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source: palm/trunk/SOURCE/init_masks.f90 @ 1217

Last change on this file since 1217 was 1187, checked in by raasch, 11 years ago
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[298]	1	SUBROUTINE init_masks
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later 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 1997-2012 Leibniz University Hannover
	18	!--------------------------------------------------------------------------------!
	19	!
[484]	20	! Current revisions:
[298]	21	! -----------------
	22	!
[1187]	23	!
[298]	24	! Former revisions:
	25	! -----------------
	26	! $Id: init_masks.f90 1187 2013-06-18 06:26:33Z raasch $
	27	!
[1187]	28	! 1186 2013-06-18 06:22:52Z raasch
	29	! bugfix: 0.0 replaced by zu(nzb) as the lowest default height level for masks,
	30	! because a zero value does not work in case of ocean runs
	31	!
[1037]	32	! 1036 2012-10-22 13:43:42Z raasch
	33	! code put under GPL (PALM 3.9)
	34	!
[1033]	35	! 1032 2012-10-21 13:03:21Z letzel
	36	! mask locations determined based on scalar positions
	37	!
[1035]	38	! 1031 2012-10-19 14:35:30Z raasch
	39	! netCDF4 without parallel file support implemented
	40	!
[997]	41	! 996 2012-09-07 10:41:47Z raasch
	42	! little reformatting
	43	!
[979]	44	! 978 2012-08-09 08:28:32Z fricke
	45	! +z0h*
	46	!
[810]	47	! 809 2012-01-30 13:32:58Z maronga
	48	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	49	!
[808]	50	! 807 2012-01-25 11:53:51Z maronga
	51	! New cpp directive "__check" implemented which is used by check_namelist_files
	52	!
[772]	53	! 771 2011-10-27 10:56:21Z heinze
	54	! +lpt
	55	!
[596]	56	! 595 2010-11-12 09:52:10Z helmke
	57	! Calculation of z locations for masked output changed
	58	!
[565]	59	! 564 2010-09-30 13:18:59Z helmke
	60	! assignment of mask_xyz_loop added, palm message identifiers of masked output
	61	! changed
[1186]	62	!/localdata/raasch.14299
[558]	63	! 557 2010-09-07 14:50:07Z weinreis
	64	! bugfix message string in set_mask_locations
	65	!
[554]	66	! 553 2010-09-01 14:09:06Z weinreis
	67	! parameters for masked output are replaced by arrays
	68	!
[494]	69	! 493 2010-03-01 08:30:24Z raasch
	70	! netcdf_format_mask* and format_parallel_io replaced by netcdf_data_format
	71	!
[449]	72	! 410 2009-12-04 17:05:40Z letzel
	73	! Initial revision
[298]	74	!
[449]	75	!
[298]	76	! Description:
	77	! ------------
	78	! Initialize masked data output
	79	!------------------------------------------------------------------------------!
	80
	81	USE arrays_3d
	82	USE control_parameters
	83	USE grid_variables
	84	USE indices
	85	USE netcdf_control
	86	USE particle_attributes
	87	USE pegrid
	88
	89	IMPLICIT NONE
	90
	91	CHARACTER (LEN=6) :: var
	92	CHARACTER (LEN=7) :: unit
	93	CHARACTER (LEN=10), DIMENSION(max_masks,100) :: do_mask, do_mask_user
	94
	95	INTEGER :: i, ilen, ind(6), ind_array(1), j, k, n, sender
	96	INTEGER, DIMENSION(:), ALLOCATABLE :: tmp_array
	97
	98	LOGICAL :: found
	99	!
	100	!-- Allocation and initialization
	101	ALLOCATE( tmp_array( MAX(nx,ny,nz)+1 ) )
	102
	103	ALLOCATE( mask_i(max_masks,nxr-nxl+1), &
	104	mask_j(max_masks,nyn-nys+1), &
	105	mask_k(max_masks,nzt-nzb+1) )
	106	!
	107	!-- internal mask arrays ("mask,dimension,selection")
	108	ALLOCATE( mask(max_masks,3,mask_xyz_dimension), &
	109	mask_loop(max_masks,3,3) )
[493]	110
[298]	111	!
[493]	112	!-- Parallel mask output not yet tested
[1031]	113	IF ( netcdf_data_format > 4 ) THEN
[996]	114	message_string = 'netCDF file formats '// &
	115	'3 (netCDF 4) and 4 (netCDF 4 Classic model)'// &
[493]	116	'&are currently not supported (not yet tested).'
[564]	117	CALL message( 'init_masks', 'PA0328', 1, 2, 0, 6, 0 )
[298]	118	ENDIF
[553]	119
[298]	120	!
	121	!-- Store data output parameters for masked data output in few shared arrays
[996]	122	DO mid = 1, masks
[564]	123
[553]	124	do_mask (mid,:) = data_output_masks(mid,:)
	125	do_mask_user(mid,:) = data_output_masks_user(mid,:)
	126	mask (mid,1,:) = mask_x(mid,:)
	127	mask (mid,2,:) = mask_y(mid,:)
	128	mask (mid,3,:) = mask_z(mid,:)
[564]	129
[996]	130	IF ( mask_x_loop(mid,1) == -1.0 .AND. mask_x_loop(mid,2) == -1.0 &
	131	.AND. mask_x_loop(mid,3) == -1.0 ) THEN
	132	mask_loop(mid,1,1:2) = -1.0
[564]	133	mask_loop(mid,1,3) = 0.0
	134	ELSE
	135	mask_loop(mid,1,:) = mask_x_loop(mid,:)
	136	ENDIF
[996]	137	IF ( mask_y_loop(mid,1) == -1.0 .AND. mask_y_loop(mid,2) == -1.0 &
	138	.AND. mask_y_loop(mid,3) == -1.0 ) THEN
	139	mask_loop(mid,2,1:2) = -1.0
[564]	140	mask_loop(mid,2,3) = 0.0
	141	ELSE
	142	mask_loop(mid,2,:) = mask_y_loop(mid,:)
	143	ENDIF
[996]	144	IF ( mask_z_loop(mid,1) == -1.0 .AND. mask_z_loop(mid,2) == -1.0 &
	145	.AND. mask_z_loop(mid,3) == -1.0 ) THEN
	146	mask_loop(mid,3,1:2) = -1.0
[564]	147	mask_loop(mid,3,3) = 0.0
	148	ELSE
	149	mask_loop(mid,3,:) = mask_z_loop(mid,:)
	150	ENDIF
	151
[553]	152	ENDDO
	153
[298]	154	mask_i = -1; mask_j = -1; mask_k = -1
[553]	155
[298]	156	!
	157	!-- Global arrays are required by define_netcdf_header.
[1031]	158	IF ( myid == 0 .OR. netcdf_data_format > 4 ) THEN
[298]	159	ALLOCATE( mask_i_global(max_masks,nx+1), &
	160	mask_j_global(max_masks,ny+1), &
	161	mask_k_global(max_masks,nz+1) )
	162	mask_i_global = -1; mask_j_global = -1; mask_k_global = -1
	163	ENDIF
	164
	165	!
	166	!-- Determine variable names for each mask
	167	DO mid = 1, masks
	168	!
	169	!-- Append user-defined data output variables to the standard data output
	170	IF ( do_mask_user(mid,1) /= ' ' ) THEN
	171	i = 1
	172	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
	173	i = i + 1
	174	ENDDO
	175	j = 1
	176	DO WHILE ( do_mask_user(mid,j) /= ' ' .AND. j <= 100 )
	177	IF ( i > 100 ) THEN
	178	WRITE ( message_string, * ) 'number of output quantitities ', &
	179	'given by data_output_mask and data_output_mask_user ', &
	180	'exceeds the limit of 100'
[564]	181	CALL message( 'init_masks', 'PA0329', 1, 2, 0, 6, 0 )
[298]	182	ENDIF
	183	do_mask(mid,i) = do_mask_user(mid,j)
	184	i = i + 1
	185	j = j + 1
	186	ENDDO
	187	ENDIF
	188
	189	!
	190	!-- Check and set steering parameters for mask data output and averaging
	191	i = 1
[996]	192	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
[298]	193	!
	194	!-- Check for data averaging
	195	ilen = LEN_TRIM( do_mask(mid,i) )
	196	j = 0 ! no data averaging
	197	IF ( ilen > 3 ) THEN
	198	IF ( do_mask(mid,i)(ilen-2:ilen) == '_av' ) THEN
	199	j = 1 ! data averaging
	200	do_mask(mid,i) = do_mask(mid,i)(1:ilen-3)
	201	ENDIF
	202	ENDIF
	203	var = TRIM( do_mask(mid,i) )
	204	!
	205	!-- Check for allowed value and set units
	206	SELECT CASE ( TRIM( var ) )
	207
	208	CASE ( 'e' )
	209	IF ( constant_diffusion ) THEN
	210	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	211	'" requires constant_diffusion = .FALSE.'
[564]	212	CALL message( 'init_masks', 'PA0103', 1, 2, 0, 6, 0 )
[298]	213	ENDIF
	214	unit = 'm2/s2'
	215
[771]	216	CASE ( 'lpt' )
	217	IF ( .NOT. cloud_physics ) THEN
	218	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	219	'" requires cloud_physics = .TRUE.'
[773]	220	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[771]	221	ENDIF
	222	unit = 'K'
	223
[298]	224	CASE ( 'pc', 'pr' )
	225	IF ( .NOT. particle_advection ) THEN
	226	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	227	'" requires a "particles_par"-NAMELIST in the ', &
	228	'parameter file (PARIN)'
[564]	229	CALL message( 'init_masks', 'PA0104', 1, 2, 0, 6, 0 )
[298]	230	ENDIF
	231	IF ( TRIM( var ) == 'pc' ) unit = 'number'
	232	IF ( TRIM( var ) == 'pr' ) unit = 'm'
	233
	234	CASE ( 'q', 'vpt' )
	235	IF ( .NOT. humidity ) THEN
	236	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	237	'" requires humidity = .TRUE.'
[564]	238	CALL message( 'init_masks', 'PA0105', 1, 2, 0, 6, 0 )
[298]	239	ENDIF
	240	IF ( TRIM( var ) == 'q' ) unit = 'kg/kg'
	241	IF ( TRIM( var ) == 'vpt' ) unit = 'K'
	242
	243	CASE ( 'ql' )
	244	IF ( .NOT. ( cloud_physics .OR. cloud_droplets ) ) THEN
	245	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	246	'" requires cloud_physics = .TRUE. or cloud_droplets', &
	247	' = .TRUE.'
[564]	248	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	249	ENDIF
	250	unit = 'kg/kg'
	251
	252	CASE ( 'ql_c', 'ql_v', 'ql_vp' )
	253	IF ( .NOT. cloud_droplets ) THEN
	254	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	255	'" requires cloud_droplets = .TRUE.'
[564]	256	CALL message( 'init_masks', 'PA0107', 1, 2, 0, 6, 0 )
[298]	257	ENDIF
	258	IF ( TRIM( var ) == 'ql_c' ) unit = 'kg/kg'
	259	IF ( TRIM( var ) == 'ql_v' ) unit = 'm3'
	260	IF ( TRIM( var ) == 'ql_vp' ) unit = 'none'
	261
	262	CASE ( 'qv' )
	263	IF ( .NOT. cloud_physics ) THEN
	264	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	265	'" requires cloud_physics = .TRUE.'
[564]	266	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	267	ENDIF
	268	unit = 'kg/kg'
	269
	270	CASE ( 'rho' )
	271	IF ( .NOT. ocean ) THEN
	272	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	273	'" requires ocean = .TRUE.'
[564]	274	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
[298]	275	ENDIF
	276	unit = 'kg/m3'
	277
	278	CASE ( 's' )
	279	IF ( .NOT. passive_scalar ) THEN
	280	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	281	'" requires passive_scalar = .TRUE.'
[564]	282	CALL message( 'init_masks', 'PA0110', 1, 2, 0, 6, 0 )
[298]	283	ENDIF
	284	unit = 'conc'
	285
	286	CASE ( 'sa' )
	287	IF ( .NOT. ocean ) THEN
	288	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	289	'" requires ocean = .TRUE.'
[564]	290	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
[298]	291	ENDIF
	292	unit = 'psu'
	293
[978]	294	CASE ( 'u', 't', 'lwp', 'pra', 'prr', 'z0', 'z0h*' )
[298]	295	WRITE ( message_string, * ) 'illegal value for data_',&
	296	'output: "', TRIM( var ), '" is only allowed', &
	297	'for horizontal cross section'
[564]	298	CALL message( 'init_masks', 'PA0111', 1, 2, 0, 6, 0 )
[298]	299
	300	CASE ( 'p', 'pt', 'u', 'v', 'w' )
	301	IF ( TRIM( var ) == 'p' ) unit = 'Pa'
	302	IF ( TRIM( var ) == 'pt' ) unit = 'K'
	303	IF ( TRIM( var ) == 'u' ) unit = 'm/s'
	304	IF ( TRIM( var ) == 'v' ) unit = 'm/s'
	305	IF ( TRIM( var ) == 'w' ) unit = 'm/s'
	306	CONTINUE
	307
	308	CASE DEFAULT
	309	CALL user_check_data_output( var, unit )
	310
	311	IF ( unit == 'illegal' ) THEN
	312	IF ( do_mask_user(mid,1) /= ' ' ) THEN
	313	WRITE ( message_string, * ) 'illegal value for data_',&
	314	'output or data_output_user: "', &
	315	TRIM( do_mask(mid,i) ), '"'
[564]	316	CALL message( 'init_masks', 'PA0114', 1, 2, 0, 6, 0 )
[298]	317	ELSE
	318	WRITE ( message_string, * ) 'illegal value for data_',&
	319	'output: "', TRIM( do_mask(mid,i) ), '"'
[564]	320	CALL message( 'init_masks', 'PA0330', 1, 2, 0, 6, 0 )
[298]	321	ENDIF
	322	ENDIF
	323
	324	END SELECT
	325	!
	326	!-- Set the internal steering parameters appropriately
	327	domask_no(mid,j) = domask_no(mid,j) + 1
	328	domask(mid,j,domask_no(mid,j)) = do_mask(mid,i)
	329	domask_unit(mid,j,domask_no(mid,j)) = unit
	330
	331	IF ( j == 1 ) THEN
	332	!
	333	!-- Check, if variable is already subject to averaging
	334	found = .FALSE.
	335	DO k = 1, doav_n
	336	IF ( TRIM( doav(k) ) == TRIM( var ) ) found = .TRUE.
	337	ENDDO
	338
	339	IF ( .NOT. found ) THEN
	340	doav_n = doav_n + 1
	341	doav(doav_n) = var
	342	ENDIF
	343	ENDIF
	344
	345	i = i + 1
	346
	347	ENDDO ! do_mask(mid,i)
	348	ENDDO ! mid
	349
	350
	351	!
	352	!-- Determine mask locations for each mask
	353	DO mid = 1, masks
	354	!
	355	!-- Set local masks for each subdomain along all three dimensions
	356	CALL set_mask_locations( 1, dx, 'dx', nx, 'nx', nxl, nxr )
	357	CALL set_mask_locations( 2, dy, 'dy', ny, 'ny', nys, nyn )
	358	CALL set_mask_locations( 3, dz, 'dz', nz, 'nz', nzb, nzt )
	359	!
	360	!-- Set global masks along all three dimensions (required by
	361	!-- define_netcdf_header).
[809]	362	#if defined( __parallel ) && ! defined ( __check )
[298]	363	!
	364	!-- PE0 receives partial arrays from all processors of the respective mask
	365	!-- and outputs them. Here a barrier has to be set, because otherwise
	366	!-- "-MPI- FATAL: Remote protocol queue full" may occur.
[807]	367
[298]	368	CALL MPI_BARRIER( comm2d, ierr )
	369
	370	IF ( myid == 0 ) THEN
	371	!
	372	!-- Local arrays can be relocated directly.
	373	mask_i_global(mid,mask_start_l(mid,1): &
	374	mask_start_l(mid,1)+mask_size_l(mid,1)-1) = &
	375	mask_i(mid,:mask_size_l(mid,1))
	376	mask_j_global(mid,mask_start_l(mid,2): &
	377	mask_start_l(mid,2)+mask_size_l(mid,2)-1) = &
	378	mask_j(mid,:mask_size_l(mid,2))
	379	mask_k_global(mid,mask_start_l(mid,3): &
	380	mask_start_l(mid,3)+mask_size_l(mid,3)-1) = &
	381	mask_k(mid,:mask_size_l(mid,3))
	382	!
	383	!-- Receive data from all other PEs.
	384	DO n = 1, numprocs-1
	385	!
	386	!-- Receive index limits first, then arrays.
	387	!-- Index limits are received in arbitrary order from the PEs.
	388	CALL MPI_RECV( ind(1), 6, MPI_INTEGER, MPI_ANY_SOURCE, 0, &
	389	comm2d, status, ierr )
	390	!
	391	!-- Not all PEs have data for the mask.
	392	IF ( ind(1) /= -9999 ) THEN
	393	sender = status(MPI_SOURCE)
	394	CALL MPI_RECV( tmp_array(ind(1)), ind(2)-ind(1)+1, &
[363]	395	MPI_INTEGER, sender, 1, comm2d, status, ierr )
[298]	396	mask_i_global(mid,ind(1):ind(2)) = tmp_array(ind(1):ind(2))
	397	CALL MPI_RECV( tmp_array(ind(3)), ind(4)-ind(3)+1, &
[363]	398	MPI_INTEGER, sender, 2, comm2d, status, ierr )
[298]	399	mask_j_global(mid,ind(3):ind(4)) = tmp_array(ind(3):ind(4))
	400	CALL MPI_RECV( tmp_array(ind(5)), ind(6)-ind(5)+1, &
[363]	401	MPI_INTEGER, sender, 3, comm2d, status, ierr )
[298]	402	mask_k_global(mid,ind(5):ind(6)) = tmp_array(ind(5):ind(6))
	403	ENDIF
	404	ENDDO
	405
	406	ELSE
	407	!
	408	!-- If at least part of the mask resides on the PE, send the index limits
	409	!-- for the target array, otherwise send -9999 to PE0.
[996]	410	IF ( mask_size_l(mid,1) > 0 .AND. mask_size_l(mid,2) > 0 .AND. &
	411	mask_size_l(mid,3) > 0 ) THEN
[298]	412	ind(1) = mask_start_l(mid,1)
	413	ind(2) = mask_start_l(mid,1) + mask_size_l(mid,1) - 1
	414	ind(3) = mask_start_l(mid,2)
	415	ind(4) = mask_start_l(mid,2) + mask_size_l(mid,2) - 1
	416	ind(5) = mask_start_l(mid,3)
	417	ind(6) = mask_start_l(mid,3) + mask_size_l(mid,3) - 1
	418	ELSE
	419	ind(1) = -9999; ind(2) = -9999
	420	ind(3) = -9999; ind(4) = -9999
	421	ind(5) = -9999; ind(6) = -9999
	422	ENDIF
	423	CALL MPI_SEND( ind(1), 6, MPI_INTEGER, 0, 0, comm2d, ierr )
	424	!
	425	!-- If applicable, send data to PE0.
	426	IF ( ind(1) /= -9999 ) THEN
	427	tmp_array(:mask_size_l(mid,1)) = mask_i(mid,:mask_size_l(mid,1))
	428	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,1), &
[363]	429	MPI_INTEGER, 0, 1, comm2d, ierr )
[298]	430	tmp_array(:mask_size_l(mid,2)) = mask_j(mid,:mask_size_l(mid,2))
	431	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,2), &
[363]	432	MPI_INTEGER, 0, 2, comm2d, ierr )
[298]	433	tmp_array(:mask_size_l(mid,3)) = mask_k(mid,:mask_size_l(mid,3))
	434	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,3), &
[363]	435	MPI_INTEGER, 0, 3, comm2d, ierr )
[298]	436	ENDIF
	437	ENDIF
	438	!
	439	!-- A barrier has to be set, because otherwise some PEs may proceed too fast
	440	!-- so that PE0 may receive wrong data on tag 0.
	441	CALL MPI_BARRIER( comm2d, ierr )
[409]	442
[1031]	443	IF ( netcdf_data_format > 4 ) THEN
[409]	444
[493]	445	CALL MPI_BCAST( mask_i_global(mid,:), nx+1, MPI_INTEGER, 0, comm2d, &
	446	ierr )
	447	CALL MPI_BCAST( mask_j_global(mid,:), ny+1, MPI_INTEGER, 0, comm2d, &
	448	ierr )
	449	CALL MPI_BCAST( mask_k_global(mid,:), nz+1, MPI_INTEGER, 0, comm2d, &
	450	ierr )
[409]	451
	452	ENDIF
[298]	453
[809]	454	#elif ! defined ( __parallel )
[298]	455	!
	456	!-- Local arrays can be relocated directly.
	457	mask_i_global(mid,:) = mask_i(mid,:)
	458	mask_j_global(mid,:) = mask_j(mid,:)
	459	mask_k_global(mid,:) = mask_k(mid,:)
	460	#endif
	461	ENDDO ! mid
	462
	463	DEALLOCATE( tmp_array )
	464	!
	465	!-- Internal mask arrays cannot be deallocated on PE 0 because they are
	466	!-- required for header output on PE 0.
	467	IF ( myid /= 0 ) DEALLOCATE( mask, mask_loop )
	468
	469	CONTAINS
[493]	470
[298]	471	SUBROUTINE set_mask_locations( dim, dxyz, dxyz_string, nxyz, nxyz_string, &
	472	lb, ub )
	473	!------------------------------------------------------------------------------!
	474	!
	475	! Description:
	476	! ------------
	477	! Set local mask for each subdomain along 'dim' direction.
	478	!------------------------------------------------------------------------------!
	479
	480	IMPLICIT NONE
	481
	482	CHARACTER (LEN=2) :: dxyz_string, nxyz_string
	483	INTEGER :: count, count_l, dim, m, loop_begin, loop_end, loop_stride, &
	484	lb, nxyz, ub
	485	REAL :: dxyz, ddxyz, tmp1, tmp2
	486
	487	count = 0; count_l = 0; ddxyz = 1.0 / dxyz; tmp1 = 0.0; tmp2 = 0.0
	488
	489	IF ( mask(mid,dim,1) >= 0.0 ) THEN
	490	!
	491	!-- use predefined mask_* array
	492	DO WHILE ( mask(mid,dim,count+1) >= 0.0 )
	493	count = count + 1
	494	IF ( dim == 1 .OR. dim == 2 ) THEN
[1032]	495	m = NINT( mask(mid,dim,count) * mask_scale(dim) * ddxyz - 0.5 )
[298]	496	ELSEIF ( dim == 3 ) THEN
	497	ind_array = &
[595]	498	MINLOC( ABS( mask(mid,dim,count) * mask_scale(dim) - zu ) )
[298]	499	m = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	500	ENDIF
	501	IF ( m > nxyz ) THEN
[303]	502	WRITE ( message_string, '(I3,A,I3,A,I1,3A,I3)' ) &
	503	m,' in mask ',mid,' along dimension ',dim, &
	504	' exceeds ',nxyz_string,' = ',nxyz
[564]	505	CALL message( 'init_masks', 'PA0331', 1, 2, 0, 6, 0 )
[298]	506	ENDIF
	507	IF ( m >= lb .AND. m <= ub ) THEN
	508	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
	509	count_l = count_l + 1
	510	IF ( dim == 1 ) THEN
	511	mask_i(mid,count_l) = m
	512	ELSEIF ( dim == 2 ) THEN
	513	mask_j(mid,count_l) = m
	514	ELSEIF ( dim == 3 ) THEN
	515	mask_k(mid,count_l) = m
	516	ENDIF
	517	ENDIF
	518	IF ( count == mask_xyz_dimension ) EXIT
	519	ENDDO
	520	mask_size(mid,dim) = count
	521	mask_size_l(mid,dim) = count_l
	522
	523	ELSE
	524	!
	525	!-- use predefined mask_loop_* array, or use the default (all grid points
	526	!-- along this direction)
	527	IF ( mask_loop(mid,dim,1) < 0.0 ) THEN
	528	tmp1 = mask_loop(mid,dim,1)
[1186]	529	mask_loop(mid,dim,1) = zw(nzb) ! lowest level (default)
[298]	530	ENDIF
	531	IF ( dim == 1 .OR. dim == 2 ) THEN
	532	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
	533	tmp2 = mask_loop(mid,dim,2)
[303]	534	mask_loop(mid,dim,2) = nxyz*dxyz / mask_scale(dim) ! (default)
[298]	535	ENDIF
	536	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
[303]	537	> nxyz * dxyz / mask_scale(dim) ) THEN
	538	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),5A,I1,A,F9.3)' ) &
	539	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
	540	' and/or mask_loop(',mid,',',dim,',2)=', &
	541	mask_loop(mid,dim,2),'&exceed ', &
	542	nxyz_string,'*',dxyz_string,'/mask_scale(',dim,')=', &
	543	nxyz*dxyz/mask_scale(dim)
[564]	544	CALL message( 'init_masks', 'PA0332', 1, 2, 0, 6, 0 )
[298]	545	ENDIF
[1032]	546	loop_begin = NINT( mask_loop(mid,dim,1) * mask_scale(dim) &
	547	* ddxyz - 0.5 )
	548	loop_end = NINT( mask_loop(mid,dim,2) * mask_scale(dim) &
	549	* ddxyz - 0.5 )
	550	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) &
	551	* ddxyz )
[298]	552	ELSEIF ( dim == 3 ) THEN
	553	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
	554	tmp2 = mask_loop(mid,dim,2)
[595]	555	mask_loop(mid,dim,2) = zu(nz) / mask_scale(dim) ! (default)
[298]	556	ENDIF
	557	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
[595]	558	> zu(nz) / mask_scale(dim) ) THEN
[303]	559	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),A,I1,A,F9.3)' ) &
	560	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
	561	' and/or mask_loop(',mid,',',dim,',2)=', &
[595]	562	mask_loop(mid,dim,2),'&exceed zu(nz)/mask_scale(',dim, &
	563	')=',zu(nz)/mask_scale(dim)
[564]	564	CALL message( 'init_masks', 'PA0333', 1, 2, 0, 6, 0 )
[298]	565	ENDIF
[303]	566	ind_array = &
[595]	567	MINLOC( ABS( mask_loop(mid,dim,1) * mask_scale(dim) - zu ) )
[298]	568	loop_begin = &
[303]	569	ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	570	ind_array = &
[595]	571	MINLOC( ABS( mask_loop(mid,dim,2) * mask_scale(dim) - zu ) )
[298]	572	loop_end = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	573	!
[303]	574	!-- The following line assumes a constant vertical grid spacing within
	575	!-- the vertical mask range; it fails for vertical grid stretching.
	576	!-- Maybe revise later. Issue warning but continue execution.
	577	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
	578
	579	IF ( mask_loop(mid,dim,2) * mask_scale(dim) > dz_stretch_level ) &
	580	THEN
[557]	581	WRITE ( message_string, '(A,I3,A,I1,A,F9.3,A,F8.2,3A)' ) &
	582	'mask_loop(',mid,',',dim,',2)=', mask_loop(mid,dim,2),&
[303]	583	' exceeds dz_stretch_level=',dz_stretch_level, &
	584	'.&Vertical mask locations will not ', &
	585	'match the desired heights&within the stretching ', &
	586	'region. Recommendation: use mask instead of mask_loop.'
[564]	587	CALL message( 'init_masks', 'PA0334', 0, 1, 0, 6, 0 )
[303]	588	ENDIF
	589
[298]	590	ENDIF
	591	!
	592	!-- If necessary, reset mask_loop(mid,dim,1) and mask_loop(mid,dim,2).
	593	IF ( tmp1 < 0.0 ) mask_loop(mid,dim,1) = tmp1
	594	IF ( tmp2 < 0.0 ) mask_loop(mid,dim,2) = tmp2
	595	!
	596	!-- The default stride +/-1 (every grid point) applies if
	597	!-- mask_loop(mid,dim,3) is not specified (its default is zero).
	598	IF ( loop_stride == 0 ) THEN
	599	IF ( loop_end >= loop_begin ) THEN
	600	loop_stride = 1
	601	ELSE
	602	loop_stride = -1
	603	ENDIF
	604	ENDIF
	605	DO m = loop_begin, loop_end, loop_stride
	606	count = count + 1
[996]	607	IF ( m >= lb .AND. m <= ub ) THEN
[298]	608	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
	609	count_l = count_l + 1
	610	IF ( dim == 1 ) THEN
	611	mask_i(mid,count_l) = m
	612	ELSEIF ( dim == 2 ) THEN
	613	mask_j(mid,count_l) = m
	614	ELSEIF ( dim == 3 ) THEN
	615	mask_k(mid,count_l) = m
	616	ENDIF
	617	ENDIF
	618	ENDDO
	619	mask_size(mid,dim) = count
	620	mask_size_l(mid,dim) = count_l
	621	ENDIF
	622
	623	END SUBROUTINE set_mask_locations
	624
	625	END SUBROUTINE init_masks

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