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source: palm/trunk/SOURCE/init_masks.f90 @ 559

Last change on this file since 559 was 558, checked in by weinreis, 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 558 2010-09-07 14:52:07Z weinreis $
11	!
12	! 557 2010-09-07 14:50:07Z weinreis
13	! bugfix message string in set_mask_locations
14	!
15	! 553 2010-09-01 14:09:06Z weinreis
16	! parameters for masked output are replaced by arrays
17	!
18	! 493 2010-03-01 08:30:24Z raasch
19	! netcdf_format_mask* and format_parallel_io replaced by netcdf_data_format
20	!
21	! 410 2009-12-04 17:05:40Z letzel
22	! Initial revision
23	!
24	!
25	! Description:
26	! ------------
27	! Initialize masked data output
28	!------------------------------------------------------------------------------!
29
30	USE arrays_3d
31	USE control_parameters
32	USE grid_variables
33	USE indices
34	USE netcdf_control
35	USE particle_attributes
36	USE pegrid
37
38	IMPLICIT NONE
39
40	CHARACTER (LEN=6) :: var
41	CHARACTER (LEN=7) :: unit
42	CHARACTER (LEN=10), DIMENSION(max_masks,100) :: do_mask, do_mask_user
43
44	INTEGER :: i, ilen, ind(6), ind_array(1), j, k, n, sender
45	INTEGER, DIMENSION(:), ALLOCATABLE :: tmp_array
46
47	LOGICAL :: found
48	!
49	!-- Allocation and initialization
50	ALLOCATE( tmp_array( MAX(nx,ny,nz)+1 ) )
51
52	ALLOCATE( mask_i(max_masks,nxr-nxl+1), &
53	mask_j(max_masks,nyn-nys+1), &
54	mask_k(max_masks,nzt-nzb+1) )
55	!
56	!-- internal mask arrays ("mask,dimension,selection")
57	ALLOCATE( mask(max_masks,3,mask_xyz_dimension), &
58	mask_loop(max_masks,3,3) )
59
60	!
61	!-- Parallel mask output not yet tested
62	IF ( netcdf_data_format > 2 ) THEN
63	message_string = 'NetCDF file formats '// &
64	'3 (NetCDF 4) and 4 (NetCDF 4 Classic model)'// &
65	'&are currently not supported (not yet tested).'
66	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
67	ENDIF
68
69	!
70	!-- Store data output parameters for masked data output in few shared arrays
71	DO mid = 1, masks
72	do_mask (mid,:) = data_output_masks(mid,:)
73	do_mask_user(mid,:) = data_output_masks_user(mid,:)
74	mask (mid,1,:) = mask_x(mid,:)
75	mask (mid,2,:) = mask_y(mid,:)
76	mask (mid,3,:) = mask_z(mid,:)
77	mask_loop (mid,1,:) = mask_x_loop(mid,:)
78	mask_loop (mid,2,:) = mask_y_loop(mid,:)
79	mask_loop (mid,3,:) = mask_z_loop(mid,:)
80	ENDDO
81
82	mask_i = -1; mask_j = -1; mask_k = -1
83
84	!
85	!-- Global arrays are required by define_netcdf_header.
86	IF ( myid == 0 .OR. netcdf_data_format > 2 ) THEN
87	ALLOCATE( mask_i_global(max_masks,nx+1), &
88	mask_j_global(max_masks,ny+1), &
89	mask_k_global(max_masks,nz+1) )
90	mask_i_global = -1; mask_j_global = -1; mask_k_global = -1
91	ENDIF
92
93	!
94	!-- Determine variable names for each mask
95	DO mid = 1, masks
96	!
97	!-- Append user-defined data output variables to the standard data output
98	IF ( do_mask_user(mid,1) /= ' ' ) THEN
99	i = 1
100	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
101	i = i + 1
102	ENDDO
103	j = 1
104	DO WHILE ( do_mask_user(mid,j) /= ' ' .AND. j <= 100 )
105	IF ( i > 100 ) THEN
106	WRITE ( message_string, * ) 'number of output quantitities ', &
107	'given by data_output_mask and data_output_mask_user ', &
108	'exceeds the limit of 100'
109	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
110	ENDIF
111	do_mask(mid,i) = do_mask_user(mid,j)
112	i = i + 1
113	j = j + 1
114	ENDDO
115	ENDIF
116
117	!
118	!-- Check and set steering parameters for mask data output and averaging
119	i = 1
120	DO WHILE ( do_mask(mid,i) /= ' ' .AND. i <= 100 )
121	!
122	!-- Check for data averaging
123	ilen = LEN_TRIM( do_mask(mid,i) )
124	j = 0 ! no data averaging
125	IF ( ilen > 3 ) THEN
126	IF ( do_mask(mid,i)(ilen-2:ilen) == '_av' ) THEN
127	j = 1 ! data averaging
128	do_mask(mid,i) = do_mask(mid,i)(1:ilen-3)
129	ENDIF
130	ENDIF
131	var = TRIM( do_mask(mid,i) )
132	!
133	!-- Check for allowed value and set units
134	SELECT CASE ( TRIM( var ) )
135
136	CASE ( 'e' )
137	IF ( constant_diffusion ) THEN
138	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
139	'" requires constant_diffusion = .FALSE.'
140	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
141	ENDIF
142	unit = 'm2/s2'
143
144	CASE ( 'pc', 'pr' )
145	IF ( .NOT. particle_advection ) THEN
146	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
147	'" requires a "particles_par"-NAMELIST in the ', &
148	'parameter file (PARIN)'
149	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
150	ENDIF
151	IF ( TRIM( var ) == 'pc' ) unit = 'number'
152	IF ( TRIM( var ) == 'pr' ) unit = 'm'
153
154	CASE ( 'q', 'vpt' )
155	IF ( .NOT. humidity ) THEN
156	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
157	'" requires humidity = .TRUE.'
158	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
159	ENDIF
160	IF ( TRIM( var ) == 'q' ) unit = 'kg/kg'
161	IF ( TRIM( var ) == 'vpt' ) unit = 'K'
162
163	CASE ( 'ql' )
164	IF ( .NOT. ( cloud_physics .OR. cloud_droplets ) ) THEN
165	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
166	'" requires cloud_physics = .TRUE. or cloud_droplets', &
167	' = .TRUE.'
168	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
169	ENDIF
170	unit = 'kg/kg'
171
172	CASE ( 'ql_c', 'ql_v', 'ql_vp' )
173	IF ( .NOT. cloud_droplets ) THEN
174	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
175	'" requires cloud_droplets = .TRUE.'
176	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
177	ENDIF
178	IF ( TRIM( var ) == 'ql_c' ) unit = 'kg/kg'
179	IF ( TRIM( var ) == 'ql_v' ) unit = 'm3'
180	IF ( TRIM( var ) == 'ql_vp' ) unit = 'none'
181
182	CASE ( 'qv' )
183	IF ( .NOT. cloud_physics ) THEN
184	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
185	'" requires cloud_physics = .TRUE.'
186	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
187	ENDIF
188	unit = 'kg/kg'
189
190	CASE ( 'rho' )
191	IF ( .NOT. ocean ) THEN
192	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
193	'" requires ocean = .TRUE.'
194	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
195	ENDIF
196	unit = 'kg/m3'
197
198	CASE ( 's' )
199	IF ( .NOT. passive_scalar ) THEN
200	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
201	'" requires passive_scalar = .TRUE.'
202	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
203	ENDIF
204	unit = 'conc'
205
206	CASE ( 'sa' )
207	IF ( .NOT. ocean ) THEN
208	WRITE ( message_string, * ) 'output of "', TRIM( var ), &
209	'" requires ocean = .TRUE.'
210	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
211	ENDIF
212	unit = 'psu'
213
214	CASE ( 'u', 't', 'lwp', 'pra', 'prr', 'z0' )
215	WRITE ( message_string, * ) 'illegal value for data_',&
216	'output: "', TRIM( var ), '" is only allowed', &
217	'for horizontal cross section'
218	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
219	! IF ( TRIM( var ) == 'lwp*' .AND. .NOT. cloud_physics ) THEN
220	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
221	! '" requires cloud_physics = .TRUE.'
222	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
223	! ENDIF
224	! IF ( TRIM( var ) == 'pra*' .AND. .NOT. precipitation ) THEN
225	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
226	! '" requires precipitation = .TRUE.'
227	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
228	! ENDIF
229	! IF ( TRIM( var ) == 'pra*' .AND. j == 1 ) THEN
230	! WRITE ( message_string, * ) 'temporal averaging of ', &
231	! ' precipitation amount "', TRIM( var ), &
232	! '" not possible'
233	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
234	! ENDIF
235	! IF ( TRIM( var ) == 'prr*' .AND. .NOT. precipitation ) THEN
236	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
237	! '" requires precipitation = .TRUE.'
238	! CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
239	! ENDIF
240	!
241	! IF ( TRIM( var ) == 'u*' ) unit = 'm/s'
242	! IF ( TRIM( var ) == 't*' ) unit = 'K'
243	! IF ( TRIM( var ) == 'lwp' ) unit = 'kg/kgm'
244	! IF ( TRIM( var ) == 'pra*' ) unit = 'mm'
245	! IF ( TRIM( var ) == 'prr*' ) unit = 'mm/s'
246	! IF ( TRIM( var ) == 'z0*' ) unit = 'm'
247
248	CASE ( 'p', 'pt', 'u', 'v', 'w' )
249	IF ( TRIM( var ) == 'p' ) unit = 'Pa'
250	IF ( TRIM( var ) == 'pt' ) unit = 'K'
251	IF ( TRIM( var ) == 'u' ) unit = 'm/s'
252	IF ( TRIM( var ) == 'v' ) unit = 'm/s'
253	IF ( TRIM( var ) == 'w' ) unit = 'm/s'
254	CONTINUE
255
256	CASE DEFAULT
257	CALL user_check_data_output( var, unit )
258
259	IF ( unit == 'illegal' ) THEN
260	IF ( do_mask_user(mid,1) /= ' ' ) THEN
261	WRITE ( message_string, * ) 'illegal value for data_',&
262	'output or data_output_user: "', &
263	TRIM( do_mask(mid,i) ), '"'
264	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
265	ELSE
266	WRITE ( message_string, * ) 'illegal value for data_',&
267	'output: "', TRIM( do_mask(mid,i) ), '"'
268	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
269	ENDIF
270	ENDIF
271
272	END SELECT
273	!
274	!-- Set the internal steering parameters appropriately
275	domask_no(mid,j) = domask_no(mid,j) + 1
276	domask(mid,j,domask_no(mid,j)) = do_mask(mid,i)
277	domask_unit(mid,j,domask_no(mid,j)) = unit
278
279	IF ( j == 1 ) THEN
280	!
281	!-- Check, if variable is already subject to averaging
282	found = .FALSE.
283	DO k = 1, doav_n
284	IF ( TRIM( doav(k) ) == TRIM( var ) ) found = .TRUE.
285	ENDDO
286
287	IF ( .NOT. found ) THEN
288	doav_n = doav_n + 1
289	doav(doav_n) = var
290	ENDIF
291	ENDIF
292
293	i = i + 1
294
295	ENDDO ! do_mask(mid,i)
296	ENDDO ! mid
297
298
299	!
300	!-- Determine mask locations for each mask
301	DO mid = 1, masks
302	!
303	!-- Set local masks for each subdomain along all three dimensions
304	CALL set_mask_locations( 1, dx, 'dx', nx, 'nx', nxl, nxr )
305	CALL set_mask_locations( 2, dy, 'dy', ny, 'ny', nys, nyn )
306	CALL set_mask_locations( 3, dz, 'dz', nz, 'nz', nzb, nzt )
307	!
308	!-- Set global masks along all three dimensions (required by
309	!-- define_netcdf_header).
310	#if defined( __parallel )
311	!
312	!-- PE0 receives partial arrays from all processors of the respective mask
313	!-- and outputs them. Here a barrier has to be set, because otherwise
314	!-- "-MPI- FATAL: Remote protocol queue full" may occur.
315	CALL MPI_BARRIER( comm2d, ierr )
316
317	IF ( myid == 0 ) THEN
318	!
319	!-- Local arrays can be relocated directly.
320	mask_i_global(mid,mask_start_l(mid,1): &
321	mask_start_l(mid,1)+mask_size_l(mid,1)-1) = &
322	mask_i(mid,:mask_size_l(mid,1))
323	mask_j_global(mid,mask_start_l(mid,2): &
324	mask_start_l(mid,2)+mask_size_l(mid,2)-1) = &
325	mask_j(mid,:mask_size_l(mid,2))
326	mask_k_global(mid,mask_start_l(mid,3): &
327	mask_start_l(mid,3)+mask_size_l(mid,3)-1) = &
328	mask_k(mid,:mask_size_l(mid,3))
329	!
330	!-- Receive data from all other PEs.
331	DO n = 1, numprocs-1
332	!
333	!-- Receive index limits first, then arrays.
334	!-- Index limits are received in arbitrary order from the PEs.
335	CALL MPI_RECV( ind(1), 6, MPI_INTEGER, MPI_ANY_SOURCE, 0, &
336	comm2d, status, ierr )
337	!
338	!-- Not all PEs have data for the mask.
339	IF ( ind(1) /= -9999 ) THEN
340	sender = status(MPI_SOURCE)
341	CALL MPI_RECV( tmp_array(ind(1)), ind(2)-ind(1)+1, &
342	MPI_INTEGER, sender, 1, comm2d, status, ierr )
343	mask_i_global(mid,ind(1):ind(2)) = tmp_array(ind(1):ind(2))
344	CALL MPI_RECV( tmp_array(ind(3)), ind(4)-ind(3)+1, &
345	MPI_INTEGER, sender, 2, comm2d, status, ierr )
346	mask_j_global(mid,ind(3):ind(4)) = tmp_array(ind(3):ind(4))
347	CALL MPI_RECV( tmp_array(ind(5)), ind(6)-ind(5)+1, &
348	MPI_INTEGER, sender, 3, comm2d, status, ierr )
349	mask_k_global(mid,ind(5):ind(6)) = tmp_array(ind(5):ind(6))
350	ENDIF
351	ENDDO
352
353	ELSE
354	!
355	!-- If at least part of the mask resides on the PE, send the index limits
356	!-- for the target array, otherwise send -9999 to PE0.
357	IF ( mask_size_l(mid,1) > 0 .AND. mask_size_l(mid,2) > 0 .AND. &
358	mask_size_l(mid,3) > 0 ) &
359	THEN
360	ind(1) = mask_start_l(mid,1)
361	ind(2) = mask_start_l(mid,1) + mask_size_l(mid,1) - 1
362	ind(3) = mask_start_l(mid,2)
363	ind(4) = mask_start_l(mid,2) + mask_size_l(mid,2) - 1
364	ind(5) = mask_start_l(mid,3)
365	ind(6) = mask_start_l(mid,3) + mask_size_l(mid,3) - 1
366	ELSE
367	ind(1) = -9999; ind(2) = -9999
368	ind(3) = -9999; ind(4) = -9999
369	ind(5) = -9999; ind(6) = -9999
370	ENDIF
371	CALL MPI_SEND( ind(1), 6, MPI_INTEGER, 0, 0, comm2d, ierr )
372	!
373	!-- If applicable, send data to PE0.
374	IF ( ind(1) /= -9999 ) THEN
375	tmp_array(:mask_size_l(mid,1)) = mask_i(mid,:mask_size_l(mid,1))
376	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,1), &
377	MPI_INTEGER, 0, 1, comm2d, ierr )
378	tmp_array(:mask_size_l(mid,2)) = mask_j(mid,:mask_size_l(mid,2))
379	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,2), &
380	MPI_INTEGER, 0, 2, comm2d, ierr )
381	tmp_array(:mask_size_l(mid,3)) = mask_k(mid,:mask_size_l(mid,3))
382	CALL MPI_SEND( tmp_array(1), mask_size_l(mid,3), &
383	MPI_INTEGER, 0, 3, comm2d, ierr )
384	ENDIF
385	ENDIF
386	!
387	!-- A barrier has to be set, because otherwise some PEs may proceed too fast
388	!-- so that PE0 may receive wrong data on tag 0.
389	CALL MPI_BARRIER( comm2d, ierr )
390
391	IF ( netcdf_data_format > 2 ) THEN
392
393	CALL MPI_BCAST( mask_i_global(mid,:), nx+1, MPI_INTEGER, 0, comm2d, &
394	ierr )
395	CALL MPI_BCAST( mask_j_global(mid,:), ny+1, MPI_INTEGER, 0, comm2d, &
396	ierr )
397	CALL MPI_BCAST( mask_k_global(mid,:), nz+1, MPI_INTEGER, 0, comm2d, &
398	ierr )
399
400	ENDIF
401
402	#else
403	!
404	!-- Local arrays can be relocated directly.
405	mask_i_global(mid,:) = mask_i(mid,:)
406	mask_j_global(mid,:) = mask_j(mid,:)
407	mask_k_global(mid,:) = mask_k(mid,:)
408	#endif
409	ENDDO ! mid
410
411	DEALLOCATE( tmp_array )
412	!
413	!-- Internal mask arrays cannot be deallocated on PE 0 because they are
414	!-- required for header output on PE 0.
415	IF ( myid /= 0 ) DEALLOCATE( mask, mask_loop )
416
417	CONTAINS
418
419	SUBROUTINE set_mask_locations( dim, dxyz, dxyz_string, nxyz, nxyz_string, &
420	lb, ub )
421	!------------------------------------------------------------------------------!
422	!
423	! Description:
424	! ------------
425	! Set local mask for each subdomain along 'dim' direction.
426	!------------------------------------------------------------------------------!
427
428	IMPLICIT NONE
429
430	CHARACTER (LEN=2) :: dxyz_string, nxyz_string
431	INTEGER :: count, count_l, dim, m, loop_begin, loop_end, loop_stride, &
432	lb, nxyz, ub
433	REAL :: dxyz, ddxyz, tmp1, tmp2
434
435	count = 0; count_l = 0; ddxyz = 1.0 / dxyz; tmp1 = 0.0; tmp2 = 0.0
436
437	IF ( mask(mid,dim,1) >= 0.0 ) THEN
438	!
439	!-- use predefined mask_* array
440	DO WHILE ( mask(mid,dim,count+1) >= 0.0 )
441	count = count + 1
442	IF ( dim == 1 .OR. dim == 2 ) THEN
443	m = NINT( mask(mid,dim,count) * mask_scale(dim) * ddxyz )
444	ELSEIF ( dim == 3 ) THEN
445	ind_array = &
446	MINLOC( ABS( mask(mid,dim,count) * mask_scale(dim) - zw ) )
447	m = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
448	ENDIF
449	IF ( m > nxyz ) THEN
450	WRITE ( message_string, '(I3,A,I3,A,I1,3A,I3)' ) &
451	m,' in mask ',mid,' along dimension ',dim, &
452	' exceeds ',nxyz_string,' = ',nxyz
453	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
454	ENDIF
455	IF ( m >= lb .AND. m <= ub ) THEN
456	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
457	count_l = count_l + 1
458	IF ( dim == 1 ) THEN
459	mask_i(mid,count_l) = m
460	ELSEIF ( dim == 2 ) THEN
461	mask_j(mid,count_l) = m
462	ELSEIF ( dim == 3 ) THEN
463	mask_k(mid,count_l) = m
464	ENDIF
465	ENDIF
466	IF ( count == mask_xyz_dimension ) EXIT
467	ENDDO
468	mask_size(mid,dim) = count
469	mask_size_l(mid,dim) = count_l
470
471	ELSE
472	!
473	!-- use predefined mask_loop_* array, or use the default (all grid points
474	!-- along this direction)
475	IF ( mask_loop(mid,dim,1) < 0.0 ) THEN
476	tmp1 = mask_loop(mid,dim,1)
477	mask_loop(mid,dim,1) = 0.0 ! (default)
478	ENDIF
479	IF ( dim == 1 .OR. dim == 2 ) THEN
480	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
481	tmp2 = mask_loop(mid,dim,2)
482	mask_loop(mid,dim,2) = nxyz*dxyz / mask_scale(dim) ! (default)
483	ENDIF
484	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
485	> nxyz * dxyz / mask_scale(dim) ) THEN
486	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),5A,I1,A,F9.3)' ) &
487	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
488	' and/or mask_loop(',mid,',',dim,',2)=', &
489	mask_loop(mid,dim,2),'&exceed ', &
490	nxyz_string,'*',dxyz_string,'/mask_scale(',dim,')=', &
491	nxyz*dxyz/mask_scale(dim)
492	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
493	ENDIF
494	loop_begin = NINT( mask_loop(mid,dim,1) * mask_scale(dim) * ddxyz )
495	loop_end = NINT( mask_loop(mid,dim,2) * mask_scale(dim) * ddxyz )
496	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
497	ELSEIF ( dim == 3 ) THEN
498	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
499	tmp2 = mask_loop(mid,dim,2)
500	mask_loop(mid,dim,2) = zw(nz) / mask_scale(dim) ! (default)
501	ENDIF
502	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
503	> zw(nz) / mask_scale(dim) ) THEN
504	WRITE ( message_string, '(2(A,I3,A,I1,A,F9.3),A,I1,A,F9.3)' ) &
505	'mask_loop(',mid,',',dim,',1)=',mask_loop(mid,dim,1), &
506	' and/or mask_loop(',mid,',',dim,',2)=', &
507	mask_loop(mid,dim,2),'&exceed zw(nz)/mask_scale(',dim, &
508	')=',zw(nz)/mask_scale(dim)
509	CALL message( 'init_masks', 'PA9998', 1, 2, 0, 6, 0 )
510	ENDIF
511	ind_array = &
512	MINLOC( ABS( mask_loop(mid,dim,1) * mask_scale(dim) - zw ) )
513	loop_begin = &
514	ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
515	ind_array = &
516	MINLOC( ABS( mask_loop(mid,dim,2) * mask_scale(dim) - zw ) )
517	loop_end = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
518	!
519	!-- The following line assumes a constant vertical grid spacing within
520	!-- the vertical mask range; it fails for vertical grid stretching.
521	!-- Maybe revise later. Issue warning but continue execution.
522	loop_stride = NINT( mask_loop(mid,dim,3) * mask_scale(dim) * ddxyz )
523
524	IF ( mask_loop(mid,dim,2) * mask_scale(dim) > dz_stretch_level ) &
525	THEN
526	WRITE ( message_string, '(A,I3,A,I1,A,F9.3,A,F8.2,3A)' ) &
527	'mask_loop(',mid,',',dim,',2)=', mask_loop(mid,dim,2),&
528	' exceeds dz_stretch_level=',dz_stretch_level, &
529	'.&Vertical mask locations will not ', &
530	'match the desired heights&within the stretching ', &
531	'region. Recommendation: use mask instead of mask_loop.'
532	CALL message( 'init_masks', 'PA9998', 0, 1, 0, 6, 0 )
533	ENDIF
534
535	ENDIF
536	!
537	!-- If necessary, reset mask_loop(mid,dim,1) and mask_loop(mid,dim,2).
538	IF ( tmp1 < 0.0 ) mask_loop(mid,dim,1) = tmp1
539	IF ( tmp2 < 0.0 ) mask_loop(mid,dim,2) = tmp2
540	!
541	!-- The default stride +/-1 (every grid point) applies if
542	!-- mask_loop(mid,dim,3) is not specified (its default is zero).
543	IF ( loop_stride == 0 ) THEN
544	IF ( loop_end >= loop_begin ) THEN
545	loop_stride = 1
546	ELSE
547	loop_stride = -1
548	ENDIF
549	ENDIF
550	DO m = loop_begin, loop_end, loop_stride
551	count = count + 1
552	IF ( m >= lb .AND. m <= ub ) THEN
553	IF ( count_l == 0 ) mask_start_l(mid,dim) = count
554	count_l = count_l + 1
555	IF ( dim == 1 ) THEN
556	mask_i(mid,count_l) = m
557	ELSEIF ( dim == 2 ) THEN
558	mask_j(mid,count_l) = m
559	ELSEIF ( dim == 3 ) THEN
560	mask_k(mid,count_l) = m
561	ENDIF
562	ENDIF
563	ENDDO
564	mask_size(mid,dim) = count
565	mask_size_l(mid,dim) = count_l
566	ENDIF
567
568	END SUBROUTINE set_mask_locations
569
570	END SUBROUTINE init_masks

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