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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1036

Last change on this file since 1036 was 1036, checked in by raasch, 12 years ago
code has been put under the GNU General Public License (v3)
Property svn:keywords set to `Id`
File size: 19.5 KB

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1	SUBROUTINE surface_coupler
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 1997-2012 Leibniz University Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! ------------------
26	! $Id: surface_coupler.f90 1036 2012-10-22 13:43:42Z raasch $
27	!
28	! 880 2012-04-13 06:28:59Z raasch
29	! Bugfix: preprocessor statements for parallel execution added
30	!
31	! 709 2011-03-30 09:31:40Z raasch
32	! formatting adjustments
33	!
34	! 667 2010-12-23 12:06:00Z suehring/gryschka
35	! Additional case for nonequivalent processor and grid topopolgy in ocean and
36	! atmosphere added (coupling_topology = 1).
37	! Added exchange of u and v from Ocean to Atmosphere
38	!
39	! 291 2009-04-16 12:07:26Z raasch
40	! Coupling with independent precursor runs.
41	! Output of messages replaced by message handling routine.
42	!
43	! 206 2008-10-13 14:59:11Z raasch
44	! Implementation of a MPI-1 Coupling: replaced myid with target_id,
45	! deleted __mpi2 directives
46	!
47	! 109 2007-08-28 15:26:47Z letzel
48	! Initial revision
49	!
50	! Description:
51	! ------------
52	! Data exchange at the interface between coupled models
53	!------------------------------------------------------------------------------!
54
55	USE arrays_3d
56	USE control_parameters
57	USE cpulog
58	USE grid_variables
59	USE indices
60	USE interfaces
61	USE pegrid
62
63	IMPLICIT NONE
64
65	INTEGER :: i, j, k
66
67	REAL :: time_since_reference_point_rem
68	REAL :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
69
70	#if defined( __parallel )
71
72	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
73
74
75
76	!
77	!-- In case of model termination initiated by the remote model
78	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
79	!-- The rest of the coupler must then be skipped because it would cause an MPI
80	!-- intercomminucation hang.
81	!-- If necessary, the coupler will be called at the beginning of the next
82	!-- restart run.
83
84	IF ( coupling_topology == 0 ) THEN
85	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
86	0, &
87	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
88	0, comm_inter, status, ierr )
89	ELSE
90	IF ( myid == 0) THEN
91	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
92	target_id, 0, &
93	terminate_coupled_remote, 1, MPI_INTEGER, &
94	target_id, 0, &
95	comm_inter, status, ierr )
96	ENDIF
97	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
98	ierr )
99
100	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
101	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
102
103	ENDIF
104
105	IF ( terminate_coupled_remote > 0 ) THEN
106	WRITE( message_string, * ) 'remote model "', &
107	TRIM( coupling_mode_remote ), &
108	'" terminated', &
109	'&with terminate_coupled_remote = ', &
110	terminate_coupled_remote, &
111	'&local model "', TRIM( coupling_mode ), &
112	'" has', &
113	'&terminate_coupled = ', &
114	terminate_coupled
115	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
116	RETURN
117	ENDIF
118
119
120	!
121	!-- Exchange the current simulated time between the models,
122	!-- currently just for total_2ding
123	IF ( coupling_topology == 0 ) THEN
124
125	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
126	comm_inter, ierr )
127	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
128	11, comm_inter, status, ierr )
129	ELSE
130
131	IF ( myid == 0 ) THEN
132
133	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
134	11, comm_inter, ierr )
135	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
136	target_id, 11, comm_inter, status, ierr )
137
138	ENDIF
139
140	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
141	ierr )
142
143	ENDIF
144
145	!
146	!-- Exchange the interface data
147	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
148
149	!
150	!-- Horizontal grid size and number of processors is equal in ocean and
151	!-- atmosphere
152	IF ( coupling_topology == 0 ) THEN
153
154	!
155	!-- Send heat flux at bottom surface to the ocean
156	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
157	comm_inter, ierr )
158	!
159	!-- Send humidity flux at bottom surface to the ocean
160	IF ( humidity ) THEN
161	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
162	comm_inter, ierr )
163	ENDIF
164	!
165	!-- Receive temperature at the bottom surface from the ocean
166	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
167	comm_inter, status, ierr )
168	!
169	!-- Send the momentum flux (u) at bottom surface to the ocean
170	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
171	comm_inter, ierr )
172	!
173	!-- Send the momentum flux (v) at bottom surface to the ocean
174	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
175	comm_inter, ierr )
176	!
177	!-- Receive u at the bottom surface from the ocean
178	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
179	comm_inter, status, ierr )
180	!
181	!-- Receive v at the bottom surface from the ocean
182	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
183	comm_inter, status, ierr )
184	!
185	!-- Horizontal grid size or number of processors differs between
186	!-- ocean and atmosphere
187	ELSE
188
189	!
190	!-- Send heat flux at bottom surface to the ocean
191	total_2d_a = 0.0
192	total_2d = 0.0
193	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
194
195	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
196	comm2d, ierr )
197	CALL interpolate_to_ocean( 12 )
198	!
199	!-- Send humidity flux at bottom surface to the ocean
200	IF ( humidity ) THEN
201	total_2d_a = 0.0
202	total_2d = 0.0
203	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
204
205	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
206	0, comm2d, ierr )
207	CALL interpolate_to_ocean( 13 )
208	ENDIF
209	!
210	!-- Receive temperature at the bottom surface from the ocean
211	IF ( myid == 0 ) THEN
212	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
213	target_id, 14, comm_inter, status, ierr )
214	ENDIF
215	CALL MPI_BARRIER( comm2d, ierr )
216	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
217	ierr )
218	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
219	!
220	!-- Send momentum flux (u) at bottom surface to the ocean
221	total_2d_a = 0.0
222	total_2d = 0.0
223	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
224	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
225	comm2d, ierr )
226	CALL interpolate_to_ocean( 15 )
227	!
228	!-- Send momentum flux (v) at bottom surface to the ocean
229	total_2d_a = 0.0
230	total_2d = 0.0
231	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
232	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
233	comm2d, ierr )
234	CALL interpolate_to_ocean( 16 )
235	!
236	!-- Receive u at the bottom surface from the ocean
237	IF ( myid == 0 ) THEN
238	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
239	target_id, 17, comm_inter, status, ierr )
240	ENDIF
241	CALL MPI_BARRIER( comm2d, ierr )
242	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
243	ierr )
244	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
245	!
246	!-- Receive v at the bottom surface from the ocean
247	IF ( myid == 0 ) THEN
248	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
249	target_id, 18, comm_inter, status, ierr )
250	ENDIF
251	CALL MPI_BARRIER( comm2d, ierr )
252	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
253	ierr )
254	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
255
256	ENDIF
257
258	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
259
260	!
261	!-- Horizontal grid size and number of processors is equal
262	!-- in ocean and atmosphere
263	IF ( coupling_topology == 0 ) THEN
264	!
265	!-- Receive heat flux at the sea surface (top) from the atmosphere
266	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
267	comm_inter, status, ierr )
268	!
269	!-- Receive humidity flux from the atmosphere (bottom)
270	!-- and add it to the heat flux at the sea surface (top)...
271	IF ( humidity_remote ) THEN
272	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
273	target_id, 13, comm_inter, status, ierr )
274	ENDIF
275	!
276	!-- Send sea surface temperature to the atmosphere model
277	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
278	comm_inter, ierr )
279	!
280	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
281	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
282	comm_inter, status, ierr )
283	!
284	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
285	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
286	comm_inter, status, ierr )
287	!
288	!-- Send u to the atmosphere
289	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
290	comm_inter, ierr )
291	!
292	!-- Send v to the atmosphere
293	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
294	comm_inter, ierr )
295	!
296	!-- Horizontal gridsize or number of processors differs between
297	!-- ocean and atmosphere
298	ELSE
299	!
300	!-- Receive heat flux at the sea surface (top) from the atmosphere
301	IF ( myid == 0 ) THEN
302	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
303	target_id, 12, comm_inter, status, ierr )
304	ENDIF
305	CALL MPI_BARRIER( comm2d, ierr )
306	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
307	ierr )
308	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
309	!
310	!-- Receive humidity flux at the sea surface (top) from the atmosphere
311	IF ( humidity_remote ) THEN
312	IF ( myid == 0 ) THEN
313	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
314	target_id, 13, comm_inter, status, ierr )
315	ENDIF
316	CALL MPI_BARRIER( comm2d, ierr )
317	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
318	comm2d, ierr)
319	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
320	ENDIF
321	!
322	!-- Send surface temperature to atmosphere
323	total_2d_o = 0.0
324	total_2d = 0.0
325	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
326
327	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
328	comm2d, ierr)
329	CALL interpolate_to_atmos( 14 )
330	!
331	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
332	IF ( myid == 0 ) THEN
333	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
334	target_id, 15, comm_inter, status, ierr )
335	ENDIF
336	CALL MPI_BARRIER( comm2d, ierr )
337	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
338	0, comm2d, ierr )
339	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
340	!
341	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
342	IF ( myid == 0 ) THEN
343	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
344	target_id, 16, comm_inter, status, ierr )
345	ENDIF
346	CALL MPI_BARRIER( comm2d, ierr )
347	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
348	ierr )
349	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
350	!
351	!-- Send u to atmosphere
352	total_2d_o = 0.0
353	total_2d = 0.0
354	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
355	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
356	comm2d, ierr )
357	CALL interpolate_to_atmos( 17 )
358	!
359	!-- Send v to atmosphere
360	total_2d_o = 0.0
361	total_2d = 0.0
362	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
363	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
364	comm2d, ierr )
365	CALL interpolate_to_atmos( 18 )
366
367	ENDIF
368
369	!
370	!-- Conversions of fluxes received from atmosphere
371	IF ( humidity_remote ) THEN
372	!
373	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
374	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
375	!-- /(rho_atm(=1.0)*c_p)
376	tswst = tswst + qswst_remote * 2.2626108E6 / 1005.0
377	!
378	!-- ...and convert it to a salinity flux at the sea surface (top)
379	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
380	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
381	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
382	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
383	ENDIF
384
385	!
386	!-- Adjust the kinematic heat flux with respect to ocean density
387	!-- (constants are the specific heat capacities for air and water)
388	!-- now tswst is the ocean top heat flux
389	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
390
391	!
392	!-- Adjust the momentum fluxes with respect to ocean density
393	uswst = uswst / rho(nzt,:,:)
394	vswst = vswst / rho(nzt,:,:)
395
396	ENDIF
397
398	IF ( coupling_topology == 1 ) THEN
399	DEALLOCATE( total_2d_o, total_2d_a )
400	ENDIF
401
402	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
403
404	#endif
405
406	END SUBROUTINE surface_coupler
407
408
409
410	SUBROUTINE interpolate_to_atmos( tag )
411
412	#if defined( __parallel )
413
414	USE arrays_3d
415	USE control_parameters
416	USE grid_variables
417	USE indices
418	USE pegrid
419
420	IMPLICIT NONE
421
422	INTEGER :: dnx, dnx2, dny, dny2, i, ii, j, jj
423	INTEGER, intent(in) :: tag
424
425	CALL MPI_BARRIER( comm2d, ierr )
426
427	IF ( myid == 0 ) THEN
428	!
429	!-- Cyclic boundary conditions for the total 2D-grid
430	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
431	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
432
433	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
434	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
435
436	!
437	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
438	dnx = (nx_o+1) / (nx_a+1)
439	dny = (ny_o+1) / (ny_a+1)
440
441	!
442	!-- Distance for interpolation around coarse grid points within the fine
443	!-- grid (note: 2*dnx2 must not be equal with dnx)
444	dnx2 = 2 * ( dnx / 2 )
445	dny2 = 2 * ( dny / 2 )
446
447	total_2d_a = 0.0
448	!
449	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
450	DO j = 0, ny_a
451	DO i = 0, nx_a
452	DO jj = 0, dny2
453	DO ii = 0, dnx2
454	total_2d_a(j,i) = total_2d_a(j,i) &
455	+ total_2d_o(jdny+jj,idnx+ii)
456	ENDDO
457	ENDDO
458	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
459	ENDDO
460	ENDDO
461	!
462	!-- Cyclic boundary conditions for atmosphere grid
463	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
464	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
465
466	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
467	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
468	!
469	!-- Transfer of the atmosphere-grid-layer to the atmosphere
470	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
471	tag, comm_inter, ierr )
472
473	ENDIF
474
475	CALL MPI_BARRIER( comm2d, ierr )
476
477	#endif
478
479	END SUBROUTINE interpolate_to_atmos
480
481
482	SUBROUTINE interpolate_to_ocean( tag )
483
484	#if defined( __parallel )
485
486	USE arrays_3d
487	USE control_parameters
488	USE grid_variables
489	USE indices
490	USE pegrid
491
492	IMPLICIT NONE
493
494	INTEGER :: dnx, dny, i, ii, j, jj
495	INTEGER, intent(in) :: tag
496	REAL :: fl, fr, myl, myr
497
498
499	CALL MPI_BARRIER( comm2d, ierr )
500
501	IF ( myid == 0 ) THEN
502
503	!
504	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
505	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
506	dny = ( ny_o + 1 ) / ( ny_a + 1 )
507
508	!
509	!-- Cyclic boundary conditions for atmosphere grid
510	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
511	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
512
513	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
514	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
515	!
516	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
517	DO j = 0, ny
518	DO i = 0, nx
519	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
520	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
521	DO jj = 0, dny-1
522	fl = myl*jj + total_2d_a(j,i)
523	fr = myr*jj + total_2d_a(j,i+1)
524	DO ii = 0, dnx-1
525	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
526	ENDDO
527	ENDDO
528	ENDDO
529	ENDDO
530	!
531	!-- Cyclic boundary conditions for ocean grid
532	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
533	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
534
535	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
536	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
537
538	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
539	target_id, tag, comm_inter, ierr )
540
541	ENDIF
542
543	CALL MPI_BARRIER( comm2d, ierr )
544
545	#endif
546
547	END SUBROUTINE interpolate_to_ocean

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