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source: palm/trunk/SOURCE/init_masks.f90 @ 750

Last change on this file since 750 was 596, 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 596 2010-11-12 09:57:10Z suehring $
11	!
12	! 595 2010-11-12 09:52:10Z helmke
13	! Calculation of z locations for masked output changed
14	!
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	!
19	! 557 2010-09-07 14:50:07Z weinreis
20	! bugfix message string in set_mask_locations
21	!
22	! 553 2010-09-01 14:09:06Z weinreis
23	! parameters for masked output are replaced by arrays
24	!
25	! 493 2010-03-01 08:30:24Z raasch
26	! netcdf_format_mask* and format_parallel_io replaced by netcdf_data_format
27	!
28	! 410 2009-12-04 17:05:40Z letzel
29	! Initial revision
30	!
31	!
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) )
66
67	!
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).'
73	CALL message( 'init_masks', 'PA0328', 1, 2, 0, 6, 0 )
74	ENDIF
75
76	!
77	!-- Store data output parameters for masked data output in few shared arrays
78	DO mid = 1, masks
79
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,:)
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
108	ENDDO
109
110	mask_i = -1; mask_j = -1; mask_k = -1
111
112	!
113	!-- Global arrays are required by define_netcdf_header.
114	IF ( myid == 0 .OR. netcdf_data_format > 2 ) THEN
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'
137	CALL message( 'init_masks', 'PA0329', 1, 2, 0, 6, 0 )
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.'
168	CALL message( 'init_masks', 'PA0103', 1, 2, 0, 6, 0 )
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)'
177	CALL message( 'init_masks', 'PA0104', 1, 2, 0, 6, 0 )
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.'
186	CALL message( 'init_masks', 'PA0105', 1, 2, 0, 6, 0 )
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.'
196	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
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.'
204	CALL message( 'init_masks', 'PA0107', 1, 2, 0, 6, 0 )
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.'
214	CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
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.'
222	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
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.'
230	CALL message( 'init_masks', 'PA0110', 1, 2, 0, 6, 0 )
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.'
238	CALL message( 'init_masks', 'PA0109', 1, 2, 0, 6, 0 )
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'
246	CALL message( 'init_masks', 'PA0111', 1, 2, 0, 6, 0 )
247	! IF ( TRIM( var ) == 'lwp*' .AND. .NOT. cloud_physics ) THEN
248	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
249	! '" requires cloud_physics = .TRUE.'
250	! CALL message( 'init_masks', 'PA0108', 1, 2, 0, 6, 0 )
251	! ENDIF
252	! IF ( TRIM( var ) == 'pra*' .AND. .NOT. precipitation ) THEN
253	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
254	! '" requires precipitation = .TRUE.'
255	! CALL message( 'init_masks', 'PA0112', 1, 2, 0, 6, 0 )
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'
261	! CALL message( 'init_masks', 'PA0113', 1, 2, 0, 6, 0 )
262	! ENDIF
263	! IF ( TRIM( var ) == 'prr*' .AND. .NOT. precipitation ) THEN
264	! WRITE ( message_string, * ) 'output of "', TRIM( var ), &
265	! '" requires precipitation = .TRUE.'
266	! CALL message( 'init_masks', 'PA0112', 1, 2, 0, 6, 0 )
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) ), '"'
292	CALL message( 'init_masks', 'PA0114', 1, 2, 0, 6, 0 )
293	ELSE
294	WRITE ( message_string, * ) 'illegal value for data_',&
295	'output: "', TRIM( do_mask(mid,i) ), '"'
296	CALL message( 'init_masks', 'PA0330', 1, 2, 0, 6, 0 )
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, &
370	MPI_INTEGER, sender, 1, comm2d, status, ierr )
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, &
373	MPI_INTEGER, sender, 2, comm2d, status, ierr )
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, &
376	MPI_INTEGER, sender, 3, comm2d, status, ierr )
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), &
405	MPI_INTEGER, 0, 1, comm2d, ierr )
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), &
408	MPI_INTEGER, 0, 2, comm2d, ierr )
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), &
411	MPI_INTEGER, 0, 3, comm2d, ierr )
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 )
418
419	IF ( netcdf_data_format > 2 ) THEN
420
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 )
427
428	ENDIF
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
446
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
471	m = NINT( mask(mid,dim,count) * mask_scale(dim) * ddxyz )
472	ELSEIF ( dim == 3 ) THEN
473	ind_array = &
474	MINLOC( ABS( mask(mid,dim,count) * mask_scale(dim) - zu ) )
475	m = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
476	ENDIF
477	IF ( m > nxyz ) THEN
478	WRITE ( message_string, '(I3,A,I3,A,I1,3A,I3)' ) &
479	m,' in mask ',mid,' along dimension ',dim, &
480	' exceeds ',nxyz_string,' = ',nxyz
481	CALL message( 'init_masks', 'PA0331', 1, 2, 0, 6, 0 )
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)
510	mask_loop(mid,dim,2) = nxyz*dxyz / mask_scale(dim) ! (default)
511	ENDIF
512	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
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)
520	CALL message( 'init_masks', 'PA0332', 1, 2, 0, 6, 0 )
521	ENDIF
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 )
525	ELSEIF ( dim == 3 ) THEN
526	IF ( mask_loop(mid,dim,2) < 0.0 ) THEN
527	tmp2 = mask_loop(mid,dim,2)
528	mask_loop(mid,dim,2) = zu(nz) / mask_scale(dim) ! (default)
529	ENDIF
530	IF ( MAXVAL( mask_loop(mid,dim,1:2) ) &
531	> zu(nz) / mask_scale(dim) ) THEN
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)=', &
535	mask_loop(mid,dim,2),'&exceed zu(nz)/mask_scale(',dim, &
536	')=',zu(nz)/mask_scale(dim)
537	CALL message( 'init_masks', 'PA0333', 1, 2, 0, 6, 0 )
538	ENDIF
539	ind_array = &
540	MINLOC( ABS( mask_loop(mid,dim,1) * mask_scale(dim) - zu ) )
541	loop_begin = &
542	ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
543	ind_array = &
544	MINLOC( ABS( mask_loop(mid,dim,2) * mask_scale(dim) - zu ) )
545	loop_end = ind_array(1) - 1 + nzb ! MINLOC uses lower array bound 1
546	!
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
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),&
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.'
560	CALL message( 'init_masks', 'PA0334', 0, 1, 0, 6, 0 )
561	ENDIF
562
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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