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source: palm/trunk/SOURCE/nesting_offl_mod.f90 @ 4810

Last change on this file since 4810 was 4795, checked in by suehring, 4 years ago
mesoscale nesting: bugfix in obtaining the correct timestamp in case of restart runs; virtual measurements: add missing control flags
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File size: 177.9 KB

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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
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: nesting_offl_mod.f90 4795 2020-11-25 15:55:14Z gronemeier $
27	! Bugfix in obtaining the correct timestamp in case of restart runs
28	!
29	! 4724 2020-10-06 17:20:39Z suehring
30	! - Enable LOD=1 input of boundary conditions
31	! - Minor bugfix - add missing initialization of the top boundary
32	!
33	! 4582 2020-06-29 09:22:11Z suehring
34	! Remove unused variable
35	!
36	! 4581 2020-06-29 08:49:58Z suehring
37	! Omit explicit pressure forcing via geostrophic wind components in case of
38	! mesoscale nesting.
39	!
40	! 4561 2020-06-12 07:05:56Z suehring
41	! Adapt mass-flux correction also for the anelastic approximation
42	!
43	! 4561 2020-06-12 07:05:56Z suehring
44	! use statement for exchange horiz added
45	!
46	! 4360 2020-01-07 11:25:50Z suehring
47	! Bugfix, time coordinate is relative to origin_time rather than to 00:00:00
48	! 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
52	! topography 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
91	! lateral boundary data on cores that actually do not belong to these
92	! boundaries.
93	!
94	! 4079 2019-07-09 18:04:41Z suehring
95	! - Set boundary condition for w at nzt+1 at the lateral boundaries, even
96	! though these won't enter the numerical solution. However, due to the mass
97	! conservation these values might some up to very large values which will
98	! occur in the run-control file
99	! - Bugfix in offline nesting of chemical species
100	! - Do not set Neumann conditions for TKE and passive scalar
101	!
102	! 4022 2019-06-12 11:52:39Z suehring
103	! Detection of boundary-layer depth in stable boundary layer on basis of
104	! boundary data improved
105	! Routine for boundary-layer depth calculation renamed and made public
106	!
107	! 3987 2019-05-22 09:52:13Z kanani
108	! Introduce alternative switch for debug output during timestepping
109	!
110	! 3964 2019-05-09 09:48:32Z suehring
111	! Ensure that veloctiy term in calculation of bulk Richardson number does not
112	! become zero
113	!
114	! 3937 2019-04-29 15:09:07Z suehring
115	! Set boundary conditon on upper-left and upper-south grid point for the u- and
116	! v-component, respectively.
117	!
118	! 3891 2019-04-12 17:52:01Z suehring
119	! Bugfix, do not overwrite lateral and top boundary data in case of restart
120	! runs.
121	!
122	! 3885 2019-04-11 11:29:34Z kanani
123	! Changes related to global restructuring of location messages and introduction
124	! of additional debug messages
125	!
126	!
127	! Do local data exchange for chemistry variables only when boundary data is
128	! coming from dynamic file
129	!
130	! 3737 2019-02-12 16:57:06Z suehring
131	! Introduce mesoscale nesting for chemical species
132	!
133	! 3705 2019-01-29 19:56:39Z suehring
134	! Formatting adjustments
135	!
136	! 3704 2019-01-29 19:51:41Z suehring
137	! Check implemented for offline nesting in child domain
138	!
139	! Initial Revision:
140	! - separate offline nesting from large_scale_nudging_mod
141	! - revise offline nesting, adjust for usage of synthetic turbulence generator
142	! - adjust Rayleigh damping depending on the time-depending atmospheric
143	! conditions
144	!
145	!
146	! Description:
147	! ------------
148	!> Offline nesting in larger-scale models. Boundary conditions for the simulation
149	!> are read from NetCDF file and are prescribed onto the respective arrays.
150	!> Further, a mass-flux correction is performed to maintain the mass balance.
151	!--------------------------------------------------------------------------------!
152	MODULE nesting_offl_mod
153
154	USE arrays_3d, &
155	ONLY: dzw, &
156	e, &
157	drho_air_zw, &
158	diss, &
159	pt, &
160	pt_init, &
161	q, &
162	q_init, &
163	rdf, &
164	rdf_sc, &
165	rho_air, &
166	rho_air_zw, &
167	s, &
168	u, &
169	u_init, &
170	ug, &
171	v, &
172	v_init, &
173	vg, &
174	w, &
175	zu, &
176	zw
177
178	USE basic_constants_and_equations_mod, &
179	ONLY: g, &
180	pi
181
182	USE chem_modules, &
183	ONLY: chem_species, nesting_offline_chem
184
185	USE control_parameters, &
186	ONLY: air_chemistry, &
187	bc_dirichlet_l, &
188	bc_dirichlet_n, &
189	bc_dirichlet_r, &
190	bc_dirichlet_s, &
191	coupling_char, &
192	dt_3d, &
193	dz, &
194	constant_diffusion, &
195	child_domain, &
196	debug_output_timestep, &
197	end_time, &
198	humidity, &
199	initializing_actions, &
200	message_string, &
201	nesting_offline, &
202	neutral, &
203	passive_scalar, &
204	rans_mode, &
205	rans_tke_e, &
206	rayleigh_damping_factor, &
207	rayleigh_damping_height, &
208	salsa, &
209	spinup_time, &
210	time_since_reference_point, &
211	volume_flow
212
213	USE cpulog, &
214	ONLY: cpu_log, &
215	log_point, &
216	log_point_s
217
218	USE grid_variables
219
220	USE indices, &
221	ONLY: nbgp, nx, nxl, nxlg, nxlu, nxr, nxrg, ny, nys, &
222	nysv, nysg, nyn, nyng, nzb, nz, nzt, &
223	topo_top_ind, &
224	wall_flags_total_0
225
226	USE kinds
227
228	USE netcdf_data_input_mod, &
229	ONLY: char_fill, &
230	char_lod, &
231	check_existence, &
232	close_input_file, &
233	get_attribute, &
234	get_dimension_length, &
235	get_variable, &
236	get_variable_pr, &
237	input_pids_dynamic, &
238	inquire_num_variables, &
239	inquire_variable_names, &
240	input_file_dynamic, &
241	num_var_pids, &
242	open_read_file, &
243	pids_id
244
245	USE pegrid
246
247	USE salsa_mod, &
248	ONLY: salsa_nesting_offl_bc, &
249	salsa_nesting_offl_init, &
250	salsa_nesting_offl_input
251
252	IMPLICIT NONE
253
254	!
255	!-- Define data type for nesting in larger-scale models like COSMO.
256	!-- Data type comprises u, v, w, pt, and q at lateral and top boundaries.
257	TYPE nest_offl_type
258
259	CHARACTER(LEN=16) :: char_l = 'ls_forcing_left_' !< leading substring for variables at left boundary
260	CHARACTER(LEN=17) :: char_n = 'ls_forcing_north_' !< leading substring for variables at north boundary
261	CHARACTER(LEN=17) :: char_r = 'ls_forcing_right_' !< leading substring for variables at right boundary
262	CHARACTER(LEN=17) :: char_s = 'ls_forcing_south_' !< leading substring for variables at south boundary
263	CHARACTER(LEN=15) :: char_t = 'ls_forcing_top_' !< leading substring for variables at top boundary
264
265	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names !< list of variable in dynamic input file
266	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_l !< names of mesoscale nested chemistry variables at left boundary
267	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_n !< names of mesoscale nested chemistry variables at north boundary
268	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_r !< names of mesoscale nested chemistry variables at right boundary
269	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_s !< names of mesoscale nested chemistry variables at south boundary
270	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_t !< names of mesoscale nested chemistry variables at top boundary
271
272	INTEGER(iwp) :: lod_east_pt = 2 !< level-of-detail of input data of potential temperature at the eastern boundary
273	INTEGER(iwp) :: lod_east_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the eastern boundary
274	INTEGER(iwp) :: lod_east_qv = 2 !< level-of-detail of input data of specific humidity at the eastern boundary
275	INTEGER(iwp) :: lod_east_u = 2 !< level-of-detail of input data of the u-component at the eastern boundary
276	INTEGER(iwp) :: lod_east_v = 2 !< level-of-detail of input data of the v-component at the eastern boundary
277	INTEGER(iwp) :: lod_east_w = 2 !< level-of-detail of input data of the w-component at the eastern boundary
278	INTEGER(iwp) :: lod_north_pt = 2 !< level-of-detail of input data of potential temperature at the northern boundary
279	INTEGER(iwp) :: lod_north_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the northern boundary
280	INTEGER(iwp) :: lod_north_qv = 2 !< level-of-detail of input data of specific humidity at the northern boundary
281	INTEGER(iwp) :: lod_north_u = 2 !< level-of-detail of input data of the u-component at the northern boundary
282	INTEGER(iwp) :: lod_north_v = 2 !< level-of-detail of input data of the v-component at the northern boundary
283	INTEGER(iwp) :: lod_north_w = 2 !< level-of-detail of input data of the w-component at the northern boundary
284	INTEGER(iwp) :: lod_south_pt = 2 !< level-of-detail of input data of potential temperature at the southern boundary
285	INTEGER(iwp) :: lod_south_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the southern boundary
286	INTEGER(iwp) :: lod_south_qv = 2 !< level-of-detail of input data of specific humidity at the southern boundary
287	INTEGER(iwp) :: lod_south_u = 2 !< level-of-detail of input data of the u-component at the southern boundary
288	INTEGER(iwp) :: lod_south_v = 2 !< level-of-detail of input data of the v-component at the southern boundary
289	INTEGER(iwp) :: lod_south_w = 2 !< level-of-detail of input data of the w-component at the southern boundary
290	INTEGER(iwp) :: lod_top_pt = 2 !< level-of-detail of input data of potential temperature at the top boundary
291	INTEGER(iwp) :: lod_top_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the top boundary
292	INTEGER(iwp) :: lod_top_qv = 2 !< level-of-detail of input data of specific humidity at the top boundary
293	INTEGER(iwp) :: lod_top_u = 2 !< level-of-detail of input data of the u-component at the top boundary
294	INTEGER(iwp) :: lod_top_v = 2 !< level-of-detail of input data of the v-component at the top boundary
295	INTEGER(iwp) :: lod_top_w = 2 !< level-of-detail of input data of the w-component at the top boundary
296	INTEGER(iwp) :: lod_west_pt = 2 !< level-of-detail of input data of potential temperature at the western boundary
297	INTEGER(iwp) :: lod_west_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the western boundary
298	INTEGER(iwp) :: lod_west_qv = 2 !< level-of-detail of input data of specific humidity at the western boundary
299	INTEGER(iwp) :: lod_west_u = 2 !< level-of-detail of input data of the u-component at the western boundary
300	INTEGER(iwp) :: lod_west_v = 2 !< level-of-detail of input data of the v-component at the western boundary
301	INTEGER(iwp) :: lod_west_w = 2 !< level-of-detail of input data of the w-component at the western boundary
302	INTEGER(iwp) :: nt !< number of time levels in dynamic input file
303	INTEGER(iwp) :: nzu !< number of vertical levels on scalar grid in dynamic input file
304	INTEGER(iwp) :: nzw !< number of vertical levels on w grid in dynamic input file
305	INTEGER(iwp) :: tind = 0 !< time index for reference time in mesoscale-offline nesting
306	INTEGER(iwp) :: tind_p = 0 !< time index for following time in mesoscale-offline nesting
307
308	LOGICAL :: init = .FALSE. !< flag indicating that offline nesting is already initialized
309
310	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_l !< flags inidicating whether left boundary data for chemistry is in dynamic input file
311	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_n !< flags inidicating whether north boundary data for chemistry is in dynamic input file
312	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_r !< flags inidicating whether right boundary data for chemistry is in dynamic input file
313	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_s !< flags inidicating whether south boundary data for chemistry is in dynamic input file
314	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_t !< flags inidicating whether top boundary data for chemistry is in dynamic input file
315
316	REAL(wp), DIMENSION(:), ALLOCATABLE :: surface_pressure !< time dependent surface pressure
317	REAL(wp), DIMENSION(:), ALLOCATABLE :: time !< time levels in dynamic input file
318	REAL(wp), DIMENSION(:), ALLOCATABLE :: zu_atmos !< vertical levels at scalar grid in dynamic input file
319	REAL(wp), DIMENSION(:), ALLOCATABLE :: zw_atmos !< vertical levels at w grid in dynamic input file
320
321	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ug !< domain-averaged geostrophic component
322	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: vg !< domain-averaged geostrophic component
323
324	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_l !< mixing ratio at left boundary
325	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_n !< mixing ratio at north boundary
326	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_r !< mixing ratio at right boundary
327	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_s !< mixing ratio at south boundary
328	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_top !< mixing ratio at top boundary
329	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_l !< potentital temperautre at left boundary
330	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_n !< potentital temperautre at north boundary
331	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_r !< potentital temperautre at right boundary
332	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_s !< potentital temperautre at south boundary
333	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_top !< potentital temperautre at top boundary
334	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_l !< u-component at left boundary
335	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_n !< u-component at north boundary
336	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_r !< u-component at right boundary
337	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_s !< u-component at south boundary
338	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_top !< u-component at top boundary
339	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_l !< v-component at left boundary
340	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_n !< v-component at north boundary
341	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_r !< v-component at right boundary
342	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_s !< v-component at south boundary
343	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_top !< v-component at top boundary
344	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_l !< w-component at left boundary
345	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_n !< w-component at north boundary
346	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_r !< w-component at right boundary
347	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_s !< w-component at south boundary
348	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_top !< w-component at top boundary
349
350	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_l !< chemical species at left boundary
351	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_n !< chemical species at north boundary
352	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_r !< chemical species at right boundary
353	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_s !< chemical species at south boundary
354	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_top !< chemical species at left boundary
355
356	END TYPE nest_offl_type
357
358	INTEGER(iwp) :: i_bound !< boundary grid point in x-direction for scalars, v, and w
359	INTEGER(iwp) :: i_bound_u !< boundary grid point in x-direction for u
360	INTEGER(iwp) :: i_start !< start index for array allocation along x-direction at norther/southern boundary (scalars, v, w)
361	INTEGER(iwp) :: i_start_u !< start index for array allocation along x-direction at norther/southern boundary (u)
362	INTEGER(iwp) :: i_end !< end index for array allocation along x-direction at norther/southern boundary
363	INTEGER(iwp) :: j_bound !< boundary grid point in y-direction for scalars, u, and w
364	INTEGER(iwp) :: j_bound_v !< boundary grid point in y-direction for v
365	INTEGER(iwp) :: j_start !< start index for array allocation along y-direction at eastern/western boundary (scalars, u, w)
366	INTEGER(iwp) :: j_start_v !< start index for array allocation along y-direction at eastern/western boundary (v)
367	INTEGER(iwp) :: j_end !< end index for array allocation along y-direction at eastern/western boundary
368	INTEGER(iwp) :: lod !< level-of-detail of lateral input data
369
370	REAL(wp) :: fac_dt !< interpolation factor
371	REAL(wp) :: zi_ribulk = 0.0_wp !< boundary-layer depth according to bulk Richardson criterion, i.e. the height where Ri_bulk exceeds the critical
372	!< bulk Richardson number of 0.2
373
374	TYPE(nest_offl_type) :: nest_offl !< data structure for data input at lateral and top boundaries (provided by Inifor)
375
376	SAVE
377	PRIVATE
378	!
379	!-- Public subroutines
380	PUBLIC nesting_offl_bc, &
381	nesting_offl_calc_zi, &
382	nesting_offl_check_parameters, &
383	nesting_offl_geostrophic_wind, &
384	nesting_offl_header, &
385	nesting_offl_init, &
386	nesting_offl_input, &
387	nesting_offl_interpolation_factor, &
388	nesting_offl_mass_conservation, &
389	nesting_offl_parin
390	!
391	!-- Public variables
392	PUBLIC zi_ribulk
393
394	INTERFACE nesting_offl_bc
395	MODULE PROCEDURE nesting_offl_bc
396	END INTERFACE nesting_offl_bc
397
398	INTERFACE nesting_offl_calc_zi
399	MODULE PROCEDURE nesting_offl_calc_zi
400	END INTERFACE nesting_offl_calc_zi
401
402	INTERFACE nesting_offl_check_parameters
403	MODULE PROCEDURE nesting_offl_check_parameters
404	END INTERFACE nesting_offl_check_parameters
405
406	INTERFACE nesting_offl_geostrophic_wind
407	MODULE PROCEDURE nesting_offl_geostrophic_wind
408	END INTERFACE nesting_offl_geostrophic_wind
409
410	INTERFACE nesting_offl_header
411	MODULE PROCEDURE nesting_offl_header
412	END INTERFACE nesting_offl_header
413
414	INTERFACE nesting_offl_init
415	MODULE PROCEDURE nesting_offl_init
416	END INTERFACE nesting_offl_init
417
418	INTERFACE nesting_offl_input
419	MODULE PROCEDURE nesting_offl_input
420	END INTERFACE nesting_offl_input
421
422	INTERFACE nesting_offl_interpolation_factor
423	MODULE PROCEDURE nesting_offl_interpolation_factor
424	END INTERFACE nesting_offl_interpolation_factor
425
426	INTERFACE nesting_offl_mass_conservation
427	MODULE PROCEDURE nesting_offl_mass_conservation
428	END INTERFACE nesting_offl_mass_conservation
429
430	INTERFACE nesting_offl_parin
431	MODULE PROCEDURE nesting_offl_parin
432	END INTERFACE nesting_offl_parin
433
434	CONTAINS
435
436	!------------------------------------------------------------------------------!
437	! Description:
438	! ------------
439	!> Reads data at lateral and top boundaries derived from larger-scale model.
440	!------------------------------------------------------------------------------!
441	SUBROUTINE nesting_offl_input
442
443	INTEGER(iwp) :: n !< running index for chemistry variables
444
445	!
446	!-- Initialize INIFOR forcing in first call.
447	IF ( .NOT. nest_offl%init ) THEN
448	#if defined ( __netcdf )
449	!
450	!-- Open file in read-only mode
451	CALL open_read_file( TRIM( input_file_dynamic ) // &
452	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, &
484	'surface_forcing_surface_pressure' ) ) THEN
485	ALLOCATE( nest_offl%surface_pressure(0:nest_offl%nt-1) )
486	CALL get_variable( pids_id, &
487	'surface_forcing_surface_pressure', &
488	nest_offl%surface_pressure )
489	ENDIF
490	!
491	!-- Close input file
492	CALL close_input_file( pids_id )
493	#endif
494	ENDIF
495	!
496	!-- Check if dynamic driver data input is required.
497	IF ( nest_offl%time(nest_offl%tind_p) <= &
498	MAX( time_since_reference_point, 0.0_wp) .OR. &
499	.NOT. nest_offl%init ) THEN
500	CONTINUE
501	!
502	!-- Return otherwise
503	ELSE
504	RETURN
505	ENDIF
506	!
507	!-- Start of CPU measurement
508	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'start' )
509	!
510	!-- Obtain time index for current point in time. Note, the time coordinate
511	!-- in the input file is always relative to the initial time in UTC, i.e.
512	!-- the time coordinate always starts at 0.0 even if the initial UTC is e.g.
513	!-- 7200.0. Further, since time_since_reference_point is negativ here when
514	!-- spinup is applied, use MAX function to obtain correct time index.
515	nest_offl%tind = MINLOC( ABS( nest_offl%time - MAX( time_since_reference_point, 0.0_wp) ), &
516	DIM = 1 ) - 1
517	!
518	!-- Note, in case of restart runs, the time index for the boundary data may indicate a time
519	!-- in the future. This needs to be checked and corrected.
520	IF ( TRIM( initializing_actions ) == 'read_restart_data' .AND. &
521	nest_offl%time(nest_offl%tind) > time_since_reference_point ) THEN
522	nest_offl%tind = nest_offl%tind - 1
523	ENDIF
524	nest_offl%tind_p = nest_offl%tind + 1
525	!
526	!-- Open file in read-only mode
527	#if defined ( __netcdf )
528	CALL open_read_file( TRIM( input_file_dynamic ) // &
529	TRIM( coupling_char ), pids_id )
530	!
531	!-- Read geostrophic wind components
532	! DO t = nest_offl%tind, nest_offl%tind_p
533	! CALL get_variable_pr( pids_id, 'ls_forcing_ug', t+1, &
534	! nest_offl%ug(t-nest_offl%tind,nzb+1:nzt) )
535	! CALL get_variable_pr( pids_id, 'ls_forcing_vg', t+1, &
536	! nest_offl%vg(t-nest_offl%tind,nzb+1:nzt) )
537	! ENDDO
538	!
539	!-- Read data at lateral and top boundaries. Please note, at left and
540	!-- right domain boundary, yz-layers are read for u, v, w, pt and q.
541	!-- For the v-component, the data starts at nysv, while for the other
542	!-- quantities the data starts at nys. This is equivalent at the north
543	!-- and south domain boundary for the u-component (nxlu).
544	!-- Note, lateral data is also accessed by parallel IO, which is the reason
545	!-- why different arguments are passed depending on the boundary control
546	!-- flags. Cores that do not belong to the respective boundary only do
547	!-- a dummy read with count = 0, just in order to participate the collective
548	!-- operation. This is because collective parallel access shows better
549	!-- performance than just a conditional access.
550	!-- Read data for LOD 2, i.e. time-dependent xz-, yz-, and xy-slices.
551	IF ( lod == 2 ) THEN
552	CALL get_variable( pids_id, 'ls_forcing_left_u', &
553	nest_offl%u_l, & ! array to be read
554	MERGE( nys+1, 1, bc_dirichlet_l), & ! start index y direction
555	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
556	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
557	MERGE( nyn-nys+1, 0, bc_dirichlet_l), & ! number of elements along y
558	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements alogn z
559	MERGE( 2, 0, bc_dirichlet_l), & ! number of time steps (2 or 0)
560	.TRUE. ) ! parallel IO when compiled accordingly
561
562	CALL get_variable( pids_id, 'ls_forcing_left_v', &
563	nest_offl%v_l, &
564	MERGE( nysv, 1, bc_dirichlet_l), &
565	MERGE( nzb+1, 1, bc_dirichlet_l), &
566	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
567	MERGE( nyn-nysv+1, 0, bc_dirichlet_l), &
568	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
569	MERGE( 2, 0, bc_dirichlet_l), &
570	.TRUE. )
571
572	CALL get_variable( pids_id, 'ls_forcing_left_w', &
573	nest_offl%w_l, &
574	MERGE( nys+1, 1, bc_dirichlet_l), &
575	MERGE( nzb+1, 1, bc_dirichlet_l), &
576	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
577	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
578	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
579	MERGE( 2, 0, bc_dirichlet_l), &
580	.TRUE. )
581
582	IF ( .NOT. neutral ) THEN
583	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
584	nest_offl%pt_l, &
585	MERGE( nys+1, 1, bc_dirichlet_l), &
586	MERGE( nzb+1, 1, bc_dirichlet_l), &
587	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
588	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
589	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
590	MERGE( 2, 0, bc_dirichlet_l), &
591	.TRUE. )
592	ENDIF
593
594	IF ( humidity ) THEN
595	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
596	nest_offl%q_l, &
597	MERGE( nys+1, 1, bc_dirichlet_l), &
598	MERGE( nzb+1, 1, bc_dirichlet_l), &
599	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
600	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
601	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
602	MERGE( 2, 0, bc_dirichlet_l), &
603	.TRUE. )
604	ENDIF
605
606	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
607	DO n = 1, UBOUND(nest_offl%var_names_chem_l, 1)
608	IF ( check_existence( nest_offl%var_names, &
609	nest_offl%var_names_chem_l(n) ) ) THEN
610	CALL get_variable( pids_id, &
611	TRIM( nest_offl%var_names_chem_l(n) ), &
612	nest_offl%chem_l(:,:,:,n), &
613	MERGE( nys+1, 1, bc_dirichlet_l), &
614	MERGE( nzb+1, 1, bc_dirichlet_l), &
615	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
616	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
617	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
618	MERGE( 2, 0, bc_dirichlet_l), &
619	.TRUE. )
620	nest_offl%chem_from_file_l(n) = .TRUE.
621	ENDIF
622	ENDDO
623	ENDIF
624	!
625	!-- Read data for eastern boundary
626	CALL get_variable( pids_id, 'ls_forcing_right_u', &
627	nest_offl%u_r, &
628	MERGE( nys+1, 1, bc_dirichlet_r), &
629	MERGE( nzb+1, 1, bc_dirichlet_r), &
630	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
631	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
632	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
633	MERGE( 2, 0, bc_dirichlet_r), &
634	.TRUE. )
635
636	CALL get_variable( pids_id, 'ls_forcing_right_v', &
637	nest_offl%v_r, &
638	MERGE( nysv, 1, bc_dirichlet_r), &
639	MERGE( nzb+1, 1, bc_dirichlet_r), &
640	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
641	MERGE( nyn-nysv+1, 0, bc_dirichlet_r), &
642	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
643	MERGE( 2, 0, bc_dirichlet_r), &
644	.TRUE. )
645
646	CALL get_variable( pids_id, 'ls_forcing_right_w', &
647	nest_offl%w_r, &
648	MERGE( nys+1, 1, bc_dirichlet_r), &
649	MERGE( nzb+1, 1, bc_dirichlet_r), &
650	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
651	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
652	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
653	MERGE( 2, 0, bc_dirichlet_r), &
654	.TRUE. )
655
656	IF ( .NOT. neutral ) THEN
657	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
658	nest_offl%pt_r, &
659	MERGE( nys+1, 1, bc_dirichlet_r), &
660	MERGE( nzb+1, 1, bc_dirichlet_r), &
661	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
662	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
663	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
664	MERGE( 2, 0, bc_dirichlet_r), &
665	.TRUE. )
666	ENDIF
667
668	IF ( humidity ) THEN
669	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
670	nest_offl%q_r, &
671	MERGE( nys+1, 1, bc_dirichlet_r), &
672	MERGE( nzb+1, 1, bc_dirichlet_r), &
673	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
674	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
675	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
676	MERGE( 2, 0, bc_dirichlet_r), &
677	.TRUE. )
678	ENDIF
679
680	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
681	DO n = 1, UBOUND(nest_offl%var_names_chem_r, 1)
682	IF ( check_existence( nest_offl%var_names, &
683	nest_offl%var_names_chem_r(n) ) ) THEN
684	CALL get_variable( pids_id, &
685	TRIM( nest_offl%var_names_chem_r(n) ), &
686	nest_offl%chem_r(:,:,:,n), &
687	MERGE( nys+1, 1, bc_dirichlet_r), &
688	MERGE( nzb+1, 1, bc_dirichlet_r), &
689	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
690	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
691	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
692	MERGE( 2, 0, bc_dirichlet_r), &
693	.TRUE. )
694	nest_offl%chem_from_file_r(n) = .TRUE.
695	ENDIF
696	ENDDO
697	ENDIF
698	!
699	!-- Read data for northern boundary
700	CALL get_variable( pids_id, 'ls_forcing_north_u', &
701	nest_offl%u_n, &
702	MERGE( nxlu, 1, bc_dirichlet_n ), &
703	MERGE( nzb+1, 1, bc_dirichlet_n ), &
704	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
705	MERGE( nxr-nxlu+1, 0, bc_dirichlet_n ), &
706	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
707	MERGE( 2, 0, bc_dirichlet_n ), &
708	.TRUE. )
709
710	CALL get_variable( pids_id, 'ls_forcing_north_v', &
711	nest_offl%v_n, &
712	MERGE( nxl+1, 1, bc_dirichlet_n ), &
713	MERGE( nzb+1, 1, bc_dirichlet_n ), &
714	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
715	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
716	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
717	MERGE( 2, 0, bc_dirichlet_n ), &
718	.TRUE. )
719
720	CALL get_variable( pids_id, 'ls_forcing_north_w', &
721	nest_offl%w_n, &
722	MERGE( nxl+1, 1, bc_dirichlet_n ), &
723	MERGE( nzb+1, 1, bc_dirichlet_n ), &
724	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
725	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
726	MERGE( nest_offl%nzw, 0, bc_dirichlet_n ), &
727	MERGE( 2, 0, bc_dirichlet_n ), &
728	.TRUE. )
729
730	IF ( .NOT. neutral ) THEN
731	CALL get_variable( pids_id, 'ls_forcing_north_pt', &
732	nest_offl%pt_n, &
733	MERGE( nxl+1, 1, bc_dirichlet_n ), &
734	MERGE( nzb+1, 1, bc_dirichlet_n ), &
735	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
736	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
737	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
738	MERGE( 2, 0, bc_dirichlet_n ), &
739	.TRUE. )
740	ENDIF
741	IF ( humidity ) THEN
742	CALL get_variable( pids_id, 'ls_forcing_north_qv', &
743	nest_offl%q_n, &
744	MERGE( nxl+1, 1, bc_dirichlet_n ), &
745	MERGE( nzb+1, 1, bc_dirichlet_n ), &
746	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
747	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
748	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
749	MERGE( 2, 0, bc_dirichlet_n ), &
750	.TRUE. )
751	ENDIF
752
753	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
754	DO n = 1, UBOUND(nest_offl%var_names_chem_n, 1)
755	IF ( check_existence( nest_offl%var_names, &
756	nest_offl%var_names_chem_n(n) ) ) THEN
757	CALL get_variable( pids_id, &
758	TRIM( nest_offl%var_names_chem_n(n) ), &
759	nest_offl%chem_n(:,:,:,n), &
760	MERGE( nxl+1, 1, bc_dirichlet_n ), &
761	MERGE( nzb+1, 1, bc_dirichlet_n ), &
762	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
763	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
764	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
765	MERGE( 2, 0, bc_dirichlet_n ), &
766	.TRUE. )
767	nest_offl%chem_from_file_n(n) = .TRUE.
768	ENDIF
769	ENDDO
770	ENDIF
771	!
772	!-- Read data for southern boundary
773	CALL get_variable( pids_id, 'ls_forcing_south_u', &
774	nest_offl%u_s, &
775	MERGE( nxlu, 1, bc_dirichlet_s ), &
776	MERGE( nzb+1, 1, bc_dirichlet_s ), &
777	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
778	MERGE( nxr-nxlu+1, 0, bc_dirichlet_s ), &
779	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
780	MERGE( 2, 0, bc_dirichlet_s ), &
781	.TRUE. )
782
783	CALL get_variable( pids_id, 'ls_forcing_south_v', &
784	nest_offl%v_s, &
785	MERGE( nxl+1, 1, bc_dirichlet_s ), &
786	MERGE( nzb+1, 1, bc_dirichlet_s ), &
787	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
788	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
789	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
790	MERGE( 2, 0, bc_dirichlet_s ), &
791	.TRUE. )
792
793	CALL get_variable( pids_id, 'ls_forcing_south_w', &
794	nest_offl%w_s, &
795	MERGE( nxl+1, 1, bc_dirichlet_s ), &
796	MERGE( nzb+1, 1, bc_dirichlet_s ), &
797	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
798	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
799	MERGE( nest_offl%nzw, 0, bc_dirichlet_s ), &
800	MERGE( 2, 0, bc_dirichlet_s ), &
801	.TRUE. )
802
803	IF ( .NOT. neutral ) THEN
804	CALL get_variable( pids_id, 'ls_forcing_south_pt', &
805	nest_offl%pt_s, &
806	MERGE( nxl+1, 1, bc_dirichlet_s ), &
807	MERGE( nzb+1, 1, bc_dirichlet_s ), &
808	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
809	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
810	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
811	MERGE( 2, 0, bc_dirichlet_s ), &
812	.TRUE. )
813	ENDIF
814	IF ( humidity ) THEN
815	CALL get_variable( pids_id, 'ls_forcing_south_qv', &
816	nest_offl%q_s, &
817	MERGE( nxl+1, 1, bc_dirichlet_s ), &
818	MERGE( nzb+1, 1, bc_dirichlet_s ), &
819	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
820	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
821	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
822	MERGE( 2, 0, bc_dirichlet_s ), &
823	.TRUE. )
824	ENDIF
825
826	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
827	DO n = 1, UBOUND(nest_offl%var_names_chem_s, 1)
828	IF ( check_existence( nest_offl%var_names, &
829	nest_offl%var_names_chem_s(n) ) ) THEN
830	CALL get_variable( pids_id, &
831	TRIM( nest_offl%var_names_chem_s(n) ), &
832	nest_offl%chem_s(:,:,:,n), &
833	MERGE( nxl+1, 1, bc_dirichlet_s ), &
834	MERGE( nzb+1, 1, bc_dirichlet_s ), &
835	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
836	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
837	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
838	MERGE( 2, 0, bc_dirichlet_s ), &
839	.TRUE. )
840	nest_offl%chem_from_file_s(n) = .TRUE.
841	ENDIF
842	ENDDO
843	ENDIF
844	!
845	!-- Top boundary
846	CALL get_variable( pids_id, 'ls_forcing_top_u', &
847	nest_offl%u_top(0:1,nys:nyn,nxlu:nxr), &
848	nxlu, nys+1, nest_offl%tind+1, &
849	nxr-nxlu+1, nyn-nys+1, 2, .TRUE. )
850
851	CALL get_variable( pids_id, 'ls_forcing_top_v', &
852	nest_offl%v_top(0:1,nysv:nyn,nxl:nxr), &
853	nxl+1, nysv, nest_offl%tind+1, &
854	nxr-nxl+1, nyn-nysv+1, 2, .TRUE. )
855
856	CALL get_variable( pids_id, 'ls_forcing_top_w', &
857	nest_offl%w_top(0:1,nys:nyn,nxl:nxr), &
858	nxl+1, nys+1, nest_offl%tind+1, &
859	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
860
861	IF ( .NOT. neutral ) THEN
862	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
863	nest_offl%pt_top(0:1,nys:nyn,nxl:nxr), &
864	nxl+1, nys+1, nest_offl%tind+1, &
865	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
866	ENDIF
867	IF ( humidity ) THEN
868	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
869	nest_offl%q_top(0:1,nys:nyn,nxl:nxr), &
870	nxl+1, nys+1, nest_offl%tind+1, &
871	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
872	ENDIF
873
874	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
875	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
876	IF ( check_existence( nest_offl%var_names, &
877	nest_offl%var_names_chem_t(n) ) ) THEN
878	CALL get_variable( pids_id, &
879	TRIM( nest_offl%var_names_chem_t(n) ), &
880	nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,n), &
881	nxl+1, nys+1, nest_offl%tind+1, &
882	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
883	nest_offl%chem_from_file_t(n) = .TRUE.
884	ENDIF
885	ENDDO
886	ENDIF
887	!
888	!-- Read data for LOD 1, i.e. time-dependent profiles. In constrast to LOD 2 where the amount of
889	!-- IO is larger, only the respective boundary processes read the data.
890	ELSE
891	IF ( bc_dirichlet_l ) THEN
892	CALL get_variable( pids_id, 'ls_forcing_left_u', &
893	nest_offl%u_l(0:1,:,1:1), & ! array to be read
894	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
895	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
896	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements along z
897	MERGE( 2, 0, bc_dirichlet_l) ) ! number of time steps (2 or 0)
898	CALL get_variable( pids_id, 'ls_forcing_left_v', &
899	nest_offl%v_l(0:1,:,1:1), &
900	MERGE( nzb+1, 1, bc_dirichlet_l), &
901	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
902	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
903	MERGE( 2, 0, bc_dirichlet_l) )
904	CALL get_variable( pids_id, 'ls_forcing_left_w', &
905	nest_offl%w_l(0:1,:,1:1), &
906	MERGE( nzb+1, 1, bc_dirichlet_l), &
907	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
908	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
909	MERGE( 2, 0, bc_dirichlet_l) )
910	IF ( .NOT. neutral ) THEN
911	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
912	nest_offl%pt_l(0:1,:,1:1), &
913	MERGE( nzb+1, 1, bc_dirichlet_l), &
914	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
915	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
916	MERGE( 2, 0, bc_dirichlet_l) )
917	ENDIF
918	IF ( humidity ) THEN
919	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
920	nest_offl%q_l(0:1,:,1:1), &
921	MERGE( nzb+1, 1, bc_dirichlet_l), &
922	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
923	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
924	MERGE( 2, 0, bc_dirichlet_l) )
925	ENDIF
926	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
927	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
928	IF ( check_existence( nest_offl%var_names, &
929	nest_offl%var_names_chem_t(n) ) ) THEN
930	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
931	nest_offl%chem_l(0:1,:,1:1,n), &
932	MERGE( nzb+1, 1, bc_dirichlet_l), &
933	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
934	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
935	MERGE( 2, 0, bc_dirichlet_l) )
936	nest_offl%chem_from_file_l(n) = .TRUE.
937	ENDIF
938	ENDDO
939	ENDIF
940	ENDIF
941	IF ( bc_dirichlet_r ) THEN
942	CALL get_variable( pids_id, 'ls_forcing_right_u', &
943	nest_offl%u_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%nzu, 0, bc_dirichlet_r), &
947	MERGE( 2, 0, bc_dirichlet_r) )
948	CALL get_variable( pids_id, 'ls_forcing_right_v', &
949	nest_offl%v_r(0:1,:,1:1), &
950	MERGE( nzb+1, 1, bc_dirichlet_r), &
951	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
952	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
953	MERGE( 2, 0, bc_dirichlet_r) )
954	CALL get_variable( pids_id, 'ls_forcing_right_w', &
955	nest_offl%w_r(0:1,:,1:1), &
956	MERGE( nzb+1, 1, bc_dirichlet_r), &
957	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
958	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
959	MERGE( 2, 0, bc_dirichlet_r) )
960	IF ( .NOT. neutral ) THEN
961	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
962	nest_offl%pt_r(0:1,:,1:1), &
963	MERGE( nzb+1, 1, bc_dirichlet_r), &
964	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
965	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
966	MERGE( 2, 0, bc_dirichlet_r) )
967	ENDIF
968	IF ( humidity ) THEN
969	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
970	nest_offl%q_r(0:1,:,1:1), &
971	MERGE( nzb+1, 1, bc_dirichlet_r), &
972	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
973	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
974	MERGE( 2, 0, bc_dirichlet_r) )
975	ENDIF
976	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
977	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
978	IF ( check_existence( nest_offl%var_names, &
979	nest_offl%var_names_chem_t(n) ) ) THEN
980	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
981	nest_offl%chem_r(0:1,:,1:1,n), &
982	MERGE( nzb+1, 1, bc_dirichlet_r), &
983	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
984	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
985	MERGE( 2, 0, bc_dirichlet_r) )
986	nest_offl%chem_from_file_r(n) = .TRUE.
987	ENDIF
988	ENDDO
989	ENDIF
990	ENDIF
991	IF ( bc_dirichlet_n ) THEN
992	CALL get_variable( pids_id, 'ls_forcing_north_u', &
993	nest_offl%u_n(0:1,:,1:1), &
994	MERGE( nzb+1, 1, bc_dirichlet_n), &
995	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
996	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
997	MERGE( 2, 0, bc_dirichlet_n) )
998	CALL get_variable( pids_id, 'ls_forcing_north_v', &
999	nest_offl%v_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	CALL get_variable( pids_id, 'ls_forcing_north_w', &
1005	nest_offl%w_n(0:1,:,1:1), &
1006	MERGE( nzb+1, 1, bc_dirichlet_n), &
1007	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1008	MERGE( nest_offl%nzw, 0, bc_dirichlet_n), &
1009	MERGE( 2, 0, bc_dirichlet_n) )
1010	IF ( .NOT. neutral ) THEN
1011	CALL get_variable( pids_id, 'ls_forcing_north_pt', &
1012	nest_offl%pt_n(0:1,:,1:1), &
1013	MERGE( nzb+1, 1, bc_dirichlet_n), &
1014	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1015	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1016	MERGE( 2, 0, bc_dirichlet_n) )
1017	ENDIF
1018	IF ( humidity ) THEN
1019	CALL get_variable( pids_id, 'ls_forcing_north_qv', &
1020	nest_offl%q_n(0:1,:,1:1), &
1021	MERGE( nzb+1, 1, bc_dirichlet_n), &
1022	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1023	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1024	MERGE( 2, 0, bc_dirichlet_n) )
1025	ENDIF
1026	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1027	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
1028	IF ( check_existence( nest_offl%var_names, &
1029	nest_offl%var_names_chem_t(n) ) ) THEN
1030	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1031	nest_offl%chem_n(0:1,:,1:1,n), &
1032	MERGE( nzb+1, 1, bc_dirichlet_n), &
1033	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1034	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1035	MERGE( 2, 0, bc_dirichlet_n) )
1036	nest_offl%chem_from_file_n(n) = .TRUE.
1037	ENDIF
1038	ENDDO
1039	ENDIF
1040	ENDIF
1041	IF ( bc_dirichlet_s ) THEN
1042	CALL get_variable( pids_id, 'ls_forcing_south_u', &
1043	nest_offl%u_s(0:1,:,1:1), &
1044	MERGE( nzb+1, 1, bc_dirichlet_s), &
1045	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1046	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1047	MERGE( 2, 0, bc_dirichlet_s) )
1048	CALL get_variable( pids_id, 'ls_forcing_south_v', &
1049	nest_offl%v_s(0:1,:,1:1), &
1050	MERGE( nzb+1, 1, bc_dirichlet_s), &
1051	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1052	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1053	MERGE( 2, 0, bc_dirichlet_s) )
1054	CALL get_variable( pids_id, 'ls_forcing_south_w', &
1055	nest_offl%w_s(0:1,:,1:1), &
1056	MERGE( nzb+1, 1, bc_dirichlet_s), &
1057	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1058	MERGE( nest_offl%nzw, 0, bc_dirichlet_s), &
1059	MERGE( 2, 0, bc_dirichlet_s) )
1060	IF ( .NOT. neutral ) THEN
1061	CALL get_variable( pids_id, 'ls_forcing_south_pt', &
1062	nest_offl%pt_s(0:1,:,1:1), &
1063	MERGE( nzb+1, 1, bc_dirichlet_s), &
1064	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1065	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1066	MERGE( 2, 0, bc_dirichlet_s) )
1067	ENDIF
1068	IF ( humidity ) THEN
1069	CALL get_variable( pids_id, 'ls_forcing_south_qv', &
1070	nest_offl%q_s(0:1,:,1:1), &
1071	MERGE( nzb+1, 1, bc_dirichlet_s), &
1072	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1073	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1074	MERGE( 2, 0, bc_dirichlet_s) )
1075	ENDIF
1076	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1077	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
1078	IF ( check_existence( nest_offl%var_names, &
1079	nest_offl%var_names_chem_t(n) ) ) THEN
1080	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1081	nest_offl%chem_s(0:1,:,1:1,n), &
1082	MERGE( nzb+1, 1, bc_dirichlet_s), &
1083	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1084	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1085	MERGE( 2, 0, bc_dirichlet_s) )
1086	nest_offl%chem_from_file_s(n) = .TRUE.
1087	ENDIF
1088	ENDDO
1089	ENDIF
1090	ENDIF
1091	!
1092	!-- Read top boundary data, which is actually only a scalar value in the LOD 1 case.
1093	CALL get_variable( pids_id, 'ls_forcing_top_u', &
1094	nest_offl%u_top(0:1,1,1), & ! array to be read
1095	nest_offl%tind+1, & ! start index in time
1096	2 ) ! number of elements to be read
1097	CALL get_variable( pids_id, 'ls_forcing_top_v', &
1098	nest_offl%v_top(0:1,1,1), &
1099	nest_offl%tind+1, &
1100	2 )
1101	CALL get_variable( pids_id, 'ls_forcing_top_w', &
1102	nest_offl%w_top(0:1,1,1), &
1103	nest_offl%tind+1, &
1104	2 )
1105	IF ( .NOT. neutral ) THEN
1106	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
1107	nest_offl%pt_top(0:1,1,1), &
1108	nest_offl%tind+1, &
1109	2 )
1110	ENDIF
1111	IF ( humidity ) THEN
1112	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
1113	nest_offl%q_top(0:1,1,1), &
1114	nest_offl%tind+1, &
1115	2 )
1116	ENDIF
1117	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1118	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
1119	IF ( check_existence( nest_offl%var_names, &
1120	nest_offl%var_names_chem_t(n) ) ) THEN
1121	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1122	nest_offl%chem_top(0:1,1,1,n), &
1123	nest_offl%tind+1, &
1124	2 )
1125	nest_offl%chem_from_file_t(n) = .TRUE.
1126	ENDIF
1127	ENDDO
1128	ENDIF
1129	ENDIF
1130
1131
1132	!
1133	!-- Close input file
1134	CALL close_input_file( pids_id )
1135	#endif
1136	!
1137	!-- Set control flag to indicate that boundary data has been initially
1138	!-- input.
1139	nest_offl%init = .TRUE.
1140	!
1141	!-- Call offline nesting for salsa
1142	IF ( salsa ) CALL salsa_nesting_offl_input
1143	!
1144	!-- End of CPU measurement
1145	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'stop' )
1146
1147	END SUBROUTINE nesting_offl_input
1148
1149
1150	!------------------------------------------------------------------------------!
1151	! Description:
1152	! ------------
1153	!> In this subroutine a constant mass within the model domain is guaranteed.
1154	!> Larger-scale models may be based on a compressible equation system, which is
1155	!> not consistent with PALMs incompressible equation system. In order to avoid
1156	!> a decrease or increase of mass during the simulation, non-divergent flow
1157	!> through the lateral and top boundaries is compensated by the vertical wind
1158	!> component at the top boundary.
1159	!------------------------------------------------------------------------------!
1160	SUBROUTINE nesting_offl_mass_conservation
1161
1162	INTEGER(iwp) :: i !< grid index in x-direction
1163	INTEGER(iwp) :: j !< grid index in y-direction
1164	INTEGER(iwp) :: k !< grid index in z-direction
1165
1166	REAL(wp) :: d_area_t !< inverse of the total area of the horizontal model domain
1167	REAL(wp) :: w_correct !< vertical velocity increment required to compensate non-divergent flow through the boundaries
1168	REAL(wp), DIMENSION(1:3) :: volume_flow_l !< local volume flow
1169
1170
1171	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'start' )
1172
1173	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
1174
1175	volume_flow = 0.0_wp
1176	volume_flow_l = 0.0_wp
1177
1178	d_area_t = 1.0_wp / ( ( nx + 1 ) * dx * ( ny + 1 ) * dy )
1179
1180	IF ( bc_dirichlet_l ) THEN
1181	i = nxl
1182	DO j = nys, nyn
1183	DO k = nzb+1, nzt
1184	volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) * dy &
1185	* rho_air(k) &
1186	* MERGE( 1.0_wp, 0.0_wp, &
1187	BTEST( wall_flags_total_0(k,j,i), 1 ) )
1188	ENDDO
1189	ENDDO
1190	ENDIF
1191	IF ( bc_dirichlet_r ) THEN
1192	i = nxr+1
1193	DO j = nys, nyn
1194	DO k = nzb+1, nzt
1195	volume_flow_l(1) = volume_flow_l(1) - u(k,j,i) * dzw(k) * dy &
1196	* rho_air(k) &
1197	* MERGE( 1.0_wp, 0.0_wp, &
1198	BTEST( wall_flags_total_0(k,j,i), 1 ) )
1199	ENDDO
1200	ENDDO
1201	ENDIF
1202	IF ( bc_dirichlet_s ) THEN
1203	j = nys
1204	DO i = nxl, nxr
1205	DO k = nzb+1, nzt
1206	volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) * dx &
1207	* rho_air(k) &
1208	* MERGE( 1.0_wp, 0.0_wp, &
1209	BTEST( wall_flags_total_0(k,j,i), 2 ) )
1210	ENDDO
1211	ENDDO
1212	ENDIF
1213	IF ( bc_dirichlet_n ) THEN
1214	j = nyn+1
1215	DO i = nxl, nxr
1216	DO k = nzb+1, nzt
1217	volume_flow_l(2) = volume_flow_l(2) - v(k,j,i) * dzw(k) * dx &
1218	* rho_air(k) &
1219	* MERGE( 1.0_wp, 0.0_wp, &
1220	BTEST( wall_flags_total_0(k,j,i), 2 ) )
1221	ENDDO
1222	ENDDO
1223	ENDIF
1224	!
1225	!-- Top boundary
1226	k = nzt
1227	DO i = nxl, nxr
1228	DO j = nys, nyn
1229	volume_flow_l(3) = volume_flow_l(3) - rho_air_zw(k) * w(k,j,i) * dx * dy
1230	ENDDO
1231	ENDDO
1232
1233	#if defined( __parallel )
1234	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1235	CALL MPI_ALLREDUCE( volume_flow_l, volume_flow, 3, MPI_REAL, MPI_SUM, &
1236	comm2d, ierr )
1237	#else
1238	volume_flow = volume_flow_l
1239	#endif
1240
1241	w_correct = SUM( volume_flow ) * d_area_t * drho_air_zw(nzt)
1242
1243	DO i = nxl, nxr
1244	DO j = nys, nyn
1245	DO k = nzt, nzt + 1
1246	w(k,j,i) = w(k,j,i) + w_correct &
1247	* MERGE( 1.0_wp, 0.0_wp, &
1248	BTEST( wall_flags_total_0(k,j,i), 3 ) )
1249	ENDDO
1250	ENDDO
1251	ENDDO
1252
1253	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
1254
1255	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'end' )
1256
1257	END SUBROUTINE nesting_offl_mass_conservation
1258
1259
1260	!------------------------------------------------------------------------------!
1261	! Description:
1262	! ------------
1263	!> Set the lateral and top boundary conditions in case the PALM domain is
1264	!> nested offline in a mesoscale model. Further, average boundary data and
1265	!> determine mean profiles, further used for correct damping in the sponge
1266	!> layer.
1267	!------------------------------------------------------------------------------!
1268	SUBROUTINE nesting_offl_bc
1269
1270	USE exchange_horiz_mod, &
1271	ONLY: exchange_horiz
1272
1273	INTEGER(iwp) :: i !< running index x-direction
1274	INTEGER(iwp) :: j !< running index y-direction
1275	INTEGER(iwp) :: k !< running index z-direction
1276	INTEGER(iwp) :: n !< running index for chemical species
1277
1278	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref !< reference profile for potential temperature
1279	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref_l !< reference profile for potential temperature on subdomain
1280	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref !< reference profile for mixing ratio
1281	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref_l !< reference profile for mixing ratio on subdomain
1282	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref !< reference profile for u-component
1283	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref_l !< reference profile for u-component on subdomain
1284	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref !< reference profile for v-component
1285	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref_l !< reference profile for v-component on subdomain
1286	REAL(wp), DIMENSION(nzb:nzt+1) :: var_1d !< pre-interpolated profile for LOD1 mode
1287
1288	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem !< reference profile for chemical species
1289	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem_l !< reference profile for chemical species on subdomain
1290
1291	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'start' )
1292
1293	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
1294	!
1295	!-- Initialize mean profiles, derived from boundary data, to zero.
1296	pt_ref = 0.0_wp
1297	q_ref = 0.0_wp
1298	u_ref = 0.0_wp
1299	v_ref = 0.0_wp
1300
1301	pt_ref_l = 0.0_wp
1302	q_ref_l = 0.0_wp
1303	u_ref_l = 0.0_wp
1304	v_ref_l = 0.0_wp
1305	!
1306	!-- If required, allocate temporary arrays to compute chemistry mean profiles
1307	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1308	ALLOCATE( ref_chem(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
1309	ALLOCATE( ref_chem_l(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
1310	ref_chem = 0.0_wp
1311	ref_chem_l = 0.0_wp
1312	ENDIF
1313	!
1314	!-- Set boundary conditions of u-, v-, w-component, as well as q, and pt.
1315	!-- Note, boundary values at the left boundary: i=-1 (v,w,pt,q) and
1316	!-- i=0 (u), at the right boundary: i=nxr+1 (all), at the south boundary:
1317	!-- j=-1 (u,w,pt,q) and j=0 (v), at the north boundary: j=nyn+1 (all).
1318	!-- Please note, at the left (for u) and south (for v) boundary, values
1319	!-- for u and v are set also at i/j=-1, since these values are used in
1320	!-- boundary_conditions() to restore prognostic values.
1321	!-- Further, sum up data to calculate mean profiles from boundary data,
1322	!-- used for Rayleigh damping.
1323	IF ( bc_dirichlet_l ) THEN
1324	!
1325	!-- u-component
1326	IF ( lod == 2 ) THEN
1327	DO j = nys, nyn
1328	DO k = nzb+1, nzt
1329	u(k,j,i_bound_u) = interpolate_in_time( nest_offl%u_l(0,k,j), &
1330	nest_offl%u_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_u), 1 ) )
1334	ENDDO
1335	u(:,j,i_bound_u-1) = u(:,j,i_bound_u)
1336	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1337	ENDDO
1338	ELSE
1339	!
1340	!-- Pre-interpolate profile before mapping onto the boundaries.
1341	DO k = nzb+1, nzt
1342	var_1d(k) = interpolate_in_time( nest_offl%u_l(0,k,1), &
1343	nest_offl%u_l(1,k,1), &
1344	fac_dt )
1345	ENDDO
1346	DO j = nys, nyn
1347	u(nzb+1:nzt,j,i_bound_u) = var_1d(nzb+1:nzt) * &
1348	MERGE( 1.0_wp, 0.0_wp, &
1349	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound_u), 1 ) )
1350	u(:,j,i_bound_u-1) = u(:,j,i_bound_u)
1351	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1352	ENDDO
1353	ENDIF
1354	!
1355	!-- w-component
1356	IF ( lod == 2 ) THEN
1357	DO j = nys, nyn
1358	DO k = nzb+1, nzt-1
1359	w(k,j,i_bound) = interpolate_in_time( nest_offl%w_l(0,k,j), &
1360	nest_offl%w_l(1,k,j), &
1361	fac_dt ) * &
1362	MERGE( 1.0_wp, 0.0_wp, &
1363	BTEST( wall_flags_total_0(k,j,i_bound), 3 ) )
1364	ENDDO
1365	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1366	ENDDO
1367	ELSE
1368	DO k = nzb+1, nzt-1
1369	var_1d(k) = interpolate_in_time( nest_offl%w_l(0,k,1), &
1370	nest_offl%w_l(1,k,1), &
1371	fac_dt )
1372	ENDDO
1373	DO j = nys, nyn
1374	w(nzb+1:nzt-1,j,i_bound) = var_1d(nzb+1:nzt-1) * &
1375	MERGE( 1.0_wp, 0.0_wp, &
1376	BTEST( wall_flags_total_0(nzb+1:nzt-1,j,i_bound), 3 ) )
1377	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1378	ENDDO
1379	ENDIF
1380	!
1381	!-- v-component
1382	IF ( lod == 2 ) THEN
1383	DO j = nysv, nyn
1384	DO k = nzb+1, nzt
1385	v(k,j,i_bound) = interpolate_in_time( nest_offl%v_l(0,k,j), &
1386	nest_offl%v_l(1,k,j), &
1387	fac_dt ) * &
1388	MERGE( 1.0_wp, 0.0_wp, &
1389	BTEST( wall_flags_total_0(k,j,i_bound), 2 ) )
1390	ENDDO
1391	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1392	ENDDO
1393	ELSE
1394	DO k = nzb+1, nzt
1395	var_1d(k) = interpolate_in_time( nest_offl%v_l(0,k,1), &
1396	nest_offl%v_l(1,k,1), &
1397	fac_dt )
1398	ENDDO
1399	DO j = nysv, nyn
1400	v(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt) * &
1401	MERGE( 1.0_wp, 0.0_wp, &
1402	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound), 2 ) )
1403	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1404	ENDDO
1405	ENDIF
1406	!
1407	!-- potential temperature
1408	IF ( .NOT. neutral ) THEN
1409	IF ( lod == 2 ) THEN
1410	DO j = nys, nyn
1411	DO k = nzb+1, nzt
1412	pt(k,j,i_bound) = interpolate_in_time( nest_offl%pt_l(0,k,j), &
1413	nest_offl%pt_l(1,k,j), &
1414	fac_dt )
1415	ENDDO
1416	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1417	ENDDO
1418	ELSE
1419	DO k = nzb+1, nzt
1420	var_1d(k) = interpolate_in_time( nest_offl%pt_l(0,k,1), &
1421	nest_offl%pt_l(1,k,1), &
1422	fac_dt )
1423	ENDDO
1424	DO j = nys, nyn
1425	pt(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1426	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1427	ENDDO
1428	ENDIF
1429	ENDIF
1430	!
1431	!-- humidity
1432	IF ( humidity ) THEN
1433	IF ( lod == 2 ) THEN
1434	DO j = nys, nyn
1435	DO k = nzb+1, nzt
1436	q(k,j,i_bound) = interpolate_in_time( nest_offl%q_l(0,k,j), &
1437	nest_offl%q_l(1,k,j), &
1438	fac_dt )
1439	ENDDO
1440	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1441	ENDDO
1442	ELSE
1443	DO k = nzb+1, nzt
1444	var_1d(k) = interpolate_in_time( nest_offl%q_l(0,k,1), &
1445	nest_offl%q_l(1,k,1), &
1446	fac_dt )
1447	ENDDO
1448	DO j = nys, nyn
1449	q(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1450	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1451	ENDDO
1452	ENDIF
1453	ENDIF
1454	!
1455	!-- chemistry
1456	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1457	DO n = 1, UBOUND( chem_species, 1 )
1458	IF ( nest_offl%chem_from_file_l(n) ) THEN
1459	IF ( lod == 2 ) THEN
1460	DO j = nys, nyn
1461	DO k = nzb+1, nzt
1462	chem_species(n)%conc(k,j,i_bound) = interpolate_in_time( &
1463	nest_offl%chem_l(0,k,j,n), &
1464	nest_offl%chem_l(1,k,j,n), &
1465	fac_dt )
1466	ENDDO
1467	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1468	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1469	ENDDO
1470	ELSE
1471	DO k = nzb+1, nzt
1472	var_1d(k) = interpolate_in_time( nest_offl%chem_l(0,k,1,n), &
1473	nest_offl%chem_l(1,k,1,n), &
1474	fac_dt )
1475	ENDDO
1476	DO j = nys, nyn
1477	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1478	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1479	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1480	ENDDO
1481	ENDIF
1482	ENDIF
1483	ENDDO
1484	ENDIF
1485
1486	ENDIF
1487
1488	IF ( bc_dirichlet_r ) THEN
1489	!
1490	!-- u-component
1491	IF ( lod == 2 ) THEN
1492	DO j = nys, nyn
1493	DO k = nzb+1, nzt
1494	u(k,j,i_bound_u) = interpolate_in_time( nest_offl%u_r(0,k,j), &
1495	nest_offl%u_r(1,k,j), &
1496	fac_dt ) * &
1497	MERGE( 1.0_wp, 0.0_wp, &
1498	BTEST( wall_flags_total_0(k,j,i_bound_u), 1 ) )
1499	ENDDO
1500	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1501	ENDDO
1502	ELSE
1503	DO k = nzb+1, nzt
1504	var_1d(k) = interpolate_in_time( nest_offl%u_r(0,k,1), &
1505	nest_offl%u_r(1,k,1), &
1506	fac_dt )
1507	ENDDO
1508	DO j = nys, nyn
1509	u(nzb+1:nzt,j,i_bound_u) = var_1d(nzb+1:nzt) * &
1510	MERGE( 1.0_wp, 0.0_wp, &
1511	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound_u), 1 ) )
1512	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1513	ENDDO
1514	ENDIF
1515	!
1516	!-- w-component
1517	IF ( lod == 2 ) THEN
1518	DO j = nys, nyn
1519	DO k = nzb+1, nzt-1
1520	w(k,j,i_bound) = interpolate_in_time( nest_offl%w_r(0,k,j), &
1521	nest_offl%w_r(1,k,j), &
1522	fac_dt ) * &
1523	MERGE( 1.0_wp, 0.0_wp, &
1524	BTEST( wall_flags_total_0(k,j,i_bound), 3 ) )
1525	ENDDO
1526	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1527	ENDDO
1528	ELSE
1529	DO k = nzb+1, nzt-1
1530	var_1d(k) = interpolate_in_time( nest_offl%w_r(0,k,1), &
1531	nest_offl%w_r(1,k,1), &
1532	fac_dt )
1533	ENDDO
1534	DO j = nys, nyn
1535	w(nzb+1:nzt-1,j,i_bound) = var_1d(nzb+1:nzt-1) * &
1536	MERGE( 1.0_wp, 0.0_wp, &
1537	BTEST( wall_flags_total_0(nzb+1:nzt-1,j,i_bound), 3 ) )
1538	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1539	ENDDO
1540	ENDIF
1541	!
1542	!-- v-component
1543	IF ( lod == 2 ) THEN
1544	DO j = nysv, nyn
1545	DO k = nzb+1, nzt
1546	v(k,j,i_bound) = interpolate_in_time( nest_offl%v_r(0,k,j), &
1547	nest_offl%v_r(1,k,j), &
1548	fac_dt ) * &
1549	MERGE( 1.0_wp, 0.0_wp, &
1550	BTEST( wall_flags_total_0(k,j,i_bound), 2 ) )
1551	ENDDO
1552	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1553	ENDDO
1554	ELSE
1555	DO k = nzb+1, nzt
1556	var_1d(k) = interpolate_in_time( nest_offl%v_r(0,k,1), &
1557	nest_offl%v_r(1,k,1), &
1558	fac_dt )
1559	ENDDO
1560	DO j = nysv, nyn
1561	v(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt) * &
1562	MERGE( 1.0_wp, 0.0_wp, &
1563	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound), 2 ) )
1564	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1565	ENDDO
1566	ENDIF
1567	!
1568	!-- potential temperature
1569	IF ( .NOT. neutral ) THEN
1570	IF ( lod == 2 ) THEN
1571	DO j = nys, nyn
1572	DO k = nzb+1, nzt
1573	pt(k,j,i_bound) = interpolate_in_time( nest_offl%pt_r(0,k,j), &
1574	nest_offl%pt_r(1,k,j), &
1575	fac_dt )
1576	ENDDO
1577	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1578	ENDDO
1579	ELSE
1580	DO k = nzb+1, nzt
1581	var_1d(k) = interpolate_in_time( nest_offl%pt_r(0,k,1), &
1582	nest_offl%pt_r(1,k,1), &
1583	fac_dt )
1584	ENDDO
1585	DO j = nys, nyn
1586	pt(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1587	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1588	ENDDO
1589	ENDIF
1590	ENDIF
1591	!
1592	!-- humidity
1593	IF ( humidity ) THEN
1594	IF ( lod == 2 ) THEN
1595	DO j = nys, nyn
1596	DO k = nzb+1, nzt
1597	q(k,j,i_bound) = interpolate_in_time( nest_offl%q_r(0,k,j), &
1598	nest_offl%q_r(1,k,j), &
1599	fac_dt )
1600	ENDDO
1601	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1602	ENDDO
1603	ELSE
1604	DO k = nzb+1, nzt
1605	var_1d(k) = interpolate_in_time( nest_offl%q_r(0,k,1), &
1606	nest_offl%q_r(1,k,1), &
1607	fac_dt )
1608	ENDDO
1609	DO j = nys, nyn
1610	q(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1611	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1612	ENDDO
1613	ENDIF
1614	ENDIF
1615	!
1616	!-- chemistry
1617	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1618	DO n = 1, UBOUND( chem_species, 1 )
1619	IF ( nest_offl%chem_from_file_r(n) ) THEN
1620	IF ( lod == 2 ) THEN
1621	DO j = nys, nyn
1622	DO k = nzb+1, nzt
1623	chem_species(n)%conc(k,j,i_bound) = interpolate_in_time( &
1624	nest_offl%chem_r(0,k,j,n), &
1625	nest_offl%chem_r(1,k,j,n), &
1626	fac_dt )
1627	ENDDO
1628	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1629	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1630	ENDDO
1631	ELSE
1632	DO k = nzb+1, nzt
1633	var_1d(k) = interpolate_in_time( nest_offl%chem_r(0,k,1,n), &
1634	nest_offl%chem_r(1,k,1,n), &
1635	fac_dt )
1636	ENDDO
1637	DO j = nys, nyn
1638	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1639	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1640	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1641	ENDDO
1642	ENDIF
1643	ENDIF
1644	ENDDO
1645	ENDIF
1646
1647	ENDIF
1648
1649	IF ( bc_dirichlet_n ) THEN
1650	!
1651	!-- v-component
1652	IF ( lod == 2 ) THEN
1653	DO i = nxl, nxr
1654	DO k = nzb+1, nzt
1655	v(k,j_bound_v,i) = interpolate_in_time( nest_offl%v_n(0,k,i), &
1656	nest_offl%v_n(1,k,i), &
1657	fac_dt ) * &
1658	MERGE( 1.0_wp, 0.0_wp, &
1659	BTEST( wall_flags_total_0(k,j_bound_v,i), 2 ) )
1660	ENDDO
1661	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1662	ENDDO
1663	ELSE
1664	DO k = nzb+1, nzt
1665	var_1d(k) = interpolate_in_time( nest_offl%v_n(0,k,1), &
1666	nest_offl%v_n(1,k,1), &
1667	fac_dt )
1668	ENDDO
1669	DO i = nxl, nxr
1670	v(nzb+1:nzt,j_bound_v,i) = var_1d(nzb+1:nzt) * &
1671	MERGE( 1.0_wp, 0.0_wp, &
1672	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound_v,i), 2 ) )
1673	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1674	ENDDO
1675	ENDIF
1676	!
1677	!-- w-component
1678	IF ( lod == 2 ) THEN
1679	DO i = nxl, nxr
1680	DO k = nzb+1, nzt-1
1681	w(k,j_bound,i) = interpolate_in_time( nest_offl%w_n(0,k,i), &
1682	nest_offl%w_n(1,k,i), &
1683	fac_dt ) * &
1684	MERGE( 1.0_wp, 0.0_wp, &
1685	BTEST( wall_flags_total_0(k,j_bound,i), 3 ) )
1686	ENDDO
1687	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1688	ENDDO
1689	ELSE
1690	DO k = nzb+1, nzt-1
1691	var_1d(k) = interpolate_in_time( nest_offl%w_n(0,k,1), &
1692	nest_offl%w_n(1,k,1), &
1693	fac_dt )
1694	ENDDO
1695	DO i = nxl, nxr
1696	w(nzb+1:nzt-1,j_bound,i) = var_1d(nzb+1:nzt-1) * &
1697	MERGE( 1.0_wp, 0.0_wp, &
1698	BTEST( wall_flags_total_0(nzb+1:nzt-1,j_bound,i), 3 ) )
1699	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1700	ENDDO
1701	ENDIF
1702	!
1703	!-- u-component
1704	IF ( lod == 2 ) THEN
1705	DO i = nxlu, nxr
1706	DO k = nzb+1, nzt
1707	u(k,j_bound,i) = interpolate_in_time( nest_offl%u_n(0,k,i), &
1708	nest_offl%u_n(1,k,i), &
1709	fac_dt ) * &
1710	MERGE( 1.0_wp, 0.0_wp, &
1711	BTEST( wall_flags_total_0(k,j_bound,i), 1 ) )
1712	ENDDO
1713	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1714	ENDDO
1715	ELSE
1716	DO k = nzb+1, nzt
1717	var_1d(k) = interpolate_in_time( nest_offl%u_n(0,k,1), &
1718	nest_offl%u_n(1,k,1), &
1719	fac_dt )
1720	ENDDO
1721	DO i = nxlu, nxr
1722	u(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt) * &
1723	MERGE( 1.0_wp, 0.0_wp, &
1724	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound,i), 1 ) )
1725	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1726	ENDDO
1727	ENDIF
1728	!
1729	!-- potential temperature
1730	IF ( .NOT. neutral ) THEN
1731	IF ( lod == 2 ) THEN
1732	DO i = nxl, nxr
1733	DO k = nzb+1, nzt
1734	pt(k,j_bound,i) = interpolate_in_time( nest_offl%pt_n(0,k,i), &
1735	nest_offl%pt_n(1,k,i), &
1736	fac_dt )
1737	ENDDO
1738	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1739	ENDDO
1740	ELSE
1741	DO k = nzb+1, nzt
1742	var_1d(k) = interpolate_in_time( nest_offl%pt_n(0,k,1), &
1743	nest_offl%pt_n(1,k,1), &
1744	fac_dt )
1745	ENDDO
1746	DO i = nxl, nxr
1747	pt(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1748	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1749	ENDDO
1750	ENDIF
1751	ENDIF
1752	!
1753	!-- humidity
1754	IF ( humidity ) THEN
1755	IF ( lod == 2 ) THEN
1756	DO i = nxl, nxr
1757	DO k = nzb+1, nzt
1758	q(k,j_bound,i) = interpolate_in_time( nest_offl%q_n(0,k,i), &
1759	nest_offl%q_n(1,k,i), &
1760	fac_dt )
1761	ENDDO
1762	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1763	ENDDO
1764	ELSE
1765	DO k = nzb+1, nzt
1766	var_1d(k) = interpolate_in_time( nest_offl%q_n(0,k,1), &
1767	nest_offl%q_n(1,k,1), &
1768	fac_dt )
1769	ENDDO
1770	DO i = nxl, nxr
1771	q(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1772	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1773	ENDDO
1774	ENDIF
1775	ENDIF
1776	!
1777	!-- chemistry
1778	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1779	DO n = 1, UBOUND( chem_species, 1 )
1780	IF ( nest_offl%chem_from_file_n(n) ) THEN
1781	IF ( lod == 2 ) THEN
1782	DO i = nxl, nxr
1783	DO k = nzb+1, nzt
1784	chem_species(n)%conc(k,j_bound,i) = interpolate_in_time( &
1785	nest_offl%chem_n(0,k,i,n), &
1786	nest_offl%chem_n(1,k,i,n), &
1787	fac_dt )
1788	ENDDO
1789	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1790	+ chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1791	ENDDO
1792	ELSE
1793	DO k = nzb+1, nzt
1794	var_1d(k) = interpolate_in_time( nest_offl%chem_n(0,k,1,n), &
1795	nest_offl%chem_n(1,k,1,n), &
1796	fac_dt )
1797	ENDDO
1798	DO i = nxl, nxr
1799	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1800	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) + &
1801	chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1802	ENDDO
1803	ENDIF
1804	ENDIF
1805	ENDDO
1806	ENDIF
1807	ENDIF
1808
1809	IF ( bc_dirichlet_s ) THEN
1810	!
1811	!-- v-component
1812	IF ( lod == 2 ) THEN
1813	DO i = nxl, nxr
1814	DO k = nzb+1, nzt
1815	v(k,j_bound_v,i) = interpolate_in_time( nest_offl%v_s(0,k,i), &
1816	nest_offl%v_s(1,k,i), &
1817	fac_dt ) * &
1818	MERGE( 1.0_wp, 0.0_wp, &
1819	BTEST( wall_flags_total_0(k,j_bound_v,i), 2 ) )
1820	ENDDO
1821	v(:,j_bound_v-1,i) = v(:,j_bound_v,i)
1822	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1823	ENDDO
1824	ELSE
1825	DO k = nzb+1, nzt
1826	var_1d(k) = interpolate_in_time( nest_offl%v_s(0,k,1), &
1827	nest_offl%v_s(1,k,1), &
1828	fac_dt )
1829	ENDDO
1830	DO i = nxl, nxr
1831	v(nzb+1:nzt,j_bound_v,i) = var_1d(nzb+1:nzt) * &
1832	MERGE( 1.0_wp, 0.0_wp, &
1833	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound_v,i), 2 ) )
1834	v(:,j_bound_v-1,i) = v(:,j_bound_v,i)
1835	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1836	ENDDO
1837	ENDIF
1838	!
1839	!-- w-component
1840	IF ( lod == 2 ) THEN
1841	DO i = nxl, nxr
1842	DO k = nzb+1, nzt-1
1843	w(k,j_bound,i) = interpolate_in_time( nest_offl%w_s(0,k,i), &
1844	nest_offl%w_s(1,k,i), &
1845	fac_dt ) * &
1846	MERGE( 1.0_wp, 0.0_wp, &
1847	BTEST( wall_flags_total_0(k,j_bound,i), 3 ) )
1848	ENDDO
1849	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1850	ENDDO
1851	ELSE
1852	DO k = nzb+1, nzt-1
1853	var_1d(k) = interpolate_in_time( nest_offl%w_s(0,k,1), &
1854	nest_offl%w_s(1,k,1), &
1855	fac_dt )
1856	ENDDO
1857	DO i = nxl, nxr
1858	w(nzb+1:nzt-1,j_bound,i) = var_1d(nzb+1:nzt-1) * &
1859	MERGE( 1.0_wp, 0.0_wp, &
1860	BTEST( wall_flags_total_0(nzb+1:nzt-1,j_bound,i), 3 ) )
1861	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1862	ENDDO
1863	ENDIF
1864	!
1865	!-- u-component
1866	IF ( lod == 2 ) THEN
1867	DO i = nxlu, nxr
1868	DO k = nzb+1, nzt
1869	u(k,j_bound,i) = interpolate_in_time( nest_offl%u_s(0,k,i), &
1870	nest_offl%u_s(1,k,i), &
1871	fac_dt ) * &
1872	MERGE( 1.0_wp, 0.0_wp, &
1873	BTEST( wall_flags_total_0(k,j_bound,i), 1 ) )
1874	ENDDO
1875	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1876	ENDDO
1877	ELSE
1878	DO k = nzb+1, nzt
1879	var_1d(k) = interpolate_in_time( nest_offl%u_s(0,k,1), &
1880	nest_offl%u_s(1,k,1), &
1881	fac_dt )
1882	ENDDO
1883	DO i = nxlu, nxr
1884	u(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt) * &
1885	MERGE( 1.0_wp, 0.0_wp, &
1886	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound,i), 1 ) )
1887	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1888	ENDDO
1889	ENDIF
1890	!
1891	!-- potential temperature
1892	IF ( .NOT. neutral ) THEN
1893	IF ( lod == 2 ) THEN
1894	DO i = nxl, nxr
1895	DO k = nzb+1, nzt
1896	pt(k,j_bound,i) = interpolate_in_time( nest_offl%pt_s(0,k,i), &
1897	nest_offl%pt_s(1,k,i), &
1898	fac_dt )
1899	ENDDO
1900	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1901	ENDDO
1902	ELSE
1903	DO k = nzb+1, nzt
1904	var_1d(k) = interpolate_in_time( nest_offl%pt_s(0,k,1), &
1905	nest_offl%pt_s(1,k,1), &
1906	fac_dt )
1907	ENDDO
1908	DO i = nxl, nxr
1909	pt(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1910	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1911	ENDDO
1912	ENDIF
1913	ENDIF
1914	!
1915	!-- humidity
1916	IF ( humidity ) THEN
1917	IF ( lod == 2 ) THEN
1918	DO i = nxl, nxr
1919	DO k = nzb+1, nzt
1920	q(k,j_bound,i) = interpolate_in_time( nest_offl%q_s(0,k,i), &
1921	nest_offl%q_s(1,k,i), &
1922	fac_dt )
1923	ENDDO
1924	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1925	ENDDO
1926	ELSE
1927	DO k = nzb+1, nzt
1928	var_1d(k) = interpolate_in_time( nest_offl%q_s(0,k,1), &
1929	nest_offl%q_s(1,k,1), &
1930	fac_dt )
1931	ENDDO
1932	DO i = nxl, nxr
1933	q(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1934	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1935	ENDDO
1936	ENDIF
1937	ENDIF
1938	!
1939	!-- chemistry
1940	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1941	DO n = 1, UBOUND( chem_species, 1 )
1942	IF ( nest_offl%chem_from_file_s(n) ) THEN
1943	IF ( lod == 2 ) THEN
1944	DO i = nxl, nxr
1945	DO k = nzb+1, nzt
1946	chem_species(n)%conc(k,j_bound,i) = interpolate_in_time( &
1947	nest_offl%chem_s(0,k,i,n), &
1948	nest_offl%chem_s(1,k,i,n), &
1949	fac_dt )
1950	ENDDO
1951	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1952	+ chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1953	ENDDO
1954	ELSE
1955	DO k = nzb+1, nzt
1956	var_1d(k) = interpolate_in_time( nest_offl%chem_s(0,k,1,n), &
1957	nest_offl%chem_s(1,k,1,n), &
1958	fac_dt )
1959	ENDDO
1960	DO i = nxl, nxr
1961	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1962	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) + &
1963	chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1964	ENDDO
1965	ENDIF
1966	ENDIF
1967	ENDDO
1968	ENDIF
1969	ENDIF
1970	!
1971	!-- Top boundary
1972	!-- u-component
1973	IF ( lod == 2 ) THEN
1974	DO i = nxlu, nxr
1975	DO j = nys, nyn
1976	u(nzt+1,j,i) = interpolate_in_time( nest_offl%u_top(0,j,i), &
1977	nest_offl%u_top(1,j,i), &
1978	fac_dt ) * &
1979	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt+1,j,i), 1 ) )
1980	u_ref_l(nzt+1) = u_ref_l(nzt+1) + u(nzt+1,j,i)
1981	ENDDO
1982	ENDDO
1983	ELSE
1984	var_1d(nzt+1) = interpolate_in_time( nest_offl%u_top(0,1,1), &
1985	nest_offl%u_top(1,1,1), &
1986	fac_dt )
1987	u(nzt+1,nys:nyn,nxlu:nxr) = var_1d(nzt+1) * &
1988	MERGE( 1.0_wp, 0.0_wp, &
1989	BTEST( wall_flags_total_0(nzt+1,nys:nyn,nxlu:nxr), 1 ) )
1990	u_ref_l(nzt+1) = u_ref_l(nzt+1) + SUM( u(nzt+1,nys:nyn,nxlu:nxr) )
1991	ENDIF
1992	!
1993	!-- For left boundary set boundary condition for u-component also at top
1994	!-- grid point.
1995	!-- Note, this has no effect on the numeric solution, only for data output.
1996	IF ( bc_dirichlet_l ) u(nzt+1,:,nxl) = u(nzt+1,:,nxlu)
1997	!
1998	!-- v-component
1999	IF ( lod == 2 ) THEN
2000	DO i = nxl, nxr
2001	DO j = nysv, nyn
2002	v(nzt+1,j,i) = interpolate_in_time( nest_offl%v_top(0,j,i), &
2003	nest_offl%v_top(1,j,i), &
2004	fac_dt ) * &
2005	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt+1,j,i), 2 ) )
2006	v_ref_l(nzt+1) = v_ref_l(nzt+1) + v(nzt+1,j,i)
2007	ENDDO
2008	ENDDO
2009	ELSE
2010	var_1d(nzt+1) = interpolate_in_time( nest_offl%v_top(0,1,1), &
2011	nest_offl%v_top(1,1,1), &
2012	fac_dt )
2013	v(nzt+1,nysv:nyn,nxl:nxr) = var_1d(nzt+1) * &
2014	MERGE( 1.0_wp, 0.0_wp, &
2015	BTEST( wall_flags_total_0(nzt+1,nysv:nyn,nxl:nxr), 2 ) )
2016	v_ref_l(nzt+1) = v_ref_l(nzt+1) + SUM( v(nzt+1,nysv:nyn,nxl:nxr) )
2017	ENDIF
2018	!
2019	!-- For south boundary set boundary condition for v-component also at top
2020	!-- grid point.
2021	!-- Note, this has no effect on the numeric solution, only for data output.
2022	IF ( bc_dirichlet_s ) v(nzt+1,nys,:) = v(nzt+1,nysv,:)
2023	!
2024	!-- w-component
2025	IF ( lod == 2 ) THEN
2026	DO i = nxl, nxr
2027	DO j = nys, nyn
2028	w(nzt,j,i) = interpolate_in_time( nest_offl%w_top(0,j,i), &
2029	nest_offl%w_top(1,j,i), &
2030	fac_dt ) * &
2031	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt,j,i), 3 ) )
2032	w(nzt+1,j,i) = w(nzt,j,i)
2033	ENDDO
2034	ENDDO
2035	ELSE
2036	var_1d(nzt) = interpolate_in_time( nest_offl%w_top(0,1,1), &
2037	nest_offl%w_top(1,1,1), &
2038	fac_dt )
2039	w(nzt,nys:nyn,nxl:nxr) = var_1d(nzt) * &
2040	MERGE( 1.0_wp, 0.0_wp, &
2041	BTEST( wall_flags_total_0(nzt,nys:nyn,nxl:nxr), 3 ) )
2042	w(nzt+1,nys:nyn,nxl:nxr) = w(nzt,nys:nyn,nxl:nxr)
2043	ENDIF
2044	!
2045	!-- potential temperture
2046	IF ( .NOT. neutral ) THEN
2047	IF ( lod == 2 ) THEN
2048	DO i = nxl, nxr
2049	DO j = nys, nyn
2050	pt(nzt+1,j,i) = interpolate_in_time( nest_offl%pt_top(0,j,i), &
2051	nest_offl%pt_top(1,j,i), &
2052	fac_dt )
2053	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + pt(nzt+1,j,i)
2054	ENDDO
2055	ENDDO
2056	ELSE
2057	var_1d(nzt+1) = interpolate_in_time( nest_offl%pt_top(0,1,1), &
2058	nest_offl%pt_top(1,1,1), &
2059	fac_dt )
2060	pt(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2061	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + SUM( pt(nzt+1,nys:nyn,nxl:nxr) )
2062	ENDIF
2063	ENDIF
2064	!
2065	!-- humidity
2066	IF ( humidity ) THEN
2067	IF ( lod == 2 ) THEN
2068	DO i = nxl, nxr
2069	DO j = nys, nyn
2070	q(nzt+1,j,i) = interpolate_in_time( nest_offl%q_top(0,j,i), &
2071	nest_offl%q_top(1,j,i), &
2072	fac_dt )
2073	q_ref_l(nzt+1) = q_ref_l(nzt+1) + q(nzt+1,j,i)
2074	ENDDO
2075	ENDDO
2076	ELSE
2077	var_1d(nzt+1) = interpolate_in_time( nest_offl%q_top(0,1,1), &
2078	nest_offl%q_top(1,1,1), &
2079	fac_dt )
2080	q(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2081	q_ref_l(nzt+1) = q_ref_l(nzt+1) + SUM( q(nzt+1,nys:nyn,nxl:nxr) )
2082	ENDIF
2083	ENDIF
2084
2085	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2086	DO n = 1, UBOUND( chem_species, 1 )
2087	IF ( nest_offl%chem_from_file_t(n) ) THEN
2088	IF ( lod == 2 ) THEN
2089	DO i = nxl, nxr
2090	DO j = nys, nyn
2091	chem_species(n)%conc(nzt+1,j,i) = interpolate_in_time( &
2092	nest_offl%chem_top(0,j,i,n), &
2093	nest_offl%chem_top(1,j,i,n), &
2094	fac_dt )
2095	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + &
2096	chem_species(n)%conc(nzt+1,j,i)
2097	ENDDO
2098	ENDDO
2099	ELSE
2100	var_1d(nzt+1) = interpolate_in_time( nest_offl%chem_top(0,1,1,n), &
2101	nest_offl%chem_top(1,1,1,n), &
2102	fac_dt )
2103	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2104	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + &
2105	SUM( chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) )
2106	ENDIF
2107	ENDIF
2108	ENDDO
2109	ENDIF
2110	!
2111	!-- Moreover, set Neumann boundary condition for subgrid-scale TKE,
2112	!-- passive scalar, dissipation, and chemical species if required
2113	IF ( rans_mode .AND. rans_tke_e ) THEN
2114	IF ( bc_dirichlet_l ) diss(:,:,nxl-1) = diss(:,:,nxl)
2115	IF ( bc_dirichlet_r ) diss(:,:,nxr+1) = diss(:,:,nxr)
2116	IF ( bc_dirichlet_s ) diss(:,nys-1,:) = diss(:,nys,:)
2117	IF ( bc_dirichlet_n ) diss(:,nyn+1,:) = diss(:,nyn,:)
2118	ENDIF
2119	! IF ( .NOT. constant_diffusion ) THEN
2120	! IF ( bc_dirichlet_l ) e(:,:,nxl-1) = e(:,:,nxl)
2121	! IF ( bc_dirichlet_r ) e(:,:,nxr+1) = e(:,:,nxr)
2122	! IF ( bc_dirichlet_s ) e(:,nys-1,:) = e(:,nys,:)
2123	! IF ( bc_dirichlet_n ) e(:,nyn+1,:) = e(:,nyn,:)
2124	! e(nzt+1,:,:) = e(nzt,:,:)
2125	! ENDIF
2126	! IF ( passive_scalar ) THEN
2127	! IF ( bc_dirichlet_l ) s(:,:,nxl-1) = s(:,:,nxl)
2128	! IF ( bc_dirichlet_r ) s(:,:,nxr+1) = s(:,:,nxr)
2129	! IF ( bc_dirichlet_s ) s(:,nys-1,:) = s(:,nys,:)
2130	! IF ( bc_dirichlet_n ) s(:,nyn+1,:) = s(:,nyn,:)
2131	! ENDIF
2132
2133	CALL exchange_horiz( u, nbgp )
2134	CALL exchange_horiz( v, nbgp )
2135	CALL exchange_horiz( w, nbgp )
2136	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
2137	IF ( humidity ) CALL exchange_horiz( q, nbgp )
2138	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2139	DO n = 1, UBOUND( chem_species, 1 )
2140	!
2141	!-- Do local exchange only when necessary, i.e. when data is coming
2142	!-- from dynamic file.
2143	IF ( nest_offl%chem_from_file_t(n) ) CALL exchange_horiz( chem_species(n)%conc, nbgp )
2144	ENDDO
2145	ENDIF
2146	!
2147	!-- Set top boundary condition at all horizontal grid points, also at the
2148	!-- lateral boundary grid points.
2149	w(nzt+1,:,:) = w(nzt,:,:)
2150	!
2151	!-- Offline nesting for salsa
2152	IF ( salsa ) CALL salsa_nesting_offl_bc
2153	!
2154	!-- Calculate the mean profiles. These are later stored on u_init, v_init,
2155	!-- etc., in order to adjust the Rayleigh damping under time-evolving atmospheric conditions
2156	!-- accordingly - damping against the representative mean profiles, not against the initial
2157	!-- profiles. Note, in LOD = 1 case no averaging is required.
2158	#if defined( __parallel )
2159	CALL MPI_ALLREDUCE( u_ref_l, u_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2160	CALL MPI_ALLREDUCE( v_ref_l, v_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2161	IF ( humidity ) THEN
2162	CALL MPI_ALLREDUCE( q_ref_l, q_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2163	ENDIF
2164	IF ( .NOT. neutral ) THEN
2165	CALL MPI_ALLREDUCE( pt_ref_l, pt_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2166	ENDIF
2167	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2168	CALL MPI_ALLREDUCE( ref_chem_l, ref_chem, ( nzt+1-nzb+1 ) * SIZE( ref_chem(nzb,:) ), &
2169	MPI_REAL, MPI_SUM, comm2d, ierr )
2170	ENDIF
2171	#else
2172	u_ref = u_ref_l
2173	v_ref = v_ref_l
2174	IF ( humidity ) q_ref = q_ref_l
2175	IF ( .NOT. neutral ) pt_ref = pt_ref_l
2176	IF ( air_chemistry .AND. nesting_offline_chem ) ref_chem = ref_chem_l
2177	#endif
2178	!
2179	!-- Average data. Note, reference profiles up to nzt are derived from lateral
2180	!-- boundaries, at the model top it is derived from the top boundary. Thus,
2181	!-- number of input data is different from nzb:nzt compared to nzt+1.
2182	!-- Derived from lateral boundaries.
2183	u_ref(nzb:nzt) = u_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx ), KIND = wp )
2184	v_ref(nzb:nzt) = v_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + nx + 1 ), KIND = wp )
2185	IF ( humidity ) &
2186	q_ref(nzb:nzt) = q_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2187	IF ( .NOT. neutral ) &
2188	pt_ref(nzb:nzt) = pt_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2189	IF ( air_chemistry .AND. nesting_offline_chem ) &
2190	ref_chem(nzb:nzt,:) = ref_chem(nzb:nzt,:) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2191	!
2192	!-- Derived from top boundary.
2193	u_ref(nzt+1) = u_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx ), KIND = wp )
2194	v_ref(nzt+1) = v_ref(nzt+1) / REAL( ( ny ) * ( nx + 1 ), KIND = wp )
2195	IF ( humidity ) &
2196	q_ref(nzt+1) = q_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), KIND = wp )
2197	IF ( .NOT. neutral ) &
2198	pt_ref(nzt+1) = pt_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), KIND = wp )
2199	IF ( air_chemistry .AND. nesting_offline_chem ) &
2200	ref_chem(nzt+1,:) = ref_chem(nzt+1,:) / REAL( ( ny + 1 ) * ( nx + 1 ),KIND = wp )
2201	!
2202	!-- Write onto init profiles, which are used for damping. Also set lower
2203	!-- boundary condition for scalars (not required for u and v as these are
2204	!-- zero at k=nzb.
2205	u_init = u_ref
2206	v_init = v_ref
2207	IF ( humidity ) THEN
2208	q_init = q_ref
2209	q_init(nzb) = q_init(nzb+1)
2210	ENDIF
2211	IF ( .NOT. neutral ) THEN
2212	pt_init = pt_ref
2213	pt_init(nzb) = pt_init(nzb+1)
2214	ENDIF
2215
2216	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2217	DO n = 1, UBOUND( chem_species, 1 )
2218	IF ( nest_offl%chem_from_file_t(n) ) THEN
2219	chem_species(n)%conc_pr_init(:) = ref_chem(:,n)
2220	chem_species(n)%conc_pr_init(nzb) = chem_species(n)%conc_pr_init(nzb+1)
2221	ENDIF
2222	ENDDO
2223	ENDIF
2224	IF ( ALLOCATED( ref_chem ) ) DEALLOCATE( ref_chem )
2225	IF ( ALLOCATED( ref_chem_l ) ) DEALLOCATE( ref_chem_l )
2226	!
2227	!-- Further, adjust Rayleigh damping height in case of time-changing conditions.
2228	!-- Therefore, calculate boundary-layer depth first.
2229	CALL nesting_offl_calc_zi
2230	CALL adjust_sponge_layer
2231
2232	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
2233
2234	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'end' )
2235
2236
2237	END SUBROUTINE nesting_offl_bc
2238
2239	!------------------------------------------------------------------------------!
2240	! Description:
2241	!------------------------------------------------------------------------------!
2242	!> Update of the geostrophic wind components. Note, currently this routine is
2243	!> not invoked.
2244	!------------------------------------------------------------------------------!
2245	SUBROUTINE nesting_offl_geostrophic_wind
2246
2247	INTEGER(iwp) :: k
2248	!
2249	!-- Update geostrophic wind components from dynamic input file.
2250	DO k = nzb+1, nzt
2251	ug(k) = interpolate_in_time( nest_offl%ug(0,k), nest_offl%ug(1,k), &
2252	fac_dt )
2253	vg(k) = interpolate_in_time( nest_offl%vg(0,k), nest_offl%vg(1,k), &
2254	fac_dt )
2255	ENDDO
2256	ug(nzt+1) = ug(nzt)
2257	vg(nzt+1) = vg(nzt)
2258
2259	END SUBROUTINE nesting_offl_geostrophic_wind
2260
2261	!------------------------------------------------------------------------------!
2262	! Description:
2263	!------------------------------------------------------------------------------!
2264	!> Determine the interpolation constant for time interpolation. The
2265	!> calculation is separated from the nesting_offl_bc and
2266	!> nesting_offl_geostrophic_wind in order to be independent on the order
2267	!> of calls.
2268	!------------------------------------------------------------------------------!
2269	SUBROUTINE nesting_offl_interpolation_factor
2270	!
2271	!-- Determine interpolation factor and limit it to 1. This is because
2272	!-- t+dt can slightly exceed time(tind_p) before boundary data is updated
2273	!-- again.
2274	fac_dt = ( time_since_reference_point &
2275	- nest_offl%time(nest_offl%tind) + dt_3d ) / &
2276	( nest_offl%time(nest_offl%tind_p) - nest_offl%time(nest_offl%tind) )
2277
2278	fac_dt = MIN( 1.0_wp, fac_dt )
2279
2280	END SUBROUTINE nesting_offl_interpolation_factor
2281
2282	!------------------------------------------------------------------------------!
2283	! Description:
2284	!------------------------------------------------------------------------------!
2285	!> Calculates the boundary-layer depth from the boundary data, according to
2286	!> bulk-Richardson criterion.
2287	!------------------------------------------------------------------------------!
2288	SUBROUTINE nesting_offl_calc_zi
2289
2290	INTEGER(iwp) :: i !< loop index in x-direction
2291	INTEGER(iwp) :: j !< loop index in y-direction
2292	INTEGER(iwp) :: k !< loop index in z-direction
2293	INTEGER(iwp) :: k_max_loc !< index of maximum wind speed along z-direction
2294	INTEGER(iwp) :: k_surface !< topography top index in z-direction
2295	INTEGER(iwp) :: num_boundary_gp_non_cyclic !< number of non-cyclic boundaries, used for averaging ABL depth
2296	INTEGER(iwp) :: num_boundary_gp_non_cyclic_l !< number of non-cyclic boundaries, used for averaging ABL depth
2297
2298	REAL(wp) :: ri_bulk !< bulk Richardson number
2299	REAL(wp) :: ri_bulk_crit = 0.25_wp !< critical bulk Richardson number
2300	REAL(wp) :: topo_max !< maximum topography level in model domain
2301	REAL(wp) :: topo_max_l !< maximum topography level in subdomain
2302	REAL(wp) :: vpt_surface !< near-surface virtual potential temperature
2303	REAL(wp) :: zi_l !< mean boundary-layer depth on subdomain
2304	REAL(wp) :: zi_local !< local boundary-layer depth
2305
2306	REAL(wp), DIMENSION(nzb:nzt+1) :: vpt_col !< vertical profile of virtual potential temperature at (j,i)-grid point
2307	REAL(wp), DIMENSION(nzb:nzt+1) :: uv_abs !< vertical profile of horizontal wind speed at (j,i)-grid point
2308
2309
2310	!
2311	!-- Calculate mean boundary-layer height from boundary data.
2312	!-- Start with the left and right boundaries.
2313	zi_l = 0.0_wp
2314	num_boundary_gp_non_cyclic_l = 0
2315	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2316	!
2317	!-- Sum-up and store number of boundary grid points used for averaging
2318	!-- ABL depth
2319	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + &
2320	nxr - nxl + 1
2321	!
2322	!-- Determine index along x. Please note, index indicates boundary
2323	!-- grid point for scalars.
2324	i = MERGE( -1, nxr + 1, bc_dirichlet_l )
2325
2326	DO j = nys, nyn
2327	!
2328	!-- Determine topography top index at current (j,i) index
2329	k_surface = topo_top_ind(j,i,0)
2330	!
2331	!-- Pre-compute surface virtual temperature. Therefore, use 2nd
2332	!-- prognostic level according to Heinze et al. (2017).
2333	IF ( humidity ) THEN
2334	vpt_surface = pt(k_surface+2,j,i) * &
2335	( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
2336	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
2337	ELSE
2338	vpt_surface = pt(k_surface+2,j,i)
2339	vpt_col = pt(:,j,i)
2340	ENDIF
2341	!
2342	!-- Calculate local boundary layer height from bulk Richardson number,
2343	!-- i.e. the height where the bulk Richardson number exceeds its
2344	!-- critical value of 0.25 (according to Heinze et al., 2017).
2345	!-- Note, no interpolation of u- and v-component is made, as both
2346	!-- are mainly mean inflow profiles with very small spatial variation.
2347	!-- Add a safety factor in case the velocity term becomes zero. This
2348	!-- may happen if overhanging 3D structures are directly located at
2349	!-- the boundary, where velocity inside the building is zero
2350	!-- (k_surface is the index of the lowest upward-facing surface).
2351	uv_abs(:) = SQRT( MERGE( u(:,j,i+1), u(:,j,i), &
2352	bc_dirichlet_l )**2 + &
2353	v(:,j,i)**2 )
2354	!
2355	!-- Determine index of the maximum wind speed
2356	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
2357
2358	zi_local = 0.0_wp
2359	DO k = k_surface+1, nzt
2360	ri_bulk = zu(k) * g / vpt_surface * &
2361	( vpt_col(k) - vpt_surface ) / &
2362	( uv_abs(k) + 1E-5_wp )
2363	!
2364	!-- Check if critical Richardson number is exceeded. Further, check
2365	!-- if there is a maxium in the wind profile in order to detect also
2366	!-- ABL heights in the stable boundary layer.
2367	IF ( zi_local == 0.0_wp .AND. &
2368	( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
2369	zi_local = zu(k)
2370	ENDDO
2371	!
2372	!-- Assure that the minimum local boundary-layer depth is at least at
2373	!-- the second vertical grid level.
2374	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
2375
2376	ENDDO
2377
2378	ENDIF
2379	!
2380	!-- Do the same at the north and south boundaries.
2381	IF ( bc_dirichlet_s .OR. bc_dirichlet_n ) THEN
2382
2383	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + &
2384	nxr - nxl + 1
2385
2386	j = MERGE( -1, nyn + 1, bc_dirichlet_s )
2387
2388	DO i = nxl, nxr
2389	k_surface = topo_top_ind(j,i,0)
2390
2391	IF ( humidity ) THEN
2392	vpt_surface = pt(k_surface+2,j,i) * &
2393	( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
2394	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
2395	ELSE
2396	vpt_surface = pt(k_surface+2,j,i)
2397	vpt_col = pt(:,j,i)
2398	ENDIF
2399
2400	uv_abs(:) = SQRT( u(:,j,i)**2 + &
2401	MERGE( v(:,j+1,i), v(:,j,i), &
2402	bc_dirichlet_s )**2 )
2403	!
2404	!-- Determine index of the maximum wind speed
2405	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
2406
2407	zi_local = 0.0_wp
2408	DO k = k_surface+1, nzt
2409	ri_bulk = zu(k) * g / vpt_surface * &
2410	( vpt_col(k) - vpt_surface ) / &
2411	( uv_abs(k) + 1E-5_wp )
2412	!
2413	!-- Check if critical Richardson number is exceeded. Further, check
2414	!-- if there is a maxium in the wind profile in order to detect also
2415	!-- ABL heights in the stable boundary layer.
2416	IF ( zi_local == 0.0_wp .AND. &
2417	( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
2418	zi_local = zu(k)
2419	ENDDO
2420	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
2421
2422	ENDDO
2423
2424	ENDIF
2425
2426	#if defined( __parallel )
2427	CALL MPI_ALLREDUCE( zi_l, zi_ribulk, 1, MPI_REAL, MPI_SUM, &
2428	comm2d, ierr )
2429	CALL MPI_ALLREDUCE( num_boundary_gp_non_cyclic_l, &
2430	num_boundary_gp_non_cyclic, &
2431	1, MPI_INTEGER, MPI_SUM, comm2d, ierr )
2432	#else
2433	zi_ribulk = zi_l
2434	num_boundary_gp_non_cyclic = num_boundary_gp_non_cyclic_l
2435	#endif
2436	zi_ribulk = zi_ribulk / REAL( num_boundary_gp_non_cyclic, KIND = wp )
2437	!
2438	!-- Finally, check if boundary layer depth is not below the any topography.
2439	!-- zi_ribulk will be used to adjust rayleigh damping height, i.e. the
2440	!-- lower level of the sponge layer, as well as to adjust the synthetic
2441	!-- turbulence generator accordingly. If Rayleigh damping would be applied
2442	!-- near buildings, etc., this would spoil the simulation results.
2443	topo_max_l = zw(MAXVAL( topo_top_ind(nys:nyn,nxl:nxr,0) ))
2444
2445	#if defined( __parallel )
2446	CALL MPI_ALLREDUCE( topo_max_l, topo_max, 1, MPI_REAL, MPI_MAX, &
2447	comm2d, ierr )
2448	#else
2449	topo_max = topo_max_l
2450	#endif
2451	! zi_ribulk = MAX( zi_ribulk, topo_max )
2452
2453	END SUBROUTINE nesting_offl_calc_zi
2454
2455
2456	!------------------------------------------------------------------------------!
2457	! Description:
2458	!------------------------------------------------------------------------------!
2459	!> Adjust the height where the rayleigh damping starts, i.e. the lower level
2460	!> of the sponge layer.
2461	!------------------------------------------------------------------------------!
2462	SUBROUTINE adjust_sponge_layer
2463
2464	INTEGER(iwp) :: k !< loop index in z-direction
2465
2466	REAL(wp) :: rdh !< updated Rayleigh damping height
2467
2468
2469	IF ( rayleigh_damping_height > 0.0_wp .AND. &
2470	rayleigh_damping_factor > 0.0_wp ) THEN
2471	!
2472	!-- Update Rayleigh-damping height and re-calculate height-depending
2473	!-- damping coefficients.
2474	!-- Assure that rayleigh damping starts well above the boundary layer.
2475	rdh = MIN( MAX( zi_ribulk * 1.3_wp, 10.0_wp * dz(1) ), &
2476	0.8_wp * zu(nzt), rayleigh_damping_height )
2477	!
2478	!-- Update Rayleigh damping factor
2479	DO k = nzb+1, nzt
2480	IF ( zu(k) >= rdh ) THEN
2481	rdf(k) = rayleigh_damping_factor * &
2482	( SIN( pi * 0.5_wp * ( zu(k) - rdh ) &
2483	/ ( zu(nzt) - rdh ) ) &
2484	)**2
2485	ENDIF
2486	ENDDO
2487	rdf_sc = rdf
2488
2489	ENDIF
2490
2491	END SUBROUTINE adjust_sponge_layer
2492
2493	!------------------------------------------------------------------------------!
2494	! Description:
2495	! ------------
2496	!> Performs consistency checks
2497	!------------------------------------------------------------------------------!
2498	SUBROUTINE nesting_offl_check_parameters
2499	!
2500	!-- Check if offline nesting is applied in nested child domain.
2501	IF ( nesting_offline .AND. child_domain ) THEN
2502	message_string = 'Offline nesting is only applicable in root model.'
2503	CALL message( 'offline_nesting_check_parameters', 'PA0622', 1, 2, 0, 6, 0 )
2504	ENDIF
2505
2506	END SUBROUTINE nesting_offl_check_parameters
2507
2508	!------------------------------------------------------------------------------!
2509	! Description:
2510	! ------------
2511	!> Reads the parameter list nesting_offl_parameters
2512	!------------------------------------------------------------------------------!
2513	SUBROUTINE nesting_offl_parin
2514
2515	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
2516
2517
2518	NAMELIST /nesting_offl_parameters/ nesting_offline
2519
2520	line = ' '
2521
2522	!
2523	!-- Try to find stg package
2524	REWIND ( 11 )
2525	line = ' '
2526	DO WHILE ( INDEX( line, '&nesting_offl_parameters' ) == 0 )
2527	READ ( 11, '(A)', END=20 ) line
2528	ENDDO
2529	BACKSPACE ( 11 )
2530
2531	!
2532	!-- Read namelist
2533	READ ( 11, nesting_offl_parameters, ERR = 10, END = 20 )
2534
2535	GOTO 20
2536
2537	10 BACKSPACE( 11 )
2538	READ( 11 , '(A)') line
2539	CALL parin_fail_message( 'nesting_offl_parameters', line )
2540
2541	20 CONTINUE
2542
2543
2544	END SUBROUTINE nesting_offl_parin
2545
2546	!------------------------------------------------------------------------------!
2547	! Description:
2548	! ------------
2549	!> Writes information about offline nesting into HEADER file
2550	!------------------------------------------------------------------------------!
2551	SUBROUTINE nesting_offl_header ( io )
2552
2553	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
2554
2555	WRITE ( io, 1 )
2556	IF ( nesting_offline ) THEN
2557	WRITE ( io, 3 )
2558	ELSE
2559	WRITE ( io, 2 )
2560	ENDIF
2561
2562	1 FORMAT (//' Offline nesting in COSMO model:'/ &
2563	' -------------------------------'/)
2564	2 FORMAT (' --> No offlince nesting is used (default) ')
2565	3 FORMAT (' --> Offlince nesting is used. Boundary data is read from dynamic input file ')
2566
2567	END SUBROUTINE nesting_offl_header
2568
2569	!------------------------------------------------------------------------------!
2570	! Description:
2571	! ------------
2572	!> Allocate arrays used to read boundary data from NetCDF file and initialize
2573	!> boundary data.
2574	!------------------------------------------------------------------------------!
2575	SUBROUTINE nesting_offl_init
2576
2577	INTEGER(iwp) :: i !< loop index for x-direction
2578	INTEGER(iwp) :: j !< loop index for y-direction
2579	INTEGER(iwp) :: n !< running index for chemical species
2580
2581	!
2582	!-- Before arrays for the boundary data are allocated, the LOD of the dynamic input data
2583	!-- at the boundaries is read.
2584	#if defined ( __netcdf )
2585	!
2586	!-- Open file in read-only mode
2587	CALL open_read_file( TRIM( input_file_dynamic ) // TRIM( coupling_char ), pids_id )
2588	!
2589	!-- Read attributes for LOD. In order to gurantee that also older drivers, where attribute is not given,
2590	!-- are working, do not abort the run but assume LOD2 forcing.
2591	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_pt, .FALSE., 'ls_forcing_left_pt', .FALSE. )
2592	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_qv, .FALSE., 'ls_forcing_left_qv', .FALSE. )
2593	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_u, .FALSE., 'ls_forcing_left_u', .FALSE. )
2594	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_v, .FALSE., 'ls_forcing_left_v', .FALSE. )
2595	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_w, .FALSE., 'ls_forcing_left_w', .FALSE. )
2596
2597	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_pt, .FALSE., 'ls_forcing_north_pt', .FALSE. )
2598	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_qv, .FALSE., 'ls_forcing_north_qv', .FALSE. )
2599	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_u, .FALSE., 'ls_forcing_north_u', .FALSE. )
2600	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_v, .FALSE., 'ls_forcing_north_v', .FALSE. )
2601	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_w, .FALSE., 'ls_forcing_north_w', .FALSE. )
2602
2603	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_pt, .FALSE., 'ls_forcing_south_pt', .FALSE. )
2604	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_qv, .FALSE., 'ls_forcing_south_qv', .FALSE. )
2605	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_u, .FALSE., 'ls_forcing_south_u', .FALSE. )
2606	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_v, .FALSE., 'ls_forcing_south_v', .FALSE. )
2607	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_w, .FALSE., 'ls_forcing_south_w', .FALSE. )
2608
2609	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_pt, .FALSE., 'ls_forcing_right_pt', .FALSE. )
2610	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_qv, .FALSE., 'ls_forcing_right_qv', .FALSE. )
2611	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_u, .FALSE., 'ls_forcing_right_u', .FALSE. )
2612	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_v, .FALSE., 'ls_forcing_right_v', .FALSE. )
2613	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_w, .FALSE., 'ls_forcing_right_w', .FALSE. )
2614
2615	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_pt, .FALSE., 'ls_forcing_top_pt', .FALSE. )
2616	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_qv, .FALSE., 'ls_forcing_top_qv', .FALSE. )
2617	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_u, .FALSE., 'ls_forcing_top_u', .FALSE. )
2618	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_v, .FALSE., 'ls_forcing_top_v', .FALSE. )
2619	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_w, .FALSE., 'ls_forcing_top_w', .FALSE. )
2620
2621	CALL close_input_file( pids_id )
2622	#endif
2623	!
2624	!-- Temporary workaround until most of the dynamic drivers contain a LOD attribute. So far INIFOR
2625	!-- did not provide the LOD attribute. In order to still use these older dynamic drivers, provide
2626	!-- a temporary workaround. If the LOD is not given, a NetCDF interal error will occur but the simulation
2627	!-- will not be aborted since the no_abort flag is passed. However, the respective attribute value
2628	!-- might be given an arbitrary number. Hence, check for valid LOD's and manually set them to LOD 2
2629	!-- (as assumed so far). Note, this workaround should be removed later (date of reference: 6. Oct. 2020).
2630	IF ( nest_offl%lod_east_pt /= 1 .AND. nest_offl%lod_east_pt /= 2 ) nest_offl%lod_east_pt = 2
2631	IF ( nest_offl%lod_east_qv /= 1 .AND. nest_offl%lod_east_qv /= 2 ) nest_offl%lod_east_qv = 2
2632	IF ( nest_offl%lod_east_u /= 1 .AND. nest_offl%lod_east_u /= 2 ) nest_offl%lod_east_u = 2
2633	IF ( nest_offl%lod_east_v /= 1 .AND. nest_offl%lod_east_v /= 2 ) nest_offl%lod_east_v = 2
2634	IF ( nest_offl%lod_east_w /= 1 .AND. nest_offl%lod_east_w /= 2 ) nest_offl%lod_east_w = 2
2635
2636	IF ( nest_offl%lod_north_pt /= 1 .AND. nest_offl%lod_north_pt /= 2 ) nest_offl%lod_north_pt = 2
2637	IF ( nest_offl%lod_north_qv /= 1 .AND. nest_offl%lod_north_qv /= 2 ) nest_offl%lod_north_qv = 2
2638	IF ( nest_offl%lod_north_u /= 1 .AND. nest_offl%lod_north_u /= 2 ) nest_offl%lod_north_u = 2
2639	IF ( nest_offl%lod_north_v /= 1 .AND. nest_offl%lod_north_v /= 2 ) nest_offl%lod_north_v = 2
2640	IF ( nest_offl%lod_north_w /= 1 .AND. nest_offl%lod_north_w /= 2 ) nest_offl%lod_north_w = 2
2641
2642	IF ( nest_offl%lod_south_pt /= 1 .AND. nest_offl%lod_south_pt /= 2 ) nest_offl%lod_south_pt = 2
2643	IF ( nest_offl%lod_south_qv /= 1 .AND. nest_offl%lod_south_qv /= 2 ) nest_offl%lod_south_qv = 2
2644	IF ( nest_offl%lod_south_u /= 1 .AND. nest_offl%lod_south_u /= 2 ) nest_offl%lod_south_u = 2
2645	IF ( nest_offl%lod_south_v /= 1 .AND. nest_offl%lod_south_v /= 2 ) nest_offl%lod_south_v = 2
2646	IF ( nest_offl%lod_south_w /= 1 .AND. nest_offl%lod_south_w /= 2 ) nest_offl%lod_south_w = 2
2647
2648	IF ( nest_offl%lod_west_pt /= 1 .AND. nest_offl%lod_west_pt /= 2 ) nest_offl%lod_west_pt = 2
2649	IF ( nest_offl%lod_west_qv /= 1 .AND. nest_offl%lod_west_qv /= 2 ) nest_offl%lod_west_qv = 2
2650	IF ( nest_offl%lod_west_u /= 1 .AND. nest_offl%lod_west_u /= 2 ) nest_offl%lod_west_u = 2
2651	IF ( nest_offl%lod_west_v /= 1 .AND. nest_offl%lod_west_v /= 2 ) nest_offl%lod_west_v = 2
2652	IF ( nest_offl%lod_west_w /= 1 .AND. nest_offl%lod_west_w /= 2 ) nest_offl%lod_west_w = 2
2653
2654	IF ( nest_offl%lod_top_pt /= 1 .AND. nest_offl%lod_top_pt /= 2 ) nest_offl%lod_top_pt = 2
2655	IF ( nest_offl%lod_top_qv /= 1 .AND. nest_offl%lod_top_qv /= 2 ) nest_offl%lod_top_qv = 2
2656	IF ( nest_offl%lod_top_u /= 1 .AND. nest_offl%lod_top_u /= 2 ) nest_offl%lod_top_u = 2
2657	IF ( nest_offl%lod_top_v /= 1 .AND. nest_offl%lod_top_v /= 2 ) nest_offl%lod_top_v = 2
2658	IF ( nest_offl%lod_top_w /= 1 .AND. nest_offl%lod_top_w /= 2 ) nest_offl%lod_top_w = 2
2659	!
2660	!-- For consistency, check if all boundary input variables have the same LOD.
2661	IF ( MAX( nest_offl%lod_east_pt, nest_offl%lod_east_qv, nest_offl%lod_east_u, &
2662	nest_offl%lod_east_v, nest_offl%lod_east_w, &
2663	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2664	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2665	nest_offl%lod_south_pt, nest_offl%lod_south_qv, nest_offl%lod_south_u, &
2666	nest_offl%lod_south_v, nest_offl%lod_south_w, &
2667	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2668	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2669	nest_offl%lod_top_pt, nest_offl%lod_top_qv, nest_offl%lod_top_u, &
2670	nest_offl%lod_top_v, nest_offl%lod_top_w ) &
2671	/= &
2672	MIN( nest_offl%lod_east_pt, nest_offl%lod_east_qv, nest_offl%lod_east_u, &
2673	nest_offl%lod_east_v, nest_offl%lod_east_w, &
2674	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2675	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2676	nest_offl%lod_south_pt, nest_offl%lod_south_qv, nest_offl%lod_south_u, &
2677	nest_offl%lod_south_v, nest_offl%lod_south_w, &
2678	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2679	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2680	nest_offl%lod_top_pt, nest_offl%lod_top_qv, nest_offl%lod_top_u, &
2681	nest_offl%lod_top_v, nest_offl%lod_top_w ) ) THEN
2682	message_string = 'A mixture of different LOD for the provided boundary data is not ' // &
2683	'possible.'
2684	CALL message( 'nesting_offl_init', 'PA0504', 1, 2, 0, 6, 0 )
2685	ENDIF
2686	!
2687	!-- As all LODs are the same, store it.
2688	lod = nest_offl%lod_east_u
2689	!
2690	!-- Allocate arrays for geostrophic wind components. Arrays will
2691	!-- incorporate 2 time levels in order to interpolate in between.
2692	ALLOCATE( nest_offl%ug(0:1,1:nzt) )
2693	ALLOCATE( nest_offl%vg(0:1,1:nzt) )
2694	!
2695	!-- Set index range according to the given LOD in order to allocate the input arrays
2696	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2697	IF ( lod == 2 ) THEN
2698	j_start = nys
2699	j_start_v = nysv
2700	j_end = nyn
2701	ELSE
2702	j_start = 1
2703	j_start_v = 1
2704	j_end = 1
2705	ENDIF
2706	ENDIF
2707
2708	IF ( bc_dirichlet_n .OR. bc_dirichlet_s ) THEN
2709	IF( lod == 2 ) THEN
2710	i_start = nxl
2711	i_start_u = nxlu
2712	i_end = nxr
2713	ELSE
2714	i_start = 1
2715	i_start_u = 1
2716	i_end = 1
2717	ENDIF
2718	ENDIF
2719	!
2720	!-- Allocate arrays for reading left/right boundary values. Arrays will
2721	!-- incorporate 2 time levels in order to interpolate in between. Depending on the given LOD,
2722	!-- the x-, or y-dimension will be either nxl:nxr, or nys:nyn (for LOD=2), or it reduces to
2723	!-- one element for LOD=1. If the core has no lateral boundary, allocate a dummy array as well,
2724	!-- in order to enable netcdf parallel access. Dummy arrays will be allocated with dimension
2725	!-- length zero.
2726	IF ( bc_dirichlet_l ) THEN
2727	ALLOCATE( nest_offl%u_l(0:1,nzb+1:nzt,j_start:j_end) )
2728	ALLOCATE( nest_offl%v_l(0:1,nzb+1:nzt,j_start_v:j_end) )
2729	ALLOCATE( nest_offl%w_l(0:1,nzb+1:nzt-1,j_start:j_end) )
2730	IF ( humidity ) ALLOCATE( nest_offl%q_l(0:1,nzb+1:nzt,j_start:j_end) )
2731	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_l(0:1,nzb+1:nzt,j_start:j_end) )
2732	IF ( air_chemistry .AND. nesting_offline_chem ) &
2733	ALLOCATE( nest_offl%chem_l(0:1,nzb+1:nzt,j_start:j_end,1:UBOUND( chem_species, 1 )) )
2734	ELSE
2735	ALLOCATE( nest_offl%u_l(1:1,1:1,1:1) )
2736	ALLOCATE( nest_offl%v_l(1:1,1:1,1:1) )
2737	ALLOCATE( nest_offl%w_l(1:1,1:1,1:1) )
2738	IF ( humidity ) ALLOCATE( nest_offl%q_l(1:1,1:1,1:1) )
2739	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_l(1:1,1:1,1:1) )
2740	IF ( air_chemistry .AND. nesting_offline_chem ) &
2741	ALLOCATE( nest_offl%chem_l(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2742	ENDIF
2743	IF ( bc_dirichlet_r ) THEN
2744	ALLOCATE( nest_offl%u_r(0:1,nzb+1:nzt,j_start:j_end) )
2745	ALLOCATE( nest_offl%v_r(0:1,nzb+1:nzt,j_start_v:j_end) )
2746	ALLOCATE( nest_offl%w_r(0:1,nzb+1:nzt-1,j_start:j_end) )
2747	IF ( humidity ) ALLOCATE( nest_offl%q_r(0:1,nzb+1:nzt,j_start:j_end) )
2748	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_r(0:1,nzb+1:nzt,j_start:j_end) )
2749	IF ( air_chemistry .AND. nesting_offline_chem ) &
2750	ALLOCATE( nest_offl%chem_r(0:1,nzb+1:nzt,j_start:j_end,1:UBOUND( chem_species, 1 )) )
2751	ELSE
2752	ALLOCATE( nest_offl%u_r(1:1,1:1,1:1) )
2753	ALLOCATE( nest_offl%v_r(1:1,1:1,1:1) )
2754	ALLOCATE( nest_offl%w_r(1:1,1:1,1:1) )
2755	IF ( humidity ) ALLOCATE( nest_offl%q_r(1:1,1:1,1:1) )
2756	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_r(1:1,1:1,1:1) )
2757	IF ( air_chemistry .AND. nesting_offline_chem ) &
2758	ALLOCATE( nest_offl%chem_r(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2759	ENDIF
2760	!
2761	!-- Allocate arrays for reading north/south boundary values. Arrays will
2762	!-- incorporate 2 time levels in order to interpolate in between. If the core has
2763	!-- no boundary, allocate a dummy array, in order to enable netcdf parallel
2764	!-- access. Dummy arrays will be allocated with dimension length zero.
2765	IF ( bc_dirichlet_n ) THEN
2766	ALLOCATE( nest_offl%u_n(0:1,nzb+1:nzt,i_start_u:i_end) )
2767	ALLOCATE( nest_offl%v_n(0:1,nzb+1:nzt,i_start:i_end) )
2768	ALLOCATE( nest_offl%w_n(0:1,nzb+1:nzt-1,i_start:i_end) )
2769	IF ( humidity ) ALLOCATE( nest_offl%q_n(0:1,nzb+1:nzt,i_start:i_end) )
2770	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_n(0:1,nzb+1:nzt,i_start:i_end) )
2771	IF ( air_chemistry .AND. nesting_offline_chem ) &
2772	ALLOCATE( nest_offl%chem_n(0:1,nzb+1:nzt,i_start:i_end,1:UBOUND( chem_species, 1 )) )
2773	ELSE
2774	ALLOCATE( nest_offl%u_n(1:1,1:1,1:1) )
2775	ALLOCATE( nest_offl%v_n(1:1,1:1,1:1) )
2776	ALLOCATE( nest_offl%w_n(1:1,1:1,1:1) )
2777	IF ( humidity ) ALLOCATE( nest_offl%q_n(1:1,1:1,1:1) )
2778	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_n(1:1,1:1,1:1) )
2779	IF ( air_chemistry .AND. nesting_offline_chem ) &
2780	ALLOCATE( nest_offl%chem_n(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2781	ENDIF
2782	IF ( bc_dirichlet_s ) THEN
2783	ALLOCATE( nest_offl%u_s(0:1,nzb+1:nzt,i_start_u:i_end) )
2784	ALLOCATE( nest_offl%v_s(0:1,nzb+1:nzt,i_start:i_end) )
2785	ALLOCATE( nest_offl%w_s(0:1,nzb+1:nzt-1,i_start:i_end) )
2786	IF ( humidity ) ALLOCATE( nest_offl%q_s(0:1,nzb+1:nzt,i_start:i_end) )
2787	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_s(0:1,nzb+1:nzt,i_start:i_end) )
2788	IF ( air_chemistry .AND. nesting_offline_chem ) &
2789	ALLOCATE( nest_offl%chem_s(0:1,nzb+1:nzt,i_start:i_end,1:UBOUND( chem_species, 1 )) )
2790	ELSE
2791	ALLOCATE( nest_offl%u_s(1:1,1:1,1:1) )
2792	ALLOCATE( nest_offl%v_s(1:1,1:1,1:1) )
2793	ALLOCATE( nest_offl%w_s(1:1,1:1,1:1) )
2794	IF ( humidity ) ALLOCATE( nest_offl%q_s(1:1,1:1,1:1) )
2795	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_s(1:1,1:1,1:1) )
2796	IF ( air_chemistry .AND. nesting_offline_chem ) &
2797	ALLOCATE( nest_offl%chem_s(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2798	ENDIF
2799	!
2800	!-- Allocate arrays for reading data at the top boundary. In contrast to the
2801	!-- lateral boundaries, every core reads these data so that no dummy
2802	!-- arrays need to be allocated.
2803	IF ( lod == 2 ) THEN
2804	ALLOCATE( nest_offl%u_top(0:1,nys:nyn,nxlu:nxr) )
2805	ALLOCATE( nest_offl%v_top(0:1,nysv:nyn,nxl:nxr) )
2806	ALLOCATE( nest_offl%w_top(0:1,nys:nyn,nxl:nxr) )
2807	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,nys:nyn,nxl:nxr) )
2808	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,nys:nyn,nxl:nxr) )
2809	IF ( air_chemistry .AND. nesting_offline_chem ) &
2810	ALLOCATE( nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,1:UBOUND( chem_species, 1 )) )
2811	ELSE
2812	ALLOCATE( nest_offl%u_top(0:1,1:1,1:1) )
2813	ALLOCATE( nest_offl%v_top(0:1,1:1,1:1) )
2814	ALLOCATE( nest_offl%w_top(0:1,1:1,1:1) )
2815	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,1:1,1:1) )
2816	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,1:1,1:1) )
2817	IF ( air_chemistry .AND. nesting_offline_chem ) &
2818	ALLOCATE( nest_offl%chem_top(0:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2819	ENDIF
2820	!
2821	!-- For chemical species, create the names of the variables. This is necessary
2822	!-- to identify the respective variable and write it onto the correct array
2823	!-- in the chem_species datatype.
2824	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2825	ALLOCATE( nest_offl%chem_from_file_l(1:UBOUND( chem_species, 1 )) )
2826	ALLOCATE( nest_offl%chem_from_file_n(1:UBOUND( chem_species, 1 )) )
2827	ALLOCATE( nest_offl%chem_from_file_r(1:UBOUND( chem_species, 1 )) )
2828	ALLOCATE( nest_offl%chem_from_file_s(1:UBOUND( chem_species, 1 )) )
2829	ALLOCATE( nest_offl%chem_from_file_t(1:UBOUND( chem_species, 1 )) )
2830
2831	ALLOCATE( nest_offl%var_names_chem_l(1:UBOUND( chem_species, 1 )) )
2832	ALLOCATE( nest_offl%var_names_chem_n(1:UBOUND( chem_species, 1 )) )
2833	ALLOCATE( nest_offl%var_names_chem_r(1:UBOUND( chem_species, 1 )) )
2834	ALLOCATE( nest_offl%var_names_chem_s(1:UBOUND( chem_species, 1 )) )
2835	ALLOCATE( nest_offl%var_names_chem_t(1:UBOUND( chem_species, 1 )) )
2836	!
2837	!-- Initialize flags that indicate whether the variable is on file or
2838	!-- not. Please note, this is only necessary for chemistry variables.
2839	nest_offl%chem_from_file_l(:) = .FALSE.
2840	nest_offl%chem_from_file_n(:) = .FALSE.
2841	nest_offl%chem_from_file_r(:) = .FALSE.
2842	nest_offl%chem_from_file_s(:) = .FALSE.
2843	nest_offl%chem_from_file_t(:) = .FALSE.
2844
2845	DO n = 1, UBOUND( chem_species, 1 )
2846	nest_offl%var_names_chem_l(n) = nest_offl%char_l // &
2847	TRIM(chem_species(n)%name)
2848	nest_offl%var_names_chem_n(n) = nest_offl%char_n // &
2849	TRIM(chem_species(n)%name)
2850	nest_offl%var_names_chem_r(n) = nest_offl%char_r // &
2851	TRIM(chem_species(n)%name)
2852	nest_offl%var_names_chem_s(n) = nest_offl%char_s // &
2853	TRIM(chem_species(n)%name)
2854	nest_offl%var_names_chem_t(n) = nest_offl%char_t // &
2855	TRIM(chem_species(n)%name)
2856	ENDDO
2857	ENDIF
2858	!
2859	!-- Offline nesting for salsa
2860	IF ( salsa ) CALL salsa_nesting_offl_init
2861	!
2862	!-- Before initial data input is initiated, check if dynamic input file is
2863	!-- present.
2864	IF ( .NOT. input_pids_dynamic ) THEN
2865	message_string = 'nesting_offline = .TRUE. requires dynamic ' // &
2866	'input file ' // &
2867	TRIM( input_file_dynamic ) // TRIM( coupling_char )
2868	CALL message( 'nesting_offl_init', 'PA0546', 1, 2, 0, 6, 0 )
2869	ENDIF
2870	!
2871	!-- Read COSMO data at lateral and top boundaries
2872	CALL nesting_offl_input
2873	!
2874	!-- Check if sufficient time steps are provided to cover the entire
2875	!-- simulation. Note, dynamic input is only required for the 3D simulation,
2876	!-- not for the soil/wall spinup. However, as the spinup time is added
2877	!-- to the end_time, this must be considered here.
2878	IF ( end_time - spinup_time > nest_offl%time(nest_offl%nt-1) ) THEN
2879	message_string = 'end_time of the simulation exceeds the ' // &
2880	'time dimension in the dynamic input file.'
2881	CALL message( 'nesting_offl_init', 'PA0183', 1, 2, 0, 6, 0 )
2882	ENDIF
2883	!
2884	!-- Set indicies for boundary grid points
2885	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2886	i_bound = MERGE( nxl - 1, nxr + 1, bc_dirichlet_l )
2887	i_bound_u = MERGE( nxlu - 1, nxr + 1, bc_dirichlet_l )
2888	ENDIF
2889	IF ( bc_dirichlet_n .OR. bc_dirichlet_s ) THEN
2890	j_bound = MERGE( nys - 1, nyn + 1, bc_dirichlet_s )
2891	j_bound_v = MERGE( nysv - 1, nyn + 1, bc_dirichlet_s )
2892	ENDIF
2893	!
2894	!-- Initialize boundary data. Please note, do not initialize boundaries in
2895	!-- case of restart runs. This case the boundaries are already initialized
2896	!-- and the boundary data from file would be on the wrong time level.
2897	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
2898	!
2899	!-- Distinguish between LOD = 1 and LOD = 2 inititialization
2900	IF ( lod == 2 ) THEN
2901	IF ( bc_dirichlet_l ) THEN
2902	u(nzb+1:nzt,nys:nyn,i_bound_u) = nest_offl%u_l(0,nzb+1:nzt,nys:nyn)
2903	v(nzb+1:nzt,nysv:nyn,i_bound) = nest_offl%v_l(0,nzb+1:nzt,nysv:nyn)
2904	w(nzb+1:nzt-1,nys:nyn,i_bound) = nest_offl%w_l(0,nzb+1:nzt-1,nys:nyn)
2905	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%pt_l(0,nzb+1:nzt,nys:nyn)
2906	IF ( humidity ) q(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%q_l(0,nzb+1:nzt,nys:nyn)
2907	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2908	DO n = 1, UBOUND( chem_species, 1 )
2909	IF( nest_offl%chem_from_file_l(n) ) THEN
2910	chem_species(n)%conc(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%chem_l(0,nzb+1:nzt,nys:nyn,n)
2911	ENDIF
2912	ENDDO
2913	ENDIF
2914	ENDIF
2915	IF ( bc_dirichlet_r ) THEN
2916	u(nzb+1:nzt,nys:nyn,i_bound_u) = nest_offl%u_r(0,nzb+1:nzt,nys:nyn)
2917	v(nzb+1:nzt,nysv:nyn,i_bound) = nest_offl%v_r(0,nzb+1:nzt,nysv:nyn)
2918	w(nzb+1:nzt-1,nys:nyn,i_bound) = nest_offl%w_r(0,nzb+1:nzt-1,nys:nyn)
2919	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%pt_r(0,nzb+1:nzt,nys:nyn)
2920	IF ( humidity ) q(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%q_r(0,nzb+1:nzt,nys:nyn)
2921	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2922	DO n = 1, UBOUND( chem_species, 1 )
2923	IF( nest_offl%chem_from_file_r(n) ) THEN
2924	chem_species(n)%conc(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%chem_r(0,nzb+1:nzt,nys:nyn,n)
2925	ENDIF
2926	ENDDO
2927	ENDIF
2928	ENDIF
2929
2930	IF ( bc_dirichlet_n) THEN
2931	u(nzb+1:nzt,j_bound,nxlu:nxr) = nest_offl%u_n(0,nzb+1:nzt,nxlu:nxr)
2932	v(nzb+1:nzt,j_bound_v,nxl:nxr) = nest_offl%v_n(0,nzb+1:nzt,nxl:nxr)
2933	w(nzb+1:nzt-1,j_bound,nxl:nxr) = nest_offl%w_n(0,nzb+1:nzt-1,nxl:nxr)
2934	IF ( .NOT. neutral ) pt(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%pt_n(0,nzb+1:nzt,nxl:nxr)
2935	IF ( humidity ) q(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%q_n(0,nzb+1:nzt,nxl:nxr)
2936	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2937	DO n = 1, UBOUND( chem_species, 1 )
2938	IF( nest_offl%chem_from_file_n(n) ) THEN
2939	chem_species(n)%conc(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%chem_n(0,nzb+1:nzt,nxl:nxr,n)
2940	ENDIF
2941	ENDDO
2942	ENDIF
2943	ENDIF
2944	IF ( bc_dirichlet_s) THEN
2945	u(nzb+1:nzt,j_bound,nxlu:nxr) = nest_offl%u_s(0,nzb+1:nzt,nxlu:nxr)
2946	v(nzb+1:nzt,j_bound_v,nxl:nxr) = nest_offl%v_s(0,nzb+1:nzt,nxl:nxr)
2947	w(nzb+1:nzt-1,j_bound,nxl:nxr) = nest_offl%w_s(0,nzb+1:nzt-1,nxl:nxr)
2948	IF ( .NOT. neutral ) pt(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%pt_s(0,nzb+1:nzt,nxl:nxr)
2949	IF ( humidity ) q(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%q_s(0,nzb+1:nzt,nxl:nxr)
2950	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2951	DO n = 1, UBOUND( chem_species, 1 )
2952	IF( nest_offl%chem_from_file_s(n) ) THEN
2953	chem_species(n)%conc(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%chem_s(0,nzb+1:nzt,nxl:nxr,n)
2954	ENDIF
2955	ENDDO
2956	ENDIF
2957	ENDIF
2958
2959	u(nzt+1,nys:nyn,nxlu:nxr) = nest_offl%u_top(0,nys:nyn,nxlu:nxr)
2960	v(nzt+1,nysv:nyn,nxl:nxr) = nest_offl%v_top(0,nysv:nyn,nxl:nxr)
2961	w(nzt,nys:nyn,nxl:nxr) = nest_offl%w_top(0,nys:nyn,nxl:nxr)
2962	w(nzt+1,nys:nyn,nxl:nxr) = nest_offl%w_top(0,nys:nyn,nxl:nxr)
2963	IF ( .NOT. neutral ) pt(nzt+1,nys:nyn,nxl:nxr) = nest_offl%pt_top(0,nys:nyn,nxl:nxr)
2964	IF ( humidity ) q(nzt+1,nys:nyn,nxl:nxr) = nest_offl%q_top(0,nys:nyn,nxl:nxr)
2965	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2966	DO n = 1, UBOUND( chem_species, 1 )
2967	IF( nest_offl%chem_from_file_t(n) ) THEN
2968	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = nest_offl%chem_top(0,nys:nyn,nxl:nxr,n)
2969	ENDIF
2970	ENDDO
2971	ENDIF
2972	!
2973	!-- LOD 1
2974	ELSE
2975	IF ( bc_dirichlet_l ) THEN
2976	DO j = nys, nyn
2977	u(nzb+1:nzt,j,i_bound_u) = nest_offl%u_l(0,nzb+1:nzt,1)
2978	w(nzb+1:nzt-1,j,i_bound) = nest_offl%w_l(0,nzb+1:nzt-1,1)
2979	ENDDO
2980	DO j = nysv, nyn
2981	v(nzb+1:nzt,j,i_bound) = nest_offl%v_l(0,nzb+1:nzt,1)
2982	ENDDO
2983	IF ( .NOT. neutral ) THEN
2984	DO j = nys, nyn
2985	pt(nzb+1:nzt,j,i_bound) = nest_offl%pt_l(0,nzb+1:nzt,1)
2986	ENDDO
2987	ENDIF
2988	IF ( humidity ) THEN
2989	DO j = nys, nyn
2990	q(nzb+1:nzt,j,i_bound) = nest_offl%q_l(0,nzb+1:nzt,1)
2991	ENDDO
2992	ENDIF
2993	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2994	DO n = 1, UBOUND( chem_species, 1 )
2995	IF( nest_offl%chem_from_file_l(n) ) THEN
2996	DO j = nys, nyn
2997	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = nest_offl%chem_l(0,nzb+1:nzt,1,n)
2998	ENDDO
2999	ENDIF
3000	ENDDO
3001	ENDIF
3002	ENDIF
3003	IF ( bc_dirichlet_r ) THEN
3004	DO j = nys, nyn
3005	u(nzb+1:nzt,j,i_bound_u) = nest_offl%u_r(0,nzb+1:nzt,1)
3006	w(nzb+1:nzt-1,j,i_bound) = nest_offl%w_r(0,nzb+1:nzt-1,1)
3007	ENDDO
3008	DO j = nysv, nyn
3009	v(nzb+1:nzt,j,i_bound) = nest_offl%v_r(0,nzb+1:nzt,1)
3010	ENDDO
3011	IF ( .NOT. neutral ) THEN
3012	DO j = nys, nyn
3013	pt(nzb+1:nzt,j,i_bound) = nest_offl%pt_r(0,nzb+1:nzt,1)
3014	ENDDO
3015	ENDIF
3016	IF ( humidity ) THEN
3017	DO j = nys, nyn
3018	q(nzb+1:nzt,j,i_bound) = nest_offl%q_r(0,nzb+1:nzt,1)
3019	ENDDO
3020	ENDIF
3021	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3022	DO n = 1, UBOUND( chem_species, 1 )
3023	IF( nest_offl%chem_from_file_r(n) ) THEN
3024	DO j = nys, nyn
3025	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = nest_offl%chem_r(0,nzb+1:nzt,1,n)
3026	ENDDO
3027	ENDIF
3028	ENDDO
3029	ENDIF
3030	ENDIF
3031	IF ( bc_dirichlet_n ) THEN
3032	DO i = nxlu, nxr
3033	u(nzb+1:nzt,j_bound,i) = nest_offl%u_n(0,nzb+1:nzt,1)
3034	ENDDO
3035	DO i = nxl, nxr
3036	v(nzb+1:nzt,j_bound_v,i) = nest_offl%v_n(0,nzb+1:nzt,1)
3037	w(nzb+1:nzt-1,j_bound,i) = nest_offl%w_n(0,nzb+1:nzt-1,1)
3038	ENDDO
3039	IF ( .NOT. neutral ) THEN
3040	DO i = nxl, nxr
3041	pt(nzb+1:nzt,j_bound,i) = nest_offl%pt_n(0,nzb+1:nzt,1)
3042	ENDDO
3043	ENDIF
3044	IF ( humidity ) THEN
3045	DO i = nxl, nxr
3046	q(nzb+1:nzt,j_bound,i) = nest_offl%q_n(0,nzb+1:nzt,1)
3047	ENDDO
3048	ENDIF
3049	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3050	DO n = 1, UBOUND( chem_species, 1 )
3051	IF( nest_offl%chem_from_file_n(n) ) THEN
3052	DO i = nxl, nxr
3053	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = nest_offl%chem_n(0,nzb+1:nzt,1,n)
3054	ENDDO
3055	ENDIF
3056	ENDDO
3057	ENDIF
3058	ENDIF
3059	IF ( bc_dirichlet_s ) THEN
3060	DO i = nxlu, nxr
3061	u(nzb+1:nzt,j_bound,i) = nest_offl%u_s(0,nzb+1:nzt,1)
3062	ENDDO
3063	DO i = nxl, nxr
3064	v(nzb+1:nzt,j_bound_v,i) = nest_offl%v_s(0,nzb+1:nzt,1)
3065	w(nzb+1:nzt-1,j_bound,i) = nest_offl%w_s(0,nzb+1:nzt-1,1)
3066	ENDDO
3067	IF ( .NOT. neutral ) THEN
3068	DO i = nxl, nxr
3069	pt(nzb+1:nzt,j_bound,i) = nest_offl%pt_s(0,nzb+1:nzt,1)
3070	ENDDO
3071	ENDIF
3072	IF ( humidity ) THEN
3073	DO i = nxl, nxr
3074	q(nzb+1:nzt,j_bound,i) = nest_offl%q_s(0,nzb+1:nzt,1)
3075	ENDDO
3076	ENDIF
3077	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3078	DO n = 1, UBOUND( chem_species, 1 )
3079	IF( nest_offl%chem_from_file_s(n) ) THEN
3080	DO i = nxl, nxr
3081	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = nest_offl%chem_s(0,nzb+1:nzt,1,n)
3082	ENDDO
3083	ENDIF
3084	ENDDO
3085	ENDIF
3086	ENDIF
3087
3088	u(nzt+1,nys:nyn,nxlu:nxr) = nest_offl%u_top(0,1,1)
3089	v(nzt+1,nysv:nyn,nxl:nxr) = nest_offl%v_top(0,1,1)
3090	w(nzt,nys:nyn,nxl:nxr) = nest_offl%w_top(0,1,1)
3091	w(nzt+1,nys:nyn,nxl:nxr) = nest_offl%w_top(0,1,1)
3092	IF ( .NOT. neutral ) pt(nzt+1,nys:nyn,nxl:nxr) = nest_offl%pt_top(0,1,1)
3093	IF ( humidity ) q(nzt+1,nys:nyn,nxl:nxr) = nest_offl%q_top(0,1,1)
3094	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3095	DO n = 1, UBOUND( chem_species, 1 )
3096	IF( nest_offl%chem_from_file_t(n) ) THEN
3097	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = nest_offl%chem_top(0,1,1,n)
3098	ENDIF
3099	ENDDO
3100	ENDIF
3101	ENDIF
3102	!
3103	!-- In case of offline nesting the pressure forms itself based on the prescribed lateral
3104	!-- boundary conditions. Hence, explicit forcing by pressure gradients via geostrophic
3105	!-- wind components is not necessary and would be canceled out by the perturbation
3106	!-- pressure otherwise. For this reason, set geostrophic wind components to zero.
3107	ug(nzb+1:nzt) = 0.0_wp
3108	vg(nzb+1:nzt) = 0.0_wp
3109
3110	ENDIF
3111	!
3112	!-- After boundary data is initialized, mask topography at the
3113	!-- boundaries for the velocity components.
3114	u = MERGE( u, 0.0_wp, BTEST( wall_flags_total_0, 1 ) )
3115	v = MERGE( v, 0.0_wp, BTEST( wall_flags_total_0, 2 ) )
3116	w = MERGE( w, 0.0_wp, BTEST( wall_flags_total_0, 3 ) )
3117	!
3118	!-- Initial calculation of the boundary layer depth from the prescribed
3119	!-- boundary data. This is requiered for initialize the synthetic turbulence
3120	!-- generator correctly.
3121	CALL nesting_offl_calc_zi
3122	!
3123	!-- After boundary data is initialized, ensure mass conservation. Not
3124	!-- necessary in restart runs.
3125	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
3126	CALL nesting_offl_mass_conservation
3127	ENDIF
3128
3129	END SUBROUTINE nesting_offl_init
3130
3131	!------------------------------------------------------------------------------!
3132	! Description:
3133	!------------------------------------------------------------------------------!
3134	!> Interpolation function, used to interpolate boundary data in time.
3135	!------------------------------------------------------------------------------!
3136	FUNCTION interpolate_in_time( var_t1, var_t2, fac )
3137
3138	REAL(wp) :: interpolate_in_time !< time-interpolated boundary value
3139	REAL(wp) :: var_t1 !< boundary value at t1
3140	REAL(wp) :: var_t2 !< boundary value at t2
3141	REAL(wp) :: fac !< interpolation factor
3142
3143	interpolate_in_time = ( 1.0_wp - fac ) * var_t1 + fac * var_t2
3144
3145	END FUNCTION interpolate_in_time
3146
3147
3148
3149	END MODULE nesting_offl_mod

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