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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1322

Last change on this file since 1322 was 1322, checked in by raasch, 10 years ago
REAL functions and a lot of REAL constants provided with KIND-attribute, some small bugfixes
Property svn:keywords set to `Id`
File size: 21.5 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	! REAL constants defined as wp-kind
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 1322 2014-03-20 16:38:49Z raasch $
27	!
28	! 1320 2014-03-20 08:40:49Z raasch
29	! ONLY-attribute added to USE-statements,
30	! kind-parameters added to all INTEGER and REAL declaration statements,
31	! kinds are defined in new module kinds,
32	! old module precision_kind is removed,
33	! revision history before 2012 removed,
34	! comment fields (!:) to be used for variable explanations added to
35	! all variable declaration statements
36	!
37	! 1318 2014-03-17 13:35:16Z raasch
38	! module interfaces removed
39	!
40	! 1092 2013-02-02 11:24:22Z raasch
41	! unused variables removed
42	!
43	! 1036 2012-10-22 13:43:42Z raasch
44	! code put under GPL (PALM 3.9)
45	!
46	! 880 2012-04-13 06:28:59Z raasch
47	! Bugfix: preprocessor statements for parallel execution added
48	!
49	! 109 2007-08-28 15:26:47Z letzel
50	! Initial revision
51	!
52	! Description:
53	! ------------
54	! Data exchange at the interface between coupled models
55	!------------------------------------------------------------------------------!
56
57	USE arrays_3d, &
58	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
59	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
60
61	USE control_parameters, &
62	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
63	humidity, humidity_remote, message_string, terminate_coupled, &
64	terminate_coupled_remote, time_since_reference_point
65
66	USE cpulog, &
67	ONLY: cpu_log, log_point
68
69	USE indices, &
70	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
71	nysg, ny_a, ny_o, nzt
72
73	USE kinds
74
75	USE pegrid
76
77	IMPLICIT NONE
78
79	REAL(wp) :: time_since_reference_point_rem !:
80	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
81
82	#if defined( __parallel )
83
84	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
85
86
87
88	!
89	!-- In case of model termination initiated by the remote model
90	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
91	!-- The rest of the coupler must then be skipped because it would cause an MPI
92	!-- intercomminucation hang.
93	!-- If necessary, the coupler will be called at the beginning of the next
94	!-- restart run.
95
96	IF ( coupling_topology == 0 ) THEN
97	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
98	0, &
99	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
100	0, comm_inter, status, ierr )
101	ELSE
102	IF ( myid == 0) THEN
103	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
104	target_id, 0, &
105	terminate_coupled_remote, 1, MPI_INTEGER, &
106	target_id, 0, &
107	comm_inter, status, ierr )
108	ENDIF
109	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
110	ierr )
111
112	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
113	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
114
115	ENDIF
116
117	IF ( terminate_coupled_remote > 0 ) THEN
118	WRITE( message_string, * ) 'remote model "', &
119	TRIM( coupling_mode_remote ), &
120	'" terminated', &
121	'&with terminate_coupled_remote = ', &
122	terminate_coupled_remote, &
123	'&local model "', TRIM( coupling_mode ), &
124	'" has', &
125	'&terminate_coupled = ', &
126	terminate_coupled
127	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
128	RETURN
129	ENDIF
130
131
132	!
133	!-- Exchange the current simulated time between the models,
134	!-- currently just for total_2ding
135	IF ( coupling_topology == 0 ) THEN
136
137	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
138	comm_inter, ierr )
139	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
140	11, comm_inter, status, ierr )
141	ELSE
142
143	IF ( myid == 0 ) THEN
144
145	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
146	11, comm_inter, ierr )
147	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
148	target_id, 11, comm_inter, status, ierr )
149
150	ENDIF
151
152	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
153	ierr )
154
155	ENDIF
156
157	!
158	!-- Exchange the interface data
159	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
160
161	!
162	!-- Horizontal grid size and number of processors is equal in ocean and
163	!-- atmosphere
164	IF ( coupling_topology == 0 ) THEN
165
166	!
167	!-- Send heat flux at bottom surface to the ocean
168	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
169	comm_inter, ierr )
170	!
171	!-- Send humidity flux at bottom surface to the ocean
172	IF ( humidity ) THEN
173	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
174	comm_inter, ierr )
175	ENDIF
176	!
177	!-- Receive temperature at the bottom surface from the ocean
178	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
179	comm_inter, status, ierr )
180	!
181	!-- Send the momentum flux (u) at bottom surface to the ocean
182	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
183	comm_inter, ierr )
184	!
185	!-- Send the momentum flux (v) at bottom surface to the ocean
186	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
187	comm_inter, ierr )
188	!
189	!-- Receive u at the bottom surface from the ocean
190	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
191	comm_inter, status, ierr )
192	!
193	!-- Receive v at the bottom surface from the ocean
194	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
195	comm_inter, status, ierr )
196	!
197	!-- Horizontal grid size or number of processors differs between
198	!-- ocean and atmosphere
199	ELSE
200
201	!
202	!-- Send heat flux at bottom surface to the ocean
203	total_2d_a = 0.0
204	total_2d = 0.0
205	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
206
207	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
208	comm2d, ierr )
209	CALL interpolate_to_ocean( 12 )
210	!
211	!-- Send humidity flux at bottom surface to the ocean
212	IF ( humidity ) THEN
213	total_2d_a = 0.0
214	total_2d = 0.0
215	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
216
217	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
218	0, comm2d, ierr )
219	CALL interpolate_to_ocean( 13 )
220	ENDIF
221	!
222	!-- Receive temperature at the bottom surface from the ocean
223	IF ( myid == 0 ) THEN
224	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
225	target_id, 14, comm_inter, status, ierr )
226	ENDIF
227	CALL MPI_BARRIER( comm2d, ierr )
228	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
229	ierr )
230	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
231	!
232	!-- Send momentum flux (u) at bottom surface to the ocean
233	total_2d_a = 0.0
234	total_2d = 0.0
235	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
236	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
237	comm2d, ierr )
238	CALL interpolate_to_ocean( 15 )
239	!
240	!-- Send momentum flux (v) at bottom surface to the ocean
241	total_2d_a = 0.0
242	total_2d = 0.0
243	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
244	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
245	comm2d, ierr )
246	CALL interpolate_to_ocean( 16 )
247	!
248	!-- Receive u at the bottom surface from the ocean
249	IF ( myid == 0 ) THEN
250	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
251	target_id, 17, comm_inter, status, ierr )
252	ENDIF
253	CALL MPI_BARRIER( comm2d, ierr )
254	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
255	ierr )
256	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
257	!
258	!-- Receive v at the bottom surface from the ocean
259	IF ( myid == 0 ) THEN
260	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
261	target_id, 18, comm_inter, status, ierr )
262	ENDIF
263	CALL MPI_BARRIER( comm2d, ierr )
264	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
265	ierr )
266	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
267
268	ENDIF
269
270	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
271
272	!
273	!-- Horizontal grid size and number of processors is equal
274	!-- in ocean and atmosphere
275	IF ( coupling_topology == 0 ) THEN
276	!
277	!-- Receive heat flux at the sea surface (top) from the atmosphere
278	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
279	comm_inter, status, ierr )
280	!
281	!-- Receive humidity flux from the atmosphere (bottom)
282	!-- and add it to the heat flux at the sea surface (top)...
283	IF ( humidity_remote ) THEN
284	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
285	target_id, 13, comm_inter, status, ierr )
286	ENDIF
287	!
288	!-- Send sea surface temperature to the atmosphere model
289	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
290	comm_inter, ierr )
291	!
292	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
293	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
294	comm_inter, status, ierr )
295	!
296	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
297	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
298	comm_inter, status, ierr )
299	!
300	!-- Send u to the atmosphere
301	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
302	comm_inter, ierr )
303	!
304	!-- Send v to the atmosphere
305	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
306	comm_inter, ierr )
307	!
308	!-- Horizontal gridsize or number of processors differs between
309	!-- ocean and atmosphere
310	ELSE
311	!
312	!-- Receive heat flux at the sea surface (top) from the atmosphere
313	IF ( myid == 0 ) THEN
314	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
315	target_id, 12, comm_inter, status, ierr )
316	ENDIF
317	CALL MPI_BARRIER( comm2d, ierr )
318	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
319	ierr )
320	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
321	!
322	!-- Receive humidity flux at the sea surface (top) from the atmosphere
323	IF ( humidity_remote ) THEN
324	IF ( myid == 0 ) THEN
325	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
326	target_id, 13, comm_inter, status, ierr )
327	ENDIF
328	CALL MPI_BARRIER( comm2d, ierr )
329	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
330	comm2d, ierr)
331	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
332	ENDIF
333	!
334	!-- Send surface temperature to atmosphere
335	total_2d_o = 0.0
336	total_2d = 0.0
337	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
338
339	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
340	comm2d, ierr)
341	CALL interpolate_to_atmos( 14 )
342	!
343	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
344	IF ( myid == 0 ) THEN
345	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
346	target_id, 15, comm_inter, status, ierr )
347	ENDIF
348	CALL MPI_BARRIER( comm2d, ierr )
349	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
350	0, comm2d, ierr )
351	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
352	!
353	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
354	IF ( myid == 0 ) THEN
355	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
356	target_id, 16, comm_inter, status, ierr )
357	ENDIF
358	CALL MPI_BARRIER( comm2d, ierr )
359	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
360	ierr )
361	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
362	!
363	!-- Send u to atmosphere
364	total_2d_o = 0.0
365	total_2d = 0.0
366	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
367	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
368	comm2d, ierr )
369	CALL interpolate_to_atmos( 17 )
370	!
371	!-- Send v to atmosphere
372	total_2d_o = 0.0
373	total_2d = 0.0
374	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
375	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
376	comm2d, ierr )
377	CALL interpolate_to_atmos( 18 )
378
379	ENDIF
380
381	!
382	!-- Conversions of fluxes received from atmosphere
383	IF ( humidity_remote ) THEN
384	!
385	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
386	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
387	!-- /(rho_atm(=1.0)*c_p)
388	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
389	!
390	!-- ...and convert it to a salinity flux at the sea surface (top)
391	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
392	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
393	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
394	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
395	ENDIF
396
397	!
398	!-- Adjust the kinematic heat flux with respect to ocean density
399	!-- (constants are the specific heat capacities for air and water)
400	!-- now tswst is the ocean top heat flux
401	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
402
403	!
404	!-- Adjust the momentum fluxes with respect to ocean density
405	uswst = uswst / rho(nzt,:,:)
406	vswst = vswst / rho(nzt,:,:)
407
408	ENDIF
409
410	IF ( coupling_topology == 1 ) THEN
411	DEALLOCATE( total_2d_o, total_2d_a )
412	ENDIF
413
414	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
415
416	#endif
417
418	END SUBROUTINE surface_coupler
419
420
421
422	SUBROUTINE interpolate_to_atmos( tag )
423
424	#if defined( __parallel )
425
426	USE arrays_3d, &
427	ONLY: total_2d_a, total_2d_o
428
429	USE indices, &
430	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
431
432	USE kinds
433
434	USE pegrid, &
435	ONLY: comm2d, comm_inter, ierr, MPI_DOUBLE_PRECISION, myid, ngp_a, &
436	target_id
437
438	IMPLICIT NONE
439
440	INTEGER(iwp) :: dnx !:
441	INTEGER(iwp) :: dnx2 !:
442	INTEGER(iwp) :: dny !:
443	INTEGER(iwp) :: dny2 !:
444	INTEGER(iwp) :: i !:
445	INTEGER(iwp) :: ii !:
446	INTEGER(iwp) :: j !:
447	INTEGER(iwp) :: jj !:
448
449	INTEGER(iwp), intent(in) :: tag !:
450
451	CALL MPI_BARRIER( comm2d, ierr )
452
453	IF ( myid == 0 ) THEN
454	!
455	!-- Cyclic boundary conditions for the total 2D-grid
456	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
457	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
458
459	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
460	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
461
462	!
463	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
464	dnx = (nx_o+1) / (nx_a+1)
465	dny = (ny_o+1) / (ny_a+1)
466
467	!
468	!-- Distance for interpolation around coarse grid points within the fine
469	!-- grid (note: 2*dnx2 must not be equal with dnx)
470	dnx2 = 2 * ( dnx / 2 )
471	dny2 = 2 * ( dny / 2 )
472
473	total_2d_a = 0.0
474	!
475	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
476	DO j = 0, ny_a
477	DO i = 0, nx_a
478	DO jj = 0, dny2
479	DO ii = 0, dnx2
480	total_2d_a(j,i) = total_2d_a(j,i) &
481	+ total_2d_o(jdny+jj,idnx+ii)
482	ENDDO
483	ENDDO
484	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
485	ENDDO
486	ENDDO
487	!
488	!-- Cyclic boundary conditions for atmosphere grid
489	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
490	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
491
492	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
493	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
494	!
495	!-- Transfer of the atmosphere-grid-layer to the atmosphere
496	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
497	tag, comm_inter, ierr )
498
499	ENDIF
500
501	CALL MPI_BARRIER( comm2d, ierr )
502
503	#endif
504
505	END SUBROUTINE interpolate_to_atmos
506
507
508	SUBROUTINE interpolate_to_ocean( tag )
509
510	#if defined( __parallel )
511
512	USE arrays_3d, &
513	ONLY: total_2d_a, total_2d_o
514
515	USE indices, &
516	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
517
518	USE kinds
519
520	USE pegrid, &
521	ONLY: comm2d, comm_inter, ierr, MPI_DOUBLE_PRECISION, myid, ngp_o, &
522	target_id
523
524	IMPLICIT NONE
525
526	INTEGER(iwp) :: dnx !:
527	INTEGER(iwp) :: dny !:
528	INTEGER(iwp) :: i !:
529	INTEGER(iwp) :: ii !:
530	INTEGER(iwp) :: j !:
531	INTEGER(iwp) :: jj !:
532	INTEGER(iwp), intent(in) :: tag !:
533
534	REAL(wp) :: fl !:
535	REAL(wp) :: fr !:
536	REAL(wp) :: myl !:
537	REAL(wp) :: myr !:
538
539	CALL MPI_BARRIER( comm2d, ierr )
540
541	IF ( myid == 0 ) THEN
542
543	!
544	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
545	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
546	dny = ( ny_o + 1 ) / ( ny_a + 1 )
547
548	!
549	!-- Cyclic boundary conditions for atmosphere grid
550	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
551	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
552
553	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
554	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
555	!
556	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
557	DO j = 0, ny
558	DO i = 0, nx
559	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
560	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
561	DO jj = 0, dny-1
562	fl = myl*jj + total_2d_a(j,i)
563	fr = myr*jj + total_2d_a(j,i+1)
564	DO ii = 0, dnx-1
565	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
566	ENDDO
567	ENDDO
568	ENDDO
569	ENDDO
570	!
571	!-- Cyclic boundary conditions for ocean grid
572	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
573	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
574
575	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
576	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
577
578	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
579	target_id, tag, comm_inter, ierr )
580
581	ENDIF
582
583	CALL MPI_BARRIER( comm2d, ierr )
584
585	#endif
586
587	END SUBROUTINE interpolate_to_ocean

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