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source: palm/trunk/SOURCE/init_masks.f90 @ 553

Last change on this file since 553 was 553, checked in by weinreis, 14 years ago
several parameters for masked output are replaced by arrays
Property svn:keywords set to `Id`
File size: 23.0 KB

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1	SUBROUTINE init_masks
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	! parameters for masked output are replaced by arrays
7	!
8	! Former revisions:
9	! -----------------
10	! $Id: init_masks.f90 553 2010-09-01 14:09:06Z weinreis $
11	!
12	! 493 2010-03-01 08:30:24Z raasch
13	! netcdf_format_mask* and format_parallel_io replaced by netcdf_data_format
14	!
15	! 410 2009-12-04 17:05:40Z letzel
16	! Initial revision
17	!
18	!
19	! Description:
20	! ------------
21	! Initialize masked data output
22	!------------------------------------------------------------------------------!
23
24	USE arrays_3d
25	USE control_parameters
26	USE grid_variables
27	USE indices
28	USE netcdf_control
29	USE particle_attributes
30	USE pegrid
31
32	IMPLICIT NONE
33
34	CHARACTER (LEN=6) :: var
35	CHARACTER (LEN=7) :: unit
36	CHARACTER (LEN=10), DIMENSION(max_masks,100) :: do_mask, do_mask_user
37
38	INTEGER :: i, ilen, ind(6), ind_array(1), j, k, n, sender
39	INTEGER, DIMENSION(:), ALLOCATABLE :: tmp_array
40
41	LOGICAL :: found
42	!
43	!-- Allocation and initialization
44	ALLOCATE( tmp_array( MAX(nx,ny,nz)+1 ) )
45
46	ALLOCATE( mask_i(max_masks,nxr-nxl+1), &
47	mask_j(max_masks,nyn-nys+1), &
48	mask_k(max_masks,nzt-nzb+1) )
49	!
50	!-- internal mask arrays ("mask,dimension,selection")
51	ALLOCATE( mask(max_masks,3,mask_xyz_dimension), &
52	mask_loop(max_masks,3,3) )
53
54	!
55	!-- Parallel mask output not yet tested
56	IF ( netcdf_data_format > 2 ) THEN
57	message_string = 'NetCDF file formats '// &
58	'3 (NetCDF 4) and 4 (NetCDF 4 Classic model)'// &
59	'&are currently not supported (not yet tested).'
60	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
61	ENDIF
62
63	!
64	!-- Store data output parameters for masked data output in few shared arrays
65	DO mid = 1, masks
66	do_mask (mid,:) = data_output_masks(mid,:)
67	do_mask_user(mid,:) = data_output_masks_user(mid,:)
68	mask (mid,1,:) = mask_x(mid,:)
69	mask (mid,2,:) = mask_y(mid,:)
70	mask (mid,3,:) = mask_z(mid,:)
71	mask_loop (mid,1,:) = mask_x_loop(mid,:)
72	mask_loop (mid,2,:) = mask_y_loop(mid,:)
73	mask_loop (mid,3,:) = mask_z_loop(mid,:)
74	ENDDO
75
76	mask_i = -1; mask_j = -1; mask_k = -1
77
78	!
79	!-- Global arrays are required by define_netcdf_header.
80	IF ( myid == 0 .OR. netcdf_data_format > 2 ) THEN
81	ALLOCATE( mask_i_global(max_masks,nx+1), &
82	mask_j_global(max_masks,ny+1), &
83	mask_k_global(max_masks,nz+1) )
84	mask_i_global = -1; mask_j_global = -1; mask_k_global = -1
85	ENDIF
86
87	!
88	!-- Determine variable names for each mask
89	DO mid = 1, masks
90	!
91	!-- Append user-defined data output variables to the standard data output
92	IF ( do_mask_user(mid,1) /= ' ' ) THEN
93	i = 1
94	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
95	i = i + 1
96	ENDDO
97	j = 1
98	DO WHILE ( do_mask_user(mid,j) /= ' ' .AND. j <= 100 )
99	IF ( i > 100 ) THEN
100	WRITE ( message_string, * ) 'number of output quantitities ', &
101	'given by data_output_mask and data_output_mask_user ', &
102	'exceeds the limit of 100'
103	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
104	ENDIF
105	do_mask(mid,i) = do_mask_user(mid,j)
106	i = i + 1
107	j = j + 1
108	ENDDO
109	ENDIF
110
111	!
112	!-- Check and set steering parameters for mask data output and averaging
113	i = 1
114	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
115	!
116	!-- Check for data averaging
117	ilen = LEN_TRIM( do_mask(mid,i) )
118	j = 0 ! no data averaging
119	IF ( ilen > 3 ) THEN
120	IF ( do_mask(mid,i)(ilen-2:ilen) == '_av' ) THEN
121	j = 1 ! data averaging
122	do_mask(mid,i) = do_mask(mid,i)(1:ilen-3)
123	ENDIF
124	ENDIF
125	var = TRIM( do_mask(mid,i) )
126	!
127	!-- Check for allowed value and set units
128	SELECT CASE ( TRIM( var ) )
129
130	CASE ( 'e' )
131	IF ( constant_diffusion ) THEN
132	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
133	'" requires constant_diffusion = .FALSE.'
134	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
135	ENDIF
136	unit = 'm2/s2'
137
138	CASE ( 'pc', 'pr' )
139	IF ( .NOT. particle_advection ) THEN
140	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
141	'" requires a "particles_par"-NAMELIST in the ', &
142	'parameter file (PARIN)'
143	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
144	ENDIF
145	IF ( TRIM( var ) == 'pc' ) unit = 'number'
146	IF ( TRIM( var ) == 'pr' ) unit = 'm'
147
148	CASE ( 'q', 'vpt' )
149	IF ( .NOT. humidity ) THEN
150	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
151	'" requires humidity = .TRUE.'
152	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
153	ENDIF
154	IF ( TRIM( var ) == 'q' ) unit = 'kg/kg'
155	IF ( TRIM( var ) == 'vpt' ) unit = 'K'
156
157	CASE ( 'ql' )
158	IF ( .NOT. ( cloud_physics .OR. cloud_droplets ) ) THEN
159	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
160	'" requires cloud_physics = .TRUE. or cloud_droplets', &
161	' = .TRUE.'
162	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
163	ENDIF
164	unit = 'kg/kg'
165
166	CASE ( 'ql_c', 'ql_v', 'ql_vp' )
167	IF ( .NOT. cloud_droplets ) THEN
168	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
169	'" requires cloud_droplets = .TRUE.'
170	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
171	ENDIF
172	IF ( TRIM( var ) == 'ql_c' ) unit = 'kg/kg'
173	IF ( TRIM( var ) == 'ql_v' ) unit = 'm3'
174	IF ( TRIM( var ) == 'ql_vp' ) unit = 'none'
175
176	CASE ( 'qv' )
177	IF ( .NOT. cloud_physics ) THEN
178	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
179	'" requires cloud_physics = .TRUE.'
180	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
181	ENDIF
182	unit = 'kg/kg'
183
184	CASE ( 'rho' )
185	IF ( .NOT. ocean ) THEN
186	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
187	'" requires ocean = .TRUE.'
188	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
189	ENDIF
190	unit = 'kg/m3'
191
192	CASE ( 's' )
193	IF ( .NOT. passive_scalar ) THEN
194	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
195	'" requires passive_scalar = .TRUE.'
196	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
197	ENDIF
198	unit = 'conc'
199
200	CASE ( 'sa' )
201	IF ( .NOT. ocean ) THEN
202	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
203	'" requires ocean = .TRUE.'
204	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
205	ENDIF
206	unit = 'psu'
207
208	CASE ( 'u', 't', 'lwp', 'pra', 'prr', 'z0' )
209	WRITE ( message_string, * ) 'illegal value for data_',&
210	'output: "', TRIM( var ), '" is only allowed', &
211	'for horizontal cross section'
212	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
213	! IF ( TRIM( var ) == 'lwp*' .AND. .NOT. cloud_physics ) THEN
214	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
215	! '" requires cloud_physics = .TRUE.'
216	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
217	! ENDIF
218	! IF ( TRIM( var ) == 'pra*' .AND. .NOT. precipitation ) THEN
219	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
220	! '" requires precipitation = .TRUE.'
221	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
222	! ENDIF
223	! IF ( TRIM( var ) == 'pra*' .AND. j == 1 ) THEN
224	! WRITE ( message_string, * ) 'temporal averaging of ', &
225	! ' precipitation amount "', TRIM( var ), &
226	! '" not possible'
227	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
228	! ENDIF
229	! IF ( TRIM( var ) == 'prr*' .AND. .NOT. precipitation ) THEN
230	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
231	! '" requires precipitation = .TRUE.'
232	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
233	! ENDIF
234	!
235	! IF ( TRIM( var ) == 'u*' ) unit = 'm/s'
236	! IF ( TRIM( var ) == 't*' ) unit = 'K'
237	! IF ( TRIM( var ) == 'lwp' ) unit = 'kg/kgm'
238	! IF ( TRIM( var ) == 'pra*' ) unit = 'mm'
239	! IF ( TRIM( var ) == 'prr*' ) unit = 'mm/s'
240	! IF ( TRIM( var ) == 'z0*' ) unit = 'm'
241
242	CASE ( 'p', 'pt', 'u', 'v', 'w' )
243	IF ( TRIM( var ) == 'p' ) unit = 'Pa'
244	IF ( TRIM( var ) == 'pt' ) unit = 'K'
245	IF ( TRIM( var ) == 'u' ) unit = 'm/s'
246	IF ( TRIM( var ) == 'v' ) unit = 'm/s'
247	IF ( TRIM( var ) == 'w' ) unit = 'm/s'
248	CONTINUE
249
250	CASE DEFAULT
251	CALL user_check_data_output( var, unit )
252
253	IF ( unit == 'illegal' ) THEN
254	IF ( do_mask_user(mid,1) /= ' ' ) THEN
255	WRITE ( message_string, * ) 'illegal value for data_',&
256	'output or data_output_user: "', &
257	TRIM( do_mask(mid,i) ), '"'
258	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
259	ELSE
260	WRITE ( message_string, * ) 'illegal value for data_',&
261	'output: "', TRIM( do_mask(mid,i) ), '"'
262	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
263	ENDIF
264	ENDIF
265
266	END SELECT
267	!
268	!-- Set the internal steering parameters appropriately
269	domask_no(mid,j) = domask_no(mid,j) + 1
270	domask(mid,j,domask_no(mid,j)) = do_mask(mid,i)
271	domask_unit(mid,j,domask_no(mid,j)) = unit
272
273	IF ( j == 1 ) THEN
274	!
275	!-- Check, if variable is already subject to averaging
276	found = .FALSE.
277	DO k = 1, doav_n
278	IF ( TRIM( doav(k) ) == TRIM( var ) ) found = .TRUE.
279	ENDDO
280
281	IF ( .NOT. found ) THEN
282	doav_n = doav_n + 1
283	doav(doav_n) = var
284	ENDIF
285	ENDIF
286
287	i = i + 1
288
289	ENDDO ! do_mask(mid,i)
290	ENDDO ! mid
291
292
293	!
294	!-- Determine mask locations for each mask
295	DO mid = 1, masks
296	!
297	!-- Set local masks for each subdomain along all three dimensions
298	CALL set_mask_locations( 1, dx, 'dx', nx, 'nx', nxl, nxr )
299	CALL set_mask_locations( 2, dy, 'dy', ny, 'ny', nys, nyn )
300	CALL set_mask_locations( 3, dz, 'dz', nz, 'nz', nzb, nzt )
301	!
302	!-- Set global masks along all three dimensions (required by
303	!-- define_netcdf_header).
304	#if defined( __parallel )
305	!
306	!-- PE0 receives partial arrays from all processors of the respective mask
307	!-- and outputs them. Here a barrier has to be set, because otherwise
308	!-- "-MPI- FATAL: Remote protocol queue full" may occur.
309	CALL MPI_BARRIER( comm2d, ierr )
310
311	IF ( myid == 0 ) THEN
312	!
313	!-- Local arrays can be relocated directly.
314	mask_i_global(mid,mask_start_l(mid,1): &
315	mask_start_l(mid,1)+mask_size_l(mid,1)-1) = &
316	mask_i(mid,:mask_size_l(mid,1))
317	mask_j_global(mid,mask_start_l(mid,2): &
318	mask_start_l(mid,2)+mask_size_l(mid,2)-1) = &
319	mask_j(mid,:mask_size_l(mid,2))
320	mask_k_global(mid,mask_start_l(mid,3): &
321	mask_start_l(mid,3)+mask_size_l(mid,3)-1) = &
322	mask_k(mid,:mask_size_l(mid,3))
323	!
324	!-- Receive data from all other PEs.
325	DO n = 1, numprocs-1
326	!
327	!-- Receive index limits first, then arrays.
328	!-- Index limits are received in arbitrary order from the PEs.
329	CALL MPI_RECV( ind(1), 6, MPI_INTEGER, MPI_ANY_SOURCE, 0, &
330	comm2d, status, ierr )
331	!
332	!-- Not all PEs have data for the mask.
333	IF ( ind(1) /= -9999 ) THEN
334	sender = status(MPI_SOURCE)
335	CALL MPI_RECV( tmp_array(ind(1)), ind(2)-ind(1)+1, &
336	MPI_INTEGER, sender, 1, comm2d, status, ierr )
337	mask_i_global(mid,ind(1):ind(2)) = tmp_array(ind(1):ind(2))
338	CALL MPI_RECV( tmp_array(ind(3)), ind(4)-ind(3)+1, &
339	MPI_INTEGER, sender, 2, comm2d, status, ierr )
340	mask_j_global(mid,ind(3):ind(4)) = tmp_array(ind(3):ind(4))
341	CALL MPI_RECV( tmp_array(ind(5)), ind(6)-ind(5)+1, &
342	MPI_INTEGER, sender, 3, comm2d, status, ierr )
343	mask_k_global(mid,ind(5):ind(6)) = tmp_array(ind(5):ind(6))
344	ENDIF
345	ENDDO
346
347	ELSE
348	!
349	!-- If at least part of the mask resides on the PE, send the index limits
350	!-- for the target array, otherwise send -9999 to PE0.
351	IF ( mask_size_l(mid,1) > 0 .AND. mask_size_l(mid,2) > 0 .AND. &
352	mask_size_l(mid,3) > 0 ) &
353	THEN
354	ind(1) = mask_start_l(mid,1)
355	ind(2) = mask_start_l(mid,1) + mask_size_l(mid,1) - 1
356	ind(3) = mask_start_l(mid,2)
357	ind(4) = mask_start_l(mid,2) + mask_size_l(mid,2) - 1
358	ind(5) = mask_start_l(mid,3)
359	ind(6) = mask_start_l(mid,3) + mask_size_l(mid,3) - 1
360	ELSE
361	ind(1) = -9999; ind(2) = -9999
362	ind(3) = -9999; ind(4) = -9999
363	ind(5) = -9999; ind(6) = -9999
364	ENDIF
365	CALL MPI_SEND( ind(1), 6, MPI_INTEGER, 0, 0, comm2d, ierr )
366	!
367	!-- If applicable, send data to PE0.
368	IF ( ind(1) /= -9999 ) THEN
369	tmp_array(:mask_size_l(mid,1)) = mask_i(mid,:mask_size_l(mid,1))
370	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,1), &
371	MPI_INTEGER, 0, 1, comm2d, ierr )
372	tmp_array(:mask_size_l(mid,2)) = mask_j(mid,:mask_size_l(mid,2))
373	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,2), &
374	MPI_INTEGER, 0, 2, comm2d, ierr )
375	tmp_array(:mask_size_l(mid,3)) = mask_k(mid,:mask_size_l(mid,3))
376	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,3), &
377	MPI_INTEGER, 0, 3, comm2d, ierr )
378	ENDIF
379	ENDIF
380	!
381	!-- A barrier has to be set, because otherwise some PEs may proceed too fast
382	!-- so that PE0 may receive wrong data on tag 0.
383	CALL MPI_BARRIER( comm2d, ierr )
384
385	IF ( netcdf_data_format > 2 ) THEN
386
387	CALL MPI_BCAST( mask_i_global(mid,:), nx+1, MPI_INTEGER, 0, comm2d, &
388	ierr )
389	CALL MPI_BCAST( mask_j_global(mid,:), ny+1, MPI_INTEGER, 0, comm2d, &
390	ierr )
391	CALL MPI_BCAST( mask_k_global(mid,:), nz+1, MPI_INTEGER, 0, comm2d, &
392	ierr )
393
394	ENDIF
395
396	#else
397	!
398	!-- Local arrays can be relocated directly.
399	mask_i_global(mid,:) = mask_i(mid,:)
400	mask_j_global(mid,:) = mask_j(mid,:)
401	mask_k_global(mid,:) = mask_k(mid,:)
402	#endif
403	ENDDO ! mid
404
405	DEALLOCATE( tmp_array )
406	!
407	!-- Internal mask arrays cannot be deallocated on PE 0 because they are
408	!-- required for header output on PE 0.
409	IF ( myid /= 0 ) DEALLOCATE( mask, mask_loop )
410
411	CONTAINS
412
413	SUBROUTINE set_mask_locations( dim, dxyz, dxyz_string, nxyz, nxyz_string, &
414	lb, ub )
415	!------------------------------------------------------------------------------!
416	!
417	! Description:
418	! ------------
419	! Set local mask for each subdomain along 'dim' direction.
420	!------------------------------------------------------------------------------!
421
422	IMPLICIT NONE
423
424	CHARACTER (LEN=2) :: dxyz_string, nxyz_string
425	INTEGER :: count, count_l, dim, m, loop_begin, loop_end, loop_stride, &
426	lb, nxyz, ub
427	REAL :: dxyz, ddxyz, tmp1, tmp2
428
429	count = 0; count_l = 0; ddxyz = 1.0 / dxyz; tmp1 = 0.0; tmp2 = 0.0
430
431	IF ( mask(mid,dim,1) >= 0.0 ) THEN
432	!
433	!-- use predefined mask_* array
434	DO WHILE ( mask(mid,dim,count+1) >= 0.0 )
435	count = count + 1
436	IF ( dim == 1 .OR. dim == 2 ) THEN
437	m = NINT( mask(mid,dim,count) * mask_scale(dim) * ddxyz )
438	ELSEIF ( dim == 3 ) THEN
439	ind_array = &
440	MINLOC( ABS( mask(mid,dim,count) * mask_scale(dim) - zw ) )
441	m = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
442	ENDIF
443	IF ( m > nxyz ) THEN
444	WRITE ( message_string, '(I3,A,I3,A,I1,3A,I3)' ) &
445	m,' in mask ',mid,' along dimension ',dim, &
446	' exceeds ',nxyz_string,' = ',nxyz
447	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
448	ENDIF
449	IF ( m >= lb .AND. m <= ub ) THEN
450	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
451	count_l = count_l + 1
452	IF ( dim == 1 ) THEN
453	mask_i(mid,count_l) = m
454	ELSEIF ( dim == 2 ) THEN
455	mask_j(mid,count_l) = m
456	ELSEIF ( dim == 3 ) THEN
457	mask_k(mid,count_l) = m
458	ENDIF
459	ENDIF
460	IF ( count == mask_xyz_dimension ) EXIT
461	ENDDO
462	mask_size(mid,dim) = count
463	mask_size_l(mid,dim) = count_l
464
465	ELSE
466	!
467	!-- use predefined mask_loop_* array, or use the default (all grid points
468	!-- along this direction)
469	IF ( mask_loop(mid,dim,1) < 0.0 ) THEN
470	tmp1 = mask_loop(mid,dim,1)
471	mask_loop(mid,dim,1) = 0.0 ! (default)
472	ENDIF
473	IF ( dim == 1 .OR. dim == 2 ) THEN
474	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
475	tmp2 = mask_loop(mid,dim,2)
476	mask_loop(mid,dim,2) = nxyz*dxyz / mask_scale(dim) ! (default)
477	ENDIF
478	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
479	> nxyz * dxyz / mask_scale(dim) ) THEN
480	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),5A,I1,A,F9.3)' ) &
481	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
482	' and/or mask_loop(',mid,',',dim,',2)=', &
483	mask_loop(mid,dim,2),'&exceed ', &
484	nxyz_string,'*',dxyz_string,'/mask_scale(',dim,')=', &
485	nxyz*dxyz/mask_scale(dim)
486	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
487	ENDIF
488	loop_begin = NINT( mask_loop(mid,dim,1) * mask_scale(dim) * ddxyz )
489	loop_end = NINT( mask_loop(mid,dim,2) * mask_scale(dim) * ddxyz )
490	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
491	ELSEIF ( dim == 3 ) THEN
492	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
493	tmp2 = mask_loop(mid,dim,2)
494	mask_loop(mid,dim,2) = zw(nz) / mask_scale(dim) ! (default)
495	ENDIF
496	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
497	> zw(nz) / mask_scale(dim) ) THEN
498	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),A,I1,A,F9.3)' ) &
499	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
500	' and/or mask_loop(',mid,',',dim,',2)=', &
501	mask_loop(mid,dim,2),'&exceed zw(nz)/mask_scale(',dim, &
502	')=',zw(nz)/mask_scale(dim)
503	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
504	ENDIF
505	ind_array = &
506	MINLOC( ABS( mask_loop(mid,dim,1) * mask_scale(dim) - zw ) )
507	loop_begin = &
508	ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
509	ind_array = &
510	MINLOC( ABS( mask_loop(mid,dim,2) * mask_scale(dim) - zw ) )
511	loop_end = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
512	!
513	!-- The following line assumes a constant vertical grid spacing within
514	!-- the vertical mask range; it fails for vertical grid stretching.
515	!-- Maybe revise later. Issue warning but continue execution.
516	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
517
518	IF ( mask_loop(mid,dim,2) * mask_scale(dim) > dz_stretch_level ) &
519	THEN
520	WRITE ( message_string, '(A,I3,A,I1,A,F9.3,A,F8.2,3A)' ) &
521	'mask_loop(',mid,dim,',2)=', mask_loop(mid,dim,2),&
522	' exceeds dz_stretch_level=',dz_stretch_level, &
523	'.&Vertical mask locations will not ', &
524	'match the desired heights&within the stretching ', &
525	'region. Recommendation: use mask instead of mask_loop.'
526	CALL message( 'init_masks', 'PA9998', 0, 1, 0, 6, 0 )
527	ENDIF
528
529	ENDIF
530	!
531	!-- If necessary, reset mask_loop(mid,dim,1) and mask_loop(mid,dim,2).
532	IF ( tmp1 < 0.0 ) mask_loop(mid,dim,1) = tmp1
533	IF ( tmp2 < 0.0 ) mask_loop(mid,dim,2) = tmp2
534	!
535	!-- The default stride +/-1 (every grid point) applies if
536	!-- mask_loop(mid,dim,3) is not specified (its default is zero).
537	IF ( loop_stride == 0 ) THEN
538	IF ( loop_end >= loop_begin ) THEN
539	loop_stride = 1
540	ELSE
541	loop_stride = -1
542	ENDIF
543	ENDIF
544	DO m = loop_begin, loop_end, loop_stride
545	count = count + 1
546	IF ( m >= lb .AND. m <= ub ) THEN
547	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
548	count_l = count_l + 1
549	IF ( dim == 1 ) THEN
550	mask_i(mid,count_l) = m
551	ELSEIF ( dim == 2 ) THEN
552	mask_j(mid,count_l) = m
553	ELSEIF ( dim == 3 ) THEN
554	mask_k(mid,count_l) = m
555	ENDIF
556	ENDIF
557	ENDDO
558	mask_size(mid,dim) = count
559	mask_size_l(mid,dim) = count_l
560	ENDIF
561
562	END SUBROUTINE set_mask_locations
563
564	END SUBROUTINE init_masks

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