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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1426

Last change on this file since 1426 was 1419, checked in by fricke, 10 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 1419 2014-06-06 13:09:34Z knoop $
27	!
28	! 1418 2014-06-06 13:05:08Z fricke
29	! Bugfix: For caluclation of the salinity flux at the sea surface,
30	! the given value for salinity must be in percent and not in psu
31	!
32	! 1353 2014-04-08 15:21:23Z heinze
33	! REAL constants provided with KIND-attribute
34	!
35	! 1324 2014-03-21 09:13:16Z suehring
36	! Bugfix: ONLY statement for module pegrid removed
37	!
38	! 1322 2014-03-20 16:38:49Z raasch
39	! REAL constants defined as wp-kind
40	!
41	! 1320 2014-03-20 08:40:49Z raasch
42	! ONLY-attribute added to USE-statements,
43	! kind-parameters added to all INTEGER and REAL declaration statements,
44	! kinds are defined in new module kinds,
45	! old module precision_kind is removed,
46	! revision history before 2012 removed,
47	! comment fields (!:) to be used for variable explanations added to
48	! all variable declaration statements
49	!
50	! 1318 2014-03-17 13:35:16Z raasch
51	! module interfaces removed
52	!
53	! 1092 2013-02-02 11:24:22Z raasch
54	! unused variables removed
55	!
56	! 1036 2012-10-22 13:43:42Z raasch
57	! code put under GPL (PALM 3.9)
58	!
59	! 880 2012-04-13 06:28:59Z raasch
60	! Bugfix: preprocessor statements for parallel execution added
61	!
62	! 109 2007-08-28 15:26:47Z letzel
63	! Initial revision
64	!
65	! Description:
66	! ------------
67	! Data exchange at the interface between coupled models
68	!------------------------------------------------------------------------------!
69
70	USE arrays_3d, &
71	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
72	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
73
74	USE control_parameters, &
75	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
76	humidity, humidity_remote, message_string, terminate_coupled, &
77	terminate_coupled_remote, time_since_reference_point
78
79	USE cpulog, &
80	ONLY: cpu_log, log_point
81
82	USE indices, &
83	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
84	nysg, ny_a, ny_o, nzt
85
86	USE kinds
87
88	USE pegrid
89
90	IMPLICIT NONE
91
92	REAL(wp) :: time_since_reference_point_rem !:
93	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
94
95	#if defined( __parallel )
96
97	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
98
99
100
101	!
102	!-- In case of model termination initiated by the remote model
103	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
104	!-- The rest of the coupler must then be skipped because it would cause an MPI
105	!-- intercomminucation hang.
106	!-- If necessary, the coupler will be called at the beginning of the next
107	!-- restart run.
108
109	IF ( coupling_topology == 0 ) THEN
110	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
111	0, &
112	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
113	0, comm_inter, status, ierr )
114	ELSE
115	IF ( myid == 0) THEN
116	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
117	target_id, 0, &
118	terminate_coupled_remote, 1, MPI_INTEGER, &
119	target_id, 0, &
120	comm_inter, status, ierr )
121	ENDIF
122	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
123	ierr )
124
125	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
126	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
127
128	ENDIF
129
130	IF ( terminate_coupled_remote > 0 ) THEN
131	WRITE( message_string, * ) 'remote model "', &
132	TRIM( coupling_mode_remote ), &
133	'" terminated', &
134	'&with terminate_coupled_remote = ', &
135	terminate_coupled_remote, &
136	'&local model "', TRIM( coupling_mode ), &
137	'" has', &
138	'&terminate_coupled = ', &
139	terminate_coupled
140	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
141	RETURN
142	ENDIF
143
144
145	!
146	!-- Exchange the current simulated time between the models,
147	!-- currently just for total_2ding
148	IF ( coupling_topology == 0 ) THEN
149
150	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
151	comm_inter, ierr )
152	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
153	11, comm_inter, status, ierr )
154	ELSE
155
156	IF ( myid == 0 ) THEN
157
158	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
159	11, comm_inter, ierr )
160	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
161	target_id, 11, comm_inter, status, ierr )
162
163	ENDIF
164
165	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
166	ierr )
167
168	ENDIF
169
170	!
171	!-- Exchange the interface data
172	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
173
174	!
175	!-- Horizontal grid size and number of processors is equal in ocean and
176	!-- atmosphere
177	IF ( coupling_topology == 0 ) THEN
178
179	!
180	!-- Send heat flux at bottom surface to the ocean
181	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
182	comm_inter, ierr )
183	!
184	!-- Send humidity flux at bottom surface to the ocean
185	IF ( humidity ) THEN
186	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
187	comm_inter, ierr )
188	ENDIF
189	!
190	!-- Receive temperature at the bottom surface from the ocean
191	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
192	comm_inter, status, ierr )
193	!
194	!-- Send the momentum flux (u) at bottom surface to the ocean
195	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
196	comm_inter, ierr )
197	!
198	!-- Send the momentum flux (v) at bottom surface to the ocean
199	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
200	comm_inter, ierr )
201	!
202	!-- Receive u at the bottom surface from the ocean
203	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
204	comm_inter, status, ierr )
205	!
206	!-- Receive v at the bottom surface from the ocean
207	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
208	comm_inter, status, ierr )
209	!
210	!-- Horizontal grid size or number of processors differs between
211	!-- ocean and atmosphere
212	ELSE
213
214	!
215	!-- Send heat flux at bottom surface to the ocean
216	total_2d_a = 0.0_wp
217	total_2d = 0.0_wp
218	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
219
220	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
221	comm2d, ierr )
222	CALL interpolate_to_ocean( 12 )
223	!
224	!-- Send humidity flux at bottom surface to the ocean
225	IF ( humidity ) THEN
226	total_2d_a = 0.0_wp
227	total_2d = 0.0_wp
228	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
229
230	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
231	0, comm2d, ierr )
232	CALL interpolate_to_ocean( 13 )
233	ENDIF
234	!
235	!-- Receive temperature at the bottom surface from the ocean
236	IF ( myid == 0 ) THEN
237	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
238	target_id, 14, comm_inter, status, ierr )
239	ENDIF
240	CALL MPI_BARRIER( comm2d, ierr )
241	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
242	ierr )
243	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
244	!
245	!-- Send momentum flux (u) at bottom surface to the ocean
246	total_2d_a = 0.0_wp
247	total_2d = 0.0_wp
248	total_2d(nys:nyn,nxl:nxr) = usws(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( 15 )
252	!
253	!-- Send momentum flux (v) at bottom surface to the ocean
254	total_2d_a = 0.0_wp
255	total_2d = 0.0_wp
256	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
257	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
258	comm2d, ierr )
259	CALL interpolate_to_ocean( 16 )
260	!
261	!-- Receive u 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, 17, 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	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
270	!
271	!-- Receive v at the bottom surface from the ocean
272	IF ( myid == 0 ) THEN
273	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
274	target_id, 18, comm_inter, status, ierr )
275	ENDIF
276	CALL MPI_BARRIER( comm2d, ierr )
277	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
278	ierr )
279	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
280
281	ENDIF
282
283	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
284
285	!
286	!-- Horizontal grid size and number of processors is equal
287	!-- in ocean and atmosphere
288	IF ( coupling_topology == 0 ) THEN
289	!
290	!-- Receive heat flux at the sea surface (top) from the atmosphere
291	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
292	comm_inter, status, ierr )
293	!
294	!-- Receive humidity flux from the atmosphere (bottom)
295	!-- and add it to the heat flux at the sea surface (top)...
296	IF ( humidity_remote ) THEN
297	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
298	target_id, 13, comm_inter, status, ierr )
299	ENDIF
300	!
301	!-- Send sea surface temperature to the atmosphere model
302	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
303	comm_inter, ierr )
304	!
305	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
306	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
307	comm_inter, status, ierr )
308	!
309	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
310	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
311	comm_inter, status, ierr )
312	!
313	!-- Send u to the atmosphere
314	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
315	comm_inter, ierr )
316	!
317	!-- Send v to the atmosphere
318	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
319	comm_inter, ierr )
320	!
321	!-- Horizontal gridsize or number of processors differs between
322	!-- ocean and atmosphere
323	ELSE
324	!
325	!-- Receive heat flux at the sea surface (top) from the atmosphere
326	IF ( myid == 0 ) THEN
327	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
328	target_id, 12, comm_inter, status, ierr )
329	ENDIF
330	CALL MPI_BARRIER( comm2d, ierr )
331	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
332	ierr )
333	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
334	!
335	!-- Receive humidity flux at the sea surface (top) from the atmosphere
336	IF ( humidity_remote ) THEN
337	IF ( myid == 0 ) THEN
338	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
339	target_id, 13, comm_inter, status, ierr )
340	ENDIF
341	CALL MPI_BARRIER( comm2d, ierr )
342	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
343	comm2d, ierr)
344	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
345	ENDIF
346	!
347	!-- Send surface temperature to atmosphere
348	total_2d_o = 0.0_wp
349	total_2d = 0.0_wp
350	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
351
352	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
353	comm2d, ierr)
354	CALL interpolate_to_atmos( 14 )
355	!
356	!-- Receive momentum flux (u) 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, 15, 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, &
363	0, comm2d, ierr )
364	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
365	!
366	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
367	IF ( myid == 0 ) THEN
368	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
369	target_id, 16, comm_inter, status, ierr )
370	ENDIF
371	CALL MPI_BARRIER( comm2d, ierr )
372	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
373	ierr )
374	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
375	!
376	!-- Send u to atmosphere
377	total_2d_o = 0.0_wp
378	total_2d = 0.0_wp
379	total_2d(nys:nyn,nxl:nxr) = u(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( 17 )
383	!
384	!-- Send v to atmosphere
385	total_2d_o = 0.0_wp
386	total_2d = 0.0_wp
387	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
388	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
389	comm2d, ierr )
390	CALL interpolate_to_atmos( 18 )
391
392	ENDIF
393
394	!
395	!-- Conversions of fluxes received from atmosphere
396	IF ( humidity_remote ) THEN
397	!
398	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
399	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
400	!-- /(rho_atm(=1.0)*c_p)
401	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
402	!
403	!-- ...and convert it to a salinity flux at the sea surface (top)
404	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
405	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
406	saswst = -1.0_wp * sa(nzt,:,:) * 0.001 * qswst_remote / &
407	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001 ) )
408	ENDIF
409
410	!
411	!-- Adjust the kinematic heat flux with respect to ocean density
412	!-- (constants are the specific heat capacities for air and water)
413	!-- now tswst is the ocean top heat flux
414	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
415
416	!
417	!-- Adjust the momentum fluxes with respect to ocean density
418	uswst = uswst / rho(nzt,:,:)
419	vswst = vswst / rho(nzt,:,:)
420
421	ENDIF
422
423	IF ( coupling_topology == 1 ) THEN
424	DEALLOCATE( total_2d_o, total_2d_a )
425	ENDIF
426
427	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
428
429	#endif
430
431	END SUBROUTINE surface_coupler
432
433
434
435	SUBROUTINE interpolate_to_atmos( tag )
436
437	#if defined( __parallel )
438
439	USE arrays_3d, &
440	ONLY: total_2d_a, total_2d_o
441
442	USE indices, &
443	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
444
445	USE kinds
446
447	USE pegrid
448
449	IMPLICIT NONE
450
451	INTEGER(iwp) :: dnx !:
452	INTEGER(iwp) :: dnx2 !:
453	INTEGER(iwp) :: dny !:
454	INTEGER(iwp) :: dny2 !:
455	INTEGER(iwp) :: i !:
456	INTEGER(iwp) :: ii !:
457	INTEGER(iwp) :: j !:
458	INTEGER(iwp) :: jj !:
459
460	INTEGER(iwp), intent(in) :: tag !:
461
462	CALL MPI_BARRIER( comm2d, ierr )
463
464	IF ( myid == 0 ) THEN
465	!
466	!-- Cyclic boundary conditions for the total 2D-grid
467	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
468	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
469
470	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
471	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
472
473	!
474	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
475	dnx = (nx_o+1) / (nx_a+1)
476	dny = (ny_o+1) / (ny_a+1)
477
478	!
479	!-- Distance for interpolation around coarse grid points within the fine
480	!-- grid (note: 2*dnx2 must not be equal with dnx)
481	dnx2 = 2 * ( dnx / 2 )
482	dny2 = 2 * ( dny / 2 )
483
484	total_2d_a = 0.0_wp
485	!
486	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
487	DO j = 0, ny_a
488	DO i = 0, nx_a
489	DO jj = 0, dny2
490	DO ii = 0, dnx2
491	total_2d_a(j,i) = total_2d_a(j,i) &
492	+ total_2d_o(jdny+jj,idnx+ii)
493	ENDDO
494	ENDDO
495	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
496	ENDDO
497	ENDDO
498	!
499	!-- Cyclic boundary conditions for atmosphere grid
500	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
501	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
502
503	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
504	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
505	!
506	!-- Transfer of the atmosphere-grid-layer to the atmosphere
507	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
508	tag, comm_inter, ierr )
509
510	ENDIF
511
512	CALL MPI_BARRIER( comm2d, ierr )
513
514	#endif
515
516	END SUBROUTINE interpolate_to_atmos
517
518
519	SUBROUTINE interpolate_to_ocean( tag )
520
521	#if defined( __parallel )
522
523	USE arrays_3d, &
524	ONLY: total_2d_a, total_2d_o
525
526	USE indices, &
527	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
528
529	USE kinds
530
531	USE pegrid
532
533	IMPLICIT NONE
534
535	INTEGER(iwp) :: dnx !:
536	INTEGER(iwp) :: dny !:
537	INTEGER(iwp) :: i !:
538	INTEGER(iwp) :: ii !:
539	INTEGER(iwp) :: j !:
540	INTEGER(iwp) :: jj !:
541	INTEGER(iwp), intent(in) :: tag !:
542
543	REAL(wp) :: fl !:
544	REAL(wp) :: fr !:
545	REAL(wp) :: myl !:
546	REAL(wp) :: myr !:
547
548	CALL MPI_BARRIER( comm2d, ierr )
549
550	IF ( myid == 0 ) THEN
551
552	!
553	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
554	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
555	dny = ( ny_o + 1 ) / ( ny_a + 1 )
556
557	!
558	!-- Cyclic boundary conditions for atmosphere grid
559	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
560	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
561
562	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
563	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
564	!
565	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
566	DO j = 0, ny
567	DO i = 0, nx
568	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
569	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
570	DO jj = 0, dny-1
571	fl = myl*jj + total_2d_a(j,i)
572	fr = myr*jj + total_2d_a(j,i+1)
573	DO ii = 0, dnx-1
574	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
575	ENDDO
576	ENDDO
577	ENDDO
578	ENDDO
579	!
580	!-- Cyclic boundary conditions for ocean grid
581	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
582	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
583
584	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
585	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
586
587	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
588	target_id, tag, comm_inter, ierr )
589
590	ENDIF
591
592	CALL MPI_BARRIER( comm2d, ierr )
593
594	#endif
595
596	END SUBROUTINE interpolate_to_ocean

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