253	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref_l !< reference profile for mixing ratio on subdomain
1254	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref !< reference profile for u-component
1255	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref_l !< reference profile for u-component on subdomain
1256	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref !< reference profile for v-component
1257	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref_l !< reference profile for v-component on subdomain
1258	REAL(wp), DIMENSION(nzb:nzt+1) :: var_1d !< pre-interpolated profile for LOD1 mode
1259
1260	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem !< reference profile for chemical species
1261	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem_l !< reference profile for chemical species on subdomain
1262
1263	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'start' )
1264
1265	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
1266	!
1267	!-- Initialize mean profiles, derived from boundary data, to zero.
1268	pt_ref = 0.0_wp
1269	q_ref = 0.0_wp
1270	u_ref = 0.0_wp
1271	v_ref = 0.0_wp
1272
1273	pt_ref_l = 0.0_wp
1274	q_ref_l = 0.0_wp
1275	u_ref_l = 0.0_wp
1276	v_ref_l = 0.0_wp
1277	!
1278	!-- If required, allocate temporary arrays to compute chemistry mean profiles
1279	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1280	ALLOCATE( ref_chem(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
1281	ALLOCATE( ref_chem_l(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
1282	ref_chem = 0.0_wp
1283	ref_chem_l = 0.0_wp
1284	ENDIF
1285	!
1286	!-- Set boundary conditions of u-, v-, w-component, as well as q, and pt.
1287	!-- Note, boundary values at the left boundary: i=-1 (v,w,pt,q) and i=0 (u), at the right boundary:
1288	!-- i=nxr+1 (all), at the south boundary: j=-1 (u,w,pt,q) and j=0 (v), at the north boundary:
1289	!-- j=nyn+1 (all).
1290	!-- Please note, at the left (for u) and south (for v) boundary, values for u and v are set also at
1291	!-- i/j=-1, since these values are used in boundary_conditions() to restore prognostic values.
1292	!-- Further, sum up data to calculate mean profiles from boundary data, used for Rayleigh damping.
1293	IF ( bc_dirichlet_l ) THEN
1294	!
1295	!-- u-component
1296	IF ( lod == 2 ) THEN
1297	DO j = nys, nyn
1298	DO k = nzb+1, nzt
1299	u(k,j,i_bound_u) = interpolate_in_time( nest_offl%u_l(0,k,j), &
1300	nest_offl%u_l(1,k,j), &
1301	fac_dt ) * &
1302	MERGE( 1.0_wp, 0.0_wp, &
1303	BTEST( wall_flags_total_0(k,j,i_bound_u), 1 ) )
1304	ENDDO
1305	u(:,j,i_bound_u-1) = u(:,j,i_bound_u)
1306	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1307	ENDDO
1308	ELSE
1309	!
1310	!-- Pre-interpolate profile before mapping onto the boundaries.
1311	DO k = nzb+1, nzt
1312	var_1d(k) = interpolate_in_time( nest_offl%u_l(0,k,1), &
1313	nest_offl%u_l(1,k,1), &
1314	fac_dt )
1315	ENDDO
1316	DO j = nys, nyn
1317	u(nzb+1:nzt,j,i_bound_u) = var_1d(nzb+1:nzt) * &
1318	MERGE( 1.0_wp, 0.0_wp, &
1319	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound_u), 1 ) )
1320	u(:,j,i_bound_u-1) = u(:,j,i_bound_u)
1321	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1322	ENDDO
1323	ENDIF
1324	!
1325	!-- w-component
1326	IF ( lod == 2 ) THEN
1327	DO j = nys, nyn
1328	DO k = nzb+1, nzt-1
1329	w(k,j,i_bound) = interpolate_in_time( nest_offl%w_l(0,k,j), &
1330	nest_offl%w_l(1,k,j), &
1331	fac_dt ) * &
1332	MERGE( 1.0_wp, 0.0_wp, &
1333	BTEST( wall_flags_total_0(k,j,i_bound), 3 ) )
1334	ENDDO
1335	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1336	ENDDO
1337	ELSE
1338	DO k = nzb+1, nzt-1
1339	var_1d(k) = interpolate_in_time( nest_offl%w_l(0,k,1), &
1340	nest_offl%w_l(1,k,1), &
1341	fac_dt )
1342	ENDDO
1343	DO j = nys, nyn
1344	w(nzb+1:nzt-1,j,i_bound) = var_1d(nzb+1:nzt-1) * &
1345	MERGE( 1.0_wp, 0.0_wp, &
1346	BTEST( wall_flags_total_0(nzb+1:nzt-1,j,i_bound), 3 ) )
1347	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1348	ENDDO
1349	ENDIF
1350	!
1351	!-- v-component
1352	IF ( lod == 2 ) THEN
1353	DO j = nysv, nyn
1354	DO k = nzb+1, nzt
1355	v(k,j,i_bound) = interpolate_in_time( nest_offl%v_l(0,k,j), &
1356	nest_offl%v_l(1,k,j), &
1357	fac_dt ) * &
1358	MERGE( 1.0_wp, 0.0_wp, &
1359	BTEST( wall_flags_total_0(k,j,i_bound), 2 ) )
1360	ENDDO
1361	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1362	ENDDO
1363	ELSE
1364	DO k = nzb+1, nzt
1365	var_1d(k) = interpolate_in_time( nest_offl%v_l(0,k,1), &
1366	nest_offl%v_l(1,k,1), &
1367	fac_dt )
1368	ENDDO
1369	DO j = nysv, nyn
1370	v(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt) * &
1371	MERGE( 1.0_wp, 0.0_wp, &
1372	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound), 2 ) )
1373	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1374	ENDDO
1375	ENDIF
1376	!
1377	!-- Potential temperature
1378	IF ( .NOT. neutral ) THEN
1379	IF ( lod == 2 ) THEN
1380	DO j = nys, nyn
1381	DO k = nzb+1, nzt
1382	pt(k,j,i_bound) = interpolate_in_time( nest_offl%pt_l(0,k,j), &
1383	nest_offl%pt_l(1,k,j), &
1384	fac_dt )
1385	ENDDO
1386	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1387	ENDDO
1388	ELSE
1389	DO k = nzb+1, nzt
1390	var_1d(k) = interpolate_in_time( nest_offl%pt_l(0,k,1), &
1391	nest_offl%pt_l(1,k,1), &
1392	fac_dt )
1393	ENDDO
1394	DO j = nys, nyn
1395	pt(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1396	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1397	ENDDO
1398	ENDIF
1399	ENDIF
1400	!
1401	!-- Humidity
1402	IF ( humidity ) THEN
1403	IF ( lod == 2 ) THEN
1404	DO j = nys, nyn
1405	DO k = nzb+1, nzt
1406	q(k,j,i_bound) = interpolate_in_time( nest_offl%q_l(0,k,j), &
1407	nest_offl%q_l(1,k,j), &
1408	fac_dt )
1409	ENDDO
1410	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1411	ENDDO
1412	ELSE
1413	DO k = nzb+1, nzt
1414	var_1d(k) = interpolate_in_time( nest_offl%q_l(0,k,1), &
1415	nest_offl%q_l(1,k,1), &
1416	fac_dt )
1417	ENDDO
1418	DO j = nys, nyn
1419	q(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1420	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1421	ENDDO
1422	ENDIF
1423	ENDIF
1424	!
1425	!-- Chemistry
1426	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1427	DO n = 1, UBOUND( chem_species, 1 )
1428	IF ( nest_offl%chem_from_file_l(n) ) THEN
1429	IF ( lod == 2 ) THEN
1430	DO j = nys, nyn
1431	DO k = nzb+1, nzt
1432	chem_species(n)%conc(k,j,i_bound) = interpolate_in_time( &
1433	nest_offl%chem_l(0,k,j,n), &
1434	nest_offl%chem_l(1,k,j,n), &
1435	fac_dt )
1436	ENDDO
1437	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1438	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1439	ENDDO
1440	ELSE
1441	DO k = nzb+1, nzt
1442	var_1d(k) = interpolate_in_time( nest_offl%chem_l(0,k,1,n), &
1443	nest_offl%chem_l(1,k,1,n), &
1444	fac_dt )
1445	ENDDO
1446	DO j = nys, nyn
1447	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1448	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1449	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1450	ENDDO
1451	ENDIF
1452	ENDIF
1453	ENDDO
1454	ENDIF
1455
1456	ENDIF
1457
1458	IF ( bc_dirichlet_r ) THEN
1459	!
1460	!-- u-component
1461	IF ( lod == 2 ) THEN
1462	DO j = nys, nyn
1463	DO k = nzb+1, nzt
1464	u(k,j,i_bound_u) = interpolate_in_time( nest_offl%u_r(0,k,j), &
1465	nest_offl%u_r(1,k,j), &
1466	fac_dt ) * &
1467	MERGE( 1.0_wp, 0.0_wp, &
1468	BTEST( wall_flags_total_0(k,j,i_bound_u), 1 ) )
1469	ENDDO
1470	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1471	ENDDO
1472	ELSE
1473	DO k = nzb+1, nzt
1474	var_1d(k) = interpolate_in_time( nest_offl%u_r(0,k,1), &
1475	nest_offl%u_r(1,k,1), &
1476	fac_dt )
1477	ENDDO
1478	DO j = nys, nyn
1479	u(nzb+1:nzt,j,i_bound_u) = var_1d(nzb+1:nzt) * &
1480	MERGE( 1.0_wp, 0.0_wp, &
1481	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound_u), 1 ) )
1482	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1483	ENDDO
1484	ENDIF
1485	!
1486	!-- w-component
1487	IF ( lod == 2 ) THEN
1488	DO j = nys, nyn
1489	DO k = nzb+1, nzt-1
1490	w(k,j,i_bound) = interpolate_in_time( nest_offl%w_r(0,k,j), &
1491	nest_offl%w_r(1,k,j), &
1492	fac_dt ) * &
1493	MERGE( 1.0_wp, 0.0_wp, &
1494	BTEST( wall_flags_total_0(k,j,i_bound), 3 ) )
1495	ENDDO
1496	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1497	ENDDO
1498	ELSE
1499	DO k = nzb+1, nzt-1
1500	var_1d(k) = interpolate_in_time( nest_offl%w_r(0,k,1), &
1501	nest_offl%w_r(1,k,1), &
1502	fac_dt )
1503	ENDDO
1504	DO j = nys, nyn
1505	w(nzb+1:nzt-1,j,i_bound) = var_1d(nzb+1:nzt-1) * &
1506	MERGE( 1.0_wp, 0.0_wp, &
1507	BTEST( wall_flags_total_0(nzb+1:nzt-1,j,i_bound), 3 ) )
1508	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1509	ENDDO
1510	ENDIF
1511	!
1512	!-- v-component
1513	IF ( lod == 2 ) THEN
1514	DO j = nysv, nyn
1515	DO k = nzb+1, nzt
1516	v(k,j,i_bound) = interpolate_in_time( nest_offl%v_r(0,k,j), &
1517	nest_offl%v_r(1,k,j), &
1518	fac_dt ) * &
1519	MERGE( 1.0_wp, 0.0_wp, &
1520	BTEST( wall_flags_total_0(k,j,i_bound), 2 ) )
1521	ENDDO
1522	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1523	ENDDO
1524	ELSE
1525	DO k = nzb+1, nzt
1526	var_1d(k) = interpolate_in_time( nest_offl%v_r(0,k,1), &
1527	nest_offl%v_r(1,k,1), &
1528	fac_dt )
1529	ENDDO
1530	DO j = nysv, nyn
1531	v(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt) * &
1532	MERGE( 1.0_wp, 0.0_wp, &
1533	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound), 2 ) )
1534	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1535	ENDDO
1536	ENDIF
1537	!
1538	!-- Potential temperature
1539	IF ( .NOT. neutral ) THEN
1540	IF ( lod == 2 ) THEN
1541	DO j = nys, nyn
1542	DO k = nzb+1, nzt
1543	pt(k,j,i_bound) = interpolate_in_time( nest_offl%pt_r(0,k,j), &
1544	nest_offl%pt_r(1,k,j), &
1545	fac_dt )
1546	ENDDO
1547	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1548	ENDDO
1549	ELSE
1550	DO k = nzb+1, nzt
1551	var_1d(k) = interpolate_in_time( nest_offl%pt_r(0,k,1), &
1552	nest_offl%pt_r(1,k,1), &
1553	fac_dt )
1554	ENDDO
1555	DO j = nys, nyn
1556	pt(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1557	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1558	ENDDO
1559	ENDIF
1560	ENDIF
1561	!
1562	!-- Humidity
1563	IF ( humidity ) THEN
1564	IF ( lod == 2 ) THEN
1565	DO j = nys, nyn
1566	DO k = nzb+1, nzt
1567	q(k,j,i_bound) = interpolate_in_time( nest_offl%q_r(0,k,j), &
1568	nest_offl%q_r(1,k,j), &
1569	fac_dt )
1570	ENDDO
1571	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1572	ENDDO
1573	ELSE
1574	DO k = nzb+1, nzt
1575	var_1d(k) = interpolate_in_time( nest_offl%q_r(0,k,1), &
1576	nest_offl%q_r(1,k,1), &
1577	fac_dt )
1578	ENDDO
1579	DO j = nys, nyn
1580	q(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1581	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1582	ENDDO
1583	ENDIF
1584	ENDIF
1585	!
1586	!-- Chemistry
1587	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1588	DO n = 1, UBOUND( chem_species, 1 )
1589	IF ( nest_offl%chem_from_file_r(n) ) THEN
1590	IF ( lod == 2 ) THEN
1591	DO j = nys, nyn
1592	DO k = nzb+1, nzt
1593	chem_species(n)%conc(k,j,i_bound) = interpolate_in_time( &
1594	nest_offl%chem_r(0,k,j,n), &
1595	nest_offl%chem_r(1,k,j,n), &
1596	fac_dt )
1597	ENDDO
1598	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1599	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1600	ENDDO
1601	ELSE
1602	DO k = nzb+1, nzt
1603	var_1d(k) = interpolate_in_time( nest_offl%chem_r(0,k,1,n), &
1604	nest_offl%chem_r(1,k,1,n), &
1605	fac_dt )
1606	ENDDO
1607	DO j = nys, nyn
1608	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1609	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1610	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1611	ENDDO
1612	ENDIF
1613	ENDIF
1614	ENDDO
1615	ENDIF
1616
1617	ENDIF
1618
1619	IF ( bc_dirichlet_n ) THEN
1620	!
1621	!-- v-component
1622	IF ( lod == 2 ) THEN
1623	DO i = nxl, nxr
1624	DO k = nzb+1, nzt
1625	v(k,j_bound_v,i) = interpolate_in_time( nest_offl%v_n(0,k,i), &
1626	nest_offl%v_n(1,k,i), &
1627	fac_dt ) * &
1628	MERGE( 1.0_wp, 0.0_wp, &
1629	BTEST( wall_flags_total_0(k,j_bound_v,i), 2 ) )
1630	ENDDO
1631	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1632	ENDDO
1633	ELSE
1634	DO k = nzb+1, nzt
1635	var_1d(k) = interpolate_in_time( nest_offl%v_n(0,k,1), &
1636	nest_offl%v_n(1,k,1), &
1637	fac_dt )
1638	ENDDO
1639	DO i = nxl, nxr
1640	v(nzb+1:nzt,j_bound_v,i) = var_1d(nzb+1:nzt) * &
1641	MERGE( 1.0_wp, 0.0_wp, &
1642	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound_v,i), 2 ) )
1643	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1644	ENDDO
1645	ENDIF
1646	!
1647	!-- w-component
1648	IF ( lod == 2 ) THEN
1649	DO i = nxl, nxr
1650	DO k = nzb+1, nzt-1
1651	w(k,j_bound,i) = interpolate_in_time( nest_offl%w_n(0,k,i), &
1652	nest_offl%w_n(1,k,i), &
1653	fac_dt ) * &
1654	MERGE( 1.0_wp, 0.0_wp, &
1655	BTEST( wall_flags_total_0(k,j_bound,i), 3 ) )
1656	ENDDO
1657	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1658	ENDDO
1659	ELSE
1660	DO k = nzb+1, nzt-1
1661	var_1d(k) = interpolate_in_time( nest_offl%w_n(0,k,1), &
1662	nest_offl%w_n(1,k,1), &
1663	fac_dt )
1664	ENDDO
1665	DO i = nxl, nxr
1666	w(nzb+1:nzt-1,j_bound,i) = var_1d(nzb+1:nzt-1) * &
1667	MERGE( 1.0_wp, 0.0_wp, &
1668	BTEST( wall_flags_total_0(nzb+1:nzt-1,j_bound,i), 3 ) )
1669	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1670	ENDDO
1671	ENDIF
1672	!
1673	!-- u-component
1674	IF ( lod == 2 ) THEN
1675	DO i = nxlu, nxr
1676	DO k = nzb+1, nzt
1677	u(k,j_bound,i) = interpolate_in_time( nest_offl%u_n(0,k,i), &
1678	nest_offl%u_n(1,k,i), &
1679	fac_dt ) * &
1680	MERGE( 1.0_wp, 0.0_wp, &
1681	BTEST( wall_flags_total_0(k,j_bound,i), 1 ) )
1682	ENDDO
1683	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1684	ENDDO
1685	ELSE
1686	DO k = nzb+1, nzt
1687	var_1d(k) = interpolate_in_time( nest_offl%u_n(0,k,1), &
1688	nest_offl%u_n(1,k,1), &
1689	fac_dt )
1690	ENDDO
1691	DO i = nxlu, nxr
1692	u(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt) * &
1693	MERGE( 1.0_wp, 0.0_wp, &
1694	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound,i), 1 ) )
1695	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1696	ENDDO
1697	ENDIF
1698	!
1699	!-- Potential temperature
1700	IF ( .NOT. neutral ) THEN
1701	IF ( lod == 2 ) THEN
1702	DO i = nxl, nxr
1703	DO k = nzb+1, nzt
1704	pt(k,j_bound,i) = interpolate_in_time( nest_offl%pt_n(0,k,i), &
1705	nest_offl%pt_n(1,k,i), &
1706	fac_dt )
1707	ENDDO
1708	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1709	ENDDO
1710	ELSE
1711	DO k = nzb+1, nzt
1712	var_1d(k) = interpolate_in_time( nest_offl%pt_n(0,k,1), &
1713	nest_offl%pt_n(1,k,1), &
1714	fac_dt )
1715	ENDDO
1716	DO i = nxl, nxr
1717	pt(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1718	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1719	ENDDO
1720	ENDIF
1721	ENDIF
1722	!
1723	!-- Humidity
1724	IF ( humidity ) THEN
1725	IF ( lod == 2 ) THEN
1726	DO i = nxl, nxr
1727	DO k = nzb+1, nzt
1728	q(k,j_bound,i) = interpolate_in_time( nest_offl%q_n(0,k,i), &
1729	nest_offl%q_n(1,k,i), &
1730	fac_dt )
1731	ENDDO
1732	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1733	ENDDO
1734	ELSE
1735	DO k = nzb+1, nzt
1736	var_1d(k) = interpolate_in_time( nest_offl%q_n(0,k,1), &
1737	nest_offl%q_n(1,k,1), &
1738	fac_dt )
1739	ENDDO
1740	DO i = nxl, nxr
1741	q(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1742	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1743	ENDDO
1744	ENDIF
1745	ENDIF
1746	!
1747	!-- Chemistry
1748	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1749	DO n = 1, UBOUND( chem_species, 1 )
1750	IF ( nest_offl%chem_from_file_n(n) ) THEN
1751	IF ( lod == 2 ) THEN
1752	DO i = nxl, nxr
1753	DO k = nzb+1, nzt
1754	chem_species(n)%conc(k,j_bound,i) = interpolate_in_time( &
1755	nest_offl%chem_n(0,k,i,n), &
1756	nest_offl%chem_n(1,k,i,n), &
1757	fac_dt )
1758	ENDDO
1759	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1760	+ chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1761	ENDDO
1762	ELSE
1763	DO k = nzb+1, nzt
1764	var_1d(k) = interpolate_in_time( nest_offl%chem_n(0,k,1,n), &
1765	nest_offl%chem_n(1,k,1,n), &
1766	fac_dt )
1767	ENDDO
1768	DO i = nxl, nxr
1769	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1770	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) + &
1771	chem_species(n) &
1772	%conc(nzb+1:nzt,j_bound,i)
1773	ENDDO
1774	ENDIF
1775	ENDIF
1776	ENDDO
1777	ENDIF
1778	ENDIF
1779
1780	IF ( bc_dirichlet_s ) THEN
1781	!
1782	!-- v-component
1783	IF ( lod == 2 ) THEN
1784	DO i = nxl, nxr
1785	DO k = nzb+1, nzt
1786	v(k,j_bound_v,i) = interpolate_in_time( nest_offl%v_s(0,k,i), &
1787	nest_offl%v_s(1,k,i), &
1788	fac_dt ) * &
1789	MERGE( 1.0_wp, 0.0_wp, &
1790	BTEST( wall_flags_total_0(k,j_bound_v,i), 2 ) )
1791	ENDDO
1792	v(:,j_bound_v-1,i) = v(:,j_bound_v,i)
1793	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1794	ENDDO
1795	ELSE
1796	DO k = nzb+1, nzt
1797	var_1d(k) = interpolate_in_time( nest_offl%v_s(0,k,1), &
1798	nest_offl%v_s(1,k,1), &
1799	fac_dt )
1800	ENDDO
1801	DO i = nxl, nxr
1802	v(nzb+1:nzt,j_bound_v,i) = var_1d(nzb+1:nzt) * &
1803	MERGE( 1.0_wp, 0.0_wp, &
1804	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound_v,i), 2 ) )
1805	v(:,j_bound_v-1,i) = v(:,j_bound_v,i)
1806	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1807	ENDDO
1808	ENDIF
1809	!
1810	!-- w-component
1811	IF ( lod == 2 ) THEN
1812	DO i = nxl, nxr
1813	DO k = nzb+1, nzt-1
1814	w(k,j_bound,i) = interpolate_in_time( nest_offl%w_s(0,k,i), &
1815	nest_offl%w_s(1,k,i), &
1816	fac_dt ) * &
1817	MERGE( 1.0_wp, 0.0_wp, &
1818	BTEST( wall_flags_total_0(k,j_bound,i), 3 ) )
1819	ENDDO
1820	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1821	ENDDO
1822	ELSE
1823	DO k = nzb+1, nzt-1
1824	var_1d(k) = interpolate_in_time( nest_offl%w_s(0,k,1), &
1825	nest_offl%w_s(1,k,1), &
1826	fac_dt )
1827	ENDDO
1828	DO i = nxl, nxr
1829	w(nzb+1:nzt-1,j_bound,i) = var_1d(nzb+1:nzt-1) * &
1830	MERGE( 1.0_wp, 0.0_wp, &
1831	BTEST( wall_flags_total_0(nzb+1:nzt-1,j_bound,i), 3 ) )
1832	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1833	ENDDO
1834	ENDIF
1835	!
1836	!-- u-component
1837	IF ( lod == 2 ) THEN
1838	DO i = nxlu, nxr
1839	DO k = nzb+1, nzt
1840	u(k,j_bound,i) = interpolate_in_time( nest_offl%u_s(0,k,i), &
1841	nest_offl%u_s(1,k,i), &
1842	fac_dt ) * &
1843	MERGE( 1.0_wp, 0.0_wp, &
1844	BTEST( wall_flags_total_0(k,j_bound,i), 1 ) )
1845	ENDDO
1846	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1847	ENDDO
1848	ELSE
1849	DO k = nzb+1, nzt
1850	var_1d(k) = interpolate_in_time( nest_offl%u_s(0,k,1), &
1851	nest_offl%u_s(1,k,1), &
1852	fac_dt )
1853	ENDDO
1854	DO i = nxlu, nxr
1855	u(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt) * &
1856	MERGE( 1.0_wp, 0.0_wp, &
1857	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound,i), 1 ) )
1858	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1859	ENDDO
1860	ENDIF
1861	!
1862	!-- Potential temperature
1863	IF ( .NOT. neutral ) THEN
1864	IF ( lod == 2 ) THEN
1865	DO i = nxl, nxr
1866	DO k = nzb+1, nzt
1867	pt(k,j_bound,i) = interpolate_in_time( nest_offl%pt_s(0,k,i), &
1868	nest_offl%pt_s(1,k,i), &
1869	fac_dt )
1870	ENDDO
1871	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1872	ENDDO
1873	ELSE
1874	DO k = nzb+1, nzt
1875	var_1d(k) = interpolate_in_time( nest_offl%pt_s(0,k,1), &
1876	nest_offl%pt_s(1,k,1), &
1877	fac_dt )
1878	ENDDO
1879	DO i = nxl, nxr
1880	pt(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1881	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1882	ENDDO
1883	ENDIF
1884	ENDIF
1885	!
1886	!-- Humidity
1887	IF ( humidity ) THEN
1888	IF ( lod == 2 ) THEN
1889	DO i = nxl, nxr
1890	DO k = nzb+1, nzt
1891	q(k,j_bound,i) = interpolate_in_time( nest_offl%q_s(0,k,i), &
1892	nest_offl%q_s(1,k,i), &
1893	fac_dt )
1894	ENDDO
1895	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1896	ENDDO
1897	ELSE
1898	DO k = nzb+1, nzt
1899	var_1d(k) = interpolate_in_time( nest_offl%q_s(0,k,1), &
1900	nest_offl%q_s(1,k,1), &
1901	fac_dt )
1902	ENDDO
1903	DO i = nxl, nxr
1904	q(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1905	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1906	ENDDO
1907	ENDIF
1908	ENDIF
1909	!
1910	!-- Chemistry
1911	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1912	DO n = 1, UBOUND( chem_species, 1 )
1913	IF ( nest_offl%chem_from_file_s(n) ) THEN
1914	IF ( lod == 2 ) THEN
1915	DO i = nxl, nxr
1916	DO k = nzb+1, nzt
1917	chem_species(n)%conc(k,j_bound,i) = interpolate_in_time( &
1918	nest_offl%chem_s(0,k,i,n), &
1919	nest_offl%chem_s(1,k,i,n), &
1920	fac_dt )
1921	ENDDO
1922	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1923	+ chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1924	ENDDO
1925	ELSE
1926	DO k = nzb+1, nzt
1927	var_1d(k) = interpolate_in_time( nest_offl%chem_s(0,k,1,n), &
1928	nest_offl%chem_s(1,k,1,n), &
1929	fac_dt )
1930	ENDDO
1931	DO i = nxl, nxr
1932	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1933	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) + &
1934	chem_species(n) &
1935	%conc(nzb+1:nzt,j_bound,i)
1936	ENDDO
1937	ENDIF
1938	ENDIF
1939	ENDDO
1940	ENDIF
1941	ENDIF
1942	!
1943	!-- Top boundary
1944	!-- u-component
1945	IF ( lod == 2 ) THEN
1946	DO i = nxlu, nxr
1947	DO j = nys, nyn
1948	u(nzt+1,j,i) = interpolate_in_time( nest_offl%u_top(0,j,i), &
1949	nest_offl%u_top(1,j,i), &
1950	fac_dt ) * &
1951	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt+1,j,i), 1 ) )
1952	u_ref_l(nzt+1) = u_ref_l(nzt+1) + u(nzt+1,j,i)
1953	ENDDO
1954	ENDDO
1955	ELSE
1956	var_1d(nzt+1) = interpolate_in_time( nest_offl%u_top(0,1,1), &
1957	nest_offl%u_top(1,1,1), &
1958	fac_dt )
1959	u(nzt+1,nys:nyn,nxlu:nxr) = var_1d(nzt+1) * &
1960	MERGE( 1.0_wp, 0.0_wp, &
1961	BTEST( wall_flags_total_0(nzt+1,nys:nyn,nxlu:nxr), 1 ) )
1962	u_ref_l(nzt+1) = u_ref_l(nzt+1) + SUM( u(nzt+1,nys:nyn,nxlu:nxr) )
1963	ENDIF
1964	!
1965	!-- For left boundary set boundary condition for u-component also at top grid point.
1966	!-- Note, this has no effect on the numeric solution, only for data output.
1967	IF ( bc_dirichlet_l ) u(nzt+1,:,nxl) = u(nzt+1,:,nxlu)
1968	!
1969	!-- v-component
1970	IF ( lod == 2 ) THEN
1971	DO i = nxl, nxr
1972	DO j = nysv, nyn
1973	v(nzt+1,j,i) = interpolate_in_time( nest_offl%v_top(0,j,i), &
1974	nest_offl%v_top(1,j,i), &
1975	fac_dt ) * &
1976	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt+1,j,i), 2 ) )
1977	v_ref_l(nzt+1) = v_ref_l(nzt+1) + v(nzt+1,j,i)
1978	ENDDO
1979	ENDDO
1980	ELSE
1981	var_1d(nzt+1) = interpolate_in_time( nest_offl%v_top(0,1,1), &
1982	nest_offl%v_top(1,1,1), &
1983	fac_dt )
1984	v(nzt+1,nysv:nyn,nxl:nxr) = var_1d(nzt+1) * &
1985	MERGE( 1.0_wp, 0.0_wp, &
1986	BTEST( wall_flags_total_0(nzt+1,nysv:nyn,nxl:nxr), 2 ) )
1987	v_ref_l(nzt+1) = v_ref_l(nzt+1) + SUM( v(nzt+1,nysv:nyn,nxl:nxr) )
1988	ENDIF
1989	!
1990	!-- For south boundary set boundary condition for v-component also at top grid point.
1991	!-- Note, this has no effect on the numeric solution, only for data output.
1992	IF ( bc_dirichlet_s ) v(nzt+1,nys,:) = v(nzt+1,nysv,:)
1993	!
1994	!-- w-component
1995	IF ( lod == 2 ) THEN
1996	DO i = nxl, nxr
1997	DO j = nys, nyn
1998	w(nzt,j,i) = interpolate_in_time( nest_offl%w_top(0,j,i), &
1999	nest_offl%w_top(1,j,i), &
2000	fac_dt ) * &
2001	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt,j,i), 3 ) )
2002	w(nzt+1,j,i) = w(nzt,j,i)
2003	ENDDO
2004	ENDDO
2005	ELSE
2006	var_1d(nzt) = interpolate_in_time( nest_offl%w_top(0,1,1), &
2007	nest_offl%w_top(1,1,1), &
2008	fac_dt )
2009	w(nzt,nys:nyn,nxl:nxr) = var_1d(nzt) * &
2010	MERGE( 1.0_wp, 0.0_wp, &
2011	BTEST( wall_flags_total_0(nzt,nys:nyn,nxl:nxr), 3 ) )
2012	w(nzt+1,nys:nyn,nxl:nxr) = w(nzt,nys:nyn,nxl:nxr)
2013	ENDIF
2014	!
2015	!-- Potential temperture
2016	IF ( .NOT. neutral ) THEN
2017	IF ( lod == 2 ) THEN
2018	DO i = nxl, nxr
2019	DO j = nys, nyn
2020	pt(nzt+1,j,i) = interpolate_in_time( nest_offl%pt_top(0,j,i), &
2021	nest_offl%pt_top(1,j,i), &
2022	fac_dt )
2023	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + pt(nzt+1,j,i)
2024	ENDDO
2025	ENDDO
2026	ELSE
2027	var_1d(nzt+1) = interpolate_in_time( nest_offl%pt_top(0,1,1), &
2028	nest_offl%pt_top(1,1,1), &
2029	fac_dt )
2030	pt(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2031	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + SUM( pt(nzt+1,nys:nyn,nxl:nxr) )
2032	ENDIF
2033	ENDIF
2034	!
2035	!-- humidity
2036	IF ( humidity ) THEN
2037	IF ( lod == 2 ) THEN
2038	DO i = nxl, nxr
2039	DO j = nys, nyn
2040	q(nzt+1,j,i) = interpolate_in_time( nest_offl%q_top(0,j,i), &
2041	nest_offl%q_top(1,j,i), &
2042	fac_dt )
2043	q_ref_l(nzt+1) = q_ref_l(nzt+1) + q(nzt+1,j,i)
2044	ENDDO
2045	ENDDO
2046	ELSE
2047	var_1d(nzt+1) = interpolate_in_time( nest_offl%q_top(0,1,1), &
2048	nest_offl%q_top(1,1,1), &
2049	fac_dt )
2050	q(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2051	q_ref_l(nzt+1) = q_ref_l(nzt+1) + SUM( q(nzt+1,nys:nyn,nxl:nxr) )
2052	ENDIF
2053	ENDIF
2054
2055	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2056	DO n = 1, UBOUND( chem_species, 1 )
2057	IF ( nest_offl%chem_from_file_t(n) ) THEN
2058	IF ( lod == 2 ) THEN
2059	DO i = nxl, nxr
2060	DO j = nys, nyn
2061	chem_species(n)%conc(nzt+1,j,i) = interpolate_in_time( &
2062	nest_offl%chem_top(0,j,i,n), &
2063	nest_offl%chem_top(1,j,i,n), &
2064	fac_dt )
2065	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + chem_species(n)%conc(nzt+1,j,i)
2066	ENDDO
2067	ENDDO
2068	ELSE
2069	var_1d(nzt+1) = interpolate_in_time( nest_offl%chem_top(0,1,1,n), &
2070	nest_offl%chem_top(1,1,1,n), &
2071	fac_dt )
2072	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2073	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + &
2074	SUM( chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) )
2075	ENDIF
2076	ENDIF
2077	ENDDO
2078	ENDIF
2079	!
2080	!-- Moreover, set Neumann boundary condition for subgrid-scale TKE, passive scalar, dissipation, and
2081	!-- chemical species if required.
2082	IF ( rans_mode .AND. rans_tke_e ) THEN
2083	IF ( bc_dirichlet_l ) diss(:,:,nxl-1) = diss(:,:,nxl)
2084	IF ( bc_dirichlet_r ) diss(:,:,nxr+1) = diss(:,:,nxr)
2085	IF ( bc_dirichlet_s ) diss(:,nys-1,:) = diss(:,nys,:)
2086	IF ( bc_dirichlet_n ) diss(:,nyn+1,:) = diss(:,nyn,:)
2087	ENDIF
2088	! IF ( .NOT. constant_diffusion ) THEN
2089	! IF ( bc_dirichlet_l ) e(:,:,nxl-1) = e(:,:,nxl)
2090	! IF ( bc_dirichlet_r ) e(:,:,nxr+1) = e(:,:,nxr)
2091	! IF ( bc_dirichlet_s ) e(:,nys-1,:) = e(:,nys,:)
2092	! IF ( bc_dirichlet_n ) e(:,nyn+1,:) = e(:,nyn,:)
2093	! e(nzt+1,:,:) = e(nzt,:,:)
2094	! ENDIF
2095	! IF ( passive_scalar ) THEN
2096	! IF ( bc_dirichlet_l ) s(:,:,nxl-1) = s(:,:,nxl)
2097	! IF ( bc_dirichlet_r ) s(:,:,nxr+1) = s(:,:,nxr)
2098	! IF ( bc_dirichlet_s ) s(:,nys-1,:) = s(:,nys,:)
2099	! IF ( bc_dirichlet_n ) s(:,nyn+1,:) = s(:,nyn,:)
2100	! ENDIF
2101
2102	CALL exchange_horiz( u, nbgp )
2103	CALL exchange_horiz( v, nbgp )
2104	CALL exchange_horiz( w, nbgp )
2105	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
2106	IF ( humidity ) CALL exchange_horiz( q, nbgp )
2107	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2108	DO n = 1, UBOUND( chem_species, 1 )
2109	!
2110	!-- Do local exchange only when necessary, i.e. when data is coming from dynamic file.
2111	IF ( nest_offl%chem_from_file_t(n) ) CALL exchange_horiz( chem_species(n)%conc, nbgp )
2112	ENDDO
2113	ENDIF
2114	!
2115	!-- Set top boundary condition at all horizontal grid points, also at the lateral boundary grid
2116	!-- points.
2117	w(nzt+1,:,:) = w(nzt,:,:)
2118	!
2119	!-- Offline nesting for salsa
2120	IF ( salsa ) CALL salsa_nesting_offl_bc
2121	!
2122	!-- Calculate the mean profiles. These are later stored on u_init, v_init, etc., in order to adjust
2123	!-- the Rayleigh damping under time-evolving atmospheric conditions accordingly - damping against
2124	!-- the representative mean profiles, not against the initial profiles. Note, in LOD = 1 case no
2125	!-- averaging is required.
2126	#if defined( __parallel )
2127	CALL MPI_ALLREDUCE( u_ref_l, u_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2128	CALL MPI_ALLREDUCE( v_ref_l, v_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2129	IF ( humidity ) THEN
2130	CALL MPI_ALLREDUCE( q_ref_l, q_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2131	ENDIF
2132	IF ( .NOT. neutral ) THEN
2133	CALL MPI_ALLREDUCE( pt_ref_l, pt_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2134	ENDIF
2135	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2136	CALL MPI_ALLREDUCE( ref_chem_l, ref_chem, ( nzt+1-nzb+1 ) * SIZE( ref_chem(nzb,:) ), &
2137	MPI_REAL, MPI_SUM, comm2d, ierr )
2138	ENDIF
2139	#else
2140	u_ref = u_ref_l
2141	v_ref = v_ref_l
2142	IF ( humidity ) q_ref = q_ref_l
2143	IF ( .NOT. neutral ) pt_ref = pt_ref_l
2144	IF ( air_chemistry .AND. nesting_offline_chem ) ref_chem = ref_chem_l
2145	#endif
2146	!
2147	!-- Average data. Note, reference profiles up to nzt are derived from lateral boundaries, at the
2148	!-- model top it is derived from the top boundary. Thus, number of input data is different from
2149	!-- nzb:nzt compared to nzt+1.
2150	!-- Derived from lateral boundaries.
2151	u_ref(nzb:nzt) = u_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx ), KIND = wp )
2152	v_ref(nzb:nzt) = v_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + nx + 1 ), KIND = wp )
2153	IF ( humidity ) &
2154	q_ref(nzb:nzt) = q_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2155	IF ( .NOT. neutral ) &
2156	pt_ref(nzb:nzt) = pt_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2157	IF ( air_chemistry .AND. nesting_offline_chem ) &
2158	ref_chem(nzb:nzt,:) = ref_chem(nzb:nzt,:) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2159	!
2160	!-- Derived from top boundary.
2161	u_ref(nzt+1) = u_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx ), KIND = wp )
2162	v_ref(nzt+1) = v_ref(nzt+1) / REAL( ( ny ) * ( nx + 1 ), KIND = wp )
2163	IF ( humidity ) &
2164	q_ref(nzt+1) = q_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), KIND = wp )
2165	IF ( .NOT. neutral ) &
2166	pt_ref(nzt+1) = pt_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), KIND = wp )
2167	IF ( air_chemistry .AND. nesting_offline_chem ) &
2168	ref_chem(nzt+1,:) = ref_chem(nzt+1,:) / REAL( ( ny + 1 ) * ( nx + 1 ),KIND = wp )
2169	!
2170	!-- Write onto init profiles, which are used for damping. Also set lower boundary condition for
2171	!-- scalars (not required for u and v as these are zero at k=nzb).
2172	u_init = u_ref
2173	v_init = v_ref
2174	IF ( humidity ) THEN
2175	q_init = q_ref
2176	q_init(nzb) = q_init(nzb+1)
2177	ENDIF
2178	IF ( .NOT. neutral ) THEN
2179	pt_init = pt_ref
2180	pt_init(nzb) = pt_init(nzb+1)
2181	ENDIF
2182
2183	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2184	DO n = 1, UBOUND( chem_species, 1 )
2185	IF ( nest_offl%chem_from_file_t(n) ) THEN
2186	chem_species(n)%conc_pr_init(:) = ref_chem(:,n)
2187	chem_species(n)%conc_pr_init(nzb) = chem_species(n)%conc_pr_init(nzb+1)
2188	ENDIF
2189	ENDDO
2190	ENDIF
2191	IF ( ALLOCATED( ref_chem ) ) DEALLOCATE( ref_chem )
2192	IF ( ALLOCATED( ref_chem_l ) ) DEALLOCATE( ref_chem_l )
2193	!
2194	!-- Further, adjust Rayleigh damping height in case of time-changing conditions.
2195	!-- Therefore, calculate boundary-layer depth first.
2196	CALL nesting_offl_calc_zi
2197	CALL adjust_sponge_layer
2198
2199	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
2200
2201	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'end' )
2202
2203
2204	END SUBROUTINE nesting_offl_bc
2205
2206	!--------------------------------------------------------------------------------------------------!
2207	! Description:
2208	!--------------------------------------------------------------------------------------------------!
2209	!> Update of the geostrophic wind components. Note, currently this routine is not invoked.
2210	!--------------------------------------------------------------------------------------------------!
2211	SUBROUTINE nesting_offl_geostrophic_wind
2212
2213	INTEGER(iwp) :: k
2214	!
2215	!-- Update geostrophic wind components from dynamic input file.
2216	DO k = nzb+1, nzt
2217	ug(k) = interpolate_in_time( nest_offl%ug(0,k), nest_offl%ug(1,k), fac_dt )
2218	vg(k) = interpolate_in_time( nest_offl%vg(0,k), nest_offl%vg(1,k), fac_dt )
2219	ENDDO
2220	ug(nzt+1) = ug(nzt)
2221	vg(nzt+1) = vg(nzt)
2222
2223	END SUBROUTINE nesting_offl_geostrophic_wind
2224
2225	!--------------------------------------------------------------------------------------------------!
2226	! Description:
2227	!--------------------------------------------------------------------------------------------------!
2228	!> Determine the interpolation constant for time interpolation. The calculation is separated from
2229	!> the nesting_offl_bc and nesting_offl_geostrophic_wind in order to be independent on the order of
2230	!> calls.
2231	!--------------------------------------------------------------------------------------------------!
2232	SUBROUTINE nesting_offl_interpolation_factor
2233	!
2234	!-- Determine interpolation factor and limit it to 1. This is because t+dt can slightly exceed
2235	!-- time(tind_p) before boundary data is updated again.
2236	fac_dt = ( time_since_reference_point - nest_offl%time(nest_offl%tind) + dt_3d ) / &
2237	( nest_offl%time(nest_offl%tind_p) - nest_offl%time(nest_offl%tind) )
2238
2239	fac_dt = MIN( 1.0_wp, fac_dt )
2240
2241	END SUBROUTINE nesting_offl_interpolation_factor
2242
2243	!--------------------------------------------------------------------------------------------------!
2244	! Description:
2245	!--------------------------------------------------------------------------------------------------!
2246	!> Calculates the boundary-layer depth from the boundary data, according to bulk-Richardson
2247	!> criterion.
2248	!--------------------------------------------------------------------------------------------------!
2249	SUBROUTINE nesting_offl_calc_zi
2250
2251	INTEGER(iwp) :: i !< loop index in x-direction
2252	INTEGER(iwp) :: j !< loop index in y-direction
2253	INTEGER(iwp) :: k !< loop index in z-direction
2254	INTEGER(iwp) :: k_max_loc !< index of maximum wind speed along z-direction
2255	INTEGER(iwp) :: k_surface !< topography top index in z-direction
2256	INTEGER(iwp) :: num_boundary_gp_non_cyclic !< number of non-cyclic boundaries, used for averaging ABL depth
2257	INTEGER(iwp) :: num_boundary_gp_non_cyclic_l !< number of non-cyclic boundaries, used for averaging ABL depth
2258
2259	REAL(wp) :: ri_bulk !< bulk Richardson number
2260	REAL(wp) :: ri_bulk_crit = 0.25_wp !< critical bulk Richardson number
2261	REAL(wp) :: topo_max !< maximum topography level in model domain
2262	REAL(wp) :: topo_max_l !< maximum topography level in subdomain
2263	REAL(wp) :: vpt_surface !< near-surface virtual potential temperature
2264	REAL(wp) :: zi_l !< mean boundary-layer depth on subdomain
2265	REAL(wp) :: zi_local !< local boundary-layer depth
2266
2267	REAL(wp), DIMENSION(nzb:nzt+1) :: vpt_col !< vertical profile of virtual potential temperature at (j,i)-grid point
2268	REAL(wp), DIMENSION(nzb:nzt+1) :: uv_abs !< vertical profile of horizontal wind speed at (j,i)-grid point
2269
2270
2271	!
2272	!-- Calculate mean boundary-layer height from boundary data.
2273	!-- Start with the left and right boundaries.
2274	zi_l = 0.0_wp
2275	num_boundary_gp_non_cyclic_l = 0
2276	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2277	!
2278	!-- Sum-up and store number of boundary grid points used for averaging ABL depth
2279	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + nxr - nxl + 1
2280	!
2281	!-- Determine index along x. Please note, index indicates boundary grid point for scalars.
2282	i = MERGE( -1, nxr + 1, bc_dirichlet_l )
2283
2284	DO j = nys, nyn
2285	!
2286	!-- Determine topography top index at current (j,i) index
2287	k_surface = topo_top_ind(j,i,0)
2288	!
2289	!-- Pre-compute surface virtual temperature. Therefore, use 2nd prognostic level according to
2290	!-- Heinze et al. (2017).
2291	IF ( humidity ) THEN
2292	vpt_surface = pt(k_surface+2,j,i) * ( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
2293	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
2294	ELSE
2295	vpt_surface = pt(k_surface+2,j,i)
2296	vpt_col = pt(:,j,i)
2297	ENDIF
2298	!
2299	!-- Calculate local boundary layer height from bulk Richardson number, i.e. the height where
2300	!-- the bulk Richardson number exceeds its critical value of 0.25
2301	!-- (according to Heinze et al., 2017).
2302	!-- Note, no interpolation of u- and v-component is made, as both are mainly mean inflow
2303	!-- profiles with very small spatial variation.
2304	!-- Add a safety factor in case the velocity term becomes zero. This may happen if overhanging
2305	!-- 3D structures are directly located at the boundary, where velocity inside the building is
2306	!-- zero (k_surface is the index of the lowest upward-facing surface).
2307	uv_abs(:) = SQRT( MERGE( u(:,j,i+1), u(:,j,i), bc_dirichlet_l )2 + v(:,j,i)2 )
2308	!
2309	!-- Determine index of the maximum wind speed
2310	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
2311
2312	zi_local = 0.0_wp
2313	DO k = k_surface+1, nzt
2314	ri_bulk = zu(k) * g / vpt_surface * &
2315	( vpt_col(k) - vpt_surface ) / ( uv_abs(k) + 1E-5_wp )
2316	!
2317	!-- Check if critical Richardson number is exceeded. Further, check if there is a maxium in
2318	!-- the wind profile in order to detect also ABL heights in the stable boundary layer.
2319	IF ( zi_local == 0.0_wp .AND. ( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
2320	zi_local = zu(k)
2321	ENDDO
2322	!
2323	!-- Assure that the minimum local boundary-layer depth is at least at the second vertical grid
2324	!-- level.
2325	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
2326
2327	ENDDO
2328
2329	ENDIF
2330	!
2331	!-- Do the same at the north and south boundaries.
2332	IF ( bc_dirichlet_s .OR. bc_dirichlet_n ) THEN
2333
2334	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + nxr - nxl + 1
2335
2336	j = MERGE( -1, nyn + 1, bc_dirichlet_s )
2337
2338	DO i = nxl, nxr
2339	k_surface = topo_top_ind(j,i,0)
2340
2341	IF ( humidity ) THEN
2342	vpt_surface = pt(k_surface+2,j,i) * ( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
2343	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
2344	ELSE
2345	vpt_surface = pt(k_surface+2,j,i)
2346	vpt_col = pt(:,j,i)
2347	ENDIF
2348
2349	uv_abs(:) = SQRT( u(:,j,i)2 + MERGE( v(:,j+1,i), v(:,j,i), bc_dirichlet_s )2 )
2350	!
2351	!-- Determine index of the maximum wind speed
2352	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
2353
2354	zi_local = 0.0_wp
2355	DO k = k_surface+1, nzt
2356	ri_bulk = zu(k) * g / vpt_surface * &
2357	( vpt_col(k) - vpt_surface ) / ( uv_abs(k) + 1E-5_wp )
2358	!
2359	!-- Check if critical Richardson number is exceeded. Further, check if there is a maxium in
2360	!-- the wind profile in order to detect also ABL heights in the stable boundary layer.
2361	IF ( zi_local == 0.0_wp .AND. ( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
2362	zi_local = zu(k)
2363	ENDDO
2364	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
2365
2366	ENDDO
2367
2368	ENDIF
2369
2370	#if defined( __parallel )
2371	CALL MPI_ALLREDUCE( zi_l, zi_ribulk, 1, MPI_REAL, MPI_SUM, comm2d, ierr )
2372	CALL MPI_ALLREDUCE( num_boundary_gp_non_cyclic_l, num_boundary_gp_non_cyclic, &
2373	1, MPI_INTEGER, MPI_SUM, comm2d, ierr )
2374	#else
2375	zi_ribulk = zi_l
2376	num_boundary_gp_non_cyclic = num_boundary_gp_non_cyclic_l
2377	#endif
2378	zi_ribulk = zi_ribulk / REAL( num_boundary_gp_non_cyclic, KIND = wp )
2379	!
2380	!-- Finally, check if boundary layer depth is not below the any topography.
2381	!-- zi_ribulk will be used to adjust rayleigh damping height, i.e. the lower level of the sponge
2382	!-- layer, as well as to adjust the synthetic turbulence generator accordingly. If Rayleigh damping
2383	!-- would be applied near buildings, etc., this would spoil the simulation results.
2384	topo_max_l = zw(MAXVAL( topo_top_ind(nys:nyn,nxl:nxr,0) ))
2385
2386	#if defined( __parallel )
2387	CALL MPI_ALLREDUCE( topo_max_l, topo_max, 1, MPI_REAL, MPI_MAX, comm2d, ierr )
2388	#else
2389	topo_max = topo_max_l
2390	#endif
2391	! zi_ribulk = MAX( zi_ribulk, topo_max )
2392
2393	END SUBROUTINE nesting_offl_calc_zi
2394
2395
2396	!--------------------------------------------------------------------------------------------------!
2397	! Description:
2398	!--------------------------------------------------------------------------------------------------!
2399	!> Adjust the height where the rayleigh damping starts, i.e. the lower level of the sponge layer.
2400	!--------------------------------------------------------------------------------------------------!
2401	SUBROUTINE adjust_sponge_layer
2402
2403	INTEGER(iwp) :: k !< loop index in z-direction
2404
2405	REAL(wp) :: rdh !< updated Rayleigh damping height
2406
2407
2408	IF ( rayleigh_damping_height > 0.0_wp .AND. rayleigh_damping_factor > 0.0_wp ) THEN
2409	!
2410	!-- Update Rayleigh-damping height and re-calculate height-depending damping coefficients.
2411	!-- Assure that rayleigh damping starts well above the boundary layer.
2412	rdh = MIN( MAX( zi_ribulk * 1.3_wp, 10.0_wp * dz(1) ), &
2413	0.8_wp * zu(nzt), rayleigh_damping_height )
2414	!
2415	!-- Update Rayleigh damping factor
2416	DO k = nzb+1, nzt
2417	IF ( zu(k) >= rdh ) THEN
2418	rdf(k) = rayleigh_damping_factor * &
2419	( SIN( pi * 0.5_wp * ( zu(k) - rdh ) / ( zu(nzt) - rdh ) ) )**2
2420	ENDIF
2421	ENDDO
2422	rdf_sc = rdf
2423
2424	ENDIF
2425
2426	END SUBROUTINE adjust_sponge_layer
2427
2428	!--------------------------------------------------------------------------------------------------!
2429	! Description:
2430	! ------------
2431	!> Performs consistency checks
2432	!--------------------------------------------------------------------------------------------------!
2433	SUBROUTINE nesting_offl_check_parameters
2434	!
2435	!-- Check if offline nesting is applied in nested child domain.
2436	IF ( nesting_offline .AND. child_domain ) THEN
2437	message_string = 'Offline nesting is only applicable in root model.'
2438	CALL message( 'offline_nesting_check_parameters', 'PA0622', 1, 2, 0, 6, 0 )
2439	ENDIF
2440
2441	END SUBROUTINE nesting_offl_check_parameters
2442
2443	!--------------------------------------------------------------------------------------------------!
2444	! Description:
2445	! ------------
2446	!> Reads the parameter list nesting_offl_parameters
2447	!--------------------------------------------------------------------------------------------------!
2448	SUBROUTINE nesting_offl_parin
2449
2450	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
2451
2452
2453	NAMELIST /nesting_offl_parameters/ nesting_offline
2454
2455	line = ' '
2456
2457	!
2458	!-- Try to find stg package
2459	REWIND ( 11 )
2460	line = ' '
2461	DO WHILE ( INDEX( line, '&nesting_offl_parameters' ) == 0 )
2462	READ ( 11, '(A)', END=20 ) line
2463	ENDDO
2464	BACKSPACE ( 11 )
2465
2466	!
2467	!-- Read namelist
2468	READ ( 11, nesting_offl_parameters, ERR = 10, END = 20 )
2469
2470	GOTO 20
2471
2472	10 BACKSPACE( 11 )
2473	READ( 11 , '(A)') line
2474	CALL parin_fail_message( 'nesting_offl_parameters', line )
2475
2476	20 CONTINUE
2477
2478
2479	END SUBROUTINE nesting_offl_parin
2480
2481	!--------------------------------------------------------------------------------------------------!
2482	! Description:
2483	! ------------
2484	!> Writes information about offline nesting into HEADER file
2485	!--------------------------------------------------------------------------------------------------!
2486	SUBROUTINE nesting_offl_header ( io )
2487
2488	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
2489
2490	WRITE ( io, 1 )
2491	IF ( nesting_offline ) THEN
2492	WRITE ( io, 3 )
2493	ELSE
2494	WRITE ( io, 2 )
2495	ENDIF
2496
2497	1 FORMAT (//' Offline nesting in COSMO model:'/' -------------------------------'/)
2498	2 FORMAT (' --> No offlince nesting is used (default) ')
2499	3 FORMAT (' --> Offlince nesting is used. Boundary data is read from dynamic input file ')
2500
2501	END SUBROUTINE nesting_offl_header
2502
2503	!--------------------------------------------------------------------------------------------------!
2504	! Description:
2505	! ------------
2506	!> Allocate arrays used to read boundary data from NetCDF file and initialize boundary data.
2507	!--------------------------------------------------------------------------------------------------!
2508	SUBROUTINE nesting_offl_init
2509
2510	INTEGER(iwp) :: i !< loop index for x-direction
2511	INTEGER(iwp) :: j !< loop index for y-direction
2512	INTEGER(iwp) :: n !< running index for chemical species
2513
2514	!
2515	!-- Before arrays for the boundary data are allocated, the LOD of the dynamic input data at the
2516	!-- boundaries is read.
2517	#if defined ( __netcdf )
2518	!
2519	!-- Open file in read-only mode
2520	CALL open_read_file( TRIM( input_file_dynamic ) // TRIM( coupling_char ), pids_id )
2521	!
2522	!-- Read attributes for LOD. In order to gurantee that also older drivers, where attribute is not
2523	!-- given, are working, do not abort the run but assume LOD2 forcing.
2524	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_pt, .FALSE., 'ls_forcing_left_pt', .FALSE. )
2525	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_qv, .FALSE., 'ls_forcing_left_qv', .FALSE. )
2526	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_u, .FALSE., 'ls_forcing_left_u', .FALSE. )
2527	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_v, .FALSE., 'ls_forcing_left_v', .FALSE. )
2528	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_w, .FALSE., 'ls_forcing_left_w', .FALSE. )
2529
2530	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_pt, .FALSE., 'ls_forcing_north_pt', .FALSE. )
2531	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_qv, .FALSE., 'ls_forcing_north_qv', .FALSE. )
2532	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_u, .FALSE., 'ls_forcing_north_u', .FALSE. )
2533	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_v, .FALSE., 'ls_forcing_north_v', .FALSE. )
2534	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_w, .FALSE., 'ls_forcing_north_w', .FALSE. )
2535
2536	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_pt, .FALSE., 'ls_forcing_south_pt', .FALSE. )
2537	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_qv, .FALSE., 'ls_forcing_south_qv', .FALSE. )
2538	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_u, .FALSE., 'ls_forcing_south_u', .FALSE. )
2539	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_v, .FALSE., 'ls_forcing_south_v', .FALSE. )
2540	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_w, .FALSE., 'ls_forcing_south_w', .FALSE. )
2541
2542	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_pt, .FALSE., 'ls_forcing_right_pt', .FALSE. )
2543	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_qv, .FALSE., 'ls_forcing_right_qv', .FALSE. )
2544	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_u, .FALSE., 'ls_forcing_right_u', .FALSE. )
2545	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_v, .FALSE., 'ls_forcing_right_v', .FALSE. )
2546	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_w, .FALSE., 'ls_forcing_right_w', .FALSE. )
2547
2548	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_pt, .FALSE., 'ls_forcing_top_pt', .FALSE. )
2549	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_qv, .FALSE., 'ls_forcing_top_qv', .FALSE. )
2550	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_u, .FALSE., 'ls_forcing_top_u', .FALSE. )
2551	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_v, .FALSE., 'ls_forcing_top_v', .FALSE. )
2552	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_w, .FALSE., 'ls_forcing_top_w', .FALSE. )
2553
2554	CALL close_input_file( pids_id )
2555	#endif
2556	!
2557	!-- Temporary workaround until most of the dynamic drivers contain a LOD attribute. So far INIFOR
2558	!-- did not provide the LOD attribute. In order to still use these older dynamic drivers, provide a
2559	!-- temporary workaround. If the LOD is not given, a NetCDF interal error will occur but the
2560	!-- simulation will not be aborted since the no_abort flag is passed. However, the respective
2561	!-- attribute value might be given an arbitrary number. Hence, check for valid LOD's and manually
2562	!-- set them to LOD 2 (as assumed so far). Note, this workaround should be removed later (date of
2563	!-- reference: 6. Oct. 2020).
2564	IF ( nest_offl%lod_east_pt /= 1 .AND. nest_offl%lod_east_pt /= 2 ) nest_offl%lod_east_pt = 2
2565	IF ( nest_offl%lod_east_qv /= 1 .AND. nest_offl%lod_east_qv /= 2 ) nest_offl%lod_east_qv = 2
2566	IF ( nest_offl%lod_east_u /= 1 .AND. nest_offl%lod_east_u /= 2 ) nest_offl%lod_east_u = 2
2567	IF ( nest_offl%lod_east_v /= 1 .AND. nest_offl%lod_east_v /= 2 ) nest_offl%lod_east_v = 2
2568	IF ( nest_offl%lod_east_w /= 1 .AND. nest_offl%lod_east_w /= 2 ) nest_offl%lod_east_w = 2
2569
2570	IF ( nest_offl%lod_north_pt /= 1 .AND. nest_offl%lod_north_pt /= 2 ) nest_offl%lod_north_pt = 2
2571	IF ( nest_offl%lod_north_qv /= 1 .AND. nest_offl%lod_north_qv /= 2 ) nest_offl%lod_north_qv = 2
2572	IF ( nest_offl%lod_north_u /= 1 .AND. nest_offl%lod_north_u /= 2 ) nest_offl%lod_north_u = 2
2573	IF ( nest_offl%lod_north_v /= 1 .AND. nest_offl%lod_north_v /= 2 ) nest_offl%lod_north_v = 2
2574	IF ( nest_offl%lod_north_w /= 1 .AND. nest_offl%lod_north_w /= 2 ) nest_offl%lod_north_w = 2
2575
2576	IF ( nest_offl%lod_south_pt /= 1 .AND. nest_offl%lod_south_pt /= 2 ) nest_offl%lod_south_pt = 2
2577	IF ( nest_offl%lod_south_qv /= 1 .AND. nest_offl%lod_south_qv /= 2 ) nest_offl%lod_south_qv = 2
2578	IF ( nest_offl%lod_south_u /= 1 .AND. nest_offl%lod_south_u /= 2 ) nest_offl%lod_south_u = 2
2579	IF ( nest_offl%lod_south_v /= 1 .AND. nest_offl%lod_south_v /= 2 ) nest_offl%lod_south_v = 2
2580	IF ( nest_offl%lod_south_w /= 1 .AND. nest_offl%lod_south_w /= 2 ) nest_offl%lod_south_w = 2
2581
2582	IF ( nest_offl%lod_west_pt /= 1 .AND. nest_offl%lod_west_pt /= 2 ) nest_offl%lod_west_pt = 2
2583	IF ( nest_offl%lod_west_qv /= 1 .AND. nest_offl%lod_west_qv /= 2 ) nest_offl%lod_west_qv = 2
2584	IF ( nest_offl%lod_west_u /= 1 .AND. nest_offl%lod_west_u /= 2 ) nest_offl%lod_west_u = 2
2585	IF ( nest_offl%lod_west_v /= 1 .AND. nest_offl%lod_west_v /= 2 ) nest_offl%lod_west_v = 2
2586	IF ( nest_offl%lod_west_w /= 1 .AND. nest_offl%lod_west_w /= 2 ) nest_offl%lod_west_w = 2
2587
2588	IF ( nest_offl%lod_top_pt /= 1 .AND. nest_offl%lod_top_pt /= 2 ) nest_offl%lod_top_pt = 2
2589	IF ( nest_offl%lod_top_qv /= 1 .AND. nest_offl%lod_top_qv /= 2 ) nest_offl%lod_top_qv = 2
2590	IF ( nest_offl%lod_top_u /= 1 .AND. nest_offl%lod_top_u /= 2 ) nest_offl%lod_top_u = 2
2591	IF ( nest_offl%lod_top_v /= 1 .AND. nest_offl%lod_top_v /= 2 ) nest_offl%lod_top_v = 2
2592	IF ( nest_offl%lod_top_w /= 1 .AND. nest_offl%lod_top_w /= 2 ) nest_offl%lod_top_w = 2
2593	!
2594	!-- For consistency, check if all boundary input variables have the same LOD.
2595	IF ( MAX( nest_offl%lod_east_pt, nest_offl%lod_east_qv, nest_offl%lod_east_u, &
2596	nest_offl%lod_east_v, nest_offl%lod_east_w, &
2597	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2598	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2599	nest_offl%lod_south_pt, nest_offl%lod_south_qv, nest_offl%lod_south_u, &
2600	nest_offl%lod_south_v, nest_offl%lod_south_w, &
2601	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2602	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2603	nest_offl%lod_top_pt, nest_offl%lod_top_qv, nest_offl%lod_top_u, &
2604	nest_offl%lod_top_v, nest_offl%lod_top_w ) &
2605	/= &
2606	MIN( nest_offl%lod_east_pt, nest_offl%lod_east_qv, nest_offl%lod_east_u, &
2607	nest_offl%lod_east_v, nest_offl%lod_east_w, &
2608	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2609	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2610	nest_offl%lod_south_pt, nest_offl%lod_south_qv, nest_offl%lod_south_u, &
2611	nest_offl%lod_south_v, nest_offl%lod_south_w, &
2612	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2613	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2614	nest_offl%lod_top_pt, nest_offl%lod_top_qv, nest_offl%lod_top_u, &
2615	nest_offl%lod_top_v, nest_offl%lod_top_w ) ) THEN
2616	message_string = 'A mixture of different LOD for the provided boundary data is not ' // &
2617	'possible.'
2618	CALL message( 'nesting_offl_init', 'PA0504', 1, 2, 0, 6, 0 )
2619	ENDIF
2620	!
2621	!-- As all LODs are the same, store it.
2622	lod = nest_offl%lod_east_u
2623	!
2624	!-- Allocate arrays for geostrophic wind components. Arrays will incorporate 2 time levels in order
2625	!-- to interpolate in between.
2626	ALLOCATE( nest_offl%ug(0:1,1:nzt) )
2627	ALLOCATE( nest_offl%vg(0:1,1:nzt) )
2628	!
2629	!-- Set index range according to the given LOD in order to allocate the input arrays.
2630	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2631	IF ( lod == 2 ) THEN
2632	j_start = nys
2633	j_start_v = nysv
2634	j_end = nyn
2635	ELSE
2636	j_start = 1
2637	j_start_v = 1
2638	j_end = 1
2639	ENDIF
2640	ENDIF
2641
2642	IF ( bc_dirichlet_n .OR. bc_dirichlet_s ) THEN
2643	IF( lod == 2 ) THEN
2644	i_start = nxl
2645	i_start_u = nxlu
2646	i_end = nxr
2647	ELSE
2648	i_start = 1
2649	i_start_u = 1
2650	i_end = 1
2651	ENDIF
2652	ENDIF
2653	!
2654	!-- Allocate arrays for reading left/right boundary values. Arrays will incorporate 2 time levels in
2655	!-- order to interpolate in between. Depending on the given LOD, the x-, or y-dimension will be
2656	!-- either nxl:nxr, or nys:nyn (for LOD=2), or it reduces to one element for LOD=1. If the core has
2657	!-- no lateral boundary, allocate a dummy array as well, in order to enable netcdf parallel access.
2658	!-- Dummy arrays will be allocated with dimension length zero.
2659	IF ( bc_dirichlet_l ) THEN
2660	ALLOCATE( nest_offl%u_l(0:1,nzb+1:nzt,j_start:j_end) )
2661	ALLOCATE( nest_offl%v_l(0:1,nzb+1:nzt,j_start_v:j_end) )
2662	ALLOCATE( nest_offl%w_l(0:1,nzb+1:nzt-1,j_start:j_end) )
2663	IF ( humidity ) ALLOCATE( nest_offl%q_l(0:1,nzb+1:nzt,j_start:j_end) )
2664	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_l(0:1,nzb+1:nzt,j_start:j_end) )
2665	IF ( air_chemistry .AND. nesting_offline_chem ) &
2666	ALLOCATE( nest_offl%chem_l(0:1,nzb+1:nzt,j_start:j_end,1:UBOUND( chem_species, 1 )) )
2667	ELSE
2668	ALLOCATE( nest_offl%u_l(1:1,1:1,1:1) )
2669	ALLOCATE( nest_offl%v_l(1:1,1:1,1:1) )
2670	ALLOCATE( nest_offl%w_l(1:1,1:1,1:1) )
2671	IF ( humidity ) ALLOCATE( nest_offl%q_l(1:1,1:1,1:1) )
2672	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_l(1:1,1:1,1:1) )
2673	IF ( air_chemistry .AND. nesting_offline_chem ) &
2674	ALLOCATE( nest_offl%chem_l(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2675	ENDIF
2676	IF ( bc_dirichlet_r ) THEN
2677	ALLOCATE( nest_offl%u_r(0:1,nzb+1:nzt,j_start:j_end) )
2678	ALLOCATE( nest_offl%v_r(0:1,nzb+1:nzt,j_start_v:j_end) )
2679	ALLOCATE( nest_offl%w_r(0:1,nzb+1:nzt-1,j_start:j_end) )
2680	IF ( humidity ) ALLOCATE( nest_offl%q_r(0:1,nzb+1:nzt,j_start:j_end) )
2681	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_r(0:1,nzb+1:nzt,j_start:j_end) )
2682	IF ( air_chemistry .AND. nesting_offline_chem ) &
2683	ALLOCATE( nest_offl%chem_r(0:1,nzb+1:nzt,j_start:j_end,1:UBOUND( chem_species, 1 )) )
2684	ELSE
2685	ALLOCATE( nest_offl%u_r(1:1,1:1,1:1) )
2686	ALLOCATE( nest_offl%v_r(1:1,1:1,1:1) )
2687	ALLOCATE( nest_offl%w_r(1:1,1:1,1:1) )
2688	IF ( humidity ) ALLOCATE( nest_offl%q_r(1:1,1:1,1:1) )
2689	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_r(1:1,1:1,1:1) )
2690	IF ( air_chemistry .AND. nesting_offline_chem ) &
2691	ALLOCATE( nest_offl%chem_r(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2692	ENDIF
2693	!
2694	!-- Allocate arrays for reading north/south boundary values. Arrays will incorporate 2 time levels
2695	!-- in order to interpolate in between. If the core has no boundary, allocate a dummy array, in
2696	!-- order to enable netcdf parallel access. Dummy arrays will be allocated with dimension length
2697	!-- zero.
2698	IF ( bc_dirichlet_n ) THEN
2699	ALLOCATE( nest_offl%u_n(0:1,nzb+1:nzt,i_start_u:i_end) )
2700	ALLOCATE( nest_offl%v_n(0:1,nzb+1:nzt,i_start:i_end) )
2701	ALLOCATE( nest_offl%w_n(0:1,nzb+1:nzt-1,i_start:i_end) )
2702	IF ( humidity ) ALLOCATE( nest_offl%q_n(0:1,nzb+1:nzt,i_start:i_end) )
2703	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_n(0:1,nzb+1:nzt,i_start:i_end) )
2704	IF ( air_chemistry .AND. nesting_offline_chem ) &
2705	ALLOCATE( nest_offl%chem_n(0:1,nzb+1:nzt,i_start:i_end,1:UBOUND( chem_species, 1 )) )
2706	ELSE
2707	ALLOCATE( nest_offl%u_n(1:1,1:1,1:1) )
2708	ALLOCATE( nest_offl%v_n(1:1,1:1,1:1) )
2709	ALLOCATE( nest_offl%w_n(1:1,1:1,1:1) )
2710	IF ( humidity ) ALLOCATE( nest_offl%q_n(1:1,1:1,1:1) )
2711	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_n(1:1,1:1,1:1) )
2712	IF ( air_chemistry .AND. nesting_offline_chem ) &
2713	ALLOCATE( nest_offl%chem_n(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2714	ENDIF
2715	IF ( bc_dirichlet_s ) THEN
2716	ALLOCATE( nest_offl%u_s(0:1,nzb+1:nzt,i_start_u:i_end) )
2717	ALLOCATE( nest_offl%v_s(0:1,nzb+1:nzt,i_start:i_end) )
2718	ALLOCATE( nest_offl%w_s(0:1,nzb+1:nzt-1,i_start:i_end) )
2719	IF ( humidity ) ALLOCATE( nest_offl%q_s(0:1,nzb+1:nzt,i_start:i_end) )
2720	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_s(0:1,nzb+1:nzt,i_start:i_end) )
2721	IF ( air_chemistry .AND. nesting_offline_chem ) &
2722	ALLOCATE( nest_offl%chem_s(0:1,nzb+1:nzt,i_start:i_end,1:UBOUND( chem_species, 1 )) )
2723	ELSE
2724	ALLOCATE( nest_offl%u_s(1:1,1:1,1:1) )
2725	ALLOCATE( nest_offl%v_s(1:1,1:1,1:1) )
2726	ALLOCATE( nest_offl%w_s(1:1,1:1,1:1) )
2727	IF ( humidity ) ALLOCATE( nest_offl%q_s(1:1,1:1,1:1) )
2728	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_s(1:1,1:1,1:1) )
2729	IF ( air_chemistry .AND. nesting_offline_chem ) &
2730	ALLOCATE( nest_offl%chem_s(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2731	ENDIF
2732	!
2733	!-- Allocate arrays for reading data at the top boundary. In contrast to the lateral boundaries,
2734	!-- each core reads these data so that no dummy arrays need to be allocated.
2735	IF ( lod == 2 ) THEN
2736	ALLOCATE( nest_offl%u_top(0:1,nys:nyn,nxlu:nxr) )
2737	ALLOCATE( nest_offl%v_top(0:1,nysv:nyn,nxl:nxr) )
2738	ALLOCATE( nest_offl%w_top(0:1,nys:nyn,nxl:nxr) )
2739	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,nys:nyn,nxl:nxr) )
2740	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,nys:nyn,nxl:nxr) )
2741	IF ( air_chemistry .AND. nesting_offline_chem ) &
2742	ALLOCATE( nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,1:UBOUND( chem_species, 1 )) )
2743	ELSE
2744	ALLOCATE( nest_offl%u_top(0:1,1:1,1:1) )
2745	ALLOCATE( nest_offl%v_top(0:1,1:1,1:1) )
2746	ALLOCATE( nest_offl%w_top(0:1,1:1,1:1) )
2747	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,1:1,1:1) )
2748	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,1:1,1:1) )
2749	IF ( air_chemistry .AND. nesting_offline_chem ) &
2750	ALLOCATE( nest_offl%chem_top(0:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2751	ENDIF
2752	!
2753	!-- For chemical species, create the names of the variables. This is necessary to identify the
2754	!-- respective variable and write it onto the correct array in the chem_species datatype.
2755	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2756	ALLOCATE( nest_offl%chem_from_file_l(1:UBOUND( chem_species, 1 )) )
2757	ALLOCATE( nest_offl%chem_from_file_n(1:UBOUND( chem_species, 1 )) )
2758	ALLOCATE( nest_offl%chem_from_file_r(1:UBOUND( chem_species, 1 )) )
2759	ALLOCATE( nest_offl%chem_from_file_s(1:UBOUND( chem_species, 1 )) )
2760	ALLOCATE( nest_offl%chem_from_file_t(1:UBOUND( chem_species, 1 )) )
2761
2762	ALLOCATE( nest_offl%var_names_chem_l(1:UBOUND( chem_species, 1 )) )
2763	ALLOCATE( nest_offl%var_names_chem_n(1:UBOUND( chem_species, 1 )) )
2764	ALLOCATE( nest_offl%var_names_chem_r(1:UBOUND( chem_species, 1 )) )
2765	ALLOCATE( nest_offl%var_names_chem_s(1:UBOUND( chem_species, 1 )) )
2766	ALLOCATE( nest_offl%var_names_chem_t(1:UBOUND( chem_species, 1 )) )
2767	!
2768	!-- Initialize flags that indicate whether the variable is on file or not. Please note, this is
2769	!-- only necessary for chemistry variables.
2770	nest_offl%chem_from_file_l(:) = .FALSE.
2771	nest_offl%chem_from_file_n(:) = .FALSE.
2772	nest_offl%chem_from_file_r(:) = .FALSE.
2773	nest_offl%chem_from_file_s(:) = .FALSE.
2774	nest_offl%chem_from_file_t(:) = .FALSE.
2775
2776	DO n = 1, UBOUND( chem_species, 1 )
2777	nest_offl%var_names_chem_l(n) = nest_offl%char_l // TRIM(chem_species(n)%name)
2778	nest_offl%var_names_chem_n(n) = nest_offl%char_n // TRIM(chem_species(n)%name)
2779	nest_offl%var_names_chem_r(n) = nest_offl%char_r // TRIM(chem_species(n)%name)
2780	nest_offl%var_names_chem_s(n) = nest_offl%char_s // TRIM(chem_species(n)%name)
2781	nest_offl%var_names_chem_t(n) = nest_offl%char_t // TRIM(chem_species(n)%name)
2782	ENDDO
2783	ENDIF
2784	!
2785	!-- Offline nesting for salsa
2786	IF ( salsa ) CALL salsa_nesting_offl_init
2787	!
2788	!-- Before initial data input is initiated, check if dynamic input file is present.
2789	IF ( .NOT. input_pids_dynamic ) THEN
2790	message_string = 'nesting_offline = .TRUE. requires dynamic ' // &
2791	'input file ' // TRIM( input_file_dynamic ) // TRIM( coupling_char )
2792	CALL message( 'nesting_offl_init', 'PA0546', 1, 2, 0, 6, 0 )
2793	ENDIF
2794	!
2795	!-- Read COSMO data at lateral and top boundaries
2796	CALL nesting_offl_input
2797	!
2798	!-- Check if sufficient time steps are provided to cover the entire simulation. Note, dynamic input
2799	!-- is only required for the 3D simulation, not for the soil/wall spinup. However, as the spinup
2800	!-- time is added to the end_time, this must be considered here.
2801	IF ( end_time - spinup_time > nest_offl%time(nest_offl%nt-1) ) THEN
2802	message_string = 'end_time of the simulation exceeds the ' // &
2803	'time dimension in the dynamic input file.'
2804	CALL message( 'nesting_offl_init', 'PA0183', 1, 2, 0, 6, 0 )
2805	ENDIF
2806	!
2807	!-- Set indicies for boundary grid points
2808	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2809	i_bound = MERGE( nxl - 1, nxr + 1, bc_dirichlet_l )
2810	i_bound_u = MERGE( nxlu - 1, nxr + 1, bc_dirichlet_l )
2811	ENDIF
2812	IF ( bc_dirichlet_n .OR. bc_dirichlet_s ) THEN
2813	j_bound = MERGE( nys - 1, nyn + 1, bc_dirichlet_s )
2814	j_bound_v = MERGE( nysv - 1, nyn + 1, bc_dirichlet_s )
2815	ENDIF
2816	!
2817	!-- Initialize boundary data. Please note, do not initialize boundaries in case of restart runs.
2818	!-- This case the boundaries are already initialized and the boundary data from file would be on the
2819	!-- wrong time level.
2820	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
2821	!
2822	!-- Distinguish between LOD = 1 and LOD = 2 inititialization
2823	IF ( lod == 2 ) THEN
2824	IF ( bc_dirichlet_l ) THEN
2825	u(nzb+1:nzt,nys:nyn,i_bound_u) = nest_offl%u_l(0,nzb+1:nzt,nys:nyn)
2826	v(nzb+1:nzt,nysv:nyn,i_bound) = nest_offl%v_l(0,nzb+1:nzt,nysv:nyn)
2827	w(nzb+1:nzt-1,nys:nyn,i_bound) = nest_offl%w_l(0,nzb+1:nzt-1,nys:nyn)
2828	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%pt_l(0,nzb+1:nzt,nys:nyn)
2829	IF ( humidity ) q(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%q_l(0,nzb+1:nzt,nys:nyn)
2830	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2831	DO n = 1, UBOUND( chem_species, 1 )
2832	IF( nest_offl%chem_from_file_l(n) ) THEN
2833	chem_species(n)%conc(nzb+1:nzt,nys:nyn,i_bound) = &
2834	nest_offl%chem_l(0,nzb+1:nzt,nys:nyn,n)
2835	ENDIF
2836	ENDDO
2837	ENDIF
2838	ENDIF
2839	IF ( bc_dirichlet_r ) THEN
2840	u(nzb+1:nzt,nys:nyn,i_bound_u) = nest_offl%u_r(0,nzb+1:nzt,nys:nyn)
2841	v(nzb+1:nzt,nysv:nyn,i_bound) = nest_offl%v_r(0,nzb+1:nzt,nysv:nyn)
2842	w(nzb+1:nzt-1,nys:nyn,i_bound) = nest_offl%w_r(0,nzb+1:nzt-1,nys:nyn)
2843	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%pt_r(0,nzb+1:nzt,nys:nyn)
2844	IF ( humidity ) q(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%q_r(0,nzb+1:nzt,nys:nyn)
2845	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2846	DO n = 1, UBOUND( chem_species, 1 )
2847	IF( nest_offl%chem_from_file_r(n) ) THEN
2848	chem_species(n)%conc(nzb+1:nzt,nys:nyn,i_bound) = &
2849	nest_offl%chem_r(0,nzb+1:nzt,nys:nyn,n)
2850	ENDIF
2851	ENDDO
2852	ENDIF
2853	ENDIF
2854
2855	IF ( bc_dirichlet_n) THEN
2856	u(nzb+1:nzt,j_bound,nxlu:nxr) = nest_offl%u_n(0,nzb+1:nzt,nxlu:nxr)
2857	v(nzb+1:nzt,j_bound_v,nxl:nxr) = nest_offl%v_n(0,nzb+1:nzt,nxl:nxr)
2858	w(nzb+1:nzt-1,j_bound,nxl:nxr) = nest_offl%w_n(0,nzb+1:nzt-1,nxl:nxr)
2859	IF ( .NOT. neutral ) pt(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%pt_n(0,nzb+1:nzt,nxl:nxr)
2860	IF ( humidity ) q(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%q_n(0,nzb+1:nzt,nxl:nxr)
2861	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2862	DO n = 1, UBOUND( chem_species, 1 )
2863	IF( nest_offl%chem_from_file_n(n) ) THEN
2864	chem_species(n)%conc(nzb+1:nzt,j_bound,nxl:nxr) = &
2865	nest_offl%chem_n(0,nzb+1:nzt,nxl:nxr,n)
2866	ENDIF
2867	ENDDO
2868	ENDIF
2869	ENDIF
2870	IF ( bc_dirichlet_s) THEN
2871	u(nzb+1:nzt,j_bound,nxlu:nxr) = nest_offl%u_s(0,nzb+1:nzt,nxlu:nxr)
2872	v(nzb+1:nzt,j_bound_v,nxl:nxr) = nest_offl%v_s(0,nzb+1:nzt,nxl:nxr)
2873	w(nzb+1:nzt-1,j_bound,nxl:nxr) = nest_offl%w_s(0,nzb+1:nzt-1,nxl:nxr)
2874	IF ( .NOT. neutral ) pt(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%pt_s(0,nzb+1:nzt,nxl:nxr)
2875	IF ( humidity ) q(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%q_s(0,nzb+1:nzt,nxl:nxr)
2876	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2877	DO n = 1, UBOUND( chem_species, 1 )
2878	IF( nest_offl%chem_from_file_s(n) ) THEN
2879	chem_species(n)%conc(nzb+1:nzt,j_bound,nxl:nxr) = &
2880	nest_offl%chem_s(0,nzb+1:nzt,nxl:nxr,n)
2881	ENDIF
2882	ENDDO
2883	ENDIF
2884	ENDIF
2885
2886	u(nzt+1,nys:nyn,nxlu:nxr) = nest_offl%u_top(0,nys:nyn,nxlu:nxr)
2887	v(nzt+1,nysv:nyn,nxl:nxr) = nest_offl%v_top(0,nysv:nyn,nxl:nxr)
2888	w(nzt,nys:nyn,nxl:nxr) = nest_offl%w_top(0,nys:nyn,nxl:nxr)
2889	w(nzt+1,nys:nyn,nxl:nxr) = nest_offl%w_top(0,nys:nyn,nxl:nxr)
2890	IF ( .NOT. neutral ) pt(nzt+1,nys:nyn,nxl:nxr) = nest_offl%pt_top(0,nys:nyn,nxl:nxr)
2891	IF ( humidity ) q(nzt+1,nys:nyn,nxl:nxr) = nest_offl%q_top(0,nys:nyn,nxl:nxr)
2892	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2893	DO n = 1, UBOUND( chem_species, 1 )
2894	IF( nest_offl%chem_from_file_t(n) ) THEN
2895	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = &
2896	nest_offl%chem_top(0,nys:nyn,nxl:nxr,n)
2897	ENDIF
2898	ENDDO
2899	ENDIF
2900	!
2901	!-- LOD 1
2902	ELSE
2903	IF ( bc_dirichlet_l ) THEN
2904	DO j = nys, nyn
2905	u(nzb+1:nzt,j,i_bound_u) = nest_offl%u_l(0,nzb+1:nzt,1)
2906	w(nzb+1:nzt-1,j,i_bound) = nest_offl%w_l(0,nzb+1:nzt-1,1)
2907	ENDDO
2908	DO j = nysv, nyn
2909	v(nzb+1:nzt,j,i_bound) = nest_offl%v_l(0,nzb+1:nzt,1)
2910	ENDDO
2911	IF ( .NOT. neutral ) THEN
2912	DO j = nys, nyn
2913	pt(nzb+1:nzt,j,i_bound) = nest_offl%pt_l(0,nzb+1:nzt,1)
2914	ENDDO
2915	ENDIF
2916	IF ( humidity ) THEN
2917	DO j = nys, nyn
2918	q(nzb+1:nzt,j,i_bound) = nest_offl%q_l(0,nzb+1:nzt,1)
2919	ENDDO
2920	ENDIF
2921	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2922	DO n = 1, UBOUND( chem_species, 1 )
2923	IF( nest_offl%chem_from_file_l(n) ) THEN
2924	DO j = nys, nyn
2925	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = &
2926	nest_offl%chem_l(0,nzb+1:nzt,1,n)
2927	ENDDO
2928	ENDIF
2929	ENDDO
2930	ENDIF
2931	ENDIF
2932	IF ( bc_dirichlet_r ) THEN
2933	DO j = nys, nyn
2934	u(nzb+1:nzt,j,i_bound_u) = nest_offl%u_r(0,nzb+1:nzt,1)
2935	w(nzb+1:nzt-1,j,i_bound) = nest_offl%w_r(0,nzb+1:nzt-1,1)
2936	ENDDO
2937	DO j = nysv, nyn
2938	v(nzb+1:nzt,j,i_bound) = nest_offl%v_r(0,nzb+1:nzt,1)
2939	ENDDO
2940	IF ( .NOT. neutral ) THEN
2941	DO j = nys, nyn
2942	pt(nzb+1:nzt,j,i_bound) = nest_offl%pt_r(0,nzb+1:nzt,1)
2943	ENDDO
2944	ENDIF
2945	IF ( humidity ) THEN
2946	DO j = nys, nyn
2947	q(nzb+1:nzt,j,i_bound) = nest_offl%q_r(0,nzb+1:nzt,1)
2948	ENDDO
2949	ENDIF
2950	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2951	DO n = 1, UBOUND( chem_species, 1 )
2952	IF( nest_offl%chem_from_file_r(n) ) THEN
2953	DO j = nys, nyn
2954	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = &
2955	nest_offl%chem_r(0,nzb+1:nzt,1,n)
2956	ENDDO
2957	ENDIF
2958	ENDDO
2959	ENDIF
2960	ENDIF
2961	IF ( bc_dirichlet_n ) THEN
2962	DO i = nxlu, nxr
2963	u(nzb+1:nzt,j_bound,i) = nest_offl%u_n(0,nzb+1:nzt,1)
2964	ENDDO
2965	DO i = nxl, nxr
2966	v(nzb+1:nzt,j_bound_v,i) = nest_offl%v_n(0,nzb+1:nzt,1)
2967	w(nzb+1:nzt-1,j_bound,i) = nest_offl%w_n(0,nzb+1:nzt-1,1)
2968	ENDDO
2969	IF ( .NOT. neutral ) THEN
2970	DO i = nxl, nxr
2971	pt(nzb+1:nzt,j_bound,i) = nest_offl%pt_n(0,nzb+1:nzt,1)
2972	ENDDO
2973	ENDIF
2974	IF ( humidity ) THEN
2975	DO i = nxl, nxr
2976	q(nzb+1:nzt,j_bound,i) = nest_offl%q_n(0,nzb+1:nzt,1)
2977	ENDDO
2978	ENDIF
2979	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2980	DO n = 1, UBOUND( chem_species, 1 )
2981	IF( nest_offl%chem_from_file_n(n) ) THEN
2982	DO i = nxl, nxr
2983	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = &
2984	nest_offl%chem_n(0,nzb+1:nzt,1,n)
2985	ENDDO
2986	ENDIF
2987	ENDDO
2988	ENDIF
2989	ENDIF
2990	IF ( bc_dirichlet_s ) THEN
2991	DO i = nxlu, nxr
2992	u(nzb+1:nzt,j_bound,i) = nest_offl%u_s(0,nzb+1:nzt,1)
2993	ENDDO
2994	DO i = nxl, nxr
2995	v(nzb+1:nzt,j_bound_v,i) = nest_offl%v_s(0,nzb+1:nzt,1)
2996	w(nzb+1:nzt-1,j_bound,i) = nest_offl%w_s(0,nzb+1:nzt-1,1)
2997	ENDDO
2998	IF ( .NOT. neutral ) THEN
2999	DO i = nxl, nxr
3000	pt(nzb+1:nzt,j_bound,i) = nest_offl%pt_s(0,nzb+1:nzt,1)
3001	ENDDO
3002	ENDIF
3003	IF ( humidity ) THEN
3004	DO i = nxl, nxr
3005	q(nzb+1:nzt,j_bound,i) = nest_offl%q_s(0,nzb+1:nzt,1)
3006	ENDDO
3007	ENDIF
3008	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3009	DO n = 1, UBOUND( chem_species, 1 )
3010	IF( nest_offl%chem_from_file_s(n) ) THEN
3011	DO i = nxl, nxr
3012	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = &
3013	nest_offl%chem_s(0,nzb+1:nzt,1,n)
3014	ENDDO
3015	ENDIF
3016	ENDDO
3017	ENDIF
3018	ENDIF
3019
3020	u(nzt+1,nys:nyn,nxlu:nxr) = nest_offl%u_top(0,1,1)
3021	v(nzt+1,nysv:nyn,nxl:nxr) = nest_offl%v_top(0,1,1)
3022	w(nzt,nys:nyn,nxl:nxr) = nest_offl%w_top(0,1,1)
3023	w(nzt+1,nys:nyn,nxl:nxr) = nest_offl%w_top(0,1,1)
3024	IF ( .NOT. neutral ) pt(nzt+1,nys:nyn,nxl:nxr) = nest_offl%pt_top(0,1,1)
3025	IF ( humidity ) q(nzt+1,nys:nyn,nxl:nxr) = nest_offl%q_top(0,1,1)
3026	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3027	DO n = 1, UBOUND( chem_species, 1 )
3028	IF( nest_offl%chem_from_file_t(n) ) THEN
3029	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = nest_offl%chem_top(0,1,1,n)
3030	ENDIF
3031	ENDDO
3032	ENDIF
3033	ENDIF
3034	!
3035	!-- In case of offline nesting the pressure forms itself based on the prescribed lateral
3036	!-- boundary conditions. Hence, explicit forcing by pressure gradients via geostrophic wind
3037	!-- components is not necessary and would be canceled out by the perturbation pressure otherwise.
3038	!-- For this reason, set geostrophic wind components to zero.
3039	ug(nzb+1:nzt) = 0.0_wp
3040	vg(nzb+1:nzt) = 0.0_wp
3041
3042	ENDIF
3043	!
3044	!-- After boundary data is initialized, mask topography at the boundaries for the velocity
3045	!-- components.
3046	u = MERGE( u, 0.0_wp, BTEST( wall_flags_total_0, 1 ) )
3047	v = MERGE( v, 0.0_wp, BTEST( wall_flags_total_0, 2 ) )
3048	w = MERGE( w, 0.0_wp, BTEST( wall_flags_total_0, 3 ) )
3049	!
3050	!-- Initial calculation of the boundary layer depth from the prescribed boundary data. This is
3051	!-- required for initialize the synthetic turbulence generator correctly.
3052	CALL nesting_offl_calc_zi
3053	!
3054	!-- After boundary data is initialized, ensure mass conservation. Not necessary in restart runs.
3055	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
3056	CALL nesting_offl_mass_conservation
3057	ENDIF
3058
3059	END SUBROUTINE nesting_offl_init
3060
3061	!--------------------------------------------------------------------------------------------------!
3062	! Description:
3063	!--------------------------------------------------------------------------------------------------!
3064	!> Interpolation function, used to interpolate boundary data in time.
3065	!--------------------------------------------------------------------------------------------------!
3066	FUNCTION interpolate_in_time( var_t1, var_t2, fac )
3067
3068	REAL(wp) :: fac !< interpolation factor
3069	REAL(wp) :: interpolate_in_time !< time-interpolated boundary value
3070	REAL(wp) :: var_t1 !< boundary value at t1
3071	REAL(wp) :: var_t2 !< boundary value at t2
3072
3073	interpolate_in_time = ( 1.0_wp - fac ) * var_t1 + fac * var_t2
3074
3075	END FUNCTION interpolate_in_time
3076
3077
3078
3079	END MODULE nesting_offl_mod

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