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top_bound_p.F @ 4794

Last change on this file since 4794 was 1910, checked in by Laurent Fairhead, 11 years ago
Merged trunk changes r1860:1909 into testing branch
Property copyright set to Name of program: LMDZ Creation date: 1984 Version: LMDZ5 License: CeCILL version 2 Holder: Laboratoire de m\'et\'eorologie dynamique, CNRS, UMR 8539 See the license file in the root directory Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 7.1 KB

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1	!
2	! $Id: top_bound_p.F 1910 2013-11-29 08:40:25Z nfevrier $
3	!
4	SUBROUTINE top_bound_p(vcov,ucov,teta,masse,dt)
5	USE parallel_lmdz
6	IMPLICIT NONE
7	c
8	#include "dimensions.h"
9	#include "paramet.h"
10	#include "comconst.h"
11	#include "comvert.h"
12	#include "comgeom2.h"
13
14
15	c .. DISSIPATION LINEAIRE A HAUT NIVEAU, RUN MESO,
16	C F. LOTT DEC. 2006
17	c ( 10/12/06 )
18
19	c=======================================================================
20	c
21	c Auteur: F. LOTT
22	c -------
23	c
24	c Objet:
25	c ------
26	c
27	c Dissipation linéaire (ex top_bound de la physique)
28	c
29	c=======================================================================
30
31	! top_bound sponge layer model:
32	! Quenching is modeled as: A(t)=Am+A0exp(-lambdat)
33	! where Am is the zonal average of the field (or zero), and lambda the inverse
34	! of the characteristic quenching/relaxation time scale
35	! Thus, assuming Am to be time-independent, field at time t+dt is given by:
36	! A(t+dt)=A(t)-(A(t)-Am)(1-exp(-lambdat))
37	! Moreover lambda can be a function of model level (see below), and relaxation
38	! can be toward the average zonal field or just zero (see below).
39
40	! NB: top_bound sponge is only called from leapfrog if ok_strato=.true.
41
42	! sponge parameters: (loaded/set in conf_gcm.F ; stored in comconst.h)
43	! iflag_top_bound=0 for no sponge
44	! iflag_top_bound=1 for sponge over 4 topmost layers
45	! iflag_top_bound=2 for sponge from top to ~1% of top layer pressure
46	! mode_top_bound=0: no relaxation
47	! mode_top_bound=1: u and v relax towards 0
48	! mode_top_bound=2: u and v relax towards their zonal mean
49	! mode_top_bound=3: u,v and pot. temp. relax towards their zonal mean
50	! tau_top_bound : inverse of charactericstic relaxation time scale at
51	! the topmost layer (Hz)
52
53
54	#include "comdissipn.h"
55	#include "iniprint.h"
56
57	c Arguments:
58	c ----------
59
60	real,intent(inout) :: ucov(iip1,jjp1,llm) ! covariant zonal wind
61	real,intent(inout) :: vcov(iip1,jjm,llm) ! covariant meridional wind
62	real,intent(inout) :: teta(iip1,jjp1,llm) ! potential temperature
63	real,intent(in) :: masse(iip1,jjp1,llm) ! mass of atmosphere
64	real,intent(in) :: dt ! time step (s) of sponge model
65
66	c Local:
67	c ------
68	REAL massebx(iip1,jjp1,llm),masseby(iip1,jjm,llm),zm
69	REAL uzon(jjp1,llm),vzon(jjm,llm),tzon(jjp1,llm)
70
71	integer i
72	REAL,SAVE :: rdamp(llm) ! quenching coefficient
73	real,save :: lambda(llm) ! inverse or quenching time scale (Hz)
74	LOGICAL,SAVE :: first=.true.
75	INTEGER j,l,jjb,jje
76
77
78	if (iflag_top_bound == 0) return
79
80	if (first) then
81	c$OMP BARRIER
82	c$OMP MASTER
83	if (iflag_top_bound == 1) then
84	! sponge quenching over the topmost 4 atmospheric layers
85	lambda(:)=0.
86	lambda(llm)=tau_top_bound
87	lambda(llm-1)=tau_top_bound/2.
88	lambda(llm-2)=tau_top_bound/4.
89	lambda(llm-3)=tau_top_bound/8.
90	else if (iflag_top_bound == 2) then
91	! sponge quenching over topmost layers down to pressures which are
92	! higher than 100 times the topmost layer pressure
93	lambda(:)=tau_top_bound
94	s *max(presnivs(llm)/presnivs(:)-0.01,0.)
95	endif
96
97	! quenching coefficient rdamp(:)
98	! rdamp(:)=dt*lambda(:) ! Explicit Euler approx.
99	rdamp(:)=1.-exp(-lambda(:)*dt)
100
101	write(lunout,*)'TOP_BOUND mode',mode_top_bound
102	write(lunout,*)'Sponge layer coefficients'
103	write(lunout,*)'p (Pa) z(km) tau(s) 1./tau (Hz)'
104	do l=1,llm
105	if (rdamp(l).ne.0.) then
106	write(lunout,'(6(1pe12.4,1x))')
107	& presnivs(l),log(preff/presnivs(l))*scaleheight,
108	& 1./lambda(l),lambda(l)
109	endif
110	enddo
111	first=.false.
112	c$OMP END MASTER
113	c$OMP BARRIER
114	endif ! of if (first)
115
116
117	CALL massbar_p(masse,massebx,masseby)
118
119	! compute zonal average of vcov (or set it to zero)
120	if (mode_top_bound.ge.2) then
121	jjb=jj_begin
122	jje=jj_end
123	IF (pole_sud) jje=jj_end-1
124	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
125	do l=1,llm
126	do j=jjb,jje
127	zm=0.
128	vzon(j,l)=0
129	do i=1,iim
130	! NB: we can work using vcov zonal mean rather than v since the
131	! cv coefficient (which relates the two) only varies with latitudes
132	vzon(j,l)=vzon(j,l)+vcov(i,j,l)*masseby(i,j,l)
133	zm=zm+masseby(i,j,l)
134	enddo
135	vzon(j,l)=vzon(j,l)/zm
136	enddo
137	enddo
138	c$OMP END DO NOWAIT
139	else
140	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
141	do l=1,llm
142	vzon(:,l)=0.
143	enddo
144	c$OMP END DO NOWAIT
145	endif ! of if (mode_top_bound.ge.2)
146
147	! compute zonal average of u (or set it to zero)
148	if (mode_top_bound.ge.2) then
149	jjb=jj_begin
150	jje=jj_end
151	IF (pole_nord) jjb=jj_begin+1
152	IF (pole_sud) jje=jj_end-1
153	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
154	do l=1,llm
155	do j=jjb,jje
156	uzon(j,l)=0.
157	zm=0.
158	do i=1,iim
159	uzon(j,l)=uzon(j,l)+massebx(i,j,l)*ucov(i,j,l)/cu(i,j)
160	zm=zm+massebx(i,j,l)
161	enddo
162	uzon(j,l)=uzon(j,l)/zm
163	enddo
164	enddo
165	c$OMP END DO NOWAIT
166	else
167	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
168	do l=1,llm
169	uzon(:,l)=0.
170	enddo
171	c$OMP END DO NOWAIT
172	endif ! of if (mode_top_bound.ge.2)
173
174	! compute zonal average of potential temperature, if necessary
175	if (mode_top_bound.ge.3) then
176	jjb=jj_begin
177	jje=jj_end
178	IF (pole_nord) jjb=jj_begin+1
179	IF (pole_sud) jje=jj_end-1
180	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
181	do l=1,llm
182	do j=jjb,jje
183	zm=0.
184	tzon(j,l)=0.
185	do i=1,iim
186	tzon(j,l)=tzon(j,l)+teta(i,j,l)*masse(i,j,l)
187	zm=zm+masse(i,j,l)
188	enddo
189	tzon(j,l)=tzon(j,l)/zm
190	enddo
191	enddo
192	c$OMP END DO NOWAIT
193	endif ! of if (mode_top_bound.ge.3)
194
195	if (mode_top_bound.ge.1) then
196	! Apply sponge quenching on vcov:
197	jjb=jj_begin
198	jje=jj_end
199	IF (pole_sud) jje=jj_end-1
200
201	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
202	do l=1,llm
203	do j=jjb,jje
204	do i=1,iip1
205	vcov(i,j,l)=vcov(i,j,l)
206	& -rdamp(l)*(vcov(i,j,l)-vzon(j,l))
207	enddo
208	enddo
209	enddo
210	c$OMP END DO NOWAIT
211
212	! Apply sponge quenching on ucov:
213	jjb=jj_begin
214	jje=jj_end
215	IF (pole_nord) jjb=jj_begin+1
216	IF (pole_sud) jje=jj_end-1
217
218	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
219	do l=1,llm
220	do j=jjb,jje
221	do i=1,iip1
222	ucov(i,j,l)=ucov(i,j,l)
223	& -rdamp(l)(ucov(i,j,l)-cu(i,j)uzon(j,l))
224	enddo
225	enddo
226	enddo
227	c$OMP END DO NOWAIT
228	endif ! of if (mode_top_bound.ge.1)
229
230	if (mode_top_bound.ge.3) then
231	! Apply sponge quenching on teta:
232	jjb=jj_begin
233	jje=jj_end
234	IF (pole_nord) jjb=jj_begin+1
235	IF (pole_sud) jje=jj_end-1
236
237	c$OMP DO SCHEDULE(STATIC,OMP_CHUNK)
238	do l=1,llm
239	do j=jjb,jje
240	do i=1,iip1
241	teta(i,j,l)=teta(i,j,l)
242	& -rdamp(l)*(teta(i,j,l)-tzon(j,l))
243	enddo
244	enddo
245	enddo
246	c$OMP END DO NOWAIT
247	endif ! of if (mode_top_bond.ge.3)
248
249	END

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