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source: palm/trunk/SOURCE/surface_coupler.f90 @ 2000

Last change on this file since 2000 was 2000, checked in by knoop, 8 years ago
Forced header and separation lines into 80 columns
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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	! Forced header and separation lines into 80 columns
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 2000 2016-08-20 18:09:15Z knoop $
27	!
28	! 1682 2015-10-07 23:56:08Z knoop
29	! Code annotations made doxygen readable
30	!
31	! 1427 2014-07-07 14:04:59Z maronga
32	! Bugfix: value of l_v corrected.
33	!
34	! 1418 2014-06-06 13:05:08Z fricke
35	! Bugfix: For caluclation of the salinity flux at the sea surface,
36	! the given value for salinity must be in percent and not in psu
37	!
38	! 1353 2014-04-08 15:21:23Z heinze
39	! REAL constants provided with KIND-attribute
40	!
41	! 1324 2014-03-21 09:13:16Z suehring
42	! Bugfix: ONLY statement for module pegrid removed
43	!
44	! 1322 2014-03-20 16:38:49Z raasch
45	! REAL constants defined as wp-kind
46	!
47	! 1320 2014-03-20 08:40:49Z raasch
48	! ONLY-attribute added to USE-statements,
49	! kind-parameters added to all INTEGER and REAL declaration statements,
50	! kinds are defined in new module kinds,
51	! old module precision_kind is removed,
52	! revision history before 2012 removed,
53	! comment fields (!:) to be used for variable explanations added to
54	! all variable declaration statements
55	!
56	! 1318 2014-03-17 13:35:16Z raasch
57	! module interfaces removed
58	!
59	! 1092 2013-02-02 11:24:22Z raasch
60	! unused variables removed
61	!
62	! 1036 2012-10-22 13:43:42Z raasch
63	! code put under GPL (PALM 3.9)
64	!
65	! 880 2012-04-13 06:28:59Z raasch
66	! Bugfix: preprocessor statements for parallel execution added
67	!
68	! 109 2007-08-28 15:26:47Z letzel
69	! Initial revision
70	!
71	! Description:
72	! ------------
73	!> Data exchange at the interface between coupled models
74	!------------------------------------------------------------------------------!
75	SUBROUTINE surface_coupler
76
77
78	USE arrays_3d, &
79	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
80	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
81
82	USE cloud_parameters, &
83	ONLY: cp, l_v
84
85	USE control_parameters, &
86	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
87	humidity, humidity_remote, message_string, terminate_coupled, &
88	terminate_coupled_remote, time_since_reference_point
89
90	USE cpulog, &
91	ONLY: cpu_log, log_point
92
93	USE indices, &
94	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
95	nysg, ny_a, ny_o, nzt
96
97	USE kinds
98
99	USE pegrid
100
101	IMPLICIT NONE
102
103	REAL(wp) :: time_since_reference_point_rem !<
104	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
105
106	REAL(wp) :: cpw = 4218.0_wp !< heat capacity of water at constant pressure
107
108	#if defined( __parallel )
109
110	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
111
112
113
114	!
115	!-- In case of model termination initiated by the remote model
116	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
117	!-- The rest of the coupler must then be skipped because it would cause an MPI
118	!-- intercomminucation hang.
119	!-- If necessary, the coupler will be called at the beginning of the next
120	!-- restart run.
121
122	IF ( coupling_topology == 0 ) THEN
123	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
124	0, &
125	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
126	0, comm_inter, status, ierr )
127	ELSE
128	IF ( myid == 0) THEN
129	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
130	target_id, 0, &
131	terminate_coupled_remote, 1, MPI_INTEGER, &
132	target_id, 0, &
133	comm_inter, status, ierr )
134	ENDIF
135	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
136	ierr )
137
138	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
139	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
140
141	ENDIF
142
143	IF ( terminate_coupled_remote > 0 ) THEN
144	WRITE( message_string, * ) 'remote model "', &
145	TRIM( coupling_mode_remote ), &
146	'" terminated', &
147	'&with terminate_coupled_remote = ', &
148	terminate_coupled_remote, &
149	'&local model "', TRIM( coupling_mode ), &
150	'" has', &
151	'&terminate_coupled = ', &
152	terminate_coupled
153	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
154	RETURN
155	ENDIF
156
157
158	!
159	!-- Exchange the current simulated time between the models,
160	!-- currently just for total_2ding
161	IF ( coupling_topology == 0 ) THEN
162
163	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
164	comm_inter, ierr )
165	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
166	11, comm_inter, status, ierr )
167	ELSE
168
169	IF ( myid == 0 ) THEN
170
171	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
172	11, comm_inter, ierr )
173	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
174	target_id, 11, comm_inter, status, ierr )
175
176	ENDIF
177
178	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
179	ierr )
180
181	ENDIF
182
183	!
184	!-- Exchange the interface data
185	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
186
187	!
188	!-- Horizontal grid size and number of processors is equal in ocean and
189	!-- atmosphere
190	IF ( coupling_topology == 0 ) THEN
191
192	!
193	!-- Send heat flux at bottom surface to the ocean
194	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
195	comm_inter, ierr )
196	!
197	!-- Send humidity flux at bottom surface to the ocean
198	IF ( humidity ) THEN
199	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
200	comm_inter, ierr )
201	ENDIF
202	!
203	!-- Receive temperature at the bottom surface from the ocean
204	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
205	comm_inter, status, ierr )
206	!
207	!-- Send the momentum flux (u) at bottom surface to the ocean
208	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
209	comm_inter, ierr )
210	!
211	!-- Send the momentum flux (v) at bottom surface to the ocean
212	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
213	comm_inter, ierr )
214	!
215	!-- Receive u at the bottom surface from the ocean
216	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
217	comm_inter, status, ierr )
218	!
219	!-- Receive v at the bottom surface from the ocean
220	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
221	comm_inter, status, ierr )
222	!
223	!-- Horizontal grid size or number of processors differs between
224	!-- ocean and atmosphere
225	ELSE
226
227	!
228	!-- Send heat flux at bottom surface to the ocean
229	total_2d_a = 0.0_wp
230	total_2d = 0.0_wp
231	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
232
233	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
234	comm2d, ierr )
235	CALL interpolate_to_ocean( 12 )
236	!
237	!-- Send humidity flux at bottom surface to the ocean
238	IF ( humidity ) THEN
239	total_2d_a = 0.0_wp
240	total_2d = 0.0_wp
241	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
242
243	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
244	0, comm2d, ierr )
245	CALL interpolate_to_ocean( 13 )
246	ENDIF
247	!
248	!-- Receive temperature at the bottom surface from the ocean
249	IF ( myid == 0 ) THEN
250	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
251	target_id, 14, comm_inter, status, ierr )
252	ENDIF
253	CALL MPI_BARRIER( comm2d, ierr )
254	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
255	ierr )
256	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
257	!
258	!-- Send momentum flux (u) at bottom surface to the ocean
259	total_2d_a = 0.0_wp
260	total_2d = 0.0_wp
261	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
262	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
263	comm2d, ierr )
264	CALL interpolate_to_ocean( 15 )
265	!
266	!-- Send momentum flux (v) at bottom surface to the ocean
267	total_2d_a = 0.0_wp
268	total_2d = 0.0_wp
269	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
270	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
271	comm2d, ierr )
272	CALL interpolate_to_ocean( 16 )
273	!
274	!-- Receive u at the bottom surface from the ocean
275	IF ( myid == 0 ) THEN
276	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
277	target_id, 17, comm_inter, status, ierr )
278	ENDIF
279	CALL MPI_BARRIER( comm2d, ierr )
280	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
281	ierr )
282	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
283	!
284	!-- Receive v at the bottom surface from the ocean
285	IF ( myid == 0 ) THEN
286	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
287	target_id, 18, comm_inter, status, ierr )
288	ENDIF
289	CALL MPI_BARRIER( comm2d, ierr )
290	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
291	ierr )
292	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
293
294	ENDIF
295
296	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
297
298	!
299	!-- Horizontal grid size and number of processors is equal
300	!-- in ocean and atmosphere
301	IF ( coupling_topology == 0 ) THEN
302	!
303	!-- Receive heat flux at the sea surface (top) from the atmosphere
304	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
305	comm_inter, status, ierr )
306	!
307	!-- Receive humidity flux from the atmosphere (bottom)
308	!-- and add it to the heat flux at the sea surface (top)...
309	IF ( humidity_remote ) THEN
310	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
311	target_id, 13, comm_inter, status, ierr )
312	ENDIF
313	!
314	!-- Send sea surface temperature to the atmosphere model
315	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
316	comm_inter, ierr )
317	!
318	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
319	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
320	comm_inter, status, ierr )
321	!
322	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
323	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
324	comm_inter, status, ierr )
325	!
326	!-- Send u to the atmosphere
327	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
328	comm_inter, ierr )
329	!
330	!-- Send v to the atmosphere
331	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
332	comm_inter, ierr )
333	!
334	!-- Horizontal gridsize or number of processors differs between
335	!-- ocean and atmosphere
336	ELSE
337	!
338	!-- Receive heat flux at the sea surface (top) from the atmosphere
339	IF ( myid == 0 ) THEN
340	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
341	target_id, 12, comm_inter, status, ierr )
342	ENDIF
343	CALL MPI_BARRIER( comm2d, ierr )
344	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
345	ierr )
346	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
347	!
348	!-- Receive humidity flux at the sea surface (top) from the atmosphere
349	IF ( humidity_remote ) THEN
350	IF ( myid == 0 ) THEN
351	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
352	target_id, 13, comm_inter, status, ierr )
353	ENDIF
354	CALL MPI_BARRIER( comm2d, ierr )
355	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
356	comm2d, ierr)
357	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
358	ENDIF
359	!
360	!-- Send surface temperature to atmosphere
361	total_2d_o = 0.0_wp
362	total_2d = 0.0_wp
363	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
364
365	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
366	comm2d, ierr)
367	CALL interpolate_to_atmos( 14 )
368	!
369	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
370	IF ( myid == 0 ) THEN
371	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
372	target_id, 15, comm_inter, status, ierr )
373	ENDIF
374	CALL MPI_BARRIER( comm2d, ierr )
375	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
376	0, comm2d, ierr )
377	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
378	!
379	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
380	IF ( myid == 0 ) THEN
381	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
382	target_id, 16, comm_inter, status, ierr )
383	ENDIF
384	CALL MPI_BARRIER( comm2d, ierr )
385	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
386	ierr )
387	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
388	!
389	!-- Send u to atmosphere
390	total_2d_o = 0.0_wp
391	total_2d = 0.0_wp
392	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
393	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
394	comm2d, ierr )
395	CALL interpolate_to_atmos( 17 )
396	!
397	!-- Send v to atmosphere
398	total_2d_o = 0.0_wp
399	total_2d = 0.0_wp
400	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
401	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
402	comm2d, ierr )
403	CALL interpolate_to_atmos( 18 )
404
405	ENDIF
406
407	!
408	!-- Conversions of fluxes received from atmosphere
409	IF ( humidity_remote ) THEN
410	!
411	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
412	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
413	!-- /(rho_atm(=1.0)*c_p)
414	tswst = tswst + qswst_remote * l_v / cp
415	!
416	!-- ...and convert it to a salinity flux at the sea surface (top)
417	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
418	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
419	saswst = -1.0_wp * sa(nzt,:,:) * 0.001_wp * qswst_remote / &
420	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001_wp ) )
421	ENDIF
422
423	!
424	!-- Adjust the kinematic heat flux with respect to ocean density
425	!-- (constants are the specific heat capacities for air and water)
426	!-- now tswst is the ocean top heat flux
427	tswst = tswst / rho(nzt,:,:) * cp / cpw
428
429	!
430	!-- Adjust the momentum fluxes with respect to ocean density
431	uswst = uswst / rho(nzt,:,:)
432	vswst = vswst / rho(nzt,:,:)
433
434	ENDIF
435
436	IF ( coupling_topology == 1 ) THEN
437	DEALLOCATE( total_2d_o, total_2d_a )
438	ENDIF
439
440	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
441
442	#endif
443
444	END SUBROUTINE surface_coupler
445
446
447
448	!------------------------------------------------------------------------------!
449	! Description:
450	! ------------
451	!> @todo Missing subroutine description.
452	!------------------------------------------------------------------------------!
453	SUBROUTINE interpolate_to_atmos( tag )
454
455	#if defined( __parallel )
456
457	USE arrays_3d, &
458	ONLY: total_2d_a, total_2d_o
459
460	USE indices, &
461	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
462
463	USE kinds
464
465	USE pegrid
466
467	IMPLICIT NONE
468
469	INTEGER(iwp) :: dnx !<
470	INTEGER(iwp) :: dnx2 !<
471	INTEGER(iwp) :: dny !<
472	INTEGER(iwp) :: dny2 !<
473	INTEGER(iwp) :: i !<
474	INTEGER(iwp) :: ii !<
475	INTEGER(iwp) :: j !<
476	INTEGER(iwp) :: jj !<
477
478	INTEGER(iwp), intent(in) :: tag !<
479
480	CALL MPI_BARRIER( comm2d, ierr )
481
482	IF ( myid == 0 ) THEN
483	!
484	!-- Cyclic boundary conditions for the total 2D-grid
485	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
486	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
487
488	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
489	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
490
491	!
492	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
493	dnx = (nx_o+1) / (nx_a+1)
494	dny = (ny_o+1) / (ny_a+1)
495
496	!
497	!-- Distance for interpolation around coarse grid points within the fine
498	!-- grid (note: 2*dnx2 must not be equal with dnx)
499	dnx2 = 2 * ( dnx / 2 )
500	dny2 = 2 * ( dny / 2 )
501
502	total_2d_a = 0.0_wp
503	!
504	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
505	DO j = 0, ny_a
506	DO i = 0, nx_a
507	DO jj = 0, dny2
508	DO ii = 0, dnx2
509	total_2d_a(j,i) = total_2d_a(j,i) &
510	+ total_2d_o(jdny+jj,idnx+ii)
511	ENDDO
512	ENDDO
513	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
514	ENDDO
515	ENDDO
516	!
517	!-- Cyclic boundary conditions for atmosphere grid
518	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
519	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
520
521	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
522	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
523	!
524	!-- Transfer of the atmosphere-grid-layer to the atmosphere
525	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
526	tag, comm_inter, ierr )
527
528	ENDIF
529
530	CALL MPI_BARRIER( comm2d, ierr )
531
532	#endif
533
534	END SUBROUTINE interpolate_to_atmos
535
536
537	!------------------------------------------------------------------------------!
538	! Description:
539	! ------------
540	!> @todo Missing subroutine description.
541	!------------------------------------------------------------------------------!
542	SUBROUTINE interpolate_to_ocean( tag )
543
544	#if defined( __parallel )
545
546	USE arrays_3d, &
547	ONLY: total_2d_a, total_2d_o
548
549	USE indices, &
550	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
551
552	USE kinds
553
554	USE pegrid
555
556	IMPLICIT NONE
557
558	INTEGER(iwp) :: dnx !<
559	INTEGER(iwp) :: dny !<
560	INTEGER(iwp) :: i !<
561	INTEGER(iwp) :: ii !<
562	INTEGER(iwp) :: j !<
563	INTEGER(iwp) :: jj !<
564	INTEGER(iwp), intent(in) :: tag !<
565
566	REAL(wp) :: fl !<
567	REAL(wp) :: fr !<
568	REAL(wp) :: myl !<
569	REAL(wp) :: myr !<
570
571	CALL MPI_BARRIER( comm2d, ierr )
572
573	IF ( myid == 0 ) THEN
574
575	!
576	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
577	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
578	dny = ( ny_o + 1 ) / ( ny_a + 1 )
579
580	!
581	!-- Cyclic boundary conditions for atmosphere grid
582	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
583	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
584
585	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
586	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
587	!
588	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
589	DO j = 0, ny
590	DO i = 0, nx
591	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
592	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
593	DO jj = 0, dny-1
594	fl = myl*jj + total_2d_a(j,i)
595	fr = myr*jj + total_2d_a(j,i+1)
596	DO ii = 0, dnx-1
597	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
598	ENDDO
599	ENDDO
600	ENDDO
601	ENDDO
602	!
603	!-- Cyclic boundary conditions for ocean grid
604	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
605	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
606
607	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
608	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
609
610	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
611	target_id, tag, comm_inter, ierr )
612
613	ENDIF
614
615	CALL MPI_BARRIER( comm2d, ierr )
616
617	#endif
618
619	END SUBROUTINE interpolate_to_ocean

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