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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1092

Last change on this file since 1092 was 1092, checked in by raasch, 11 years ago
unused variables remove from several routines
Property svn:keywords set to `Id`
File size: 19.5 KB

Line
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	! unused variables removed
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 1092 2013-02-02 11:24:22Z raasch $
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	REAL :: time_since_reference_point_rem
69	REAL :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
70
71	#if defined( __parallel )
72
73	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
74
75
76
77	!
78	!-- In case of model termination initiated by the remote model
79	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
80	!-- The rest of the coupler must then be skipped because it would cause an MPI
81	!-- intercomminucation hang.
82	!-- If necessary, the coupler will be called at the beginning of the next
83	!-- restart run.
84
85	IF ( coupling_topology == 0 ) THEN
86	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
87	0, &
88	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
89	0, comm_inter, status, ierr )
90	ELSE
91	IF ( myid == 0) THEN
92	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
93	target_id, 0, &
94	terminate_coupled_remote, 1, MPI_INTEGER, &
95	target_id, 0, &
96	comm_inter, status, ierr )
97	ENDIF
98	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
99	ierr )
100
101	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
102	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
103
104	ENDIF
105
106	IF ( terminate_coupled_remote > 0 ) THEN
107	WRITE( message_string, * ) 'remote model "', &
108	TRIM( coupling_mode_remote ), &
109	'" terminated', &
110	'&with terminate_coupled_remote = ', &
111	terminate_coupled_remote, &
112	'&local model "', TRIM( coupling_mode ), &
113	'" has', &
114	'&terminate_coupled = ', &
115	terminate_coupled
116	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
117	RETURN
118	ENDIF
119
120
121	!
122	!-- Exchange the current simulated time between the models,
123	!-- currently just for total_2ding
124	IF ( coupling_topology == 0 ) THEN
125
126	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
127	comm_inter, ierr )
128	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
129	11, comm_inter, status, ierr )
130	ELSE
131
132	IF ( myid == 0 ) THEN
133
134	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
135	11, comm_inter, ierr )
136	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
137	target_id, 11, comm_inter, status, ierr )
138
139	ENDIF
140
141	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
142	ierr )
143
144	ENDIF
145
146	!
147	!-- Exchange the interface data
148	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
149
150	!
151	!-- Horizontal grid size and number of processors is equal in ocean and
152	!-- atmosphere
153	IF ( coupling_topology == 0 ) THEN
154
155	!
156	!-- Send heat flux at bottom surface to the ocean
157	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
158	comm_inter, ierr )
159	!
160	!-- Send humidity flux at bottom surface to the ocean
161	IF ( humidity ) THEN
162	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
163	comm_inter, ierr )
164	ENDIF
165	!
166	!-- Receive temperature at the bottom surface from the ocean
167	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
168	comm_inter, status, ierr )
169	!
170	!-- Send the momentum flux (u) at bottom surface to the ocean
171	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
172	comm_inter, ierr )
173	!
174	!-- Send the momentum flux (v) at bottom surface to the ocean
175	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
176	comm_inter, ierr )
177	!
178	!-- Receive u at the bottom surface from the ocean
179	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
180	comm_inter, status, ierr )
181	!
182	!-- Receive v at the bottom surface from the ocean
183	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
184	comm_inter, status, ierr )
185	!
186	!-- Horizontal grid size or number of processors differs between
187	!-- ocean and atmosphere
188	ELSE
189
190	!
191	!-- Send heat flux at bottom surface to the ocean
192	total_2d_a = 0.0
193	total_2d = 0.0
194	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
195
196	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
197	comm2d, ierr )
198	CALL interpolate_to_ocean( 12 )
199	!
200	!-- Send humidity flux at bottom surface to the ocean
201	IF ( humidity ) THEN
202	total_2d_a = 0.0
203	total_2d = 0.0
204	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
205
206	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
207	0, comm2d, ierr )
208	CALL interpolate_to_ocean( 13 )
209	ENDIF
210	!
211	!-- Receive temperature at the bottom surface from the ocean
212	IF ( myid == 0 ) THEN
213	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
214	target_id, 14, comm_inter, status, ierr )
215	ENDIF
216	CALL MPI_BARRIER( comm2d, ierr )
217	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
218	ierr )
219	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
220	!
221	!-- Send momentum flux (u) at bottom surface to the ocean
222	total_2d_a = 0.0
223	total_2d = 0.0
224	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
225	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
226	comm2d, ierr )
227	CALL interpolate_to_ocean( 15 )
228	!
229	!-- Send momentum flux (v) at bottom surface to the ocean
230	total_2d_a = 0.0
231	total_2d = 0.0
232	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
233	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
234	comm2d, ierr )
235	CALL interpolate_to_ocean( 16 )
236	!
237	!-- Receive u at the bottom surface from the ocean
238	IF ( myid == 0 ) THEN
239	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
240	target_id, 17, comm_inter, status, ierr )
241	ENDIF
242	CALL MPI_BARRIER( comm2d, ierr )
243	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
244	ierr )
245	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
246	!
247	!-- Receive v at the bottom surface from the ocean
248	IF ( myid == 0 ) THEN
249	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
250	target_id, 18, comm_inter, status, ierr )
251	ENDIF
252	CALL MPI_BARRIER( comm2d, ierr )
253	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
254	ierr )
255	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
256
257	ENDIF
258
259	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
260
261	!
262	!-- Horizontal grid size and number of processors is equal
263	!-- in ocean and atmosphere
264	IF ( coupling_topology == 0 ) THEN
265	!
266	!-- Receive heat flux at the sea surface (top) from the atmosphere
267	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
268	comm_inter, status, ierr )
269	!
270	!-- Receive humidity flux from the atmosphere (bottom)
271	!-- and add it to the heat flux at the sea surface (top)...
272	IF ( humidity_remote ) THEN
273	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
274	target_id, 13, comm_inter, status, ierr )
275	ENDIF
276	!
277	!-- Send sea surface temperature to the atmosphere model
278	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
279	comm_inter, ierr )
280	!
281	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
282	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
283	comm_inter, status, ierr )
284	!
285	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
286	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
287	comm_inter, status, ierr )
288	!
289	!-- Send u to the atmosphere
290	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
291	comm_inter, ierr )
292	!
293	!-- Send v to the atmosphere
294	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
295	comm_inter, ierr )
296	!
297	!-- Horizontal gridsize or number of processors differs between
298	!-- ocean and atmosphere
299	ELSE
300	!
301	!-- Receive heat flux at the sea surface (top) from the atmosphere
302	IF ( myid == 0 ) THEN
303	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
304	target_id, 12, comm_inter, status, ierr )
305	ENDIF
306	CALL MPI_BARRIER( comm2d, ierr )
307	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
308	ierr )
309	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
310	!
311	!-- Receive humidity flux at the sea surface (top) from the atmosphere
312	IF ( humidity_remote ) THEN
313	IF ( myid == 0 ) THEN
314	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
315	target_id, 13, comm_inter, status, ierr )
316	ENDIF
317	CALL MPI_BARRIER( comm2d, ierr )
318	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
319	comm2d, ierr)
320	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
321	ENDIF
322	!
323	!-- Send surface temperature to atmosphere
324	total_2d_o = 0.0
325	total_2d = 0.0
326	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
327
328	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
329	comm2d, ierr)
330	CALL interpolate_to_atmos( 14 )
331	!
332	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
333	IF ( myid == 0 ) THEN
334	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
335	target_id, 15, comm_inter, status, ierr )
336	ENDIF
337	CALL MPI_BARRIER( comm2d, ierr )
338	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
339	0, comm2d, ierr )
340	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
341	!
342	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
343	IF ( myid == 0 ) THEN
344	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
345	target_id, 16, comm_inter, status, ierr )
346	ENDIF
347	CALL MPI_BARRIER( comm2d, ierr )
348	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
349	ierr )
350	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
351	!
352	!-- Send u to atmosphere
353	total_2d_o = 0.0
354	total_2d = 0.0
355	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
356	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
357	comm2d, ierr )
358	CALL interpolate_to_atmos( 17 )
359	!
360	!-- Send v to atmosphere
361	total_2d_o = 0.0
362	total_2d = 0.0
363	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
364	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
365	comm2d, ierr )
366	CALL interpolate_to_atmos( 18 )
367
368	ENDIF
369
370	!
371	!-- Conversions of fluxes received from atmosphere
372	IF ( humidity_remote ) THEN
373	!
374	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
375	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
376	!-- /(rho_atm(=1.0)*c_p)
377	tswst = tswst + qswst_remote * 2.2626108E6 / 1005.0
378	!
379	!-- ...and convert it to a salinity flux at the sea surface (top)
380	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
381	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
382	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
383	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
384	ENDIF
385
386	!
387	!-- Adjust the kinematic heat flux with respect to ocean density
388	!-- (constants are the specific heat capacities for air and water)
389	!-- now tswst is the ocean top heat flux
390	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
391
392	!
393	!-- Adjust the momentum fluxes with respect to ocean density
394	uswst = uswst / rho(nzt,:,:)
395	vswst = vswst / rho(nzt,:,:)
396
397	ENDIF
398
399	IF ( coupling_topology == 1 ) THEN
400	DEALLOCATE( total_2d_o, total_2d_a )
401	ENDIF
402
403	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
404
405	#endif
406
407	END SUBROUTINE surface_coupler
408
409
410
411	SUBROUTINE interpolate_to_atmos( tag )
412
413	#if defined( __parallel )
414
415	USE arrays_3d
416	USE control_parameters
417	USE grid_variables
418	USE indices
419	USE pegrid
420
421	IMPLICIT NONE
422
423	INTEGER :: dnx, dnx2, dny, dny2, i, ii, j, jj
424	INTEGER, intent(in) :: tag
425
426	CALL MPI_BARRIER( comm2d, ierr )
427
428	IF ( myid == 0 ) THEN
429	!
430	!-- Cyclic boundary conditions for the total 2D-grid
431	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
432	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
433
434	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
435	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
436
437	!
438	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
439	dnx = (nx_o+1) / (nx_a+1)
440	dny = (ny_o+1) / (ny_a+1)
441
442	!
443	!-- Distance for interpolation around coarse grid points within the fine
444	!-- grid (note: 2*dnx2 must not be equal with dnx)
445	dnx2 = 2 * ( dnx / 2 )
446	dny2 = 2 * ( dny / 2 )
447
448	total_2d_a = 0.0
449	!
450	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
451	DO j = 0, ny_a
452	DO i = 0, nx_a
453	DO jj = 0, dny2
454	DO ii = 0, dnx2
455	total_2d_a(j,i) = total_2d_a(j,i) &
456	+ total_2d_o(jdny+jj,idnx+ii)
457	ENDDO
458	ENDDO
459	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
460	ENDDO
461	ENDDO
462	!
463	!-- Cyclic boundary conditions for atmosphere grid
464	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
465	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
466
467	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
468	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
469	!
470	!-- Transfer of the atmosphere-grid-layer to the atmosphere
471	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
472	tag, comm_inter, ierr )
473
474	ENDIF
475
476	CALL MPI_BARRIER( comm2d, ierr )
477
478	#endif
479
480	END SUBROUTINE interpolate_to_atmos
481
482
483	SUBROUTINE interpolate_to_ocean( tag )
484
485	#if defined( __parallel )
486
487	USE arrays_3d
488	USE control_parameters
489	USE grid_variables
490	USE indices
491	USE pegrid
492
493	IMPLICIT NONE
494
495	INTEGER :: dnx, dny, i, ii, j, jj
496	INTEGER, intent(in) :: tag
497	REAL :: fl, fr, myl, myr
498
499
500	CALL MPI_BARRIER( comm2d, ierr )
501
502	IF ( myid == 0 ) THEN
503
504	!
505	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
506	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
507	dny = ( ny_o + 1 ) / ( ny_a + 1 )
508
509	!
510	!-- Cyclic boundary conditions for atmosphere grid
511	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
512	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
513
514	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
515	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
516	!
517	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
518	DO j = 0, ny
519	DO i = 0, nx
520	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
521	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
522	DO jj = 0, dny-1
523	fl = myl*jj + total_2d_a(j,i)
524	fr = myr*jj + total_2d_a(j,i+1)
525	DO ii = 0, dnx-1
526	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
527	ENDDO
528	ENDDO
529	ENDDO
530	ENDDO
531	!
532	!-- Cyclic boundary conditions for ocean grid
533	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
534	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
535
536	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
537	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
538
539	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
540	target_id, tag, comm_inter, ierr )
541
542	ENDIF
543
544	CALL MPI_BARRIER( comm2d, ierr )
545
546	#endif
547
548	END SUBROUTINE interpolate_to_ocean

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