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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1682

Last change on this file since 1682 was 1682, checked in by knoop, 9 years ago
Code annotations made doxygen readable
Property svn:keywords set to `Id`
File size: 22.3 KB

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1	!> @file surface_coupler.f90
2	!--------------------------------------------------------------------------------!
3	! This file is part of PALM.
4	!
5	! PALM is free software: you can redistribute it and/or modify it under the terms
6	! of the GNU General Public License as published by the Free Software Foundation,
7	! either version 3 of the License, or (at your option) any later version.
8	!
9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
12	!
13	! You should have received a copy of the GNU General Public License along with
14	! PALM. If not, see <http://www.gnu.org/licenses/>.
15	!
16	! Copyright 1997-2014 Leibniz Universitaet Hannover
17	!--------------------------------------------------------------------------------!
18	!
19	! Current revisions:
20	! ------------------
21	! Code annotations made doxygen readable
22	!
23	! Former revisions:
24	! -----------------
25	! $Id: surface_coupler.f90 1682 2015-10-07 23:56:08Z knoop $
26	!
27	! 1427 2014-07-07 14:04:59Z maronga
28	! Bugfix: value of l_v corrected.
29	!
30	! 1418 2014-06-06 13:05:08Z fricke
31	! Bugfix: For caluclation of the salinity flux at the sea surface,
32	! the given value for salinity must be in percent and not in psu
33	!
34	! 1353 2014-04-08 15:21:23Z heinze
35	! REAL constants provided with KIND-attribute
36	!
37	! 1324 2014-03-21 09:13:16Z suehring
38	! Bugfix: ONLY statement for module pegrid removed
39	!
40	! 1322 2014-03-20 16:38:49Z raasch
41	! REAL constants defined as wp-kind
42	!
43	! 1320 2014-03-20 08:40:49Z raasch
44	! ONLY-attribute added to USE-statements,
45	! kind-parameters added to all INTEGER and REAL declaration statements,
46	! kinds are defined in new module kinds,
47	! old module precision_kind is removed,
48	! revision history before 2012 removed,
49	! comment fields (!:) to be used for variable explanations added to
50	! all variable declaration statements
51	!
52	! 1318 2014-03-17 13:35:16Z raasch
53	! module interfaces removed
54	!
55	! 1092 2013-02-02 11:24:22Z raasch
56	! unused variables removed
57	!
58	! 1036 2012-10-22 13:43:42Z raasch
59	! code put under GPL (PALM 3.9)
60	!
61	! 880 2012-04-13 06:28:59Z raasch
62	! Bugfix: preprocessor statements for parallel execution added
63	!
64	! 109 2007-08-28 15:26:47Z letzel
65	! Initial revision
66	!
67	! Description:
68	! ------------
69	!> Data exchange at the interface between coupled models
70	!------------------------------------------------------------------------------!
71	SUBROUTINE surface_coupler
72
73
74	USE arrays_3d, &
75	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
76	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
77
78	USE cloud_parameters, &
79	ONLY: cp, l_v
80
81	USE control_parameters, &
82	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
83	humidity, humidity_remote, message_string, terminate_coupled, &
84	terminate_coupled_remote, time_since_reference_point
85
86	USE cpulog, &
87	ONLY: cpu_log, log_point
88
89	USE indices, &
90	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
91	nysg, ny_a, ny_o, nzt
92
93	USE kinds
94
95	USE pegrid
96
97	IMPLICIT NONE
98
99	REAL(wp) :: time_since_reference_point_rem !<
100	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
101
102	REAL(wp) :: cpw = 4218.0_wp !< heat capacity of water at constant pressure
103
104	#if defined( __parallel )
105
106	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
107
108
109
110	!
111	!-- In case of model termination initiated by the remote model
112	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
113	!-- The rest of the coupler must then be skipped because it would cause an MPI
114	!-- intercomminucation hang.
115	!-- If necessary, the coupler will be called at the beginning of the next
116	!-- restart run.
117
118	IF ( coupling_topology == 0 ) THEN
119	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
120	0, &
121	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
122	0, comm_inter, status, ierr )
123	ELSE
124	IF ( myid == 0) THEN
125	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
126	target_id, 0, &
127	terminate_coupled_remote, 1, MPI_INTEGER, &
128	target_id, 0, &
129	comm_inter, status, ierr )
130	ENDIF
131	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
132	ierr )
133
134	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
135	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
136
137	ENDIF
138
139	IF ( terminate_coupled_remote > 0 ) THEN
140	WRITE( message_string, * ) 'remote model "', &
141	TRIM( coupling_mode_remote ), &
142	'" terminated', &
143	'&with terminate_coupled_remote = ', &
144	terminate_coupled_remote, &
145	'&local model "', TRIM( coupling_mode ), &
146	'" has', &
147	'&terminate_coupled = ', &
148	terminate_coupled
149	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
150	RETURN
151	ENDIF
152
153
154	!
155	!-- Exchange the current simulated time between the models,
156	!-- currently just for total_2ding
157	IF ( coupling_topology == 0 ) THEN
158
159	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
160	comm_inter, ierr )
161	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
162	11, comm_inter, status, ierr )
163	ELSE
164
165	IF ( myid == 0 ) THEN
166
167	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
168	11, comm_inter, ierr )
169	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
170	target_id, 11, comm_inter, status, ierr )
171
172	ENDIF
173
174	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
175	ierr )
176
177	ENDIF
178
179	!
180	!-- Exchange the interface data
181	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
182
183	!
184	!-- Horizontal grid size and number of processors is equal in ocean and
185	!-- atmosphere
186	IF ( coupling_topology == 0 ) THEN
187
188	!
189	!-- Send heat flux at bottom surface to the ocean
190	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
191	comm_inter, ierr )
192	!
193	!-- Send humidity flux at bottom surface to the ocean
194	IF ( humidity ) THEN
195	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
196	comm_inter, ierr )
197	ENDIF
198	!
199	!-- Receive temperature at the bottom surface from the ocean
200	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
201	comm_inter, status, ierr )
202	!
203	!-- Send the momentum flux (u) at bottom surface to the ocean
204	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
205	comm_inter, ierr )
206	!
207	!-- Send the momentum flux (v) at bottom surface to the ocean
208	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
209	comm_inter, ierr )
210	!
211	!-- Receive u at the bottom surface from the ocean
212	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
213	comm_inter, status, ierr )
214	!
215	!-- Receive v at the bottom surface from the ocean
216	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
217	comm_inter, status, ierr )
218	!
219	!-- Horizontal grid size or number of processors differs between
220	!-- ocean and atmosphere
221	ELSE
222
223	!
224	!-- Send heat flux at bottom surface to the ocean
225	total_2d_a = 0.0_wp
226	total_2d = 0.0_wp
227	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
228
229	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
230	comm2d, ierr )
231	CALL interpolate_to_ocean( 12 )
232	!
233	!-- Send humidity flux at bottom surface to the ocean
234	IF ( humidity ) THEN
235	total_2d_a = 0.0_wp
236	total_2d = 0.0_wp
237	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
238
239	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
240	0, comm2d, ierr )
241	CALL interpolate_to_ocean( 13 )
242	ENDIF
243	!
244	!-- Receive temperature at the bottom surface from the ocean
245	IF ( myid == 0 ) THEN
246	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
247	target_id, 14, comm_inter, status, ierr )
248	ENDIF
249	CALL MPI_BARRIER( comm2d, ierr )
250	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
251	ierr )
252	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
253	!
254	!-- Send momentum flux (u) at bottom surface to the ocean
255	total_2d_a = 0.0_wp
256	total_2d = 0.0_wp
257	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
258	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
259	comm2d, ierr )
260	CALL interpolate_to_ocean( 15 )
261	!
262	!-- Send momentum flux (v) at bottom surface to the ocean
263	total_2d_a = 0.0_wp
264	total_2d = 0.0_wp
265	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
266	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
267	comm2d, ierr )
268	CALL interpolate_to_ocean( 16 )
269	!
270	!-- Receive u at the bottom surface from the ocean
271	IF ( myid == 0 ) THEN
272	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
273	target_id, 17, comm_inter, status, ierr )
274	ENDIF
275	CALL MPI_BARRIER( comm2d, ierr )
276	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
277	ierr )
278	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
279	!
280	!-- Receive v at the bottom surface from the ocean
281	IF ( myid == 0 ) THEN
282	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
283	target_id, 18, comm_inter, status, ierr )
284	ENDIF
285	CALL MPI_BARRIER( comm2d, ierr )
286	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
287	ierr )
288	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
289
290	ENDIF
291
292	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
293
294	!
295	!-- Horizontal grid size and number of processors is equal
296	!-- in ocean and atmosphere
297	IF ( coupling_topology == 0 ) THEN
298	!
299	!-- Receive heat flux at the sea surface (top) from the atmosphere
300	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
301	comm_inter, status, ierr )
302	!
303	!-- Receive humidity flux from the atmosphere (bottom)
304	!-- and add it to the heat flux at the sea surface (top)...
305	IF ( humidity_remote ) THEN
306	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
307	target_id, 13, comm_inter, status, ierr )
308	ENDIF
309	!
310	!-- Send sea surface temperature to the atmosphere model
311	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
312	comm_inter, ierr )
313	!
314	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
315	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
316	comm_inter, status, ierr )
317	!
318	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
319	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
320	comm_inter, status, ierr )
321	!
322	!-- Send u to the atmosphere
323	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
324	comm_inter, ierr )
325	!
326	!-- Send v to the atmosphere
327	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
328	comm_inter, ierr )
329	!
330	!-- Horizontal gridsize or number of processors differs between
331	!-- ocean and atmosphere
332	ELSE
333	!
334	!-- Receive heat flux at the sea surface (top) from the atmosphere
335	IF ( myid == 0 ) THEN
336	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
337	target_id, 12, comm_inter, status, ierr )
338	ENDIF
339	CALL MPI_BARRIER( comm2d, ierr )
340	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
341	ierr )
342	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
343	!
344	!-- Receive humidity flux at the sea surface (top) from the atmosphere
345	IF ( humidity_remote ) THEN
346	IF ( myid == 0 ) THEN
347	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
348	target_id, 13, comm_inter, status, ierr )
349	ENDIF
350	CALL MPI_BARRIER( comm2d, ierr )
351	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
352	comm2d, ierr)
353	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
354	ENDIF
355	!
356	!-- Send surface temperature to atmosphere
357	total_2d_o = 0.0_wp
358	total_2d = 0.0_wp
359	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
360
361	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
362	comm2d, ierr)
363	CALL interpolate_to_atmos( 14 )
364	!
365	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
366	IF ( myid == 0 ) THEN
367	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
368	target_id, 15, comm_inter, status, ierr )
369	ENDIF
370	CALL MPI_BARRIER( comm2d, ierr )
371	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
372	0, comm2d, ierr )
373	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
374	!
375	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
376	IF ( myid == 0 ) THEN
377	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
378	target_id, 16, comm_inter, status, ierr )
379	ENDIF
380	CALL MPI_BARRIER( comm2d, ierr )
381	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
382	ierr )
383	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
384	!
385	!-- Send u to atmosphere
386	total_2d_o = 0.0_wp
387	total_2d = 0.0_wp
388	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
389	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
390	comm2d, ierr )
391	CALL interpolate_to_atmos( 17 )
392	!
393	!-- Send v to atmosphere
394	total_2d_o = 0.0_wp
395	total_2d = 0.0_wp
396	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
397	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
398	comm2d, ierr )
399	CALL interpolate_to_atmos( 18 )
400
401	ENDIF
402
403	!
404	!-- Conversions of fluxes received from atmosphere
405	IF ( humidity_remote ) THEN
406	!
407	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
408	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
409	!-- /(rho_atm(=1.0)*c_p)
410	tswst = tswst + qswst_remote * l_v / cp
411	!
412	!-- ...and convert it to a salinity flux at the sea surface (top)
413	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
414	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
415	saswst = -1.0_wp * sa(nzt,:,:) * 0.001_wp * qswst_remote / &
416	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001_wp ) )
417	ENDIF
418
419	!
420	!-- Adjust the kinematic heat flux with respect to ocean density
421	!-- (constants are the specific heat capacities for air and water)
422	!-- now tswst is the ocean top heat flux
423	tswst = tswst / rho(nzt,:,:) * cp / cpw
424
425	!
426	!-- Adjust the momentum fluxes with respect to ocean density
427	uswst = uswst / rho(nzt,:,:)
428	vswst = vswst / rho(nzt,:,:)
429
430	ENDIF
431
432	IF ( coupling_topology == 1 ) THEN
433	DEALLOCATE( total_2d_o, total_2d_a )
434	ENDIF
435
436	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
437
438	#endif
439
440	END SUBROUTINE surface_coupler
441
442
443
444	!------------------------------------------------------------------------------!
445	! Description:
446	! ------------
447	!> @todo Missing subroutine description.
448	!------------------------------------------------------------------------------!
449	SUBROUTINE interpolate_to_atmos( tag )
450
451	#if defined( __parallel )
452
453	USE arrays_3d, &
454	ONLY: total_2d_a, total_2d_o
455
456	USE indices, &
457	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
458
459	USE kinds
460
461	USE pegrid
462
463	IMPLICIT NONE
464
465	INTEGER(iwp) :: dnx !<
466	INTEGER(iwp) :: dnx2 !<
467	INTEGER(iwp) :: dny !<
468	INTEGER(iwp) :: dny2 !<
469	INTEGER(iwp) :: i !<
470	INTEGER(iwp) :: ii !<
471	INTEGER(iwp) :: j !<
472	INTEGER(iwp) :: jj !<
473
474	INTEGER(iwp), intent(in) :: tag !<
475
476	CALL MPI_BARRIER( comm2d, ierr )
477
478	IF ( myid == 0 ) THEN
479	!
480	!-- Cyclic boundary conditions for the total 2D-grid
481	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
482	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
483
484	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
485	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
486
487	!
488	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
489	dnx = (nx_o+1) / (nx_a+1)
490	dny = (ny_o+1) / (ny_a+1)
491
492	!
493	!-- Distance for interpolation around coarse grid points within the fine
494	!-- grid (note: 2*dnx2 must not be equal with dnx)
495	dnx2 = 2 * ( dnx / 2 )
496	dny2 = 2 * ( dny / 2 )
497
498	total_2d_a = 0.0_wp
499	!
500	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
501	DO j = 0, ny_a
502	DO i = 0, nx_a
503	DO jj = 0, dny2
504	DO ii = 0, dnx2
505	total_2d_a(j,i) = total_2d_a(j,i) &
506	+ total_2d_o(jdny+jj,idnx+ii)
507	ENDDO
508	ENDDO
509	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
510	ENDDO
511	ENDDO
512	!
513	!-- Cyclic boundary conditions for atmosphere grid
514	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
515	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
516
517	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
518	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
519	!
520	!-- Transfer of the atmosphere-grid-layer to the atmosphere
521	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
522	tag, comm_inter, ierr )
523
524	ENDIF
525
526	CALL MPI_BARRIER( comm2d, ierr )
527
528	#endif
529
530	END SUBROUTINE interpolate_to_atmos
531
532
533	!------------------------------------------------------------------------------!
534	! Description:
535	! ------------
536	!> @todo Missing subroutine description.
537	!------------------------------------------------------------------------------!
538	SUBROUTINE interpolate_to_ocean( tag )
539
540	#if defined( __parallel )
541
542	USE arrays_3d, &
543	ONLY: total_2d_a, total_2d_o
544
545	USE indices, &
546	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
547
548	USE kinds
549
550	USE pegrid
551
552	IMPLICIT NONE
553
554	INTEGER(iwp) :: dnx !<
555	INTEGER(iwp) :: dny !<
556	INTEGER(iwp) :: i !<
557	INTEGER(iwp) :: ii !<
558	INTEGER(iwp) :: j !<
559	INTEGER(iwp) :: jj !<
560	INTEGER(iwp), intent(in) :: tag !<
561
562	REAL(wp) :: fl !<
563	REAL(wp) :: fr !<
564	REAL(wp) :: myl !<
565	REAL(wp) :: myr !<
566
567	CALL MPI_BARRIER( comm2d, ierr )
568
569	IF ( myid == 0 ) THEN
570
571	!
572	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
573	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
574	dny = ( ny_o + 1 ) / ( ny_a + 1 )
575
576	!
577	!-- Cyclic boundary conditions for atmosphere grid
578	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
579	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
580
581	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
582	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
583	!
584	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
585	DO j = 0, ny
586	DO i = 0, nx
587	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
588	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
589	DO jj = 0, dny-1
590	fl = myl*jj + total_2d_a(j,i)
591	fr = myr*jj + total_2d_a(j,i+1)
592	DO ii = 0, dnx-1
593	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
594	ENDDO
595	ENDDO
596	ENDDO
597	ENDDO
598	!
599	!-- Cyclic boundary conditions for ocean grid
600	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
601	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
602
603	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
604	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
605
606	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
607	target_id, tag, comm_inter, ierr )
608
609	ENDIF
610
611	CALL MPI_BARRIER( comm2d, ierr )
612
613	#endif
614
615	END SUBROUTINE interpolate_to_ocean

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