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source: palm/trunk/SOURCE/init_masks.f90 @ 757

Last change on this file since 757 was 596, checked in by helmke, 14 years ago
last commit documented
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[298]	1	SUBROUTINE init_masks
	2
	3	!------------------------------------------------------------------------------!
[484]	4	! Current revisions:
[298]	5	! -----------------
[596]	6	!
[298]	7	!
	8	! Former revisions:
	9	! -----------------
	10	! $Id: init_masks.f90 596 2010-11-12 09:57:10Z helmke $
	11	!
[596]	12	! 595 2010-11-12 09:52:10Z helmke
	13	! Calculation of z locations for masked output changed
	14	!
[565]	15	! 564 2010-09-30 13:18:59Z helmke
	16	! assignment of mask_xyz_loop added, palm message identifiers of masked output
	17	! changed
	18	!
[558]	19	! 557 2010-09-07 14:50:07Z weinreis
	20	! bugfix message string in set_mask_locations
	21	!
[554]	22	! 553 2010-09-01 14:09:06Z weinreis
	23	! parameters for masked output are replaced by arrays
	24	!
[494]	25	! 493 2010-03-01 08:30:24Z raasch
	26	! netcdf_format_mask* and format_parallel_io replaced by netcdf_data_format
	27	!
[449]	28	! 410 2009-12-04 17:05:40Z letzel
	29	! Initial revision
[298]	30	!
[449]	31	!
[298]	32	! Description:
	33	! ------------
	34	! Initialize masked data output
	35	!------------------------------------------------------------------------------!
	36
	37	USE arrays_3d
	38	USE control_parameters
	39	USE grid_variables
	40	USE indices
	41	USE netcdf_control
	42	USE particle_attributes
	43	USE pegrid
	44
	45	IMPLICIT NONE
	46
	47	CHARACTER (LEN=6) :: var
	48	CHARACTER (LEN=7) :: unit
	49	CHARACTER (LEN=10), DIMENSION(max_masks,100) :: do_mask, do_mask_user
	50
	51	INTEGER :: i, ilen, ind(6), ind_array(1), j, k, n, sender
	52	INTEGER, DIMENSION(:), ALLOCATABLE :: tmp_array
	53
	54	LOGICAL :: found
	55	!
	56	!-- Allocation and initialization
	57	ALLOCATE( tmp_array( MAX(nx,ny,nz)+1 ) )
	58
	59	ALLOCATE( mask_i(max_masks,nxr-nxl+1), &
	60	mask_j(max_masks,nyn-nys+1), &
	61	mask_k(max_masks,nzt-nzb+1) )
	62	!
	63	!-- internal mask arrays ("mask,dimension,selection")
	64	ALLOCATE( mask(max_masks,3,mask_xyz_dimension), &
	65	mask_loop(max_masks,3,3) )
[493]	66
[298]	67	!
[493]	68	!-- Parallel mask output not yet tested
	69	IF ( netcdf_data_format > 2 ) THEN
	70	message_string = 'NetCDF file formats '// &
	71	'3 (NetCDF 4) and 4 (NetCDF 4 Classic model)'// &
	72	'&are currently not supported (not yet tested).'
[564]	73	CALL message( 'init_masks', 'PA0328', 1, 2, 0, 6, 0 )
[298]	74	ENDIF
[553]	75
[298]	76	!
	77	!-- Store data output parameters for masked data output in few shared arrays
[553]	78	DO mid = 1, masks
[564]	79
[553]	80	do_mask (mid,:) = data_output_masks(mid,:)
	81	do_mask_user(mid,:) = data_output_masks_user(mid,:)
	82	mask (mid,1,:) = mask_x(mid,:)
	83	mask (mid,2,:) = mask_y(mid,:)
	84	mask (mid,3,:) = mask_z(mid,:)
[564]	85
	86	IF ( mask_x_loop(mid,1) == -1.0 .AND. mask_x_loop(mid,2) == -1.0 &
	87	.AND. mask_x_loop(mid,3) == -1.0 ) THEN
	88	mask_loop(mid,1,1:2) = -1.0
	89	mask_loop(mid,1,3) = 0.0
	90	ELSE
	91	mask_loop(mid,1,:) = mask_x_loop(mid,:)
	92	ENDIF
	93	IF ( mask_y_loop(mid,1) == -1.0 .AND. mask_y_loop(mid,2) == -1.0 &
	94	.AND. mask_y_loop(mid,3) == -1.0 ) THEN
	95	mask_loop(mid,2,1:2) = -1.0
	96	mask_loop(mid,2,3) = 0.0
	97	ELSE
	98	mask_loop(mid,2,:) = mask_y_loop(mid,:)
	99	ENDIF
	100	IF ( mask_z_loop(mid,1) == -1.0 .AND. mask_z_loop(mid,2) == -1.0 &
	101	.AND. mask_z_loop(mid,3) == -1.0 ) THEN
	102	mask_loop(mid,3,1:2) = -1.0
	103	mask_loop(mid,3,3) = 0.0
	104	ELSE
	105	mask_loop(mid,3,:) = mask_z_loop(mid,:)
	106	ENDIF
	107
[553]	108	ENDDO
	109
[298]	110	mask_i = -1; mask_j = -1; mask_k = -1
[553]	111
[298]	112	!
	113	!-- Global arrays are required by define_netcdf_header.
[493]	114	IF ( myid == 0 .OR. netcdf_data_format > 2 ) THEN
[298]	115	ALLOCATE( mask_i_global(max_masks,nx+1), &
	116	mask_j_global(max_masks,ny+1), &
	117	mask_k_global(max_masks,nz+1) )
	118	mask_i_global = -1; mask_j_global = -1; mask_k_global = -1
	119	ENDIF
	120
	121	!
	122	!-- Determine variable names for each mask
	123	DO mid = 1, masks
	124	!
	125	!-- Append user-defined data output variables to the standard data output
	126	IF ( do_mask_user(mid,1) /= ' ' ) THEN
	127	i = 1
	128	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
	129	i = i + 1
	130	ENDDO
	131	j = 1
	132	DO WHILE ( do_mask_user(mid,j) /= ' ' .AND. j <= 100 )
	133	IF ( i > 100 ) THEN
	134	WRITE ( message_string, * ) 'number of output quantitities ', &
	135	'given by data_output_mask and data_output_mask_user ', &
	136	'exceeds the limit of 100'
[564]	137	CALL message( 'init_masks', 'PA0329', 1, 2, 0, 6, 0 )
[298]	138	ENDIF
	139	do_mask(mid,i) = do_mask_user(mid,j)
	140	i = i + 1
	141	j = j + 1
	142	ENDDO
	143	ENDIF
	144
	145	!
	146	!-- Check and set steering parameters for mask data output and averaging
	147	i = 1
	148	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
	149	!
	150	!-- Check for data averaging
	151	ilen = LEN_TRIM( do_mask(mid,i) )
	152	j = 0 ! no data averaging
	153	IF ( ilen > 3 ) THEN
	154	IF ( do_mask(mid,i)(ilen-2:ilen) == '_av' ) THEN
	155	j = 1 ! data averaging
	156	do_mask(mid,i) = do_mask(mid,i)(1:ilen-3)
	157	ENDIF
	158	ENDIF
	159	var = TRIM( do_mask(mid,i) )
	160	!
	161	!-- Check for allowed value and set units
	162	SELECT CASE ( TRIM( var ) )
	163
	164	CASE ( 'e' )
	165	IF ( constant_diffusion ) THEN
	166	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	167	'" requires constant_diffusion = .FALSE.'
[564]	168	CALL message( 'init_masks', 'PA0103', 1, 2, 0, 6, 0 )
[298]	169	ENDIF
	170	unit = 'm2/s2'
	171
	172	CASE ( 'pc', 'pr' )
	173	IF ( .NOT. particle_advection ) THEN
	174	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	175	'" requires a "particles_par"-NAMELIST in the ', &
	176	'parameter file (PARIN)'
[564]	177	CALL message( 'init_masks', 'PA0104', 1, 2, 0, 6, 0 )
[298]	178	ENDIF
	179	IF ( TRIM( var ) == 'pc' ) unit = 'number'
	180	IF ( TRIM( var ) == 'pr' ) unit = 'm'
	181
	182	CASE ( 'q', 'vpt' )
	183	IF ( .NOT. humidity ) THEN
	184	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	185	'" requires humidity = .TRUE.'
[564]	186	CALL message( 'init_masks', 'PA0105', 1, 2, 0, 6, 0 )
[298]	187	ENDIF
	188	IF ( TRIM( var ) == 'q' ) unit = 'kg/kg'
	189	IF ( TRIM( var ) == 'vpt' ) unit = 'K'
	190
	191	CASE ( 'ql' )
	192	IF ( .NOT. ( cloud_physics .OR. cloud_droplets ) ) THEN
	193	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	194	'" requires cloud_physics = .TRUE. or cloud_droplets', &
	195	' = .TRUE.'
[564]	196	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	197	ENDIF
	198	unit = 'kg/kg'
	199
	200	CASE ( 'ql_c', 'ql_v', 'ql_vp' )
	201	IF ( .NOT. cloud_droplets ) THEN
	202	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	203	'" requires cloud_droplets = .TRUE.'
[564]	204	CALL message( 'init_masks', 'PA0107', 1, 2, 0, 6, 0 )
[298]	205	ENDIF
	206	IF ( TRIM( var ) == 'ql_c' ) unit = 'kg/kg'
	207	IF ( TRIM( var ) == 'ql_v' ) unit = 'm3'
	208	IF ( TRIM( var ) == 'ql_vp' ) unit = 'none'
	209
	210	CASE ( 'qv' )
	211	IF ( .NOT. cloud_physics ) THEN
	212	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	213	'" requires cloud_physics = .TRUE.'
[564]	214	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	215	ENDIF
	216	unit = 'kg/kg'
	217
	218	CASE ( 'rho' )
	219	IF ( .NOT. ocean ) THEN
	220	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	221	'" requires ocean = .TRUE.'
[564]	222	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
[298]	223	ENDIF
	224	unit = 'kg/m3'
	225
	226	CASE ( 's' )
	227	IF ( .NOT. passive_scalar ) THEN
	228	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	229	'" requires passive_scalar = .TRUE.'
[564]	230	CALL message( 'init_masks', 'PA0110', 1, 2, 0, 6, 0 )
[298]	231	ENDIF
	232	unit = 'conc'
	233
	234	CASE ( 'sa' )
	235	IF ( .NOT. ocean ) THEN
	236	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	237	'" requires ocean = .TRUE.'
[564]	238	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
[298]	239	ENDIF
	240	unit = 'psu'
	241
	242	CASE ( 'u', 't', 'lwp', 'pra', 'prr', 'z0' )
	243	WRITE ( message_string, * ) 'illegal value for data_',&
	244	'output: "', TRIM( var ), '" is only allowed', &
	245	'for horizontal cross section'
[564]	246	CALL message( 'init_masks', 'PA0111', 1, 2, 0, 6, 0 )
[298]	247	! IF ( TRIM( var ) == 'lwp*' .AND. .NOT. cloud_physics ) THEN
	248	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	249	! '" requires cloud_physics = .TRUE.'
[564]	250	! CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	251	! ENDIF
	252	! IF ( TRIM( var ) == 'pra*' .AND. .NOT. precipitation ) THEN
	253	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	254	! '" requires precipitation = .TRUE.'
[564]	255	! CALL message( 'init_masks', 'PA0112', 1, 2, 0, 6, 0 )
[298]	256	! ENDIF
	257	! IF ( TRIM( var ) == 'pra*' .AND. j == 1 ) THEN
	258	! WRITE ( message_string, * ) 'temporal averaging of ', &
	259	! ' precipitation amount "', TRIM( var ), &
	260	! '" not possible'
[564]	261	! CALL message( 'init_masks', 'PA0113', 1, 2, 0, 6, 0 )
[298]	262	! ENDIF
	263	! IF ( TRIM( var ) == 'prr*' .AND. .NOT. precipitation ) THEN
	264	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	265	! '" requires precipitation = .TRUE.'
[564]	266	! CALL message( 'init_masks', 'PA0112', 1, 2, 0, 6, 0 )
[298]	267	! ENDIF
	268	!
	269	! IF ( TRIM( var ) == 'u*' ) unit = 'm/s'
	270	! IF ( TRIM( var ) == 't*' ) unit = 'K'
	271	! IF ( TRIM( var ) == 'lwp' ) unit = 'kg/kgm'
	272	! IF ( TRIM( var ) == 'pra*' ) unit = 'mm'
	273	! IF ( TRIM( var ) == 'prr*' ) unit = 'mm/s'
	274	! IF ( TRIM( var ) == 'z0*' ) unit = 'm'
	275
	276	CASE ( 'p', 'pt', 'u', 'v', 'w' )
	277	IF ( TRIM( var ) == 'p' ) unit = 'Pa'
	278	IF ( TRIM( var ) == 'pt' ) unit = 'K'
	279	IF ( TRIM( var ) == 'u' ) unit = 'm/s'
	280	IF ( TRIM( var ) == 'v' ) unit = 'm/s'
	281	IF ( TRIM( var ) == 'w' ) unit = 'm/s'
	282	CONTINUE
	283
	284	CASE DEFAULT
	285	CALL user_check_data_output( var, unit )
	286
	287	IF ( unit == 'illegal' ) THEN
	288	IF ( do_mask_user(mid,1) /= ' ' ) THEN
	289	WRITE ( message_string, * ) 'illegal value for data_',&
	290	'output or data_output_user: "', &
	291	TRIM( do_mask(mid,i) ), '"'
[564]	292	CALL message( 'init_masks', 'PA0114', 1, 2, 0, 6, 0 )
[298]	293	ELSE
	294	WRITE ( message_string, * ) 'illegal value for data_',&
	295	'output: "', TRIM( do_mask(mid,i) ), '"'
[564]	296	CALL message( 'init_masks', 'PA0330', 1, 2, 0, 6, 0 )
[298]	297	ENDIF
	298	ENDIF
	299
	300	END SELECT
	301	!
	302	!-- Set the internal steering parameters appropriately
	303	domask_no(mid,j) = domask_no(mid,j) + 1
	304	domask(mid,j,domask_no(mid,j)) = do_mask(mid,i)
	305	domask_unit(mid,j,domask_no(mid,j)) = unit
	306
	307	IF ( j == 1 ) THEN
	308	!
	309	!-- Check, if variable is already subject to averaging
	310	found = .FALSE.
	311	DO k = 1, doav_n
	312	IF ( TRIM( doav(k) ) == TRIM( var ) ) found = .TRUE.
	313	ENDDO
	314
	315	IF ( .NOT. found ) THEN
	316	doav_n = doav_n + 1
	317	doav(doav_n) = var
	318	ENDIF
	319	ENDIF
	320
	321	i = i + 1
	322
	323	ENDDO ! do_mask(mid,i)
	324	ENDDO ! mid
	325
	326
	327	!
	328	!-- Determine mask locations for each mask
	329	DO mid = 1, masks
	330	!
	331	!-- Set local masks for each subdomain along all three dimensions
	332	CALL set_mask_locations( 1, dx, 'dx', nx, 'nx', nxl, nxr )
	333	CALL set_mask_locations( 2, dy, 'dy', ny, 'ny', nys, nyn )
	334	CALL set_mask_locations( 3, dz, 'dz', nz, 'nz', nzb, nzt )
	335	!
	336	!-- Set global masks along all three dimensions (required by
	337	!-- define_netcdf_header).
	338	#if defined( __parallel )
	339	!
	340	!-- PE0 receives partial arrays from all processors of the respective mask
	341	!-- and outputs them. Here a barrier has to be set, because otherwise
	342	!-- "-MPI- FATAL: Remote protocol queue full" may occur.
	343	CALL MPI_BARRIER( comm2d, ierr )
	344
	345	IF ( myid == 0 ) THEN
	346	!
	347	!-- Local arrays can be relocated directly.
	348	mask_i_global(mid,mask_start_l(mid,1): &
	349	mask_start_l(mid,1)+mask_size_l(mid,1)-1) = &
	350	mask_i(mid,:mask_size_l(mid,1))
	351	mask_j_global(mid,mask_start_l(mid,2): &
	352	mask_start_l(mid,2)+mask_size_l(mid,2)-1) = &
	353	mask_j(mid,:mask_size_l(mid,2))
	354	mask_k_global(mid,mask_start_l(mid,3): &
	355	mask_start_l(mid,3)+mask_size_l(mid,3)-1) = &
	356	mask_k(mid,:mask_size_l(mid,3))
	357	!
	358	!-- Receive data from all other PEs.
	359	DO n = 1, numprocs-1
	360	!
	361	!-- Receive index limits first, then arrays.
	362	!-- Index limits are received in arbitrary order from the PEs.
	363	CALL MPI_RECV( ind(1), 6, MPI_INTEGER, MPI_ANY_SOURCE, 0, &
	364	comm2d, status, ierr )
	365	!
	366	!-- Not all PEs have data for the mask.
	367	IF ( ind(1) /= -9999 ) THEN
	368	sender = status(MPI_SOURCE)
	369	CALL MPI_RECV( tmp_array(ind(1)), ind(2)-ind(1)+1, &
[363]	370	MPI_INTEGER, sender, 1, comm2d, status, ierr )
[298]	371	mask_i_global(mid,ind(1):ind(2)) = tmp_array(ind(1):ind(2))
	372	CALL MPI_RECV( tmp_array(ind(3)), ind(4)-ind(3)+1, &
[363]	373	MPI_INTEGER, sender, 2, comm2d, status, ierr )
[298]	374	mask_j_global(mid,ind(3):ind(4)) = tmp_array(ind(3):ind(4))
	375	CALL MPI_RECV( tmp_array(ind(5)), ind(6)-ind(5)+1, &
[363]	376	MPI_INTEGER, sender, 3, comm2d, status, ierr )
[298]	377	mask_k_global(mid,ind(5):ind(6)) = tmp_array(ind(5):ind(6))
	378	ENDIF
	379	ENDDO
	380
	381	ELSE
	382	!
	383	!-- If at least part of the mask resides on the PE, send the index limits
	384	!-- for the target array, otherwise send -9999 to PE0.
	385	IF ( mask_size_l(mid,1) > 0 .AND. mask_size_l(mid,2) > 0 .AND. &
	386	mask_size_l(mid,3) > 0 ) &
	387	THEN
	388	ind(1) = mask_start_l(mid,1)
	389	ind(2) = mask_start_l(mid,1) + mask_size_l(mid,1) - 1
	390	ind(3) = mask_start_l(mid,2)
	391	ind(4) = mask_start_l(mid,2) + mask_size_l(mid,2) - 1
	392	ind(5) = mask_start_l(mid,3)
	393	ind(6) = mask_start_l(mid,3) + mask_size_l(mid,3) - 1
	394	ELSE
	395	ind(1) = -9999; ind(2) = -9999
	396	ind(3) = -9999; ind(4) = -9999
	397	ind(5) = -9999; ind(6) = -9999
	398	ENDIF
	399	CALL MPI_SEND( ind(1), 6, MPI_INTEGER, 0, 0, comm2d, ierr )
	400	!
	401	!-- If applicable, send data to PE0.
	402	IF ( ind(1) /= -9999 ) THEN
	403	tmp_array(:mask_size_l(mid,1)) = mask_i(mid,:mask_size_l(mid,1))
	404	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,1), &
[363]	405	MPI_INTEGER, 0, 1, comm2d, ierr )
[298]	406	tmp_array(:mask_size_l(mid,2)) = mask_j(mid,:mask_size_l(mid,2))
	407	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,2), &
[363]	408	MPI_INTEGER, 0, 2, comm2d, ierr )
[298]	409	tmp_array(:mask_size_l(mid,3)) = mask_k(mid,:mask_size_l(mid,3))
	410	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,3), &
[363]	411	MPI_INTEGER, 0, 3, comm2d, ierr )
[298]	412	ENDIF
	413	ENDIF
	414	!
	415	!-- A barrier has to be set, because otherwise some PEs may proceed too fast
	416	!-- so that PE0 may receive wrong data on tag 0.
	417	CALL MPI_BARRIER( comm2d, ierr )
[409]	418
[493]	419	IF ( netcdf_data_format > 2 ) THEN
[409]	420
[493]	421	CALL MPI_BCAST( mask_i_global(mid,:), nx+1, MPI_INTEGER, 0, comm2d, &
	422	ierr )
	423	CALL MPI_BCAST( mask_j_global(mid,:), ny+1, MPI_INTEGER, 0, comm2d, &
	424	ierr )
	425	CALL MPI_BCAST( mask_k_global(mid,:), nz+1, MPI_INTEGER, 0, comm2d, &
	426	ierr )
[409]	427
	428	ENDIF
[298]	429
	430	#else
	431	!
	432	!-- Local arrays can be relocated directly.
	433	mask_i_global(mid,:) = mask_i(mid,:)
	434	mask_j_global(mid,:) = mask_j(mid,:)
	435	mask_k_global(mid,:) = mask_k(mid,:)
	436	#endif
	437	ENDDO ! mid
	438
	439	DEALLOCATE( tmp_array )
	440	!
	441	!-- Internal mask arrays cannot be deallocated on PE 0 because they are
	442	!-- required for header output on PE 0.
	443	IF ( myid /= 0 ) DEALLOCATE( mask, mask_loop )
	444
	445	CONTAINS
[493]	446
[298]	447	SUBROUTINE set_mask_locations( dim, dxyz, dxyz_string, nxyz, nxyz_string, &
	448	lb, ub )
	449	!------------------------------------------------------------------------------!
	450	!
	451	! Description:
	452	! ------------
	453	! Set local mask for each subdomain along 'dim' direction.
	454	!------------------------------------------------------------------------------!
	455
	456	IMPLICIT NONE
	457
	458	CHARACTER (LEN=2) :: dxyz_string, nxyz_string
	459	INTEGER :: count, count_l, dim, m, loop_begin, loop_end, loop_stride, &
	460	lb, nxyz, ub
	461	REAL :: dxyz, ddxyz, tmp1, tmp2
	462
	463	count = 0; count_l = 0; ddxyz = 1.0 / dxyz; tmp1 = 0.0; tmp2 = 0.0
	464
	465	IF ( mask(mid,dim,1) >= 0.0 ) THEN
	466	!
	467	!-- use predefined mask_* array
	468	DO WHILE ( mask(mid,dim,count+1) >= 0.0 )
	469	count = count + 1
	470	IF ( dim == 1 .OR. dim == 2 ) THEN
[303]	471	m = NINT( mask(mid,dim,count) * mask_scale(dim) * ddxyz )
[298]	472	ELSEIF ( dim == 3 ) THEN
	473	ind_array = &
[595]	474	MINLOC( ABS( mask(mid,dim,count) * mask_scale(dim) - zu ) )
[298]	475	m = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	476	ENDIF
	477	IF ( m > nxyz ) THEN
[303]	478	WRITE ( message_string, '(I3,A,I3,A,I1,3A,I3)' ) &
	479	m,' in mask ',mid,' along dimension ',dim, &
	480	' exceeds ',nxyz_string,' = ',nxyz
[564]	481	CALL message( 'init_masks', 'PA0331', 1, 2, 0, 6, 0 )
[298]	482	ENDIF
	483	IF ( m >= lb .AND. m <= ub ) THEN
	484	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
	485	count_l = count_l + 1
	486	IF ( dim == 1 ) THEN
	487	mask_i(mid,count_l) = m
	488	ELSEIF ( dim == 2 ) THEN
	489	mask_j(mid,count_l) = m
	490	ELSEIF ( dim == 3 ) THEN
	491	mask_k(mid,count_l) = m
	492	ENDIF
	493	ENDIF
	494	IF ( count == mask_xyz_dimension ) EXIT
	495	ENDDO
	496	mask_size(mid,dim) = count
	497	mask_size_l(mid,dim) = count_l
	498
	499	ELSE
	500	!
	501	!-- use predefined mask_loop_* array, or use the default (all grid points
	502	!-- along this direction)
	503	IF ( mask_loop(mid,dim,1) < 0.0 ) THEN
	504	tmp1 = mask_loop(mid,dim,1)
	505	mask_loop(mid,dim,1) = 0.0 ! (default)
	506	ENDIF
	507	IF ( dim == 1 .OR. dim == 2 ) THEN
	508	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
	509	tmp2 = mask_loop(mid,dim,2)
[303]	510	mask_loop(mid,dim,2) = nxyz*dxyz / mask_scale(dim) ! (default)
[298]	511	ENDIF
	512	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
[303]	513	> nxyz * dxyz / mask_scale(dim) ) THEN
	514	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),5A,I1,A,F9.3)' ) &
	515	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
	516	' and/or mask_loop(',mid,',',dim,',2)=', &
	517	mask_loop(mid,dim,2),'&exceed ', &
	518	nxyz_string,'*',dxyz_string,'/mask_scale(',dim,')=', &
	519	nxyz*dxyz/mask_scale(dim)
[564]	520	CALL message( 'init_masks', 'PA0332', 1, 2, 0, 6, 0 )
[298]	521	ENDIF
[303]	522	loop_begin = NINT( mask_loop(mid,dim,1) * mask_scale(dim) * ddxyz )
	523	loop_end = NINT( mask_loop(mid,dim,2) * mask_scale(dim) * ddxyz )
	524	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
[298]	525	ELSEIF ( dim == 3 ) THEN
	526	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
	527	tmp2 = mask_loop(mid,dim,2)
[595]	528	mask_loop(mid,dim,2) = zu(nz) / mask_scale(dim) ! (default)
[298]	529	ENDIF
	530	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
[595]	531	> zu(nz) / mask_scale(dim) ) THEN
[303]	532	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),A,I1,A,F9.3)' ) &
	533	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
	534	' and/or mask_loop(',mid,',',dim,',2)=', &
[595]	535	mask_loop(mid,dim,2),'&exceed zu(nz)/mask_scale(',dim, &
	536	')=',zu(nz)/mask_scale(dim)
[564]	537	CALL message( 'init_masks', 'PA0333', 1, 2, 0, 6, 0 )
[298]	538	ENDIF
[303]	539	ind_array = &
[595]	540	MINLOC( ABS( mask_loop(mid,dim,1) * mask_scale(dim) - zu ) )
[298]	541	loop_begin = &
[303]	542	ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	543	ind_array = &
[595]	544	MINLOC( ABS( mask_loop(mid,dim,2) * mask_scale(dim) - zu ) )
[298]	545	loop_end = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	546	!
[303]	547	!-- The following line assumes a constant vertical grid spacing within
	548	!-- the vertical mask range; it fails for vertical grid stretching.
	549	!-- Maybe revise later. Issue warning but continue execution.
	550	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
	551
	552	IF ( mask_loop(mid,dim,2) * mask_scale(dim) > dz_stretch_level ) &
	553	THEN
[557]	554	WRITE ( message_string, '(A,I3,A,I1,A,F9.3,A,F8.2,3A)' ) &
	555	'mask_loop(',mid,',',dim,',2)=', mask_loop(mid,dim,2),&
[303]	556	' exceeds dz_stretch_level=',dz_stretch_level, &
	557	'.&Vertical mask locations will not ', &
	558	'match the desired heights&within the stretching ', &
	559	'region. Recommendation: use mask instead of mask_loop.'
[564]	560	CALL message( 'init_masks', 'PA0334', 0, 1, 0, 6, 0 )
[303]	561	ENDIF
	562
[298]	563	ENDIF
	564	!
	565	!-- If necessary, reset mask_loop(mid,dim,1) and mask_loop(mid,dim,2).
	566	IF ( tmp1 < 0.0 ) mask_loop(mid,dim,1) = tmp1
	567	IF ( tmp2 < 0.0 ) mask_loop(mid,dim,2) = tmp2
	568	!
	569	!-- The default stride +/-1 (every grid point) applies if
	570	!-- mask_loop(mid,dim,3) is not specified (its default is zero).
	571	IF ( loop_stride == 0 ) THEN
	572	IF ( loop_end >= loop_begin ) THEN
	573	loop_stride = 1
	574	ELSE
	575	loop_stride = -1
	576	ENDIF
	577	ENDIF
	578	DO m = loop_begin, loop_end, loop_stride
	579	count = count + 1
	580	IF ( m >= lb .AND. m <= ub ) THEN
	581	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
	582	count_l = count_l + 1
	583	IF ( dim == 1 ) THEN
	584	mask_i(mid,count_l) = m
	585	ELSEIF ( dim == 2 ) THEN
	586	mask_j(mid,count_l) = m
	587	ELSEIF ( dim == 3 ) THEN
	588	mask_k(mid,count_l) = m
	589	ENDIF
	590	ENDIF
	591	ENDDO
	592	mask_size(mid,dim) = count
	593	mask_size_l(mid,dim) = count_l
	594	ENDIF
	595
	596	END SUBROUTINE set_mask_locations
	597
	598	END SUBROUTINE init_masks

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