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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1078

Last change on this file since 1078 was 1037, checked in by raasch, 12 years ago
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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 1037 2012-10-22 14:10:22Z maronga $
27	!
28	! 1036 2012-10-22 13:43:42Z raasch
29	! code put under GPL (PALM 3.9)
30	!
31	! 880 2012-04-13 06:28:59Z raasch
32	! Bugfix: preprocessor statements for parallel execution added
33	!
34	! 709 2011-03-30 09:31:40Z raasch
35	! formatting adjustments
36	!
37	! 667 2010-12-23 12:06:00Z suehring/gryschka
38	! Additional case for nonequivalent processor and grid topopolgy in ocean and
39	! atmosphere added (coupling_topology = 1).
40	! Added exchange of u and v from Ocean to Atmosphere
41	!
42	! 291 2009-04-16 12:07:26Z raasch
43	! Coupling with independent precursor runs.
44	! Output of messages replaced by message handling routine.
45	!
46	! 206 2008-10-13 14:59:11Z raasch
47	! Implementation of a MPI-1 Coupling: replaced myid with target_id,
48	! deleted __mpi2 directives
49	!
50	! 109 2007-08-28 15:26:47Z letzel
51	! Initial revision
52	!
53	! Description:
54	! ------------
55	! Data exchange at the interface between coupled models
56	!------------------------------------------------------------------------------!
57
58	USE arrays_3d
59	USE control_parameters
60	USE cpulog
61	USE grid_variables
62	USE indices
63	USE interfaces
64	USE pegrid
65
66	IMPLICIT NONE
67
68	INTEGER :: i, j, k
69
70	REAL :: time_since_reference_point_rem
71	REAL :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
72
73	#if defined( __parallel )
74
75	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
76
77
78
79	!
80	!-- In case of model termination initiated by the remote model
81	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
82	!-- The rest of the coupler must then be skipped because it would cause an MPI
83	!-- intercomminucation hang.
84	!-- If necessary, the coupler will be called at the beginning of the next
85	!-- restart run.
86
87	IF ( coupling_topology == 0 ) THEN
88	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
89	0, &
90	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
91	0, comm_inter, status, ierr )
92	ELSE
93	IF ( myid == 0) THEN
94	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
95	target_id, 0, &
96	terminate_coupled_remote, 1, MPI_INTEGER, &
97	target_id, 0, &
98	comm_inter, status, ierr )
99	ENDIF
100	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
101	ierr )
102
103	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
104	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
105
106	ENDIF
107
108	IF ( terminate_coupled_remote > 0 ) THEN
109	WRITE( message_string, * ) 'remote model "', &
110	TRIM( coupling_mode_remote ), &
111	'" terminated', &
112	'&with terminate_coupled_remote = ', &
113	terminate_coupled_remote, &
114	'&local model "', TRIM( coupling_mode ), &
115	'" has', &
116	'&terminate_coupled = ', &
117	terminate_coupled
118	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
119	RETURN
120	ENDIF
121
122
123	!
124	!-- Exchange the current simulated time between the models,
125	!-- currently just for total_2ding
126	IF ( coupling_topology == 0 ) THEN
127
128	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
129	comm_inter, ierr )
130	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
131	11, comm_inter, status, ierr )
132	ELSE
133
134	IF ( myid == 0 ) THEN
135
136	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
137	11, comm_inter, ierr )
138	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
139	target_id, 11, comm_inter, status, ierr )
140
141	ENDIF
142
143	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
144	ierr )
145
146	ENDIF
147
148	!
149	!-- Exchange the interface data
150	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
151
152	!
153	!-- Horizontal grid size and number of processors is equal in ocean and
154	!-- atmosphere
155	IF ( coupling_topology == 0 ) THEN
156
157	!
158	!-- Send heat flux at bottom surface to the ocean
159	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
160	comm_inter, ierr )
161	!
162	!-- Send humidity flux at bottom surface to the ocean
163	IF ( humidity ) THEN
164	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
165	comm_inter, ierr )
166	ENDIF
167	!
168	!-- Receive temperature at the bottom surface from the ocean
169	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
170	comm_inter, status, ierr )
171	!
172	!-- Send the momentum flux (u) at bottom surface to the ocean
173	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
174	comm_inter, ierr )
175	!
176	!-- Send the momentum flux (v) at bottom surface to the ocean
177	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
178	comm_inter, ierr )
179	!
180	!-- Receive u at the bottom surface from the ocean
181	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
182	comm_inter, status, ierr )
183	!
184	!-- Receive v at the bottom surface from the ocean
185	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
186	comm_inter, status, ierr )
187	!
188	!-- Horizontal grid size or number of processors differs between
189	!-- ocean and atmosphere
190	ELSE
191
192	!
193	!-- Send heat flux at bottom surface to the ocean
194	total_2d_a = 0.0
195	total_2d = 0.0
196	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
197
198	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
199	comm2d, ierr )
200	CALL interpolate_to_ocean( 12 )
201	!
202	!-- Send humidity flux at bottom surface to the ocean
203	IF ( humidity ) THEN
204	total_2d_a = 0.0
205	total_2d = 0.0
206	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
207
208	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
209	0, comm2d, ierr )
210	CALL interpolate_to_ocean( 13 )
211	ENDIF
212	!
213	!-- Receive temperature at the bottom surface from the ocean
214	IF ( myid == 0 ) THEN
215	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
216	target_id, 14, comm_inter, status, ierr )
217	ENDIF
218	CALL MPI_BARRIER( comm2d, ierr )
219	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
220	ierr )
221	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
222	!
223	!-- Send momentum flux (u) at bottom surface to the ocean
224	total_2d_a = 0.0
225	total_2d = 0.0
226	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
227	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
228	comm2d, ierr )
229	CALL interpolate_to_ocean( 15 )
230	!
231	!-- Send momentum flux (v) at bottom surface to the ocean
232	total_2d_a = 0.0
233	total_2d = 0.0
234	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
235	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
236	comm2d, ierr )
237	CALL interpolate_to_ocean( 16 )
238	!
239	!-- Receive u at the bottom surface from the ocean
240	IF ( myid == 0 ) THEN
241	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
242	target_id, 17, comm_inter, status, ierr )
243	ENDIF
244	CALL MPI_BARRIER( comm2d, ierr )
245	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
246	ierr )
247	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
248	!
249	!-- Receive v at the bottom surface from the ocean
250	IF ( myid == 0 ) THEN
251	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
252	target_id, 18, comm_inter, status, ierr )
253	ENDIF
254	CALL MPI_BARRIER( comm2d, ierr )
255	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
256	ierr )
257	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
258
259	ENDIF
260
261	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
262
263	!
264	!-- Horizontal grid size and number of processors is equal
265	!-- in ocean and atmosphere
266	IF ( coupling_topology == 0 ) THEN
267	!
268	!-- Receive heat flux at the sea surface (top) from the atmosphere
269	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
270	comm_inter, status, ierr )
271	!
272	!-- Receive humidity flux from the atmosphere (bottom)
273	!-- and add it to the heat flux at the sea surface (top)...
274	IF ( humidity_remote ) THEN
275	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
276	target_id, 13, comm_inter, status, ierr )
277	ENDIF
278	!
279	!-- Send sea surface temperature to the atmosphere model
280	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
281	comm_inter, ierr )
282	!
283	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
284	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
285	comm_inter, status, ierr )
286	!
287	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
288	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
289	comm_inter, status, ierr )
290	!
291	!-- Send u to the atmosphere
292	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
293	comm_inter, ierr )
294	!
295	!-- Send v to the atmosphere
296	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
297	comm_inter, ierr )
298	!
299	!-- Horizontal gridsize or number of processors differs between
300	!-- ocean and atmosphere
301	ELSE
302	!
303	!-- Receive heat flux at the sea surface (top) from the atmosphere
304	IF ( myid == 0 ) THEN
305	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
306	target_id, 12, comm_inter, status, ierr )
307	ENDIF
308	CALL MPI_BARRIER( comm2d, ierr )
309	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
310	ierr )
311	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
312	!
313	!-- Receive humidity flux at the sea surface (top) from the atmosphere
314	IF ( humidity_remote ) THEN
315	IF ( myid == 0 ) THEN
316	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
317	target_id, 13, comm_inter, status, ierr )
318	ENDIF
319	CALL MPI_BARRIER( comm2d, ierr )
320	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
321	comm2d, ierr)
322	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
323	ENDIF
324	!
325	!-- Send surface temperature to atmosphere
326	total_2d_o = 0.0
327	total_2d = 0.0
328	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
329
330	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
331	comm2d, ierr)
332	CALL interpolate_to_atmos( 14 )
333	!
334	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
335	IF ( myid == 0 ) THEN
336	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
337	target_id, 15, comm_inter, status, ierr )
338	ENDIF
339	CALL MPI_BARRIER( comm2d, ierr )
340	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
341	0, comm2d, ierr )
342	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
343	!
344	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
345	IF ( myid == 0 ) THEN
346	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
347	target_id, 16, comm_inter, status, ierr )
348	ENDIF
349	CALL MPI_BARRIER( comm2d, ierr )
350	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
351	ierr )
352	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
353	!
354	!-- Send u to atmosphere
355	total_2d_o = 0.0
356	total_2d = 0.0
357	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
358	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
359	comm2d, ierr )
360	CALL interpolate_to_atmos( 17 )
361	!
362	!-- Send v to atmosphere
363	total_2d_o = 0.0
364	total_2d = 0.0
365	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
366	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
367	comm2d, ierr )
368	CALL interpolate_to_atmos( 18 )
369
370	ENDIF
371
372	!
373	!-- Conversions of fluxes received from atmosphere
374	IF ( humidity_remote ) THEN
375	!
376	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
377	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
378	!-- /(rho_atm(=1.0)*c_p)
379	tswst = tswst + qswst_remote * 2.2626108E6 / 1005.0
380	!
381	!-- ...and convert it to a salinity flux at the sea surface (top)
382	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
383	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
384	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
385	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
386	ENDIF
387
388	!
389	!-- Adjust the kinematic heat flux with respect to ocean density
390	!-- (constants are the specific heat capacities for air and water)
391	!-- now tswst is the ocean top heat flux
392	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
393
394	!
395	!-- Adjust the momentum fluxes with respect to ocean density
396	uswst = uswst / rho(nzt,:,:)
397	vswst = vswst / rho(nzt,:,:)
398
399	ENDIF
400
401	IF ( coupling_topology == 1 ) THEN
402	DEALLOCATE( total_2d_o, total_2d_a )
403	ENDIF
404
405	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
406
407	#endif
408
409	END SUBROUTINE surface_coupler
410
411
412
413	SUBROUTINE interpolate_to_atmos( tag )
414
415	#if defined( __parallel )
416
417	USE arrays_3d
418	USE control_parameters
419	USE grid_variables
420	USE indices
421	USE pegrid
422
423	IMPLICIT NONE
424
425	INTEGER :: dnx, dnx2, dny, dny2, i, ii, j, jj
426	INTEGER, intent(in) :: tag
427
428	CALL MPI_BARRIER( comm2d, ierr )
429
430	IF ( myid == 0 ) THEN
431	!
432	!-- Cyclic boundary conditions for the total 2D-grid
433	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
434	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
435
436	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
437	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
438
439	!
440	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
441	dnx = (nx_o+1) / (nx_a+1)
442	dny = (ny_o+1) / (ny_a+1)
443
444	!
445	!-- Distance for interpolation around coarse grid points within the fine
446	!-- grid (note: 2*dnx2 must not be equal with dnx)
447	dnx2 = 2 * ( dnx / 2 )
448	dny2 = 2 * ( dny / 2 )
449
450	total_2d_a = 0.0
451	!
452	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
453	DO j = 0, ny_a
454	DO i = 0, nx_a
455	DO jj = 0, dny2
456	DO ii = 0, dnx2
457	total_2d_a(j,i) = total_2d_a(j,i) &
458	+ total_2d_o(jdny+jj,idnx+ii)
459	ENDDO
460	ENDDO
461	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
462	ENDDO
463	ENDDO
464	!
465	!-- Cyclic boundary conditions for atmosphere grid
466	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
467	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
468
469	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
470	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
471	!
472	!-- Transfer of the atmosphere-grid-layer to the atmosphere
473	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
474	tag, comm_inter, ierr )
475
476	ENDIF
477
478	CALL MPI_BARRIER( comm2d, ierr )
479
480	#endif
481
482	END SUBROUTINE interpolate_to_atmos
483
484
485	SUBROUTINE interpolate_to_ocean( tag )
486
487	#if defined( __parallel )
488
489	USE arrays_3d
490	USE control_parameters
491	USE grid_variables
492	USE indices
493	USE pegrid
494
495	IMPLICIT NONE
496
497	INTEGER :: dnx, dny, i, ii, j, jj
498	INTEGER, intent(in) :: tag
499	REAL :: fl, fr, myl, myr
500
501
502	CALL MPI_BARRIER( comm2d, ierr )
503
504	IF ( myid == 0 ) THEN
505
506	!
507	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
508	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
509	dny = ( ny_o + 1 ) / ( ny_a + 1 )
510
511	!
512	!-- Cyclic boundary conditions for atmosphere grid
513	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
514	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
515
516	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
517	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
518	!
519	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
520	DO j = 0, ny
521	DO i = 0, nx
522	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
523	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
524	DO jj = 0, dny-1
525	fl = myl*jj + total_2d_a(j,i)
526	fr = myr*jj + total_2d_a(j,i+1)
527	DO ii = 0, dnx-1
528	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
529	ENDDO
530	ENDDO
531	ENDDO
532	ENDDO
533	!
534	!-- Cyclic boundary conditions for ocean grid
535	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
536	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
537
538	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
539	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
540
541	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
542	target_id, tag, comm_inter, ierr )
543
544	ENDIF
545
546	CALL MPI_BARRIER( comm2d, ierr )
547
548	#endif
549
550	END SUBROUTINE interpolate_to_ocean

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