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source: palm/trunk/SOURCE/nesting_offl_mod.f90 @ 4648

Last change on this file since 4648 was 4582, checked in by suehring, 4 years ago
remove unused variable from last commit
Property svn:keywords set to `Id`
File size: 111.4 KB

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[3347]	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	!
[4360]	17	! Copyright 1997-2020 Leibniz Universitaet Hannover
[3347]	18	!------------------------------------------------------------------------------!
	19	!
	20	! Current revisions:
	21	! ------------------
	22	!
[4564]	23	!
[3347]	24	! Former revisions:
	25	! -----------------
[3413]	26	! $Id: nesting_offl_mod.f90 4582 2020-06-29 09:22:11Z raasch $
[4582]	27	! Remove unused variable
	28	!
	29	! 4581 2020-06-29 08:49:58Z suehring
[4581]	30	! Omit explicit pressure forcing via geostrophic wind components in case of
	31	! mesoscale nesting.
	32	!
	33	! 4561 2020-06-12 07:05:56Z suehring
[4564]	34	! Adapt mass-flux correction also for the anelastic approximation
	35	!
	36	! 4561 2020-06-12 07:05:56Z suehring
[4457]	37	! use statement for exchange horiz added
	38	!
	39	! 4360 2020-01-07 11:25:50Z suehring
[4358]	40	! Bugfix, time coordinate is relative to origin_time rather than to 00:00:00
	41	! UTC.
	42	!
	43	! 4346 2019-12-18 11:55:56Z motisi
[4346]	44	! Introduction of wall_flags_total_0, which currently sets bits based on static
	45	! topography information used in wall_flags_static_0
	46	!
	47	! 4329 2019-12-10 15:46:36Z motisi
[4329]	48	! Renamed wall_flags_0 to wall_flags_static_0
	49	!
	50	! 4286 2019-10-30 16:01:14Z resler
[4286]	51	! Fix wrong checks of time from dynamic driver in nesting_offl_mod
	52	!
	53	! 4273 2019-10-24 13:40:54Z monakurppa
[4273]	54	! Add a logical switch nesting_offline_chem
	55	!
	56	! 4270 2019-10-23 10:46:20Z monakurppa
[4270]	57	! Implement offline nesting for salsa variables.
	58	!
	59	! 4231 2019-09-12 11:22:00Z suehring
[4231]	60	! Bugfix in array deallocation
	61	!
	62	! 4230 2019-09-11 13:58:14Z suehring
[4230]	63	! Update mean chemistry profiles. These are also used for rayleigh damping.
	64	!
	65	! 4227 2019-09-10 18:04:34Z gronemeier
	66	! implement new palm_date_time_mod
	67	!
[4226]	68	! - Data input moved into nesting_offl_mod
	69	! - check rephrased
	70	! - time variable is now relative to time_utc_init
	71	! - Define module specific data type for offline nesting in nesting_offl_mod
	72	!
	73	! 4182 2019-08-22 15:20:23Z scharf
[4182]	74	! Corrected "Former revisions" section
	75	!
	76	! 4169 2019-08-19 13:54:35Z suehring
[4169]	77	! Additional check added.
	78	!
	79	! 4168 2019-08-16 13:50:17Z suehring
[4168]	80	! Replace function get_topography_top_index by topo_top_ind
	81	!
	82	! 4125 2019-07-29 13:31:44Z suehring
[4125]	83	! In order to enable netcdf parallel access, allocate dummy arrays for the
	84	! lateral boundary data on cores that actually do not belong to these
	85	! boundaries.
	86	!
	87	! 4079 2019-07-09 18:04:41Z suehring
[4079]	88	! - Set boundary condition for w at nzt+1 at the lateral boundaries, even
	89	! though these won't enter the numerical solution. However, due to the mass
	90	! conservation these values might some up to very large values which will
	91	! occur in the run-control file
	92	! - Bugfix in offline nesting of chemical species
	93	! - Do not set Neumann conditions for TKE and passive scalar
	94	!
	95	! 4022 2019-06-12 11:52:39Z suehring
[4022]	96	! Detection of boundary-layer depth in stable boundary layer on basis of
	97	! boundary data improved
	98	! Routine for boundary-layer depth calculation renamed and made public
	99	!
	100	! 3987 2019-05-22 09:52:13Z kanani
[3987]	101	! Introduce alternative switch for debug output during timestepping
	102	!
	103	! 3964 2019-05-09 09:48:32Z suehring
[3964]	104	! Ensure that veloctiy term in calculation of bulk Richardson number does not
	105	! become zero
	106	!
	107	! 3937 2019-04-29 15:09:07Z suehring
[3937]	108	! Set boundary conditon on upper-left and upper-south grid point for the u- and
	109	! v-component, respectively.
	110	!
	111	! 3891 2019-04-12 17:52:01Z suehring
[3891]	112	! Bugfix, do not overwrite lateral and top boundary data in case of restart
	113	! runs.
	114	!
	115	! 3885 2019-04-11 11:29:34Z kanani
[3885]	116	! Changes related to global restructuring of location messages and introduction
	117	! of additional debug messages
	118	!
	119	!
[3858]	120	! Do local data exchange for chemistry variables only when boundary data is
	121	! coming from dynamic file
	122	!
	123	! 3737 2019-02-12 16:57:06Z suehring
[3737]	124	! Introduce mesoscale nesting for chemical species
	125	!
	126	! 3705 2019-01-29 19:56:39Z suehring
[3705]	127	! Formatting adjustments
	128	!
	129	! 3704 2019-01-29 19:51:41Z suehring
[3579]	130	! Check implemented for offline nesting in child domain
	131	!
[4182]	132	! Initial Revision:
	133	! - separate offline nesting from large_scale_nudging_mod
	134	! - revise offline nesting, adjust for usage of synthetic turbulence generator
	135	! - adjust Rayleigh damping depending on the time-depending atmospheric
	136	! conditions
[3413]	137	!
[4182]	138	!
[3347]	139	! Description:
	140	! ------------
	141	!> Offline nesting in larger-scale models. Boundary conditions for the simulation
	142	!> are read from NetCDF file and are prescribed onto the respective arrays.
	143	!> Further, a mass-flux correction is performed to maintain the mass balance.
	144	!--------------------------------------------------------------------------------!
	145	MODULE nesting_offl_mod
	146
	147	USE arrays_3d, &
[4226]	148	ONLY: dzw, &
	149	e, &
[4561]	150	drho_air_zw, &
[4226]	151	diss, &
	152	pt, &
	153	pt_init, &
	154	q, &
	155	q_init, &
	156	rdf, &
	157	rdf_sc, &
[4561]	158	rho_air, &
	159	rho_air_zw, &
[4226]	160	s, &
	161	u, &
	162	u_init, &
	163	ug, &
	164	v, &
	165	v_init, &
	166	vg, &
	167	w, &
	168	zu, &
	169	zw
	170
	171	USE basic_constants_and_equations_mod, &
	172	ONLY: g, &
	173	pi
[4273]	174
[3876]	175	USE chem_modules, &
[4273]	176	ONLY: chem_species, nesting_offline_chem
[3347]	177
	178	USE control_parameters, &
[4169]	179	ONLY: air_chemistry, &
	180	bc_dirichlet_l, &
	181	bc_dirichlet_n, &
	182	bc_dirichlet_r, &
	183	bc_dirichlet_s, &
[4226]	184	coupling_char, &
[4169]	185	dt_3d, &
	186	dz, &
	187	constant_diffusion, &
	188	child_domain, &
[3987]	189	debug_output_timestep, &
[4169]	190	end_time, &
[3987]	191	humidity, &
	192	initializing_actions, &
[4169]	193	message_string, &
	194	nesting_offline, &
	195	neutral, &
	196	passive_scalar, &
	197	rans_mode, &
	198	rans_tke_e, &
	199	rayleigh_damping_factor, &
	200	rayleigh_damping_height, &
[4270]	201	salsa, &
[4169]	202	spinup_time, &
	203	time_since_reference_point, &
	204	volume_flow
[4273]	205
[3347]	206	USE cpulog, &
[4226]	207	ONLY: cpu_log, &
	208	log_point, &
	209	log_point_s
[3347]	210
	211	USE grid_variables
	212
	213	USE indices, &
	214	ONLY: nbgp, nx, nxl, nxlg, nxlu, nxr, nxrg, ny, nys, &
[4168]	215	nysv, nysg, nyn, nyng, nzb, nz, nzt, &
	216	topo_top_ind, &
[4346]	217	wall_flags_total_0
[3347]	218
	219	USE kinds
	220
	221	USE netcdf_data_input_mod, &
[4226]	222	ONLY: check_existence, &
	223	close_input_file, &
	224	get_dimension_length, &
	225	get_variable, &
	226	get_variable_pr, &
	227	input_pids_dynamic, &
	228	inquire_num_variables, &
	229	inquire_variable_names, &
	230	input_file_dynamic, &
	231	num_var_pids, &
	232	open_read_file, &
	233	pids_id
	234
[3347]	235	USE pegrid
	236
[4270]	237	USE salsa_mod, &
	238	ONLY: salsa_nesting_offl_bc, &
	239	salsa_nesting_offl_init, &
	240	salsa_nesting_offl_input
	241
[4226]	242	IMPLICIT NONE
	243
	244	!
	245	!-- Define data type for nesting in larger-scale models like COSMO.
	246	!-- Data type comprises u, v, w, pt, and q at lateral and top boundaries.
	247	TYPE nest_offl_type
	248
	249	CHARACTER(LEN=16) :: char_l = 'ls_forcing_left_' !< leading substring for variables at left boundary
	250	CHARACTER(LEN=17) :: char_n = 'ls_forcing_north_' !< leading substring for variables at north boundary
	251	CHARACTER(LEN=17) :: char_r = 'ls_forcing_right_' !< leading substring for variables at right boundary
	252	CHARACTER(LEN=17) :: char_s = 'ls_forcing_south_' !< leading substring for variables at south boundary
	253	CHARACTER(LEN=15) :: char_t = 'ls_forcing_top_' !< leading substring for variables at top boundary
	254
	255	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names !< list of variable in dynamic input file
	256	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_l !< names of mesoscale nested chemistry variables at left boundary
	257	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_n !< names of mesoscale nested chemistry variables at north boundary
	258	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_r !< names of mesoscale nested chemistry variables at right boundary
	259	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_s !< names of mesoscale nested chemistry variables at south boundary
	260	CHARACTER(LEN=100), DIMENSION(:), ALLOCATABLE :: var_names_chem_t !< names of mesoscale nested chemistry variables at top boundary
	261
	262	INTEGER(iwp) :: nt !< number of time levels in dynamic input file
	263	INTEGER(iwp) :: nzu !< number of vertical levels on scalar grid in dynamic input file
	264	INTEGER(iwp) :: nzw !< number of vertical levels on w grid in dynamic input file
	265	INTEGER(iwp) :: tind !< time index for reference time in mesoscale-offline nesting
	266	INTEGER(iwp) :: tind_p !< time index for following time in mesoscale-offline nesting
	267
	268	LOGICAL :: init = .FALSE. !< flag indicating that offline nesting is already initialized
	269
	270	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_l !< flags inidicating whether left boundary data for chemistry is in dynamic input file
	271	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_n !< flags inidicating whether north boundary data for chemistry is in dynamic input file
	272	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_r !< flags inidicating whether right boundary data for chemistry is in dynamic input file
	273	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_s !< flags inidicating whether south boundary data for chemistry is in dynamic input file
	274	LOGICAL, DIMENSION(:), ALLOCATABLE :: chem_from_file_t !< flags inidicating whether top boundary data for chemistry is in dynamic input file
	275
	276	REAL(wp), DIMENSION(:), ALLOCATABLE :: surface_pressure !< time dependent surface pressure
	277	REAL(wp), DIMENSION(:), ALLOCATABLE :: time !< time levels in dynamic input file
	278	REAL(wp), DIMENSION(:), ALLOCATABLE :: zu_atmos !< vertical levels at scalar grid in dynamic input file
	279	REAL(wp), DIMENSION(:), ALLOCATABLE :: zw_atmos !< vertical levels at w grid in dynamic input file
	280
	281	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ug !< domain-averaged geostrophic component
	282	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: vg !< domain-averaged geostrophic component
	283
	284	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_left !< u-component at left boundary
	285	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_left !< v-component at left boundary
	286	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_left !< w-component at left boundary
	287	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_left !< mixing ratio at left boundary
	288	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_left !< potentital temperautre at left boundary
	289
	290	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_north !< u-component at north boundary
	291	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_north !< v-component at north boundary
	292	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_north !< w-component at north boundary
	293	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_north !< mixing ratio at north boundary
	294	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_north !< potentital temperautre at north boundary
	295
	296	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_right !< u-component at right boundary
	297	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_right !< v-component at right boundary
	298	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_right !< w-component at right boundary
	299	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_right !< mixing ratio at right boundary
	300	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_right !< potentital temperautre at right boundary
	301
	302	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_south !< u-component at south boundary
	303	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_south !< v-component at south boundary
	304	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_south !< w-component at south boundary
	305	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_south !< mixing ratio at south boundary
	306	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_south !< potentital temperautre at south boundary
	307
	308	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: u_top !< u-component at top boundary
	309	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: v_top !< v-component at top boundary
	310	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: w_top !< w-component at top boundary
	311	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: q_top !< mixing ratio at top boundary
	312	REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: pt_top !< potentital temperautre at top boundary
	313
	314	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_left !< chemical species at left boundary
	315	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_north !< chemical species at left boundary
	316	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_right !< chemical species at left boundary
	317	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_south !< chemical species at left boundary
	318	REAL(wp), DIMENSION(:,:,:,:), ALLOCATABLE :: chem_top !< chemical species at left boundary
	319
	320	END TYPE nest_offl_type
	321
	322	REAL(wp) :: fac_dt !< interpolation factor
[3347]	323	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
[4226]	324	!< bulk Richardson number of 0.2
	325
	326	TYPE(nest_offl_type) :: nest_offl !< data structure for data input at lateral and top boundaries (provided by Inifor)
[3347]	327
	328	SAVE
	329	PRIVATE
	330	!
	331	!-- Public subroutines
[4022]	332	PUBLIC nesting_offl_bc, &
	333	nesting_offl_calc_zi, &
	334	nesting_offl_check_parameters, &
[4226]	335	nesting_offl_geostrophic_wind, &
[4022]	336	nesting_offl_header, &
	337	nesting_offl_init, &
[4226]	338	nesting_offl_input, &
	339	nesting_offl_interpolation_factor, &
[4022]	340	nesting_offl_mass_conservation, &
	341	nesting_offl_parin
[3347]	342	!
	343	!-- Public variables
	344	PUBLIC zi_ribulk
	345
	346	INTERFACE nesting_offl_bc
	347	MODULE PROCEDURE nesting_offl_bc
	348	END INTERFACE nesting_offl_bc
	349
[4022]	350	INTERFACE nesting_offl_calc_zi
	351	MODULE PROCEDURE nesting_offl_calc_zi
	352	END INTERFACE nesting_offl_calc_zi
	353
[3579]	354	INTERFACE nesting_offl_check_parameters
	355	MODULE PROCEDURE nesting_offl_check_parameters
	356	END INTERFACE nesting_offl_check_parameters
[4226]	357
	358	INTERFACE nesting_offl_geostrophic_wind
	359	MODULE PROCEDURE nesting_offl_geostrophic_wind
	360	END INTERFACE nesting_offl_geostrophic_wind
[3579]	361
[3347]	362	INTERFACE nesting_offl_header
	363	MODULE PROCEDURE nesting_offl_header
	364	END INTERFACE nesting_offl_header
	365
	366	INTERFACE nesting_offl_init
	367	MODULE PROCEDURE nesting_offl_init
	368	END INTERFACE nesting_offl_init
[4226]	369
	370	INTERFACE nesting_offl_input
	371	MODULE PROCEDURE nesting_offl_input
	372	END INTERFACE nesting_offl_input
	373
	374	INTERFACE nesting_offl_interpolation_factor
	375	MODULE PROCEDURE nesting_offl_interpolation_factor
	376	END INTERFACE nesting_offl_interpolation_factor
[3347]	377
	378	INTERFACE nesting_offl_mass_conservation
	379	MODULE PROCEDURE nesting_offl_mass_conservation
	380	END INTERFACE nesting_offl_mass_conservation
	381
	382	INTERFACE nesting_offl_parin
	383	MODULE PROCEDURE nesting_offl_parin
	384	END INTERFACE nesting_offl_parin
	385
	386	CONTAINS
	387
[4226]	388	!------------------------------------------------------------------------------!
	389	! Description:
	390	! ------------
	391	!> Reads data at lateral and top boundaries derived from larger-scale model.
	392	!------------------------------------------------------------------------------!
	393	SUBROUTINE nesting_offl_input
[3347]	394
[4226]	395	INTEGER(iwp) :: n !< running index for chemistry variables
	396
	397	!
	398	!-- Initialize INIFOR forcing in first call.
	399	IF ( .NOT. nest_offl%init ) THEN
	400	#if defined ( __netcdf )
	401	!
	402	!-- Open file in read-only mode
	403	CALL open_read_file( TRIM( input_file_dynamic ) // &
	404	TRIM( coupling_char ), pids_id )
	405	!
	406	!-- At first, inquire all variable names.
	407	CALL inquire_num_variables( pids_id, num_var_pids )
	408	!
	409	!-- Allocate memory to store variable names.
	410	ALLOCATE( nest_offl%var_names(1:num_var_pids) )
	411	CALL inquire_variable_names( pids_id, nest_offl%var_names )
	412	!
	413	!-- Read time dimension, allocate memory and finally read time array
	414	CALL get_dimension_length( pids_id, nest_offl%nt, 'time' )
	415
	416	IF ( check_existence( nest_offl%var_names, 'time' ) ) THEN
	417	ALLOCATE( nest_offl%time(0:nest_offl%nt-1) )
	418	CALL get_variable( pids_id, 'time', nest_offl%time )
	419	ENDIF
	420	!
	421	!-- Read vertical dimension of scalar und w grid
	422	CALL get_dimension_length( pids_id, nest_offl%nzu, 'z' )
	423	CALL get_dimension_length( pids_id, nest_offl%nzw, 'zw' )
	424
	425	IF ( check_existence( nest_offl%var_names, 'z' ) ) THEN
	426	ALLOCATE( nest_offl%zu_atmos(1:nest_offl%nzu) )
	427	CALL get_variable( pids_id, 'z', nest_offl%zu_atmos )
	428	ENDIF
	429	IF ( check_existence( nest_offl%var_names, 'zw' ) ) THEN
	430	ALLOCATE( nest_offl%zw_atmos(1:nest_offl%nzw) )
	431	CALL get_variable( pids_id, 'zw', nest_offl%zw_atmos )
	432	ENDIF
	433	!
	434	!-- Read surface pressure
	435	IF ( check_existence( nest_offl%var_names, &
	436	'surface_forcing_surface_pressure' ) ) THEN
	437	ALLOCATE( nest_offl%surface_pressure(0:nest_offl%nt-1) )
	438	CALL get_variable( pids_id, &
	439	'surface_forcing_surface_pressure', &
	440	nest_offl%surface_pressure )
	441	ENDIF
	442	!
	443	!-- Close input file
	444	CALL close_input_file( pids_id )
	445	#endif
	446	ENDIF
	447	!
	448	!-- Check if dynamic driver data input is required.
	449	IF ( nest_offl%time(nest_offl%tind_p) <= &
[4358]	450	MAX( time_since_reference_point, 0.0_wp) .OR. &
[4226]	451	.NOT. nest_offl%init ) THEN
	452	CONTINUE
	453	!
	454	!-- Return otherwise
	455	ELSE
	456	RETURN
	457	ENDIF
	458	!
	459	!-- CPU measurement
	460	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'start' )
	461
	462	!
	463	!-- Obtain time index for current point in time. Note, the time coordinate
[4358]	464	!-- in the input file is always relative to the initial time in UTC, i.e.
	465	!-- the time coordinate always starts at 0.0 even if the initial UTC is e.g.
	466	!-- 7200.0. Further, since time_since_reference_point is negativ here when
	467	!-- spinup is applied, use MAX function to obtain correct time index.
	468	nest_offl%tind = MINLOC( ABS( nest_offl%time - &
	469	MAX( time_since_reference_point, 0.0_wp) &
[4226]	470	), DIM = 1 ) - 1
	471	nest_offl%tind_p = nest_offl%tind + 1
	472	!
	473	!-- Open file in read-only mode
	474	#if defined ( __netcdf )
	475	CALL open_read_file( TRIM( input_file_dynamic ) // &
	476	TRIM( coupling_char ), pids_id )
	477	!
	478	!-- Read geostrophic wind components
[4581]	479	! DO t = nest_offl%tind, nest_offl%tind_p
	480	! CALL get_variable_pr( pids_id, 'ls_forcing_ug', t+1, &
	481	! nest_offl%ug(t-nest_offl%tind,nzb+1:nzt) )
	482	! CALL get_variable_pr( pids_id, 'ls_forcing_vg', t+1, &
	483	! nest_offl%vg(t-nest_offl%tind,nzb+1:nzt) )
	484	! ENDDO
[4226]	485	!
	486	!-- Read data at lateral and top boundaries. Please note, at left and
	487	!-- right domain boundary, yz-layers are read for u, v, w, pt and q.
	488	!-- For the v-component, the data starts at nysv, while for the other
	489	!-- quantities the data starts at nys. This is equivalent at the north
	490	!-- and south domain boundary for the u-component.
	491	!-- Note, lateral data is also accessed by parallel IO, which is the reason
	492	!-- why different arguments are passed depending on the boundary control
	493	!-- flags. Cores that do not belong to the respective boundary just make
	494	!-- a dummy read with count = 0, just in order to participate the collective
	495	!-- operation.
	496	!-- Read data for western boundary
	497	CALL get_variable( pids_id, 'ls_forcing_left_u', &
	498	nest_offl%u_left, & ! array to be read
	499	MERGE( nys+1, 1, bc_dirichlet_l), & ! start index y direction
	500	MERGE( nzb+1, 1, bc_dirichlet_l), & ! start index z direction
	501	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), & ! start index time dimension
	502	MERGE( nyn-nys+1, 0, bc_dirichlet_l), & ! number of elements along y
	503	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), & ! number of elements alogn z
	504	MERGE( 2, 0, bc_dirichlet_l), & ! number of time steps (2 or 0)
	505	.TRUE. ) ! parallel IO when compiled accordingly
	506
	507	CALL get_variable( pids_id, 'ls_forcing_left_v', &
	508	nest_offl%v_left, &
	509	MERGE( nysv, 1, bc_dirichlet_l), &
	510	MERGE( nzb+1, 1, bc_dirichlet_l), &
	511	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
	512	MERGE( nyn-nysv+1, 0, bc_dirichlet_l), &
	513	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
	514	MERGE( 2, 0, bc_dirichlet_l), &
	515	.TRUE. )
	516
	517	CALL get_variable( pids_id, 'ls_forcing_left_w', &
	518	nest_offl%w_left, &
	519	MERGE( nys+1, 1, bc_dirichlet_l), &
	520	MERGE( nzb+1, 1, bc_dirichlet_l), &
	521	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
	522	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
	523	MERGE( nest_offl%nzw, 0, bc_dirichlet_l), &
	524	MERGE( 2, 0, bc_dirichlet_l), &
	525	.TRUE. )
	526
	527	IF ( .NOT. neutral ) THEN
	528	CALL get_variable( pids_id, 'ls_forcing_left_pt', &
	529	nest_offl%pt_left, &
	530	MERGE( nys+1, 1, bc_dirichlet_l), &
	531	MERGE( nzb+1, 1, bc_dirichlet_l), &
	532	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
	533	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
	534	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
	535	MERGE( 2, 0, bc_dirichlet_l), &
	536	.TRUE. )
	537	ENDIF
	538
	539	IF ( humidity ) THEN
	540	CALL get_variable( pids_id, 'ls_forcing_left_qv', &
	541	nest_offl%q_left, &
	542	MERGE( nys+1, 1, bc_dirichlet_l), &
	543	MERGE( nzb+1, 1, bc_dirichlet_l), &
	544	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
	545	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
	546	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
	547	MERGE( 2, 0, bc_dirichlet_l), &
	548	.TRUE. )
	549	ENDIF
[4273]	550
	551	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[4226]	552	DO n = 1, UBOUND(nest_offl%var_names_chem_l, 1)
	553	IF ( check_existence( nest_offl%var_names, &
[4273]	554	nest_offl%var_names_chem_l(n) ) ) THEN
[4226]	555	CALL get_variable( pids_id, &
	556	TRIM( nest_offl%var_names_chem_l(n) ), &
	557	nest_offl%chem_left(:,:,:,n), &
	558	MERGE( nys+1, 1, bc_dirichlet_l), &
	559	MERGE( nzb+1, 1, bc_dirichlet_l), &
	560	MERGE( nest_offl%tind+1, 1, bc_dirichlet_l), &
	561	MERGE( nyn-nys+1, 0, bc_dirichlet_l), &
	562	MERGE( nest_offl%nzu, 0, bc_dirichlet_l), &
	563	MERGE( 2, 0, bc_dirichlet_l), &
	564	.TRUE. )
	565	nest_offl%chem_from_file_l(n) = .TRUE.
	566	ENDIF
	567	ENDDO
	568	ENDIF
	569	!
	570	!-- Read data for eastern boundary
	571	CALL get_variable( pids_id, 'ls_forcing_right_u', &
	572	nest_offl%u_right, &
	573	MERGE( nys+1, 1, bc_dirichlet_r), &
	574	MERGE( nzb+1, 1, bc_dirichlet_r), &
	575	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
	576	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
	577	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
	578	MERGE( 2, 0, bc_dirichlet_r), &
	579	.TRUE. )
	580
	581	CALL get_variable( pids_id, 'ls_forcing_right_v', &
	582	nest_offl%v_right, &
	583	MERGE( nysv, 1, bc_dirichlet_r), &
	584	MERGE( nzb+1, 1, bc_dirichlet_r), &
	585	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
	586	MERGE( nyn-nysv+1, 0, bc_dirichlet_r), &
	587	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
	588	MERGE( 2, 0, bc_dirichlet_r), &
	589	.TRUE. )
	590
	591	CALL get_variable( pids_id, 'ls_forcing_right_w', &
	592	nest_offl%w_right, &
	593	MERGE( nys+1, 1, bc_dirichlet_r), &
	594	MERGE( nzb+1, 1, bc_dirichlet_r), &
	595	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
	596	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
	597	MERGE( nest_offl%nzw, 0, bc_dirichlet_r), &
	598	MERGE( 2, 0, bc_dirichlet_r), &
	599	.TRUE. )
	600
	601	IF ( .NOT. neutral ) THEN
	602	CALL get_variable( pids_id, 'ls_forcing_right_pt', &
	603	nest_offl%pt_right, &
	604	MERGE( nys+1, 1, bc_dirichlet_r), &
	605	MERGE( nzb+1, 1, bc_dirichlet_r), &
	606	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
	607	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
	608	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
	609	MERGE( 2, 0, bc_dirichlet_r), &
	610	.TRUE. )
	611	ENDIF
	612
	613	IF ( humidity ) THEN
	614	CALL get_variable( pids_id, 'ls_forcing_right_qv', &
	615	nest_offl%q_right, &
	616	MERGE( nys+1, 1, bc_dirichlet_r), &
	617	MERGE( nzb+1, 1, bc_dirichlet_r), &
	618	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
	619	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
	620	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
	621	MERGE( 2, 0, bc_dirichlet_r), &
	622	.TRUE. )
	623	ENDIF
[4273]	624
	625	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[4226]	626	DO n = 1, UBOUND(nest_offl%var_names_chem_r, 1)
	627	IF ( check_existence( nest_offl%var_names, &
[4273]	628	nest_offl%var_names_chem_r(n) ) ) THEN
[4226]	629	CALL get_variable( pids_id, &
	630	TRIM( nest_offl%var_names_chem_r(n) ), &
	631	nest_offl%chem_right(:,:,:,n), &
	632	MERGE( nys+1, 1, bc_dirichlet_r), &
	633	MERGE( nzb+1, 1, bc_dirichlet_r), &
	634	MERGE( nest_offl%tind+1, 1, bc_dirichlet_r), &
	635	MERGE( nyn-nys+1, 0, bc_dirichlet_r), &
	636	MERGE( nest_offl%nzu, 0, bc_dirichlet_r), &
	637	MERGE( 2, 0, bc_dirichlet_r), &
	638	.TRUE. )
	639	nest_offl%chem_from_file_r(n) = .TRUE.
	640	ENDIF
	641	ENDDO
	642	ENDIF
	643	!
	644	!-- Read data for northern boundary
	645	CALL get_variable( pids_id, 'ls_forcing_north_u', & ! array to be read
	646	nest_offl%u_north, & ! start index x direction
	647	MERGE( nxlu, 1, bc_dirichlet_n ), & ! start index z direction
	648	MERGE( nzb+1, 1, bc_dirichlet_n ), & ! start index time dimension
	649	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), & ! number of elements along x
	650	MERGE( nxr-nxlu+1, 0, bc_dirichlet_n ), & ! number of elements alogn z
	651	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), & ! number of time steps (2 or 0)
	652	MERGE( 2, 0, bc_dirichlet_n ), & ! parallel IO when compiled accordingly
[4273]	653	.TRUE. )
	654
[4226]	655	CALL get_variable( pids_id, 'ls_forcing_north_v', & ! array to be read
	656	nest_offl%v_north, & ! start index x direction
	657	MERGE( nxl+1, 1, bc_dirichlet_n ), & ! start index z direction
	658	MERGE( nzb+1, 1, bc_dirichlet_n ), & ! start index time dimension
	659	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), & ! number of elements along x
	660	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), & ! number of elements alogn z
	661	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), & ! number of time steps (2 or 0)
	662	MERGE( 2, 0, bc_dirichlet_n ), & ! parallel IO when compiled accordingly
[4273]	663	.TRUE. )
	664
[4226]	665	CALL get_variable( pids_id, 'ls_forcing_north_w', & ! array to be read
	666	nest_offl%w_north, & ! start index x direction
	667	MERGE( nxl+1, 1, bc_dirichlet_n ), & ! start index z direction
	668	MERGE( nzb+1, 1, bc_dirichlet_n ), & ! start index time dimension
	669	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), & ! number of elements along x
	670	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), & ! number of elements alogn z
	671	MERGE( nest_offl%nzw, 0, bc_dirichlet_n ), & ! number of time steps (2 or 0)
	672	MERGE( 2, 0, bc_dirichlet_n ), & ! parallel IO when compiled accordingly
[4273]	673	.TRUE. )
	674
	675	IF ( .NOT. neutral ) THEN
[4226]	676	CALL get_variable( pids_id, 'ls_forcing_north_pt', & ! array to be read
	677	nest_offl%pt_north, & ! start index x direction
	678	MERGE( nxl+1, 1, bc_dirichlet_n ), & ! start index z direction
	679	MERGE( nzb+1, 1, bc_dirichlet_n ), & ! start index time dimension
	680	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), & ! number of elements along x
	681	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), & ! number of elements alogn z
	682	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), & ! number of time steps (2 or 0)
	683	MERGE( 2, 0, bc_dirichlet_n ), & ! parallel IO when compiled accordingly
[4273]	684	.TRUE. )
	685	ENDIF
	686	IF ( humidity ) THEN
[4226]	687	CALL get_variable( pids_id, 'ls_forcing_north_qv', & ! array to be read
	688	nest_offl%q_north, & ! start index x direction
	689	MERGE( nxl+1, 1, bc_dirichlet_n ), & ! start index z direction
	690	MERGE( nzb+1, 1, bc_dirichlet_n ), & ! start index time dimension
	691	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), & ! number of elements along x
	692	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), & ! number of elements alogn z
	693	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), & ! number of time steps (2 or 0)
	694	MERGE( 2, 0, bc_dirichlet_n ), & ! parallel IO when compiled accordingly
[4273]	695	.TRUE. )
	696	ENDIF
	697
	698	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
	699	DO n = 1, UBOUND(nest_offl%var_names_chem_n, 1)
[4226]	700	IF ( check_existence( nest_offl%var_names, &
[4273]	701	nest_offl%var_names_chem_n(n) ) ) THEN
[4226]	702	CALL get_variable( pids_id, &
	703	TRIM( nest_offl%var_names_chem_n(n) ), &
	704	nest_offl%chem_north(:,:,:,n), &
	705	MERGE( nxl+1, 1, bc_dirichlet_n ), &
	706	MERGE( nzb+1, 1, bc_dirichlet_n ), &
	707	MERGE( nest_offl%tind+1, 1, bc_dirichlet_n ), &
	708	MERGE( nxr-nxl+1, 0, bc_dirichlet_n ), &
	709	MERGE( nest_offl%nzu, 0, bc_dirichlet_n ), &
	710	MERGE( 2, 0, bc_dirichlet_n ), &
	711	.TRUE. )
	712	nest_offl%chem_from_file_n(n) = .TRUE.
	713	ENDIF
	714	ENDDO
	715	ENDIF
	716	!
	717	!-- Read data for southern boundary
	718	CALL get_variable( pids_id, 'ls_forcing_south_u', & ! array to be read
	719	nest_offl%u_south, & ! start index x direction
	720	MERGE( nxlu, 1, bc_dirichlet_s ), & ! start index z direction
	721	MERGE( nzb+1, 1, bc_dirichlet_s ), & ! start index time dimension
	722	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), & ! number of elements along x
	723	MERGE( nxr-nxlu+1, 0, bc_dirichlet_s ), & ! number of elements alogn z
	724	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), & ! number of time steps (2 or 0)
	725	MERGE( 2, 0, bc_dirichlet_s ), & ! parallel IO when compiled accordingly
[4273]	726	.TRUE. )
	727
[4226]	728	CALL get_variable( pids_id, 'ls_forcing_south_v', & ! array to be read
	729	nest_offl%v_south, & ! start index x direction
	730	MERGE( nxl+1, 1, bc_dirichlet_s ), & ! start index z direction
	731	MERGE( nzb+1, 1, bc_dirichlet_s ), & ! start index time dimension
	732	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), & ! number of elements along x
	733	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), & ! number of elements alogn z
	734	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), & ! number of time steps (2 or 0)
	735	MERGE( 2, 0, bc_dirichlet_s ), & ! parallel IO when compiled accordingly
[4273]	736	.TRUE. )
	737
[4226]	738	CALL get_variable( pids_id, 'ls_forcing_south_w', & ! array to be read
	739	nest_offl%w_south, & ! start index x direction
	740	MERGE( nxl+1, 1, bc_dirichlet_s ), & ! start index z direction
	741	MERGE( nzb+1, 1, bc_dirichlet_s ), & ! start index time dimension
	742	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), & ! number of elements along x
	743	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), & ! number of elements alogn z
	744	MERGE( nest_offl%nzw, 0, bc_dirichlet_s ), & ! number of time steps (2 or 0)
	745	MERGE( 2, 0, bc_dirichlet_s ), & ! parallel IO when compiled accordingly
[4273]	746	.TRUE. )
	747
	748	IF ( .NOT. neutral ) THEN
[4226]	749	CALL get_variable( pids_id, 'ls_forcing_south_pt', & ! array to be read
	750	nest_offl%pt_south, & ! start index x direction
	751	MERGE( nxl+1, 1, bc_dirichlet_s ), & ! start index z direction
	752	MERGE( nzb+1, 1, bc_dirichlet_s ), & ! start index time dimension
	753	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), & ! number of elements along x
	754	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), & ! number of elements alogn z
	755	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), & ! number of time steps (2 or 0)
	756	MERGE( 2, 0, bc_dirichlet_s ), & ! parallel IO when compiled accordingly
[4273]	757	.TRUE. )
	758	ENDIF
	759	IF ( humidity ) THEN
[4226]	760	CALL get_variable( pids_id, 'ls_forcing_south_qv', & ! array to be read
	761	nest_offl%q_south, & ! start index x direction
	762	MERGE( nxl+1, 1, bc_dirichlet_s ), & ! start index z direction
	763	MERGE( nzb+1, 1, bc_dirichlet_s ), & ! start index time dimension
	764	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), & ! number of elements along x
	765	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), & ! number of elements alogn z
	766	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), & ! number of time steps (2 or 0)
	767	MERGE( 2, 0, bc_dirichlet_s ), & ! parallel IO when compiled accordingly
[4273]	768	.TRUE. )
	769	ENDIF
	770
	771	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
	772	DO n = 1, UBOUND(nest_offl%var_names_chem_s, 1)
[4226]	773	IF ( check_existence( nest_offl%var_names, &
[4273]	774	nest_offl%var_names_chem_s(n) ) ) THEN
[4226]	775	CALL get_variable( pids_id, &
	776	TRIM( nest_offl%var_names_chem_s(n) ), &
	777	nest_offl%chem_south(:,:,:,n), &
	778	MERGE( nxl+1, 1, bc_dirichlet_s ), &
	779	MERGE( nzb+1, 1, bc_dirichlet_s ), &
	780	MERGE( nest_offl%tind+1, 1, bc_dirichlet_s ), &
	781	MERGE( nxr-nxl+1, 0, bc_dirichlet_s ), &
	782	MERGE( nest_offl%nzu, 0, bc_dirichlet_s ), &
	783	MERGE( 2, 0, bc_dirichlet_s ), &
	784	.TRUE. )
	785	nest_offl%chem_from_file_s(n) = .TRUE.
	786	ENDIF
	787	ENDDO
	788	ENDIF
	789	!
	790	!-- Top boundary
	791	CALL get_variable( pids_id, 'ls_forcing_top_u', &
	792	nest_offl%u_top(0:1,nys:nyn,nxlu:nxr), &
	793	nxlu, nys+1, nest_offl%tind+1, &
	794	nxr-nxlu+1, nyn-nys+1, 2, .TRUE. )
	795
	796	CALL get_variable( pids_id, 'ls_forcing_top_v', &
	797	nest_offl%v_top(0:1,nysv:nyn,nxl:nxr), &
	798	nxl+1, nysv, nest_offl%tind+1, &
	799	nxr-nxl+1, nyn-nysv+1, 2, .TRUE. )
[4273]	800
[4226]	801	CALL get_variable( pids_id, 'ls_forcing_top_w', &
	802	nest_offl%w_top(0:1,nys:nyn,nxl:nxr), &
	803	nxl+1, nys+1, nest_offl%tind+1, &
	804	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
[4273]	805
[4226]	806	IF ( .NOT. neutral ) THEN
	807	CALL get_variable( pids_id, 'ls_forcing_top_pt', &
	808	nest_offl%pt_top(0:1,nys:nyn,nxl:nxr), &
	809	nxl+1, nys+1, nest_offl%tind+1, &
	810	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
	811	ENDIF
	812	IF ( humidity ) THEN
	813	CALL get_variable( pids_id, 'ls_forcing_top_qv', &
	814	nest_offl%q_top(0:1,nys:nyn,nxl:nxr), &
	815	nxl+1, nys+1, nest_offl%tind+1, &
	816	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
	817	ENDIF
[4273]	818
	819	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[4226]	820	DO n = 1, UBOUND(nest_offl%var_names_chem_t, 1)
	821	IF ( check_existence( nest_offl%var_names, &
[4273]	822	nest_offl%var_names_chem_t(n) ) ) THEN
[4226]	823	CALL get_variable( pids_id, &
	824	TRIM( nest_offl%var_names_chem_t(n) ), &
	825	nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,n), &
	826	nxl+1, nys+1, nest_offl%tind+1, &
	827	nxr-nxl+1, nyn-nys+1, 2, .TRUE. )
	828	nest_offl%chem_from_file_t(n) = .TRUE.
	829	ENDIF
	830	ENDDO
	831	ENDIF
	832
	833	!
	834	!-- Close input file
	835	CALL close_input_file( pids_id )
	836	#endif
	837	!
	838	!-- Set control flag to indicate that boundary data has been initially
	839	!-- input.
	840	nest_offl%init = .TRUE.
	841	!
[4270]	842	!-- Call offline nesting for salsa
	843	IF ( salsa ) CALL salsa_nesting_offl_input
	844	!
[4226]	845	!-- End of CPU measurement
	846	CALL cpu_log( log_point_s(86), 'NetCDF input forcing', 'stop' )
	847
	848	END SUBROUTINE nesting_offl_input
	849
	850
[3347]	851	!------------------------------------------------------------------------------!
	852	! Description:
	853	! ------------
	854	!> In this subroutine a constant mass within the model domain is guaranteed.
	855	!> Larger-scale models may be based on a compressible equation system, which is
	856	!> not consistent with PALMs incompressible equation system. In order to avoid
	857	!> a decrease or increase of mass during the simulation, non-divergent flow
	858	!> through the lateral and top boundaries is compensated by the vertical wind
	859	!> component at the top boundary.
	860	!------------------------------------------------------------------------------!
	861	SUBROUTINE nesting_offl_mass_conservation
	862
	863	INTEGER(iwp) :: i !< grid index in x-direction
	864	INTEGER(iwp) :: j !< grid index in y-direction
	865	INTEGER(iwp) :: k !< grid index in z-direction
	866
	867	REAL(wp) :: d_area_t !< inverse of the total area of the horizontal model domain
	868	REAL(wp) :: w_correct !< vertical velocity increment required to compensate non-divergent flow through the boundaries
	869	REAL(wp), DIMENSION(1:3) :: volume_flow_l !< local volume flow
	870
[3987]	871
	872	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'start' )
	873
[3347]	874	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
	875
	876	volume_flow = 0.0_wp
	877	volume_flow_l = 0.0_wp
	878
	879	d_area_t = 1.0_wp / ( ( nx + 1 ) * dx * ( ny + 1 ) * dy )
	880
	881	IF ( bc_dirichlet_l ) THEN
	882	i = nxl
	883	DO j = nys, nyn
	884	DO k = nzb+1, nzt
	885	volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) * dy &
[4561]	886	* rho_air(k) &
[3347]	887	* MERGE( 1.0_wp, 0.0_wp, &
[4561]	888	BTEST( wall_flags_total_0(k,j,i), 1 ) )
[3347]	889	ENDDO
	890	ENDDO
	891	ENDIF
	892	IF ( bc_dirichlet_r ) THEN
	893	i = nxr+1
	894	DO j = nys, nyn
	895	DO k = nzb+1, nzt
	896	volume_flow_l(1) = volume_flow_l(1) - u(k,j,i) * dzw(k) * dy &
[4561]	897	* rho_air(k) &
[3347]	898	* MERGE( 1.0_wp, 0.0_wp, &
[4561]	899	BTEST( wall_flags_total_0(k,j,i), 1 ) )
[3347]	900	ENDDO
	901	ENDDO
	902	ENDIF
	903	IF ( bc_dirichlet_s ) THEN
	904	j = nys
	905	DO i = nxl, nxr
	906	DO k = nzb+1, nzt
	907	volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) * dx &
[4561]	908	* rho_air(k) &
[3347]	909	* MERGE( 1.0_wp, 0.0_wp, &
[4561]	910	BTEST( wall_flags_total_0(k,j,i), 2 ) )
[3347]	911	ENDDO
	912	ENDDO
	913	ENDIF
	914	IF ( bc_dirichlet_n ) THEN
	915	j = nyn+1
	916	DO i = nxl, nxr
	917	DO k = nzb+1, nzt
	918	volume_flow_l(2) = volume_flow_l(2) - v(k,j,i) * dzw(k) * dx &
[4561]	919	* rho_air(k) &
[3347]	920	* MERGE( 1.0_wp, 0.0_wp, &
[4561]	921	BTEST( wall_flags_total_0(k,j,i), 2 ) )
[3347]	922	ENDDO
	923	ENDDO
	924	ENDIF
	925	!
	926	!-- Top boundary
	927	k = nzt
	928	DO i = nxl, nxr
	929	DO j = nys, nyn
[4561]	930	volume_flow_l(3) = volume_flow_l(3) - rho_air_zw(k) * w(k,j,i) * dx * dy
[3347]	931	ENDDO
	932	ENDDO
	933
	934	#if defined( __parallel )
	935	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[4226]	936	CALL MPI_ALLREDUCE( volume_flow_l, volume_flow, 3, MPI_REAL, MPI_SUM, &
[3347]	937	comm2d, ierr )
	938	#else
	939	volume_flow = volume_flow_l
	940	#endif
	941
[4561]	942	w_correct = SUM( volume_flow ) * d_area_t * drho_air_zw(nzt)
[3347]	943
	944	DO i = nxl, nxr
	945	DO j = nys, nyn
	946	DO k = nzt, nzt + 1
[4561]	947	w(k,j,i) = w(k,j,i) + w_correct &
	948	* MERGE( 1.0_wp, 0.0_wp, &
	949	BTEST( wall_flags_total_0(k,j,i), 3 ) )
[3347]	950	ENDDO
	951	ENDDO
	952	ENDDO
	953
	954	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
	955
[3987]	956	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_mass_conservation', 'end' )
	957
[3347]	958	END SUBROUTINE nesting_offl_mass_conservation
	959
	960
	961	!------------------------------------------------------------------------------!
	962	! Description:
	963	! ------------
	964	!> Set the lateral and top boundary conditions in case the PALM domain is
	965	!> nested offline in a mesoscale model. Further, average boundary data and
	966	!> determine mean profiles, further used for correct damping in the sponge
	967	!> layer.
	968	!------------------------------------------------------------------------------!
	969	SUBROUTINE nesting_offl_bc
	970
[4457]	971	USE exchange_horiz_mod, &
	972	ONLY: exchange_horiz
	973
[3347]	974	INTEGER(iwp) :: i !< running index x-direction
	975	INTEGER(iwp) :: j !< running index y-direction
	976	INTEGER(iwp) :: k !< running index z-direction
[3737]	977	INTEGER(iwp) :: n !< running index for chemical species
[3347]	978
	979	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref !< reference profile for potential temperature
	980	REAL(wp), DIMENSION(nzb:nzt+1) :: pt_ref_l !< reference profile for potential temperature on subdomain
[4230]	981	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref !< reference profile for mixing ratio
[3347]	982	REAL(wp), DIMENSION(nzb:nzt+1) :: q_ref_l !< reference profile for mixing ratio on subdomain
[4230]	983	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref !< reference profile for u-component
[3347]	984	REAL(wp), DIMENSION(nzb:nzt+1) :: u_ref_l !< reference profile for u-component on subdomain
[4230]	985	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref !< reference profile for v-component
[3347]	986	REAL(wp), DIMENSION(nzb:nzt+1) :: v_ref_l !< reference profile for v-component on subdomain
[3885]	987
[4230]	988	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem !< reference profile for chemical species
	989	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ref_chem_l !< reference profile for chemical species on subdomain
	990
[3987]	991	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'start' )
	992
[3347]	993	CALL cpu_log( log_point(58), 'offline nesting', 'start' )
	994	!
[4230]	995	!-- Initialize mean profiles, derived from boundary data, to zero
[3347]	996	pt_ref = 0.0_wp
	997	q_ref = 0.0_wp
	998	u_ref = 0.0_wp
	999	v_ref = 0.0_wp
[4273]	1000
[3347]	1001	pt_ref_l = 0.0_wp
	1002	q_ref_l = 0.0_wp
	1003	u_ref_l = 0.0_wp
	1004	v_ref_l = 0.0_wp
	1005	!
[4230]	1006	!-- If required, allocate temporary arrays to compute chemistry mean profiles
[4273]	1007	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[4230]	1008	ALLOCATE( ref_chem(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
	1009	ALLOCATE( ref_chem_l(nzb:nzt+1,1:UBOUND( chem_species, 1 ) ) )
	1010	ref_chem = 0.0_wp
	1011	ref_chem_l = 0.0_wp
	1012	ENDIF
	1013	!
[3347]	1014	!-- Set boundary conditions of u-, v-, w-component, as well as q, and pt.
	1015	!-- Note, boundary values at the left boundary: i=-1 (v,w,pt,q) and
	1016	!-- i=0 (u), at the right boundary: i=nxr+1 (all), at the south boundary:
	1017	!-- j=-1 (u,w,pt,q) and j=0 (v), at the north boundary: j=nyn+1 (all).
	1018	!-- Please note, at the left (for u) and south (for v) boundary, values
	1019	!-- for u and v are set also at i/j=-1, since these values are used in
	1020	!-- boundary_conditions() to restore prognostic values.
	1021	!-- Further, sum up data to calculate mean profiles from boundary data,
	1022	!-- used for Rayleigh damping.
	1023	IF ( bc_dirichlet_l ) THEN
	1024
	1025	DO j = nys, nyn
	1026	DO k = nzb+1, nzt
	1027	u(k,j,0) = interpolate_in_time( nest_offl%u_left(0,k,j), &
	1028	nest_offl%u_left(1,k,j), &
	1029	fac_dt ) * &
	1030	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1031	BTEST( wall_flags_total_0(k,j,0), 1 ) )
[3347]	1032	u(k,j,-1) = u(k,j,0)
	1033	ENDDO
	1034	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,0)
	1035	ENDDO
	1036
	1037	DO j = nys, nyn
	1038	DO k = nzb+1, nzt-1
	1039	w(k,j,-1) = interpolate_in_time( nest_offl%w_left(0,k,j), &
	1040	nest_offl%w_left(1,k,j), &
	1041	fac_dt ) * &
	1042	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1043	BTEST( wall_flags_total_0(k,j,-1), 3 ) )
[3347]	1044	ENDDO
[4079]	1045	w(nzt,j,-1) = w(nzt-1,j,-1)
[3347]	1046	ENDDO
	1047
	1048	DO j = nysv, nyn
	1049	DO k = nzb+1, nzt
	1050	v(k,j,-1) = interpolate_in_time( nest_offl%v_left(0,k,j), &
	1051	nest_offl%v_left(1,k,j), &
	1052	fac_dt ) * &
	1053	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1054	BTEST( wall_flags_total_0(k,j,-1), 2 ) )
[3347]	1055	ENDDO
	1056	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,-1)
	1057	ENDDO
	1058
	1059	IF ( .NOT. neutral ) THEN
	1060	DO j = nys, nyn
	1061	DO k = nzb+1, nzt
	1062	pt(k,j,-1) = interpolate_in_time( nest_offl%pt_left(0,k,j), &
	1063	nest_offl%pt_left(1,k,j), &
	1064	fac_dt )
	1065
	1066	ENDDO
	1067	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,-1)
	1068	ENDDO
	1069	ENDIF
	1070
	1071	IF ( humidity ) THEN
	1072	DO j = nys, nyn
	1073	DO k = nzb+1, nzt
	1074	q(k,j,-1) = interpolate_in_time( nest_offl%q_left(0,k,j), &
	1075	nest_offl%q_left(1,k,j), &
	1076	fac_dt )
	1077
	1078	ENDDO
	1079	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,-1)
	1080	ENDDO
	1081	ENDIF
[4273]	1082
	1083	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	1084	DO n = 1, UBOUND( chem_species, 1 )
[4273]	1085	IF ( nest_offl%chem_from_file_l(n) ) THEN
[3737]	1086	DO j = nys, nyn
	1087	DO k = nzb+1, nzt
	1088	chem_species(n)%conc(k,j,-1) = interpolate_in_time( &
	1089	nest_offl%chem_left(0,k,j,n),&
	1090	nest_offl%chem_left(1,k,j,n),&
	1091	fac_dt )
	1092	ENDDO
[4230]	1093	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
	1094	+ chem_species(n)%conc(nzb+1:nzt,j,-1)
[3737]	1095	ENDDO
	1096	ENDIF
	1097	ENDDO
	1098	ENDIF
[3347]	1099
	1100	ENDIF
	1101
	1102	IF ( bc_dirichlet_r ) THEN
	1103
	1104	DO j = nys, nyn
	1105	DO k = nzb+1, nzt
	1106	u(k,j,nxr+1) = interpolate_in_time( nest_offl%u_right(0,k,j), &
	1107	nest_offl%u_right(1,k,j), &
	1108	fac_dt ) * &
	1109	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1110	BTEST( wall_flags_total_0(k,j,nxr+1), 1 ) )
[3347]	1111	ENDDO
	1112	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,j,nxr+1)
	1113	ENDDO
	1114	DO j = nys, nyn
	1115	DO k = nzb+1, nzt-1
	1116	w(k,j,nxr+1) = interpolate_in_time( nest_offl%w_right(0,k,j), &
	1117	nest_offl%w_right(1,k,j), &
	1118	fac_dt ) * &
	1119	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1120	BTEST( wall_flags_total_0(k,j,nxr+1), 3 ) )
[3347]	1121	ENDDO
[4079]	1122	w(nzt,j,nxr+1) = w(nzt-1,j,nxr+1)
[3347]	1123	ENDDO
	1124
	1125	DO j = nysv, nyn
	1126	DO k = nzb+1, nzt
	1127	v(k,j,nxr+1) = interpolate_in_time( nest_offl%v_right(0,k,j), &
	1128	nest_offl%v_right(1,k,j), &
	1129	fac_dt ) * &
	1130	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1131	BTEST( wall_flags_total_0(k,j,nxr+1), 2 ) )
[3347]	1132	ENDDO
	1133	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,j,nxr+1)
	1134	ENDDO
	1135
	1136	IF ( .NOT. neutral ) THEN
	1137	DO j = nys, nyn
	1138	DO k = nzb+1, nzt
	1139	pt(k,j,nxr+1) = interpolate_in_time( &
	1140	nest_offl%pt_right(0,k,j), &
	1141	nest_offl%pt_right(1,k,j), &
	1142	fac_dt )
	1143	ENDDO
	1144	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,j,nxr+1)
	1145	ENDDO
	1146	ENDIF
	1147
	1148	IF ( humidity ) THEN
	1149	DO j = nys, nyn
	1150	DO k = nzb+1, nzt
	1151	q(k,j,nxr+1) = interpolate_in_time( &
	1152	nest_offl%q_right(0,k,j), &
	1153	nest_offl%q_right(1,k,j), &
	1154	fac_dt )
	1155
	1156	ENDDO
	1157	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,j,nxr+1)
	1158	ENDDO
	1159	ENDIF
[4273]	1160
	1161	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	1162	DO n = 1, UBOUND( chem_species, 1 )
[4273]	1163	IF ( nest_offl%chem_from_file_r(n) ) THEN
[3737]	1164	DO j = nys, nyn
	1165	DO k = nzb+1, nzt
	1166	chem_species(n)%conc(k,j,nxr+1) = interpolate_in_time(&
	1167	nest_offl%chem_right(0,k,j,n),&
	1168	nest_offl%chem_right(1,k,j,n),&
	1169	fac_dt )
	1170	ENDDO
[4230]	1171	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
	1172	+ chem_species(n)%conc(nzb+1:nzt,j,nxr+1)
[3737]	1173	ENDDO
	1174	ENDIF
	1175	ENDDO
	1176	ENDIF
[3347]	1177
	1178	ENDIF
	1179
	1180	IF ( bc_dirichlet_s ) THEN
	1181
	1182	DO i = nxl, nxr
	1183	DO k = nzb+1, nzt
	1184	v(k,0,i) = interpolate_in_time( nest_offl%v_south(0,k,i), &
	1185	nest_offl%v_south(1,k,i), &
	1186	fac_dt ) * &
	1187	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1188	BTEST( wall_flags_total_0(k,0,i), 2 ) )
[3347]	1189	v(k,-1,i) = v(k,0,i)
	1190	ENDDO
	1191	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,0,i)
	1192	ENDDO
	1193
	1194	DO i = nxl, nxr
	1195	DO k = nzb+1, nzt-1
	1196	w(k,-1,i) = interpolate_in_time( nest_offl%w_south(0,k,i), &
	1197	nest_offl%w_south(1,k,i), &
	1198	fac_dt ) * &
	1199	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1200	BTEST( wall_flags_total_0(k,-1,i), 3 ) )
[3347]	1201	ENDDO
[4079]	1202	w(nzt,-1,i) = w(nzt-1,-1,i)
[3347]	1203	ENDDO
	1204
	1205	DO i = nxlu, nxr
	1206	DO k = nzb+1, nzt
	1207	u(k,-1,i) = interpolate_in_time( nest_offl%u_south(0,k,i), &
	1208	nest_offl%u_south(1,k,i), &
	1209	fac_dt ) * &
	1210	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1211	BTEST( wall_flags_total_0(k,-1,i), 1 ) )
[3347]	1212	ENDDO
	1213	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,-1,i)
	1214	ENDDO
	1215
	1216	IF ( .NOT. neutral ) THEN
	1217	DO i = nxl, nxr
	1218	DO k = nzb+1, nzt
	1219	pt(k,-1,i) = interpolate_in_time( &
	1220	nest_offl%pt_south(0,k,i), &
	1221	nest_offl%pt_south(1,k,i), &
	1222	fac_dt )
	1223
	1224	ENDDO
	1225	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,-1,i)
	1226	ENDDO
	1227	ENDIF
	1228
	1229	IF ( humidity ) THEN
	1230	DO i = nxl, nxr
	1231	DO k = nzb+1, nzt
	1232	q(k,-1,i) = interpolate_in_time( &
	1233	nest_offl%q_south(0,k,i), &
	1234	nest_offl%q_south(1,k,i), &
	1235	fac_dt )
	1236
	1237	ENDDO
	1238	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,-1,i)
	1239	ENDDO
	1240	ENDIF
[4273]	1241
	1242	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	1243	DO n = 1, UBOUND( chem_species, 1 )
[4273]	1244	IF ( nest_offl%chem_from_file_s(n) ) THEN
[3737]	1245	DO i = nxl, nxr
	1246	DO k = nzb+1, nzt
	1247	chem_species(n)%conc(k,-1,i) = interpolate_in_time( &
	1248	nest_offl%chem_south(0,k,i,n),&
	1249	nest_offl%chem_south(1,k,i,n),&
	1250	fac_dt )
	1251	ENDDO
[4230]	1252	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
	1253	+ chem_species(n)%conc(nzb+1:nzt,-1,i)
[3737]	1254	ENDDO
	1255	ENDIF
	1256	ENDDO
	1257	ENDIF
[3347]	1258
	1259	ENDIF
	1260
	1261	IF ( bc_dirichlet_n ) THEN
	1262
	1263	DO i = nxl, nxr
	1264	DO k = nzb+1, nzt
	1265	v(k,nyn+1,i) = interpolate_in_time( nest_offl%v_north(0,k,i), &
	1266	nest_offl%v_north(1,k,i), &
	1267	fac_dt ) * &
	1268	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1269	BTEST( wall_flags_total_0(k,nyn+1,i), 2 ) )
[3347]	1270	ENDDO
	1271	v_ref_l(nzb+1:nzt) = v_ref_l(nzb+1:nzt) + v(nzb+1:nzt,nyn+1,i)
	1272	ENDDO
	1273	DO i = nxl, nxr
	1274	DO k = nzb+1, nzt-1
	1275	w(k,nyn+1,i) = interpolate_in_time( nest_offl%w_north(0,k,i), &
	1276	nest_offl%w_north(1,k,i), &
	1277	fac_dt ) * &
	1278	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1279	BTEST( wall_flags_total_0(k,nyn+1,i), 3 ) )
[3347]	1280	ENDDO
[4079]	1281	w(nzt,nyn+1,i) = w(nzt-1,nyn+1,i)
[3347]	1282	ENDDO
	1283
	1284	DO i = nxlu, nxr
	1285	DO k = nzb+1, nzt
	1286	u(k,nyn+1,i) = interpolate_in_time( nest_offl%u_north(0,k,i), &
	1287	nest_offl%u_north(1,k,i), &
	1288	fac_dt ) * &
	1289	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1290	BTEST( wall_flags_total_0(k,nyn+1,i), 1 ) )
[3347]	1291
	1292	ENDDO
	1293	u_ref_l(nzb+1:nzt) = u_ref_l(nzb+1:nzt) + u(nzb+1:nzt,nyn+1,i)
	1294	ENDDO
	1295
	1296	IF ( .NOT. neutral ) THEN
	1297	DO i = nxl, nxr
	1298	DO k = nzb+1, nzt
	1299	pt(k,nyn+1,i) = interpolate_in_time( &
	1300	nest_offl%pt_north(0,k,i), &
	1301	nest_offl%pt_north(1,k,i), &
	1302	fac_dt )
	1303
	1304	ENDDO
	1305	pt_ref_l(nzb+1:nzt) = pt_ref_l(nzb+1:nzt) + pt(nzb+1:nzt,nyn+1,i)
	1306	ENDDO
	1307	ENDIF
	1308
	1309	IF ( humidity ) THEN
	1310	DO i = nxl, nxr
	1311	DO k = nzb+1, nzt
	1312	q(k,nyn+1,i) = interpolate_in_time( &
	1313	nest_offl%q_north(0,k,i), &
	1314	nest_offl%q_north(1,k,i), &
	1315	fac_dt )
	1316
	1317	ENDDO
	1318	q_ref_l(nzb+1:nzt) = q_ref_l(nzb+1:nzt) + q(nzb+1:nzt,nyn+1,i)
	1319	ENDDO
	1320	ENDIF
[4273]	1321
	1322	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	1323	DO n = 1, UBOUND( chem_species, 1 )
[4273]	1324	IF ( nest_offl%chem_from_file_n(n) ) THEN
[3737]	1325	DO i = nxl, nxr
	1326	DO k = nzb+1, nzt
	1327	chem_species(n)%conc(k,nyn+1,i) = interpolate_in_time(&
	1328	nest_offl%chem_north(0,k,i,n),&
	1329	nest_offl%chem_north(1,k,i,n),&
	1330	fac_dt )
	1331	ENDDO
[4230]	1332	ref_chem_l(nzb+1:nzt,n) = ref_chem_l(nzb+1:nzt,n) &
	1333	+ chem_species(n)%conc(nzb+1:nzt,nyn+1,i)
[3737]	1334	ENDDO
	1335	ENDIF
	1336	ENDDO
	1337	ENDIF
[3347]	1338
	1339	ENDIF
	1340	!
	1341	!-- Top boundary
	1342	DO i = nxlu, nxr
	1343	DO j = nys, nyn
	1344	u(nzt+1,j,i) = interpolate_in_time( nest_offl%u_top(0,j,i), &
	1345	nest_offl%u_top(1,j,i), &
	1346	fac_dt ) * &
	1347	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1348	BTEST( wall_flags_total_0(nzt+1,j,i), 1 ) )
[3347]	1349	u_ref_l(nzt+1) = u_ref_l(nzt+1) + u(nzt+1,j,i)
	1350	ENDDO
	1351	ENDDO
[3937]	1352	!
	1353	!-- For left boundary set boundary condition for u-component also at top
	1354	!-- grid point.
	1355	!-- Note, this has no effect on the numeric solution, only for data output.
	1356	IF ( bc_dirichlet_l ) u(nzt+1,:,nxl) = u(nzt+1,:,nxlu)
[3347]	1357
	1358	DO i = nxl, nxr
	1359	DO j = nysv, nyn
	1360	v(nzt+1,j,i) = interpolate_in_time( nest_offl%v_top(0,j,i), &
	1361	nest_offl%v_top(1,j,i), &
	1362	fac_dt ) * &
	1363	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1364	BTEST( wall_flags_total_0(nzt+1,j,i), 2 ) )
[3347]	1365	v_ref_l(nzt+1) = v_ref_l(nzt+1) + v(nzt+1,j,i)
	1366	ENDDO
	1367	ENDDO
[3937]	1368	!
	1369	!-- For south boundary set boundary condition for v-component also at top
	1370	!-- grid point.
	1371	!-- Note, this has no effect on the numeric solution, only for data output.
	1372	IF ( bc_dirichlet_s ) v(nzt+1,nys,:) = v(nzt+1,nysv,:)
[3347]	1373
	1374	DO i = nxl, nxr
	1375	DO j = nys, nyn
	1376	w(nzt,j,i) = interpolate_in_time( nest_offl%w_top(0,j,i), &
	1377	nest_offl%w_top(1,j,i), &
	1378	fac_dt ) * &
	1379	MERGE( 1.0_wp, 0.0_wp, &
[4346]	1380	BTEST( wall_flags_total_0(nzt,j,i), 3 ) )
[3347]	1381	w(nzt+1,j,i) = w(nzt,j,i)
	1382	ENDDO
	1383	ENDDO
	1384
	1385
	1386	IF ( .NOT. neutral ) THEN
	1387	DO i = nxl, nxr
	1388	DO j = nys, nyn
	1389	pt(nzt+1,j,i) = interpolate_in_time( nest_offl%pt_top(0,j,i), &
	1390	nest_offl%pt_top(1,j,i), &
	1391	fac_dt )
	1392	pt_ref_l(nzt+1) = pt_ref_l(nzt+1) + pt(nzt+1,j,i)
	1393	ENDDO
	1394	ENDDO
	1395	ENDIF
	1396
	1397	IF ( humidity ) THEN
	1398	DO i = nxl, nxr
	1399	DO j = nys, nyn
	1400	q(nzt+1,j,i) = interpolate_in_time( nest_offl%q_top(0,j,i), &
	1401	nest_offl%q_top(1,j,i), &
	1402	fac_dt )
	1403	q_ref_l(nzt+1) = q_ref_l(nzt+1) + q(nzt+1,j,i)
	1404	ENDDO
	1405	ENDDO
	1406	ENDIF
[4273]	1407
	1408	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	1409	DO n = 1, UBOUND( chem_species, 1 )
[4273]	1410	IF ( nest_offl%chem_from_file_t(n) ) THEN
[3737]	1411	DO i = nxl, nxr
	1412	DO j = nys, nyn
	1413	chem_species(n)%conc(nzt+1,j,i) = interpolate_in_time( &
[4230]	1414	nest_offl%chem_top(0,j,i,n), &
	1415	nest_offl%chem_top(1,j,i,n), &
[3737]	1416	fac_dt )
[4230]	1417	ref_chem_l(nzt+1,n) = ref_chem_l(nzt+1,n) + &
	1418	chem_species(n)%conc(nzt+1,j,i)
[3737]	1419	ENDDO
	1420	ENDDO
	1421	ENDIF
	1422	ENDDO
	1423	ENDIF
[3347]	1424	!
	1425	!-- Moreover, set Neumann boundary condition for subgrid-scale TKE,
	1426	!-- passive scalar, dissipation, and chemical species if required
	1427	IF ( rans_mode .AND. rans_tke_e ) THEN
	1428	IF ( bc_dirichlet_l ) diss(:,:,nxl-1) = diss(:,:,nxl)
	1429	IF ( bc_dirichlet_r ) diss(:,:,nxr+1) = diss(:,:,nxr)
	1430	IF ( bc_dirichlet_s ) diss(:,nys-1,:) = diss(:,nys,:)
	1431	IF ( bc_dirichlet_n ) diss(:,nyn+1,:) = diss(:,nyn,:)
	1432	ENDIF
[4079]	1433	! IF ( .NOT. constant_diffusion ) THEN
	1434	! IF ( bc_dirichlet_l ) e(:,:,nxl-1) = e(:,:,nxl)
	1435	! IF ( bc_dirichlet_r ) e(:,:,nxr+1) = e(:,:,nxr)
	1436	! IF ( bc_dirichlet_s ) e(:,nys-1,:) = e(:,nys,:)
	1437	! IF ( bc_dirichlet_n ) e(:,nyn+1,:) = e(:,nyn,:)
	1438	! e(nzt+1,:,:) = e(nzt,:,:)
	1439	! ENDIF
	1440	! IF ( passive_scalar ) THEN
	1441	! IF ( bc_dirichlet_l ) s(:,:,nxl-1) = s(:,:,nxl)
	1442	! IF ( bc_dirichlet_r ) s(:,:,nxr+1) = s(:,:,nxr)
	1443	! IF ( bc_dirichlet_s ) s(:,nys-1,:) = s(:,nys,:)
	1444	! IF ( bc_dirichlet_n ) s(:,nyn+1,:) = s(:,nyn,:)
	1445	! ENDIF
[3347]	1446
	1447	CALL exchange_horiz( u, nbgp )
	1448	CALL exchange_horiz( v, nbgp )
	1449	CALL exchange_horiz( w, nbgp )
	1450	IF ( .NOT. neutral ) CALL exchange_horiz( pt, nbgp )
	1451	IF ( humidity ) CALL exchange_horiz( q, nbgp )
[4273]	1452	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	1453	DO n = 1, UBOUND( chem_species, 1 )
[3858]	1454	!
	1455	!-- Do local exchange only when necessary, i.e. when data is coming
	1456	!-- from dynamic file.
	1457	IF ( nest_offl%chem_from_file_t(n) ) &
	1458	CALL exchange_horiz( chem_species(n)%conc, nbgp )
[3737]	1459	ENDDO
	1460	ENDIF
[3347]	1461	!
[4079]	1462	!-- Set top boundary condition at all horizontal grid points, also at the
	1463	!-- lateral boundary grid points.
	1464	w(nzt+1,:,:) = w(nzt,:,:)
	1465	!
[4270]	1466	!-- Offline nesting for salsa
	1467	IF ( salsa ) CALL salsa_nesting_offl_bc
	1468	!
[3347]	1469	!-- In case of Rayleigh damping, where the profiles u_init, v_init
	1470	!-- q_init and pt_init are still used, update these profiles from the
	1471	!-- averaged boundary data.
	1472	!-- But first, average these data.
	1473	#if defined( __parallel )
	1474	CALL MPI_ALLREDUCE( u_ref_l, u_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, &
	1475	comm2d, ierr )
	1476	CALL MPI_ALLREDUCE( v_ref_l, v_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, &
	1477	comm2d, ierr )
	1478	IF ( humidity ) THEN
	1479	CALL MPI_ALLREDUCE( q_ref_l, q_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM, &
	1480	comm2d, ierr )
	1481	ENDIF
	1482	IF ( .NOT. neutral ) THEN
	1483	CALL MPI_ALLREDUCE( pt_ref_l, pt_ref, nzt+1-nzb+1, MPI_REAL, MPI_SUM,&
	1484	comm2d, ierr )
	1485	ENDIF
[4273]	1486	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[4230]	1487	CALL MPI_ALLREDUCE( ref_chem_l, ref_chem, &
	1488	( nzt+1-nzb+1 ) * SIZE( ref_chem(nzb,:) ), &
	1489	MPI_REAL, MPI_SUM, comm2d, ierr )
	1490	ENDIF
[3347]	1491	#else
[3704]	1492	u_ref = u_ref_l
	1493	v_ref = v_ref_l
[4230]	1494	IF ( humidity ) q_ref = q_ref_l
	1495	IF ( .NOT. neutral ) pt_ref = pt_ref_l
[4273]	1496	IF ( air_chemistry .AND. nesting_offline_chem ) ref_chem = ref_chem_l
[3347]	1497	#endif
	1498	!
[3704]	1499	!-- Average data. Note, reference profiles up to nzt are derived from lateral
	1500	!-- boundaries, at the model top it is derived from the top boundary. Thus,
	1501	!-- number of input data is different from nzb:nzt compared to nzt+1.
	1502	!-- Derived from lateral boundaries.
	1503	u_ref(nzb:nzt) = u_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + 1 + nx ), &
	1504	KIND = wp )
	1505	v_ref(nzb:nzt) = v_ref(nzb:nzt) / REAL( 2.0_wp * ( ny + nx + 1 ), &
	1506	KIND = wp )
	1507	IF ( humidity ) &
	1508	q_ref(nzb:nzt) = q_ref(nzb:nzt) / REAL( 2.0_wp * &
	1509	( ny + 1 + nx + 1 ), &
	1510	KIND = wp )
	1511	IF ( .NOT. neutral ) &
	1512	pt_ref(nzb:nzt) = pt_ref(nzb:nzt) / REAL( 2.0_wp * &
	1513	( ny + 1 + nx + 1 ), &
	1514	KIND = wp )
[4273]	1515	IF ( air_chemistry .AND. nesting_offline_chem ) &
[4230]	1516	ref_chem(nzb:nzt,:) = ref_chem(nzb:nzt,:) / REAL( 2.0_wp * &
	1517	( ny + 1 + nx + 1 ), &
	1518	KIND = wp )
[3347]	1519	!
[3704]	1520	!-- Derived from top boundary.
	1521	u_ref(nzt+1) = u_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx ), KIND = wp )
	1522	v_ref(nzt+1) = v_ref(nzt+1) / REAL( ( ny ) * ( nx + 1 ), KIND = wp )
	1523	IF ( humidity ) &
	1524	q_ref(nzt+1) = q_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), &
	1525	KIND = wp )
	1526	IF ( .NOT. neutral ) &
	1527	pt_ref(nzt+1) = pt_ref(nzt+1) / REAL( ( ny + 1 ) * ( nx + 1 ), &
	1528	KIND = wp )
[4273]	1529	IF ( air_chemistry .AND. nesting_offline_chem ) &
[4230]	1530	ref_chem(nzt+1,:) = ref_chem(nzt+1,:) / &
	1531	REAL( ( ny + 1 ) * ( nx + 1 ),KIND = wp )
[3347]	1532	!
[4230]	1533	!-- Write onto init profiles, which are used for damping. Also set lower
	1534	!-- boundary condition for scalars (not required for u and v as these are
	1535	!-- zero at k=nzb.
[3704]	1536	u_init = u_ref
	1537	v_init = v_ref
[4230]	1538	IF ( humidity ) THEN
	1539	q_init = q_ref
	1540	q_init(nzb) = q_init(nzb+1)
	1541	ENDIF
	1542	IF ( .NOT. neutral ) THEN
	1543	pt_init = pt_ref
	1544	pt_init(nzb) = pt_init(nzb+1)
	1545	ENDIF
	1546
[4273]	1547	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[4230]	1548	DO n = 1, UBOUND( chem_species, 1 )
	1549	IF ( nest_offl%chem_from_file_t(n) ) THEN
	1550	chem_species(n)%conc_pr_init(:) = ref_chem(:,n)
	1551	chem_species(n)%conc_pr_init(nzb) = &
	1552	chem_species(n)%conc_pr_init(nzb+1)
	1553	ENDIF
	1554	ENDDO
	1555	ENDIF
	1556
[4231]	1557	IF ( ALLOCATED( ref_chem ) ) DEALLOCATE( ref_chem )
[4273]	1558	IF ( ALLOCATED( ref_chem_l ) ) DEALLOCATE( ref_chem_l )
[3347]	1559	!
[3704]	1560	!-- Further, adjust Rayleigh damping height in case of time-changing conditions.
	1561	!-- Therefore, calculate boundary-layer depth first.
[4022]	1562	CALL nesting_offl_calc_zi
[3704]	1563	CALL adjust_sponge_layer
[4273]	1564
[4226]	1565	CALL cpu_log( log_point(58), 'offline nesting', 'stop' )
	1566
	1567	IF ( debug_output_timestep ) CALL debug_message( 'nesting_offl_bc', 'end' )
	1568
	1569
	1570	END SUBROUTINE nesting_offl_bc
	1571
	1572	!------------------------------------------------------------------------------!
	1573	! Description:
	1574	!------------------------------------------------------------------------------!
[4581]	1575	!> Update of the geostrophic wind components. Note, currently this routine is
	1576	!> not invoked.
[4226]	1577	!------------------------------------------------------------------------------!
	1578	SUBROUTINE nesting_offl_geostrophic_wind
	1579
	1580	INTEGER(iwp) :: k
[3347]	1581	!
[3704]	1582	!-- Update geostrophic wind components from dynamic input file.
	1583	DO k = nzb+1, nzt
	1584	ug(k) = interpolate_in_time( nest_offl%ug(0,k), nest_offl%ug(1,k), &
	1585	fac_dt )
	1586	vg(k) = interpolate_in_time( nest_offl%vg(0,k), nest_offl%vg(1,k), &
	1587	fac_dt )
	1588	ENDDO
	1589	ug(nzt+1) = ug(nzt)
	1590	vg(nzt+1) = vg(nzt)
[3347]	1591
[4226]	1592	END SUBROUTINE nesting_offl_geostrophic_wind
[3987]	1593
[4226]	1594	!------------------------------------------------------------------------------!
	1595	! Description:
	1596	!------------------------------------------------------------------------------!
	1597	!> Determine the interpolation constant for time interpolation. The
	1598	!> calculation is separated from the nesting_offl_bc and
	1599	!> nesting_offl_geostrophic_wind in order to be independent on the order
	1600	!> of calls.
	1601	!------------------------------------------------------------------------------!
	1602	SUBROUTINE nesting_offl_interpolation_factor
	1603	!
	1604	!-- Determine interpolation factor and limit it to 1. This is because
	1605	!-- t+dt can slightly exceed time(tind_p) before boundary data is updated
	1606	!-- again.
[4358]	1607	fac_dt = ( time_since_reference_point &
[4226]	1608	- nest_offl%time(nest_offl%tind) + dt_3d ) / &
	1609	( nest_offl%time(nest_offl%tind_p) - nest_offl%time(nest_offl%tind) )
[3987]	1610
[4226]	1611	fac_dt = MIN( 1.0_wp, fac_dt )
[3347]	1612
[4226]	1613	END SUBROUTINE nesting_offl_interpolation_factor
	1614
[3347]	1615	!------------------------------------------------------------------------------!
	1616	! Description:
	1617	!------------------------------------------------------------------------------!
	1618	!> Calculates the boundary-layer depth from the boundary data, according to
	1619	!> bulk-Richardson criterion.
	1620	!------------------------------------------------------------------------------!
[4022]	1621	SUBROUTINE nesting_offl_calc_zi
[3347]	1622
[4022]	1623	INTEGER(iwp) :: i !< loop index in x-direction
	1624	INTEGER(iwp) :: j !< loop index in y-direction
	1625	INTEGER(iwp) :: k !< loop index in z-direction
	1626	INTEGER(iwp) :: k_max_loc !< index of maximum wind speed along z-direction
	1627	INTEGER(iwp) :: k_surface !< topography top index in z-direction
	1628	INTEGER(iwp) :: num_boundary_gp_non_cyclic !< number of non-cyclic boundaries, used for averaging ABL depth
	1629	INTEGER(iwp) :: num_boundary_gp_non_cyclic_l !< number of non-cyclic boundaries, used for averaging ABL depth
[3347]	1630
	1631	REAL(wp) :: ri_bulk !< bulk Richardson number
	1632	REAL(wp) :: ri_bulk_crit = 0.25_wp !< critical bulk Richardson number
	1633	REAL(wp) :: topo_max !< maximum topography level in model domain
	1634	REAL(wp) :: topo_max_l !< maximum topography level in subdomain
	1635	REAL(wp) :: vpt_surface !< near-surface virtual potential temperature
	1636	REAL(wp) :: zi_l !< mean boundary-layer depth on subdomain
	1637	REAL(wp) :: zi_local !< local boundary-layer depth
	1638
	1639	REAL(wp), DIMENSION(nzb:nzt+1) :: vpt_col !< vertical profile of virtual potential temperature at (j,i)-grid point
[4022]	1640	REAL(wp), DIMENSION(nzb:nzt+1) :: uv_abs !< vertical profile of horizontal wind speed at (j,i)-grid point
[3347]	1641
	1642
	1643	!
	1644	!-- Calculate mean boundary-layer height from boundary data.
	1645	!-- Start with the left and right boundaries.
	1646	zi_l = 0.0_wp
[4022]	1647	num_boundary_gp_non_cyclic_l = 0
[3347]	1648	IF ( bc_dirichlet_l .OR. bc_dirichlet_r ) THEN
	1649	!
[4022]	1650	!-- Sum-up and store number of boundary grid points used for averaging
	1651	!-- ABL depth
	1652	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + &
	1653	nxr - nxl + 1
	1654	!
[3347]	1655	!-- Determine index along x. Please note, index indicates boundary
	1656	!-- grid point for scalars.
	1657	i = MERGE( -1, nxr + 1, bc_dirichlet_l )
	1658
	1659	DO j = nys, nyn
	1660	!
	1661	!-- Determine topography top index at current (j,i) index
[4168]	1662	k_surface = topo_top_ind(j,i,0)
[3347]	1663	!
	1664	!-- Pre-compute surface virtual temperature. Therefore, use 2nd
	1665	!-- prognostic level according to Heinze et al. (2017).
	1666	IF ( humidity ) THEN
	1667	vpt_surface = pt(k_surface+2,j,i) * &
	1668	( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
	1669	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
	1670	ELSE
	1671	vpt_surface = pt(k_surface+2,j,i)
	1672	vpt_col = pt(:,j,i)
	1673	ENDIF
	1674	!
	1675	!-- Calculate local boundary layer height from bulk Richardson number,
	1676	!-- i.e. the height where the bulk Richardson number exceeds its
	1677	!-- critical value of 0.25 (according to Heinze et al., 2017).
	1678	!-- Note, no interpolation of u- and v-component is made, as both
	1679	!-- are mainly mean inflow profiles with very small spatial variation.
[3964]	1680	!-- Add a safety factor in case the velocity term becomes zero. This
	1681	!-- may happen if overhanging 3D structures are directly located at
	1682	!-- the boundary, where velocity inside the building is zero
	1683	!-- (k_surface is the index of the lowest upward-facing surface).
[4022]	1684	uv_abs(:) = SQRT( MERGE( u(:,j,i+1), u(:,j,i), &
	1685	bc_dirichlet_l )**2 + &
	1686	v(:,j,i)**2 )
	1687	!
	1688	!-- Determine index of the maximum wind speed
	1689	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
	1690
[3347]	1691	zi_local = 0.0_wp
	1692	DO k = k_surface+1, nzt
	1693	ri_bulk = zu(k) * g / vpt_surface * &
	1694	( vpt_col(k) - vpt_surface ) / &
[4022]	1695	( uv_abs(k) + 1E-5_wp )
	1696	!
	1697	!-- Check if critical Richardson number is exceeded. Further, check
	1698	!-- if there is a maxium in the wind profile in order to detect also
	1699	!-- ABL heights in the stable boundary layer.
	1700	IF ( zi_local == 0.0_wp .AND. &
	1701	( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
[3347]	1702	zi_local = zu(k)
	1703	ENDDO
	1704	!
	1705	!-- Assure that the minimum local boundary-layer depth is at least at
	1706	!-- the second vertical grid level.
	1707	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
	1708
	1709	ENDDO
	1710
	1711	ENDIF
	1712	!
	1713	!-- Do the same at the north and south boundaries.
	1714	IF ( bc_dirichlet_s .OR. bc_dirichlet_n ) THEN
	1715
[4022]	1716	num_boundary_gp_non_cyclic_l = num_boundary_gp_non_cyclic_l + &
	1717	nxr - nxl + 1
	1718
[3347]	1719	j = MERGE( -1, nyn + 1, bc_dirichlet_s )
	1720
	1721	DO i = nxl, nxr
[4168]	1722	k_surface = topo_top_ind(j,i,0)
[3347]	1723
	1724	IF ( humidity ) THEN
	1725	vpt_surface = pt(k_surface+2,j,i) * &
	1726	( 1.0_wp + 0.61_wp * q(k_surface+2,j,i) )
	1727	vpt_col = pt(:,j,i) * ( 1.0_wp + 0.61_wp * q(:,j,i) )
	1728	ELSE
	1729	vpt_surface = pt(k_surface+2,j,i)
	1730	vpt_col = pt(:,j,i)
	1731	ENDIF
	1732
[4022]	1733	uv_abs(:) = SQRT( u(:,j,i)**2 + &
	1734	MERGE( v(:,j+1,i), v(:,j,i), &
	1735	bc_dirichlet_s )**2 )
	1736	!
	1737	!-- Determine index of the maximum wind speed
	1738	k_max_loc = MAXLOC( uv_abs(:), DIM = 1 ) - 1
	1739
[3347]	1740	zi_local = 0.0_wp
	1741	DO k = k_surface+1, nzt
	1742	ri_bulk = zu(k) * g / vpt_surface * &
	1743	( vpt_col(k) - vpt_surface ) / &
[4022]	1744	( uv_abs(k) + 1E-5_wp )
	1745	!
	1746	!-- Check if critical Richardson number is exceeded. Further, check
	1747	!-- if there is a maxium in the wind profile in order to detect also
	1748	!-- ABL heights in the stable boundary layer.
	1749	IF ( zi_local == 0.0_wp .AND. &
	1750	( ri_bulk > ri_bulk_crit .OR. k == k_max_loc ) ) &
[3347]	1751	zi_local = zu(k)
	1752	ENDDO
	1753	zi_l = zi_l + MAX( zi_local, zu(k_surface+2) )
	1754
	1755	ENDDO
	1756
	1757	ENDIF
	1758
	1759	#if defined( __parallel )
	1760	CALL MPI_ALLREDUCE( zi_l, zi_ribulk, 1, MPI_REAL, MPI_SUM, &
	1761	comm2d, ierr )
[4022]	1762	CALL MPI_ALLREDUCE( num_boundary_gp_non_cyclic_l, &
	1763	num_boundary_gp_non_cyclic, &
	1764	1, MPI_INTEGER, MPI_SUM, comm2d, ierr )
[3347]	1765	#else
	1766	zi_ribulk = zi_l
[4022]	1767	num_boundary_gp_non_cyclic = num_boundary_gp_non_cyclic_l
[3347]	1768	#endif
[4022]	1769	zi_ribulk = zi_ribulk / REAL( num_boundary_gp_non_cyclic, KIND = wp )
[3347]	1770	!
	1771	!-- Finally, check if boundary layer depth is not below the any topography.
	1772	!-- zi_ribulk will be used to adjust rayleigh damping height, i.e. the
	1773	!-- lower level of the sponge layer, as well as to adjust the synthetic
	1774	!-- turbulence generator accordingly. If Rayleigh damping would be applied
	1775	!-- near buildings, etc., this would spoil the simulation results.
[4168]	1776	topo_max_l = zw(MAXVAL( topo_top_ind(nys:nyn,nxl:nxr,0) ))
[3347]	1777
	1778	#if defined( __parallel )
[4022]	1779	CALL MPI_ALLREDUCE( topo_max_l, topo_max, 1, MPI_REAL, MPI_MAX, &
[3347]	1780	comm2d, ierr )
	1781	#else
	1782	topo_max = topo_max_l
	1783	#endif
[4022]	1784	! zi_ribulk = MAX( zi_ribulk, topo_max )
[3937]	1785
[4022]	1786	END SUBROUTINE nesting_offl_calc_zi
[3347]	1787
	1788
	1789	!------------------------------------------------------------------------------!
	1790	! Description:
	1791	!------------------------------------------------------------------------------!
	1792	!> Adjust the height where the rayleigh damping starts, i.e. the lower level
	1793	!> of the sponge layer.
	1794	!------------------------------------------------------------------------------!
	1795	SUBROUTINE adjust_sponge_layer
	1796
	1797	INTEGER(iwp) :: k !< loop index in z-direction
	1798
	1799	REAL(wp) :: rdh !< updated Rayleigh damping height
	1800
	1801
	1802	IF ( rayleigh_damping_height > 0.0_wp .AND. &
	1803	rayleigh_damping_factor > 0.0_wp ) THEN
	1804	!
	1805	!-- Update Rayleigh-damping height and re-calculate height-depending
	1806	!-- damping coefficients.
	1807	!-- Assure that rayleigh damping starts well above the boundary layer.
	1808	rdh = MIN( MAX( zi_ribulk * 1.3_wp, 10.0_wp * dz(1) ), &
	1809	0.8_wp * zu(nzt), rayleigh_damping_height )
	1810	!
	1811	!-- Update Rayleigh damping factor
	1812	DO k = nzb+1, nzt
	1813	IF ( zu(k) >= rdh ) THEN
	1814	rdf(k) = rayleigh_damping_factor * &
	1815	( SIN( pi * 0.5_wp * ( zu(k) - rdh ) &
	1816	/ ( zu(nzt) - rdh ) ) &
	1817	)**2
	1818	ENDIF
	1819	ENDDO
	1820	rdf_sc = rdf
	1821
	1822	ENDIF
	1823
	1824	END SUBROUTINE adjust_sponge_layer
	1825
	1826	!------------------------------------------------------------------------------!
	1827	! Description:
	1828	! ------------
	1829	!> Performs consistency checks
	1830	!------------------------------------------------------------------------------!
	1831	SUBROUTINE nesting_offl_check_parameters
	1832	!
[4169]	1833	!-- Check if offline nesting is applied in nested child domain.
[3579]	1834	IF ( nesting_offline .AND. child_domain ) THEN
	1835	message_string = 'Offline nesting is only applicable in root model.'
[4169]	1836	CALL message( 'offline_nesting_check_parameters', 'PA0622', 1, 2, 0, 6, 0 )
[4226]	1837	ENDIF
[3347]	1838
	1839	END SUBROUTINE nesting_offl_check_parameters
	1840
	1841	!------------------------------------------------------------------------------!
	1842	! Description:
	1843	! ------------
	1844	!> Reads the parameter list nesting_offl_parameters
	1845	!------------------------------------------------------------------------------!
	1846	SUBROUTINE nesting_offl_parin
	1847
	1848	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
	1849
	1850
	1851	NAMELIST /nesting_offl_parameters/ nesting_offline
	1852
	1853	line = ' '
	1854
	1855	!
	1856	!-- Try to find stg package
	1857	REWIND ( 11 )
	1858	line = ' '
	1859	DO WHILE ( INDEX( line, '&nesting_offl_parameters' ) == 0 )
	1860	READ ( 11, '(A)', END=20 ) line
	1861	ENDDO
	1862	BACKSPACE ( 11 )
	1863
	1864	!
	1865	!-- Read namelist
	1866	READ ( 11, nesting_offl_parameters, ERR = 10, END = 20 )
	1867
	1868	GOTO 20
	1869
	1870	10 BACKSPACE( 11 )
	1871	READ( 11 , '(A)') line
	1872	CALL parin_fail_message( 'nesting_offl_parameters', line )
	1873
	1874	20 CONTINUE
	1875
	1876
	1877	END SUBROUTINE nesting_offl_parin
	1878
	1879	!------------------------------------------------------------------------------!
	1880	! Description:
	1881	! ------------
	1882	!> Writes information about offline nesting into HEADER file
	1883	!------------------------------------------------------------------------------!
	1884	SUBROUTINE nesting_offl_header ( io )
	1885
	1886	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
	1887
	1888	WRITE ( io, 1 )
	1889	IF ( nesting_offline ) THEN
	1890	WRITE ( io, 3 )
	1891	ELSE
	1892	WRITE ( io, 2 )
	1893	ENDIF
	1894
	1895	1 FORMAT (//' Offline nesting in COSMO model:'/ &
	1896	' -------------------------------'/)
	1897	2 FORMAT (' --> No offlince nesting is used (default) ')
	1898	3 FORMAT (' --> Offlince nesting is used. Boundary data is read from dynamic input file ')
	1899
	1900	END SUBROUTINE nesting_offl_header
	1901
	1902	!------------------------------------------------------------------------------!
	1903	! Description:
	1904	! ------------
	1905	!> Allocate arrays used to read boundary data from NetCDF file and initialize
	1906	!> boundary data.
	1907	!------------------------------------------------------------------------------!
	1908	SUBROUTINE nesting_offl_init
[4226]	1909
[3737]	1910	INTEGER(iwp) :: n !< running index for chemical species
[3347]	1911
	1912	!-- Allocate arrays for geostrophic wind components. Arrays will
[3404]	1913	!-- incorporate 2 time levels in order to interpolate in between.
	1914	ALLOCATE( nest_offl%ug(0:1,1:nzt) )
	1915	ALLOCATE( nest_offl%vg(0:1,1:nzt) )
[3347]	1916	!
[4125]	1917	!-- Allocate arrays for reading left/right boundary values. Arrays will
	1918	!-- incorporate 2 time levels in order to interpolate in between. If the core has
	1919	!-- no boundary, allocate a dummy array, in order to enable netcdf parallel
	1920	!-- access. Dummy arrays will be allocated with dimension length zero.
[3347]	1921	IF ( bc_dirichlet_l ) THEN
	1922	ALLOCATE( nest_offl%u_left(0:1,nzb+1:nzt,nys:nyn) )
	1923	ALLOCATE( nest_offl%v_left(0:1,nzb+1:nzt,nysv:nyn) )
	1924	ALLOCATE( nest_offl%w_left(0:1,nzb+1:nzt-1,nys:nyn) )
	1925	IF ( humidity ) ALLOCATE( nest_offl%q_left(0:1,nzb+1:nzt,nys:nyn) )
	1926	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_left(0:1,nzb+1:nzt,nys:nyn) )
[4273]	1927	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1928	ALLOCATE( nest_offl%chem_left(0:1,nzb+1:nzt,nys:nyn,1:UBOUND( chem_species, 1 )) )
[4125]	1929	ELSE
	1930	ALLOCATE( nest_offl%u_left(1:1,1:1,1:1) )
	1931	ALLOCATE( nest_offl%v_left(1:1,1:1,1:1) )
	1932	ALLOCATE( nest_offl%w_left(1:1,1:1,1:1) )
	1933	IF ( humidity ) ALLOCATE( nest_offl%q_left(1:1,1:1,1:1) )
	1934	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_left(1:1,1:1,1:1) )
[4273]	1935	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1936	ALLOCATE( nest_offl%chem_left(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
[3347]	1937	ENDIF
	1938	IF ( bc_dirichlet_r ) THEN
	1939	ALLOCATE( nest_offl%u_right(0:1,nzb+1:nzt,nys:nyn) )
	1940	ALLOCATE( nest_offl%v_right(0:1,nzb+1:nzt,nysv:nyn) )
	1941	ALLOCATE( nest_offl%w_right(0:1,nzb+1:nzt-1,nys:nyn) )
	1942	IF ( humidity ) ALLOCATE( nest_offl%q_right(0:1,nzb+1:nzt,nys:nyn) )
	1943	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_right(0:1,nzb+1:nzt,nys:nyn) )
[4273]	1944	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1945	ALLOCATE( nest_offl%chem_right(0:1,nzb+1:nzt,nys:nyn,1:UBOUND( chem_species, 1 )) )
[4125]	1946	ELSE
	1947	ALLOCATE( nest_offl%u_right(1:1,1:1,1:1) )
	1948	ALLOCATE( nest_offl%v_right(1:1,1:1,1:1) )
	1949	ALLOCATE( nest_offl%w_right(1:1,1:1,1:1) )
	1950	IF ( humidity ) ALLOCATE( nest_offl%q_right(1:1,1:1,1:1) )
	1951	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_right(1:1,1:1,1:1) )
[4273]	1952	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1953	ALLOCATE( nest_offl%chem_right(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
[3347]	1954	ENDIF
[4125]	1955	!
	1956	!-- Allocate arrays for reading north/south boundary values. Arrays will
	1957	!-- incorporate 2 time levels in order to interpolate in between. If the core has
	1958	!-- no boundary, allocate a dummy array, in order to enable netcdf parallel
	1959	!-- access. Dummy arrays will be allocated with dimension length zero.
[3347]	1960	IF ( bc_dirichlet_n ) THEN
	1961	ALLOCATE( nest_offl%u_north(0:1,nzb+1:nzt,nxlu:nxr) )
	1962	ALLOCATE( nest_offl%v_north(0:1,nzb+1:nzt,nxl:nxr) )
	1963	ALLOCATE( nest_offl%w_north(0:1,nzb+1:nzt-1,nxl:nxr) )
	1964	IF ( humidity ) ALLOCATE( nest_offl%q_north(0:1,nzb+1:nzt,nxl:nxr) )
	1965	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_north(0:1,nzb+1:nzt,nxl:nxr) )
[4273]	1966	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1967	ALLOCATE( nest_offl%chem_north(0:1,nzb+1:nzt,nxl:nxr,1:UBOUND( chem_species, 1 )) )
[4125]	1968	ELSE
	1969	ALLOCATE( nest_offl%u_north(1:1,1:1,1:1) )
	1970	ALLOCATE( nest_offl%v_north(1:1,1:1,1:1) )
	1971	ALLOCATE( nest_offl%w_north(1:1,1:1,1:1) )
	1972	IF ( humidity ) ALLOCATE( nest_offl%q_north(1:1,1:1,1:1) )
	1973	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_north(1:1,1:1,1:1) )
[4273]	1974	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1975	ALLOCATE( nest_offl%chem_north(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
[3347]	1976	ENDIF
	1977	IF ( bc_dirichlet_s ) THEN
	1978	ALLOCATE( nest_offl%u_south(0:1,nzb+1:nzt,nxlu:nxr) )
	1979	ALLOCATE( nest_offl%v_south(0:1,nzb+1:nzt,nxl:nxr) )
	1980	ALLOCATE( nest_offl%w_south(0:1,nzb+1:nzt-1,nxl:nxr) )
	1981	IF ( humidity ) ALLOCATE( nest_offl%q_south(0:1,nzb+1:nzt,nxl:nxr) )
	1982	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_south(0:1,nzb+1:nzt,nxl:nxr) )
[4273]	1983	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1984	ALLOCATE( nest_offl%chem_south(0:1,nzb+1:nzt,nxl:nxr,1:UBOUND( chem_species, 1 )) )
[4125]	1985	ELSE
	1986	ALLOCATE( nest_offl%u_south(1:1,1:1,1:1) )
	1987	ALLOCATE( nest_offl%v_south(1:1,1:1,1:1) )
	1988	ALLOCATE( nest_offl%w_south(1:1,1:1,1:1) )
	1989	IF ( humidity ) ALLOCATE( nest_offl%q_south(1:1,1:1,1:1) )
	1990	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_south(1:1,1:1,1:1) )
[4273]	1991	IF ( air_chemistry .AND. nesting_offline_chem ) &
	1992	ALLOCATE( nest_offl%chem_south(1:1,1:1,1:1,1:UBOUND( chem_species, 1 )) )
[3347]	1993	ENDIF
[4125]	1994	!
	1995	!-- Allocate arrays for reading data at the top boundary. In contrast to the
	1996	!-- lateral boundaries, every core reads these data so that no dummy
	1997	!-- arrays need to be allocated.
[3347]	1998	ALLOCATE( nest_offl%u_top(0:1,nys:nyn,nxlu:nxr) )
	1999	ALLOCATE( nest_offl%v_top(0:1,nysv:nyn,nxl:nxr) )
	2000	ALLOCATE( nest_offl%w_top(0:1,nys:nyn,nxl:nxr) )
	2001	IF ( humidity ) ALLOCATE( nest_offl%q_top(0:1,nys:nyn,nxl:nxr) )
	2002	IF ( .NOT. neutral ) ALLOCATE( nest_offl%pt_top(0:1,nys:nyn,nxl:nxr) )
[4273]	2003	IF ( air_chemistry .AND. nesting_offline_chem ) &
	2004	ALLOCATE( nest_offl%chem_top(0:1,nys:nyn,nxl:nxr,1:UBOUND( chem_species, 1 )) )
[3347]	2005	!
[3737]	2006	!-- For chemical species, create the names of the variables. This is necessary
	2007	!-- to identify the respective variable and write it onto the correct array
	2008	!-- in the chem_species datatype.
[4273]	2009	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3737]	2010	ALLOCATE( nest_offl%chem_from_file_l(1:UBOUND( chem_species, 1 )) )
	2011	ALLOCATE( nest_offl%chem_from_file_n(1:UBOUND( chem_species, 1 )) )
	2012	ALLOCATE( nest_offl%chem_from_file_r(1:UBOUND( chem_species, 1 )) )
	2013	ALLOCATE( nest_offl%chem_from_file_s(1:UBOUND( chem_species, 1 )) )
	2014	ALLOCATE( nest_offl%chem_from_file_t(1:UBOUND( chem_species, 1 )) )
[4273]	2015
[3737]	2016	ALLOCATE( nest_offl%var_names_chem_l(1:UBOUND( chem_species, 1 )) )
	2017	ALLOCATE( nest_offl%var_names_chem_n(1:UBOUND( chem_species, 1 )) )
	2018	ALLOCATE( nest_offl%var_names_chem_r(1:UBOUND( chem_species, 1 )) )
	2019	ALLOCATE( nest_offl%var_names_chem_s(1:UBOUND( chem_species, 1 )) )
	2020	ALLOCATE( nest_offl%var_names_chem_t(1:UBOUND( chem_species, 1 )) )
	2021	!
	2022	!-- Initialize flags that indicate whether the variable is on file or
	2023	!-- not. Please note, this is only necessary for chemistry variables.
	2024	nest_offl%chem_from_file_l(:) = .FALSE.
	2025	nest_offl%chem_from_file_n(:) = .FALSE.
	2026	nest_offl%chem_from_file_r(:) = .FALSE.
	2027	nest_offl%chem_from_file_s(:) = .FALSE.
	2028	nest_offl%chem_from_file_t(:) = .FALSE.
[4273]	2029
[3737]	2030	DO n = 1, UBOUND( chem_species, 1 )
	2031	nest_offl%var_names_chem_l(n) = nest_offl%char_l // &
	2032	TRIM(chem_species(n)%name)
	2033	nest_offl%var_names_chem_n(n) = nest_offl%char_n // &
	2034	TRIM(chem_species(n)%name)
	2035	nest_offl%var_names_chem_r(n) = nest_offl%char_r // &
	2036	TRIM(chem_species(n)%name)
	2037	nest_offl%var_names_chem_s(n) = nest_offl%char_s // &
	2038	TRIM(chem_species(n)%name)
	2039	nest_offl%var_names_chem_t(n) = nest_offl%char_t // &
	2040	TRIM(chem_species(n)%name)
	2041	ENDDO
	2042	ENDIF
	2043	!
[4270]	2044	!-- Offline nesting for salsa
	2045	IF ( salsa ) CALL salsa_nesting_offl_init
	2046	!
[4226]	2047	!-- Before initial data input is initiated, check if dynamic input file is
	2048	!-- present.
	2049	IF ( .NOT. input_pids_dynamic ) THEN
	2050	message_string = 'nesting_offline = .TRUE. requires dynamic ' // &
	2051	'input file ' // &
	2052	TRIM( input_file_dynamic ) // TRIM( coupling_char )
	2053	CALL message( 'nesting_offl_init', 'PA0546', 1, 2, 0, 6, 0 )
	2054	ENDIF
	2055	!
[3347]	2056	!-- Read COSMO data at lateral and top boundaries
[4226]	2057	CALL nesting_offl_input
[3347]	2058	!
[4169]	2059	!-- Check if sufficient time steps are provided to cover the entire
	2060	!-- simulation. Note, dynamic input is only required for the 3D simulation,
	2061	!-- not for the soil/wall spinup. However, as the spinup time is added
	2062	!-- to the end_time, this must be considered here.
[4286]	2063	IF ( end_time - spinup_time > nest_offl%time(nest_offl%nt-1) ) THEN
[4226]	2064	message_string = 'end_time of the simulation exceeds the ' // &
	2065	'time dimension in the dynamic input file.'
	2066	CALL message( 'nesting_offl_init', 'PA0183', 1, 2, 0, 6, 0 )
[4169]	2067	ENDIF
	2068	!
[3891]	2069	!-- Initialize boundary data. Please note, do not initialize boundaries in
	2070	!-- case of restart runs. This case the boundaries are already initialized
	2071	!-- and the boundary data from file would be on the wrong time level.
	2072	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
	2073	IF ( bc_dirichlet_l ) THEN
	2074	u(nzb+1:nzt,nys:nyn,0) = nest_offl%u_left(0,nzb+1:nzt,nys:nyn)
	2075	v(nzb+1:nzt,nysv:nyn,-1) = nest_offl%v_left(0,nzb+1:nzt,nysv:nyn)
	2076	w(nzb+1:nzt-1,nys:nyn,-1) = nest_offl%w_left(0,nzb+1:nzt-1,nys:nyn)
	2077	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,-1) = &
	2078	nest_offl%pt_left(0,nzb+1:nzt,nys:nyn)
	2079	IF ( humidity ) q(nzb+1:nzt,nys:nyn,-1) = &
	2080	nest_offl%q_left(0,nzb+1:nzt,nys:nyn)
[4273]	2081	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3891]	2082	DO n = 1, UBOUND( chem_species, 1 )
	2083	IF( nest_offl%chem_from_file_l(n) ) THEN
	2084	chem_species(n)%conc(nzb+1:nzt,nys:nyn,-1) = &
	2085	nest_offl%chem_left(0,nzb+1:nzt,nys:nyn,n)
	2086	ENDIF
	2087	ENDDO
	2088	ENDIF
[3737]	2089	ENDIF
[3891]	2090	IF ( bc_dirichlet_r ) THEN
	2091	u(nzb+1:nzt,nys:nyn,nxr+1) = nest_offl%u_right(0,nzb+1:nzt,nys:nyn)
	2092	v(nzb+1:nzt,nysv:nyn,nxr+1) = nest_offl%v_right(0,nzb+1:nzt,nysv:nyn)
	2093	w(nzb+1:nzt-1,nys:nyn,nxr+1) = nest_offl%w_right(0,nzb+1:nzt-1,nys:nyn)
	2094	IF ( .NOT. neutral ) pt(nzb+1:nzt,nys:nyn,nxr+1) = &
	2095	nest_offl%pt_right(0,nzb+1:nzt,nys:nyn)
	2096	IF ( humidity ) q(nzb+1:nzt,nys:nyn,nxr+1) = &
	2097	nest_offl%q_right(0,nzb+1:nzt,nys:nyn)
[4273]	2098	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3891]	2099	DO n = 1, UBOUND( chem_species, 1 )
	2100	IF( nest_offl%chem_from_file_r(n) ) THEN
	2101	chem_species(n)%conc(nzb+1:nzt,nys:nyn,nxr+1) = &
	2102	nest_offl%chem_right(0,nzb+1:nzt,nys:nyn,n)
	2103	ENDIF
	2104	ENDDO
	2105	ENDIF
[3737]	2106	ENDIF
[3891]	2107	IF ( bc_dirichlet_s ) THEN
	2108	u(nzb+1:nzt,-1,nxlu:nxr) = nest_offl%u_south(0,nzb+1:nzt,nxlu:nxr)
	2109	v(nzb+1:nzt,0,nxl:nxr) = nest_offl%v_south(0,nzb+1:nzt,nxl:nxr)
	2110	w(nzb+1:nzt-1,-1,nxl:nxr) = nest_offl%w_south(0,nzb+1:nzt-1,nxl:nxr)
	2111	IF ( .NOT. neutral ) pt(nzb+1:nzt,-1,nxl:nxr) = &
	2112	nest_offl%pt_south(0,nzb+1:nzt,nxl:nxr)
	2113	IF ( humidity ) q(nzb+1:nzt,-1,nxl:nxr) = &
	2114	nest_offl%q_south(0,nzb+1:nzt,nxl:nxr)
[4273]	2115	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3891]	2116	DO n = 1, UBOUND( chem_species, 1 )
	2117	IF( nest_offl%chem_from_file_s(n) ) THEN
	2118	chem_species(n)%conc(nzb+1:nzt,-1,nxl:nxr) = &
	2119	nest_offl%chem_south(0,nzb+1:nzt,nxl:nxr,n)
	2120	ENDIF
	2121	ENDDO
	2122	ENDIF
[3737]	2123	ENDIF
[3891]	2124	IF ( bc_dirichlet_n ) THEN
	2125	u(nzb+1:nzt,nyn+1,nxlu:nxr) = nest_offl%u_north(0,nzb+1:nzt,nxlu:nxr)
	2126	v(nzb+1:nzt,nyn+1,nxl:nxr) = nest_offl%v_north(0,nzb+1:nzt,nxl:nxr)
	2127	w(nzb+1:nzt-1,nyn+1,nxl:nxr) = nest_offl%w_north(0,nzb+1:nzt-1,nxl:nxr)
	2128	IF ( .NOT. neutral ) pt(nzb+1:nzt,nyn+1,nxl:nxr) = &
	2129	nest_offl%pt_north(0,nzb+1:nzt,nxl:nxr)
	2130	IF ( humidity ) q(nzb+1:nzt,nyn+1,nxl:nxr) = &
	2131	nest_offl%q_north(0,nzb+1:nzt,nxl:nxr)
[4273]	2132	IF ( air_chemistry .AND. nesting_offline_chem ) THEN
[3891]	2133	DO n = 1, UBOUND( chem_species, 1 )
	2134	IF( nest_offl%chem_from_file_n(n) ) THEN
	2135	chem_species(n)%conc(nzb+1:nzt,nyn+1,nxl:nxr) = &
	2136	nest_offl%chem_north(0,nzb+1:nzt,nxl:nxr,n)
	2137	ENDIF
	2138	ENDDO
	2139	ENDIF
[3737]	2140	ENDIF
[4273]	2141	!
[4581]	2142	!-- In case of offline nesting the pressure forms itself based on the prescribed lateral
	2143	!-- boundary conditions. Hence, explicit forcing by pressure gradients via geostrophic
	2144	!-- wind components is not necessary and would be canceled out by the perturbation
	2145	!-- pressure otherwise. For this reason, set geostrophic wind components to zero.
	2146	ug(nzb+1:nzt) = 0.0_wp
	2147	vg(nzb+1:nzt) = 0.0_wp
	2148
[4273]	2149	ENDIF
[3347]	2150	!
	2151	!-- After boundary data is initialized, mask topography at the
	2152	!-- boundaries for the velocity components.
[4346]	2153	u = MERGE( u, 0.0_wp, BTEST( wall_flags_total_0, 1 ) )
	2154	v = MERGE( v, 0.0_wp, BTEST( wall_flags_total_0, 2 ) )
	2155	w = MERGE( w, 0.0_wp, BTEST( wall_flags_total_0, 3 ) )
[3891]	2156	!
	2157	!-- Initial calculation of the boundary layer depth from the prescribed
	2158	!-- boundary data. This is requiered for initialize the synthetic turbulence
	2159	!-- generator correctly.
[4022]	2160	CALL nesting_offl_calc_zi
[3347]	2161
	2162	!
[3891]	2163	!-- After boundary data is initialized, ensure mass conservation. Not
	2164	!-- necessary in restart runs.
	2165	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
	2166	CALL nesting_offl_mass_conservation
	2167	ENDIF
[3347]	2168
	2169	END SUBROUTINE nesting_offl_init
	2170
	2171	!------------------------------------------------------------------------------!
	2172	! Description:
	2173	!------------------------------------------------------------------------------!
	2174	!> Interpolation function, used to interpolate boundary data in time.
	2175	!------------------------------------------------------------------------------!
	2176	FUNCTION interpolate_in_time( var_t1, var_t2, fac )
	2177
	2178	REAL(wp) :: interpolate_in_time !< time-interpolated boundary value
	2179	REAL(wp) :: var_t1 !< boundary value at t1
	2180	REAL(wp) :: var_t2 !< boundary value at t2
	2181	REAL(wp) :: fac !< interpolation factor
	2182
	2183	interpolate_in_time = ( 1.0_wp - fac ) * var_t1 + fac * var_t2
	2184
	2185	END FUNCTION interpolate_in_time
	2186
	2187
	2188
	2189	END MODULE nesting_offl_mod

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