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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1336

Last change on this file since 1336 was 1325, checked in by suehring, 11 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	! Former revisions:
24	! -----------------
25	! $Id: surface_coupler.f90 1325 2014-03-21 09:21:15Z raasch $
26	!
27	! 1324 2014-03-21 09:13:16Z suehring
28	! Bugfix: ONLY statement for module pegrid removed
29	!
30	! 1322 2014-03-20 16:38:49Z raasch
31	! REAL constants defined as wp-kind
32	!
33	! 1320 2014-03-20 08:40:49Z raasch
34	! ONLY-attribute added to USE-statements,
35	! kind-parameters added to all INTEGER and REAL declaration statements,
36	! kinds are defined in new module kinds,
37	! old module precision_kind is removed,
38	! revision history before 2012 removed,
39	! comment fields (!:) to be used for variable explanations added to
40	! all variable declaration statements
41	!
42	! 1318 2014-03-17 13:35:16Z raasch
43	! module interfaces removed
44	!
45	! 1092 2013-02-02 11:24:22Z raasch
46	! unused variables removed
47	!
48	! 1036 2012-10-22 13:43:42Z raasch
49	! code put under GPL (PALM 3.9)
50	!
51	! 880 2012-04-13 06:28:59Z raasch
52	! Bugfix: preprocessor statements for parallel execution added
53	!
54	! 109 2007-08-28 15:26:47Z letzel
55	! Initial revision
56	!
57	! Description:
58	! ------------
59	! Data exchange at the interface between coupled models
60	!------------------------------------------------------------------------------!
61
62	USE arrays_3d, &
63	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
64	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
65
66	USE control_parameters, &
67	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
68	humidity, humidity_remote, message_string, terminate_coupled, &
69	terminate_coupled_remote, time_since_reference_point
70
71	USE cpulog, &
72	ONLY: cpu_log, log_point
73
74	USE indices, &
75	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
76	nysg, ny_a, ny_o, nzt
77
78	USE kinds
79
80	USE pegrid
81
82	IMPLICIT NONE
83
84	REAL(wp) :: time_since_reference_point_rem !:
85	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
86
87	#if defined( __parallel )
88
89	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
90
91
92
93	!
94	!-- In case of model termination initiated by the remote model
95	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
96	!-- The rest of the coupler must then be skipped because it would cause an MPI
97	!-- intercomminucation hang.
98	!-- If necessary, the coupler will be called at the beginning of the next
99	!-- restart run.
100
101	IF ( coupling_topology == 0 ) THEN
102	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
103	0, &
104	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
105	0, comm_inter, status, ierr )
106	ELSE
107	IF ( myid == 0) THEN
108	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
109	target_id, 0, &
110	terminate_coupled_remote, 1, MPI_INTEGER, &
111	target_id, 0, &
112	comm_inter, status, ierr )
113	ENDIF
114	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
115	ierr )
116
117	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
118	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
119
120	ENDIF
121
122	IF ( terminate_coupled_remote > 0 ) THEN
123	WRITE( message_string, * ) 'remote model "', &
124	TRIM( coupling_mode_remote ), &
125	'" terminated', &
126	'&with terminate_coupled_remote = ', &
127	terminate_coupled_remote, &
128	'&local model "', TRIM( coupling_mode ), &
129	'" has', &
130	'&terminate_coupled = ', &
131	terminate_coupled
132	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
133	RETURN
134	ENDIF
135
136
137	!
138	!-- Exchange the current simulated time between the models,
139	!-- currently just for total_2ding
140	IF ( coupling_topology == 0 ) THEN
141
142	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
143	comm_inter, ierr )
144	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
145	11, comm_inter, status, ierr )
146	ELSE
147
148	IF ( myid == 0 ) THEN
149
150	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
151	11, comm_inter, ierr )
152	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
153	target_id, 11, comm_inter, status, ierr )
154
155	ENDIF
156
157	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
158	ierr )
159
160	ENDIF
161
162	!
163	!-- Exchange the interface data
164	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
165
166	!
167	!-- Horizontal grid size and number of processors is equal in ocean and
168	!-- atmosphere
169	IF ( coupling_topology == 0 ) THEN
170
171	!
172	!-- Send heat flux at bottom surface to the ocean
173	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
174	comm_inter, ierr )
175	!
176	!-- Send humidity flux at bottom surface to the ocean
177	IF ( humidity ) THEN
178	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
179	comm_inter, ierr )
180	ENDIF
181	!
182	!-- Receive temperature at the bottom surface from the ocean
183	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
184	comm_inter, status, ierr )
185	!
186	!-- Send the momentum flux (u) at bottom surface to the ocean
187	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
188	comm_inter, ierr )
189	!
190	!-- Send the momentum flux (v) at bottom surface to the ocean
191	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
192	comm_inter, ierr )
193	!
194	!-- Receive u at the bottom surface from the ocean
195	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
196	comm_inter, status, ierr )
197	!
198	!-- Receive v at the bottom surface from the ocean
199	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
200	comm_inter, status, ierr )
201	!
202	!-- Horizontal grid size or number of processors differs between
203	!-- ocean and atmosphere
204	ELSE
205
206	!
207	!-- Send heat flux at bottom surface to the ocean
208	total_2d_a = 0.0
209	total_2d = 0.0
210	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
211
212	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
213	comm2d, ierr )
214	CALL interpolate_to_ocean( 12 )
215	!
216	!-- Send humidity flux at bottom surface to the ocean
217	IF ( humidity ) THEN
218	total_2d_a = 0.0
219	total_2d = 0.0
220	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
221
222	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
223	0, comm2d, ierr )
224	CALL interpolate_to_ocean( 13 )
225	ENDIF
226	!
227	!-- Receive temperature at the bottom surface from the ocean
228	IF ( myid == 0 ) THEN
229	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
230	target_id, 14, comm_inter, status, ierr )
231	ENDIF
232	CALL MPI_BARRIER( comm2d, ierr )
233	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
234	ierr )
235	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
236	!
237	!-- Send momentum flux (u) at bottom surface to the ocean
238	total_2d_a = 0.0
239	total_2d = 0.0
240	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
241	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
242	comm2d, ierr )
243	CALL interpolate_to_ocean( 15 )
244	!
245	!-- Send momentum flux (v) at bottom surface to the ocean
246	total_2d_a = 0.0
247	total_2d = 0.0
248	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
249	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
250	comm2d, ierr )
251	CALL interpolate_to_ocean( 16 )
252	!
253	!-- Receive u at the bottom surface from the ocean
254	IF ( myid == 0 ) THEN
255	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
256	target_id, 17, comm_inter, status, ierr )
257	ENDIF
258	CALL MPI_BARRIER( comm2d, ierr )
259	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
260	ierr )
261	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
262	!
263	!-- Receive v at the bottom surface from the ocean
264	IF ( myid == 0 ) THEN
265	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
266	target_id, 18, comm_inter, status, ierr )
267	ENDIF
268	CALL MPI_BARRIER( comm2d, ierr )
269	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
270	ierr )
271	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
272
273	ENDIF
274
275	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
276
277	!
278	!-- Horizontal grid size and number of processors is equal
279	!-- in ocean and atmosphere
280	IF ( coupling_topology == 0 ) THEN
281	!
282	!-- Receive heat flux at the sea surface (top) from the atmosphere
283	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
284	comm_inter, status, ierr )
285	!
286	!-- Receive humidity flux from the atmosphere (bottom)
287	!-- and add it to the heat flux at the sea surface (top)...
288	IF ( humidity_remote ) THEN
289	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
290	target_id, 13, comm_inter, status, ierr )
291	ENDIF
292	!
293	!-- Send sea surface temperature to the atmosphere model
294	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
295	comm_inter, ierr )
296	!
297	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
298	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
299	comm_inter, status, ierr )
300	!
301	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
302	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
303	comm_inter, status, ierr )
304	!
305	!-- Send u to the atmosphere
306	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
307	comm_inter, ierr )
308	!
309	!-- Send v to the atmosphere
310	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
311	comm_inter, ierr )
312	!
313	!-- Horizontal gridsize or number of processors differs between
314	!-- ocean and atmosphere
315	ELSE
316	!
317	!-- Receive heat flux at the sea surface (top) from the atmosphere
318	IF ( myid == 0 ) THEN
319	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
320	target_id, 12, 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, comm2d, &
324	ierr )
325	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
326	!
327	!-- Receive humidity flux at the sea surface (top) from the atmosphere
328	IF ( humidity_remote ) THEN
329	IF ( myid == 0 ) THEN
330	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
331	target_id, 13, comm_inter, status, ierr )
332	ENDIF
333	CALL MPI_BARRIER( comm2d, ierr )
334	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
335	comm2d, ierr)
336	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
337	ENDIF
338	!
339	!-- Send surface temperature to atmosphere
340	total_2d_o = 0.0
341	total_2d = 0.0
342	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
343
344	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
345	comm2d, ierr)
346	CALL interpolate_to_atmos( 14 )
347	!
348	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
349	IF ( myid == 0 ) THEN
350	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
351	target_id, 15, comm_inter, status, ierr )
352	ENDIF
353	CALL MPI_BARRIER( comm2d, ierr )
354	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
355	0, comm2d, ierr )
356	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
357	!
358	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
359	IF ( myid == 0 ) THEN
360	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
361	target_id, 16, comm_inter, status, ierr )
362	ENDIF
363	CALL MPI_BARRIER( comm2d, ierr )
364	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
365	ierr )
366	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
367	!
368	!-- Send u to atmosphere
369	total_2d_o = 0.0
370	total_2d = 0.0
371	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
372	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
373	comm2d, ierr )
374	CALL interpolate_to_atmos( 17 )
375	!
376	!-- Send v to atmosphere
377	total_2d_o = 0.0
378	total_2d = 0.0
379	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
380	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
381	comm2d, ierr )
382	CALL interpolate_to_atmos( 18 )
383
384	ENDIF
385
386	!
387	!-- Conversions of fluxes received from atmosphere
388	IF ( humidity_remote ) THEN
389	!
390	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
391	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
392	!-- /(rho_atm(=1.0)*c_p)
393	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
394	!
395	!-- ...and convert it to a salinity flux at the sea surface (top)
396	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
397	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
398	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
399	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
400	ENDIF
401
402	!
403	!-- Adjust the kinematic heat flux with respect to ocean density
404	!-- (constants are the specific heat capacities for air and water)
405	!-- now tswst is the ocean top heat flux
406	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
407
408	!
409	!-- Adjust the momentum fluxes with respect to ocean density
410	uswst = uswst / rho(nzt,:,:)
411	vswst = vswst / rho(nzt,:,:)
412
413	ENDIF
414
415	IF ( coupling_topology == 1 ) THEN
416	DEALLOCATE( total_2d_o, total_2d_a )
417	ENDIF
418
419	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
420
421	#endif
422
423	END SUBROUTINE surface_coupler
424
425
426
427	SUBROUTINE interpolate_to_atmos( tag )
428
429	#if defined( __parallel )
430
431	USE arrays_3d, &
432	ONLY: total_2d_a, total_2d_o
433
434	USE indices, &
435	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
436
437	USE kinds
438
439	USE pegrid
440
441	IMPLICIT NONE
442
443	INTEGER(iwp) :: dnx !:
444	INTEGER(iwp) :: dnx2 !:
445	INTEGER(iwp) :: dny !:
446	INTEGER(iwp) :: dny2 !:
447	INTEGER(iwp) :: i !:
448	INTEGER(iwp) :: ii !:
449	INTEGER(iwp) :: j !:
450	INTEGER(iwp) :: jj !:
451
452	INTEGER(iwp), intent(in) :: tag !:
453
454	CALL MPI_BARRIER( comm2d, ierr )
455
456	IF ( myid == 0 ) THEN
457	!
458	!-- Cyclic boundary conditions for the total 2D-grid
459	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
460	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
461
462	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
463	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
464
465	!
466	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
467	dnx = (nx_o+1) / (nx_a+1)
468	dny = (ny_o+1) / (ny_a+1)
469
470	!
471	!-- Distance for interpolation around coarse grid points within the fine
472	!-- grid (note: 2*dnx2 must not be equal with dnx)
473	dnx2 = 2 * ( dnx / 2 )
474	dny2 = 2 * ( dny / 2 )
475
476	total_2d_a = 0.0
477	!
478	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
479	DO j = 0, ny_a
480	DO i = 0, nx_a
481	DO jj = 0, dny2
482	DO ii = 0, dnx2
483	total_2d_a(j,i) = total_2d_a(j,i) &
484	+ total_2d_o(jdny+jj,idnx+ii)
485	ENDDO
486	ENDDO
487	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
488	ENDDO
489	ENDDO
490	!
491	!-- Cyclic boundary conditions for atmosphere grid
492	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
493	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
494
495	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
496	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
497	!
498	!-- Transfer of the atmosphere-grid-layer to the atmosphere
499	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
500	tag, comm_inter, ierr )
501
502	ENDIF
503
504	CALL MPI_BARRIER( comm2d, ierr )
505
506	#endif
507
508	END SUBROUTINE interpolate_to_atmos
509
510
511	SUBROUTINE interpolate_to_ocean( tag )
512
513	#if defined( __parallel )
514
515	USE arrays_3d, &
516	ONLY: total_2d_a, total_2d_o
517
518	USE indices, &
519	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
520
521	USE kinds
522
523	USE pegrid
524
525	IMPLICIT NONE
526
527	INTEGER(iwp) :: dnx !:
528	INTEGER(iwp) :: dny !:
529	INTEGER(iwp) :: i !:
530	INTEGER(iwp) :: ii !:
531	INTEGER(iwp) :: j !:
532	INTEGER(iwp) :: jj !:
533	INTEGER(iwp), intent(in) :: tag !:
534
535	REAL(wp) :: fl !:
536	REAL(wp) :: fr !:
537	REAL(wp) :: myl !:
538	REAL(wp) :: myr !:
539
540	CALL MPI_BARRIER( comm2d, ierr )
541
542	IF ( myid == 0 ) THEN
543
544	!
545	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
546	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
547	dny = ( ny_o + 1 ) / ( ny_a + 1 )
548
549	!
550	!-- Cyclic boundary conditions for atmosphere grid
551	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
552	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
553
554	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
555	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
556	!
557	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
558	DO j = 0, ny
559	DO i = 0, nx
560	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
561	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
562	DO jj = 0, dny-1
563	fl = myl*jj + total_2d_a(j,i)
564	fr = myr*jj + total_2d_a(j,i+1)
565	DO ii = 0, dnx-1
566	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
567	ENDDO
568	ENDDO
569	ENDDO
570	ENDDO
571	!
572	!-- Cyclic boundary conditions for ocean grid
573	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
574	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
575
576	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
577	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
578
579	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
580	target_id, tag, comm_inter, ierr )
581
582	ENDIF
583
584	CALL MPI_BARRIER( comm2d, ierr )
585
586	#endif
587
588	END SUBROUTINE interpolate_to_ocean

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