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source: palm/trunk/SOURCE/subsidence.f90 @ 1576

Last change on this file since 1576 was 1490, checked in by raasch, 10 years ago
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1	MODULE subsidence_mod
2
3	!--------------------------------------------------------------------------------!
4	! This file is part of PALM.
5	!
6	! PALM is free software: you can redistribute it and/or modify it under the terms
7	! of the GNU General Public License as published by the Free Software Foundation,
8	! either version 3 of the License, or (at your option) any later version.
9	!
10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
13	!
14	! You should have received a copy of the GNU General Public License along with
15	! PALM. If not, see <http://www.gnu.org/licenses/>.
16	!
17	! Copyright 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: subsidence.f90 1490 2014-10-30 08:10:16Z raasch $
27	!
28	! 1489 2014-10-30 08:09:12Z raasch
29	! bugfix: sums_ls_l can only be used if large_scale_forcing is switched on
30	!
31	! 1382 2014-04-30 12:15:41Z boeske
32	! Changed the weighting factor that is used in the summation of subsidence
33	! tendencies for profile data output from weight_pres to weight_substep
34	! added Neumann boundary conditions for profile data output of subsidence terms
35	! at nzt+1
36	!
37	! 1380 2014-04-28 12:40:45Z heinze
38	! Shifting only necessary in case of scalar Rayleigh damping
39	!
40	! 1365 2014-04-22 15:03:56Z boeske
41	! Summation of subsidence tendencies for data output added
42	! +ls_index, sums_ls_l, tmp_tend
43	!
44	! 1353 2014-04-08 15:21:23Z heinze
45	! REAL constants provided with KIND-attribute
46	!
47	! 1320 2014-03-20 08:40:49Z raasch
48	! ONLY-attribute added to USE-statements,
49	! kind-parameters added to all INTEGER and REAL declaration statements,
50	! kinds are defined in new module kinds,
51	! old module precision_kind is removed,
52	! revision history before 2012 removed,
53	! comment fields (!:) to be used for variable explanations added to
54	! all variable declaration statements
55	!
56	! 1036 2012-10-22 13:43:42Z raasch
57	! code put under GPL (PALM 3.9)
58	!
59	! Revision 3.7 2009-12-11 14:15:58Z heinze
60	! Initial revision
61	!
62	! Description:
63	! ------------
64	! Impact of large-scale subsidence or ascent as tendency term for use
65	! in the prognostic equation of potential temperature. This enables the
66	! construction of a constant boundary layer height z_i with time.
67	!-----------------------------------------------------------------------------!
68
69
70	IMPLICIT NONE
71
72	PRIVATE
73	PUBLIC init_w_subsidence, subsidence
74
75	INTERFACE init_w_subsidence
76	MODULE PROCEDURE init_w_subsidence
77	END INTERFACE init_w_subsidence
78
79	INTERFACE subsidence
80	MODULE PROCEDURE subsidence
81	MODULE PROCEDURE subsidence_ij
82	END INTERFACE subsidence
83
84	CONTAINS
85
86	SUBROUTINE init_w_subsidence
87
88	USE arrays_3d, &
89	ONLY: dzu, w_subs, zu
90
91	USE control_parameters, &
92	ONLY: message_string, ocean, subs_vertical_gradient, &
93	subs_vertical_gradient_level, subs_vertical_gradient_level_i
94
95	USE indices, &
96	ONLY: nzb, nzt
97
98	USE kinds
99
100	IMPLICIT NONE
101
102	INTEGER(iwp) :: i !:
103	INTEGER(iwp) :: k !:
104
105	REAL(wp) :: gradient !:
106	REAL(wp) :: ws_surface !:
107
108	IF ( .NOT. ALLOCATED( w_subs )) THEN
109	ALLOCATE( w_subs(nzb:nzt+1) )
110	w_subs = 0.0_wp
111	ENDIF
112
113	IF ( ocean ) THEN
114	message_string = 'Applying large scale vertical motion is not ' // &
115	'allowed for ocean runs'
116	CALL message( 'init_w_subsidence', 'PA0324', 2, 2, 0, 6, 0 )
117	ENDIF
118
119	!
120	!-- Compute the profile of the subsidence/ascent velocity
121	!-- using the given gradients
122	i = 1
123	gradient = 0.0_wp
124	ws_surface = 0.0_wp
125
126
127	subs_vertical_gradient_level_i(1) = 0
128	DO k = 1, nzt+1
129	IF ( i < 11 ) THEN
130	IF ( subs_vertical_gradient_level(i) < zu(k) .AND. &
131	subs_vertical_gradient_level(i) >= 0.0_wp ) THEN
132	gradient = subs_vertical_gradient(i) / 100.0_wp
133	subs_vertical_gradient_level_i(i) = k - 1
134	i = i + 1
135	ENDIF
136	ENDIF
137	IF ( gradient /= 0.0_wp ) THEN
138	IF ( k /= 1 ) THEN
139	w_subs(k) = w_subs(k-1) + dzu(k) * gradient
140	ELSE
141	w_subs(k) = ws_surface + 0.5_wp * dzu(k) * gradient
142	ENDIF
143	ELSE
144	w_subs(k) = w_subs(k-1)
145	ENDIF
146	ENDDO
147
148	!
149	!-- In case of no given gradients for the subsidence/ascent velocity,
150	!-- choose zero gradient
151	IF ( subs_vertical_gradient_level(1) == -9999999.9_wp ) THEN
152	subs_vertical_gradient_level(1) = 0.0_wp
153	ENDIF
154
155	END SUBROUTINE init_w_subsidence
156
157
158	SUBROUTINE subsidence( tendency, var, var_init, ls_index )
159
160	USE arrays_3d, &
161	ONLY: ddzu, w_subs
162
163	USE control_parameters, &
164	ONLY: dt_3d, intermediate_timestep_count, large_scale_forcing, &
165	scalar_rayleigh_damping
166
167	USE indices, &
168	ONLY: nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzb_s_inner,&
169	nzt
170
171	USE kinds
172
173	USE statistics, &
174	ONLY: sums_ls_l, weight_substep
175
176	IMPLICIT NONE
177
178	INTEGER(iwp) :: i !:
179	INTEGER(iwp) :: j !:
180	INTEGER(iwp) :: k !:
181	INTEGER(iwp) :: ls_index !:
182
183	REAL(wp) :: tmp_tend !:
184	REAL(wp) :: tmp_grad !:
185
186	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !:
187	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !:
188	REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !:
189	REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !:
190
191	var_mod = var_init
192
193	!
194	!-- Influence of w_subsidence on the current tendency term
195	DO i = nxl, nxr
196	DO j = nys, nyn
197
198	DO k = nzb_s_inner(j,i)+1, nzt
199	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
200	tmp_tend = - w_subs(k) * &
201	( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1)
202	ELSE ! large-scale ascent
203	tmp_tend = - w_subs(k) * &
204	( var(k,j,i) - var(k-1,j,i) ) * ddzu(k)
205	ENDIF
206
207	tendency(k,j,i) = tendency(k,j,i) + tmp_tend
208
209	IF ( large_scale_forcing ) THEN
210	sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend &
211	* weight_substep(intermediate_timestep_count)
212	ENDIF
213	ENDDO
214
215	sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index)
216
217	ENDDO
218	ENDDO
219
220	!
221	!-- Shifting of the initial profile is especially necessary with Rayleigh
222	!-- damping switched on
223	IF ( scalar_rayleigh_damping ) THEN
224	DO k = nzb, nzt
225	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
226	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
227	( var_init(k+1) - var_init(k) ) * ddzu(k+1)
228	ENDIF
229	ENDDO
230	!
231	!-- At the upper boundary, the initial profile is shifted with aid of
232	!-- the gradient tmp_grad. (This is ok if the gradients are linear.)
233	IF ( w_subs(nzt) < 0.0_wp ) THEN
234	tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1)
235	var_mod(nzt+1) = var_init(nzt+1) - &
236	dt_3d * w_subs(nzt+1) * tmp_grad
237	ENDIF
238
239
240	DO k = nzt+1, nzb+1, -1
241	IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent
242	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
243	( var_init(k) - var_init(k-1) ) * ddzu(k)
244	ENDIF
245	ENDDO
246	!
247	!-- At the lower boundary shifting is not necessary because the
248	!-- subsidence velocity w_subs(nzb) vanishes.
249	IF ( w_subs(nzb+1) >= 0.0_wp ) THEN
250	var_mod(nzb) = var_init(nzb)
251	ENDIF
252
253	var_init = var_mod
254	ENDIF
255
256
257	END SUBROUTINE subsidence
258
259	SUBROUTINE subsidence_ij( i, j, tendency, var, var_init, ls_index )
260
261	USE arrays_3d, &
262	ONLY: ddzu, w_subs
263
264	USE control_parameters, &
265	ONLY: dt_3d, intermediate_timestep_count, large_scale_forcing, &
266	scalar_rayleigh_damping
267
268	USE indices, &
269	ONLY: nxl, nxlg, nxrg, nyng, nys, nysg, nzb_s_inner, nzb, nzt
270
271	USE kinds
272
273	USE statistics, &
274	ONLY: sums_ls_l, weight_substep
275
276	IMPLICIT NONE
277
278	INTEGER(iwp) :: i !:
279	INTEGER(iwp) :: j !:
280	INTEGER(iwp) :: k !:
281	INTEGER(iwp) :: ls_index !:
282
283	REAL(wp) :: tmp_tend !:
284	REAL(wp) :: tmp_grad !:
285
286	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !:
287	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !:
288	REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !:
289	REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !:
290
291	var_mod = var_init
292
293	!
294	!-- Influence of w_subsidence on the current tendency term
295	DO k = nzb_s_inner(j,i)+1, nzt
296	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
297	tmp_tend = - w_subs(k) * ( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1)
298	ELSE ! large-scale ascent
299	tmp_tend = - w_subs(k) * ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k)
300	ENDIF
301
302	tendency(k,j,i) = tendency(k,j,i) + tmp_tend
303
304	IF ( large_scale_forcing ) THEN
305	sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend &
306	* weight_substep(intermediate_timestep_count)
307	ENDIF
308	ENDDO
309
310	IF ( large_scale_forcing ) THEN
311	sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index)
312	ENDIF
313
314	!
315	!-- Shifting of the initial profile is especially necessary with Rayleigh
316	!-- damping switched on
317	IF ( scalar_rayleigh_damping ) THEN
318	IF ( i == nxl .AND. j == nys ) THEN ! shifting only once per PE
319
320	DO k = nzb, nzt
321	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
322	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
323	( var_init(k+1) - var_init(k) ) * ddzu(k+1)
324	ENDIF
325	ENDDO
326	!
327	!-- At the upper boundary, the initial profile is shifted with aid of
328	!-- the gradient tmp_grad. (This is ok if the gradients are linear.)
329	IF ( w_subs(nzt) < 0.0_wp ) THEN
330	tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1)
331	var_mod(nzt+1) = var_init(nzt+1) - &
332	dt_3d * w_subs(nzt+1) * tmp_grad
333	ENDIF
334
335
336	DO k = nzt+1, nzb+1, -1
337	IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent
338	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
339	( var_init(k) - var_init(k-1) ) * ddzu(k)
340	ENDIF
341	ENDDO
342	!
343	!-- At the lower boundary shifting is not necessary because the
344	!-- subsidence velocity w_subs(nzb) vanishes.
345	IF ( w_subs(nzb+1) >= 0.0_wp ) THEN
346	var_mod(nzb) = var_init(nzb)
347	ENDIF
348
349	var_init = var_mod
350
351	ENDIF
352	ENDIF
353
354	END SUBROUTINE subsidence_ij
355
356
357	END MODULE subsidence_mod

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