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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1517

Last change on this file since 1517 was 1428, checked in by maronga, 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 1428 2014-07-07 14:06:05Z hoffmann $
27	!
28	! 1427 2014-07-07 14:04:59Z maronga
29	! Bugfix: value of l_v corrected.
30	!
31	! 1418 2014-06-06 13:05:08Z fricke
32	! Bugfix: For caluclation of the salinity flux at the sea surface,
33	! the given value for salinity must be in percent and not in psu
34	!
35	! 1353 2014-04-08 15:21:23Z heinze
36	! REAL constants provided with KIND-attribute
37	!
38	! 1324 2014-03-21 09:13:16Z suehring
39	! Bugfix: ONLY statement for module pegrid removed
40	!
41	! 1322 2014-03-20 16:38:49Z raasch
42	! REAL constants defined as wp-kind
43	!
44	! 1320 2014-03-20 08:40:49Z raasch
45	! ONLY-attribute added to USE-statements,
46	! kind-parameters added to all INTEGER and REAL declaration statements,
47	! kinds are defined in new module kinds,
48	! old module precision_kind is removed,
49	! revision history before 2012 removed,
50	! comment fields (!:) to be used for variable explanations added to
51	! all variable declaration statements
52	!
53	! 1318 2014-03-17 13:35:16Z raasch
54	! module interfaces removed
55	!
56	! 1092 2013-02-02 11:24:22Z raasch
57	! unused variables removed
58	!
59	! 1036 2012-10-22 13:43:42Z raasch
60	! code put under GPL (PALM 3.9)
61	!
62	! 880 2012-04-13 06:28:59Z raasch
63	! Bugfix: preprocessor statements for parallel execution added
64	!
65	! 109 2007-08-28 15:26:47Z letzel
66	! Initial revision
67	!
68	! Description:
69	! ------------
70	! Data exchange at the interface between coupled models
71	!------------------------------------------------------------------------------!
72
73	USE arrays_3d, &
74	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
75	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
76
77	USE cloud_parameters, &
78	ONLY: cp, l_v
79
80	USE control_parameters, &
81	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
82	humidity, humidity_remote, message_string, terminate_coupled, &
83	terminate_coupled_remote, time_since_reference_point
84
85	USE cpulog, &
86	ONLY: cpu_log, log_point
87
88	USE indices, &
89	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
90	nysg, ny_a, ny_o, nzt
91
92	USE kinds
93
94	USE pegrid
95
96	IMPLICIT NONE
97
98	REAL(wp) :: time_since_reference_point_rem !:
99	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
100
101	REAL(wp) :: cpw = 4218.0_wp !: heat capacity of water at constant pressure
102
103	#if defined( __parallel )
104
105	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
106
107
108
109	!
110	!-- In case of model termination initiated by the remote model
111	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
112	!-- The rest of the coupler must then be skipped because it would cause an MPI
113	!-- intercomminucation hang.
114	!-- If necessary, the coupler will be called at the beginning of the next
115	!-- restart run.
116
117	IF ( coupling_topology == 0 ) THEN
118	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
119	0, &
120	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
121	0, comm_inter, status, ierr )
122	ELSE
123	IF ( myid == 0) THEN
124	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
125	target_id, 0, &
126	terminate_coupled_remote, 1, MPI_INTEGER, &
127	target_id, 0, &
128	comm_inter, status, ierr )
129	ENDIF
130	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
131	ierr )
132
133	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
134	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
135
136	ENDIF
137
138	IF ( terminate_coupled_remote > 0 ) THEN
139	WRITE( message_string, * ) 'remote model "', &
140	TRIM( coupling_mode_remote ), &
141	'" terminated', &
142	'&with terminate_coupled_remote = ', &
143	terminate_coupled_remote, &
144	'&local model "', TRIM( coupling_mode ), &
145	'" has', &
146	'&terminate_coupled = ', &
147	terminate_coupled
148	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
149	RETURN
150	ENDIF
151
152
153	!
154	!-- Exchange the current simulated time between the models,
155	!-- currently just for total_2ding
156	IF ( coupling_topology == 0 ) THEN
157
158	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
159	comm_inter, ierr )
160	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
161	11, comm_inter, status, ierr )
162	ELSE
163
164	IF ( myid == 0 ) THEN
165
166	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
167	11, comm_inter, ierr )
168	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
169	target_id, 11, comm_inter, status, ierr )
170
171	ENDIF
172
173	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
174	ierr )
175
176	ENDIF
177
178	!
179	!-- Exchange the interface data
180	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
181
182	!
183	!-- Horizontal grid size and number of processors is equal in ocean and
184	!-- atmosphere
185	IF ( coupling_topology == 0 ) THEN
186
187	!
188	!-- Send heat flux at bottom surface to the ocean
189	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
190	comm_inter, ierr )
191	!
192	!-- Send humidity flux at bottom surface to the ocean
193	IF ( humidity ) THEN
194	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
195	comm_inter, ierr )
196	ENDIF
197	!
198	!-- Receive temperature at the bottom surface from the ocean
199	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
200	comm_inter, status, ierr )
201	!
202	!-- Send the momentum flux (u) at bottom surface to the ocean
203	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
204	comm_inter, ierr )
205	!
206	!-- Send the momentum flux (v) at bottom surface to the ocean
207	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
208	comm_inter, ierr )
209	!
210	!-- Receive u at the bottom surface from the ocean
211	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
212	comm_inter, status, ierr )
213	!
214	!-- Receive v at the bottom surface from the ocean
215	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
216	comm_inter, status, ierr )
217	!
218	!-- Horizontal grid size or number of processors differs between
219	!-- ocean and atmosphere
220	ELSE
221
222	!
223	!-- Send heat flux at bottom surface to the ocean
224	total_2d_a = 0.0_wp
225	total_2d = 0.0_wp
226	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
227
228	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
229	comm2d, ierr )
230	CALL interpolate_to_ocean( 12 )
231	!
232	!-- Send humidity flux at bottom surface to the ocean
233	IF ( humidity ) THEN
234	total_2d_a = 0.0_wp
235	total_2d = 0.0_wp
236	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
237
238	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
239	0, comm2d, ierr )
240	CALL interpolate_to_ocean( 13 )
241	ENDIF
242	!
243	!-- Receive temperature at the bottom surface from the ocean
244	IF ( myid == 0 ) THEN
245	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
246	target_id, 14, comm_inter, status, ierr )
247	ENDIF
248	CALL MPI_BARRIER( comm2d, ierr )
249	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
250	ierr )
251	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
252	!
253	!-- Send momentum flux (u) 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) = usws(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( 15 )
260	!
261	!-- Send momentum flux (v) at bottom surface to the ocean
262	total_2d_a = 0.0_wp
263	total_2d = 0.0_wp
264	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
265	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
266	comm2d, ierr )
267	CALL interpolate_to_ocean( 16 )
268	!
269	!-- Receive u at the bottom surface from the ocean
270	IF ( myid == 0 ) THEN
271	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
272	target_id, 17, comm_inter, status, ierr )
273	ENDIF
274	CALL MPI_BARRIER( comm2d, ierr )
275	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
276	ierr )
277	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
278	!
279	!-- Receive v at the bottom surface from the ocean
280	IF ( myid == 0 ) THEN
281	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
282	target_id, 18, comm_inter, status, ierr )
283	ENDIF
284	CALL MPI_BARRIER( comm2d, ierr )
285	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
286	ierr )
287	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
288
289	ENDIF
290
291	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
292
293	!
294	!-- Horizontal grid size and number of processors is equal
295	!-- in ocean and atmosphere
296	IF ( coupling_topology == 0 ) THEN
297	!
298	!-- Receive heat flux at the sea surface (top) from the atmosphere
299	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
300	comm_inter, status, ierr )
301	!
302	!-- Receive humidity flux from the atmosphere (bottom)
303	!-- and add it to the heat flux at the sea surface (top)...
304	IF ( humidity_remote ) THEN
305	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
306	target_id, 13, comm_inter, status, ierr )
307	ENDIF
308	!
309	!-- Send sea surface temperature to the atmosphere model
310	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
311	comm_inter, ierr )
312	!
313	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
314	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
315	comm_inter, status, ierr )
316	!
317	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
318	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
319	comm_inter, status, ierr )
320	!
321	!-- Send u to the atmosphere
322	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
323	comm_inter, ierr )
324	!
325	!-- Send v to the atmosphere
326	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
327	comm_inter, ierr )
328	!
329	!-- Horizontal gridsize or number of processors differs between
330	!-- ocean and atmosphere
331	ELSE
332	!
333	!-- Receive heat flux at the sea surface (top) from the atmosphere
334	IF ( myid == 0 ) THEN
335	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
336	target_id, 12, comm_inter, status, ierr )
337	ENDIF
338	CALL MPI_BARRIER( comm2d, ierr )
339	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
340	ierr )
341	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
342	!
343	!-- Receive humidity flux at the sea surface (top) from the atmosphere
344	IF ( humidity_remote ) THEN
345	IF ( myid == 0 ) THEN
346	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
347	target_id, 13, comm_inter, status, ierr )
348	ENDIF
349	CALL MPI_BARRIER( comm2d, ierr )
350	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
351	comm2d, ierr)
352	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
353	ENDIF
354	!
355	!-- Send surface temperature to atmosphere
356	total_2d_o = 0.0_wp
357	total_2d = 0.0_wp
358	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
359
360	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
361	comm2d, ierr)
362	CALL interpolate_to_atmos( 14 )
363	!
364	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
365	IF ( myid == 0 ) THEN
366	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
367	target_id, 15, comm_inter, status, ierr )
368	ENDIF
369	CALL MPI_BARRIER( comm2d, ierr )
370	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
371	0, comm2d, ierr )
372	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
373	!
374	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
375	IF ( myid == 0 ) THEN
376	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
377	target_id, 16, comm_inter, status, ierr )
378	ENDIF
379	CALL MPI_BARRIER( comm2d, ierr )
380	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
381	ierr )
382	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
383	!
384	!-- Send u to atmosphere
385	total_2d_o = 0.0_wp
386	total_2d = 0.0_wp
387	total_2d(nys:nyn,nxl:nxr) = u(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( 17 )
391	!
392	!-- Send v to atmosphere
393	total_2d_o = 0.0_wp
394	total_2d = 0.0_wp
395	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
396	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
397	comm2d, ierr )
398	CALL interpolate_to_atmos( 18 )
399
400	ENDIF
401
402	!
403	!-- Conversions of fluxes received from atmosphere
404	IF ( humidity_remote ) THEN
405	!
406	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
407	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
408	!-- /(rho_atm(=1.0)*c_p)
409	tswst = tswst + qswst_remote * l_v / cp
410	!
411	!-- ...and convert it to a salinity flux at the sea surface (top)
412	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
413	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
414	saswst = -1.0_wp * sa(nzt,:,:) * 0.001_wp * qswst_remote / &
415	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001_wp ) )
416	ENDIF
417
418	!
419	!-- Adjust the kinematic heat flux with respect to ocean density
420	!-- (constants are the specific heat capacities for air and water)
421	!-- now tswst is the ocean top heat flux
422	tswst = tswst / rho(nzt,:,:) * cp / cpw
423
424	!
425	!-- Adjust the momentum fluxes with respect to ocean density
426	uswst = uswst / rho(nzt,:,:)
427	vswst = vswst / rho(nzt,:,:)
428
429	ENDIF
430
431	IF ( coupling_topology == 1 ) THEN
432	DEALLOCATE( total_2d_o, total_2d_a )
433	ENDIF
434
435	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
436
437	#endif
438
439	END SUBROUTINE surface_coupler
440
441
442
443	SUBROUTINE interpolate_to_atmos( tag )
444
445	#if defined( __parallel )
446
447	USE arrays_3d, &
448	ONLY: total_2d_a, total_2d_o
449
450	USE indices, &
451	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
452
453	USE kinds
454
455	USE pegrid
456
457	IMPLICIT NONE
458
459	INTEGER(iwp) :: dnx !:
460	INTEGER(iwp) :: dnx2 !:
461	INTEGER(iwp) :: dny !:
462	INTEGER(iwp) :: dny2 !:
463	INTEGER(iwp) :: i !:
464	INTEGER(iwp) :: ii !:
465	INTEGER(iwp) :: j !:
466	INTEGER(iwp) :: jj !:
467
468	INTEGER(iwp), intent(in) :: tag !:
469
470	CALL MPI_BARRIER( comm2d, ierr )
471
472	IF ( myid == 0 ) THEN
473	!
474	!-- Cyclic boundary conditions for the total 2D-grid
475	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
476	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
477
478	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
479	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
480
481	!
482	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
483	dnx = (nx_o+1) / (nx_a+1)
484	dny = (ny_o+1) / (ny_a+1)
485
486	!
487	!-- Distance for interpolation around coarse grid points within the fine
488	!-- grid (note: 2*dnx2 must not be equal with dnx)
489	dnx2 = 2 * ( dnx / 2 )
490	dny2 = 2 * ( dny / 2 )
491
492	total_2d_a = 0.0_wp
493	!
494	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
495	DO j = 0, ny_a
496	DO i = 0, nx_a
497	DO jj = 0, dny2
498	DO ii = 0, dnx2
499	total_2d_a(j,i) = total_2d_a(j,i) &
500	+ total_2d_o(jdny+jj,idnx+ii)
501	ENDDO
502	ENDDO
503	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
504	ENDDO
505	ENDDO
506	!
507	!-- Cyclic boundary conditions for atmosphere grid
508	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
509	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
510
511	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
512	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
513	!
514	!-- Transfer of the atmosphere-grid-layer to the atmosphere
515	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
516	tag, comm_inter, ierr )
517
518	ENDIF
519
520	CALL MPI_BARRIER( comm2d, ierr )
521
522	#endif
523
524	END SUBROUTINE interpolate_to_atmos
525
526
527	SUBROUTINE interpolate_to_ocean( tag )
528
529	#if defined( __parallel )
530
531	USE arrays_3d, &
532	ONLY: total_2d_a, total_2d_o
533
534	USE indices, &
535	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
536
537	USE kinds
538
539	USE pegrid
540
541	IMPLICIT NONE
542
543	INTEGER(iwp) :: dnx !:
544	INTEGER(iwp) :: dny !:
545	INTEGER(iwp) :: i !:
546	INTEGER(iwp) :: ii !:
547	INTEGER(iwp) :: j !:
548	INTEGER(iwp) :: jj !:
549	INTEGER(iwp), intent(in) :: tag !:
550
551	REAL(wp) :: fl !:
552	REAL(wp) :: fr !:
553	REAL(wp) :: myl !:
554	REAL(wp) :: myr !:
555
556	CALL MPI_BARRIER( comm2d, ierr )
557
558	IF ( myid == 0 ) THEN
559
560	!
561	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
562	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
563	dny = ( ny_o + 1 ) / ( ny_a + 1 )
564
565	!
566	!-- Cyclic boundary conditions for atmosphere grid
567	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
568	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
569
570	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
571	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
572	!
573	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
574	DO j = 0, ny
575	DO i = 0, nx
576	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
577	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
578	DO jj = 0, dny-1
579	fl = myl*jj + total_2d_a(j,i)
580	fr = myr*jj + total_2d_a(j,i+1)
581	DO ii = 0, dnx-1
582	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
583	ENDDO
584	ENDDO
585	ENDDO
586	ENDDO
587	!
588	!-- Cyclic boundary conditions for ocean grid
589	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
590	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
591
592	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
593	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
594
595	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
596	target_id, tag, comm_inter, ierr )
597
598	ENDIF
599
600	CALL MPI_BARRIER( comm2d, ierr )
601
602	#endif
603
604	END SUBROUTINE interpolate_to_ocean

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