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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1319

Last change on this file since 1319 was 1319, checked in by raasch, 10 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 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 1319 2014-03-17 15:08:44Z raasch $
27	!
28	! 1318 2014-03-17 13:35:16Z raasch
29	! module interfaces removed
30	!
31	! 1092 2013-02-02 11:24:22Z raasch
32	! unused variables removed
33	!
34	! 1036 2012-10-22 13:43:42Z raasch
35	! code put under GPL (PALM 3.9)
36	!
37	! 880 2012-04-13 06:28:59Z raasch
38	! Bugfix: preprocessor statements for parallel execution added
39	!
40	! 709 2011-03-30 09:31:40Z raasch
41	! formatting adjustments
42	!
43	! 667 2010-12-23 12:06:00Z suehring/gryschka
44	! Additional case for nonequivalent processor and grid topopolgy in ocean and
45	! atmosphere added (coupling_topology = 1).
46	! Added exchange of u and v from Ocean to Atmosphere
47	!
48	! 291 2009-04-16 12:07:26Z raasch
49	! Coupling with independent precursor runs.
50	! Output of messages replaced by message handling routine.
51	!
52	! 206 2008-10-13 14:59:11Z raasch
53	! Implementation of a MPI-1 Coupling: replaced myid with target_id,
54	! deleted __mpi2 directives
55	!
56	! 109 2007-08-28 15:26:47Z letzel
57	! Initial revision
58	!
59	! Description:
60	! ------------
61	! Data exchange at the interface between coupled models
62	!------------------------------------------------------------------------------!
63
64	USE arrays_3d
65	USE control_parameters
66	USE cpulog
67	USE grid_variables
68	USE indices
69	USE pegrid
70
71	IMPLICIT NONE
72
73	REAL :: time_since_reference_point_rem
74	REAL :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
75
76	#if defined( __parallel )
77
78	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
79
80
81
82	!
83	!-- In case of model termination initiated by the remote model
84	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
85	!-- The rest of the coupler must then be skipped because it would cause an MPI
86	!-- intercomminucation hang.
87	!-- If necessary, the coupler will be called at the beginning of the next
88	!-- restart run.
89
90	IF ( coupling_topology == 0 ) THEN
91	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
92	0, &
93	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
94	0, comm_inter, status, ierr )
95	ELSE
96	IF ( myid == 0) THEN
97	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
98	target_id, 0, &
99	terminate_coupled_remote, 1, MPI_INTEGER, &
100	target_id, 0, &
101	comm_inter, status, ierr )
102	ENDIF
103	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
104	ierr )
105
106	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
107	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
108
109	ENDIF
110
111	IF ( terminate_coupled_remote > 0 ) THEN
112	WRITE( message_string, * ) 'remote model "', &
113	TRIM( coupling_mode_remote ), &
114	'" terminated', &
115	'&with terminate_coupled_remote = ', &
116	terminate_coupled_remote, &
117	'&local model "', TRIM( coupling_mode ), &
118	'" has', &
119	'&terminate_coupled = ', &
120	terminate_coupled
121	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
122	RETURN
123	ENDIF
124
125
126	!
127	!-- Exchange the current simulated time between the models,
128	!-- currently just for total_2ding
129	IF ( coupling_topology == 0 ) THEN
130
131	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
132	comm_inter, ierr )
133	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
134	11, comm_inter, status, ierr )
135	ELSE
136
137	IF ( myid == 0 ) THEN
138
139	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
140	11, comm_inter, ierr )
141	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
142	target_id, 11, comm_inter, status, ierr )
143
144	ENDIF
145
146	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
147	ierr )
148
149	ENDIF
150
151	!
152	!-- Exchange the interface data
153	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
154
155	!
156	!-- Horizontal grid size and number of processors is equal in ocean and
157	!-- atmosphere
158	IF ( coupling_topology == 0 ) THEN
159
160	!
161	!-- Send heat flux at bottom surface to the ocean
162	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
163	comm_inter, ierr )
164	!
165	!-- Send humidity flux at bottom surface to the ocean
166	IF ( humidity ) THEN
167	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
168	comm_inter, ierr )
169	ENDIF
170	!
171	!-- Receive temperature at the bottom surface from the ocean
172	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
173	comm_inter, status, ierr )
174	!
175	!-- Send the momentum flux (u) at bottom surface to the ocean
176	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
177	comm_inter, ierr )
178	!
179	!-- Send the momentum flux (v) at bottom surface to the ocean
180	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
181	comm_inter, ierr )
182	!
183	!-- Receive u at the bottom surface from the ocean
184	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
185	comm_inter, status, ierr )
186	!
187	!-- Receive v at the bottom surface from the ocean
188	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
189	comm_inter, status, ierr )
190	!
191	!-- Horizontal grid size or number of processors differs between
192	!-- ocean and atmosphere
193	ELSE
194
195	!
196	!-- Send heat flux at bottom surface to the ocean
197	total_2d_a = 0.0
198	total_2d = 0.0
199	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
200
201	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
202	comm2d, ierr )
203	CALL interpolate_to_ocean( 12 )
204	!
205	!-- Send humidity flux at bottom surface to the ocean
206	IF ( humidity ) THEN
207	total_2d_a = 0.0
208	total_2d = 0.0
209	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
210
211	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
212	0, comm2d, ierr )
213	CALL interpolate_to_ocean( 13 )
214	ENDIF
215	!
216	!-- Receive temperature at the bottom surface from the ocean
217	IF ( myid == 0 ) THEN
218	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
219	target_id, 14, comm_inter, status, ierr )
220	ENDIF
221	CALL MPI_BARRIER( comm2d, ierr )
222	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
223	ierr )
224	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
225	!
226	!-- Send momentum flux (u) at bottom surface to the ocean
227	total_2d_a = 0.0
228	total_2d = 0.0
229	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
230	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
231	comm2d, ierr )
232	CALL interpolate_to_ocean( 15 )
233	!
234	!-- Send momentum flux (v) at bottom surface to the ocean
235	total_2d_a = 0.0
236	total_2d = 0.0
237	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
238	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
239	comm2d, ierr )
240	CALL interpolate_to_ocean( 16 )
241	!
242	!-- Receive u at the bottom surface from the ocean
243	IF ( myid == 0 ) THEN
244	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
245	target_id, 17, comm_inter, status, ierr )
246	ENDIF
247	CALL MPI_BARRIER( comm2d, ierr )
248	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
249	ierr )
250	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
251	!
252	!-- Receive v at the bottom surface from the ocean
253	IF ( myid == 0 ) THEN
254	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
255	target_id, 18, comm_inter, status, ierr )
256	ENDIF
257	CALL MPI_BARRIER( comm2d, ierr )
258	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
259	ierr )
260	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
261
262	ENDIF
263
264	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
265
266	!
267	!-- Horizontal grid size and number of processors is equal
268	!-- in ocean and atmosphere
269	IF ( coupling_topology == 0 ) THEN
270	!
271	!-- Receive heat flux at the sea surface (top) from the atmosphere
272	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
273	comm_inter, status, ierr )
274	!
275	!-- Receive humidity flux from the atmosphere (bottom)
276	!-- and add it to the heat flux at the sea surface (top)...
277	IF ( humidity_remote ) THEN
278	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
279	target_id, 13, comm_inter, status, ierr )
280	ENDIF
281	!
282	!-- Send sea surface temperature to the atmosphere model
283	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
284	comm_inter, ierr )
285	!
286	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
287	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
288	comm_inter, status, ierr )
289	!
290	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
291	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
292	comm_inter, status, ierr )
293	!
294	!-- Send u to the atmosphere
295	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
296	comm_inter, ierr )
297	!
298	!-- Send v to the atmosphere
299	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
300	comm_inter, ierr )
301	!
302	!-- Horizontal gridsize or number of processors differs between
303	!-- ocean and atmosphere
304	ELSE
305	!
306	!-- Receive heat flux at the sea surface (top) from the atmosphere
307	IF ( myid == 0 ) THEN
308	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
309	target_id, 12, comm_inter, status, ierr )
310	ENDIF
311	CALL MPI_BARRIER( comm2d, ierr )
312	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
313	ierr )
314	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
315	!
316	!-- Receive humidity flux at the sea surface (top) from the atmosphere
317	IF ( humidity_remote ) THEN
318	IF ( myid == 0 ) THEN
319	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
320	target_id, 13, comm_inter, status, ierr )
321	ENDIF
322	CALL MPI_BARRIER( comm2d, ierr )
323	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
324	comm2d, ierr)
325	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
326	ENDIF
327	!
328	!-- Send surface temperature to atmosphere
329	total_2d_o = 0.0
330	total_2d = 0.0
331	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
332
333	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
334	comm2d, ierr)
335	CALL interpolate_to_atmos( 14 )
336	!
337	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
338	IF ( myid == 0 ) THEN
339	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
340	target_id, 15, comm_inter, status, ierr )
341	ENDIF
342	CALL MPI_BARRIER( comm2d, ierr )
343	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
344	0, comm2d, ierr )
345	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
346	!
347	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
348	IF ( myid == 0 ) THEN
349	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
350	target_id, 16, comm_inter, status, ierr )
351	ENDIF
352	CALL MPI_BARRIER( comm2d, ierr )
353	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
354	ierr )
355	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
356	!
357	!-- Send u to atmosphere
358	total_2d_o = 0.0
359	total_2d = 0.0
360	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
361	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
362	comm2d, ierr )
363	CALL interpolate_to_atmos( 17 )
364	!
365	!-- Send v to atmosphere
366	total_2d_o = 0.0
367	total_2d = 0.0
368	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
369	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
370	comm2d, ierr )
371	CALL interpolate_to_atmos( 18 )
372
373	ENDIF
374
375	!
376	!-- Conversions of fluxes received from atmosphere
377	IF ( humidity_remote ) THEN
378	!
379	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
380	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
381	!-- /(rho_atm(=1.0)*c_p)
382	tswst = tswst + qswst_remote * 2.2626108E6 / 1005.0
383	!
384	!-- ...and convert it to a salinity flux at the sea surface (top)
385	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
386	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
387	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
388	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
389	ENDIF
390
391	!
392	!-- Adjust the kinematic heat flux with respect to ocean density
393	!-- (constants are the specific heat capacities for air and water)
394	!-- now tswst is the ocean top heat flux
395	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
396
397	!
398	!-- Adjust the momentum fluxes with respect to ocean density
399	uswst = uswst / rho(nzt,:,:)
400	vswst = vswst / rho(nzt,:,:)
401
402	ENDIF
403
404	IF ( coupling_topology == 1 ) THEN
405	DEALLOCATE( total_2d_o, total_2d_a )
406	ENDIF
407
408	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
409
410	#endif
411
412	END SUBROUTINE surface_coupler
413
414
415
416	SUBROUTINE interpolate_to_atmos( tag )
417
418	#if defined( __parallel )
419
420	USE arrays_3d
421	USE control_parameters
422	USE grid_variables
423	USE indices
424	USE pegrid
425
426	IMPLICIT NONE
427
428	INTEGER :: dnx, dnx2, dny, dny2, i, ii, j, jj
429	INTEGER, intent(in) :: tag
430
431	CALL MPI_BARRIER( comm2d, ierr )
432
433	IF ( myid == 0 ) THEN
434	!
435	!-- Cyclic boundary conditions for the total 2D-grid
436	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
437	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
438
439	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
440	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
441
442	!
443	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
444	dnx = (nx_o+1) / (nx_a+1)
445	dny = (ny_o+1) / (ny_a+1)
446
447	!
448	!-- Distance for interpolation around coarse grid points within the fine
449	!-- grid (note: 2*dnx2 must not be equal with dnx)
450	dnx2 = 2 * ( dnx / 2 )
451	dny2 = 2 * ( dny / 2 )
452
453	total_2d_a = 0.0
454	!
455	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
456	DO j = 0, ny_a
457	DO i = 0, nx_a
458	DO jj = 0, dny2
459	DO ii = 0, dnx2
460	total_2d_a(j,i) = total_2d_a(j,i) &
461	+ total_2d_o(jdny+jj,idnx+ii)
462	ENDDO
463	ENDDO
464	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
465	ENDDO
466	ENDDO
467	!
468	!-- Cyclic boundary conditions for atmosphere grid
469	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
470	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
471
472	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
473	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
474	!
475	!-- Transfer of the atmosphere-grid-layer to the atmosphere
476	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
477	tag, comm_inter, ierr )
478
479	ENDIF
480
481	CALL MPI_BARRIER( comm2d, ierr )
482
483	#endif
484
485	END SUBROUTINE interpolate_to_atmos
486
487
488	SUBROUTINE interpolate_to_ocean( tag )
489
490	#if defined( __parallel )
491
492	USE arrays_3d
493	USE control_parameters
494	USE grid_variables
495	USE indices
496	USE pegrid
497
498	IMPLICIT NONE
499
500	INTEGER :: dnx, dny, i, ii, j, jj
501	INTEGER, intent(in) :: tag
502	REAL :: fl, fr, myl, myr
503
504
505	CALL MPI_BARRIER( comm2d, ierr )
506
507	IF ( myid == 0 ) THEN
508
509	!
510	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
511	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
512	dny = ( ny_o + 1 ) / ( ny_a + 1 )
513
514	!
515	!-- Cyclic boundary conditions for atmosphere grid
516	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
517	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
518
519	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
520	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
521	!
522	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
523	DO j = 0, ny
524	DO i = 0, nx
525	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
526	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
527	DO jj = 0, dny-1
528	fl = myl*jj + total_2d_a(j,i)
529	fr = myr*jj + total_2d_a(j,i+1)
530	DO ii = 0, dnx-1
531	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
532	ENDDO
533	ENDDO
534	ENDDO
535	ENDDO
536	!
537	!-- Cyclic boundary conditions for ocean grid
538	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
539	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
540
541	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
542	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
543
544	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
545	target_id, tag, comm_inter, ierr )
546
547	ENDIF
548
549	CALL MPI_BARRIER( comm2d, ierr )
550
551	#endif
552
553	END SUBROUTINE interpolate_to_ocean

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