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source: palm/trunk/SOURCE/surface_coupler.f90 @ 683

Last change on this file since 683 was 668, checked in by suehring, 14 years ago
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1	SUBROUTINE surface_coupler
2
3	!------------------------------------------------------------------------------!
4	! Current revisions:
5	! -----------------
6	!
7	! Former revisions:
8	! ------------------
9	! $Id: surface_coupler.f90 668 2010-12-23 13:22:58Z raasch $
10	!
11	! 667 2010-12-23 12:06:00Z suehring/gryschka
12	! additional case for nonequivalent processor and grid topopolgy in ocean and
13	! atmosphere added (coupling_topology = 1)
14	! Added exchange of u and v from Ocean to Atmosphere
15	!
16	! 291 2009-04-16 12:07:26Z raasch
17	! Coupling with independent precursor runs.
18	! Output of messages replaced by message handling routine.
19	!
20	! 206 2008-10-13 14:59:11Z raasch
21	! Implementation of a MPI-1 Coupling: replaced myid with target_id,
22	! deleted __mpi2 directives
23	!
24	! 109 2007-08-28 15:26:47Z letzel
25	! Initial revision
26	!
27	! Description:
28	! ------------
29	! Data exchange at the interface between coupled models
30	!------------------------------------------------------------------------------!
31
32	USE arrays_3d
33	USE control_parameters
34	USE cpulog
35	USE grid_variables
36	USE indices
37	USE interfaces
38	USE pegrid
39
40	IMPLICIT NONE
41
42	INTEGER :: i, j, k
43
44	REAL :: time_since_reference_point_rem
45	REAL :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
46
47	#if defined( __parallel )
48
49	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
50
51
52
53	!
54	!-- In case of model termination initiated by the remote model
55	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
56	!-- The rest of the coupler must then be skipped because it would cause an MPI
57	!-- intercomminucation hang.
58	!-- If necessary, the coupler will be called at the beginning of the next
59	!-- restart run.
60
61	IF ( coupling_topology == 0 ) THEN
62	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
63	0, &
64	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
65	0, comm_inter, status, ierr )
66	ELSE
67	IF ( myid == 0) THEN
68	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
69	target_id, 0, &
70	terminate_coupled_remote, 1, MPI_INTEGER, &
71	target_id, 0, &
72	comm_inter, status, ierr )
73	ENDIF
74	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, ierr)
75
76	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
77	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
78
79	ENDIF
80
81	IF ( terminate_coupled_remote > 0 ) THEN
82	WRITE( message_string, * ) 'remote model "', &
83	TRIM( coupling_mode_remote ), &
84	'" terminated', &
85	'&with terminate_coupled_remote = ', &
86	terminate_coupled_remote, &
87	'&local model "', TRIM( coupling_mode ), &
88	'" has', &
89	'&terminate_coupled = ', &
90	terminate_coupled
91	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
92	RETURN
93	ENDIF
94
95
96	!
97	!-- Exchange the current simulated time between the models,
98	!-- currently just for total_2ding
99	IF ( coupling_topology == 0 ) THEN
100	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, &
101	target_id, 11, comm_inter, ierr )
102	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
103	target_id, 11, comm_inter, status, ierr )
104	ELSE
105	IF ( myid == 0 ) THEN
106	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, &
107	target_id, 11, comm_inter, ierr )
108	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
109	target_id, 11, comm_inter, status, ierr )
110	ENDIF
111	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, &
112	0, comm2d, ierr )
113	ENDIF
114	WRITE ( 9, * ) 'simulated time: ', simulated_time
115	WRITE ( 9, * ) 'time since start of coupling: ', &
116	time_since_reference_point, ' remote: ', &
117	time_since_reference_point_rem
118	CALL local_flush( 9 )
119
120
121	!
122	!-- Exchange the interface data
123	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
124
125	!
126	!-- Horizontal grid size and number of processors is equal
127	!-- in ocean and atmosphere
128	IF ( coupling_topology == 0 ) THEN
129
130	!
131	!-- Send heat flux at bottom surface to the ocean model
132	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, &
133	target_id, 12, comm_inter, ierr )
134
135	!
136	!-- Send humidity flux at bottom surface to the ocean model
137	IF ( humidity ) THEN
138	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, &
139	target_id, 13, comm_inter, ierr )
140	ENDIF
141
142	!
143	!-- Receive temperature at the bottom surface from the ocean model
144	WRITE ( 9, * ) '*** receive pt from ocean'
145	CALL local_flush( 9 )
146	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, &
147	target_id, 14, comm_inter, status, ierr )
148
149	!
150	!-- Send the momentum flux (u) at bottom surface to the ocean model
151	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, &
152	target_id, 15, comm_inter, ierr )
153
154	!
155	!-- Send the momentum flux (v) at bottom surface to the ocean model
156	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, &
157	target_id, 16, comm_inter, ierr )
158
159	!
160	!-- Receive u at the bottom surface from the ocean model
161	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, &
162	target_id, 17, comm_inter, status, ierr )
163
164	!
165	!-- Receive v at the bottom surface from the ocean model
166	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, &
167	target_id, 18, comm_inter, status, ierr )
168
169	!
170	!-- Horizontal grid size or number of processors differs between
171	!-- ocean and atmosphere
172	ELSE
173
174	!
175	!-- Send heat flux at bottom surface to the ocean model
176	total_2d_a = 0.0
177	total_2d = 0.0
178	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
179	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
180	MPI_SUM, 0, comm2d, ierr )
181	CALL interpolate_to_ocean(12)
182
183	!
184	!-- Send humidity flux at bottom surface to the ocean model
185	IF ( humidity ) THEN
186	total_2d_a = 0.0
187	total_2d = 0.0
188	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
189	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
190	MPI_SUM, 0, comm2d, ierr )
191	CALL interpolate_to_ocean(13)
192	ENDIF
193
194	!
195	!-- Receive temperature at the bottom surface from the ocean model
196	IF ( myid == 0 ) THEN
197	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
198	target_id, 14, comm_inter, status, ierr )
199	ENDIF
200	CALL MPI_BARRIER( comm2d, ierr )
201	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
202	0, comm2d, ierr )
203	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
204
205	!
206	!-- Send momentum flux (u) at bottom surface to the ocean model
207	total_2d_a = 0.0
208	total_2d = 0.0
209	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
210	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
211	MPI_SUM, 0, comm2d, ierr )
212	CALL interpolate_to_ocean(15)
213
214	!
215	!-- Send momentum flux (v) at bottom surface to the ocean model
216	total_2d_a = 0.0
217	total_2d = 0.0
218	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
219	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
220	MPI_SUM, 0, comm2d, ierr )
221	CALL interpolate_to_ocean(16)
222
223	!
224	!-- Receive u at the bottom surface from the ocean model
225	IF ( myid == 0 ) THEN
226	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
227	target_id, 17, comm_inter, status, ierr )
228	ENDIF
229	CALL MPI_BARRIER( comm2d, ierr )
230	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
231	0, comm2d, ierr )
232	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
233
234	!
235	!-- Receive v at the bottom surface from the ocean model
236	IF ( myid == 0 ) THEN
237	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
238	target_id, 18, comm_inter, status, ierr )
239	ENDIF
240	CALL MPI_BARRIER( comm2d, ierr )
241	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
242	0, comm2d, ierr )
243	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
244
245	ENDIF
246
247	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
248
249	!
250	!-- Horizontal grid size and number of processors is equal
251	!-- in ocean and atmosphere
252	IF ( coupling_topology == 0 ) THEN
253	!
254	!-- Receive heat flux at the sea surface (top) from the atmosphere model
255	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, &
256	target_id, 12, comm_inter, status, ierr )
257
258
259	!
260	!-- Receive humidity flux from the atmosphere model (bottom)
261	!-- and add it to the heat flux at the sea surface (top)...
262	IF ( humidity_remote ) THEN
263	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
264	target_id, 13, comm_inter, status, ierr )
265
266	ENDIF
267
268	!
269	!-- Send sea surface temperature to the atmosphere model
270	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, &
271	target_id, 14, comm_inter, ierr )
272
273	!
274	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
275	!-- model
276	WRITE ( 9, * ) '*** receive uswst from atmosphere'
277	CALL local_flush( 9 )
278	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, &
279	target_id, 15, comm_inter, status, ierr )
280
281	!
282	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
283	!-- model
284	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, &
285	target_id, 16, comm_inter, status, ierr )
286
287	!-- Send u to the atmosphere model
288	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, &
289	target_id, 17, comm_inter, ierr )
290
291	!
292	!-- Send v to the atmosphere model
293	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, &
294	target_id, 18, comm_inter, ierr )
295
296	!
297	!-- Horizontal gridsize or number of processors differs between
298	!-- ocean and atmosphere
299	ELSE
300
301	!
302	!-- Receive heat flux at the sea surface (top) from the atmosphere model
303	IF ( myid == 0 ) THEN
304	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
305	target_id, 12, comm_inter, status, ierr )
306	ENDIF
307	CALL MPI_BARRIER( comm2d, ierr )
308	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
309	0, comm2d, ierr)
310	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
311
312	!
313	!-- Receive humidity flux at the sea surface (top) from the
314	!-- atmosphere model
315	IF ( humidity_remote ) THEN
316	IF ( myid == 0 ) THEN
317	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
318	target_id, 13, comm_inter, status, ierr )
319	ENDIF
320	CALL MPI_BARRIER( comm2d, ierr )
321	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
322	0, comm2d, ierr)
323	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
324	ENDIF
325
326	!
327	!-- Send surface temperature to atmosphere
328	total_2d_o = 0.0
329	total_2d = 0.0
330	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
331
332	CALL MPI_REDUCE(total_2d, total_2d_o, ngp_o, &
333	MPI_REAL, MPI_SUM, 0, comm2d, ierr)
334
335	CALL interpolate_to_atmos(14)
336
337	!
338	!-- Receive momentum flux (u) at the sea surface (top) from the
339	!-- atmosphere model
340	IF ( myid == 0 ) THEN
341	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
342	target_id, 15, comm_inter, status, ierr )
343	ENDIF
344	CALL MPI_BARRIER( comm2d, ierr )
345	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
346	0, comm2d, ierr)
347	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
348
349	!
350	!-- Receive momentum flux (v) at the sea surface (top) from the
351	!-- atmosphere model
352	IF ( myid == 0 ) THEN
353	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
354	target_id, 16, comm_inter, status, ierr )
355	ENDIF
356	CALL MPI_BARRIER( comm2d, ierr )
357	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
358	0, comm2d, ierr)
359	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
360
361	!
362	!-- Send u to atmosphere
363	total_2d_o = 0.0
364	total_2d = 0.0
365	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
366	CALL MPI_REDUCE(total_2d, total_2d_o, ngp_o, MPI_REAL, &
367	MPI_SUM, 0, comm2d, ierr)
368	CALL interpolate_to_atmos(17)
369
370	!
371	!-- Send v to atmosphere
372	total_2d_o = 0.0
373	total_2d = 0.0
374	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
375	CALL MPI_REDUCE(total_2d, total_2d_o, ngp_o, MPI_REAL, &
376	MPI_SUM, 0, comm2d, ierr)
377	CALL interpolate_to_atmos(18)
378
379	ENDIF
380
381	!
382	!-- Conversions of fluxes received from atmosphere
383	IF ( humidity_remote ) THEN
384	!here tswst is still the sum of atmospheric bottom heat fluxes
385	tswst = tswst + qswst_remote * 2.2626108e6 / 1005.0
386	!*latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
387	!/(rho_atm(=1.0)*c_p)
388	!
389	!-- ...and convert it to a salinity flux at the sea surface (top)
390	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
391	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
392	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
393	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
394	ENDIF
395
396	!
397	!-- Adjust the kinematic heat flux with respect to ocean density
398	!-- (constants are the specific heat capacities for air and water)
399	!-- now tswst is the ocean top heat flux
400	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
401
402	!
403	!-- Adjust the momentum fluxes with respect to ocean density
404	uswst = uswst / rho(nzt,:,:)
405	vswst = vswst / rho(nzt,:,:)
406
407
408	ENDIF
409
410	IF ( coupling_topology == 1 ) THEN
411	DEALLOCATE( total_2d_o, total_2d_a )
412	ENDIF
413
414	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
415
416	#endif
417
418	END SUBROUTINE surface_coupler
419
420
421
422	SUBROUTINE interpolate_to_atmos(tag)
423
424	USE arrays_3d
425	USE control_parameters
426	USE grid_variables
427	USE indices
428	USE pegrid
429
430	IMPLICIT NONE
431
432
433	INTEGER :: dnx, dnx2, dny, dny2, i, ii, j, jj
434	INTEGER, intent(in) :: tag
435
436	CALL MPI_BARRIER( comm2d, ierr )
437
438	IF ( myid == 0 ) THEN
439
440	!
441	!-- cyclic boundary conditions for the total 2D-grid
442	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
443	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
444
445	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
446	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
447
448	!
449	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
450	dnx = (nx_o+1) / (nx_a+1)
451	dny = (ny_o+1) / (ny_a+1)
452
453	!
454	!-- Distance for interpolation around coarse grid points within the fine grid
455	!-- (note: 2*dnx2 must not be equal with dnx)
456	dnx2 = 2 * ( dnx / 2 )
457	dny2 = 2 * ( dny / 2 )
458
459	total_2d_a = 0.0
460	!
461	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
462	DO j = 0, ny_a
463	DO i = 0, nx_a
464	DO jj = 0, dny2
465	DO ii = 0, dnx2
466	total_2d_a(j,i) = total_2d_a(j,i) &
467	+ total_2d_o(jdny+jj,idnx+ii)
468	ENDDO
469	ENDDO
470	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
471	ENDDO
472	ENDDO
473	!
474	!-- cyclic boundary conditions for atmosphere grid
475	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
476	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
477
478	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
479	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
480	!
481	!-- Transfer of the atmosphere-grid-layer to the atmosphere
482	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
483	target_id, tag, comm_inter, ierr )
484
485	ENDIF
486
487	CALL MPI_BARRIER( comm2d, ierr )
488
489	END SUBROUTINE interpolate_to_atmos
490
491
492	SUBROUTINE interpolate_to_ocean(tag)
493
494	USE arrays_3d
495	USE control_parameters
496	USE grid_variables
497	USE indices
498	USE pegrid
499
500	IMPLICIT NONE
501
502	REAL :: fl, fr, myl, myr
503	INTEGER :: dnx, dny, i, ii, j, jj
504	INTEGER, intent(in) :: tag
505
506	CALL MPI_BARRIER( comm2d, ierr )
507
508	IF ( myid == 0 ) THEN
509
510	!
511	! Number of gridpoints of the fine grid within one mesh of the coarse grid
512	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
513	dny = ( ny_o + 1 ) / ( ny_a + 1 )
514
515	!
516	!-- cyclic boundary conditions for atmosphere grid
517	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
518	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
519
520	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
521	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
522	!
523	!-- Bilinear Interpolation from atmosphere-grid-layer to ocean-grid-layer
524	DO j = 0, ny
525	DO i = 0, nx
526	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
527	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
528	DO jj = 0, dny-1
529	fl = myl*jj + total_2d_a(j,i)
530	fr = myr*jj + total_2d_a(j,i+1)
531	DO ii = 0, dnx-1
532	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
533	ENDDO
534	ENDDO
535	ENDDO
536	ENDDO
537	!
538	!-- cyclic boundary conditions for ocean grid
539	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
540	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
541
542	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
543	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
544
545
546	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
547	target_id, tag, comm_inter, ierr )
548
549	ENDIF
550
551	CALL MPI_BARRIER( comm2d, ierr )
552
553	END SUBROUTINE interpolate_to_ocean

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