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source: palm/trunk/SOURCE/nesting_offl_mod.f90 @ 4754

Last change on this file since 4754 was 4724, checked in by suehring, 4 years ago
Mesoscale offline nesting: enable LOD 1 (homogeneous) input of lateral and top boundary conditions; add new generic subroutines to read time-dependent profile data from dynamic input file; minor bugfix - add missing initialization of the top boundary
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File size: 177.5 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 4724 2020-10-06 17:20:39Z schwenkel $
27	! - Enable LOD=1 input of boundary conditions
28	! - Minor bugfix - add missing initialization of the top boundary
29	!
30	! 4582 2020-06-29 09:22:11Z suehring
31	! Remove unused variable
32	!
33	! 4581 2020-06-29 08:49:58Z suehring
34	! Omit explicit pressure forcing via geostrophic wind components in case of
35	! mesoscale nesting.
36	!
37	! 4561 2020-06-12 07:05:56Z suehring
38	! Adapt mass-flux correction also for the anelastic approximation
39	!
40	! 4561 2020-06-12 07:05:56Z suehring
41	! use statement for exchange horiz added
42	!
43	! 4360 2020-01-07 11:25:50Z suehring
44	! Bugfix, time coordinate is relative to origin_time rather than to 00:00:00
45	! UTC.
46	!
47	! 4346 2019-12-18 11:55:56Z motisi
48	! Introduction of wall_flags_total_0, which currently sets bits based on static
49	! topography information used in wall_flags_static_0
50	!
51	! 4329 2019-12-10 15:46:36Z motisi
52	! Renamed wall_flags_0 to wall_flags_static_0
53	!
54	! 4286 2019-10-30 16:01:14Z resler
55	! Fix wrong checks of time from dynamic driver in nesting_offl_mod
56	!
57	! 4273 2019-10-24 13:40:54Z monakurppa
58	! Add a logical switch nesting_offline_chem
59	!
60	! 4270 2019-10-23 10:46:20Z monakurppa
61	! Implement offline nesting for salsa variables.
62	!
63	! 4231 2019-09-12 11:22:00Z suehring
64	! Bugfix in array deallocation
65	!
66	! 4230 2019-09-11 13:58:14Z suehring
67	! Update mean chemistry profiles. These are also used for rayleigh damping.
68	!
69	! 4227 2019-09-10 18:04:34Z gronemeier
70	! implement new palm_date_time_mod
71	!
72	! - Data input moved into nesting_offl_mod
73	! - check rephrased
74	! - time variable is now relative to time_utc_init
75	! - Define module specific data type for offline nesting in nesting_offl_mod
76	!
77	! 4182 2019-08-22 15:20:23Z scharf
78	! Corrected "Former revisions" section
79	!
80	! 4169 2019-08-19 13:54:35Z suehring
81	! Additional check added.
82	!
83	! 4168 2019-08-16 13:50:17Z suehring
84	! Replace function get_topography_top_index by topo_top_ind
85	!
86	! 4125 2019-07-29 13:31:44Z suehring
87	! In order to enable netcdf parallel access, allocate dummy arrays for the
88	! lateral boundary data on cores that actually do not belong to these
89	! boundaries.
90	!
91	! 4079 2019-07-09 18:04:41Z suehring
92	! - Set boundary condition for w at nzt+1 at the lateral boundaries, even
93	! though these won't enter the numerical solution. However, due to the mass
94	! conservation these values might some up to very large values which will
95	! occur in the run-control file
96	! - Bugfix in offline nesting of chemical species
97	! - Do not set Neumann conditions for TKE and passive scalar
98	!
99	! 4022 2019-06-12 11:52:39Z suehring
100	! Detection of boundary-layer depth in stable boundary layer on basis of
101	! boundary data improved
102	! Routine for boundary-layer depth calculation renamed and made public
103	!
104	! 3987 2019-05-22 09:52:13Z kanani
105	! Introduce alternative switch for debug output during timestepping
106	!
107	! 3964 2019-05-09 09:48:32Z suehring
108	! Ensure that veloctiy term in calculation of bulk Richardson number does not
109	! become zero
110	!
111	! 3937 2019-04-29 15:09:07Z suehring
112	! Set boundary conditon on upper-left and upper-south grid point for the u- and
113	! v-component, respectively.
114	!
115	! 3891 2019-04-12 17:52:01Z suehring
116	! Bugfix, do not overwrite lateral and top boundary data in case of restart
117	! runs.
118	!
119	! 3885 2019-04-11 11:29:34Z kanani
120	! Changes related to global restructuring of location messages and introduction
121	! of additional debug messages
122	!
123	!
124	! Do local data exchange for chemistry variables only when boundary data is
125	! coming from dynamic file
126	!
127	! 3737 2019-02-12 16:57:06Z suehring
128	! Introduce mesoscale nesting for chemical species
129	!
130	! 3705 2019-01-29 19:56:39Z suehring
131	! Formatting adjustments
132	!
133	! 3704 2019-01-29 19:51:41Z suehring
134	! Check implemented for offline nesting in child domain
135	!
136	! Initial Revision:
137	! - separate offline nesting from large_scale_nudging_mod
138	! - revise offline nesting, adjust for usage of synthetic turbulence generator
139	! - adjust Rayleigh damping depending on the time-depending atmospheric
140	! conditions
141	!
142	!
143	! Description:
144	! ------------
145	!> Offline nesting in larger-scale models. Boundary conditions for the simulation
146	!> are read from NetCDF file and are prescribed onto the respective arrays.
147	!> Further, a mass-flux correction is performed to maintain the mass balance.
148	!--------------------------------------------------------------------------------!
149	MODULE nesting_offl_mod
150
151	USE arrays_3d, &
152	ONLY: dzw, &
153	e, &
154	drho_air_zw, &
155	diss, &
156	pt, &
157	pt_init, &
158	q, &
159	q_init, &
160	rdf, &
161	rdf_sc, &
162	rho_air, &
163	rho_air_zw, &
164	s, &
165	u, &
166	u_init, &
167	ug, &
168	v, &
169	v_init, &
170	vg, &
171	w, &
172	zu, &
173	zw
174
175	USE basic_constants_and_equations_mod, &
176	ONLY: g, &
177	pi
178
179	USE chem_modules, &
180	ONLY: chem_species, nesting_offline_chem
181
182	USE control_parameters, &
183	ONLY: air_chemistry, &
184	bc_dirichlet_l, &
185	bc_dirichlet_n, &
186	bc_dirichlet_r, &
187	bc_dirichlet_s, &
188	coupling_char, &
189	dt_3d, &
190	dz, &
191	constant_diffusion, &
192	child_domain, &
193	debug_output_timestep, &
194	end_time, &
195	humidity, &
196	initializing_actions, &
197	message_string, &
198	nesting_offline, &
199	neutral, &
200	passive_scalar, &
201	rans_mode, &
202	rans_tke_e, &
203	rayleigh_damping_factor, &
204	rayleigh_damping_height, &
205	salsa, &
206	spinup_time, &
207	time_since_reference_point, &
208	volume_flow
209
210	USE cpulog, &
211	ONLY: cpu_log, &
212	log_point, &
213	log_point_s
214
215	USE grid_variables
216
217	USE indices, &
218	ONLY: nbgp, nx, nxl, nxlg, nxlu, nxr, nxrg, ny, nys, &
219	nysv, nysg, nyn, nyng, nzb, nz, nzt, &
220	topo_top_ind, &
221	wall_flags_total_0
222
223	USE kinds
224
225	USE netcdf_data_input_mod, &
226	ONLY: char_fill, &
227	char_lod, &
228	check_existence, &
229	close_input_file, &
230	get_attribute, &
231	get_dimension_length, &
232	get_variable, &
233	get_variable_pr, &
234	input_pids_dynamic, &
235	inquire_num_variables, &
236	inquire_variable_names, &
237	input_file_dynamic, &
238	num_var_pids, &
239	open_read_file, &
240	pids_id
241
242	USE pegrid
243
244	USE salsa_mod, &
245	ONLY: salsa_nesting_offl_bc, &
246	salsa_nesting_offl_init, &
247	salsa_nesting_offl_input
248
249	IMPLICIT NONE
250
251	!
252	!-- Define data type for nesting in larger-scale models like COSMO.
253	!-- Data type comprises u, v, w, pt, and q at lateral and top boundaries.
254	TYPE nest_offl_type
255
256	CHARACTER(LEN=16) :: char_l = 'ls_forcing_left_' !< leading substring for variables at left boundary
257	CHARACTER(LEN=17) :: char_n = 'ls_forcing_north_' !< leading substring for variables at north boundary
258	CHARACTER(LEN=17) :: char_r = 'ls_forcing_right_' !< leading substring for variables at right boundary
259	CHARACTER(LEN=17) :: char_s = 'ls_forcing_south_' !< leading substring for variables at south boundary
260	CHARACTER(LEN=15) :: char_t = 'ls_forcing_top_' !< leading substring for variables at top boundary
261
262	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names !< list of variable in dynamic input file
263	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_l !< names of mesoscale nested chemistry variables at left boundary
264	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_n !< names of mesoscale nested chemistry variables at north boundary
265	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_r !< names of mesoscale nested chemistry variables at right boundary
266	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_s !< names of mesoscale nested chemistry variables at south boundary
267	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_t !< names of mesoscale nested chemistry variables at top boundary
268
269	INTEGER(iwp) :: lod_east_pt = 2 !< level-of-detail of input data of potential temperature at the eastern boundary
270	INTEGER(iwp) :: lod_east_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the eastern boundary
271	INTEGER(iwp) :: lod_east_qv = 2 !< level-of-detail of input data of specific humidity at the eastern boundary
272	INTEGER(iwp) :: lod_east_u = 2 !< level-of-detail of input data of the u-component at the eastern boundary
273	INTEGER(iwp) :: lod_east_v = 2 !< level-of-detail of input data of the v-component at the eastern boundary
274	INTEGER(iwp) :: lod_east_w = 2 !< level-of-detail of input data of the w-component at the eastern boundary
275	INTEGER(iwp) :: lod_north_pt = 2 !< level-of-detail of input data of potential temperature at the northern boundary
276	INTEGER(iwp) :: lod_north_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the northern boundary
277	INTEGER(iwp) :: lod_north_qv = 2 !< level-of-detail of input data of specific humidity at the northern boundary
278	INTEGER(iwp) :: lod_north_u = 2 !< level-of-detail of input data of the u-component at the northern boundary
279	INTEGER(iwp) :: lod_north_v = 2 !< level-of-detail of input data of the v-component at the northern boundary
280	INTEGER(iwp) :: lod_north_w = 2 !< level-of-detail of input data of the w-component at the northern boundary
281	INTEGER(iwp) :: lod_south_pt = 2 !< level-of-detail of input data of potential temperature at the southern boundary
282	INTEGER(iwp) :: lod_south_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the southern boundary
283	INTEGER(iwp) :: lod_south_qv = 2 !< level-of-detail of input data of specific humidity at the southern boundary
284	INTEGER(iwp) :: lod_south_u = 2 !< level-of-detail of input data of the u-component at the southern boundary
285	INTEGER(iwp) :: lod_south_v = 2 !< level-of-detail of input data of the v-component at the southern boundary
286	INTEGER(iwp) :: lod_south_w = 2 !< level-of-detail of input data of the w-component at the southern boundary
287	INTEGER(iwp) :: lod_top_pt = 2 !< level-of-detail of input data of potential temperature at the top boundary
288	INTEGER(iwp) :: lod_top_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the top boundary
289	INTEGER(iwp) :: lod_top_qv = 2 !< level-of-detail of input data of specific humidity at the top boundary
290	INTEGER(iwp) :: lod_top_u = 2 !< level-of-detail of input data of the u-component at the top boundary
291	INTEGER(iwp) :: lod_top_v = 2 !< level-of-detail of input data of the v-component at the top boundary
292	INTEGER(iwp) :: lod_top_w = 2 !< level-of-detail of input data of the w-component at the top boundary
293	INTEGER(iwp) :: lod_west_pt = 2 !< level-of-detail of input data of potential temperature at the western boundary
294	INTEGER(iwp) :: lod_west_qc = 2 !< level-of-detail of input data of cloud-water mixture fraction at the western boundary
295	INTEGER(iwp) :: lod_west_qv = 2 !< level-of-detail of input data of specific humidity at the western boundary
296	INTEGER(iwp) :: lod_west_u = 2 !< level-of-detail of input data of the u-component at the western boundary
297	INTEGER(iwp) :: lod_west_v = 2 !< level-of-detail of input data of the v-component at the western boundary
298	INTEGER(iwp) :: lod_west_w = 2 !< level-of-detail of input data of the w-component at the western boundary
299	INTEGER(iwp) :: nt !< number of time levels in dynamic input file
300	INTEGER(iwp) :: nzu !< number of vertical levels on scalar grid in dynamic input file
301	INTEGER(iwp) :: nzw !< number of vertical levels on w grid in dynamic input file
302	INTEGER(iwp) :: tind !< time index for reference time in mesoscale-offline nesting
303	INTEGER(iwp) :: tind_p !< time index for following time in mesoscale-offline nesting
304
305	LOGICAL :: init = .FALSE. !< flag indicating that offline nesting is already initialized
306
307	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_l !< flags inidicating whether left boundary data for chemistry is in dynamic input file
308	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_n !< flags inidicating whether north boundary data for chemistry is in dynamic input file
309	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_r !< flags inidicating whether right boundary data for chemistry is in dynamic input file
310	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_s !< flags inidicating whether south boundary data for chemistry is in dynamic input file
311	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_t !< flags inidicating whether top boundary data for chemistry is in dynamic input file
312
313	REAL(wp), DIMENSION(:), ALLOCATABLE :: surface_pressure !< time dependent surface pressure
314	REAL(wp), DIMENSION(:), ALLOCATABLE :: time !< time levels in dynamic input file
315	REAL(wp), DIMENSION(:), ALLOCATABLE :: zu_atmos !< vertical levels at scalar grid in dynamic input file
316	REAL(wp), DIMENSION(:), ALLOCATABLE :: zw_atmos !< vertical levels at w grid in dynamic input file
317
318	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ug !< domain-averaged geostrophic component
319	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: vg !< domain-averaged geostrophic component
320
321	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_l !< mixing ratio at left boundary
322	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_n !< mixing ratio at north boundary
323	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_r !< mixing ratio at right boundary
324	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_s !< mixing ratio at south boundary
325	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_top !< mixing ratio at top boundary
326	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_l !< potentital temperautre at left boundary
327	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_n !< potentital temperautre at north boundary
328	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_r !< potentital temperautre at right boundary
329	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_s !< potentital temperautre at south boundary
330	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_top !< potentital temperautre at top boundary
331	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_l !< u-component at left boundary
332	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_n !< u-component at north boundary
333	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_r !< u-component at right boundary
334	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_s !< u-component at south boundary
335	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_top !< u-component at top boundary
336	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_l !< v-component at left boundary
337	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_n !< v-component at north boundary
338	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_r !< v-component at right boundary
339	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_s !< v-component at south boundary
340	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_top !< v-component at top boundary
341	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_l !< w-component at left boundary
342	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_n !< w-component at north boundary
343	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_r !< w-component at right boundary
344	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_s !< w-component at south boundary
345	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_top !< w-component at top boundary
346
347	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_l !< chemical species at left boundary
348	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_n !< chemical species at north boundary
349	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_r !< chemical species at right boundary
350	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_s !< chemical species at south boundary
351	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_top !< chemical species at left boundary
352
353	END TYPE nest_offl_type
354
355	INTEGER(iwp) :: i_bound !< boundary grid point in x-direction for scalars, v, and w
356	INTEGER(iwp) :: i_bound_u !< boundary grid point in x-direction for u
357	INTEGER(iwp) :: i_start !< start index for array allocation along x-direction at norther/southern boundary (scalars, v, w)
358	INTEGER(iwp) :: i_start_u !< start index for array allocation along x-direction at norther/southern boundary (u)
359	INTEGER(iwp) :: i_end !< end index for array allocation along x-direction at norther/southern boundary
360	INTEGER(iwp) :: j_bound !< boundary grid point in y-direction for scalars, u, and w
361	INTEGER(iwp) :: j_bound_v !< boundary grid point in y-direction for v
362	INTEGER(iwp) :: j_start !< start index for array allocation along y-direction at eastern/western boundary (scalars, u, w)
363	INTEGER(iwp) :: j_start_v !< start index for array allocation along y-direction at eastern/western boundary (v)
364	INTEGER(iwp) :: j_end !< end index for array allocation along y-direction at eastern/western boundary
365	INTEGER(iwp) :: lod !< level-of-detail of lateral input data
366
367	REAL(wp) :: fac_dt !< interpolation factor
368	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
369	!< bulk Richardson number of 0.2
370
371	TYPE(nest_offl_type) :: nest_offl !< data structure for data input at lateral and top boundaries (provided by Inifor)
372
373	SAVE
374	PRIVATE
375	!
376	!-- Public subroutines
377	PUBLIC nesting_offl_bc, &
378	nesting_offl_calc_zi, &
379	nesting_offl_check_parameters, &
380	nesting_offl_geostrophic_wind, &
381	nesting_offl_header, &
382	nesting_offl_init, &
383	nesting_offl_input, &
384	nesting_offl_interpolation_factor, &
385	nesting_offl_mass_conservation, &
386	nesting_offl_parin
387	!
388	!-- Public variables
389	PUBLIC zi_ribulk
390
391	INTERFACE nesting_offl_bc
392	MODULE PROCEDURE nesting_offl_bc
393	END INTERFACE nesting_offl_bc
394
395	INTERFACE nesting_offl_calc_zi
396	MODULE PROCEDURE nesting_offl_calc_zi
397	END INTERFACE nesting_offl_calc_zi
398
399	INTERFACE nesting_offl_check_parameters
400	MODULE PROCEDURE nesting_offl_check_parameters
401	END INTERFACE nesting_offl_check_parameters
402
403	INTERFACE nesting_offl_geostrophic_wind
404	MODULE PROCEDURE nesting_offl_geostrophic_wind
405	END INTERFACE nesting_offl_geostrophic_wind
406
407	INTERFACE nesting_offl_header
408	MODULE PROCEDURE nesting_offl_header
409	END INTERFACE nesting_offl_header
410
411	INTERFACE nesting_offl_init
412	MODULE PROCEDURE nesting_offl_init
413	END INTERFACE nesting_offl_init
414
415	INTERFACE nesting_offl_input
416	MODULE PROCEDURE nesting_offl_input
417	END INTERFACE nesting_offl_input
418
419	INTERFACE nesting_offl_interpolation_factor
420	MODULE PROCEDURE nesting_offl_interpolation_factor
421	END INTERFACE nesting_offl_interpolation_factor
422
423	INTERFACE nesting_offl_mass_conservation
424	MODULE PROCEDURE nesting_offl_mass_conservation
425	END INTERFACE nesting_offl_mass_conservation
426
427	INTERFACE nesting_offl_parin
428	MODULE PROCEDURE nesting_offl_parin
429	END INTERFACE nesting_offl_parin
430
431	CONTAINS
432
433	!------------------------------------------------------------------------------!
434	! Description:
435	! ------------
436	!> Reads data at lateral and top boundaries derived from larger-scale model.
437	!------------------------------------------------------------------------------!
438	SUBROUTINE nesting_offl_input
439
440	INTEGER(iwp) :: n !< running index for chemistry variables
441
442	!
443	!-- Initialize INIFOR forcing in first call.
444	IF ( .NOT. nest_offl%init ) THEN
445	#if defined ( __netcdf )
446	!
447	!-- Open file in read-only mode
448	CALL open_read_file( TRIM( input_file_dynamic ) // &
449	TRIM( coupling_char ), pids_id )
450	!
451	!-- At first, inquire all variable names.
452	CALL inquire_num_variables( pids_id, num_var_pids )
453	!
454	!-- Allocate memory to store variable names.
455	ALLOCATE( nest_offl%var_names(1:num_var_pids) )
456	CALL inquire_variable_names( pids_id, nest_offl%var_names )
457	!
458	!-- Read time dimension, allocate memory and finally read time array
459	CALL get_dimension_length( pids_id, nest_offl%nt, 'time' )
460
461	IF ( check_existence( nest_offl%var_names, 'time' ) ) THEN
462	ALLOCATE( nest_offl%time(0:nest_offl%nt-1) )
463	CALL get_variable( pids_id, 'time', nest_offl%time )
464	ENDIF
465	!
466	!-- Read vertical dimension of scalar und w grid
467	CALL get_dimension_length( pids_id, nest_offl%nzu, 'z' )
468	CALL get_dimension_length( pids_id, nest_offl%nzw, 'zw' )
469
470	IF ( check_existence( nest_offl%var_names, 'z' ) ) THEN
471	ALLOCATE( nest_offl%zu_atmos(1:nest_offl%nzu) )
472	CALL get_variable( pids_id, 'z', nest_offl%zu_atmos )
473	ENDIF
474	IF ( check_existence( nest_offl%var_names, 'zw' ) ) THEN
475	ALLOCATE( nest_offl%zw_atmos(1:nest_offl%nzw) )
476	CALL get_variable( pids_id, 'zw', nest_offl%zw_atmos )
477	ENDIF
478	!
479	!-- Read surface pressure
480	IF ( check_existence( nest_offl%var_names, &
481	'surface_forcing_surface_pressure' ) ) THEN
482	ALLOCATE( nest_offl%surface_pressure(0:nest_offl%nt-1) )
483	CALL get_variable( pids_id, &
484	'surface_forcing_surface_pressure', &
485	nest_offl%surface_pressure )
486	ENDIF
487	!
488	!-- Close input file
489	CALL close_input_file( pids_id )
490	#endif
491	ENDIF
492	!
493	!-- Check if dynamic driver data input is required.
494	IF ( nest_offl%time(nest_offl%tind_p) <= &
495	MAX( time_since_reference_point, 0.0_wp) .OR. &
496	.NOT. nest_offl%init ) THEN
497	CONTINUE
498	!
499	!-- Return otherwise
500	ELSE
501	RETURN
502	ENDIF
503	!
504	!-- CPU measurement
505	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'start' )
506
507	!
508	!-- Obtain time index for current point in time. Note, the time coordinate
509	!-- in the input file is always relative to the initial time in UTC, i.e.
510	!-- the time coordinate always starts at 0.0 even if the initial UTC is e.g.
511	!-- 7200.0. Further, since time_since_reference_point is negativ here when
512	!-- spinup is applied, use MAX function to obtain correct time index.
513	nest_offl%tind = MINLOC( ABS( nest_offl%time - &
514	MAX( time_since_reference_point, 0.0_wp) &
515	), DIM = 1 ) - 1
516	nest_offl%tind_p = nest_offl%tind + 1
517	!
518	!-- Open file in read-only mode
519	#if defined ( __netcdf )
520	CALL open_read_file( TRIM( input_file_dynamic ) // &
521	TRIM( coupling_char ), pids_id )
522	!
523	!-- Read geostrophic wind components
524	! DO t = nest_offl%tind, nest_offl%tind_p
525	! CALL get_variable_pr( pids_id, 'ls_forcing_ug', t+1, &
526	! nest_offl%ug(t-nest_offl%tind,nzb+1:nzt) )
527	! CALL get_variable_pr( pids_id, 'ls_forcing_vg', t+1, &
528	! nest_offl%vg(t-nest_offl%tind,nzb+1:nzt) )
529	! ENDDO
530	!
531	!-- Read data at lateral and top boundaries. Please note, at left and
532	!-- right domain boundary, yz-layers are read for u, v, w, pt and q.
533	!-- For the v-component, the data starts at nysv, while for the other
534	!-- quantities the data starts at nys. This is equivalent at the north
535	!-- and south domain boundary for the u-component (nxlu).
536	!-- Note, lateral data is also accessed by parallel IO, which is the reason
537	!-- why different arguments are passed depending on the boundary control
538	!-- flags. Cores that do not belong to the respective boundary only do
539	!-- a dummy read with count = 0, just in order to participate the collective
540	!-- operation. This is because collective parallel access shows better
541	!-- performance than just a conditional access.
542	!-- Read data for LOD 2, i.e. time-dependent xz-, yz-, and xy-slices.
543	IF ( lod == 2 ) THEN
544	CALL get_variable( pids_id, 'ls_forcing_left_u', &
545	nest_offl%u_l, & ! array to be read
546	MERGE( nys+1, 1, bc_dirichlet_l), & ! start index y direction
547	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
548	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
549	MERGE( nyn-nys+1, 0, bc_dirichlet_l), & ! number of elements along y
550	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements alogn z
551	MERGE( 2, 0, bc_dirichlet_l), & ! number of time steps (2 or 0)
552	.TRUE. ) ! parallel IO when compiled accordingly
553
554	CALL get_variable( pids_id, 'ls_forcing_left_v', &
555	nest_offl%v_l, &
556	MERGE( nysv, 1, bc_dirichlet_l), &
557	MERGE( nzb+1, 1, bc_dirichlet_l), &
558	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
559	MERGE( nyn-nysv+1, 0, bc_dirichlet_l), &
560	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
561	MERGE( 2, 0, bc_dirichlet_l), &
562	.TRUE. )
563
564	CALL get_variable( pids_id, 'ls_forcing_left_w', &
565	nest_offl%w_l, &
566	MERGE( nys+1, 1, bc_dirichlet_l), &
567	MERGE( nzb+1, 1, bc_dirichlet_l), &
568	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
569	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
570	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
571	MERGE( 2, 0, bc_dirichlet_l), &
572	.TRUE. )
573
574	IF ( .NOT. neutral ) THEN
575	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
576	nest_offl%pt_l, &
577	MERGE( nys+1, 1, bc_dirichlet_l), &
578	MERGE( nzb+1, 1, bc_dirichlet_l), &
579	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
580	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
581	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
582	MERGE( 2, 0, bc_dirichlet_l), &
583	.TRUE. )
584	ENDIF
585
586	IF ( humidity ) THEN
587	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
588	nest_offl%q_l, &
589	MERGE( nys+1, 1, bc_dirichlet_l), &
590	MERGE( nzb+1, 1, bc_dirichlet_l), &
591	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
592	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
593	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
594	MERGE( 2, 0, bc_dirichlet_l), &
595	.TRUE. )
596	ENDIF
597
598	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
599	DO n = 1, UBOUND(nest_offl%var_names_chem_l, 1)
600	IF ( check_existence( nest_offl%var_names, &
601	nest_offl%var_names_chem_l(n) ) ) THEN
602	CALL get_variable( pids_id, &
603	TRIM( nest_offl%var_names_chem_l(n) ), &
604	nest_offl%chem_l(:,:,:,n), &
605	MERGE( nys+1, 1, bc_dirichlet_l), &
606	MERGE( nzb+1, 1, bc_dirichlet_l), &
607	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
608	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
609	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
610	MERGE( 2, 0, bc_dirichlet_l), &
611	.TRUE. )
612	nest_offl%chem_from_file_l(n) = .TRUE.
613	ENDIF
614	ENDDO
615	ENDIF
616	!
617	!-- Read data for eastern boundary
618	CALL get_variable( pids_id, 'ls_forcing_right_u', &
619	nest_offl%u_r, &
620	MERGE( nys+1, 1, bc_dirichlet_r), &
621	MERGE( nzb+1, 1, bc_dirichlet_r), &
622	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
623	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
624	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
625	MERGE( 2, 0, bc_dirichlet_r), &
626	.TRUE. )
627
628	CALL get_variable( pids_id, 'ls_forcing_right_v', &
629	nest_offl%v_r, &
630	MERGE( nysv, 1, bc_dirichlet_r), &
631	MERGE( nzb+1, 1, bc_dirichlet_r), &
632	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
633	MERGE( nyn-nysv+1, 0, bc_dirichlet_r), &
634	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
635	MERGE( 2, 0, bc_dirichlet_r), &
636	.TRUE. )
637
638	CALL get_variable( pids_id, 'ls_forcing_right_w', &
639	nest_offl%w_r, &
640	MERGE( nys+1, 1, bc_dirichlet_r), &
641	MERGE( nzb+1, 1, bc_dirichlet_r), &
642	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
643	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
644	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
645	MERGE( 2, 0, bc_dirichlet_r), &
646	.TRUE. )
647
648	IF ( .NOT. neutral ) THEN
649	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
650	nest_offl%pt_r, &
651	MERGE( nys+1, 1, bc_dirichlet_r), &
652	MERGE( nzb+1, 1, bc_dirichlet_r), &
653	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
654	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
655	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
656	MERGE( 2, 0, bc_dirichlet_r), &
657	.TRUE. )
658	ENDIF
659
660	IF ( humidity ) THEN
661	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
662	nest_offl%q_r, &
663	MERGE( nys+1, 1, bc_dirichlet_r), &
664	MERGE( nzb+1, 1, bc_dirichlet_r), &
665	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
666	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
667	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
668	MERGE( 2, 0, bc_dirichlet_r), &
669	.TRUE. )
670	ENDIF
671
672	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
673	DO n = 1, UBOUND(nest_offl%var_names_chem_r, 1)
674	IF ( check_existence( nest_offl%var_names, &
675	nest_offl%var_names_chem_r(n) ) ) THEN
676	CALL get_variable( pids_id, &
677	TRIM( nest_offl%var_names_chem_r(n) ), &
678	nest_offl%chem_r(:,:,:,n), &
679	MERGE( nys+1, 1, bc_dirichlet_r), &
680	MERGE( nzb+1, 1, bc_dirichlet_r), &
681	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
682	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
683	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
684	MERGE( 2, 0, bc_dirichlet_r), &
685	.TRUE. )
686	nest_offl%chem_from_file_r(n) = .TRUE.
687	ENDIF
688	ENDDO
689	ENDIF
690	!
691	!-- Read data for northern boundary
692	CALL get_variable( pids_id, 'ls_forcing_north_u', &
693	nest_offl%u_n, &
694	MERGE( nxlu, 1, bc_dirichlet_n ), &
695	MERGE( nzb+1, 1, bc_dirichlet_n ), &
696	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
697	MERGE( nxr-nxlu+1, 0, bc_dirichlet_n ), &
698	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
699	MERGE( 2, 0, bc_dirichlet_n ), &
700	.TRUE. )
701
702	CALL get_variable( pids_id, 'ls_forcing_north_v', &
703	nest_offl%v_n, &
704	MERGE( nxl+1, 1, bc_dirichlet_n ), &
705	MERGE( nzb+1, 1, bc_dirichlet_n ), &
706	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
707	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
708	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
709	MERGE( 2, 0, bc_dirichlet_n ), &
710	.TRUE. )
711
712	CALL get_variable( pids_id, 'ls_forcing_north_w', &
713	nest_offl%w_n, &
714	MERGE( nxl+1, 1, bc_dirichlet_n ), &
715	MERGE( nzb+1, 1, bc_dirichlet_n ), &
716	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
717	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
718	MERGE( nest_offl%nzw, 0, bc_dirichlet_n ), &
719	MERGE( 2, 0, bc_dirichlet_n ), &
720	.TRUE. )
721
722	IF ( .NOT. neutral ) THEN
723	CALL get_variable( pids_id, 'ls_forcing_north_pt', &
724	nest_offl%pt_n, &
725	MERGE( nxl+1, 1, bc_dirichlet_n ), &
726	MERGE( nzb+1, 1, bc_dirichlet_n ), &
727	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
728	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
729	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
730	MERGE( 2, 0, bc_dirichlet_n ), &
731	.TRUE. )
732	ENDIF
733	IF ( humidity ) THEN
734	CALL get_variable( pids_id, 'ls_forcing_north_qv', &
735	nest_offl%q_n, &
736	MERGE( nxl+1, 1, bc_dirichlet_n ), &
737	MERGE( nzb+1, 1, bc_dirichlet_n ), &
738	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
739	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
740	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
741	MERGE( 2, 0, bc_dirichlet_n ), &
742	.TRUE. )
743	ENDIF
744
745	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
746	DO n = 1, UBOUND(nest_offl%var_names_chem_n, 1)
747	IF ( check_existence( nest_offl%var_names, &
748	nest_offl%var_names_chem_n(n) ) ) THEN
749	CALL get_variable( pids_id, &
750	TRIM( nest_offl%var_names_chem_n(n) ), &
751	nest_offl%chem_n(:,:,:,n), &
752	MERGE( nxl+1, 1, bc_dirichlet_n ), &
753	MERGE( nzb+1, 1, bc_dirichlet_n ), &
754	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
755	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
756	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
757	MERGE( 2, 0, bc_dirichlet_n ), &
758	.TRUE. )
759	nest_offl%chem_from_file_n(n) = .TRUE.
760	ENDIF
761	ENDDO
762	ENDIF
763	!
764	!-- Read data for southern boundary
765	CALL get_variable( pids_id, 'ls_forcing_south_u', &
766	nest_offl%u_s, &
767	MERGE( nxlu, 1, bc_dirichlet_s ), &
768	MERGE( nzb+1, 1, bc_dirichlet_s ), &
769	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
770	MERGE( nxr-nxlu+1, 0, bc_dirichlet_s ), &
771	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
772	MERGE( 2, 0, bc_dirichlet_s ), &
773	.TRUE. )
774
775	CALL get_variable( pids_id, 'ls_forcing_south_v', &
776	nest_offl%v_s, &
777	MERGE( nxl+1, 1, bc_dirichlet_s ), &
778	MERGE( nzb+1, 1, bc_dirichlet_s ), &
779	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
780	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
781	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
782	MERGE( 2, 0, bc_dirichlet_s ), &
783	.TRUE. )
784
785	CALL get_variable( pids_id, 'ls_forcing_south_w', &
786	nest_offl%w_s, &
787	MERGE( nxl+1, 1, bc_dirichlet_s ), &
788	MERGE( nzb+1, 1, bc_dirichlet_s ), &
789	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
790	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
791	MERGE( nest_offl%nzw, 0, bc_dirichlet_s ), &
792	MERGE( 2, 0, bc_dirichlet_s ), &
793	.TRUE. )
794
795	IF ( .NOT. neutral ) THEN
796	CALL get_variable( pids_id, 'ls_forcing_south_pt', &
797	nest_offl%pt_s, &
798	MERGE( nxl+1, 1, bc_dirichlet_s ), &
799	MERGE( nzb+1, 1, bc_dirichlet_s ), &
800	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
801	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
802	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
803	MERGE( 2, 0, bc_dirichlet_s ), &
804	.TRUE. )
805	ENDIF
806	IF ( humidity ) THEN
807	CALL get_variable( pids_id, 'ls_forcing_south_qv', &
808	nest_offl%q_s, &
809	MERGE( nxl+1, 1, bc_dirichlet_s ), &
810	MERGE( nzb+1, 1, bc_dirichlet_s ), &
811	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
812	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
813	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
814	MERGE( 2, 0, bc_dirichlet_s ), &
815	.TRUE. )
816	ENDIF
817
818	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
819	DO n = 1, UBOUND(nest_offl%var_names_chem_s, 1)
820	IF ( check_existence( nest_offl%var_names, &
821	nest_offl%var_names_chem_s(n) ) ) THEN
822	CALL get_variable( pids_id, &
823	TRIM( nest_offl%var_names_chem_s(n) ), &
824	nest_offl%chem_s(:,:,:,n), &
825	MERGE( nxl+1, 1, bc_dirichlet_s ), &
826	MERGE( nzb+1, 1, bc_dirichlet_s ), &
827	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
828	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
829	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
830	MERGE( 2, 0, bc_dirichlet_s ), &
831	.TRUE. )
832	nest_offl%chem_from_file_s(n) = .TRUE.
833	ENDIF
834	ENDDO
835	ENDIF
836	!
837	!-- Top boundary
838	CALL get_variable( pids_id, 'ls_forcing_top_u', &
839	nest_offl%u_top(0:1,nys:nyn,nxlu:nxr), &
840	nxlu, nys+1, nest_offl%tind+1, &
841	nxr-nxlu+1, nyn-nys+1, 2, .TRUE. )
842
843	CALL get_variable( pids_id, 'ls_forcing_top_v', &
844	nest_offl%v_top(0:1,nysv:nyn,nxl:nxr), &
845	nxl+1, nysv, nest_offl%tind+1, &
846	nxr-nxl+1, nyn-nysv+1, 2, .TRUE. )
847
848	CALL get_variable( pids_id, 'ls_forcing_top_w', &
849	nest_offl%w_top(0:1,nys:nyn,nxl:nxr), &
850	nxl+1, nys+1, nest_offl%tind+1, &
851	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
852
853	IF ( .NOT. neutral ) THEN
854	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
855	nest_offl%pt_top(0:1,nys:nyn,nxl:nxr), &
856	nxl+1, nys+1, nest_offl%tind+1, &
857	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
858	ENDIF
859	IF ( humidity ) THEN
860	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
861	nest_offl%q_top(0:1,nys:nyn,nxl:nxr), &
862	nxl+1, nys+1, nest_offl%tind+1, &
863	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
864	ENDIF
865
866	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
867	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
868	IF ( check_existence( nest_offl%var_names, &
869	nest_offl%var_names_chem_t(n) ) ) THEN
870	CALL get_variable( pids_id, &
871	TRIM( nest_offl%var_names_chem_t(n) ), &
872	nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,n), &
873	nxl+1, nys+1, nest_offl%tind+1, &
874	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
875	nest_offl%chem_from_file_t(n) = .TRUE.
876	ENDIF
877	ENDDO
878	ENDIF
879	!
880	!-- Read data for LOD 1, i.e. time-dependent profiles. In constrast to LOD 2 where the amount of
881	!-- IO is larger, only the respective boundary processes read the data.
882	ELSE
883	IF ( bc_dirichlet_l ) THEN
884	CALL get_variable( pids_id, 'ls_forcing_left_u', &
885	nest_offl%u_l(0:1,:,1:1), & ! array to be read
886	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
887	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
888	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements along z
889	MERGE( 2, 0, bc_dirichlet_l) ) ! number of time steps (2 or 0)
890	CALL get_variable( pids_id, 'ls_forcing_left_v', &
891	nest_offl%v_l(0:1,:,1:1), &
892	MERGE( nzb+1, 1, bc_dirichlet_l), &
893	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
894	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
895	MERGE( 2, 0, bc_dirichlet_l) )
896	CALL get_variable( pids_id, 'ls_forcing_left_w', &
897	nest_offl%w_l(0:1,:,1:1), &
898	MERGE( nzb+1, 1, bc_dirichlet_l), &
899	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
900	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
901	MERGE( 2, 0, bc_dirichlet_l) )
902	IF ( .NOT. neutral ) THEN
903	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
904	nest_offl%pt_l(0:1,:,1:1), &
905	MERGE( nzb+1, 1, bc_dirichlet_l), &
906	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
907	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
908	MERGE( 2, 0, bc_dirichlet_l) )
909	ENDIF
910	IF ( humidity ) THEN
911	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
912	nest_offl%q_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 ( air_chemistry .AND. nesting_offline_chem ) THEN
919	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
920	IF ( check_existence( nest_offl%var_names, &
921	nest_offl%var_names_chem_t(n) ) ) THEN
922	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
923	nest_offl%chem_l(0:1,:,1:1,n), &
924	MERGE( nzb+1, 1, bc_dirichlet_l), &
925	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
926	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
927	MERGE( 2, 0, bc_dirichlet_l) )
928	nest_offl%chem_from_file_l(n) = .TRUE.
929	ENDIF
930	ENDDO
931	ENDIF
932	ENDIF
933	IF ( bc_dirichlet_r ) THEN
934	CALL get_variable( pids_id, 'ls_forcing_right_u', &
935	nest_offl%u_r(0:1,:,1:1), &
936	MERGE( nzb+1, 1, bc_dirichlet_r), &
937	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
938	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
939	MERGE( 2, 0, bc_dirichlet_r) )
940	CALL get_variable( pids_id, 'ls_forcing_right_v', &
941	nest_offl%v_r(0:1,:,1:1), &
942	MERGE( nzb+1, 1, bc_dirichlet_r), &
943	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
944	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
945	MERGE( 2, 0, bc_dirichlet_r) )
946	CALL get_variable( pids_id, 'ls_forcing_right_w', &
947	nest_offl%w_r(0:1,:,1:1), &
948	MERGE( nzb+1, 1, bc_dirichlet_r), &
949	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
950	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
951	MERGE( 2, 0, bc_dirichlet_r) )
952	IF ( .NOT. neutral ) THEN
953	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
954	nest_offl%pt_r(0:1,:,1:1), &
955	MERGE( nzb+1, 1, bc_dirichlet_r), &
956	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
957	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
958	MERGE( 2, 0, bc_dirichlet_r) )
959	ENDIF
960	IF ( humidity ) THEN
961	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
962	nest_offl%q_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 ( air_chemistry .AND. nesting_offline_chem ) THEN
969	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
970	IF ( check_existence( nest_offl%var_names, &
971	nest_offl%var_names_chem_t(n) ) ) THEN
972	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
973	nest_offl%chem_r(0:1,:,1:1,n), &
974	MERGE( nzb+1, 1, bc_dirichlet_r), &
975	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
976	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
977	MERGE( 2, 0, bc_dirichlet_r) )
978	nest_offl%chem_from_file_r(n) = .TRUE.
979	ENDIF
980	ENDDO
981	ENDIF
982	ENDIF
983	IF ( bc_dirichlet_n ) THEN
984	CALL get_variable( pids_id, 'ls_forcing_north_u', &
985	nest_offl%u_n(0:1,:,1:1), &
986	MERGE( nzb+1, 1, bc_dirichlet_n), &
987	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
988	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
989	MERGE( 2, 0, bc_dirichlet_n) )
990	CALL get_variable( pids_id, 'ls_forcing_north_v', &
991	nest_offl%v_n(0:1,:,1:1), &
992	MERGE( nzb+1, 1, bc_dirichlet_n), &
993	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
994	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
995	MERGE( 2, 0, bc_dirichlet_n) )
996	CALL get_variable( pids_id, 'ls_forcing_north_w', &
997	nest_offl%w_n(0:1,:,1:1), &
998	MERGE( nzb+1, 1, bc_dirichlet_n), &
999	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1000	MERGE( nest_offl%nzw, 0, bc_dirichlet_n), &
1001	MERGE( 2, 0, bc_dirichlet_n) )
1002	IF ( .NOT. neutral ) THEN
1003	CALL get_variable( pids_id, 'ls_forcing_north_pt', &
1004	nest_offl%pt_n(0:1,:,1:1), &
1005	MERGE( nzb+1, 1, bc_dirichlet_n), &
1006	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1007	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1008	MERGE( 2, 0, bc_dirichlet_n) )
1009	ENDIF
1010	IF ( humidity ) THEN
1011	CALL get_variable( pids_id, 'ls_forcing_north_qv', &
1012	nest_offl%q_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 ( air_chemistry .AND. nesting_offline_chem ) THEN
1019	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
1020	IF ( check_existence( nest_offl%var_names, &
1021	nest_offl%var_names_chem_t(n) ) ) THEN
1022	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1023	nest_offl%chem_n(0:1,:,1:1,n), &
1024	MERGE( nzb+1, 1, bc_dirichlet_n), &
1025	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n), &
1026	MERGE( nest_offl%nzu, 0, bc_dirichlet_n), &
1027	MERGE( 2, 0, bc_dirichlet_n) )
1028	nest_offl%chem_from_file_n(n) = .TRUE.
1029	ENDIF
1030	ENDDO
1031	ENDIF
1032	ENDIF
1033	IF ( bc_dirichlet_s ) THEN
1034	CALL get_variable( pids_id, 'ls_forcing_south_u', &
1035	nest_offl%u_s(0:1,:,1:1), &
1036	MERGE( nzb+1, 1, bc_dirichlet_s), &
1037	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1038	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1039	MERGE( 2, 0, bc_dirichlet_s) )
1040	CALL get_variable( pids_id, 'ls_forcing_south_v', &
1041	nest_offl%v_s(0:1,:,1:1), &
1042	MERGE( nzb+1, 1, bc_dirichlet_s), &
1043	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1044	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1045	MERGE( 2, 0, bc_dirichlet_s) )
1046	CALL get_variable( pids_id, 'ls_forcing_south_w', &
1047	nest_offl%w_s(0:1,:,1:1), &
1048	MERGE( nzb+1, 1, bc_dirichlet_s), &
1049	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1050	MERGE( nest_offl%nzw, 0, bc_dirichlet_s), &
1051	MERGE( 2, 0, bc_dirichlet_s) )
1052	IF ( .NOT. neutral ) THEN
1053	CALL get_variable( pids_id, 'ls_forcing_south_pt', &
1054	nest_offl%pt_s(0:1,:,1:1), &
1055	MERGE( nzb+1, 1, bc_dirichlet_s), &
1056	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1057	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1058	MERGE( 2, 0, bc_dirichlet_s) )
1059	ENDIF
1060	IF ( humidity ) THEN
1061	CALL get_variable( pids_id, 'ls_forcing_south_qv', &
1062	nest_offl%q_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 ( air_chemistry .AND. nesting_offline_chem ) THEN
1069	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
1070	IF ( check_existence( nest_offl%var_names, &
1071	nest_offl%var_names_chem_t(n) ) ) THEN
1072	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1073	nest_offl%chem_s(0:1,:,1:1,n), &
1074	MERGE( nzb+1, 1, bc_dirichlet_s), &
1075	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s), &
1076	MERGE( nest_offl%nzu, 0, bc_dirichlet_s), &
1077	MERGE( 2, 0, bc_dirichlet_s) )
1078	nest_offl%chem_from_file_s(n) = .TRUE.
1079	ENDIF
1080	ENDDO
1081	ENDIF
1082	ENDIF
1083	!
1084	!-- Read top boundary data, which is actually only a scalar value in the LOD 1 case.
1085	CALL get_variable( pids_id, 'ls_forcing_top_u', &
1086	nest_offl%u_top(0:1,1,1), & ! array to be read
1087	nest_offl%tind+1, & ! start index in time
1088	2 ) ! number of elements to be read
1089	CALL get_variable( pids_id, 'ls_forcing_top_v', &
1090	nest_offl%v_top(0:1,1,1), &
1091	nest_offl%tind+1, &
1092	2 )
1093	CALL get_variable( pids_id, 'ls_forcing_top_w', &
1094	nest_offl%w_top(0:1,1,1), &
1095	nest_offl%tind+1, &
1096	2 )
1097	IF ( .NOT. neutral ) THEN
1098	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
1099	nest_offl%pt_top(0:1,1,1), &
1100	nest_offl%tind+1, &
1101	2 )
1102	ENDIF
1103	IF ( humidity ) THEN
1104	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
1105	nest_offl%q_top(0:1,1,1), &
1106	nest_offl%tind+1, &
1107	2 )
1108	ENDIF
1109	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1110	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
1111	IF ( check_existence( nest_offl%var_names, &
1112	nest_offl%var_names_chem_t(n) ) ) THEN
1113	CALL get_variable( pids_id, TRIM( nest_offl%var_names_chem_t(n) ), &
1114	nest_offl%chem_top(0:1,1,1,n), &
1115	nest_offl%tind+1, &
1116	2 )
1117	nest_offl%chem_from_file_t(n) = .TRUE.
1118	ENDIF
1119	ENDDO
1120	ENDIF
1121	ENDIF
1122
1123
1124	!
1125	!-- Close input file
1126	CALL close_input_file( pids_id )
1127	#endif
1128	!
1129	!-- Set control flag to indicate that boundary data has been initially
1130	!-- input.
1131	nest_offl%init = .TRUE.
1132	!
1133	!-- Call offline nesting for salsa
1134	IF ( salsa ) CALL salsa_nesting_offl_input
1135	!
1136	!-- End of CPU measurement
1137	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'stop' )
1138
1139	END SUBROUTINE nesting_offl_input
1140
1141
1142	!------------------------------------------------------------------------------!
1143	! Description:
1144	! ------------
1145	!> In this subroutine a constant mass within the model domain is guaranteed.
1146	!> Larger-scale models may be based on a compressible equation system, which is
1147	!> not consistent with PALMs incompressible equation system. In order to avoid
1148	!> a decrease or increase of mass during the simulation, non-divergent flow
1149	!> through the lateral and top boundaries is compensated by the vertical wind
1150	!> component at the top boundary.
1151	!------------------------------------------------------------------------------!
1152	SUBROUTINE nesting_offl_mass_conservation
1153
1154	INTEGER(iwp) :: i !< grid index in x-direction
1155	INTEGER(iwp) :: j !< grid index in y-direction
1156	INTEGER(iwp) :: k !< grid index in z-direction
1157
1158	REAL(wp) :: d_area_t !< inverse of the total area of the horizontal model domain
1159	REAL(wp) :: w_correct !< vertical velocity increment required to compensate non-divergent flow through the boundaries
1160	REAL(wp), DIMENSION(1:3) :: volume_flow_l !< local volume flow
1161
1162
1163	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'start' )
1164
1165	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
1166
1167	volume_flow = 0.0_wp
1168	volume_flow_l = 0.0_wp
1169
1170	d_area_t = 1.0_wp / ( ( nx + 1 ) * dx * ( ny + 1 ) * dy )
1171
1172	IF ( bc_dirichlet_l ) THEN
1173	i = nxl
1174	DO j = nys, nyn
1175	DO k = nzb+1, nzt
1176	volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) * dy &
1177	* rho_air(k) &
1178	* MERGE( 1.0_wp, 0.0_wp, &
1179	BTEST( wall_flags_total_0(k,j,i), 1 ) )
1180	ENDDO
1181	ENDDO
1182	ENDIF
1183	IF ( bc_dirichlet_r ) THEN
1184	i = nxr+1
1185	DO j = nys, nyn
1186	DO k = nzb+1, nzt
1187	volume_flow_l(1) = volume_flow_l(1) - u(k,j,i) * dzw(k) * dy &
1188	* rho_air(k) &
1189	* MERGE( 1.0_wp, 0.0_wp, &
1190	BTEST( wall_flags_total_0(k,j,i), 1 ) )
1191	ENDDO
1192	ENDDO
1193	ENDIF
1194	IF ( bc_dirichlet_s ) THEN
1195	j = nys
1196	DO i = nxl, nxr
1197	DO k = nzb+1, nzt
1198	volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) * dx &
1199	* rho_air(k) &
1200	* MERGE( 1.0_wp, 0.0_wp, &
1201	BTEST( wall_flags_total_0(k,j,i), 2 ) )
1202	ENDDO
1203	ENDDO
1204	ENDIF
1205	IF ( bc_dirichlet_n ) THEN
1206	j = nyn+1
1207	DO i = nxl, nxr
1208	DO k = nzb+1, nzt
1209	volume_flow_l(2) = volume_flow_l(2) - v(k,j,i) * dzw(k) * dx &
1210	* rho_air(k) &
1211	* MERGE( 1.0_wp, 0.0_wp, &
1212	BTEST( wall_flags_total_0(k,j,i), 2 ) )
1213	ENDDO
1214	ENDDO
1215	ENDIF
1216	!
1217	!-- Top boundary
1218	k = nzt
1219	DO i = nxl, nxr
1220	DO j = nys, nyn
1221	volume_flow_l(3) = volume_flow_l(3) - rho_air_zw(k) * w(k,j,i) * dx * dy
1222	ENDDO
1223	ENDDO
1224
1225	#if defined( __parallel )
1226	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
1227	CALL MPI_ALLREDUCE( volume_flow_l, volume_flow, 3, MPI_REAL, MPI_SUM, &
1228	comm2d, ierr )
1229	#else
1230	volume_flow = volume_flow_l
1231	#endif
1232
1233	w_correct = SUM( volume_flow ) * d_area_t * drho_air_zw(nzt)
1234
1235	DO i = nxl, nxr
1236	DO j = nys, nyn
1237	DO k = nzt, nzt + 1
1238	w(k,j,i) = w(k,j,i) + w_correct &
1239	* MERGE( 1.0_wp, 0.0_wp, &
1240	BTEST( wall_flags_total_0(k,j,i), 3 ) )
1241	ENDDO
1242	ENDDO
1243	ENDDO
1244
1245	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
1246
1247	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'end' )
1248
1249	END SUBROUTINE nesting_offl_mass_conservation
1250
1251
1252	!------------------------------------------------------------------------------!
1253	! Description:
1254	! ------------
1255	!> Set the lateral and top boundary conditions in case the PALM domain is
1256	!> nested offline in a mesoscale model. Further, average boundary data and
1257	!> determine mean profiles, further used for correct damping in the sponge
1258	!> layer.
1259	!------------------------------------------------------------------------------!
1260	SUBROUTINE nesting_offl_bc
1261
1262	USE exchange_horiz_mod, &
1263	ONLY: exchange_horiz
1264
1265	INTEGER(iwp) :: i !< running index x-direction
1266	INTEGER(iwp) :: j !< running index y-direction
1267	INTEGER(iwp) :: k !< running index z-direction
1268	INTEGER(iwp) :: n !< running index for chemical species
1269
1270	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref !< reference profile for potential temperature
1271	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref_l !< reference profile for potential temperature on subdomain
1272	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref !< reference profile for mixing ratio
1273	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref_l !< reference profile for mixing ratio on subdomain
1274	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref !< reference profile for u-component
1275	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref_l !< reference profile for u-component on subdomain
1276	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref !< reference profile for v-component
1277	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref_l !< reference profile for v-component on subdomain
1278	REAL(wp), DIMENSION(nzb:nzt+1) :: var_1d !< pre-interpolated profile for LOD1 mode
1279
1280	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem !< reference profile for chemical species
1281	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem_l !< reference profile for chemical species on subdomain
1282
1283	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'start' )
1284
1285	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
1286	!
1287	!-- Initialize mean profiles, derived from boundary data, to zero.
1288	pt_ref = 0.0_wp
1289	q_ref = 0.0_wp
1290	u_ref = 0.0_wp
1291	v_ref = 0.0_wp
1292
1293	pt_ref_l = 0.0_wp
1294	q_ref_l = 0.0_wp
1295	u_ref_l = 0.0_wp
1296	v_ref_l = 0.0_wp
1297	!
1298	!-- If required, allocate temporary arrays to compute chemistry mean profiles
1299	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1300	ALLOCATE( ref_chem(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
1301	ALLOCATE( ref_chem_l(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
1302	ref_chem = 0.0_wp
1303	ref_chem_l = 0.0_wp
1304	ENDIF
1305	!
1306	!-- Set boundary conditions of u-, v-, w-component, as well as q, and pt.
1307	!-- Note, boundary values at the left boundary: i=-1 (v,w,pt,q) and
1308	!-- i=0 (u), at the right boundary: i=nxr+1 (all), at the south boundary:
1309	!-- j=-1 (u,w,pt,q) and j=0 (v), at the north boundary: j=nyn+1 (all).
1310	!-- Please note, at the left (for u) and south (for v) boundary, values
1311	!-- for u and v are set also at i/j=-1, since these values are used in
1312	!-- boundary_conditions() to restore prognostic values.
1313	!-- Further, sum up data to calculate mean profiles from boundary data,
1314	!-- used for Rayleigh damping.
1315	IF ( bc_dirichlet_l ) THEN
1316	!
1317	!-- u-component
1318	IF ( lod == 2 ) THEN
1319	DO j = nys, nyn
1320	DO k = nzb+1, nzt
1321	u(k,j,i_bound_u) = interpolate_in_time( nest_offl%u_l(0,k,j), &
1322	nest_offl%u_l(1,k,j), &
1323	fac_dt ) * &
1324	MERGE( 1.0_wp, 0.0_wp, &
1325	BTEST( wall_flags_total_0(k,j,i_bound_u), 1 ) )
1326	ENDDO
1327	u(:,j,i_bound_u-1) = u(:,j,i_bound_u)
1328	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1329	ENDDO
1330	ELSE
1331	!
1332	!-- Pre-interpolate profile before mapping onto the boundaries.
1333	DO k = nzb+1, nzt
1334	var_1d(k) = interpolate_in_time( nest_offl%u_l(0,k,1), &
1335	nest_offl%u_l(1,k,1), &
1336	fac_dt )
1337	ENDDO
1338	DO j = nys, nyn
1339	u(nzb+1:nzt,j,i_bound_u) = var_1d(nzb+1:nzt) * &
1340	MERGE( 1.0_wp, 0.0_wp, &
1341	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound_u), 1 ) )
1342	u(:,j,i_bound_u-1) = u(:,j,i_bound_u)
1343	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1344	ENDDO
1345	ENDIF
1346	!
1347	!-- w-component
1348	IF ( lod == 2 ) THEN
1349	DO j = nys, nyn
1350	DO k = nzb+1, nzt-1
1351	w(k,j,i_bound) = interpolate_in_time( nest_offl%w_l(0,k,j), &
1352	nest_offl%w_l(1,k,j), &
1353	fac_dt ) * &
1354	MERGE( 1.0_wp, 0.0_wp, &
1355	BTEST( wall_flags_total_0(k,j,i_bound), 3 ) )
1356	ENDDO
1357	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1358	ENDDO
1359	ELSE
1360	DO k = nzb+1, nzt-1
1361	var_1d(k) = interpolate_in_time( nest_offl%w_l(0,k,1), &
1362	nest_offl%w_l(1,k,1), &
1363	fac_dt )
1364	ENDDO
1365	DO j = nys, nyn
1366	w(nzb+1:nzt-1,j,i_bound) = var_1d(nzb+1:nzt-1) * &
1367	MERGE( 1.0_wp, 0.0_wp, &
1368	BTEST( wall_flags_total_0(nzb+1:nzt-1,j,i_bound), 3 ) )
1369	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1370	ENDDO
1371	ENDIF
1372	!
1373	!-- v-component
1374	IF ( lod == 2 ) THEN
1375	DO j = nysv, nyn
1376	DO k = nzb+1, nzt
1377	v(k,j,i_bound) = interpolate_in_time( nest_offl%v_l(0,k,j), &
1378	nest_offl%v_l(1,k,j), &
1379	fac_dt ) * &
1380	MERGE( 1.0_wp, 0.0_wp, &
1381	BTEST( wall_flags_total_0(k,j,i_bound), 2 ) )
1382	ENDDO
1383	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1384	ENDDO
1385	ELSE
1386	DO k = nzb+1, nzt
1387	var_1d(k) = interpolate_in_time( nest_offl%v_l(0,k,1), &
1388	nest_offl%v_l(1,k,1), &
1389	fac_dt )
1390	ENDDO
1391	DO j = nysv, nyn
1392	v(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt) * &
1393	MERGE( 1.0_wp, 0.0_wp, &
1394	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound), 2 ) )
1395	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1396	ENDDO
1397	ENDIF
1398	!
1399	!-- potential temperature
1400	IF ( .NOT. neutral ) THEN
1401	IF ( lod == 2 ) THEN
1402	DO j = nys, nyn
1403	DO k = nzb+1, nzt
1404	pt(k,j,i_bound) = interpolate_in_time( nest_offl%pt_l(0,k,j), &
1405	nest_offl%pt_l(1,k,j), &
1406	fac_dt )
1407	ENDDO
1408	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1409	ENDDO
1410	ELSE
1411	DO k = nzb+1, nzt
1412	var_1d(k) = interpolate_in_time( nest_offl%pt_l(0,k,1), &
1413	nest_offl%pt_l(1,k,1), &
1414	fac_dt )
1415	ENDDO
1416	DO j = nys, nyn
1417	pt(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1418	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1419	ENDDO
1420	ENDIF
1421	ENDIF
1422	!
1423	!-- humidity
1424	IF ( humidity ) THEN
1425	IF ( lod == 2 ) THEN
1426	DO j = nys, nyn
1427	DO k = nzb+1, nzt
1428	q(k,j,i_bound) = interpolate_in_time( nest_offl%q_l(0,k,j), &
1429	nest_offl%q_l(1,k,j), &
1430	fac_dt )
1431	ENDDO
1432	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1433	ENDDO
1434	ELSE
1435	DO k = nzb+1, nzt
1436	var_1d(k) = interpolate_in_time( nest_offl%q_l(0,k,1), &
1437	nest_offl%q_l(1,k,1), &
1438	fac_dt )
1439	ENDDO
1440	DO j = nys, nyn
1441	q(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1442	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1443	ENDDO
1444	ENDIF
1445	ENDIF
1446	!
1447	!-- chemistry
1448	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1449	DO n = 1, UBOUND( chem_species, 1 )
1450	IF ( nest_offl%chem_from_file_l(n) ) THEN
1451	IF ( lod == 2 ) THEN
1452	DO j = nys, nyn
1453	DO k = nzb+1, nzt
1454	chem_species(n)%conc(k,j,i_bound) = interpolate_in_time( &
1455	nest_offl%chem_l(0,k,j,n), &
1456	nest_offl%chem_l(1,k,j,n), &
1457	fac_dt )
1458	ENDDO
1459	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1460	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1461	ENDDO
1462	ELSE
1463	DO k = nzb+1, nzt
1464	var_1d(k) = interpolate_in_time( nest_offl%chem_l(0,k,1,n), &
1465	nest_offl%chem_l(1,k,1,n), &
1466	fac_dt )
1467	ENDDO
1468	DO j = nys, nyn
1469	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1470	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1471	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1472	ENDDO
1473	ENDIF
1474	ENDIF
1475	ENDDO
1476	ENDIF
1477
1478	ENDIF
1479
1480	IF ( bc_dirichlet_r ) THEN
1481	!
1482	!-- u-component
1483	IF ( lod == 2 ) THEN
1484	DO j = nys, nyn
1485	DO k = nzb+1, nzt
1486	u(k,j,i_bound_u) = interpolate_in_time( nest_offl%u_r(0,k,j), &
1487	nest_offl%u_r(1,k,j), &
1488	fac_dt ) * &
1489	MERGE( 1.0_wp, 0.0_wp, &
1490	BTEST( wall_flags_total_0(k,j,i_bound_u), 1 ) )
1491	ENDDO
1492	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1493	ENDDO
1494	ELSE
1495	DO k = nzb+1, nzt
1496	var_1d(k) = interpolate_in_time( nest_offl%u_r(0,k,1), &
1497	nest_offl%u_r(1,k,1), &
1498	fac_dt )
1499	ENDDO
1500	DO j = nys, nyn
1501	u(nzb+1:nzt,j,i_bound_u) = var_1d(nzb+1:nzt) * &
1502	MERGE( 1.0_wp, 0.0_wp, &
1503	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound_u), 1 ) )
1504	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,i_bound_u)
1505	ENDDO
1506	ENDIF
1507	!
1508	!-- w-component
1509	IF ( lod == 2 ) THEN
1510	DO j = nys, nyn
1511	DO k = nzb+1, nzt-1
1512	w(k,j,i_bound) = interpolate_in_time( nest_offl%w_r(0,k,j), &
1513	nest_offl%w_r(1,k,j), &
1514	fac_dt ) * &
1515	MERGE( 1.0_wp, 0.0_wp, &
1516	BTEST( wall_flags_total_0(k,j,i_bound), 3 ) )
1517	ENDDO
1518	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1519	ENDDO
1520	ELSE
1521	DO k = nzb+1, nzt-1
1522	var_1d(k) = interpolate_in_time( nest_offl%w_r(0,k,1), &
1523	nest_offl%w_r(1,k,1), &
1524	fac_dt )
1525	ENDDO
1526	DO j = nys, nyn
1527	w(nzb+1:nzt-1,j,i_bound) = var_1d(nzb+1:nzt-1) * &
1528	MERGE( 1.0_wp, 0.0_wp, &
1529	BTEST( wall_flags_total_0(nzb+1:nzt-1,j,i_bound), 3 ) )
1530	w(nzt,j,i_bound) = w(nzt-1,j,i_bound)
1531	ENDDO
1532	ENDIF
1533	!
1534	!-- v-component
1535	IF ( lod == 2 ) THEN
1536	DO j = nysv, nyn
1537	DO k = nzb+1, nzt
1538	v(k,j,i_bound) = interpolate_in_time( nest_offl%v_r(0,k,j), &
1539	nest_offl%v_r(1,k,j), &
1540	fac_dt ) * &
1541	MERGE( 1.0_wp, 0.0_wp, &
1542	BTEST( wall_flags_total_0(k,j,i_bound), 2 ) )
1543	ENDDO
1544	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1545	ENDDO
1546	ELSE
1547	DO k = nzb+1, nzt
1548	var_1d(k) = interpolate_in_time( nest_offl%v_r(0,k,1), &
1549	nest_offl%v_r(1,k,1), &
1550	fac_dt )
1551	ENDDO
1552	DO j = nysv, nyn
1553	v(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt) * &
1554	MERGE( 1.0_wp, 0.0_wp, &
1555	BTEST( wall_flags_total_0(nzb+1:nzt,j,i_bound), 2 ) )
1556	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,i_bound)
1557	ENDDO
1558	ENDIF
1559	!
1560	!-- potential temperature
1561	IF ( .NOT. neutral ) THEN
1562	IF ( lod == 2 ) THEN
1563	DO j = nys, nyn
1564	DO k = nzb+1, nzt
1565	pt(k,j,i_bound) = interpolate_in_time( nest_offl%pt_r(0,k,j), &
1566	nest_offl%pt_r(1,k,j), &
1567	fac_dt )
1568	ENDDO
1569	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1570	ENDDO
1571	ELSE
1572	DO k = nzb+1, nzt
1573	var_1d(k) = interpolate_in_time( nest_offl%pt_r(0,k,1), &
1574	nest_offl%pt_r(1,k,1), &
1575	fac_dt )
1576	ENDDO
1577	DO j = nys, nyn
1578	pt(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1579	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,i_bound)
1580	ENDDO
1581	ENDIF
1582	ENDIF
1583	!
1584	!-- humidity
1585	IF ( humidity ) THEN
1586	IF ( lod == 2 ) THEN
1587	DO j = nys, nyn
1588	DO k = nzb+1, nzt
1589	q(k,j,i_bound) = interpolate_in_time( nest_offl%q_r(0,k,j), &
1590	nest_offl%q_r(1,k,j), &
1591	fac_dt )
1592	ENDDO
1593	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1594	ENDDO
1595	ELSE
1596	DO k = nzb+1, nzt
1597	var_1d(k) = interpolate_in_time( nest_offl%q_r(0,k,1), &
1598	nest_offl%q_r(1,k,1), &
1599	fac_dt )
1600	ENDDO
1601	DO j = nys, nyn
1602	q(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1603	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,i_bound)
1604	ENDDO
1605	ENDIF
1606	ENDIF
1607	!
1608	!-- chemistry
1609	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1610	DO n = 1, UBOUND( chem_species, 1 )
1611	IF ( nest_offl%chem_from_file_r(n) ) THEN
1612	IF ( lod == 2 ) THEN
1613	DO j = nys, nyn
1614	DO k = nzb+1, nzt
1615	chem_species(n)%conc(k,j,i_bound) = interpolate_in_time( &
1616	nest_offl%chem_r(0,k,j,n), &
1617	nest_offl%chem_r(1,k,j,n), &
1618	fac_dt )
1619	ENDDO
1620	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1621	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1622	ENDDO
1623	ELSE
1624	DO k = nzb+1, nzt
1625	var_1d(k) = interpolate_in_time( nest_offl%chem_r(0,k,1,n), &
1626	nest_offl%chem_r(1,k,1,n), &
1627	fac_dt )
1628	ENDDO
1629	DO j = nys, nyn
1630	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = var_1d(nzb+1:nzt)
1631	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1632	+ chem_species(n)%conc(nzb+1:nzt,j,i_bound)
1633	ENDDO
1634	ENDIF
1635	ENDIF
1636	ENDDO
1637	ENDIF
1638
1639	ENDIF
1640
1641	IF ( bc_dirichlet_n ) THEN
1642	!
1643	!-- v-component
1644	IF ( lod == 2 ) THEN
1645	DO i = nxl, nxr
1646	DO k = nzb+1, nzt
1647	v(k,j_bound_v,i) = interpolate_in_time( nest_offl%v_n(0,k,i), &
1648	nest_offl%v_n(1,k,i), &
1649	fac_dt ) * &
1650	MERGE( 1.0_wp, 0.0_wp, &
1651	BTEST( wall_flags_total_0(k,j_bound_v,i), 2 ) )
1652	ENDDO
1653	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1654	ENDDO
1655	ELSE
1656	DO k = nzb+1, nzt
1657	var_1d(k) = interpolate_in_time( nest_offl%v_n(0,k,1), &
1658	nest_offl%v_n(1,k,1), &
1659	fac_dt )
1660	ENDDO
1661	DO i = nxl, nxr
1662	v(nzb+1:nzt,j_bound_v,i) = var_1d(nzb+1:nzt) * &
1663	MERGE( 1.0_wp, 0.0_wp, &
1664	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound_v,i), 2 ) )
1665	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1666	ENDDO
1667	ENDIF
1668	!
1669	!-- w-component
1670	IF ( lod == 2 ) THEN
1671	DO i = nxl, nxr
1672	DO k = nzb+1, nzt-1
1673	w(k,j_bound,i) = interpolate_in_time( nest_offl%w_n(0,k,i), &
1674	nest_offl%w_n(1,k,i), &
1675	fac_dt ) * &
1676	MERGE( 1.0_wp, 0.0_wp, &
1677	BTEST( wall_flags_total_0(k,j_bound,i), 3 ) )
1678	ENDDO
1679	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1680	ENDDO
1681	ELSE
1682	DO k = nzb+1, nzt-1
1683	var_1d(k) = interpolate_in_time( nest_offl%w_n(0,k,1), &
1684	nest_offl%w_n(1,k,1), &
1685	fac_dt )
1686	ENDDO
1687	DO i = nxl, nxr
1688	w(nzb+1:nzt-1,j_bound,i) = var_1d(nzb+1:nzt-1) * &
1689	MERGE( 1.0_wp, 0.0_wp, &
1690	BTEST( wall_flags_total_0(nzb+1:nzt-1,j_bound,i), 3 ) )
1691	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1692	ENDDO
1693	ENDIF
1694	!
1695	!-- u-component
1696	IF ( lod == 2 ) THEN
1697	DO i = nxlu, nxr
1698	DO k = nzb+1, nzt
1699	u(k,j_bound,i) = interpolate_in_time( nest_offl%u_n(0,k,i), &
1700	nest_offl%u_n(1,k,i), &
1701	fac_dt ) * &
1702	MERGE( 1.0_wp, 0.0_wp, &
1703	BTEST( wall_flags_total_0(k,j_bound,i), 1 ) )
1704	ENDDO
1705	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1706	ENDDO
1707	ELSE
1708	DO k = nzb+1, nzt
1709	var_1d(k) = interpolate_in_time( nest_offl%u_n(0,k,1), &
1710	nest_offl%u_n(1,k,1), &
1711	fac_dt )
1712	ENDDO
1713	DO i = nxlu, nxr
1714	u(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt) * &
1715	MERGE( 1.0_wp, 0.0_wp, &
1716	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound,i), 1 ) )
1717	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1718	ENDDO
1719	ENDIF
1720	!
1721	!-- potential temperature
1722	IF ( .NOT. neutral ) THEN
1723	IF ( lod == 2 ) THEN
1724	DO i = nxl, nxr
1725	DO k = nzb+1, nzt
1726	pt(k,j_bound,i) = interpolate_in_time( nest_offl%pt_n(0,k,i), &
1727	nest_offl%pt_n(1,k,i), &
1728	fac_dt )
1729	ENDDO
1730	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1731	ENDDO
1732	ELSE
1733	DO k = nzb+1, nzt
1734	var_1d(k) = interpolate_in_time( nest_offl%pt_n(0,k,1), &
1735	nest_offl%pt_n(1,k,1), &
1736	fac_dt )
1737	ENDDO
1738	DO i = nxl, nxr
1739	pt(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1740	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1741	ENDDO
1742	ENDIF
1743	ENDIF
1744	!
1745	!-- humidity
1746	IF ( humidity ) THEN
1747	IF ( lod == 2 ) THEN
1748	DO i = nxl, nxr
1749	DO k = nzb+1, nzt
1750	q(k,j_bound,i) = interpolate_in_time( nest_offl%q_n(0,k,i), &
1751	nest_offl%q_n(1,k,i), &
1752	fac_dt )
1753	ENDDO
1754	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1755	ENDDO
1756	ELSE
1757	DO k = nzb+1, nzt
1758	var_1d(k) = interpolate_in_time( nest_offl%q_n(0,k,1), &
1759	nest_offl%q_n(1,k,1), &
1760	fac_dt )
1761	ENDDO
1762	DO i = nxl, nxr
1763	q(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1764	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1765	ENDDO
1766	ENDIF
1767	ENDIF
1768	!
1769	!-- chemistry
1770	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1771	DO n = 1, UBOUND( chem_species, 1 )
1772	IF ( nest_offl%chem_from_file_n(n) ) THEN
1773	IF ( lod == 2 ) THEN
1774	DO i = nxl, nxr
1775	DO k = nzb+1, nzt
1776	chem_species(n)%conc(k,j_bound,i) = interpolate_in_time( &
1777	nest_offl%chem_n(0,k,i,n), &
1778	nest_offl%chem_n(1,k,i,n), &
1779	fac_dt )
1780	ENDDO
1781	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1782	+ chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1783	ENDDO
1784	ELSE
1785	DO k = nzb+1, nzt
1786	var_1d(k) = interpolate_in_time( nest_offl%chem_n(0,k,1,n), &
1787	nest_offl%chem_n(1,k,1,n), &
1788	fac_dt )
1789	ENDDO
1790	DO i = nxl, nxr
1791	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1792	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) + &
1793	chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1794	ENDDO
1795	ENDIF
1796	ENDIF
1797	ENDDO
1798	ENDIF
1799	ENDIF
1800
1801	IF ( bc_dirichlet_s ) THEN
1802	!
1803	!-- v-component
1804	IF ( lod == 2 ) THEN
1805	DO i = nxl, nxr
1806	DO k = nzb+1, nzt
1807	v(k,j_bound_v,i) = interpolate_in_time( nest_offl%v_s(0,k,i), &
1808	nest_offl%v_s(1,k,i), &
1809	fac_dt ) * &
1810	MERGE( 1.0_wp, 0.0_wp, &
1811	BTEST( wall_flags_total_0(k,j_bound_v,i), 2 ) )
1812	ENDDO
1813	v(:,j_bound_v-1,i) = v(:,j_bound_v,i)
1814	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1815	ENDDO
1816	ELSE
1817	DO k = nzb+1, nzt
1818	var_1d(k) = interpolate_in_time( nest_offl%v_s(0,k,1), &
1819	nest_offl%v_s(1,k,1), &
1820	fac_dt )
1821	ENDDO
1822	DO i = nxl, nxr
1823	v(nzb+1:nzt,j_bound_v,i) = var_1d(nzb+1:nzt) * &
1824	MERGE( 1.0_wp, 0.0_wp, &
1825	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound_v,i), 2 ) )
1826	v(:,j_bound_v-1,i) = v(:,j_bound_v,i)
1827	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j_bound_v,i)
1828	ENDDO
1829	ENDIF
1830	!
1831	!-- w-component
1832	IF ( lod == 2 ) THEN
1833	DO i = nxl, nxr
1834	DO k = nzb+1, nzt-1
1835	w(k,j_bound,i) = interpolate_in_time( nest_offl%w_s(0,k,i), &
1836	nest_offl%w_s(1,k,i), &
1837	fac_dt ) * &
1838	MERGE( 1.0_wp, 0.0_wp, &
1839	BTEST( wall_flags_total_0(k,j_bound,i), 3 ) )
1840	ENDDO
1841	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1842	ENDDO
1843	ELSE
1844	DO k = nzb+1, nzt-1
1845	var_1d(k) = interpolate_in_time( nest_offl%w_s(0,k,1), &
1846	nest_offl%w_s(1,k,1), &
1847	fac_dt )
1848	ENDDO
1849	DO i = nxl, nxr
1850	w(nzb+1:nzt-1,j_bound,i) = var_1d(nzb+1:nzt-1) * &
1851	MERGE( 1.0_wp, 0.0_wp, &
1852	BTEST( wall_flags_total_0(nzb+1:nzt-1,j_bound,i), 3 ) )
1853	w(nzt,j_bound,i) = w(nzt-1,j_bound,i)
1854	ENDDO
1855	ENDIF
1856	!
1857	!-- u-component
1858	IF ( lod == 2 ) THEN
1859	DO i = nxlu, nxr
1860	DO k = nzb+1, nzt
1861	u(k,j_bound,i) = interpolate_in_time( nest_offl%u_s(0,k,i), &
1862	nest_offl%u_s(1,k,i), &
1863	fac_dt ) * &
1864	MERGE( 1.0_wp, 0.0_wp, &
1865	BTEST( wall_flags_total_0(k,j_bound,i), 1 ) )
1866	ENDDO
1867	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1868	ENDDO
1869	ELSE
1870	DO k = nzb+1, nzt
1871	var_1d(k) = interpolate_in_time( nest_offl%u_s(0,k,1), &
1872	nest_offl%u_s(1,k,1), &
1873	fac_dt )
1874	ENDDO
1875	DO i = nxlu, nxr
1876	u(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt) * &
1877	MERGE( 1.0_wp, 0.0_wp, &
1878	BTEST( wall_flags_total_0(nzb+1:nzt,j_bound,i), 1 ) )
1879	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j_bound,i)
1880	ENDDO
1881	ENDIF
1882	!
1883	!-- potential temperature
1884	IF ( .NOT. neutral ) THEN
1885	IF ( lod == 2 ) THEN
1886	DO i = nxl, nxr
1887	DO k = nzb+1, nzt
1888	pt(k,j_bound,i) = interpolate_in_time( nest_offl%pt_s(0,k,i), &
1889	nest_offl%pt_s(1,k,i), &
1890	fac_dt )
1891	ENDDO
1892	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1893	ENDDO
1894	ELSE
1895	DO k = nzb+1, nzt
1896	var_1d(k) = interpolate_in_time( nest_offl%pt_s(0,k,1), &
1897	nest_offl%pt_s(1,k,1), &
1898	fac_dt )
1899	ENDDO
1900	DO i = nxl, nxr
1901	pt(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1902	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j_bound,i)
1903	ENDDO
1904	ENDIF
1905	ENDIF
1906	!
1907	!-- humidity
1908	IF ( humidity ) THEN
1909	IF ( lod == 2 ) THEN
1910	DO i = nxl, nxr
1911	DO k = nzb+1, nzt
1912	q(k,j_bound,i) = interpolate_in_time( nest_offl%q_s(0,k,i), &
1913	nest_offl%q_s(1,k,i), &
1914	fac_dt )
1915	ENDDO
1916	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1917	ENDDO
1918	ELSE
1919	DO k = nzb+1, nzt
1920	var_1d(k) = interpolate_in_time( nest_offl%q_s(0,k,1), &
1921	nest_offl%q_s(1,k,1), &
1922	fac_dt )
1923	ENDDO
1924	DO i = nxl, nxr
1925	q(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1926	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j_bound,i)
1927	ENDDO
1928	ENDIF
1929	ENDIF
1930	!
1931	!-- chemistry
1932	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
1933	DO n = 1, UBOUND( chem_species, 1 )
1934	IF ( nest_offl%chem_from_file_s(n) ) THEN
1935	IF ( lod == 2 ) THEN
1936	DO i = nxl, nxr
1937	DO k = nzb+1, nzt
1938	chem_species(n)%conc(k,j_bound,i) = interpolate_in_time( &
1939	nest_offl%chem_s(0,k,i,n), &
1940	nest_offl%chem_s(1,k,i,n), &
1941	fac_dt )
1942	ENDDO
1943	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
1944	+ chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1945	ENDDO
1946	ELSE
1947	DO k = nzb+1, nzt
1948	var_1d(k) = interpolate_in_time( nest_offl%chem_s(0,k,1,n), &
1949	nest_offl%chem_s(1,k,1,n), &
1950	fac_dt )
1951	ENDDO
1952	DO i = nxl, nxr
1953	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = var_1d(nzb+1:nzt)
1954	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) + &
1955	chem_species(n)%conc(nzb+1:nzt,j_bound,i)
1956	ENDDO
1957	ENDIF
1958	ENDIF
1959	ENDDO
1960	ENDIF
1961	ENDIF
1962	!
1963	!-- Top boundary
1964	!-- u-component
1965	IF ( lod == 2 ) THEN
1966	DO i = nxlu, nxr
1967	DO j = nys, nyn
1968	u(nzt+1,j,i) = interpolate_in_time( nest_offl%u_top(0,j,i), &
1969	nest_offl%u_top(1,j,i), &
1970	fac_dt ) * &
1971	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt+1,j,i), 1 ) )
1972	u_ref_l(nzt+1) = u_ref_l(nzt+1) + u(nzt+1,j,i)
1973	ENDDO
1974	ENDDO
1975	ELSE
1976	var_1d(nzt+1) = interpolate_in_time( nest_offl%u_top(0,1,1), &
1977	nest_offl%u_top(1,1,1), &
1978	fac_dt )
1979	u(nzt+1,nys:nyn,nxlu:nxr) = var_1d(nzt+1) * &
1980	MERGE( 1.0_wp, 0.0_wp, &
1981	BTEST( wall_flags_total_0(nzt+1,nys:nyn,nxlu:nxr), 1 ) )
1982	u_ref_l(nzt+1) = u_ref_l(nzt+1) + SUM( u(nzt+1,nys:nyn,nxlu:nxr) )
1983	ENDIF
1984	!
1985	!-- For left boundary set boundary condition for u-component also at top
1986	!-- grid point.
1987	!-- Note, this has no effect on the numeric solution, only for data output.
1988	IF ( bc_dirichlet_l ) u(nzt+1,:,nxl) = u(nzt+1,:,nxlu)
1989	!
1990	!-- v-component
1991	IF ( lod == 2 ) THEN
1992	DO i = nxl, nxr
1993	DO j = nysv, nyn
1994	v(nzt+1,j,i) = interpolate_in_time( nest_offl%v_top(0,j,i), &
1995	nest_offl%v_top(1,j,i), &
1996	fac_dt ) * &
1997	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt+1,j,i), 2 ) )
1998	v_ref_l(nzt+1) = v_ref_l(nzt+1) + v(nzt+1,j,i)
1999	ENDDO
2000	ENDDO
2001	ELSE
2002	var_1d(nzt+1) = interpolate_in_time( nest_offl%v_top(0,1,1), &
2003	nest_offl%v_top(1,1,1), &
2004	fac_dt )
2005	v(nzt+1,nysv:nyn,nxl:nxr) = var_1d(nzt+1) * &
2006	MERGE( 1.0_wp, 0.0_wp, &
2007	BTEST( wall_flags_total_0(nzt+1,nysv:nyn,nxl:nxr), 2 ) )
2008	v_ref_l(nzt+1) = v_ref_l(nzt+1) + SUM( v(nzt+1,nysv:nyn,nxl:nxr) )
2009	ENDIF
2010	!
2011	!-- For south boundary set boundary condition for v-component also at top
2012	!-- grid point.
2013	!-- Note, this has no effect on the numeric solution, only for data output.
2014	IF ( bc_dirichlet_s ) v(nzt+1,nys,:) = v(nzt+1,nysv,:)
2015	!
2016	!-- w-component
2017	IF ( lod == 2 ) THEN
2018	DO i = nxl, nxr
2019	DO j = nys, nyn
2020	w(nzt,j,i) = interpolate_in_time( nest_offl%w_top(0,j,i), &
2021	nest_offl%w_top(1,j,i), &
2022	fac_dt ) * &
2023	MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(nzt,j,i), 3 ) )
2024	w(nzt+1,j,i) = w(nzt,j,i)
2025	ENDDO
2026	ENDDO
2027	ELSE
2028	var_1d(nzt) = interpolate_in_time( nest_offl%w_top(0,1,1), &
2029	nest_offl%w_top(1,1,1), &
2030	fac_dt )
2031	w(nzt,nys:nyn,nxl:nxr) = var_1d(nzt) * &
2032	MERGE( 1.0_wp, 0.0_wp, &
2033	BTEST( wall_flags_total_0(nzt,nys:nyn,nxl:nxr), 3 ) )
2034	w(nzt+1,nys:nyn,nxl:nxr) = w(nzt,nys:nyn,nxl:nxr)
2035	ENDIF
2036	!
2037	!-- potential temperture
2038	IF ( .NOT. neutral ) THEN
2039	IF ( lod == 2 ) THEN
2040	DO i = nxl, nxr
2041	DO j = nys, nyn
2042	pt(nzt+1,j,i) = interpolate_in_time( nest_offl%pt_top(0,j,i), &
2043	nest_offl%pt_top(1,j,i), &
2044	fac_dt )
2045	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + pt(nzt+1,j,i)
2046	ENDDO
2047	ENDDO
2048	ELSE
2049	var_1d(nzt+1) = interpolate_in_time( nest_offl%pt_top(0,1,1), &
2050	nest_offl%pt_top(1,1,1), &
2051	fac_dt )
2052	pt(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2053	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + SUM( pt(nzt+1,nys:nyn,nxl:nxr) )
2054	ENDIF
2055	ENDIF
2056	!
2057	!-- humidity
2058	IF ( humidity ) THEN
2059	IF ( lod == 2 ) THEN
2060	DO i = nxl, nxr
2061	DO j = nys, nyn
2062	q(nzt+1,j,i) = interpolate_in_time( nest_offl%q_top(0,j,i), &
2063	nest_offl%q_top(1,j,i), &
2064	fac_dt )
2065	q_ref_l(nzt+1) = q_ref_l(nzt+1) + q(nzt+1,j,i)
2066	ENDDO
2067	ENDDO
2068	ELSE
2069	var_1d(nzt+1) = interpolate_in_time( nest_offl%q_top(0,1,1), &
2070	nest_offl%q_top(1,1,1), &
2071	fac_dt )
2072	q(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2073	q_ref_l(nzt+1) = q_ref_l(nzt+1) + SUM( q(nzt+1,nys:nyn,nxl:nxr) )
2074	ENDIF
2075	ENDIF
2076
2077	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2078	DO n = 1, UBOUND( chem_species, 1 )
2079	IF ( nest_offl%chem_from_file_t(n) ) THEN
2080	IF ( lod == 2 ) THEN
2081	DO i = nxl, nxr
2082	DO j = nys, nyn
2083	chem_species(n)%conc(nzt+1,j,i) = interpolate_in_time( &
2084	nest_offl%chem_top(0,j,i,n), &
2085	nest_offl%chem_top(1,j,i,n), &
2086	fac_dt )
2087	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + &
2088	chem_species(n)%conc(nzt+1,j,i)
2089	ENDDO
2090	ENDDO
2091	ELSE
2092	var_1d(nzt+1) = interpolate_in_time( nest_offl%chem_top(0,1,1,n), &
2093	nest_offl%chem_top(1,1,1,n), &
2094	fac_dt )
2095	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = var_1d(nzt+1)
2096	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + &
2097	SUM( chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) )
2098	ENDIF
2099	ENDIF
2100	ENDDO
2101	ENDIF
2102	!
2103	!-- Moreover, set Neumann boundary condition for subgrid-scale TKE,
2104	!-- passive scalar, dissipation, and chemical species if required
2105	IF ( rans_mode .AND. rans_tke_e ) THEN
2106	IF ( bc_dirichlet_l ) diss(:,:,nxl-1) = diss(:,:,nxl)
2107	IF ( bc_dirichlet_r ) diss(:,:,nxr+1) = diss(:,:,nxr)
2108	IF ( bc_dirichlet_s ) diss(:,nys-1,:) = diss(:,nys,:)
2109	IF ( bc_dirichlet_n ) diss(:,nyn+1,:) = diss(:,nyn,:)
2110	ENDIF
2111	! IF ( .NOT. constant_diffusion ) THEN
2112	! IF ( bc_dirichlet_l ) e(:,:,nxl-1) = e(:,:,nxl)
2113	! IF ( bc_dirichlet_r ) e(:,:,nxr+1) = e(:,:,nxr)
2114	! IF ( bc_dirichlet_s ) e(:,nys-1,:) = e(:,nys,:)
2115	! IF ( bc_dirichlet_n ) e(:,nyn+1,:) = e(:,nyn,:)
2116	! e(nzt+1,:,:) = e(nzt,:,:)
2117	! ENDIF
2118	! IF ( passive_scalar ) THEN
2119	! IF ( bc_dirichlet_l ) s(:,:,nxl-1) = s(:,:,nxl)
2120	! IF ( bc_dirichlet_r ) s(:,:,nxr+1) = s(:,:,nxr)
2121	! IF ( bc_dirichlet_s ) s(:,nys-1,:) = s(:,nys,:)
2122	! IF ( bc_dirichlet_n ) s(:,nyn+1,:) = s(:,nyn,:)
2123	! ENDIF
2124
2125	CALL exchange_horiz( u, nbgp )
2126	CALL exchange_horiz( v, nbgp )
2127	CALL exchange_horiz( w, nbgp )
2128	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
2129	IF ( humidity ) CALL exchange_horiz( q, nbgp )
2130	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2131	DO n = 1, UBOUND( chem_species, 1 )
2132	!
2133	!-- Do local exchange only when necessary, i.e. when data is coming
2134	!-- from dynamic file.
2135	IF ( nest_offl%chem_from_file_t(n) ) CALL exchange_horiz( chem_species(n)%conc, nbgp )
2136	ENDDO
2137	ENDIF
2138	!
2139	!-- Set top boundary condition at all horizontal grid points, also at the
2140	!-- lateral boundary grid points.
2141	w(nzt+1,:,:) = w(nzt,:,:)
2142	!
2143	!-- Offline nesting for salsa
2144	IF ( salsa ) CALL salsa_nesting_offl_bc
2145	!
2146	!-- Calculate the mean profiles. These are later stored on u_init, v_init,
2147	!-- etc., in order to adjust the Rayleigh damping under time-evolving atmospheric conditions
2148	!-- accordingly - damping against the representative mean profiles, not against the initial
2149	!-- profiles. Note, in LOD = 1 case no averaging is required.
2150	#if defined( __parallel )
2151	CALL MPI_ALLREDUCE( u_ref_l, u_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2152	CALL MPI_ALLREDUCE( v_ref_l, v_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2153	IF ( humidity ) THEN
2154	CALL MPI_ALLREDUCE( q_ref_l, q_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2155	ENDIF
2156	IF ( .NOT. neutral ) THEN
2157	CALL MPI_ALLREDUCE( pt_ref_l, pt_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, comm2d, ierr )
2158	ENDIF
2159	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2160	CALL MPI_ALLREDUCE( ref_chem_l, ref_chem, ( nzt+1-nzb+1 ) * SIZE( ref_chem(nzb,:) ), &
2161	MPI_REAL, MPI_SUM, comm2d, ierr )
2162	ENDIF
2163	#else
2164	u_ref = u_ref_l
2165	v_ref = v_ref_l
2166	IF ( humidity ) q_ref = q_ref_l
2167	IF ( .NOT. neutral ) pt_ref = pt_ref_l
2168	IF ( air_chemistry .AND. nesting_offline_chem ) ref_chem = ref_chem_l
2169	#endif
2170	!
2171	!-- Average data. Note, reference profiles up to nzt are derived from lateral
2172	!-- boundaries, at the model top it is derived from the top boundary. Thus,
2173	!-- number of input data is different from nzb:nzt compared to nzt+1.
2174	!-- Derived from lateral boundaries.
2175	u_ref(nzb:nzt) = u_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx ), KIND = wp )
2176	v_ref(nzb:nzt) = v_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + nx + 1 ), KIND = wp )
2177	IF ( humidity ) &
2178	q_ref(nzb:nzt) = q_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2179	IF ( .NOT. neutral ) &
2180	pt_ref(nzb:nzt) = pt_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2181	IF ( air_chemistry .AND. nesting_offline_chem ) &
2182	ref_chem(nzb:nzt,:) = ref_chem(nzb:nzt,:) / REAL( 2.0_wp * ( ny + 1 + nx + 1 ), KIND = wp )
2183	!
2184	!-- Derived from top boundary.
2185	u_ref(nzt+1) = u_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx ), KIND = wp )
2186	v_ref(nzt+1) = v_ref(nzt+1) / REAL( ( ny ) * ( nx + 1 ), KIND = wp )
2187	IF ( humidity ) &
2188	q_ref(nzt+1) = q_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), KIND = wp )
2189	IF ( .NOT. neutral ) &
2190	pt_ref(nzt+1) = pt_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), KIND = wp )
2191	IF ( air_chemistry .AND. nesting_offline_chem ) &
2192	ref_chem(nzt+1,:) = ref_chem(nzt+1,:) / REAL( ( ny + 1 ) * ( nx + 1 ),KIND = wp )
2193	!
2194	!-- Write onto init profiles, which are used for damping. Also set lower
2195	!-- boundary condition for scalars (not required for u and v as these are
2196	!-- zero at k=nzb.
2197	u_init = u_ref
2198	v_init = v_ref
2199	IF ( humidity ) THEN
2200	q_init = q_ref
2201	q_init(nzb) = q_init(nzb+1)
2202	ENDIF
2203	IF ( .NOT. neutral ) THEN
2204	pt_init = pt_ref
2205	pt_init(nzb) = pt_init(nzb+1)
2206	ENDIF
2207
2208	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2209	DO n = 1, UBOUND( chem_species, 1 )
2210	IF ( nest_offl%chem_from_file_t(n) ) THEN
2211	chem_species(n)%conc_pr_init(:) = ref_chem(:,n)
2212	chem_species(n)%conc_pr_init(nzb) = chem_species(n)%conc_pr_init(nzb+1)
2213	ENDIF
2214	ENDDO
2215	ENDIF
2216	IF ( ALLOCATED( ref_chem ) ) DEALLOCATE( ref_chem )
2217	IF ( ALLOCATED( ref_chem_l ) ) DEALLOCATE( ref_chem_l )
2218	!
2219	!-- Further, adjust Rayleigh damping height in case of time-changing conditions.
2220	!-- Therefore, calculate boundary-layer depth first.
2221	CALL nesting_offl_calc_zi
2222	CALL adjust_sponge_layer
2223
2224	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
2225
2226	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'end' )
2227
2228
2229	END SUBROUTINE nesting_offl_bc
2230
2231	!------------------------------------------------------------------------------!
2232	! Description:
2233	!------------------------------------------------------------------------------!
2234	!> Update of the geostrophic wind components. Note, currently this routine is
2235	!> not invoked.
2236	!------------------------------------------------------------------------------!
2237	SUBROUTINE nesting_offl_geostrophic_wind
2238
2239	INTEGER(iwp) :: k
2240	!
2241	!-- Update geostrophic wind components from dynamic input file.
2242	DO k = nzb+1, nzt
2243	ug(k) = interpolate_in_time( nest_offl%ug(0,k), nest_offl%ug(1,k), &
2244	fac_dt )
2245	vg(k) = interpolate_in_time( nest_offl%vg(0,k), nest_offl%vg(1,k), &
2246	fac_dt )
2247	ENDDO
2248	ug(nzt+1) = ug(nzt)
2249	vg(nzt+1) = vg(nzt)
2250
2251	END SUBROUTINE nesting_offl_geostrophic_wind
2252
2253	!------------------------------------------------------------------------------!
2254	! Description:
2255	!------------------------------------------------------------------------------!
2256	!> Determine the interpolation constant for time interpolation. The
2257	!> calculation is separated from the nesting_offl_bc and
2258	!> nesting_offl_geostrophic_wind in order to be independent on the order
2259	!> of calls.
2260	!------------------------------------------------------------------------------!
2261	SUBROUTINE nesting_offl_interpolation_factor
2262	!
2263	!-- Determine interpolation factor and limit it to 1. This is because
2264	!-- t+dt can slightly exceed time(tind_p) before boundary data is updated
2265	!-- again.
2266	fac_dt = ( time_since_reference_point &
2267	- nest_offl%time(nest_offl%tind) + dt_3d ) / &
2268	( nest_offl%time(nest_offl%tind_p) - nest_offl%time(nest_offl%tind) )
2269
2270	fac_dt = MIN( 1.0_wp, fac_dt )
2271
2272	END SUBROUTINE nesting_offl_interpolation_factor
2273
2274	!------------------------------------------------------------------------------!
2275	! Description:
2276	!------------------------------------------------------------------------------!
2277	!> Calculates the boundary-layer depth from the boundary data, according to
2278	!> bulk-Richardson criterion.
2279	!------------------------------------------------------------------------------!
2280	SUBROUTINE nesting_offl_calc_zi
2281
2282	INTEGER(iwp) :: i !< loop index in x-direction
2283	INTEGER(iwp) :: j !< loop index in y-direction
2284	INTEGER(iwp) :: k !< loop index in z-direction
2285	INTEGER(iwp) :: k_max_loc !< index of maximum wind speed along z-direction
2286	INTEGER(iwp) :: k_surface !< topography top index in z-direction
2287	INTEGER(iwp) :: num_boundary_gp_non_cyclic !< number of non-cyclic boundaries, used for averaging ABL depth
2288	INTEGER(iwp) :: num_boundary_gp_non_cyclic_l !< number of non-cyclic boundaries, used for averaging ABL depth
2289
2290	REAL(wp) :: ri_bulk !< bulk Richardson number
2291	REAL(wp) :: ri_bulk_crit = 0.25_wp !< critical bulk Richardson number
2292	REAL(wp) :: topo_max !< maximum topography level in model domain
2293	REAL(wp) :: topo_max_l !< maximum topography level in subdomain
2294	REAL(wp) :: vpt_surface !< near-surface virtual potential temperature
2295	REAL(wp) :: zi_l !< mean boundary-layer depth on subdomain
2296	REAL(wp) :: zi_local !< local boundary-layer depth
2297
2298	REAL(wp), DIMENSION(nzb:nzt+1) :: vpt_col !< vertical profile of virtual potential temperature at (j,i)-grid point
2299	REAL(wp), DIMENSION(nzb:nzt+1) :: uv_abs !< vertical profile of horizontal wind speed at (j,i)-grid point
2300
2301
2302	!
2303	!-- Calculate mean boundary-layer height from boundary data.
2304	!-- Start with the left and right boundaries.
2305	zi_l = 0.0_wp
2306	num_boundary_gp_non_cyclic_l = 0
2307	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2308	!
2309	!-- Sum-up and store number of boundary grid points used for averaging
2310	!-- ABL depth
2311	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + &
2312	nxr - nxl + 1
2313	!
2314	!-- Determine index along x. Please note, index indicates boundary
2315	!-- grid point for scalars.
2316	i = MERGE( -1, nxr + 1, bc_dirichlet_l )
2317
2318	DO j = nys, nyn
2319	!
2320	!-- Determine topography top index at current (j,i) index
2321	k_surface = topo_top_ind(j,i,0)
2322	!
2323	!-- Pre-compute surface virtual temperature. Therefore, use 2nd
2324	!-- prognostic level according to Heinze et al. (2017).
2325	IF ( humidity ) THEN
2326	vpt_surface = pt(k_surface+2,j,i) * &
2327	( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
2328	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
2329	ELSE
2330	vpt_surface = pt(k_surface+2,j,i)
2331	vpt_col = pt(:,j,i)
2332	ENDIF
2333	!
2334	!-- Calculate local boundary layer height from bulk Richardson number,
2335	!-- i.e. the height where the bulk Richardson number exceeds its
2336	!-- critical value of 0.25 (according to Heinze et al., 2017).
2337	!-- Note, no interpolation of u- and v-component is made, as both
2338	!-- are mainly mean inflow profiles with very small spatial variation.
2339	!-- Add a safety factor in case the velocity term becomes zero. This
2340	!-- may happen if overhanging 3D structures are directly located at
2341	!-- the boundary, where velocity inside the building is zero
2342	!-- (k_surface is the index of the lowest upward-facing surface).
2343	uv_abs(:) = SQRT( MERGE( u(:,j,i+1), u(:,j,i), &
2344	bc_dirichlet_l )**2 + &
2345	v(:,j,i)**2 )
2346	!
2347	!-- Determine index of the maximum wind speed
2348	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
2349
2350	zi_local = 0.0_wp
2351	DO k = k_surface+1, nzt
2352	ri_bulk = zu(k) * g / vpt_surface * &
2353	( vpt_col(k) - vpt_surface ) / &
2354	( uv_abs(k) + 1E-5_wp )
2355	!
2356	!-- Check if critical Richardson number is exceeded. Further, check
2357	!-- if there is a maxium in the wind profile in order to detect also
2358	!-- ABL heights in the stable boundary layer.
2359	IF ( zi_local == 0.0_wp .AND. &
2360	( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
2361	zi_local = zu(k)
2362	ENDDO
2363	!
2364	!-- Assure that the minimum local boundary-layer depth is at least at
2365	!-- the second vertical grid level.
2366	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
2367
2368	ENDDO
2369
2370	ENDIF
2371	!
2372	!-- Do the same at the north and south boundaries.
2373	IF ( bc_dirichlet_s .OR. bc_dirichlet_n ) THEN
2374
2375	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + &
2376	nxr - nxl + 1
2377
2378	j = MERGE( -1, nyn + 1, bc_dirichlet_s )
2379
2380	DO i = nxl, nxr
2381	k_surface = topo_top_ind(j,i,0)
2382
2383	IF ( humidity ) THEN
2384	vpt_surface = pt(k_surface+2,j,i) * &
2385	( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
2386	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
2387	ELSE
2388	vpt_surface = pt(k_surface+2,j,i)
2389	vpt_col = pt(:,j,i)
2390	ENDIF
2391
2392	uv_abs(:) = SQRT( u(:,j,i)**2 + &
2393	MERGE( v(:,j+1,i), v(:,j,i), &
2394	bc_dirichlet_s )**2 )
2395	!
2396	!-- Determine index of the maximum wind speed
2397	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
2398
2399	zi_local = 0.0_wp
2400	DO k = k_surface+1, nzt
2401	ri_bulk = zu(k) * g / vpt_surface * &
2402	( vpt_col(k) - vpt_surface ) / &
2403	( uv_abs(k) + 1E-5_wp )
2404	!
2405	!-- Check if critical Richardson number is exceeded. Further, check
2406	!-- if there is a maxium in the wind profile in order to detect also
2407	!-- ABL heights in the stable boundary layer.
2408	IF ( zi_local == 0.0_wp .AND. &
2409	( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
2410	zi_local = zu(k)
2411	ENDDO
2412	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
2413
2414	ENDDO
2415
2416	ENDIF
2417
2418	#if defined( __parallel )
2419	CALL MPI_ALLREDUCE( zi_l, zi_ribulk, 1, MPI_REAL, MPI_SUM, &
2420	comm2d, ierr )
2421	CALL MPI_ALLREDUCE( num_boundary_gp_non_cyclic_l, &
2422	num_boundary_gp_non_cyclic, &
2423	1, MPI_INTEGER, MPI_SUM, comm2d, ierr )
2424	#else
2425	zi_ribulk = zi_l
2426	num_boundary_gp_non_cyclic = num_boundary_gp_non_cyclic_l
2427	#endif
2428	zi_ribulk = zi_ribulk / REAL( num_boundary_gp_non_cyclic, KIND = wp )
2429	!
2430	!-- Finally, check if boundary layer depth is not below the any topography.
2431	!-- zi_ribulk will be used to adjust rayleigh damping height, i.e. the
2432	!-- lower level of the sponge layer, as well as to adjust the synthetic
2433	!-- turbulence generator accordingly. If Rayleigh damping would be applied
2434	!-- near buildings, etc., this would spoil the simulation results.
2435	topo_max_l = zw(MAXVAL( topo_top_ind(nys:nyn,nxl:nxr,0) ))
2436
2437	#if defined( __parallel )
2438	CALL MPI_ALLREDUCE( topo_max_l, topo_max, 1, MPI_REAL, MPI_MAX, &
2439	comm2d, ierr )
2440	#else
2441	topo_max = topo_max_l
2442	#endif
2443	! zi_ribulk = MAX( zi_ribulk, topo_max )
2444
2445	END SUBROUTINE nesting_offl_calc_zi
2446
2447
2448	!------------------------------------------------------------------------------!
2449	! Description:
2450	!------------------------------------------------------------------------------!
2451	!> Adjust the height where the rayleigh damping starts, i.e. the lower level
2452	!> of the sponge layer.
2453	!------------------------------------------------------------------------------!
2454	SUBROUTINE adjust_sponge_layer
2455
2456	INTEGER(iwp) :: k !< loop index in z-direction
2457
2458	REAL(wp) :: rdh !< updated Rayleigh damping height
2459
2460
2461	IF ( rayleigh_damping_height > 0.0_wp .AND. &
2462	rayleigh_damping_factor > 0.0_wp ) THEN
2463	!
2464	!-- Update Rayleigh-damping height and re-calculate height-depending
2465	!-- damping coefficients.
2466	!-- Assure that rayleigh damping starts well above the boundary layer.
2467	rdh = MIN( MAX( zi_ribulk * 1.3_wp, 10.0_wp * dz(1) ), &
2468	0.8_wp * zu(nzt), rayleigh_damping_height )
2469	!
2470	!-- Update Rayleigh damping factor
2471	DO k = nzb+1, nzt
2472	IF ( zu(k) >= rdh ) THEN
2473	rdf(k) = rayleigh_damping_factor * &
2474	( SIN( pi * 0.5_wp * ( zu(k) - rdh ) &
2475	/ ( zu(nzt) - rdh ) ) &
2476	)**2
2477	ENDIF
2478	ENDDO
2479	rdf_sc = rdf
2480
2481	ENDIF
2482
2483	END SUBROUTINE adjust_sponge_layer
2484
2485	!------------------------------------------------------------------------------!
2486	! Description:
2487	! ------------
2488	!> Performs consistency checks
2489	!------------------------------------------------------------------------------!
2490	SUBROUTINE nesting_offl_check_parameters
2491	!
2492	!-- Check if offline nesting is applied in nested child domain.
2493	IF ( nesting_offline .AND. child_domain ) THEN
2494	message_string = 'Offline nesting is only applicable in root model.'
2495	CALL message( 'offline_nesting_check_parameters', 'PA0622', 1, 2, 0, 6, 0 )
2496	ENDIF
2497
2498	END SUBROUTINE nesting_offl_check_parameters
2499
2500	!------------------------------------------------------------------------------!
2501	! Description:
2502	! ------------
2503	!> Reads the parameter list nesting_offl_parameters
2504	!------------------------------------------------------------------------------!
2505	SUBROUTINE nesting_offl_parin
2506
2507	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
2508
2509
2510	NAMELIST /nesting_offl_parameters/ nesting_offline
2511
2512	line = ' '
2513
2514	!
2515	!-- Try to find stg package
2516	REWIND ( 11 )
2517	line = ' '
2518	DO WHILE ( INDEX( line, '&nesting_offl_parameters' ) == 0 )
2519	READ ( 11, '(A)', END=20 ) line
2520	ENDDO
2521	BACKSPACE ( 11 )
2522
2523	!
2524	!-- Read namelist
2525	READ ( 11, nesting_offl_parameters, ERR = 10, END = 20 )
2526
2527	GOTO 20
2528
2529	10 BACKSPACE( 11 )
2530	READ( 11 , '(A)') line
2531	CALL parin_fail_message( 'nesting_offl_parameters', line )
2532
2533	20 CONTINUE
2534
2535
2536	END SUBROUTINE nesting_offl_parin
2537
2538	!------------------------------------------------------------------------------!
2539	! Description:
2540	! ------------
2541	!> Writes information about offline nesting into HEADER file
2542	!------------------------------------------------------------------------------!
2543	SUBROUTINE nesting_offl_header ( io )
2544
2545	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
2546
2547	WRITE ( io, 1 )
2548	IF ( nesting_offline ) THEN
2549	WRITE ( io, 3 )
2550	ELSE
2551	WRITE ( io, 2 )
2552	ENDIF
2553
2554	1 FORMAT (//' Offline nesting in COSMO model:'/ &
2555	' -------------------------------'/)
2556	2 FORMAT (' --> No offlince nesting is used (default) ')
2557	3 FORMAT (' --> Offlince nesting is used. Boundary data is read from dynamic input file ')
2558
2559	END SUBROUTINE nesting_offl_header
2560
2561	!------------------------------------------------------------------------------!
2562	! Description:
2563	! ------------
2564	!> Allocate arrays used to read boundary data from NetCDF file and initialize
2565	!> boundary data.
2566	!------------------------------------------------------------------------------!
2567	SUBROUTINE nesting_offl_init
2568
2569	INTEGER(iwp) :: i !< loop index for x-direction
2570	INTEGER(iwp) :: j !< loop index for y-direction
2571	INTEGER(iwp) :: n !< running index for chemical species
2572
2573	!
2574	!-- Before arrays for the boundary data are allocated, the LOD of the dynamic input data
2575	!-- at the boundaries is read.
2576	#if defined ( __netcdf )
2577	!
2578	!-- Open file in read-only mode
2579	CALL open_read_file( TRIM( input_file_dynamic ) // TRIM( coupling_char ), pids_id )
2580	!
2581	!-- Read attributes for LOD. In order to gurantee that also older drivers, where attribute is not given,
2582	!-- are working, do not abort the run but assume LOD2 forcing.
2583	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_pt, .FALSE., 'ls_forcing_left_pt', .FALSE. )
2584	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_qv, .FALSE., 'ls_forcing_left_qv', .FALSE. )
2585	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_u, .FALSE., 'ls_forcing_left_u', .FALSE. )
2586	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_v, .FALSE., 'ls_forcing_left_v', .FALSE. )
2587	CALL get_attribute( pids_id, char_lod, nest_offl%lod_east_w, .FALSE., 'ls_forcing_left_w', .FALSE. )
2588
2589	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_pt, .FALSE., 'ls_forcing_north_pt', .FALSE. )
2590	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_qv, .FALSE., 'ls_forcing_north_qv', .FALSE. )
2591	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_u, .FALSE., 'ls_forcing_north_u', .FALSE. )
2592	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_v, .FALSE., 'ls_forcing_north_v', .FALSE. )
2593	CALL get_attribute( pids_id, char_lod, nest_offl%lod_north_w, .FALSE., 'ls_forcing_north_w', .FALSE. )
2594
2595	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_pt, .FALSE., 'ls_forcing_south_pt', .FALSE. )
2596	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_qv, .FALSE., 'ls_forcing_south_qv', .FALSE. )
2597	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_u, .FALSE., 'ls_forcing_south_u', .FALSE. )
2598	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_v, .FALSE., 'ls_forcing_south_v', .FALSE. )
2599	CALL get_attribute( pids_id, char_lod, nest_offl%lod_south_w, .FALSE., 'ls_forcing_south_w', .FALSE. )
2600
2601	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_pt, .FALSE., 'ls_forcing_right_pt', .FALSE. )
2602	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_qv, .FALSE., 'ls_forcing_right_qv', .FALSE. )
2603	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_u, .FALSE., 'ls_forcing_right_u', .FALSE. )
2604	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_v, .FALSE., 'ls_forcing_right_v', .FALSE. )
2605	CALL get_attribute( pids_id, char_lod, nest_offl%lod_west_w, .FALSE., 'ls_forcing_right_w', .FALSE. )
2606
2607	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_pt, .FALSE., 'ls_forcing_top_pt', .FALSE. )
2608	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_qv, .FALSE., 'ls_forcing_top_qv', .FALSE. )
2609	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_u, .FALSE., 'ls_forcing_top_u', .FALSE. )
2610	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_v, .FALSE., 'ls_forcing_top_v', .FALSE. )
2611	CALL get_attribute( pids_id, char_lod, nest_offl%lod_top_w, .FALSE., 'ls_forcing_top_w', .FALSE. )
2612
2613	CALL close_input_file( pids_id )
2614	#endif
2615	!
2616	!-- Temporary workaround until most of the dynamic drivers contain a LOD attribute. So far INIFOR
2617	!-- did not provide the LOD attribute. In order to still use these older dynamic drivers, provide
2618	!-- a temporary workaround. If the LOD is not given, a NetCDF interal error will occur but the simulation
2619	!-- will not be aborted since the no_abort flag is passed. However, the respective attribute value
2620	!-- might be given an arbitrary number. Hence, check for valid LOD's and manually set them to LOD 2
2621	!-- (as assumed so far). Note, this workaround should be removed later (date of reference: 6. Oct. 2020).
2622	IF ( nest_offl%lod_east_pt /= 1 .AND. nest_offl%lod_east_pt /= 2 ) nest_offl%lod_east_pt = 2
2623	IF ( nest_offl%lod_east_qv /= 1 .AND. nest_offl%lod_east_qv /= 2 ) nest_offl%lod_east_qv = 2
2624	IF ( nest_offl%lod_east_u /= 1 .AND. nest_offl%lod_east_u /= 2 ) nest_offl%lod_east_u = 2
2625	IF ( nest_offl%lod_east_v /= 1 .AND. nest_offl%lod_east_v /= 2 ) nest_offl%lod_east_v = 2
2626	IF ( nest_offl%lod_east_w /= 1 .AND. nest_offl%lod_east_w /= 2 ) nest_offl%lod_east_w = 2
2627
2628	IF ( nest_offl%lod_north_pt /= 1 .AND. nest_offl%lod_north_pt /= 2 ) nest_offl%lod_north_pt = 2
2629	IF ( nest_offl%lod_north_qv /= 1 .AND. nest_offl%lod_north_qv /= 2 ) nest_offl%lod_north_qv = 2
2630	IF ( nest_offl%lod_north_u /= 1 .AND. nest_offl%lod_north_u /= 2 ) nest_offl%lod_north_u = 2
2631	IF ( nest_offl%lod_north_v /= 1 .AND. nest_offl%lod_north_v /= 2 ) nest_offl%lod_north_v = 2
2632	IF ( nest_offl%lod_north_w /= 1 .AND. nest_offl%lod_north_w /= 2 ) nest_offl%lod_north_w = 2
2633
2634	IF ( nest_offl%lod_south_pt /= 1 .AND. nest_offl%lod_south_pt /= 2 ) nest_offl%lod_south_pt = 2
2635	IF ( nest_offl%lod_south_qv /= 1 .AND. nest_offl%lod_south_qv /= 2 ) nest_offl%lod_south_qv = 2
2636	IF ( nest_offl%lod_south_u /= 1 .AND. nest_offl%lod_south_u /= 2 ) nest_offl%lod_south_u = 2
2637	IF ( nest_offl%lod_south_v /= 1 .AND. nest_offl%lod_south_v /= 2 ) nest_offl%lod_south_v = 2
2638	IF ( nest_offl%lod_south_w /= 1 .AND. nest_offl%lod_south_w /= 2 ) nest_offl%lod_south_w = 2
2639
2640	IF ( nest_offl%lod_west_pt /= 1 .AND. nest_offl%lod_west_pt /= 2 ) nest_offl%lod_west_pt = 2
2641	IF ( nest_offl%lod_west_qv /= 1 .AND. nest_offl%lod_west_qv /= 2 ) nest_offl%lod_west_qv = 2
2642	IF ( nest_offl%lod_west_u /= 1 .AND. nest_offl%lod_west_u /= 2 ) nest_offl%lod_west_u = 2
2643	IF ( nest_offl%lod_west_v /= 1 .AND. nest_offl%lod_west_v /= 2 ) nest_offl%lod_west_v = 2
2644	IF ( nest_offl%lod_west_w /= 1 .AND. nest_offl%lod_west_w /= 2 ) nest_offl%lod_west_w = 2
2645
2646	IF ( nest_offl%lod_top_pt /= 1 .AND. nest_offl%lod_top_pt /= 2 ) nest_offl%lod_top_pt = 2
2647	IF ( nest_offl%lod_top_qv /= 1 .AND. nest_offl%lod_top_qv /= 2 ) nest_offl%lod_top_qv = 2
2648	IF ( nest_offl%lod_top_u /= 1 .AND. nest_offl%lod_top_u /= 2 ) nest_offl%lod_top_u = 2
2649	IF ( nest_offl%lod_top_v /= 1 .AND. nest_offl%lod_top_v /= 2 ) nest_offl%lod_top_v = 2
2650	IF ( nest_offl%lod_top_w /= 1 .AND. nest_offl%lod_top_w /= 2 ) nest_offl%lod_top_w = 2
2651	!
2652	!-- For consistency, check if all boundary input variables have the same LOD.
2653	IF ( MAX( nest_offl%lod_east_pt, nest_offl%lod_east_qv, nest_offl%lod_east_u, &
2654	nest_offl%lod_east_v, nest_offl%lod_east_w, &
2655	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2656	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2657	nest_offl%lod_south_pt, nest_offl%lod_south_qv, nest_offl%lod_south_u, &
2658	nest_offl%lod_south_v, nest_offl%lod_south_w, &
2659	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2660	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2661	nest_offl%lod_top_pt, nest_offl%lod_top_qv, nest_offl%lod_top_u, &
2662	nest_offl%lod_top_v, nest_offl%lod_top_w ) &
2663	/= &
2664	MIN( nest_offl%lod_east_pt, nest_offl%lod_east_qv, nest_offl%lod_east_u, &
2665	nest_offl%lod_east_v, nest_offl%lod_east_w, &
2666	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2667	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2668	nest_offl%lod_south_pt, nest_offl%lod_south_qv, nest_offl%lod_south_u, &
2669	nest_offl%lod_south_v, nest_offl%lod_south_w, &
2670	nest_offl%lod_north_pt, nest_offl%lod_north_qv, nest_offl%lod_north_u, &
2671	nest_offl%lod_north_v, nest_offl%lod_north_w, &
2672	nest_offl%lod_top_pt, nest_offl%lod_top_qv, nest_offl%lod_top_u, &
2673	nest_offl%lod_top_v, nest_offl%lod_top_w ) ) THEN
2674	message_string = 'A mixture of different LOD for the provided boundary data is not ' // &
2675	'possible.'
2676	CALL message( 'nesting_offl_init', 'PA0504', 1, 2, 0, 6, 0 )
2677	ENDIF
2678	!
2679	!-- As all LODs are the same, store it.
2680	lod = nest_offl%lod_east_u
2681	!
2682	!-- Allocate arrays for geostrophic wind components. Arrays will
2683	!-- incorporate 2 time levels in order to interpolate in between.
2684	ALLOCATE( nest_offl%ug(0:1,1:nzt) )
2685	ALLOCATE( nest_offl%vg(0:1,1:nzt) )
2686	!
2687	!-- Set index range according to the given LOD in order to allocate the input arrays
2688	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2689	IF ( lod == 2 ) THEN
2690	j_start = nys
2691	j_start_v = nysv
2692	j_end = nyn
2693	ELSE
2694	j_start = 1
2695	j_start_v = 1
2696	j_end = 1
2697	ENDIF
2698	ENDIF
2699
2700	IF ( bc_dirichlet_n .OR. bc_dirichlet_s ) THEN
2701	IF( lod == 2 ) THEN
2702	i_start = nxl
2703	i_start_u = nxlu
2704	i_end = nxr
2705	ELSE
2706	i_start = 1
2707	i_start_u = 1
2708	i_end = 1
2709	ENDIF
2710	ENDIF
2711	!
2712	!-- Allocate arrays for reading left/right boundary values. Arrays will
2713	!-- incorporate 2 time levels in order to interpolate in between. Depending on the given LOD,
2714	!-- the x-, or y-dimension will be either nxl:nxr, or nys:nyn (for LOD=2), or it reduces to
2715	!-- one element for LOD=1. If the core has no lateral boundary, allocate a dummy array as well,
2716	!-- in order to enable netcdf parallel access. Dummy arrays will be allocated with dimension
2717	!-- length zero.
2718	IF ( bc_dirichlet_l ) THEN
2719	ALLOCATE( nest_offl%u_l(0:1,nzb+1:nzt,j_start:j_end) )
2720	ALLOCATE( nest_offl%v_l(0:1,nzb+1:nzt,j_start_v:j_end) )
2721	ALLOCATE( nest_offl%w_l(0:1,nzb+1:nzt-1,j_start:j_end) )
2722	IF ( humidity ) ALLOCATE( nest_offl%q_l(0:1,nzb+1:nzt,j_start:j_end) )
2723	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_l(0:1,nzb+1:nzt,j_start:j_end) )
2724	IF ( air_chemistry .AND. nesting_offline_chem ) &
2725	ALLOCATE( nest_offl%chem_l(0:1,nzb+1:nzt,j_start:j_end,1:UBOUND( chem_species, 1 )) )
2726	ELSE
2727	ALLOCATE( nest_offl%u_l(1:1,1:1,1:1) )
2728	ALLOCATE( nest_offl%v_l(1:1,1:1,1:1) )
2729	ALLOCATE( nest_offl%w_l(1:1,1:1,1:1) )
2730	IF ( humidity ) ALLOCATE( nest_offl%q_l(1:1,1:1,1:1) )
2731	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_l(1:1,1:1,1:1) )
2732	IF ( air_chemistry .AND. nesting_offline_chem ) &
2733	ALLOCATE( nest_offl%chem_l(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2734	ENDIF
2735	IF ( bc_dirichlet_r ) THEN
2736	ALLOCATE( nest_offl%u_r(0:1,nzb+1:nzt,j_start:j_end) )
2737	ALLOCATE( nest_offl%v_r(0:1,nzb+1:nzt,j_start_v:j_end) )
2738	ALLOCATE( nest_offl%w_r(0:1,nzb+1:nzt-1,j_start:j_end) )
2739	IF ( humidity ) ALLOCATE( nest_offl%q_r(0:1,nzb+1:nzt,j_start:j_end) )
2740	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_r(0:1,nzb+1:nzt,j_start:j_end) )
2741	IF ( air_chemistry .AND. nesting_offline_chem ) &
2742	ALLOCATE( nest_offl%chem_r(0:1,nzb+1:nzt,j_start:j_end,1:UBOUND( chem_species, 1 )) )
2743	ELSE
2744	ALLOCATE( nest_offl%u_r(1:1,1:1,1:1) )
2745	ALLOCATE( nest_offl%v_r(1:1,1:1,1:1) )
2746	ALLOCATE( nest_offl%w_r(1:1,1:1,1:1) )
2747	IF ( humidity ) ALLOCATE( nest_offl%q_r(1:1,1:1,1:1) )
2748	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_r(1:1,1:1,1:1) )
2749	IF ( air_chemistry .AND. nesting_offline_chem ) &
2750	ALLOCATE( nest_offl%chem_r(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2751	ENDIF
2752	!
2753	!-- Allocate arrays for reading north/south boundary values. Arrays will
2754	!-- incorporate 2 time levels in order to interpolate in between. If the core has
2755	!-- no boundary, allocate a dummy array, in order to enable netcdf parallel
2756	!-- access. Dummy arrays will be allocated with dimension length zero.
2757	IF ( bc_dirichlet_n ) THEN
2758	ALLOCATE( nest_offl%u_n(0:1,nzb+1:nzt,i_start_u:i_end) )
2759	ALLOCATE( nest_offl%v_n(0:1,nzb+1:nzt,i_start:i_end) )
2760	ALLOCATE( nest_offl%w_n(0:1,nzb+1:nzt-1,i_start:i_end) )
2761	IF ( humidity ) ALLOCATE( nest_offl%q_n(0:1,nzb+1:nzt,i_start:i_end) )
2762	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_n(0:1,nzb+1:nzt,i_start:i_end) )
2763	IF ( air_chemistry .AND. nesting_offline_chem ) &
2764	ALLOCATE( nest_offl%chem_n(0:1,nzb+1:nzt,i_start:i_end,1:UBOUND( chem_species, 1 )) )
2765	ELSE
2766	ALLOCATE( nest_offl%u_n(1:1,1:1,1:1) )
2767	ALLOCATE( nest_offl%v_n(1:1,1:1,1:1) )
2768	ALLOCATE( nest_offl%w_n(1:1,1:1,1:1) )
2769	IF ( humidity ) ALLOCATE( nest_offl%q_n(1:1,1:1,1:1) )
2770	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_n(1:1,1:1,1:1) )
2771	IF ( air_chemistry .AND. nesting_offline_chem ) &
2772	ALLOCATE( nest_offl%chem_n(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2773	ENDIF
2774	IF ( bc_dirichlet_s ) THEN
2775	ALLOCATE( nest_offl%u_s(0:1,nzb+1:nzt,i_start_u:i_end) )
2776	ALLOCATE( nest_offl%v_s(0:1,nzb+1:nzt,i_start:i_end) )
2777	ALLOCATE( nest_offl%w_s(0:1,nzb+1:nzt-1,i_start:i_end) )
2778	IF ( humidity ) ALLOCATE( nest_offl%q_s(0:1,nzb+1:nzt,i_start:i_end) )
2779	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_s(0:1,nzb+1:nzt,i_start:i_end) )
2780	IF ( air_chemistry .AND. nesting_offline_chem ) &
2781	ALLOCATE( nest_offl%chem_s(0:1,nzb+1:nzt,i_start:i_end,1:UBOUND( chem_species, 1 )) )
2782	ELSE
2783	ALLOCATE( nest_offl%u_s(1:1,1:1,1:1) )
2784	ALLOCATE( nest_offl%v_s(1:1,1:1,1:1) )
2785	ALLOCATE( nest_offl%w_s(1:1,1:1,1:1) )
2786	IF ( humidity ) ALLOCATE( nest_offl%q_s(1:1,1:1,1:1) )
2787	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_s(1:1,1:1,1:1) )
2788	IF ( air_chemistry .AND. nesting_offline_chem ) &
2789	ALLOCATE( nest_offl%chem_s(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2790	ENDIF
2791	!
2792	!-- Allocate arrays for reading data at the top boundary. In contrast to the
2793	!-- lateral boundaries, every core reads these data so that no dummy
2794	!-- arrays need to be allocated.
2795	IF ( lod == 2 ) THEN
2796	ALLOCATE( nest_offl%u_top(0:1,nys:nyn,nxlu:nxr) )
2797	ALLOCATE( nest_offl%v_top(0:1,nysv:nyn,nxl:nxr) )
2798	ALLOCATE( nest_offl%w_top(0:1,nys:nyn,nxl:nxr) )
2799	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,nys:nyn,nxl:nxr) )
2800	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,nys:nyn,nxl:nxr) )
2801	IF ( air_chemistry .AND. nesting_offline_chem ) &
2802	ALLOCATE( nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,1:UBOUND( chem_species, 1 )) )
2803	ELSE
2804	ALLOCATE( nest_offl%u_top(0:1,1:1,1:1) )
2805	ALLOCATE( nest_offl%v_top(0:1,1:1,1:1) )
2806	ALLOCATE( nest_offl%w_top(0:1,1:1,1:1) )
2807	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,1:1,1:1) )
2808	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,1:1,1:1) )
2809	IF ( air_chemistry .AND. nesting_offline_chem ) &
2810	ALLOCATE( nest_offl%chem_top(0:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
2811	ENDIF
2812	!
2813	!-- For chemical species, create the names of the variables. This is necessary
2814	!-- to identify the respective variable and write it onto the correct array
2815	!-- in the chem_species datatype.
2816	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2817	ALLOCATE( nest_offl%chem_from_file_l(1:UBOUND( chem_species, 1 )) )
2818	ALLOCATE( nest_offl%chem_from_file_n(1:UBOUND( chem_species, 1 )) )
2819	ALLOCATE( nest_offl%chem_from_file_r(1:UBOUND( chem_species, 1 )) )
2820	ALLOCATE( nest_offl%chem_from_file_s(1:UBOUND( chem_species, 1 )) )
2821	ALLOCATE( nest_offl%chem_from_file_t(1:UBOUND( chem_species, 1 )) )
2822
2823	ALLOCATE( nest_offl%var_names_chem_l(1:UBOUND( chem_species, 1 )) )
2824	ALLOCATE( nest_offl%var_names_chem_n(1:UBOUND( chem_species, 1 )) )
2825	ALLOCATE( nest_offl%var_names_chem_r(1:UBOUND( chem_species, 1 )) )
2826	ALLOCATE( nest_offl%var_names_chem_s(1:UBOUND( chem_species, 1 )) )
2827	ALLOCATE( nest_offl%var_names_chem_t(1:UBOUND( chem_species, 1 )) )
2828	!
2829	!-- Initialize flags that indicate whether the variable is on file or
2830	!-- not. Please note, this is only necessary for chemistry variables.
2831	nest_offl%chem_from_file_l(:) = .FALSE.
2832	nest_offl%chem_from_file_n(:) = .FALSE.
2833	nest_offl%chem_from_file_r(:) = .FALSE.
2834	nest_offl%chem_from_file_s(:) = .FALSE.
2835	nest_offl%chem_from_file_t(:) = .FALSE.
2836
2837	DO n = 1, UBOUND( chem_species, 1 )
2838	nest_offl%var_names_chem_l(n) = nest_offl%char_l // &
2839	TRIM(chem_species(n)%name)
2840	nest_offl%var_names_chem_n(n) = nest_offl%char_n // &
2841	TRIM(chem_species(n)%name)
2842	nest_offl%var_names_chem_r(n) = nest_offl%char_r // &
2843	TRIM(chem_species(n)%name)
2844	nest_offl%var_names_chem_s(n) = nest_offl%char_s // &
2845	TRIM(chem_species(n)%name)
2846	nest_offl%var_names_chem_t(n) = nest_offl%char_t // &
2847	TRIM(chem_species(n)%name)
2848	ENDDO
2849	ENDIF
2850	!
2851	!-- Offline nesting for salsa
2852	IF ( salsa ) CALL salsa_nesting_offl_init
2853	!
2854	!-- Before initial data input is initiated, check if dynamic input file is
2855	!-- present.
2856	IF ( .NOT. input_pids_dynamic ) THEN
2857	message_string = 'nesting_offline = .TRUE. requires dynamic ' // &
2858	'input file ' // &
2859	TRIM( input_file_dynamic ) // TRIM( coupling_char )
2860	CALL message( 'nesting_offl_init', 'PA0546', 1, 2, 0, 6, 0 )
2861	ENDIF
2862	!
2863	!-- Read COSMO data at lateral and top boundaries
2864	CALL nesting_offl_input
2865	!
2866	!-- Check if sufficient time steps are provided to cover the entire
2867	!-- simulation. Note, dynamic input is only required for the 3D simulation,
2868	!-- not for the soil/wall spinup. However, as the spinup time is added
2869	!-- to the end_time, this must be considered here.
2870	IF ( end_time - spinup_time > nest_offl%time(nest_offl%nt-1) ) THEN
2871	message_string = 'end_time of the simulation exceeds the ' // &
2872	'time dimension in the dynamic input file.'
2873	CALL message( 'nesting_offl_init', 'PA0183', 1, 2, 0, 6, 0 )
2874	ENDIF
2875	!
2876	!-- Set indicies for boundary grid points
2877	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
2878	i_bound = MERGE( nxl - 1, nxr + 1, bc_dirichlet_l )
2879	i_bound_u = MERGE( nxlu - 1, nxr + 1, bc_dirichlet_l )
2880	ENDIF
2881	IF ( bc_dirichlet_n .OR. bc_dirichlet_s ) THEN
2882	j_bound = MERGE( nys - 1, nyn + 1, bc_dirichlet_s )
2883	j_bound_v = MERGE( nysv - 1, nyn + 1, bc_dirichlet_s )
2884	ENDIF
2885	!
2886	!-- Initialize boundary data. Please note, do not initialize boundaries in
2887	!-- case of restart runs. This case the boundaries are already initialized
2888	!-- and the boundary data from file would be on the wrong time level.
2889	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
2890	!
2891	!-- Distinguish between LOD = 1 and LOD = 2 inititialization
2892	IF ( lod == 2 ) THEN
2893	IF ( bc_dirichlet_l ) THEN
2894	u(nzb+1:nzt,nys:nyn,i_bound_u) = nest_offl%u_l(0,nzb+1:nzt,nys:nyn)
2895	v(nzb+1:nzt,nysv:nyn,i_bound) = nest_offl%v_l(0,nzb+1:nzt,nysv:nyn)
2896	w(nzb+1:nzt-1,nys:nyn,i_bound) = nest_offl%w_l(0,nzb+1:nzt-1,nys:nyn)
2897	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%pt_l(0,nzb+1:nzt,nys:nyn)
2898	IF ( humidity ) q(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%q_l(0,nzb+1:nzt,nys:nyn)
2899	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2900	DO n = 1, UBOUND( chem_species, 1 )
2901	IF( nest_offl%chem_from_file_l(n) ) THEN
2902	chem_species(n)%conc(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%chem_l(0,nzb+1:nzt,nys:nyn,n)
2903	ENDIF
2904	ENDDO
2905	ENDIF
2906	ENDIF
2907	IF ( bc_dirichlet_r ) THEN
2908	u(nzb+1:nzt,nys:nyn,i_bound_u) = nest_offl%u_r(0,nzb+1:nzt,nys:nyn)
2909	v(nzb+1:nzt,nysv:nyn,i_bound) = nest_offl%v_r(0,nzb+1:nzt,nysv:nyn)
2910	w(nzb+1:nzt-1,nys:nyn,i_bound) = nest_offl%w_r(0,nzb+1:nzt-1,nys:nyn)
2911	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%pt_r(0,nzb+1:nzt,nys:nyn)
2912	IF ( humidity ) q(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%q_r(0,nzb+1:nzt,nys:nyn)
2913	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2914	DO n = 1, UBOUND( chem_species, 1 )
2915	IF( nest_offl%chem_from_file_r(n) ) THEN
2916	chem_species(n)%conc(nzb+1:nzt,nys:nyn,i_bound) = nest_offl%chem_r(0,nzb+1:nzt,nys:nyn,n)
2917	ENDIF
2918	ENDDO
2919	ENDIF
2920	ENDIF
2921
2922	IF ( bc_dirichlet_n) THEN
2923	u(nzb+1:nzt,j_bound,nxlu:nxr) = nest_offl%u_n(0,nzb+1:nzt,nxlu:nxr)
2924	v(nzb+1:nzt,j_bound_v,nxl:nxr) = nest_offl%v_n(0,nzb+1:nzt,nxl:nxr)
2925	w(nzb+1:nzt-1,j_bound,nxl:nxr) = nest_offl%w_n(0,nzb+1:nzt-1,nxl:nxr)
2926	IF ( .NOT. neutral ) pt(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%pt_n(0,nzb+1:nzt,nxl:nxr)
2927	IF ( humidity ) q(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%q_n(0,nzb+1:nzt,nxl:nxr)
2928	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2929	DO n = 1, UBOUND( chem_species, 1 )
2930	IF( nest_offl%chem_from_file_n(n) ) THEN
2931	chem_species(n)%conc(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%chem_n(0,nzb+1:nzt,nxl:nxr,n)
2932	ENDIF
2933	ENDDO
2934	ENDIF
2935	ENDIF
2936	IF ( bc_dirichlet_s) THEN
2937	u(nzb+1:nzt,j_bound,nxlu:nxr) = nest_offl%u_s(0,nzb+1:nzt,nxlu:nxr)
2938	v(nzb+1:nzt,j_bound_v,nxl:nxr) = nest_offl%v_s(0,nzb+1:nzt,nxl:nxr)
2939	w(nzb+1:nzt-1,j_bound,nxl:nxr) = nest_offl%w_s(0,nzb+1:nzt-1,nxl:nxr)
2940	IF ( .NOT. neutral ) pt(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%pt_s(0,nzb+1:nzt,nxl:nxr)
2941	IF ( humidity ) q(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%q_s(0,nzb+1:nzt,nxl:nxr)
2942	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2943	DO n = 1, UBOUND( chem_species, 1 )
2944	IF( nest_offl%chem_from_file_s(n) ) THEN
2945	chem_species(n)%conc(nzb+1:nzt,j_bound,nxl:nxr) = nest_offl%chem_s(0,nzb+1:nzt,nxl:nxr,n)
2946	ENDIF
2947	ENDDO
2948	ENDIF
2949	ENDIF
2950
2951	u(nzt+1,nys:nyn,nxlu:nxr) = nest_offl%u_top(0,nys:nyn,nxlu:nxr)
2952	v(nzt+1,nysv:nyn,nxl:nxr) = nest_offl%v_top(0,nysv:nyn,nxl:nxr)
2953	w(nzt,nys:nyn,nxl:nxr) = nest_offl%w_top(0,nys:nyn,nxl:nxr)
2954	w(nzt+1,nys:nyn,nxl:nxr) = nest_offl%w_top(0,nys:nyn,nxl:nxr)
2955	IF ( .NOT. neutral ) pt(nzt+1,nys:nyn,nxl:nxr) = nest_offl%pt_top(0,nys:nyn,nxl:nxr)
2956	IF ( humidity ) q(nzt+1,nys:nyn,nxl:nxr) = nest_offl%q_top(0,nys:nyn,nxl:nxr)
2957	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2958	DO n = 1, UBOUND( chem_species, 1 )
2959	IF( nest_offl%chem_from_file_t(n) ) THEN
2960	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = nest_offl%chem_top(0,nys:nyn,nxl:nxr,n)
2961	ENDIF
2962	ENDDO
2963	ENDIF
2964	!
2965	!-- LOD 1
2966	ELSE
2967	IF ( bc_dirichlet_l ) THEN
2968	DO j = nys, nyn
2969	u(nzb+1:nzt,j,i_bound_u) = nest_offl%u_l(0,nzb+1:nzt,1)
2970	w(nzb+1:nzt-1,j,i_bound) = nest_offl%w_l(0,nzb+1:nzt-1,1)
2971	ENDDO
2972	DO j = nysv, nyn
2973	v(nzb+1:nzt,j,i_bound) = nest_offl%v_l(0,nzb+1:nzt,1)
2974	ENDDO
2975	IF ( .NOT. neutral ) THEN
2976	DO j = nys, nyn
2977	pt(nzb+1:nzt,j,i_bound) = nest_offl%pt_l(0,nzb+1:nzt,1)
2978	ENDDO
2979	ENDIF
2980	IF ( humidity ) THEN
2981	DO j = nys, nyn
2982	q(nzb+1:nzt,j,i_bound) = nest_offl%q_l(0,nzb+1:nzt,1)
2983	ENDDO
2984	ENDIF
2985	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
2986	DO n = 1, UBOUND( chem_species, 1 )
2987	IF( nest_offl%chem_from_file_l(n) ) THEN
2988	DO j = nys, nyn
2989	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = nest_offl%chem_l(0,nzb+1:nzt,1,n)
2990	ENDDO
2991	ENDIF
2992	ENDDO
2993	ENDIF
2994	ENDIF
2995	IF ( bc_dirichlet_r ) THEN
2996	DO j = nys, nyn
2997	u(nzb+1:nzt,j,i_bound_u) = nest_offl%u_r(0,nzb+1:nzt,1)
2998	w(nzb+1:nzt-1,j,i_bound) = nest_offl%w_r(0,nzb+1:nzt-1,1)
2999	ENDDO
3000	DO j = nysv, nyn
3001	v(nzb+1:nzt,j,i_bound) = nest_offl%v_r(0,nzb+1:nzt,1)
3002	ENDDO
3003	IF ( .NOT. neutral ) THEN
3004	DO j = nys, nyn
3005	pt(nzb+1:nzt,j,i_bound) = nest_offl%pt_r(0,nzb+1:nzt,1)
3006	ENDDO
3007	ENDIF
3008	IF ( humidity ) THEN
3009	DO j = nys, nyn
3010	q(nzb+1:nzt,j,i_bound) = nest_offl%q_r(0,nzb+1:nzt,1)
3011	ENDDO
3012	ENDIF
3013	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3014	DO n = 1, UBOUND( chem_species, 1 )
3015	IF( nest_offl%chem_from_file_r(n) ) THEN
3016	DO j = nys, nyn
3017	chem_species(n)%conc(nzb+1:nzt,j,i_bound) = nest_offl%chem_r(0,nzb+1:nzt,1,n)
3018	ENDDO
3019	ENDIF
3020	ENDDO
3021	ENDIF
3022	ENDIF
3023	IF ( bc_dirichlet_n ) THEN
3024	DO i = nxlu, nxr
3025	u(nzb+1:nzt,j_bound,i) = nest_offl%u_n(0,nzb+1:nzt,1)
3026	ENDDO
3027	DO i = nxl, nxr
3028	v(nzb+1:nzt,j_bound_v,i) = nest_offl%v_n(0,nzb+1:nzt,1)
3029	w(nzb+1:nzt-1,j_bound,i) = nest_offl%w_n(0,nzb+1:nzt-1,1)
3030	ENDDO
3031	IF ( .NOT. neutral ) THEN
3032	DO i = nxl, nxr
3033	pt(nzb+1:nzt,j_bound,i) = nest_offl%pt_n(0,nzb+1:nzt,1)
3034	ENDDO
3035	ENDIF
3036	IF ( humidity ) THEN
3037	DO i = nxl, nxr
3038	q(nzb+1:nzt,j_bound,i) = nest_offl%q_n(0,nzb+1:nzt,1)
3039	ENDDO
3040	ENDIF
3041	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3042	DO n = 1, UBOUND( chem_species, 1 )
3043	IF( nest_offl%chem_from_file_n(n) ) THEN
3044	DO i = nxl, nxr
3045	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = nest_offl%chem_n(0,nzb+1:nzt,1,n)
3046	ENDDO
3047	ENDIF
3048	ENDDO
3049	ENDIF
3050	ENDIF
3051	IF ( bc_dirichlet_s ) THEN
3052	DO i = nxlu, nxr
3053	u(nzb+1:nzt,j_bound,i) = nest_offl%u_s(0,nzb+1:nzt,1)
3054	ENDDO
3055	DO i = nxl, nxr
3056	v(nzb+1:nzt,j_bound_v,i) = nest_offl%v_s(0,nzb+1:nzt,1)
3057	w(nzb+1:nzt-1,j_bound,i) = nest_offl%w_s(0,nzb+1:nzt-1,1)
3058	ENDDO
3059	IF ( .NOT. neutral ) THEN
3060	DO i = nxl, nxr
3061	pt(nzb+1:nzt,j_bound,i) = nest_offl%pt_s(0,nzb+1:nzt,1)
3062	ENDDO
3063	ENDIF
3064	IF ( humidity ) THEN
3065	DO i = nxl, nxr
3066	q(nzb+1:nzt,j_bound,i) = nest_offl%q_s(0,nzb+1:nzt,1)
3067	ENDDO
3068	ENDIF
3069	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3070	DO n = 1, UBOUND( chem_species, 1 )
3071	IF( nest_offl%chem_from_file_s(n) ) THEN
3072	DO i = nxl, nxr
3073	chem_species(n)%conc(nzb+1:nzt,j_bound,i) = nest_offl%chem_s(0,nzb+1:nzt,1,n)
3074	ENDDO
3075	ENDIF
3076	ENDDO
3077	ENDIF
3078	ENDIF
3079
3080	u(nzt+1,nys:nyn,nxlu:nxr) = nest_offl%u_top(0,1,1)
3081	v(nzt+1,nysv:nyn,nxl:nxr) = nest_offl%v_top(0,1,1)
3082	w(nzt,nys:nyn,nxl:nxr) = nest_offl%w_top(0,1,1)
3083	w(nzt+1,nys:nyn,nxl:nxr) = nest_offl%w_top(0,1,1)
3084	IF ( .NOT. neutral ) pt(nzt+1,nys:nyn,nxl:nxr) = nest_offl%pt_top(0,1,1)
3085	IF ( humidity ) q(nzt+1,nys:nyn,nxl:nxr) = nest_offl%q_top(0,1,1)
3086	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
3087	DO n = 1, UBOUND( chem_species, 1 )
3088	IF( nest_offl%chem_from_file_t(n) ) THEN
3089	chem_species(n)%conc(nzt+1,nys:nyn,nxl:nxr) = nest_offl%chem_top(0,1,1,n)
3090	ENDIF
3091	ENDDO
3092	ENDIF
3093	ENDIF
3094	!
3095	!-- In case of offline nesting the pressure forms itself based on the prescribed lateral
3096	!-- boundary conditions. Hence, explicit forcing by pressure gradients via geostrophic
3097	!-- wind components is not necessary and would be canceled out by the perturbation
3098	!-- pressure otherwise. For this reason, set geostrophic wind components to zero.
3099	ug(nzb+1:nzt) = 0.0_wp
3100	vg(nzb+1:nzt) = 0.0_wp
3101
3102	ENDIF
3103	!
3104	!-- After boundary data is initialized, mask topography at the
3105	!-- boundaries for the velocity components.
3106	u = MERGE( u, 0.0_wp, BTEST( wall_flags_total_0, 1 ) )
3107	v = MERGE( v, 0.0_wp, BTEST( wall_flags_total_0, 2 ) )
3108	w = MERGE( w, 0.0_wp, BTEST( wall_flags_total_0, 3 ) )
3109	!
3110	!-- Initial calculation of the boundary layer depth from the prescribed
3111	!-- boundary data. This is requiered for initialize the synthetic turbulence
3112	!-- generator correctly.
3113	CALL nesting_offl_calc_zi
3114	!
3115	!-- After boundary data is initialized, ensure mass conservation. Not
3116	!-- necessary in restart runs.
3117	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
3118	CALL nesting_offl_mass_conservation
3119	ENDIF
3120
3121	END SUBROUTINE nesting_offl_init
3122
3123	!------------------------------------------------------------------------------!
3124	! Description:
3125	!------------------------------------------------------------------------------!
3126	!> Interpolation function, used to interpolate boundary data in time.
3127	!------------------------------------------------------------------------------!
3128	FUNCTION interpolate_in_time( var_t1, var_t2, fac )
3129
3130	REAL(wp) :: interpolate_in_time !< time-interpolated boundary value
3131	REAL(wp) :: var_t1 !< boundary value at t1
3132	REAL(wp) :: var_t2 !< boundary value at t2
3133	REAL(wp) :: fac !< interpolation factor
3134
3135	interpolate_in_time = ( 1.0_wp - fac ) * var_t1 + fac * var_t2
3136
3137	END FUNCTION interpolate_in_time
3138
3139
3140
3141	END MODULE nesting_offl_mod

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