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source: palm/trunk/SOURCE/subsidence_mod.f90 @ 4429

Last change on this file since 4429 was 4360, checked in by suehring, 5 years ago
Bugfix in output of time-averaged plant-canopy quanities; Output of plant-canopy data only where tall canopy is defined; land-surface model: fix wrong location strings; tests: update urban test case; all source code files: copyright update
Property svn:keywords set to `Id`
File size: 14.1 KB

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1	!> @file subsidence_mod.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! 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 1997-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: subsidence_mod.f90 4360 2020-01-07 11:25:50Z raasch $
27	! Introduction of wall_flags_total_0, which currently sets bits based on static
28	! topography information used in wall_flags_static_0
29	!
30	! 4329 2019-12-10 15:46:36Z motisi
31	! Renamed wall_flags_0 to wall_flags_static_0
32	!
33	! 4182 2019-08-22 15:20:23Z scharf
34	! Corrected "Former revisions" section
35	!
36	! 3655 2019-01-07 16:51:22Z knoop
37	! add subroutine and variable description
38	!
39	! Revision 3.7 2009-12-11 14:15:58Z heinze
40	! Initial revision
41	!
42	! Description:
43	! ------------
44	!> Impact of large-scale subsidence or ascent as tendency term for use
45	!> in the prognostic equation of potential temperature. This enables the
46	!> construction of a constant boundary layer height z_i with time.
47	!-----------------------------------------------------------------------------!
48	MODULE subsidence_mod
49
50
51
52	IMPLICIT NONE
53
54	PRIVATE
55	PUBLIC init_w_subsidence, subsidence
56
57	INTERFACE init_w_subsidence
58	MODULE PROCEDURE init_w_subsidence
59	END INTERFACE init_w_subsidence
60
61	INTERFACE subsidence
62	MODULE PROCEDURE subsidence
63	MODULE PROCEDURE subsidence_ij
64	END INTERFACE subsidence
65
66	CONTAINS
67
68	!------------------------------------------------------------------------------!
69	! Description:
70	! ------------
71	!> Initialize vertical subsidence velocity w_subs.
72	!------------------------------------------------------------------------------!
73	SUBROUTINE init_w_subsidence
74
75	USE arrays_3d, &
76	ONLY: dzu, w_subs, zu
77
78	USE control_parameters, &
79	ONLY: message_string, ocean_mode, subs_vertical_gradient, &
80	subs_vertical_gradient_level, subs_vertical_gradient_level_i
81
82	USE indices, &
83	ONLY: nzb, nzt
84
85	USE kinds
86
87	IMPLICIT NONE
88
89	INTEGER(iwp) :: i !< loop index
90	INTEGER(iwp) :: k !< loop index
91
92	REAL(wp) :: gradient !< vertical gradient of subsidence velocity
93	REAL(wp) :: ws_surface !< subsidence velocity at the surface
94
95	IF ( .NOT. ALLOCATED( w_subs ) ) THEN
96	ALLOCATE( w_subs(nzb:nzt+1) )
97	w_subs = 0.0_wp
98	ENDIF
99
100	IF ( ocean_mode ) THEN
101	message_string = 'applying large scale vertical motion is not ' // &
102	'allowed for ocean mode'
103	CALL message( 'init_w_subsidence', 'PA0324', 2, 2, 0, 6, 0 )
104	ENDIF
105
106	!
107	!-- Compute the profile of the subsidence/ascent velocity
108	!-- using the given gradients
109	i = 1
110	gradient = 0.0_wp
111	ws_surface = 0.0_wp
112
113
114	subs_vertical_gradient_level_i(1) = 0
115	DO k = 1, nzt+1
116	IF ( i < 11 ) THEN
117	IF ( subs_vertical_gradient_level(i) < zu(k) .AND. &
118	subs_vertical_gradient_level(i) >= 0.0_wp ) THEN
119	gradient = subs_vertical_gradient(i) / 100.0_wp
120	subs_vertical_gradient_level_i(i) = k - 1
121	i = i + 1
122	ENDIF
123	ENDIF
124	IF ( gradient /= 0.0_wp ) THEN
125	IF ( k /= 1 ) THEN
126	w_subs(k) = w_subs(k-1) + dzu(k) * gradient
127	ELSE
128	w_subs(k) = ws_surface + 0.5_wp * dzu(k) * gradient
129	ENDIF
130	ELSE
131	w_subs(k) = w_subs(k-1)
132	ENDIF
133	ENDDO
134
135	!
136	!-- In case of no given gradients for the subsidence/ascent velocity,
137	!-- choose zero gradient
138	IF ( subs_vertical_gradient_level(1) == -9999999.9_wp ) THEN
139	subs_vertical_gradient_level(1) = 0.0_wp
140	ENDIF
141
142	END SUBROUTINE init_w_subsidence
143
144
145	!------------------------------------------------------------------------------!
146	! Description:
147	! ------------
148	!> Add effect of large-scale subsidence to variable.
149	!------------------------------------------------------------------------------!
150	SUBROUTINE subsidence( tendency, var, var_init, ls_index )
151
152	USE arrays_3d, &
153	ONLY: ddzu, w_subs
154
155	USE control_parameters, &
156	ONLY: dt_3d, intermediate_timestep_count, large_scale_forcing, &
157	scalar_rayleigh_damping
158
159	USE indices, &
160	ONLY: nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzt, &
161	wall_flags_total_0
162
163	USE kinds
164
165	USE statistics, &
166	ONLY: sums_ls_l, weight_substep
167
168	IMPLICIT NONE
169
170	INTEGER(iwp) :: i !< loop index
171	INTEGER(iwp) :: j !< loop index
172	INTEGER(iwp) :: k !< loop index
173	INTEGER(iwp) :: ls_index !< index of large-scale subsidence in sums_ls_l
174
175	REAL(wp) :: tmp_tend !< temporary tendency
176	REAL(wp) :: tmp_grad !< temporary gradient
177
178	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< variable where to add subsidence
179	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !< tendency of var
180	REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !< initialization profile of var
181	REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !< modified profile of var
182
183	var_mod = var_init
184
185	!
186	!-- Influence of w_subsidence on the current tendency term
187	DO i = nxl, nxr
188	DO j = nys, nyn
189
190	DO k = nzb+1, nzt
191	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
192	tmp_tend = - w_subs(k) * &
193	( var(k+1,j,i) - var(k,j,i) ) * ddzu(k+1) * &
194	MERGE( 1.0_wp, 0.0_wp, &
195	BTEST( wall_flags_total_0(k,j,i), 0 ) )
196	ELSE ! large-scale ascent
197	tmp_tend = - w_subs(k) * &
198	( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) * &
199	MERGE( 1.0_wp, 0.0_wp, &
200	BTEST( wall_flags_total_0(k,j,i), 0 ) )
201	ENDIF
202
203	tendency(k,j,i) = tendency(k,j,i) + tmp_tend
204
205	IF ( large_scale_forcing ) THEN
206	sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend &
207	* weight_substep(intermediate_timestep_count) &
208	* MERGE( 1.0_wp, 0.0_wp, &
209	BTEST( wall_flags_total_0(k,j,i), 0 ) )
210	ENDIF
211	ENDDO
212
213	IF ( large_scale_forcing ) THEN
214	sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index)
215	ENDIF
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 .AND. &
224	intermediate_timestep_count == 1 ) THEN
225	DO k = nzb, nzt
226	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
227	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
228	( var_init(k+1) - var_init(k) ) * ddzu(k+1)
229	ENDIF
230	ENDDO
231	!
232	!-- At the upper boundary, the initial profile is shifted with aid of
233	!-- the gradient tmp_grad. (This is ok if the gradients are linear.)
234	IF ( w_subs(nzt) < 0.0_wp ) THEN
235	tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1)
236	var_mod(nzt+1) = var_init(nzt+1) - &
237	dt_3d * w_subs(nzt+1) * tmp_grad
238	ENDIF
239
240
241	DO k = nzt+1, nzb+1, -1
242	IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent
243	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
244	( var_init(k) - var_init(k-1) ) * ddzu(k)
245	ENDIF
246	ENDDO
247	!
248	!-- At the lower boundary shifting is not necessary because the
249	!-- subsidence velocity w_subs(nzb) vanishes.
250	IF ( w_subs(nzb+1) >= 0.0_wp ) THEN
251	var_mod(nzb) = var_init(nzb)
252	ENDIF
253
254	var_init = var_mod
255	ENDIF
256
257
258	END SUBROUTINE subsidence
259
260	!------------------------------------------------------------------------------!
261	! Description:
262	! ------------
263	!> Add effect of large-scale subsidence to variable.
264	!------------------------------------------------------------------------------!
265	SUBROUTINE subsidence_ij( i, j, tendency, var, var_init, ls_index )
266
267	USE arrays_3d, &
268	ONLY: ddzu, w_subs
269
270	USE control_parameters, &
271	ONLY: dt_3d, intermediate_timestep_count, large_scale_forcing, &
272	scalar_rayleigh_damping
273
274	USE indices, &
275	ONLY: nxl, nxlg, nxrg, nyng, nys, nysg, nzb, nzt, &
276	wall_flags_total_0
277
278	USE kinds
279
280	USE statistics, &
281	ONLY: sums_ls_l, weight_substep
282
283	IMPLICIT NONE
284
285	INTEGER(iwp) :: i !< loop variable
286	INTEGER(iwp) :: j !< loop variable
287	INTEGER(iwp) :: k !< loop variable
288	INTEGER(iwp) :: ls_index !< index of large-scale subsidence in sums_ls_l
289
290	REAL(wp) :: tmp_tend !< temporary tendency
291	REAL(wp) :: tmp_grad !< temporary gradient
292
293	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: var !< variable where to add subsidence
294	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,nxlg:nxrg) :: tendency !< tendency of var
295	REAL(wp), DIMENSION(nzb:nzt+1) :: var_init !< initialization profile of var
296	REAL(wp), DIMENSION(nzb:nzt+1) :: var_mod !< modified profile of var
297
298	var_mod = var_init
299
300	!
301	!-- Influence of w_subsidence on the current tendency term
302	DO k = nzb+1, nzt
303	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
304	tmp_tend = - w_subs(k) * ( var(k+1,j,i) - var(k,j,i) ) &
305	* ddzu(k+1) &
306	* MERGE( 1.0_wp, 0.0_wp, &
307	BTEST( wall_flags_total_0(k,j,i), 0 ) )
308	ELSE ! large-scale ascent
309	tmp_tend = - w_subs(k) * ( var(k,j,i) - var(k-1,j,i) ) * ddzu(k) &
310	* MERGE( 1.0_wp, 0.0_wp, &
311	BTEST( wall_flags_total_0(k,j,i), 0 ) )
312	ENDIF
313
314	tendency(k,j,i) = tendency(k,j,i) + tmp_tend
315
316	IF ( large_scale_forcing ) THEN
317	sums_ls_l(k,ls_index) = sums_ls_l(k,ls_index) + tmp_tend &
318	* weight_substep(intermediate_timestep_count)&
319	* MERGE( 1.0_wp, 0.0_wp, &
320	BTEST( wall_flags_total_0(k,j,i), 0 ) )
321	ENDIF
322	ENDDO
323
324	IF ( large_scale_forcing ) THEN
325	sums_ls_l(nzt+1,ls_index) = sums_ls_l(nzt,ls_index)
326	ENDIF
327
328	!
329	!-- Shifting of the initial profile is especially necessary with Rayleigh
330	!-- damping switched on
331	IF ( scalar_rayleigh_damping .AND. &
332	intermediate_timestep_count == 1 ) THEN
333	IF ( i == nxl .AND. j == nys ) THEN ! shifting only once per PE
334
335	DO k = nzb, nzt
336	IF ( w_subs(k) < 0.0_wp ) THEN ! large-scale subsidence
337	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
338	( var_init(k+1) - var_init(k) ) * ddzu(k+1)
339	ENDIF
340	ENDDO
341	!
342	!-- At the upper boundary, the initial profile is shifted with aid of
343	!-- the gradient tmp_grad. (This is ok if the gradients are linear.)
344	IF ( w_subs(nzt) < 0.0_wp ) THEN
345	tmp_grad = ( var_init(nzt+1) - var_init(nzt) ) * ddzu(nzt+1)
346	var_mod(nzt+1) = var_init(nzt+1) - &
347	dt_3d * w_subs(nzt+1) * tmp_grad
348	ENDIF
349
350
351	DO k = nzt+1, nzb+1, -1
352	IF ( w_subs(k) >= 0.0_wp ) THEN ! large-scale ascent
353	var_mod(k) = var_init(k) - dt_3d * w_subs(k) * &
354	( var_init(k) - var_init(k-1) ) * ddzu(k)
355	ENDIF
356	ENDDO
357	!
358	!-- At the lower boundary shifting is not necessary because the
359	!-- subsidence velocity w_subs(nzb) vanishes.
360	IF ( w_subs(nzb+1) >= 0.0_wp ) THEN
361	var_mod(nzb) = var_init(nzb)
362	ENDIF
363
364	var_init = var_mod
365
366	ENDIF
367	ENDIF
368
369	END SUBROUTINE subsidence_ij
370
371
372	END MODULE subsidence_mod

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