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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1320

Last change on this file since 1320 was 1320, checked in by raasch, 10 years ago
ONLY-attribute added to USE-statements, kind-parameters added to all INTEGER and REAL declaration statements, kinds are defined in new module kinds, old module precision_kind is removed, revision history before 2012 removed, comment fields (!:) to be used for variable explanations added to all variable declaration statements
Property svn:keywords set to `Id`
File size: 21.4 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 1997-2014 Leibniz Universitaet Hannover
18	!--------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	! ONLY-attribute added to USE-statements,
23	! kind-parameters added to all INTEGER and REAL declaration statements,
24	! kinds are defined in new module kinds,
25	! old module precision_kind is removed,
26	! revision history before 2012 removed,
27	! comment fields (!:) to be used for variable explanations added to
28	! all variable declaration statements
29	!
30	! Former revisions:
31	! -----------------
32	! $Id: surface_coupler.f90 1320 2014-03-20 08:40:49Z raasch $
33	!
34	! 1318 2014-03-17 13:35:16Z raasch
35	! module interfaces removed
36	!
37	! 1092 2013-02-02 11:24:22Z raasch
38	! unused variables removed
39	!
40	! 1036 2012-10-22 13:43:42Z raasch
41	! code put under GPL (PALM 3.9)
42	!
43	! 880 2012-04-13 06:28:59Z raasch
44	! Bugfix: preprocessor statements for parallel execution added
45	!
46	! 109 2007-08-28 15:26:47Z letzel
47	! Initial revision
48	!
49	! Description:
50	! ------------
51	! Data exchange at the interface between coupled models
52	!------------------------------------------------------------------------------!
53
54	USE arrays_3d, &
55	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
56	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
57
58	USE control_parameters, &
59	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
60	humidity, humidity_remote, message_string, terminate_coupled, &
61	terminate_coupled_remote, time_since_reference_point
62
63	USE cpulog, &
64	ONLY: cpu_log, log_point
65
66	USE indices, &
67	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
68	nysg, ny_a, ny_o, nzt
69
70	USE kinds
71
72	USE pegrid
73
74	IMPLICIT NONE
75
76	REAL(wp) :: time_since_reference_point_rem !:
77	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
78
79	#if defined( __parallel )
80
81	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
82
83
84
85	!
86	!-- In case of model termination initiated by the remote model
87	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
88	!-- The rest of the coupler must then be skipped because it would cause an MPI
89	!-- intercomminucation hang.
90	!-- If necessary, the coupler will be called at the beginning of the next
91	!-- restart run.
92
93	IF ( coupling_topology == 0 ) THEN
94	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
95	0, &
96	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
97	0, comm_inter, status, ierr )
98	ELSE
99	IF ( myid == 0) THEN
100	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
101	target_id, 0, &
102	terminate_coupled_remote, 1, MPI_INTEGER, &
103	target_id, 0, &
104	comm_inter, status, ierr )
105	ENDIF
106	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
107	ierr )
108
109	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
110	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
111
112	ENDIF
113
114	IF ( terminate_coupled_remote > 0 ) THEN
115	WRITE( message_string, * ) 'remote model "', &
116	TRIM( coupling_mode_remote ), &
117	'" terminated', &
118	'&with terminate_coupled_remote = ', &
119	terminate_coupled_remote, &
120	'&local model "', TRIM( coupling_mode ), &
121	'" has', &
122	'&terminate_coupled = ', &
123	terminate_coupled
124	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
125	RETURN
126	ENDIF
127
128
129	!
130	!-- Exchange the current simulated time between the models,
131	!-- currently just for total_2ding
132	IF ( coupling_topology == 0 ) THEN
133
134	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
135	comm_inter, ierr )
136	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
137	11, comm_inter, status, ierr )
138	ELSE
139
140	IF ( myid == 0 ) THEN
141
142	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
143	11, comm_inter, ierr )
144	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
145	target_id, 11, comm_inter, status, ierr )
146
147	ENDIF
148
149	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
150	ierr )
151
152	ENDIF
153
154	!
155	!-- Exchange the interface data
156	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
157
158	!
159	!-- Horizontal grid size and number of processors is equal in ocean and
160	!-- atmosphere
161	IF ( coupling_topology == 0 ) THEN
162
163	!
164	!-- Send heat flux at bottom surface to the ocean
165	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
166	comm_inter, ierr )
167	!
168	!-- Send humidity flux at bottom surface to the ocean
169	IF ( humidity ) THEN
170	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
171	comm_inter, ierr )
172	ENDIF
173	!
174	!-- Receive temperature at the bottom surface from the ocean
175	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
176	comm_inter, status, ierr )
177	!
178	!-- Send the momentum flux (u) at bottom surface to the ocean
179	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
180	comm_inter, ierr )
181	!
182	!-- Send the momentum flux (v) at bottom surface to the ocean
183	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
184	comm_inter, ierr )
185	!
186	!-- Receive u at the bottom surface from the ocean
187	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
188	comm_inter, status, ierr )
189	!
190	!-- Receive v at the bottom surface from the ocean
191	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
192	comm_inter, status, ierr )
193	!
194	!-- Horizontal grid size or number of processors differs between
195	!-- ocean and atmosphere
196	ELSE
197
198	!
199	!-- Send heat flux at bottom surface to the ocean
200	total_2d_a = 0.0
201	total_2d = 0.0
202	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
203
204	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
205	comm2d, ierr )
206	CALL interpolate_to_ocean( 12 )
207	!
208	!-- Send humidity flux at bottom surface to the ocean
209	IF ( humidity ) THEN
210	total_2d_a = 0.0
211	total_2d = 0.0
212	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
213
214	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
215	0, comm2d, ierr )
216	CALL interpolate_to_ocean( 13 )
217	ENDIF
218	!
219	!-- Receive temperature at the bottom surface from the ocean
220	IF ( myid == 0 ) THEN
221	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
222	target_id, 14, comm_inter, status, ierr )
223	ENDIF
224	CALL MPI_BARRIER( comm2d, ierr )
225	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
226	ierr )
227	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
228	!
229	!-- Send momentum flux (u) at bottom surface to the ocean
230	total_2d_a = 0.0
231	total_2d = 0.0
232	total_2d(nys:nyn,nxl:nxr) = usws(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( 15 )
236	!
237	!-- Send momentum flux (v) at bottom surface to the ocean
238	total_2d_a = 0.0
239	total_2d = 0.0
240	total_2d(nys:nyn,nxl:nxr) = vsws(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( 16 )
244	!
245	!-- Receive u at the bottom surface from the ocean
246	IF ( myid == 0 ) THEN
247	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
248	target_id, 17, comm_inter, status, ierr )
249	ENDIF
250	CALL MPI_BARRIER( comm2d, ierr )
251	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
252	ierr )
253	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
254	!
255	!-- Receive v at the bottom surface from the ocean
256	IF ( myid == 0 ) THEN
257	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
258	target_id, 18, comm_inter, status, ierr )
259	ENDIF
260	CALL MPI_BARRIER( comm2d, ierr )
261	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
262	ierr )
263	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
264
265	ENDIF
266
267	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
268
269	!
270	!-- Horizontal grid size and number of processors is equal
271	!-- in ocean and atmosphere
272	IF ( coupling_topology == 0 ) THEN
273	!
274	!-- Receive heat flux at the sea surface (top) from the atmosphere
275	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
276	comm_inter, status, ierr )
277	!
278	!-- Receive humidity flux from the atmosphere (bottom)
279	!-- and add it to the heat flux at the sea surface (top)...
280	IF ( humidity_remote ) THEN
281	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
282	target_id, 13, comm_inter, status, ierr )
283	ENDIF
284	!
285	!-- Send sea surface temperature to the atmosphere model
286	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
287	comm_inter, ierr )
288	!
289	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
290	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
291	comm_inter, status, ierr )
292	!
293	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
294	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
295	comm_inter, status, ierr )
296	!
297	!-- Send u to the atmosphere
298	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
299	comm_inter, ierr )
300	!
301	!-- Send v to the atmosphere
302	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
303	comm_inter, ierr )
304	!
305	!-- Horizontal gridsize or number of processors differs between
306	!-- ocean and atmosphere
307	ELSE
308	!
309	!-- Receive heat flux at the sea surface (top) from the atmosphere
310	IF ( myid == 0 ) THEN
311	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
312	target_id, 12, comm_inter, status, ierr )
313	ENDIF
314	CALL MPI_BARRIER( comm2d, ierr )
315	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
316	ierr )
317	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
318	!
319	!-- Receive humidity flux at the sea surface (top) from the atmosphere
320	IF ( humidity_remote ) THEN
321	IF ( myid == 0 ) THEN
322	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
323	target_id, 13, comm_inter, status, ierr )
324	ENDIF
325	CALL MPI_BARRIER( comm2d, ierr )
326	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
327	comm2d, ierr)
328	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
329	ENDIF
330	!
331	!-- Send surface temperature to atmosphere
332	total_2d_o = 0.0
333	total_2d = 0.0
334	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
335
336	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
337	comm2d, ierr)
338	CALL interpolate_to_atmos( 14 )
339	!
340	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
341	IF ( myid == 0 ) THEN
342	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
343	target_id, 15, comm_inter, status, ierr )
344	ENDIF
345	CALL MPI_BARRIER( comm2d, ierr )
346	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
347	0, comm2d, ierr )
348	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
349	!
350	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
351	IF ( myid == 0 ) THEN
352	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
353	target_id, 16, comm_inter, status, ierr )
354	ENDIF
355	CALL MPI_BARRIER( comm2d, ierr )
356	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
357	ierr )
358	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
359	!
360	!-- Send u to atmosphere
361	total_2d_o = 0.0
362	total_2d = 0.0
363	total_2d(nys:nyn,nxl:nxr) = u(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( 17 )
367	!
368	!-- Send v to atmosphere
369	total_2d_o = 0.0
370	total_2d = 0.0
371	total_2d(nys:nyn,nxl:nxr) = v(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( 18 )
375
376	ENDIF
377
378	!
379	!-- Conversions of fluxes received from atmosphere
380	IF ( humidity_remote ) THEN
381	!
382	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
383	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
384	!-- /(rho_atm(=1.0)*c_p)
385	tswst = tswst + qswst_remote * 2.2626108E6 / 1005.0
386	!
387	!-- ...and convert it to a salinity flux at the sea surface (top)
388	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
389	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
390	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
391	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
392	ENDIF
393
394	!
395	!-- Adjust the kinematic heat flux with respect to ocean density
396	!-- (constants are the specific heat capacities for air and water)
397	!-- now tswst is the ocean top heat flux
398	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
399
400	!
401	!-- Adjust the momentum fluxes with respect to ocean density
402	uswst = uswst / rho(nzt,:,:)
403	vswst = vswst / rho(nzt,:,:)
404
405	ENDIF
406
407	IF ( coupling_topology == 1 ) THEN
408	DEALLOCATE( total_2d_o, total_2d_a )
409	ENDIF
410
411	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
412
413	#endif
414
415	END SUBROUTINE surface_coupler
416
417
418
419	SUBROUTINE interpolate_to_atmos( tag )
420
421	#if defined( __parallel )
422
423	USE arrays_3d, &
424	ONLY: total_2d_a, total_2d_o
425
426	USE indices, &
427	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
428
429	USE kinds
430
431	USE pegrid, &
432	ONLY: comm2d, comm_inter, ierr, MPI_DOUBLE_PRECISION, myid, ngp_a, &
433	target_id
434
435	IMPLICIT NONE
436
437	INTEGER(iwp) :: dnx !:
438	INTEGER(iwp) :: dnx2 !:
439	INTEGER(iwp) :: dny !:
440	INTEGER(iwp) :: dny2 !:
441	INTEGER(iwp) :: i !:
442	INTEGER(iwp) :: ii !:
443	INTEGER(iwp) :: j !:
444	INTEGER(iwp) :: jj !:
445
446	INTEGER(iwp), intent(in) :: tag !:
447
448	CALL MPI_BARRIER( comm2d, ierr )
449
450	IF ( myid == 0 ) THEN
451	!
452	!-- Cyclic boundary conditions for the total 2D-grid
453	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
454	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
455
456	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
457	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
458
459	!
460	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
461	dnx = (nx_o+1) / (nx_a+1)
462	dny = (ny_o+1) / (ny_a+1)
463
464	!
465	!-- Distance for interpolation around coarse grid points within the fine
466	!-- grid (note: 2*dnx2 must not be equal with dnx)
467	dnx2 = 2 * ( dnx / 2 )
468	dny2 = 2 * ( dny / 2 )
469
470	total_2d_a = 0.0
471	!
472	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
473	DO j = 0, ny_a
474	DO i = 0, nx_a
475	DO jj = 0, dny2
476	DO ii = 0, dnx2
477	total_2d_a(j,i) = total_2d_a(j,i) &
478	+ total_2d_o(jdny+jj,idnx+ii)
479	ENDDO
480	ENDDO
481	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
482	ENDDO
483	ENDDO
484	!
485	!-- Cyclic boundary conditions for atmosphere grid
486	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
487	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
488
489	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
490	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
491	!
492	!-- Transfer of the atmosphere-grid-layer to the atmosphere
493	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
494	tag, comm_inter, ierr )
495
496	ENDIF
497
498	CALL MPI_BARRIER( comm2d, ierr )
499
500	#endif
501
502	END SUBROUTINE interpolate_to_atmos
503
504
505	SUBROUTINE interpolate_to_ocean( tag )
506
507	#if defined( __parallel )
508
509	USE arrays_3d, &
510	ONLY: total_2d_a, total_2d_o
511
512	USE indices, &
513	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
514
515	USE kinds
516
517	USE pegrid, &
518	ONLY: comm2d, comm_inter, ierr, MPI_DOUBLE_PRECISION, myid, ngp_o, &
519	target_id
520
521	IMPLICIT NONE
522
523	INTEGER(iwp) :: dnx !:
524	INTEGER(iwp) :: dny !:
525	INTEGER(iwp) :: i !:
526	INTEGER(iwp) :: ii !:
527	INTEGER(iwp) :: j !:
528	INTEGER(iwp) :: jj !:
529	INTEGER(iwp), intent(in) :: tag !:
530
531	REAL(wp) :: fl !:
532	REAL(wp) :: fr !:
533	REAL(wp) :: myl !:
534	REAL(wp) :: myr !:
535
536	CALL MPI_BARRIER( comm2d, ierr )
537
538	IF ( myid == 0 ) THEN
539
540	!
541	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
542	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
543	dny = ( ny_o + 1 ) / ( ny_a + 1 )
544
545	!
546	!-- Cyclic boundary conditions for atmosphere grid
547	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
548	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
549
550	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
551	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
552	!
553	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
554	DO j = 0, ny
555	DO i = 0, nx
556	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
557	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
558	DO jj = 0, dny-1
559	fl = myl*jj + total_2d_a(j,i)
560	fr = myr*jj + total_2d_a(j,i+1)
561	DO ii = 0, dnx-1
562	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
563	ENDDO
564	ENDDO
565	ENDDO
566	ENDDO
567	!
568	!-- Cyclic boundary conditions for ocean grid
569	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
570	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
571
572	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
573	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
574
575	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
576	target_id, tag, comm_inter, ierr )
577
578	ENDIF
579
580	CALL MPI_BARRIER( comm2d, ierr )
581
582	#endif
583
584	END SUBROUTINE interpolate_to_ocean

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