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source: palm/trunk/SOURCE/init_masks.f90 @ 991

Last change on this file since 991 was 979, checked in by fricke, 12 years ago
last commit documented
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File size: 24.7 KB

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[298]	1	SUBROUTINE init_masks
	2
	3	!------------------------------------------------------------------------------!
[484]	4	! Current revisions:
[298]	5	! -----------------
	6	!
[979]	7	!
[298]	8	! Former revisions:
	9	! -----------------
	10	! $Id: init_masks.f90 979 2012-08-09 08:50:11Z heinze $
	11	!
[979]	12	! 978 2012-08-09 08:28:32Z fricke
	13	! +z0h*
	14	!
[810]	15	! 809 2012-01-30 13:32:58Z maronga
	16	! Bugfix: replaced .AND. and .NOT. with && and ! in the preprocessor directives
	17	!
[808]	18	! 807 2012-01-25 11:53:51Z maronga
	19	! New cpp directive "__check" implemented which is used by check_namelist_files
	20	!
[772]	21	! 771 2011-10-27 10:56:21Z heinze
	22	! +lpt
	23	!
[596]	24	! 595 2010-11-12 09:52:10Z helmke
	25	! Calculation of z locations for masked output changed
	26	!
[565]	27	! 564 2010-09-30 13:18:59Z helmke
	28	! assignment of mask_xyz_loop added, palm message identifiers of masked output
	29	! changed
	30	!
[558]	31	! 557 2010-09-07 14:50:07Z weinreis
	32	! bugfix message string in set_mask_locations
	33	!
[554]	34	! 553 2010-09-01 14:09:06Z weinreis
	35	! parameters for masked output are replaced by arrays
	36	!
[494]	37	! 493 2010-03-01 08:30:24Z raasch
	38	! netcdf_format_mask* and format_parallel_io replaced by netcdf_data_format
	39	!
[449]	40	! 410 2009-12-04 17:05:40Z letzel
	41	! Initial revision
[298]	42	!
[449]	43	!
[298]	44	! Description:
	45	! ------------
	46	! Initialize masked data output
	47	!------------------------------------------------------------------------------!
	48
	49	USE arrays_3d
	50	USE control_parameters
	51	USE grid_variables
	52	USE indices
	53	USE netcdf_control
	54	USE particle_attributes
	55	USE pegrid
	56
	57	IMPLICIT NONE
	58
	59	CHARACTER (LEN=6) :: var
	60	CHARACTER (LEN=7) :: unit
	61	CHARACTER (LEN=10), DIMENSION(max_masks,100) :: do_mask, do_mask_user
	62
	63	INTEGER :: i, ilen, ind(6), ind_array(1), j, k, n, sender
	64	INTEGER, DIMENSION(:), ALLOCATABLE :: tmp_array
	65
	66	LOGICAL :: found
	67	!
	68	!-- Allocation and initialization
	69	ALLOCATE( tmp_array( MAX(nx,ny,nz)+1 ) )
	70
	71	ALLOCATE( mask_i(max_masks,nxr-nxl+1), &
	72	mask_j(max_masks,nyn-nys+1), &
	73	mask_k(max_masks,nzt-nzb+1) )
	74	!
	75	!-- internal mask arrays ("mask,dimension,selection")
	76	ALLOCATE( mask(max_masks,3,mask_xyz_dimension), &
	77	mask_loop(max_masks,3,3) )
[493]	78
[298]	79	!
[493]	80	!-- Parallel mask output not yet tested
	81	IF ( netcdf_data_format > 2 ) THEN
	82	message_string = 'NetCDF file formats '// &
	83	'3 (NetCDF 4) and 4 (NetCDF 4 Classic model)'// &
	84	'&are currently not supported (not yet tested).'
[564]	85	CALL message( 'init_masks', 'PA0328', 1, 2, 0, 6, 0 )
[298]	86	ENDIF
[553]	87
[298]	88	!
	89	!-- Store data output parameters for masked data output in few shared arrays
[553]	90	DO mid = 1, masks
[564]	91
[553]	92	do_mask (mid,:) = data_output_masks(mid,:)
	93	do_mask_user(mid,:) = data_output_masks_user(mid,:)
	94	mask (mid,1,:) = mask_x(mid,:)
	95	mask (mid,2,:) = mask_y(mid,:)
	96	mask (mid,3,:) = mask_z(mid,:)
[564]	97
	98	IF ( mask_x_loop(mid,1) == -1.0 .AND. mask_x_loop(mid,2) == -1.0 &
	99	.AND. mask_x_loop(mid,3) == -1.0 ) THEN
	100	mask_loop(mid,1,1:2) = -1.0
	101	mask_loop(mid,1,3) = 0.0
	102	ELSE
	103	mask_loop(mid,1,:) = mask_x_loop(mid,:)
	104	ENDIF
	105	IF ( mask_y_loop(mid,1) == -1.0 .AND. mask_y_loop(mid,2) == -1.0 &
	106	.AND. mask_y_loop(mid,3) == -1.0 ) THEN
	107	mask_loop(mid,2,1:2) = -1.0
	108	mask_loop(mid,2,3) = 0.0
	109	ELSE
	110	mask_loop(mid,2,:) = mask_y_loop(mid,:)
	111	ENDIF
	112	IF ( mask_z_loop(mid,1) == -1.0 .AND. mask_z_loop(mid,2) == -1.0 &
	113	.AND. mask_z_loop(mid,3) == -1.0 ) THEN
	114	mask_loop(mid,3,1:2) = -1.0
	115	mask_loop(mid,3,3) = 0.0
	116	ELSE
	117	mask_loop(mid,3,:) = mask_z_loop(mid,:)
	118	ENDIF
	119
[553]	120	ENDDO
	121
[298]	122	mask_i = -1; mask_j = -1; mask_k = -1
[553]	123
[298]	124	!
	125	!-- Global arrays are required by define_netcdf_header.
[493]	126	IF ( myid == 0 .OR. netcdf_data_format > 2 ) THEN
[298]	127	ALLOCATE( mask_i_global(max_masks,nx+1), &
	128	mask_j_global(max_masks,ny+1), &
	129	mask_k_global(max_masks,nz+1) )
	130	mask_i_global = -1; mask_j_global = -1; mask_k_global = -1
	131	ENDIF
	132
	133	!
	134	!-- Determine variable names for each mask
	135	DO mid = 1, masks
	136	!
	137	!-- Append user-defined data output variables to the standard data output
	138	IF ( do_mask_user(mid,1) /= ' ' ) THEN
	139	i = 1
	140	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
	141	i = i + 1
	142	ENDDO
	143	j = 1
	144	DO WHILE ( do_mask_user(mid,j) /= ' ' .AND. j <= 100 )
	145	IF ( i > 100 ) THEN
	146	WRITE ( message_string, * ) 'number of output quantitities ', &
	147	'given by data_output_mask and data_output_mask_user ', &
	148	'exceeds the limit of 100'
[564]	149	CALL message( 'init_masks', 'PA0329', 1, 2, 0, 6, 0 )
[298]	150	ENDIF
	151	do_mask(mid,i) = do_mask_user(mid,j)
	152	i = i + 1
	153	j = j + 1
	154	ENDDO
	155	ENDIF
	156
	157	!
	158	!-- Check and set steering parameters for mask data output and averaging
	159	i = 1
	160	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
	161	!
	162	!-- Check for data averaging
	163	ilen = LEN_TRIM( do_mask(mid,i) )
	164	j = 0 ! no data averaging
	165	IF ( ilen > 3 ) THEN
	166	IF ( do_mask(mid,i)(ilen-2:ilen) == '_av' ) THEN
	167	j = 1 ! data averaging
	168	do_mask(mid,i) = do_mask(mid,i)(1:ilen-3)
	169	ENDIF
	170	ENDIF
	171	var = TRIM( do_mask(mid,i) )
	172	!
	173	!-- Check for allowed value and set units
	174	SELECT CASE ( TRIM( var ) )
	175
	176	CASE ( 'e' )
	177	IF ( constant_diffusion ) THEN
	178	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	179	'" requires constant_diffusion = .FALSE.'
[564]	180	CALL message( 'init_masks', 'PA0103', 1, 2, 0, 6, 0 )
[298]	181	ENDIF
	182	unit = 'm2/s2'
	183
[771]	184	CASE ( 'lpt' )
	185	IF ( .NOT. cloud_physics ) THEN
	186	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	187	'" requires cloud_physics = .TRUE.'
[773]	188	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[771]	189	ENDIF
	190	unit = 'K'
	191
[298]	192	CASE ( 'pc', 'pr' )
	193	IF ( .NOT. particle_advection ) THEN
	194	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	195	'" requires a "particles_par"-NAMELIST in the ', &
	196	'parameter file (PARIN)'
[564]	197	CALL message( 'init_masks', 'PA0104', 1, 2, 0, 6, 0 )
[298]	198	ENDIF
	199	IF ( TRIM( var ) == 'pc' ) unit = 'number'
	200	IF ( TRIM( var ) == 'pr' ) unit = 'm'
	201
	202	CASE ( 'q', 'vpt' )
	203	IF ( .NOT. humidity ) THEN
	204	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	205	'" requires humidity = .TRUE.'
[564]	206	CALL message( 'init_masks', 'PA0105', 1, 2, 0, 6, 0 )
[298]	207	ENDIF
	208	IF ( TRIM( var ) == 'q' ) unit = 'kg/kg'
	209	IF ( TRIM( var ) == 'vpt' ) unit = 'K'
	210
	211	CASE ( 'ql' )
	212	IF ( .NOT. ( cloud_physics .OR. cloud_droplets ) ) THEN
	213	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	214	'" requires cloud_physics = .TRUE. or cloud_droplets', &
	215	' = .TRUE.'
[564]	216	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	217	ENDIF
	218	unit = 'kg/kg'
	219
	220	CASE ( 'ql_c', 'ql_v', 'ql_vp' )
	221	IF ( .NOT. cloud_droplets ) THEN
	222	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	223	'" requires cloud_droplets = .TRUE.'
[564]	224	CALL message( 'init_masks', 'PA0107', 1, 2, 0, 6, 0 )
[298]	225	ENDIF
	226	IF ( TRIM( var ) == 'ql_c' ) unit = 'kg/kg'
	227	IF ( TRIM( var ) == 'ql_v' ) unit = 'm3'
	228	IF ( TRIM( var ) == 'ql_vp' ) unit = 'none'
	229
	230	CASE ( 'qv' )
	231	IF ( .NOT. cloud_physics ) THEN
	232	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	233	'" requires cloud_physics = .TRUE.'
[564]	234	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	235	ENDIF
	236	unit = 'kg/kg'
	237
	238	CASE ( 'rho' )
	239	IF ( .NOT. ocean ) THEN
	240	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	241	'" requires ocean = .TRUE.'
[564]	242	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
[298]	243	ENDIF
	244	unit = 'kg/m3'
	245
	246	CASE ( 's' )
	247	IF ( .NOT. passive_scalar ) THEN
	248	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	249	'" requires passive_scalar = .TRUE.'
[564]	250	CALL message( 'init_masks', 'PA0110', 1, 2, 0, 6, 0 )
[298]	251	ENDIF
	252	unit = 'conc'
	253
	254	CASE ( 'sa' )
	255	IF ( .NOT. ocean ) THEN
	256	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	257	'" requires ocean = .TRUE.'
[564]	258	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
[298]	259	ENDIF
	260	unit = 'psu'
	261
[978]	262	CASE ( 'u', 't', 'lwp', 'pra', 'prr', 'z0', 'z0h*' )
[298]	263	WRITE ( message_string, * ) 'illegal value for data_',&
	264	'output: "', TRIM( var ), '" is only allowed', &
	265	'for horizontal cross section'
[564]	266	CALL message( 'init_masks', 'PA0111', 1, 2, 0, 6, 0 )
[298]	267	! IF ( TRIM( var ) == 'lwp*' .AND. .NOT. cloud_physics ) THEN
	268	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	269	! '" requires cloud_physics = .TRUE.'
[564]	270	! CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
[298]	271	! ENDIF
	272	! IF ( TRIM( var ) == 'pra*' .AND. .NOT. precipitation ) THEN
	273	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	274	! '" requires precipitation = .TRUE.'
[564]	275	! CALL message( 'init_masks', 'PA0112', 1, 2, 0, 6, 0 )
[298]	276	! ENDIF
	277	! IF ( TRIM( var ) == 'pra*' .AND. j == 1 ) THEN
	278	! WRITE ( message_string, * ) 'temporal averaging of ', &
	279	! ' precipitation amount "', TRIM( var ), &
	280	! '" not possible'
[564]	281	! CALL message( 'init_masks', 'PA0113', 1, 2, 0, 6, 0 )
[298]	282	! ENDIF
	283	! IF ( TRIM( var ) == 'prr*' .AND. .NOT. precipitation ) THEN
	284	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
	285	! '" requires precipitation = .TRUE.'
[564]	286	! CALL message( 'init_masks', 'PA0112', 1, 2, 0, 6, 0 )
[298]	287	! ENDIF
	288	!
	289	! IF ( TRIM( var ) == 'u*' ) unit = 'm/s'
	290	! IF ( TRIM( var ) == 't*' ) unit = 'K'
	291	! IF ( TRIM( var ) == 'lwp' ) unit = 'kg/kgm'
	292	! IF ( TRIM( var ) == 'pra*' ) unit = 'mm'
	293	! IF ( TRIM( var ) == 'prr*' ) unit = 'mm/s'
	294	! IF ( TRIM( var ) == 'z0*' ) unit = 'm'
	295
	296	CASE ( 'p', 'pt', 'u', 'v', 'w' )
	297	IF ( TRIM( var ) == 'p' ) unit = 'Pa'
	298	IF ( TRIM( var ) == 'pt' ) unit = 'K'
	299	IF ( TRIM( var ) == 'u' ) unit = 'm/s'
	300	IF ( TRIM( var ) == 'v' ) unit = 'm/s'
	301	IF ( TRIM( var ) == 'w' ) unit = 'm/s'
	302	CONTINUE
	303
	304	CASE DEFAULT
	305	CALL user_check_data_output( var, unit )
	306
	307	IF ( unit == 'illegal' ) THEN
	308	IF ( do_mask_user(mid,1) /= ' ' ) THEN
	309	WRITE ( message_string, * ) 'illegal value for data_',&
	310	'output or data_output_user: "', &
	311	TRIM( do_mask(mid,i) ), '"'
[564]	312	CALL message( 'init_masks', 'PA0114', 1, 2, 0, 6, 0 )
[298]	313	ELSE
	314	WRITE ( message_string, * ) 'illegal value for data_',&
	315	'output: "', TRIM( do_mask(mid,i) ), '"'
[564]	316	CALL message( 'init_masks', 'PA0330', 1, 2, 0, 6, 0 )
[298]	317	ENDIF
	318	ENDIF
	319
	320	END SELECT
	321	!
	322	!-- Set the internal steering parameters appropriately
	323	domask_no(mid,j) = domask_no(mid,j) + 1
	324	domask(mid,j,domask_no(mid,j)) = do_mask(mid,i)
	325	domask_unit(mid,j,domask_no(mid,j)) = unit
	326
	327	IF ( j == 1 ) THEN
	328	!
	329	!-- Check, if variable is already subject to averaging
	330	found = .FALSE.
	331	DO k = 1, doav_n
	332	IF ( TRIM( doav(k) ) == TRIM( var ) ) found = .TRUE.
	333	ENDDO
	334
	335	IF ( .NOT. found ) THEN
	336	doav_n = doav_n + 1
	337	doav(doav_n) = var
	338	ENDIF
	339	ENDIF
	340
	341	i = i + 1
	342
	343	ENDDO ! do_mask(mid,i)
	344	ENDDO ! mid
	345
	346
	347	!
	348	!-- Determine mask locations for each mask
	349	DO mid = 1, masks
	350	!
	351	!-- Set local masks for each subdomain along all three dimensions
	352	CALL set_mask_locations( 1, dx, 'dx', nx, 'nx', nxl, nxr )
	353	CALL set_mask_locations( 2, dy, 'dy', ny, 'ny', nys, nyn )
	354	CALL set_mask_locations( 3, dz, 'dz', nz, 'nz', nzb, nzt )
	355	!
	356	!-- Set global masks along all three dimensions (required by
	357	!-- define_netcdf_header).
[809]	358	#if defined( __parallel ) && ! defined ( __check )
[298]	359	!
	360	!-- PE0 receives partial arrays from all processors of the respective mask
	361	!-- and outputs them. Here a barrier has to be set, because otherwise
	362	!-- "-MPI- FATAL: Remote protocol queue full" may occur.
[807]	363
[298]	364	CALL MPI_BARRIER( comm2d, ierr )
	365
	366	IF ( myid == 0 ) THEN
	367	!
	368	!-- Local arrays can be relocated directly.
	369	mask_i_global(mid,mask_start_l(mid,1): &
	370	mask_start_l(mid,1)+mask_size_l(mid,1)-1) = &
	371	mask_i(mid,:mask_size_l(mid,1))
	372	mask_j_global(mid,mask_start_l(mid,2): &
	373	mask_start_l(mid,2)+mask_size_l(mid,2)-1) = &
	374	mask_j(mid,:mask_size_l(mid,2))
	375	mask_k_global(mid,mask_start_l(mid,3): &
	376	mask_start_l(mid,3)+mask_size_l(mid,3)-1) = &
	377	mask_k(mid,:mask_size_l(mid,3))
	378	!
	379	!-- Receive data from all other PEs.
	380	DO n = 1, numprocs-1
	381	!
	382	!-- Receive index limits first, then arrays.
	383	!-- Index limits are received in arbitrary order from the PEs.
	384	CALL MPI_RECV( ind(1), 6, MPI_INTEGER, MPI_ANY_SOURCE, 0, &
	385	comm2d, status, ierr )
	386	!
	387	!-- Not all PEs have data for the mask.
	388	IF ( ind(1) /= -9999 ) THEN
	389	sender = status(MPI_SOURCE)
	390	CALL MPI_RECV( tmp_array(ind(1)), ind(2)-ind(1)+1, &
[363]	391	MPI_INTEGER, sender, 1, comm2d, status, ierr )
[298]	392	mask_i_global(mid,ind(1):ind(2)) = tmp_array(ind(1):ind(2))
	393	CALL MPI_RECV( tmp_array(ind(3)), ind(4)-ind(3)+1, &
[363]	394	MPI_INTEGER, sender, 2, comm2d, status, ierr )
[298]	395	mask_j_global(mid,ind(3):ind(4)) = tmp_array(ind(3):ind(4))
	396	CALL MPI_RECV( tmp_array(ind(5)), ind(6)-ind(5)+1, &
[363]	397	MPI_INTEGER, sender, 3, comm2d, status, ierr )
[298]	398	mask_k_global(mid,ind(5):ind(6)) = tmp_array(ind(5):ind(6))
	399	ENDIF
	400	ENDDO
	401
	402	ELSE
	403	!
	404	!-- If at least part of the mask resides on the PE, send the index limits
	405	!-- for the target array, otherwise send -9999 to PE0.
	406	IF ( mask_size_l(mid,1) > 0 .AND. mask_size_l(mid,2) > 0 .AND. &
	407	mask_size_l(mid,3) > 0 ) &
	408	THEN
	409	ind(1) = mask_start_l(mid,1)
	410	ind(2) = mask_start_l(mid,1) + mask_size_l(mid,1) - 1
	411	ind(3) = mask_start_l(mid,2)
	412	ind(4) = mask_start_l(mid,2) + mask_size_l(mid,2) - 1
	413	ind(5) = mask_start_l(mid,3)
	414	ind(6) = mask_start_l(mid,3) + mask_size_l(mid,3) - 1
	415	ELSE
	416	ind(1) = -9999; ind(2) = -9999
	417	ind(3) = -9999; ind(4) = -9999
	418	ind(5) = -9999; ind(6) = -9999
	419	ENDIF
	420	CALL MPI_SEND( ind(1), 6, MPI_INTEGER, 0, 0, comm2d, ierr )
	421	!
	422	!-- If applicable, send data to PE0.
	423	IF ( ind(1) /= -9999 ) THEN
	424	tmp_array(:mask_size_l(mid,1)) = mask_i(mid,:mask_size_l(mid,1))
	425	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,1), &
[363]	426	MPI_INTEGER, 0, 1, comm2d, ierr )
[298]	427	tmp_array(:mask_size_l(mid,2)) = mask_j(mid,:mask_size_l(mid,2))
	428	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,2), &
[363]	429	MPI_INTEGER, 0, 2, comm2d, ierr )
[298]	430	tmp_array(:mask_size_l(mid,3)) = mask_k(mid,:mask_size_l(mid,3))
	431	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,3), &
[363]	432	MPI_INTEGER, 0, 3, comm2d, ierr )
[298]	433	ENDIF
	434	ENDIF
	435	!
	436	!-- A barrier has to be set, because otherwise some PEs may proceed too fast
	437	!-- so that PE0 may receive wrong data on tag 0.
	438	CALL MPI_BARRIER( comm2d, ierr )
[409]	439
[493]	440	IF ( netcdf_data_format > 2 ) THEN
[409]	441
[493]	442	CALL MPI_BCAST( mask_i_global(mid,:), nx+1, MPI_INTEGER, 0, comm2d, &
	443	ierr )
	444	CALL MPI_BCAST( mask_j_global(mid,:), ny+1, MPI_INTEGER, 0, comm2d, &
	445	ierr )
	446	CALL MPI_BCAST( mask_k_global(mid,:), nz+1, MPI_INTEGER, 0, comm2d, &
	447	ierr )
[409]	448
	449	ENDIF
[298]	450
[809]	451	#elif ! defined ( __parallel )
[298]	452	!
	453	!-- Local arrays can be relocated directly.
	454	mask_i_global(mid,:) = mask_i(mid,:)
	455	mask_j_global(mid,:) = mask_j(mid,:)
	456	mask_k_global(mid,:) = mask_k(mid,:)
	457	#endif
	458	ENDDO ! mid
	459
	460	DEALLOCATE( tmp_array )
	461	!
	462	!-- Internal mask arrays cannot be deallocated on PE 0 because they are
	463	!-- required for header output on PE 0.
	464	IF ( myid /= 0 ) DEALLOCATE( mask, mask_loop )
	465
	466	CONTAINS
[493]	467
[298]	468	SUBROUTINE set_mask_locations( dim, dxyz, dxyz_string, nxyz, nxyz_string, &
	469	lb, ub )
	470	!------------------------------------------------------------------------------!
	471	!
	472	! Description:
	473	! ------------
	474	! Set local mask for each subdomain along 'dim' direction.
	475	!------------------------------------------------------------------------------!
	476
	477	IMPLICIT NONE
	478
	479	CHARACTER (LEN=2) :: dxyz_string, nxyz_string
	480	INTEGER :: count, count_l, dim, m, loop_begin, loop_end, loop_stride, &
	481	lb, nxyz, ub
	482	REAL :: dxyz, ddxyz, tmp1, tmp2
	483
	484	count = 0; count_l = 0; ddxyz = 1.0 / dxyz; tmp1 = 0.0; tmp2 = 0.0
	485
	486	IF ( mask(mid,dim,1) >= 0.0 ) THEN
	487	!
	488	!-- use predefined mask_* array
	489	DO WHILE ( mask(mid,dim,count+1) >= 0.0 )
	490	count = count + 1
	491	IF ( dim == 1 .OR. dim == 2 ) THEN
[303]	492	m = NINT( mask(mid,dim,count) * mask_scale(dim) * ddxyz )
[298]	493	ELSEIF ( dim == 3 ) THEN
	494	ind_array = &
[595]	495	MINLOC( ABS( mask(mid,dim,count) * mask_scale(dim) - zu ) )
[298]	496	m = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	497	ENDIF
	498	IF ( m > nxyz ) THEN
[303]	499	WRITE ( message_string, '(I3,A,I3,A,I1,3A,I3)' ) &
	500	m,' in mask ',mid,' along dimension ',dim, &
	501	' exceeds ',nxyz_string,' = ',nxyz
[564]	502	CALL message( 'init_masks', 'PA0331', 1, 2, 0, 6, 0 )
[298]	503	ENDIF
	504	IF ( m >= lb .AND. m <= ub ) THEN
	505	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
	506	count_l = count_l + 1
	507	IF ( dim == 1 ) THEN
	508	mask_i(mid,count_l) = m
	509	ELSEIF ( dim == 2 ) THEN
	510	mask_j(mid,count_l) = m
	511	ELSEIF ( dim == 3 ) THEN
	512	mask_k(mid,count_l) = m
	513	ENDIF
	514	ENDIF
	515	IF ( count == mask_xyz_dimension ) EXIT
	516	ENDDO
	517	mask_size(mid,dim) = count
	518	mask_size_l(mid,dim) = count_l
	519
	520	ELSE
	521	!
	522	!-- use predefined mask_loop_* array, or use the default (all grid points
	523	!-- along this direction)
	524	IF ( mask_loop(mid,dim,1) < 0.0 ) THEN
	525	tmp1 = mask_loop(mid,dim,1)
	526	mask_loop(mid,dim,1) = 0.0 ! (default)
	527	ENDIF
	528	IF ( dim == 1 .OR. dim == 2 ) THEN
	529	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
	530	tmp2 = mask_loop(mid,dim,2)
[303]	531	mask_loop(mid,dim,2) = nxyz*dxyz / mask_scale(dim) ! (default)
[298]	532	ENDIF
	533	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
[303]	534	> nxyz * dxyz / mask_scale(dim) ) THEN
	535	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),5A,I1,A,F9.3)' ) &
	536	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
	537	' and/or mask_loop(',mid,',',dim,',2)=', &
	538	mask_loop(mid,dim,2),'&exceed ', &
	539	nxyz_string,'*',dxyz_string,'/mask_scale(',dim,')=', &
	540	nxyz*dxyz/mask_scale(dim)
[564]	541	CALL message( 'init_masks', 'PA0332', 1, 2, 0, 6, 0 )
[298]	542	ENDIF
[303]	543	loop_begin = NINT( mask_loop(mid,dim,1) * mask_scale(dim) * ddxyz )
	544	loop_end = NINT( mask_loop(mid,dim,2) * mask_scale(dim) * ddxyz )
	545	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
[298]	546	ELSEIF ( dim == 3 ) THEN
	547	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
	548	tmp2 = mask_loop(mid,dim,2)
[595]	549	mask_loop(mid,dim,2) = zu(nz) / mask_scale(dim) ! (default)
[298]	550	ENDIF
	551	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
[595]	552	> zu(nz) / mask_scale(dim) ) THEN
[303]	553	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),A,I1,A,F9.3)' ) &
	554	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
	555	' and/or mask_loop(',mid,',',dim,',2)=', &
[595]	556	mask_loop(mid,dim,2),'&exceed zu(nz)/mask_scale(',dim, &
	557	')=',zu(nz)/mask_scale(dim)
[564]	558	CALL message( 'init_masks', 'PA0333', 1, 2, 0, 6, 0 )
[298]	559	ENDIF
[303]	560	ind_array = &
[595]	561	MINLOC( ABS( mask_loop(mid,dim,1) * mask_scale(dim) - zu ) )
[298]	562	loop_begin = &
[303]	563	ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	564	ind_array = &
[595]	565	MINLOC( ABS( mask_loop(mid,dim,2) * mask_scale(dim) - zu ) )
[298]	566	loop_end = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
	567	!
[303]	568	!-- The following line assumes a constant vertical grid spacing within
	569	!-- the vertical mask range; it fails for vertical grid stretching.
	570	!-- Maybe revise later. Issue warning but continue execution.
	571	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
	572
	573	IF ( mask_loop(mid,dim,2) * mask_scale(dim) > dz_stretch_level ) &
	574	THEN
[557]	575	WRITE ( message_string, '(A,I3,A,I1,A,F9.3,A,F8.2,3A)' ) &
	576	'mask_loop(',mid,',',dim,',2)=', mask_loop(mid,dim,2),&
[303]	577	' exceeds dz_stretch_level=',dz_stretch_level, &
	578	'.&Vertical mask locations will not ', &
	579	'match the desired heights&within the stretching ', &
	580	'region. Recommendation: use mask instead of mask_loop.'
[564]	581	CALL message( 'init_masks', 'PA0334', 0, 1, 0, 6, 0 )
[303]	582	ENDIF
	583
[298]	584	ENDIF
	585	!
	586	!-- If necessary, reset mask_loop(mid,dim,1) and mask_loop(mid,dim,2).
	587	IF ( tmp1 < 0.0 ) mask_loop(mid,dim,1) = tmp1
	588	IF ( tmp2 < 0.0 ) mask_loop(mid,dim,2) = tmp2
	589	!
	590	!-- The default stride +/-1 (every grid point) applies if
	591	!-- mask_loop(mid,dim,3) is not specified (its default is zero).
	592	IF ( loop_stride == 0 ) THEN
	593	IF ( loop_end >= loop_begin ) THEN
	594	loop_stride = 1
	595	ELSE
	596	loop_stride = -1
	597	ENDIF
	598	ENDIF
	599	DO m = loop_begin, loop_end, loop_stride
	600	count = count + 1
	601	IF ( m >= lb .AND. m <= ub ) THEN
	602	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
	603	count_l = count_l + 1
	604	IF ( dim == 1 ) THEN
	605	mask_i(mid,count_l) = m
	606	ELSEIF ( dim == 2 ) THEN
	607	mask_j(mid,count_l) = m
	608	ELSEIF ( dim == 3 ) THEN
	609	mask_k(mid,count_l) = m
	610	ENDIF
	611	ENDIF
	612	ENDDO
	613	mask_size(mid,dim) = count
	614	mask_size_l(mid,dim) = count_l
	615	ENDIF
	616
	617	END SUBROUTINE set_mask_locations
	618
	619	END SUBROUTINE init_masks

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