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source: palm/trunk/SOURCE/surface_coupler.f90 @ 2007

Last change on this file since 2007 was 2001, 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 2001 2016-08-20 18:41:22Z kanani $
27	!
28	! 2000 2016-08-20 18:09:15Z knoop
29	! Forced header and separation lines into 80 columns
30	!
31	! 1682 2015-10-07 23:56:08Z knoop
32	! Code annotations made doxygen readable
33	!
34	! 1427 2014-07-07 14:04:59Z maronga
35	! Bugfix: value of l_v corrected.
36	!
37	! 1418 2014-06-06 13:05:08Z fricke
38	! Bugfix: For caluclation of the salinity flux at the sea surface,
39	! the given value for salinity must be in percent and not in psu
40	!
41	! 1353 2014-04-08 15:21:23Z heinze
42	! REAL constants provided with KIND-attribute
43	!
44	! 1324 2014-03-21 09:13:16Z suehring
45	! Bugfix: ONLY statement for module pegrid removed
46	!
47	! 1322 2014-03-20 16:38:49Z raasch
48	! REAL constants defined as wp-kind
49	!
50	! 1320 2014-03-20 08:40:49Z raasch
51	! ONLY-attribute added to USE-statements,
52	! kind-parameters added to all INTEGER and REAL declaration statements,
53	! kinds are defined in new module kinds,
54	! old module precision_kind is removed,
55	! revision history before 2012 removed,
56	! comment fields (!:) to be used for variable explanations added to
57	! all variable declaration statements
58	!
59	! 1318 2014-03-17 13:35:16Z raasch
60	! module interfaces removed
61	!
62	! 1092 2013-02-02 11:24:22Z raasch
63	! unused variables removed
64	!
65	! 1036 2012-10-22 13:43:42Z raasch
66	! code put under GPL (PALM 3.9)
67	!
68	! 880 2012-04-13 06:28:59Z raasch
69	! Bugfix: preprocessor statements for parallel execution added
70	!
71	! 109 2007-08-28 15:26:47Z letzel
72	! Initial revision
73	!
74	! Description:
75	! ------------
76	!> Data exchange at the interface between coupled models
77	!------------------------------------------------------------------------------!
78	SUBROUTINE surface_coupler
79
80
81	USE arrays_3d, &
82	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
83	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
84
85	USE cloud_parameters, &
86	ONLY: cp, l_v
87
88	USE control_parameters, &
89	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
90	humidity, humidity_remote, message_string, terminate_coupled, &
91	terminate_coupled_remote, time_since_reference_point
92
93	USE cpulog, &
94	ONLY: cpu_log, log_point
95
96	USE indices, &
97	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
98	nysg, ny_a, ny_o, nzt
99
100	USE kinds
101
102	USE pegrid
103
104	IMPLICIT NONE
105
106	REAL(wp) :: time_since_reference_point_rem !<
107	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
108
109	REAL(wp) :: cpw = 4218.0_wp !< heat capacity of water at constant pressure
110
111	#if defined( __parallel )
112
113	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
114
115
116
117	!
118	!-- In case of model termination initiated by the remote model
119	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
120	!-- The rest of the coupler must then be skipped because it would cause an MPI
121	!-- intercomminucation hang.
122	!-- If necessary, the coupler will be called at the beginning of the next
123	!-- restart run.
124
125	IF ( coupling_topology == 0 ) THEN
126	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
127	0, &
128	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
129	0, comm_inter, status, ierr )
130	ELSE
131	IF ( myid == 0) THEN
132	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
133	target_id, 0, &
134	terminate_coupled_remote, 1, MPI_INTEGER, &
135	target_id, 0, &
136	comm_inter, status, ierr )
137	ENDIF
138	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
139	ierr )
140
141	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
142	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
143
144	ENDIF
145
146	IF ( terminate_coupled_remote > 0 ) THEN
147	WRITE( message_string, * ) 'remote model "', &
148	TRIM( coupling_mode_remote ), &
149	'" terminated', &
150	'&with terminate_coupled_remote = ', &
151	terminate_coupled_remote, &
152	'&local model "', TRIM( coupling_mode ), &
153	'" has', &
154	'&terminate_coupled = ', &
155	terminate_coupled
156	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
157	RETURN
158	ENDIF
159
160
161	!
162	!-- Exchange the current simulated time between the models,
163	!-- currently just for total_2ding
164	IF ( coupling_topology == 0 ) THEN
165
166	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
167	comm_inter, ierr )
168	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
169	11, comm_inter, status, ierr )
170	ELSE
171
172	IF ( myid == 0 ) THEN
173
174	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
175	11, comm_inter, ierr )
176	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
177	target_id, 11, comm_inter, status, ierr )
178
179	ENDIF
180
181	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
182	ierr )
183
184	ENDIF
185
186	!
187	!-- Exchange the interface data
188	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
189
190	!
191	!-- Horizontal grid size and number of processors is equal in ocean and
192	!-- atmosphere
193	IF ( coupling_topology == 0 ) THEN
194
195	!
196	!-- Send heat flux at bottom surface to the ocean
197	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
198	comm_inter, ierr )
199	!
200	!-- Send humidity flux at bottom surface to the ocean
201	IF ( humidity ) THEN
202	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
203	comm_inter, ierr )
204	ENDIF
205	!
206	!-- Receive temperature at the bottom surface from the ocean
207	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
208	comm_inter, status, ierr )
209	!
210	!-- Send the momentum flux (u) at bottom surface to the ocean
211	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
212	comm_inter, ierr )
213	!
214	!-- Send the momentum flux (v) at bottom surface to the ocean
215	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
216	comm_inter, ierr )
217	!
218	!-- Receive u at the bottom surface from the ocean
219	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
220	comm_inter, status, ierr )
221	!
222	!-- Receive v at the bottom surface from the ocean
223	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
224	comm_inter, status, ierr )
225	!
226	!-- Horizontal grid size or number of processors differs between
227	!-- ocean and atmosphere
228	ELSE
229
230	!
231	!-- Send heat flux at bottom surface to the ocean
232	total_2d_a = 0.0_wp
233	total_2d = 0.0_wp
234	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
235
236	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
237	comm2d, ierr )
238	CALL interpolate_to_ocean( 12 )
239	!
240	!-- Send humidity flux at bottom surface to the ocean
241	IF ( humidity ) THEN
242	total_2d_a = 0.0_wp
243	total_2d = 0.0_wp
244	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
245
246	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
247	0, comm2d, ierr )
248	CALL interpolate_to_ocean( 13 )
249	ENDIF
250	!
251	!-- Receive temperature at the bottom surface from the ocean
252	IF ( myid == 0 ) THEN
253	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
254	target_id, 14, comm_inter, status, ierr )
255	ENDIF
256	CALL MPI_BARRIER( comm2d, ierr )
257	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
258	ierr )
259	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
260	!
261	!-- Send momentum flux (u) 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) = usws(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( 15 )
268	!
269	!-- Send momentum flux (v) at bottom surface to the ocean
270	total_2d_a = 0.0_wp
271	total_2d = 0.0_wp
272	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
273	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
274	comm2d, ierr )
275	CALL interpolate_to_ocean( 16 )
276	!
277	!-- Receive u at the bottom surface from the ocean
278	IF ( myid == 0 ) THEN
279	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
280	target_id, 17, comm_inter, status, ierr )
281	ENDIF
282	CALL MPI_BARRIER( comm2d, ierr )
283	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
284	ierr )
285	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
286	!
287	!-- Receive v at the bottom surface from the ocean
288	IF ( myid == 0 ) THEN
289	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
290	target_id, 18, comm_inter, status, ierr )
291	ENDIF
292	CALL MPI_BARRIER( comm2d, ierr )
293	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
294	ierr )
295	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
296
297	ENDIF
298
299	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
300
301	!
302	!-- Horizontal grid size and number of processors is equal
303	!-- in ocean and atmosphere
304	IF ( coupling_topology == 0 ) THEN
305	!
306	!-- Receive heat flux at the sea surface (top) from the atmosphere
307	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
308	comm_inter, status, ierr )
309	!
310	!-- Receive humidity flux from the atmosphere (bottom)
311	!-- and add it to the heat flux at the sea surface (top)...
312	IF ( humidity_remote ) THEN
313	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
314	target_id, 13, comm_inter, status, ierr )
315	ENDIF
316	!
317	!-- Send sea surface temperature to the atmosphere model
318	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
319	comm_inter, ierr )
320	!
321	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
322	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
323	comm_inter, status, ierr )
324	!
325	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
326	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
327	comm_inter, status, ierr )
328	!
329	!-- Send u to the atmosphere
330	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
331	comm_inter, ierr )
332	!
333	!-- Send v to the atmosphere
334	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
335	comm_inter, ierr )
336	!
337	!-- Horizontal gridsize or number of processors differs between
338	!-- ocean and atmosphere
339	ELSE
340	!
341	!-- Receive heat flux at the sea surface (top) from the atmosphere
342	IF ( myid == 0 ) THEN
343	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
344	target_id, 12, comm_inter, status, ierr )
345	ENDIF
346	CALL MPI_BARRIER( comm2d, ierr )
347	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
348	ierr )
349	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
350	!
351	!-- Receive humidity flux at the sea surface (top) from the atmosphere
352	IF ( humidity_remote ) THEN
353	IF ( myid == 0 ) THEN
354	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
355	target_id, 13, comm_inter, status, ierr )
356	ENDIF
357	CALL MPI_BARRIER( comm2d, ierr )
358	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
359	comm2d, ierr)
360	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
361	ENDIF
362	!
363	!-- Send surface temperature to atmosphere
364	total_2d_o = 0.0_wp
365	total_2d = 0.0_wp
366	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
367
368	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
369	comm2d, ierr)
370	CALL interpolate_to_atmos( 14 )
371	!
372	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
373	IF ( myid == 0 ) THEN
374	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
375	target_id, 15, comm_inter, status, ierr )
376	ENDIF
377	CALL MPI_BARRIER( comm2d, ierr )
378	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
379	0, comm2d, ierr )
380	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
381	!
382	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
383	IF ( myid == 0 ) THEN
384	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
385	target_id, 16, comm_inter, status, ierr )
386	ENDIF
387	CALL MPI_BARRIER( comm2d, ierr )
388	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
389	ierr )
390	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
391	!
392	!-- Send u to atmosphere
393	total_2d_o = 0.0_wp
394	total_2d = 0.0_wp
395	total_2d(nys:nyn,nxl:nxr) = u(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( 17 )
399	!
400	!-- Send v to atmosphere
401	total_2d_o = 0.0_wp
402	total_2d = 0.0_wp
403	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
404	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
405	comm2d, ierr )
406	CALL interpolate_to_atmos( 18 )
407
408	ENDIF
409
410	!
411	!-- Conversions of fluxes received from atmosphere
412	IF ( humidity_remote ) THEN
413	!
414	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
415	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
416	!-- /(rho_atm(=1.0)*c_p)
417	tswst = tswst + qswst_remote * l_v / cp
418	!
419	!-- ...and convert it to a salinity flux at the sea surface (top)
420	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
421	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
422	saswst = -1.0_wp * sa(nzt,:,:) * 0.001_wp * qswst_remote / &
423	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001_wp ) )
424	ENDIF
425
426	!
427	!-- Adjust the kinematic heat flux with respect to ocean density
428	!-- (constants are the specific heat capacities for air and water)
429	!-- now tswst is the ocean top heat flux
430	tswst = tswst / rho(nzt,:,:) * cp / cpw
431
432	!
433	!-- Adjust the momentum fluxes with respect to ocean density
434	uswst = uswst / rho(nzt,:,:)
435	vswst = vswst / rho(nzt,:,:)
436
437	ENDIF
438
439	IF ( coupling_topology == 1 ) THEN
440	DEALLOCATE( total_2d_o, total_2d_a )
441	ENDIF
442
443	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
444
445	#endif
446
447	END SUBROUTINE surface_coupler
448
449
450
451	!------------------------------------------------------------------------------!
452	! Description:
453	! ------------
454	!> @todo Missing subroutine description.
455	!------------------------------------------------------------------------------!
456	SUBROUTINE interpolate_to_atmos( tag )
457
458	#if defined( __parallel )
459
460	USE arrays_3d, &
461	ONLY: total_2d_a, total_2d_o
462
463	USE indices, &
464	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
465
466	USE kinds
467
468	USE pegrid
469
470	IMPLICIT NONE
471
472	INTEGER(iwp) :: dnx !<
473	INTEGER(iwp) :: dnx2 !<
474	INTEGER(iwp) :: dny !<
475	INTEGER(iwp) :: dny2 !<
476	INTEGER(iwp) :: i !<
477	INTEGER(iwp) :: ii !<
478	INTEGER(iwp) :: j !<
479	INTEGER(iwp) :: jj !<
480
481	INTEGER(iwp), intent(in) :: tag !<
482
483	CALL MPI_BARRIER( comm2d, ierr )
484
485	IF ( myid == 0 ) THEN
486	!
487	!-- Cyclic boundary conditions for the total 2D-grid
488	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
489	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
490
491	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
492	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
493
494	!
495	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
496	dnx = (nx_o+1) / (nx_a+1)
497	dny = (ny_o+1) / (ny_a+1)
498
499	!
500	!-- Distance for interpolation around coarse grid points within the fine
501	!-- grid (note: 2*dnx2 must not be equal with dnx)
502	dnx2 = 2 * ( dnx / 2 )
503	dny2 = 2 * ( dny / 2 )
504
505	total_2d_a = 0.0_wp
506	!
507	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
508	DO j = 0, ny_a
509	DO i = 0, nx_a
510	DO jj = 0, dny2
511	DO ii = 0, dnx2
512	total_2d_a(j,i) = total_2d_a(j,i) &
513	+ total_2d_o(jdny+jj,idnx+ii)
514	ENDDO
515	ENDDO
516	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
517	ENDDO
518	ENDDO
519	!
520	!-- Cyclic boundary conditions for atmosphere grid
521	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
522	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
523
524	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
525	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
526	!
527	!-- Transfer of the atmosphere-grid-layer to the atmosphere
528	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
529	tag, comm_inter, ierr )
530
531	ENDIF
532
533	CALL MPI_BARRIER( comm2d, ierr )
534
535	#endif
536
537	END SUBROUTINE interpolate_to_atmos
538
539
540	!------------------------------------------------------------------------------!
541	! Description:
542	! ------------
543	!> @todo Missing subroutine description.
544	!------------------------------------------------------------------------------!
545	SUBROUTINE interpolate_to_ocean( tag )
546
547	#if defined( __parallel )
548
549	USE arrays_3d, &
550	ONLY: total_2d_a, total_2d_o
551
552	USE indices, &
553	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
554
555	USE kinds
556
557	USE pegrid
558
559	IMPLICIT NONE
560
561	INTEGER(iwp) :: dnx !<
562	INTEGER(iwp) :: dny !<
563	INTEGER(iwp) :: i !<
564	INTEGER(iwp) :: ii !<
565	INTEGER(iwp) :: j !<
566	INTEGER(iwp) :: jj !<
567	INTEGER(iwp), intent(in) :: tag !<
568
569	REAL(wp) :: fl !<
570	REAL(wp) :: fr !<
571	REAL(wp) :: myl !<
572	REAL(wp) :: myr !<
573
574	CALL MPI_BARRIER( comm2d, ierr )
575
576	IF ( myid == 0 ) THEN
577
578	!
579	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
580	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
581	dny = ( ny_o + 1 ) / ( ny_a + 1 )
582
583	!
584	!-- Cyclic boundary conditions for atmosphere grid
585	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
586	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
587
588	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
589	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
590	!
591	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
592	DO j = 0, ny
593	DO i = 0, nx
594	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
595	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
596	DO jj = 0, dny-1
597	fl = myl*jj + total_2d_a(j,i)
598	fr = myr*jj + total_2d_a(j,i+1)
599	DO ii = 0, dnx-1
600	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
601	ENDDO
602	ENDDO
603	ENDDO
604	ENDDO
605	!
606	!-- Cyclic boundary conditions for ocean grid
607	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
608	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
609
610	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
611	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
612
613	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
614	target_id, tag, comm_inter, ierr )
615
616	ENDIF
617
618	CALL MPI_BARRIER( comm2d, ierr )
619
620	#endif
621
622	END SUBROUTINE interpolate_to_ocean

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