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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1324

Last change on this file since 1324 was 1324, checked in by suehring, 10 years ago
Bugfixes in ONLY statements
Property svn:keywords set to `Id`
File size: 21.2 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 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	! Bugfix: ONLY statement for module pegrid removed
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 1324 2014-03-21 09:13:16Z suehring $
27	!
28	! 1322 2014-03-20 16:38:49Z raasch
29	! REAL constants defined as wp-kind
30	!
31	! 1320 2014-03-20 08:40:49Z raasch
32	! ONLY-attribute added to USE-statements,
33	! kind-parameters added to all INTEGER and REAL declaration statements,
34	! kinds are defined in new module kinds,
35	! old module precision_kind is removed,
36	! revision history before 2012 removed,
37	! comment fields (!:) to be used for variable explanations added to
38	! all variable declaration statements
39	!
40	! 1318 2014-03-17 13:35:16Z raasch
41	! module interfaces removed
42	!
43	! 1092 2013-02-02 11:24:22Z raasch
44	! unused variables removed
45	!
46	! 1036 2012-10-22 13:43:42Z raasch
47	! code put under GPL (PALM 3.9)
48	!
49	! 880 2012-04-13 06:28:59Z raasch
50	! Bugfix: preprocessor statements for parallel execution added
51	!
52	! 109 2007-08-28 15:26:47Z letzel
53	! Initial revision
54	!
55	! Description:
56	! ------------
57	! Data exchange at the interface between coupled models
58	!------------------------------------------------------------------------------!
59
60	USE arrays_3d, &
61	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
62	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
63
64	USE control_parameters, &
65	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
66	humidity, humidity_remote, message_string, terminate_coupled, &
67	terminate_coupled_remote, time_since_reference_point
68
69	USE cpulog, &
70	ONLY: cpu_log, log_point
71
72	USE indices, &
73	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
74	nysg, ny_a, ny_o, nzt
75
76	USE kinds
77
78	USE pegrid
79
80	IMPLICIT NONE
81
82	REAL(wp) :: time_since_reference_point_rem !:
83	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
84
85	#if defined( __parallel )
86
87	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
88
89
90
91	!
92	!-- In case of model termination initiated by the remote model
93	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
94	!-- The rest of the coupler must then be skipped because it would cause an MPI
95	!-- intercomminucation hang.
96	!-- If necessary, the coupler will be called at the beginning of the next
97	!-- restart run.
98
99	IF ( coupling_topology == 0 ) THEN
100	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
101	0, &
102	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
103	0, comm_inter, status, ierr )
104	ELSE
105	IF ( myid == 0) THEN
106	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
107	target_id, 0, &
108	terminate_coupled_remote, 1, MPI_INTEGER, &
109	target_id, 0, &
110	comm_inter, status, ierr )
111	ENDIF
112	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
113	ierr )
114
115	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
116	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
117
118	ENDIF
119
120	IF ( terminate_coupled_remote > 0 ) THEN
121	WRITE( message_string, * ) 'remote model "', &
122	TRIM( coupling_mode_remote ), &
123	'" terminated', &
124	'&with terminate_coupled_remote = ', &
125	terminate_coupled_remote, &
126	'&local model "', TRIM( coupling_mode ), &
127	'" has', &
128	'&terminate_coupled = ', &
129	terminate_coupled
130	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
131	RETURN
132	ENDIF
133
134
135	!
136	!-- Exchange the current simulated time between the models,
137	!-- currently just for total_2ding
138	IF ( coupling_topology == 0 ) THEN
139
140	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
141	comm_inter, ierr )
142	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
143	11, comm_inter, status, ierr )
144	ELSE
145
146	IF ( myid == 0 ) THEN
147
148	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
149	11, comm_inter, ierr )
150	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
151	target_id, 11, comm_inter, status, ierr )
152
153	ENDIF
154
155	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
156	ierr )
157
158	ENDIF
159
160	!
161	!-- Exchange the interface data
162	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
163
164	!
165	!-- Horizontal grid size and number of processors is equal in ocean and
166	!-- atmosphere
167	IF ( coupling_topology == 0 ) THEN
168
169	!
170	!-- Send heat flux at bottom surface to the ocean
171	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
172	comm_inter, ierr )
173	!
174	!-- Send humidity flux at bottom surface to the ocean
175	IF ( humidity ) THEN
176	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
177	comm_inter, ierr )
178	ENDIF
179	!
180	!-- Receive temperature at the bottom surface from the ocean
181	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
182	comm_inter, status, ierr )
183	!
184	!-- Send the momentum flux (u) at bottom surface to the ocean
185	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
186	comm_inter, ierr )
187	!
188	!-- Send the momentum flux (v) at bottom surface to the ocean
189	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
190	comm_inter, ierr )
191	!
192	!-- Receive u at the bottom surface from the ocean
193	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
194	comm_inter, status, ierr )
195	!
196	!-- Receive v at the bottom surface from the ocean
197	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
198	comm_inter, status, ierr )
199	!
200	!-- Horizontal grid size or number of processors differs between
201	!-- ocean and atmosphere
202	ELSE
203
204	!
205	!-- Send heat flux at bottom surface to the ocean
206	total_2d_a = 0.0
207	total_2d = 0.0
208	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
209
210	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
211	comm2d, ierr )
212	CALL interpolate_to_ocean( 12 )
213	!
214	!-- Send humidity flux at bottom surface to the ocean
215	IF ( humidity ) THEN
216	total_2d_a = 0.0
217	total_2d = 0.0
218	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
219
220	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
221	0, comm2d, ierr )
222	CALL interpolate_to_ocean( 13 )
223	ENDIF
224	!
225	!-- Receive temperature at the bottom surface from the ocean
226	IF ( myid == 0 ) THEN
227	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
228	target_id, 14, comm_inter, status, ierr )
229	ENDIF
230	CALL MPI_BARRIER( comm2d, ierr )
231	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
232	ierr )
233	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
234	!
235	!-- Send momentum flux (u) at bottom surface to the ocean
236	total_2d_a = 0.0
237	total_2d = 0.0
238	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
239	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
240	comm2d, ierr )
241	CALL interpolate_to_ocean( 15 )
242	!
243	!-- Send momentum flux (v) at bottom surface to the ocean
244	total_2d_a = 0.0
245	total_2d = 0.0
246	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
247	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
248	comm2d, ierr )
249	CALL interpolate_to_ocean( 16 )
250	!
251	!-- Receive u at the bottom surface from the ocean
252	IF ( myid == 0 ) THEN
253	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
254	target_id, 17, comm_inter, status, ierr )
255	ENDIF
256	CALL MPI_BARRIER( comm2d, ierr )
257	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
258	ierr )
259	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
260	!
261	!-- Receive v at the bottom surface from the ocean
262	IF ( myid == 0 ) THEN
263	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
264	target_id, 18, comm_inter, status, ierr )
265	ENDIF
266	CALL MPI_BARRIER( comm2d, ierr )
267	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
268	ierr )
269	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
270
271	ENDIF
272
273	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
274
275	!
276	!-- Horizontal grid size and number of processors is equal
277	!-- in ocean and atmosphere
278	IF ( coupling_topology == 0 ) THEN
279	!
280	!-- Receive heat flux at the sea surface (top) from the atmosphere
281	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
282	comm_inter, status, ierr )
283	!
284	!-- Receive humidity flux from the atmosphere (bottom)
285	!-- and add it to the heat flux at the sea surface (top)...
286	IF ( humidity_remote ) THEN
287	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
288	target_id, 13, comm_inter, status, ierr )
289	ENDIF
290	!
291	!-- Send sea surface temperature to the atmosphere model
292	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
293	comm_inter, ierr )
294	!
295	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
296	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
297	comm_inter, status, ierr )
298	!
299	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
300	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
301	comm_inter, status, ierr )
302	!
303	!-- Send u to the atmosphere
304	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
305	comm_inter, ierr )
306	!
307	!-- Send v to the atmosphere
308	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
309	comm_inter, ierr )
310	!
311	!-- Horizontal gridsize or number of processors differs between
312	!-- ocean and atmosphere
313	ELSE
314	!
315	!-- Receive heat flux at the sea surface (top) from the atmosphere
316	IF ( myid == 0 ) THEN
317	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
318	target_id, 12, comm_inter, status, ierr )
319	ENDIF
320	CALL MPI_BARRIER( comm2d, ierr )
321	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
322	ierr )
323	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
324	!
325	!-- Receive humidity flux at the sea surface (top) from the atmosphere
326	IF ( humidity_remote ) THEN
327	IF ( myid == 0 ) THEN
328	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
329	target_id, 13, comm_inter, status, ierr )
330	ENDIF
331	CALL MPI_BARRIER( comm2d, ierr )
332	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
333	comm2d, ierr)
334	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
335	ENDIF
336	!
337	!-- Send surface temperature to atmosphere
338	total_2d_o = 0.0
339	total_2d = 0.0
340	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
341
342	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
343	comm2d, ierr)
344	CALL interpolate_to_atmos( 14 )
345	!
346	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
347	IF ( myid == 0 ) THEN
348	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
349	target_id, 15, comm_inter, status, ierr )
350	ENDIF
351	CALL MPI_BARRIER( comm2d, ierr )
352	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
353	0, comm2d, ierr )
354	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
355	!
356	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
357	IF ( myid == 0 ) THEN
358	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
359	target_id, 16, comm_inter, status, ierr )
360	ENDIF
361	CALL MPI_BARRIER( comm2d, ierr )
362	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
363	ierr )
364	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
365	!
366	!-- Send u to atmosphere
367	total_2d_o = 0.0
368	total_2d = 0.0
369	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
370	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
371	comm2d, ierr )
372	CALL interpolate_to_atmos( 17 )
373	!
374	!-- Send v to atmosphere
375	total_2d_o = 0.0
376	total_2d = 0.0
377	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
378	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
379	comm2d, ierr )
380	CALL interpolate_to_atmos( 18 )
381
382	ENDIF
383
384	!
385	!-- Conversions of fluxes received from atmosphere
386	IF ( humidity_remote ) THEN
387	!
388	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
389	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
390	!-- /(rho_atm(=1.0)*c_p)
391	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
392	!
393	!-- ...and convert it to a salinity flux at the sea surface (top)
394	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
395	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
396	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
397	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
398	ENDIF
399
400	!
401	!-- Adjust the kinematic heat flux with respect to ocean density
402	!-- (constants are the specific heat capacities for air and water)
403	!-- now tswst is the ocean top heat flux
404	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
405
406	!
407	!-- Adjust the momentum fluxes with respect to ocean density
408	uswst = uswst / rho(nzt,:,:)
409	vswst = vswst / rho(nzt,:,:)
410
411	ENDIF
412
413	IF ( coupling_topology == 1 ) THEN
414	DEALLOCATE( total_2d_o, total_2d_a )
415	ENDIF
416
417	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
418
419	#endif
420
421	END SUBROUTINE surface_coupler
422
423
424
425	SUBROUTINE interpolate_to_atmos( tag )
426
427	#if defined( __parallel )
428
429	USE arrays_3d, &
430	ONLY: total_2d_a, total_2d_o
431
432	USE indices, &
433	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
434
435	USE kinds
436
437	USE pegrid
438
439	IMPLICIT NONE
440
441	INTEGER(iwp) :: dnx !:
442	INTEGER(iwp) :: dnx2 !:
443	INTEGER(iwp) :: dny !:
444	INTEGER(iwp) :: dny2 !:
445	INTEGER(iwp) :: i !:
446	INTEGER(iwp) :: ii !:
447	INTEGER(iwp) :: j !:
448	INTEGER(iwp) :: jj !:
449
450	INTEGER(iwp), intent(in) :: tag !:
451
452	CALL MPI_BARRIER( comm2d, ierr )
453
454	IF ( myid == 0 ) THEN
455	!
456	!-- Cyclic boundary conditions for the total 2D-grid
457	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
458	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
459
460	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
461	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
462
463	!
464	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
465	dnx = (nx_o+1) / (nx_a+1)
466	dny = (ny_o+1) / (ny_a+1)
467
468	!
469	!-- Distance for interpolation around coarse grid points within the fine
470	!-- grid (note: 2*dnx2 must not be equal with dnx)
471	dnx2 = 2 * ( dnx / 2 )
472	dny2 = 2 * ( dny / 2 )
473
474	total_2d_a = 0.0
475	!
476	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
477	DO j = 0, ny_a
478	DO i = 0, nx_a
479	DO jj = 0, dny2
480	DO ii = 0, dnx2
481	total_2d_a(j,i) = total_2d_a(j,i) &
482	+ total_2d_o(jdny+jj,idnx+ii)
483	ENDDO
484	ENDDO
485	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
486	ENDDO
487	ENDDO
488	!
489	!-- Cyclic boundary conditions for atmosphere grid
490	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
491	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
492
493	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
494	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
495	!
496	!-- Transfer of the atmosphere-grid-layer to the atmosphere
497	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
498	tag, comm_inter, ierr )
499
500	ENDIF
501
502	CALL MPI_BARRIER( comm2d, ierr )
503
504	#endif
505
506	END SUBROUTINE interpolate_to_atmos
507
508
509	SUBROUTINE interpolate_to_ocean( tag )
510
511	#if defined( __parallel )
512
513	USE arrays_3d, &
514	ONLY: total_2d_a, total_2d_o
515
516	USE indices, &
517	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
518
519	USE kinds
520
521	USE pegrid
522
523	IMPLICIT NONE
524
525	INTEGER(iwp) :: dnx !:
526	INTEGER(iwp) :: dny !:
527	INTEGER(iwp) :: i !:
528	INTEGER(iwp) :: ii !:
529	INTEGER(iwp) :: j !:
530	INTEGER(iwp) :: jj !:
531	INTEGER(iwp), intent(in) :: tag !:
532
533	REAL(wp) :: fl !:
534	REAL(wp) :: fr !:
535	REAL(wp) :: myl !:
536	REAL(wp) :: myr !:
537
538	CALL MPI_BARRIER( comm2d, ierr )
539
540	IF ( myid == 0 ) THEN
541
542	!
543	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
544	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
545	dny = ( ny_o + 1 ) / ( ny_a + 1 )
546
547	!
548	!-- Cyclic boundary conditions for atmosphere grid
549	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
550	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
551
552	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
553	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
554	!
555	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
556	DO j = 0, ny
557	DO i = 0, nx
558	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
559	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
560	DO jj = 0, dny-1
561	fl = myl*jj + total_2d_a(j,i)
562	fr = myr*jj + total_2d_a(j,i+1)
563	DO ii = 0, dnx-1
564	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
565	ENDDO
566	ENDDO
567	ENDDO
568	ENDDO
569	!
570	!-- Cyclic boundary conditions for ocean grid
571	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
572	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
573
574	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
575	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
576
577	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
578	target_id, tag, comm_inter, ierr )
579
580	ENDIF
581
582	CALL MPI_BARRIER( comm2d, ierr )
583
584	#endif
585
586	END SUBROUTINE interpolate_to_ocean

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