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source: palm/trunk/SOURCE/surface_coupler.f90 @ 2076

Last change on this file since 2076 was 2032, checked in by knoop, 8 years ago
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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
6	! terms of the GNU General Public License as published by the Free Software
7	! Foundation, either version 3 of the License, or (at your option) any later
8	! 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 1997-2016 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 2032 2016-10-21 15:13:51Z raasch $
27	!
28	! 2031 2016-10-21 15:11:58Z knoop
29	! renamed variable rho to rho_ocean
30	!
31	! 2000 2016-08-20 18:09:15Z knoop
32	! Forced header and separation lines into 80 columns
33	!
34	! 1682 2015-10-07 23:56:08Z knoop
35	! Code annotations made doxygen readable
36	!
37	! 1427 2014-07-07 14:04:59Z maronga
38	! Bugfix: value of l_v corrected.
39	!
40	! 1418 2014-06-06 13:05:08Z fricke
41	! Bugfix: For caluclation of the salinity flux at the sea surface,
42	! the given value for salinity must be in percent and not in psu
43	!
44	! 1353 2014-04-08 15:21:23Z heinze
45	! REAL constants provided with KIND-attribute
46	!
47	! 1324 2014-03-21 09:13:16Z suehring
48	! Bugfix: ONLY statement for module pegrid removed
49	!
50	! 1322 2014-03-20 16:38:49Z raasch
51	! REAL constants defined as wp-kind
52	!
53	! 1320 2014-03-20 08:40:49Z raasch
54	! ONLY-attribute added to USE-statements,
55	! kind-parameters added to all INTEGER and REAL declaration statements,
56	! kinds are defined in new module kinds,
57	! old module precision_kind is removed,
58	! revision history before 2012 removed,
59	! comment fields (!:) to be used for variable explanations added to
60	! all variable declaration statements
61	!
62	! 1318 2014-03-17 13:35:16Z raasch
63	! module interfaces removed
64	!
65	! 1092 2013-02-02 11:24:22Z raasch
66	! unused variables removed
67	!
68	! 1036 2012-10-22 13:43:42Z raasch
69	! code put under GPL (PALM 3.9)
70	!
71	! 880 2012-04-13 06:28:59Z raasch
72	! Bugfix: preprocessor statements for parallel execution added
73	!
74	! 109 2007-08-28 15:26:47Z letzel
75	! Initial revision
76	!
77	! Description:
78	! ------------
79	!> Data exchange at the interface between coupled models
80	!------------------------------------------------------------------------------!
81	SUBROUTINE surface_coupler
82
83
84	USE arrays_3d, &
85	ONLY: pt, shf, qsws, qswst_remote, rho_ocean, sa, saswst, total_2d_a, &
86	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
87
88	USE cloud_parameters, &
89	ONLY: cp, l_v
90
91	USE control_parameters, &
92	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
93	humidity, humidity_remote, message_string, terminate_coupled, &
94	terminate_coupled_remote, time_since_reference_point
95
96	USE cpulog, &
97	ONLY: cpu_log, log_point
98
99	USE indices, &
100	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
101	nysg, ny_a, ny_o, nzt
102
103	USE kinds
104
105	USE pegrid
106
107	IMPLICIT NONE
108
109	REAL(wp) :: time_since_reference_point_rem !<
110	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
111
112	REAL(wp) :: cpw = 4218.0_wp !< heat capacity of water at constant pressure
113
114	#if defined( __parallel )
115
116	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
117
118
119
120	!
121	!-- In case of model termination initiated by the remote model
122	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
123	!-- The rest of the coupler must then be skipped because it would cause an MPI
124	!-- intercomminucation hang.
125	!-- If necessary, the coupler will be called at the beginning of the next
126	!-- restart run.
127
128	IF ( coupling_topology == 0 ) THEN
129	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
130	0, &
131	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
132	0, comm_inter, status, ierr )
133	ELSE
134	IF ( myid == 0) THEN
135	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
136	target_id, 0, &
137	terminate_coupled_remote, 1, MPI_INTEGER, &
138	target_id, 0, &
139	comm_inter, status, ierr )
140	ENDIF
141	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
142	ierr )
143
144	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
145	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
146
147	ENDIF
148
149	IF ( terminate_coupled_remote > 0 ) THEN
150	WRITE( message_string, * ) 'remote model "', &
151	TRIM( coupling_mode_remote ), &
152	'" terminated', &
153	'&with terminate_coupled_remote = ', &
154	terminate_coupled_remote, &
155	'&local model "', TRIM( coupling_mode ), &
156	'" has', &
157	'&terminate_coupled = ', &
158	terminate_coupled
159	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
160	RETURN
161	ENDIF
162
163
164	!
165	!-- Exchange the current simulated time between the models,
166	!-- currently just for total_2ding
167	IF ( coupling_topology == 0 ) THEN
168
169	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
170	comm_inter, ierr )
171	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
172	11, comm_inter, status, ierr )
173	ELSE
174
175	IF ( myid == 0 ) THEN
176
177	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
178	11, comm_inter, ierr )
179	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
180	target_id, 11, comm_inter, status, ierr )
181
182	ENDIF
183
184	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
185	ierr )
186
187	ENDIF
188
189	!
190	!-- Exchange the interface data
191	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
192
193	!
194	!-- Horizontal grid size and number of processors is equal in ocean and
195	!-- atmosphere
196	IF ( coupling_topology == 0 ) THEN
197
198	!
199	!-- Send heat flux at bottom surface to the ocean
200	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
201	comm_inter, ierr )
202	!
203	!-- Send humidity flux at bottom surface to the ocean
204	IF ( humidity ) THEN
205	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
206	comm_inter, ierr )
207	ENDIF
208	!
209	!-- Receive temperature at the bottom surface from the ocean
210	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
211	comm_inter, status, ierr )
212	!
213	!-- Send the momentum flux (u) at bottom surface to the ocean
214	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
215	comm_inter, ierr )
216	!
217	!-- Send the momentum flux (v) at bottom surface to the ocean
218	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
219	comm_inter, ierr )
220	!
221	!-- Receive u at the bottom surface from the ocean
222	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
223	comm_inter, status, ierr )
224	!
225	!-- Receive v at the bottom surface from the ocean
226	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
227	comm_inter, status, ierr )
228	!
229	!-- Horizontal grid size or number of processors differs between
230	!-- ocean and atmosphere
231	ELSE
232
233	!
234	!-- Send heat flux at bottom surface to the ocean
235	total_2d_a = 0.0_wp
236	total_2d = 0.0_wp
237	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
238
239	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
240	comm2d, ierr )
241	CALL interpolate_to_ocean( 12 )
242	!
243	!-- Send humidity flux at bottom surface to the ocean
244	IF ( humidity ) THEN
245	total_2d_a = 0.0_wp
246	total_2d = 0.0_wp
247	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
248
249	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
250	0, comm2d, ierr )
251	CALL interpolate_to_ocean( 13 )
252	ENDIF
253	!
254	!-- Receive temperature at the bottom surface from the ocean
255	IF ( myid == 0 ) THEN
256	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
257	target_id, 14, comm_inter, status, ierr )
258	ENDIF
259	CALL MPI_BARRIER( comm2d, ierr )
260	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
261	ierr )
262	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
263	!
264	!-- Send momentum flux (u) at bottom surface to the ocean
265	total_2d_a = 0.0_wp
266	total_2d = 0.0_wp
267	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
268	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
269	comm2d, ierr )
270	CALL interpolate_to_ocean( 15 )
271	!
272	!-- Send momentum flux (v) at bottom surface to the ocean
273	total_2d_a = 0.0_wp
274	total_2d = 0.0_wp
275	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
276	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
277	comm2d, ierr )
278	CALL interpolate_to_ocean( 16 )
279	!
280	!-- Receive u 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, 17, 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	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
289	!
290	!-- Receive v at the bottom surface from the ocean
291	IF ( myid == 0 ) THEN
292	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
293	target_id, 18, comm_inter, status, ierr )
294	ENDIF
295	CALL MPI_BARRIER( comm2d, ierr )
296	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
297	ierr )
298	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
299
300	ENDIF
301
302	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
303
304	!
305	!-- Horizontal grid size and number of processors is equal
306	!-- in ocean and atmosphere
307	IF ( coupling_topology == 0 ) THEN
308	!
309	!-- Receive heat flux at the sea surface (top) from the atmosphere
310	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
311	comm_inter, status, ierr )
312	!
313	!-- Receive humidity flux from the atmosphere (bottom)
314	!-- and add it to the heat flux at the sea surface (top)...
315	IF ( humidity_remote ) THEN
316	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
317	target_id, 13, comm_inter, status, ierr )
318	ENDIF
319	!
320	!-- Send sea surface temperature to the atmosphere model
321	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
322	comm_inter, ierr )
323	!
324	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
325	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
326	comm_inter, status, ierr )
327	!
328	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
329	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
330	comm_inter, status, ierr )
331	!
332	!-- Send u to the atmosphere
333	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
334	comm_inter, ierr )
335	!
336	!-- Send v to the atmosphere
337	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
338	comm_inter, ierr )
339	!
340	!-- Horizontal gridsize or number of processors differs between
341	!-- ocean and atmosphere
342	ELSE
343	!
344	!-- Receive heat flux at the sea surface (top) from the atmosphere
345	IF ( myid == 0 ) THEN
346	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
347	target_id, 12, 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, comm2d, &
351	ierr )
352	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
353	!
354	!-- Receive humidity flux at the sea surface (top) from the atmosphere
355	IF ( humidity_remote ) THEN
356	IF ( myid == 0 ) THEN
357	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
358	target_id, 13, comm_inter, status, ierr )
359	ENDIF
360	CALL MPI_BARRIER( comm2d, ierr )
361	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
362	comm2d, ierr)
363	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
364	ENDIF
365	!
366	!-- Send surface temperature to atmosphere
367	total_2d_o = 0.0_wp
368	total_2d = 0.0_wp
369	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
370
371	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
372	comm2d, ierr)
373	CALL interpolate_to_atmos( 14 )
374	!
375	!-- Receive momentum flux (u) 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, 15, 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, &
382	0, comm2d, ierr )
383	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
384	!
385	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
386	IF ( myid == 0 ) THEN
387	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
388	target_id, 16, comm_inter, status, ierr )
389	ENDIF
390	CALL MPI_BARRIER( comm2d, ierr )
391	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
392	ierr )
393	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
394	!
395	!-- Send u to atmosphere
396	total_2d_o = 0.0_wp
397	total_2d = 0.0_wp
398	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
399	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
400	comm2d, ierr )
401	CALL interpolate_to_atmos( 17 )
402	!
403	!-- Send v to atmosphere
404	total_2d_o = 0.0_wp
405	total_2d = 0.0_wp
406	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
407	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
408	comm2d, ierr )
409	CALL interpolate_to_atmos( 18 )
410
411	ENDIF
412
413	!
414	!-- Conversions of fluxes received from atmosphere
415	IF ( humidity_remote ) THEN
416	!
417	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
418	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
419	!-- /(rho_atm(=1.0)*c_p)
420	tswst = tswst + qswst_remote * l_v / cp
421	!
422	!-- ...and convert it to a salinity flux at the sea surface (top)
423	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
424	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
425	saswst = -1.0_wp * sa(nzt,:,:) * 0.001_wp * qswst_remote / &
426	( rho_ocean(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001_wp ) )
427	ENDIF
428
429	!
430	!-- Adjust the kinematic heat flux with respect to ocean density
431	!-- (constants are the specific heat capacities for air and water)
432	!-- now tswst is the ocean top heat flux
433	tswst = tswst / rho_ocean(nzt,:,:) * cp / cpw
434
435	!
436	!-- Adjust the momentum fluxes with respect to ocean density
437	uswst = uswst / rho_ocean(nzt,:,:)
438	vswst = vswst / rho_ocean(nzt,:,:)
439
440	ENDIF
441
442	IF ( coupling_topology == 1 ) THEN
443	DEALLOCATE( total_2d_o, total_2d_a )
444	ENDIF
445
446	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
447
448	#endif
449
450	END SUBROUTINE surface_coupler
451
452
453
454	!------------------------------------------------------------------------------!
455	! Description:
456	! ------------
457	!> @todo Missing subroutine description.
458	!------------------------------------------------------------------------------!
459	SUBROUTINE interpolate_to_atmos( tag )
460
461	#if defined( __parallel )
462
463	USE arrays_3d, &
464	ONLY: total_2d_a, total_2d_o
465
466	USE indices, &
467	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
468
469	USE kinds
470
471	USE pegrid
472
473	IMPLICIT NONE
474
475	INTEGER(iwp) :: dnx !<
476	INTEGER(iwp) :: dnx2 !<
477	INTEGER(iwp) :: dny !<
478	INTEGER(iwp) :: dny2 !<
479	INTEGER(iwp) :: i !<
480	INTEGER(iwp) :: ii !<
481	INTEGER(iwp) :: j !<
482	INTEGER(iwp) :: jj !<
483
484	INTEGER(iwp), intent(in) :: tag !<
485
486	CALL MPI_BARRIER( comm2d, ierr )
487
488	IF ( myid == 0 ) THEN
489	!
490	!-- Cyclic boundary conditions for the total 2D-grid
491	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
492	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
493
494	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
495	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
496
497	!
498	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
499	dnx = (nx_o+1) / (nx_a+1)
500	dny = (ny_o+1) / (ny_a+1)
501
502	!
503	!-- Distance for interpolation around coarse grid points within the fine
504	!-- grid (note: 2*dnx2 must not be equal with dnx)
505	dnx2 = 2 * ( dnx / 2 )
506	dny2 = 2 * ( dny / 2 )
507
508	total_2d_a = 0.0_wp
509	!
510	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
511	DO j = 0, ny_a
512	DO i = 0, nx_a
513	DO jj = 0, dny2
514	DO ii = 0, dnx2
515	total_2d_a(j,i) = total_2d_a(j,i) &
516	+ total_2d_o(jdny+jj,idnx+ii)
517	ENDDO
518	ENDDO
519	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
520	ENDDO
521	ENDDO
522	!
523	!-- Cyclic boundary conditions for atmosphere grid
524	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
525	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
526
527	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
528	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
529	!
530	!-- Transfer of the atmosphere-grid-layer to the atmosphere
531	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
532	tag, comm_inter, ierr )
533
534	ENDIF
535
536	CALL MPI_BARRIER( comm2d, ierr )
537
538	#endif
539
540	END SUBROUTINE interpolate_to_atmos
541
542
543	!------------------------------------------------------------------------------!
544	! Description:
545	! ------------
546	!> @todo Missing subroutine description.
547	!------------------------------------------------------------------------------!
548	SUBROUTINE interpolate_to_ocean( tag )
549
550	#if defined( __parallel )
551
552	USE arrays_3d, &
553	ONLY: total_2d_a, total_2d_o
554
555	USE indices, &
556	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
557
558	USE kinds
559
560	USE pegrid
561
562	IMPLICIT NONE
563
564	INTEGER(iwp) :: dnx !<
565	INTEGER(iwp) :: dny !<
566	INTEGER(iwp) :: i !<
567	INTEGER(iwp) :: ii !<
568	INTEGER(iwp) :: j !<
569	INTEGER(iwp) :: jj !<
570	INTEGER(iwp), intent(in) :: tag !<
571
572	REAL(wp) :: fl !<
573	REAL(wp) :: fr !<
574	REAL(wp) :: myl !<
575	REAL(wp) :: myr !<
576
577	CALL MPI_BARRIER( comm2d, ierr )
578
579	IF ( myid == 0 ) THEN
580
581	!
582	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
583	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
584	dny = ( ny_o + 1 ) / ( ny_a + 1 )
585
586	!
587	!-- Cyclic boundary conditions for atmosphere grid
588	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
589	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
590
591	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
592	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
593	!
594	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
595	DO j = 0, ny
596	DO i = 0, nx
597	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
598	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
599	DO jj = 0, dny-1
600	fl = myl*jj + total_2d_a(j,i)
601	fr = myr*jj + total_2d_a(j,i+1)
602	DO ii = 0, dnx-1
603	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
604	ENDDO
605	ENDDO
606	ENDDO
607	ENDDO
608	!
609	!-- Cyclic boundary conditions for ocean grid
610	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
611	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
612
613	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
614	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
615
616	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
617	target_id, tag, comm_inter, ierr )
618
619	ENDIF
620
621	CALL MPI_BARRIER( comm2d, ierr )
622
623	#endif
624
625	END SUBROUTINE interpolate_to_ocean

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