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source: palm/trunk/SOURCE/init_masks.f90 @ 590

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

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