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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1357

Last change on this file since 1357 was 1354, checked in by heinze, 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	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 1354 2014-04-08 15:22:57Z witha $
27	!
28	! 1353 2014-04-08 15:21:23Z heinze
29	! REAL constants provided with KIND-attribute
30	!
31	! 1324 2014-03-21 09:13:16Z suehring
32	! Bugfix: ONLY statement for module pegrid removed
33	!
34	! 1322 2014-03-20 16:38:49Z raasch
35	! REAL constants defined as wp-kind
36	!
37	! 1320 2014-03-20 08:40:49Z raasch
38	! ONLY-attribute added to USE-statements,
39	! kind-parameters added to all INTEGER and REAL declaration statements,
40	! kinds are defined in new module kinds,
41	! old module precision_kind is removed,
42	! revision history before 2012 removed,
43	! comment fields (!:) to be used for variable explanations added to
44	! all variable declaration statements
45	!
46	! 1318 2014-03-17 13:35:16Z raasch
47	! module interfaces removed
48	!
49	! 1092 2013-02-02 11:24:22Z raasch
50	! unused variables removed
51	!
52	! 1036 2012-10-22 13:43:42Z raasch
53	! code put under GPL (PALM 3.9)
54	!
55	! 880 2012-04-13 06:28:59Z raasch
56	! Bugfix: preprocessor statements for parallel execution added
57	!
58	! 109 2007-08-28 15:26:47Z letzel
59	! Initial revision
60	!
61	! Description:
62	! ------------
63	! Data exchange at the interface between coupled models
64	!------------------------------------------------------------------------------!
65
66	USE arrays_3d, &
67	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
68	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
69
70	USE control_parameters, &
71	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
72	humidity, humidity_remote, message_string, terminate_coupled, &
73	terminate_coupled_remote, time_since_reference_point
74
75	USE cpulog, &
76	ONLY: cpu_log, log_point
77
78	USE indices, &
79	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
80	nysg, ny_a, ny_o, nzt
81
82	USE kinds
83
84	USE pegrid
85
86	IMPLICIT NONE
87
88	REAL(wp) :: time_since_reference_point_rem !:
89	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
90
91	#if defined( __parallel )
92
93	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
94
95
96
97	!
98	!-- In case of model termination initiated by the remote model
99	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
100	!-- The rest of the coupler must then be skipped because it would cause an MPI
101	!-- intercomminucation hang.
102	!-- If necessary, the coupler will be called at the beginning of the next
103	!-- restart run.
104
105	IF ( coupling_topology == 0 ) THEN
106	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
107	0, &
108	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
109	0, comm_inter, status, ierr )
110	ELSE
111	IF ( myid == 0) THEN
112	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
113	target_id, 0, &
114	terminate_coupled_remote, 1, MPI_INTEGER, &
115	target_id, 0, &
116	comm_inter, status, ierr )
117	ENDIF
118	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
119	ierr )
120
121	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
122	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
123
124	ENDIF
125
126	IF ( terminate_coupled_remote > 0 ) THEN
127	WRITE( message_string, * ) 'remote model "', &
128	TRIM( coupling_mode_remote ), &
129	'" terminated', &
130	'&with terminate_coupled_remote = ', &
131	terminate_coupled_remote, &
132	'&local model "', TRIM( coupling_mode ), &
133	'" has', &
134	'&terminate_coupled = ', &
135	terminate_coupled
136	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
137	RETURN
138	ENDIF
139
140
141	!
142	!-- Exchange the current simulated time between the models,
143	!-- currently just for total_2ding
144	IF ( coupling_topology == 0 ) THEN
145
146	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
147	comm_inter, ierr )
148	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
149	11, comm_inter, status, ierr )
150	ELSE
151
152	IF ( myid == 0 ) THEN
153
154	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
155	11, comm_inter, ierr )
156	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
157	target_id, 11, comm_inter, status, ierr )
158
159	ENDIF
160
161	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
162	ierr )
163
164	ENDIF
165
166	!
167	!-- Exchange the interface data
168	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
169
170	!
171	!-- Horizontal grid size and number of processors is equal in ocean and
172	!-- atmosphere
173	IF ( coupling_topology == 0 ) THEN
174
175	!
176	!-- Send heat flux at bottom surface to the ocean
177	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
178	comm_inter, ierr )
179	!
180	!-- Send humidity flux at bottom surface to the ocean
181	IF ( humidity ) THEN
182	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
183	comm_inter, ierr )
184	ENDIF
185	!
186	!-- Receive temperature at the bottom surface from the ocean
187	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
188	comm_inter, status, ierr )
189	!
190	!-- Send the momentum flux (u) at bottom surface to the ocean
191	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
192	comm_inter, ierr )
193	!
194	!-- Send the momentum flux (v) at bottom surface to the ocean
195	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
196	comm_inter, ierr )
197	!
198	!-- Receive u at the bottom surface from the ocean
199	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
200	comm_inter, status, ierr )
201	!
202	!-- Receive v at the bottom surface from the ocean
203	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
204	comm_inter, status, ierr )
205	!
206	!-- Horizontal grid size or number of processors differs between
207	!-- ocean and atmosphere
208	ELSE
209
210	!
211	!-- Send heat flux at bottom surface to the ocean
212	total_2d_a = 0.0_wp
213	total_2d = 0.0_wp
214	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
215
216	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
217	comm2d, ierr )
218	CALL interpolate_to_ocean( 12 )
219	!
220	!-- Send humidity flux at bottom surface to the ocean
221	IF ( humidity ) THEN
222	total_2d_a = 0.0_wp
223	total_2d = 0.0_wp
224	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
225
226	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
227	0, comm2d, ierr )
228	CALL interpolate_to_ocean( 13 )
229	ENDIF
230	!
231	!-- Receive temperature at the bottom surface from the ocean
232	IF ( myid == 0 ) THEN
233	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
234	target_id, 14, comm_inter, status, ierr )
235	ENDIF
236	CALL MPI_BARRIER( comm2d, ierr )
237	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
238	ierr )
239	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
240	!
241	!-- Send momentum flux (u) at bottom surface to the ocean
242	total_2d_a = 0.0_wp
243	total_2d = 0.0_wp
244	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
245	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
246	comm2d, ierr )
247	CALL interpolate_to_ocean( 15 )
248	!
249	!-- Send momentum flux (v) at bottom surface to the ocean
250	total_2d_a = 0.0_wp
251	total_2d = 0.0_wp
252	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
253	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
254	comm2d, ierr )
255	CALL interpolate_to_ocean( 16 )
256	!
257	!-- Receive u at the bottom surface from the ocean
258	IF ( myid == 0 ) THEN
259	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
260	target_id, 17, comm_inter, status, ierr )
261	ENDIF
262	CALL MPI_BARRIER( comm2d, ierr )
263	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
264	ierr )
265	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
266	!
267	!-- Receive v at the bottom surface from the ocean
268	IF ( myid == 0 ) THEN
269	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
270	target_id, 18, comm_inter, status, ierr )
271	ENDIF
272	CALL MPI_BARRIER( comm2d, ierr )
273	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
274	ierr )
275	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
276
277	ENDIF
278
279	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
280
281	!
282	!-- Horizontal grid size and number of processors is equal
283	!-- in ocean and atmosphere
284	IF ( coupling_topology == 0 ) THEN
285	!
286	!-- Receive heat flux at the sea surface (top) from the atmosphere
287	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
288	comm_inter, status, ierr )
289	!
290	!-- Receive humidity flux from the atmosphere (bottom)
291	!-- and add it to the heat flux at the sea surface (top)...
292	IF ( humidity_remote ) THEN
293	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
294	target_id, 13, comm_inter, status, ierr )
295	ENDIF
296	!
297	!-- Send sea surface temperature to the atmosphere model
298	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
299	comm_inter, ierr )
300	!
301	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
302	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
303	comm_inter, status, ierr )
304	!
305	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
306	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
307	comm_inter, status, ierr )
308	!
309	!-- Send u to the atmosphere
310	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
311	comm_inter, ierr )
312	!
313	!-- Send v to the atmosphere
314	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
315	comm_inter, ierr )
316	!
317	!-- Horizontal gridsize or number of processors differs between
318	!-- ocean and atmosphere
319	ELSE
320	!
321	!-- Receive heat flux at the sea surface (top) from the atmosphere
322	IF ( myid == 0 ) THEN
323	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
324	target_id, 12, comm_inter, status, ierr )
325	ENDIF
326	CALL MPI_BARRIER( comm2d, ierr )
327	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
328	ierr )
329	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
330	!
331	!-- Receive humidity flux at the sea surface (top) from the atmosphere
332	IF ( humidity_remote ) THEN
333	IF ( myid == 0 ) THEN
334	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
335	target_id, 13, 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, 0, &
339	comm2d, ierr)
340	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
341	ENDIF
342	!
343	!-- Send surface temperature to atmosphere
344	total_2d_o = 0.0_wp
345	total_2d = 0.0_wp
346	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
347
348	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
349	comm2d, ierr)
350	CALL interpolate_to_atmos( 14 )
351	!
352	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
353	IF ( myid == 0 ) THEN
354	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
355	target_id, 15, comm_inter, status, ierr )
356	ENDIF
357	CALL MPI_BARRIER( comm2d, ierr )
358	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
359	0, comm2d, ierr )
360	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
361	!
362	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
363	IF ( myid == 0 ) THEN
364	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
365	target_id, 16, comm_inter, status, ierr )
366	ENDIF
367	CALL MPI_BARRIER( comm2d, ierr )
368	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
369	ierr )
370	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
371	!
372	!-- Send u to atmosphere
373	total_2d_o = 0.0_wp
374	total_2d = 0.0_wp
375	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
376	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
377	comm2d, ierr )
378	CALL interpolate_to_atmos( 17 )
379	!
380	!-- Send v to atmosphere
381	total_2d_o = 0.0_wp
382	total_2d = 0.0_wp
383	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
384	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
385	comm2d, ierr )
386	CALL interpolate_to_atmos( 18 )
387
388	ENDIF
389
390	!
391	!-- Conversions of fluxes received from atmosphere
392	IF ( humidity_remote ) THEN
393	!
394	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
395	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
396	!-- /(rho_atm(=1.0)*c_p)
397	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
398	!
399	!-- ...and convert it to a salinity flux at the sea surface (top)
400	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
401	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
402	saswst = -1.0_wp * sa(nzt,:,:) * qswst_remote / &
403	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) ) )
404	ENDIF
405
406	!
407	!-- Adjust the kinematic heat flux with respect to ocean density
408	!-- (constants are the specific heat capacities for air and water)
409	!-- now tswst is the ocean top heat flux
410	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
411
412	!
413	!-- Adjust the momentum fluxes with respect to ocean density
414	uswst = uswst / rho(nzt,:,:)
415	vswst = vswst / rho(nzt,:,:)
416
417	ENDIF
418
419	IF ( coupling_topology == 1 ) THEN
420	DEALLOCATE( total_2d_o, total_2d_a )
421	ENDIF
422
423	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
424
425	#endif
426
427	END SUBROUTINE surface_coupler
428
429
430
431	SUBROUTINE interpolate_to_atmos( tag )
432
433	#if defined( __parallel )
434
435	USE arrays_3d, &
436	ONLY: total_2d_a, total_2d_o
437
438	USE indices, &
439	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
440
441	USE kinds
442
443	USE pegrid
444
445	IMPLICIT NONE
446
447	INTEGER(iwp) :: dnx !:
448	INTEGER(iwp) :: dnx2 !:
449	INTEGER(iwp) :: dny !:
450	INTEGER(iwp) :: dny2 !:
451	INTEGER(iwp) :: i !:
452	INTEGER(iwp) :: ii !:
453	INTEGER(iwp) :: j !:
454	INTEGER(iwp) :: jj !:
455
456	INTEGER(iwp), intent(in) :: tag !:
457
458	CALL MPI_BARRIER( comm2d, ierr )
459
460	IF ( myid == 0 ) THEN
461	!
462	!-- Cyclic boundary conditions for the total 2D-grid
463	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
464	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
465
466	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
467	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
468
469	!
470	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
471	dnx = (nx_o+1) / (nx_a+1)
472	dny = (ny_o+1) / (ny_a+1)
473
474	!
475	!-- Distance for interpolation around coarse grid points within the fine
476	!-- grid (note: 2*dnx2 must not be equal with dnx)
477	dnx2 = 2 * ( dnx / 2 )
478	dny2 = 2 * ( dny / 2 )
479
480	total_2d_a = 0.0_wp
481	!
482	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
483	DO j = 0, ny_a
484	DO i = 0, nx_a
485	DO jj = 0, dny2
486	DO ii = 0, dnx2
487	total_2d_a(j,i) = total_2d_a(j,i) &
488	+ total_2d_o(jdny+jj,idnx+ii)
489	ENDDO
490	ENDDO
491	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
492	ENDDO
493	ENDDO
494	!
495	!-- Cyclic boundary conditions for atmosphere grid
496	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
497	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
498
499	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
500	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
501	!
502	!-- Transfer of the atmosphere-grid-layer to the atmosphere
503	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
504	tag, comm_inter, ierr )
505
506	ENDIF
507
508	CALL MPI_BARRIER( comm2d, ierr )
509
510	#endif
511
512	END SUBROUTINE interpolate_to_atmos
513
514
515	SUBROUTINE interpolate_to_ocean( tag )
516
517	#if defined( __parallel )
518
519	USE arrays_3d, &
520	ONLY: total_2d_a, total_2d_o
521
522	USE indices, &
523	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
524
525	USE kinds
526
527	USE pegrid
528
529	IMPLICIT NONE
530
531	INTEGER(iwp) :: dnx !:
532	INTEGER(iwp) :: dny !:
533	INTEGER(iwp) :: i !:
534	INTEGER(iwp) :: ii !:
535	INTEGER(iwp) :: j !:
536	INTEGER(iwp) :: jj !:
537	INTEGER(iwp), intent(in) :: tag !:
538
539	REAL(wp) :: fl !:
540	REAL(wp) :: fr !:
541	REAL(wp) :: myl !:
542	REAL(wp) :: myr !:
543
544	CALL MPI_BARRIER( comm2d, ierr )
545
546	IF ( myid == 0 ) THEN
547
548	!
549	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
550	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
551	dny = ( ny_o + 1 ) / ( ny_a + 1 )
552
553	!
554	!-- Cyclic boundary conditions for atmosphere grid
555	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
556	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
557
558	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
559	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
560	!
561	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
562	DO j = 0, ny
563	DO i = 0, nx
564	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
565	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
566	DO jj = 0, dny-1
567	fl = myl*jj + total_2d_a(j,i)
568	fr = myr*jj + total_2d_a(j,i+1)
569	DO ii = 0, dnx-1
570	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
571	ENDDO
572	ENDDO
573	ENDDO
574	ENDDO
575	!
576	!-- Cyclic boundary conditions for ocean grid
577	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
578	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
579
580	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
581	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
582
583	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
584	target_id, tag, comm_inter, ierr )
585
586	ENDIF
587
588	CALL MPI_BARRIER( comm2d, ierr )
589
590	#endif
591
592	END SUBROUTINE interpolate_to_ocean

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