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source: palm/trunk/SOURCE/surface_coupler.f90 @ 2481

Last change on this file since 2481 was 2233, checked in by suehring, 7 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 1997-2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 2233 2017-05-30 18:08:54Z raasch $
27	!
28	! 2232 2017-05-30 17:47:52Z suehring
29	! Adjust to new surface structure. Transfer 1D surface fluxes onto 2D grid
30	! (and back).
31	!
32	! 2031 2016-10-21 15:11:58Z knoop
33	! renamed variable rho to rho_ocean
34	!
35	! 2000 2016-08-20 18:09:15Z knoop
36	! Forced header and separation lines into 80 columns
37	!
38	! 1682 2015-10-07 23:56:08Z knoop
39	! Code annotations made doxygen readable
40	!
41	! 1427 2014-07-07 14:04:59Z maronga
42	! Bugfix: value of l_v corrected.
43	!
44	! 1418 2014-06-06 13:05:08Z fricke
45	! Bugfix: For caluclation of the salinity flux at the sea surface,
46	! the given value for salinity must be in percent and not in psu
47	!
48	! 1353 2014-04-08 15:21:23Z heinze
49	! REAL constants provided with KIND-attribute
50	!
51	! 1324 2014-03-21 09:13:16Z suehring
52	! Bugfix: ONLY statement for module pegrid removed
53	!
54	! 1322 2014-03-20 16:38:49Z raasch
55	! REAL constants defined as wp-kind
56	!
57	! 1320 2014-03-20 08:40:49Z raasch
58	! ONLY-attribute added to USE-statements,
59	! kind-parameters added to all INTEGER and REAL declaration statements,
60	! kinds are defined in new module kinds,
61	! old module precision_kind is removed,
62	! revision history before 2012 removed,
63	! comment fields (!:) to be used for variable explanations added to
64	! all variable declaration statements
65	!
66	! 1318 2014-03-17 13:35:16Z raasch
67	! module interfaces removed
68	!
69	! 1092 2013-02-02 11:24:22Z raasch
70	! unused variables removed
71	!
72	! 1036 2012-10-22 13:43:42Z raasch
73	! code put under GPL (PALM 3.9)
74	!
75	! 880 2012-04-13 06:28:59Z raasch
76	! Bugfix: preprocessor statements for parallel execution added
77	!
78	! 109 2007-08-28 15:26:47Z letzel
79	! Initial revision
80	!
81	! Description:
82	! ------------
83	!> Data exchange at the interface between coupled models
84	!------------------------------------------------------------------------------!
85	SUBROUTINE surface_coupler
86
87
88	USE arrays_3d, &
89	ONLY: pt, rho_ocean, sa, total_2d_a, total_2d_o, u, v
90
91	USE cloud_parameters, &
92	ONLY: cp, l_v
93
94	USE control_parameters, &
95	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
96	humidity, humidity_remote, land_surface, message_string, &
97	terminate_coupled, terminate_coupled_remote, &
98	time_since_reference_point, urban_surface
99
100	USE cpulog, &
101	ONLY: cpu_log, log_point
102
103	USE indices, &
104	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
105	nysg, ny_a, ny_o, nzt
106
107	USE kinds
108
109	USE pegrid
110
111	USE surface_mod, &
112	ONLY : surf_def_h, surf_lsm_h, surf_type, surf_usm_h
113
114	IMPLICIT NONE
115
116	INTEGER(iwp) :: i !< index variable x-direction
117	INTEGER(iwp) :: j !< index variable y-direction
118	INTEGER(iwp) :: m !< running index for surface elements
119
120	REAL(wp) :: cpw = 4218.0_wp !< heat capacity of water at constant pressure
121	REAL(wp) :: time_since_reference_point_rem !<
122	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
123
124	REAL(wp), DIMENSION(nysg:nyng,nxlg:nxrg) :: surface_flux !< dummy array for surface fluxes on 2D grid
125
126
127	#if defined( __parallel )
128
129	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
130
131
132
133	!
134	!-- In case of model termination initiated by the remote model
135	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
136	!-- The rest of the coupler must then be skipped because it would cause an MPI
137	!-- intercomminucation hang.
138	!-- If necessary, the coupler will be called at the beginning of the next
139	!-- restart run.
140
141	IF ( coupling_topology == 0 ) THEN
142	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
143	0, &
144	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
145	0, comm_inter, status, ierr )
146	ELSE
147	IF ( myid == 0) THEN
148	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
149	target_id, 0, &
150	terminate_coupled_remote, 1, MPI_INTEGER, &
151	target_id, 0, &
152	comm_inter, status, ierr )
153	ENDIF
154	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
155	ierr )
156
157	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
158	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
159
160	ENDIF
161
162	IF ( terminate_coupled_remote > 0 ) THEN
163	WRITE( message_string, * ) 'remote model "', &
164	TRIM( coupling_mode_remote ), &
165	'" terminated', &
166	'&with terminate_coupled_remote = ', &
167	terminate_coupled_remote, &
168	'&local model "', TRIM( coupling_mode ), &
169	'" has', &
170	'&terminate_coupled = ', &
171	terminate_coupled
172	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
173	RETURN
174	ENDIF
175
176
177	!
178	!-- Exchange the current simulated time between the models,
179	!-- currently just for total_2d
180	IF ( coupling_topology == 0 ) THEN
181
182	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
183	comm_inter, ierr )
184	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
185	11, comm_inter, status, ierr )
186	ELSE
187
188	IF ( myid == 0 ) THEN
189
190	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
191	11, comm_inter, ierr )
192	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
193	target_id, 11, comm_inter, status, ierr )
194
195	ENDIF
196
197	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
198	ierr )
199
200	ENDIF
201
202	!
203	!-- Exchange the interface data
204	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
205
206	!
207	!-- Horizontal grid size and number of processors is equal in ocean and
208	!-- atmosphere
209	IF ( coupling_topology == 0 ) THEN
210
211	!
212	!-- Send heat flux at bottom surface to the ocean. First, transfer from
213	!-- 1D surface type to 2D grid.
214	CALL transfer_1D_to_2D_equal( surf_def_h(0)%shf, surf_lsm_h%shf, &
215	surf_usm_h%shf )
216	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, &
217	12, comm_inter, ierr )
218	!
219	!-- Send humidity flux at bottom surface to the ocean. First, transfer
220	!-- from 1D surface type to 2D grid.
221	CALL transfer_1D_to_2D_equal( surf_def_h(0)%qsws, surf_lsm_h%qsws, &
222	surf_usm_h%qsws )
223	IF ( humidity ) THEN
224	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, &
225	target_id, 13, comm_inter, ierr )
226	ENDIF
227	!
228	!-- Receive temperature at the bottom surface from the ocean
229	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
230	comm_inter, status, ierr )
231	!
232	!-- Send the momentum flux (u) at bottom surface to the ocean. First,
233	!-- transfer from 1D surface type to 2D grid.
234	CALL transfer_1D_to_2D_equal( surf_def_h(0)%usws, surf_lsm_h%usws, &
235	surf_usm_h%usws )
236	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, &
237	15, comm_inter, ierr )
238	!
239	!-- Send the momentum flux (v) at bottom surface to the ocean. First,
240	!-- transfer from 1D surface type to 2D grid.
241	CALL transfer_1D_to_2D_equal( surf_def_h(0)%vsws, surf_lsm_h%vsws, &
242	surf_usm_h%vsws )
243	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, &
244	16, comm_inter, ierr )
245	!
246	!-- Receive u at the bottom surface from the ocean
247	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
248	comm_inter, status, ierr )
249	!
250	!-- Receive v at the bottom surface from the ocean
251	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
252	comm_inter, status, ierr )
253	!
254	!-- Horizontal grid size or number of processors differs between
255	!-- ocean and atmosphere
256	ELSE
257
258	!
259	!-- Send heat flux at bottom surface to the ocean
260	total_2d_a = 0.0_wp
261	total_2d = 0.0_wp
262	!
263	!-- Transfer from 1D surface type to 2D grid.
264	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%shf, surf_lsm_h%shf, &
265	surf_usm_h%shf )
266
267	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
268	comm2d, ierr )
269	CALL interpolate_to_ocean( 12 )
270	!
271	!-- Send humidity flux at bottom surface to the ocean
272	IF ( humidity ) THEN
273	total_2d_a = 0.0_wp
274	total_2d = 0.0_wp
275	!
276	!-- Transfer from 1D surface type to 2D grid.
277	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%qsws, &
278	surf_lsm_h%qsws, &
279	surf_usm_h%qsws )
280
281	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
282	0, comm2d, ierr )
283	CALL interpolate_to_ocean( 13 )
284	ENDIF
285	!
286	!-- Receive temperature at the bottom surface from the ocean
287	IF ( myid == 0 ) THEN
288	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
289	target_id, 14, comm_inter, status, ierr )
290	ENDIF
291	CALL MPI_BARRIER( comm2d, ierr )
292	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
293	ierr )
294	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
295	!
296	!-- Send momentum flux (u) at bottom surface to the ocean
297	total_2d_a = 0.0_wp
298	total_2d = 0.0_wp
299	!
300	!-- Transfer from 1D surface type to 2D grid.
301	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%usws, surf_lsm_h%usws, &
302	surf_usm_h%usws )
303	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
304	comm2d, ierr )
305	CALL interpolate_to_ocean( 15 )
306	!
307	!-- Send momentum flux (v) at bottom surface to the ocean
308	total_2d_a = 0.0_wp
309	total_2d = 0.0_wp
310	!
311	!-- Transfer from 1D surface type to 2D grid.
312	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%usws, surf_lsm_h%usws, &
313	surf_usm_h%usws )
314	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
315	comm2d, ierr )
316	CALL interpolate_to_ocean( 16 )
317	!
318	!-- Receive u at the bottom surface from the ocean
319	IF ( myid == 0 ) THEN
320	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
321	target_id, 17, comm_inter, status, ierr )
322	ENDIF
323	CALL MPI_BARRIER( comm2d, ierr )
324	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
325	ierr )
326	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
327	!
328	!-- Receive v at the bottom surface from the ocean
329	IF ( myid == 0 ) THEN
330	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
331	target_id, 18, comm_inter, status, ierr )
332	ENDIF
333	CALL MPI_BARRIER( comm2d, ierr )
334	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
335	ierr )
336	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
337
338	ENDIF
339
340	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
341
342	!
343	!-- Horizontal grid size and number of processors is equal
344	!-- in ocean and atmosphere
345	IF ( coupling_topology == 0 ) THEN
346	!
347	!-- Receive heat flux at the sea surface (top) from the atmosphere
348	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
349	comm_inter, status, ierr )
350	CALL transfer_2D_to_1D_equal( surf_def_h(2)%shf )
351	!
352	!-- Receive humidity flux from the atmosphere (bottom)
353	!-- and add it to the heat flux at the sea surface (top)...
354	IF ( humidity_remote ) THEN
355	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, &
356	target_id, 13, comm_inter, status, ierr )
357	CALL transfer_2D_to_1D_equal( surf_def_h(2)%qsws )
358	ENDIF
359	!
360	!-- Send sea surface temperature to the atmosphere model
361	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
362	comm_inter, ierr )
363	!
364	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
365	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
366	comm_inter, status, ierr )
367	CALL transfer_2D_to_1D_equal( surf_def_h(2)%usws )
368	!
369	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
370	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
371	comm_inter, status, ierr )
372	CALL transfer_2D_to_1D_equal( surf_def_h(2)%vsws )
373	!
374	!-- Send u to the atmosphere
375	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
376	comm_inter, ierr )
377	!
378	!-- Send v to the atmosphere
379	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
380	comm_inter, ierr )
381	!
382	!-- Horizontal gridsize or number of processors differs between
383	!-- ocean and atmosphere
384	ELSE
385	!
386	!-- Receive heat flux at the sea surface (top) from the atmosphere
387	IF ( myid == 0 ) THEN
388	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
389	target_id, 12, comm_inter, status, ierr )
390	ENDIF
391	CALL MPI_BARRIER( comm2d, ierr )
392	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
393	ierr )
394	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%shf )
395	!
396	!-- Receive humidity flux at the sea surface (top) from the atmosphere
397	IF ( humidity_remote ) THEN
398	IF ( myid == 0 ) THEN
399	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
400	target_id, 13, comm_inter, status, ierr )
401	ENDIF
402	CALL MPI_BARRIER( comm2d, ierr )
403	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
404	comm2d, ierr)
405	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%qsws )
406	ENDIF
407	!
408	!-- Send surface temperature to atmosphere
409	total_2d_o = 0.0_wp
410	total_2d = 0.0_wp
411	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
412
413	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
414	comm2d, ierr)
415	CALL interpolate_to_atmos( 14 )
416	!
417	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
418	IF ( myid == 0 ) THEN
419	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
420	target_id, 15, comm_inter, status, ierr )
421	ENDIF
422	CALL MPI_BARRIER( comm2d, ierr )
423	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
424	0, comm2d, ierr )
425	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%usws )
426	!
427	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
428	IF ( myid == 0 ) THEN
429	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
430	target_id, 16, comm_inter, status, ierr )
431	ENDIF
432	CALL MPI_BARRIER( comm2d, ierr )
433	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
434	ierr )
435	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%vsws )
436	!
437	!-- Send u to atmosphere
438	total_2d_o = 0.0_wp
439	total_2d = 0.0_wp
440	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
441	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
442	comm2d, ierr )
443	CALL interpolate_to_atmos( 17 )
444	!
445	!-- Send v to atmosphere
446	total_2d_o = 0.0_wp
447	total_2d = 0.0_wp
448	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
449	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
450	comm2d, ierr )
451	CALL interpolate_to_atmos( 18 )
452
453	ENDIF
454
455	!
456	!-- Conversions of fluxes received from atmosphere
457	IF ( humidity_remote ) THEN
458	!
459	!-- Here top heat flux is still the sum of atmospheric bottom heat fluxes,
460	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
461	!-- /(rho_atm(=1.0)*c_p)
462	DO m = 1, surf_def_h(2)%ns
463	i = surf_def_h(2)%i(m)
464	j = surf_def_h(2)%j(m)
465
466	surf_def_h(2)%shf(m) = surf_def_h(2)%shf(m) + &
467	surf_def_h(2)%qsws(m) * l_v / cp
468	!
469	!-- ...and convert it to a salinity flux at the sea surface (top)
470	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
471	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
472	surf_def_h(2)%sasws(m) = -1.0_wp * sa(nzt,j,i) * 0.001_wp * &
473	surf_def_h(2)%qsws(m) / &
474	( rho_ocean(nzt,j,i) * &
475	( 1.0_wp - sa(nzt,j,i) * 0.001_wp ) &
476	)
477	ENDDO
478	ENDIF
479
480	!
481	!-- Adjust the kinematic heat flux with respect to ocean density
482	!-- (constants are the specific heat capacities for air and water), as well
483	!-- as momentum fluxes
484	DO m = 1, surf_def_h(2)%ns
485	i = surf_def_h(2)%i(m)
486	j = surf_def_h(2)%j(m)
487	surf_def_h(2)%shf(m) = surf_def_h(2)%shf(m) / rho_ocean(nzt,j,i) * &
488	cp / cpw
489
490	surf_def_h(2)%usws(m) = surf_def_h(2)%usws(m) / rho_ocean(nzt,j,i)
491	surf_def_h(2)%vsws(m) = surf_def_h(2)%vsws(m) / rho_ocean(nzt,j,i)
492	ENDDO
493
494	ENDIF
495
496	IF ( coupling_topology == 1 ) THEN
497	DEALLOCATE( total_2d_o, total_2d_a )
498	ENDIF
499
500	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
501
502	#endif
503
504	CONTAINS
505
506	! Description:
507	!------------------------------------------------------------------------------!
508	!> Data transfer from 1D surface-data type to 2D dummy array for equal
509	!> grids in atmosphere and ocean.
510	!------------------------------------------------------------------------------!
511	SUBROUTINE transfer_1D_to_2D_equal( def_1d, lsm_1d, usm_1d )
512
513	IMPLICIT NONE
514
515	INTEGER(iwp) :: i !< running index x
516	INTEGER(iwp) :: j !< running index y
517	INTEGER(iwp) :: m !< running index surface type
518
519	REAL(wp), DIMENSION(1:surf_def_h(0)%ns) :: def_1d !< 1D surface flux, default surfaces
520	REAL(wp), DIMENSION(1:surf_lsm_h%ns) :: lsm_1d !< 1D surface flux, natural surfaces
521	REAL(wp), DIMENSION(1:surf_usm_h%ns) :: usm_1d !< 1D surface flux, urban surfaces
522	!
523	!-- Transfer surface flux at default surfaces to 2D grid
524	DO m = 1, surf_def_h(0)%ns
525	i = surf_def_h(0)%i(m)
526	j = surf_def_h(0)%j(m)
527	surface_flux(j,i) = def_1d(m)
528	ENDDO
529	!
530	!-- Transfer surface flux at natural surfaces to 2D grid
531	IF ( land_surface ) THEN
532	DO m = 1, SIZE(lsm_1d)
533	i = surf_lsm_h%i(m)
534	j = surf_lsm_h%j(m)
535	surface_flux(j,i) = lsm_1d(m)
536	ENDDO
537	ENDIF
538	!
539	!-- Transfer surface flux at natural surfaces to 2D grid
540	IF ( urban_surface ) THEN
541	DO m = 1, SIZE(usm_1d)
542	i = surf_usm_h%i(m)
543	j = surf_usm_h%j(m)
544	surface_flux(j,i) = usm_1d(m)
545	ENDDO
546	ENDIF
547
548	END SUBROUTINE transfer_1D_to_2D_equal
549
550	! Description:
551	!------------------------------------------------------------------------------!
552	!> Data transfer from 2D array for equal grids onto 1D surface-data type
553	!> array.
554	!------------------------------------------------------------------------------!
555	SUBROUTINE transfer_2D_to_1D_equal( def_1d )
556
557	IMPLICIT NONE
558
559	INTEGER(iwp) :: i !< running index x
560	INTEGER(iwp) :: j !< running index y
561	INTEGER(iwp) :: m !< running index surface type
562
563	REAL(wp), DIMENSION(1:surf_def_h(2)%ns) :: def_1d !< 1D surface flux, default surfaces
564	!
565	!-- Transfer surface flux to 1D surface type, only for default surfaces
566	DO m = 1, surf_def_h(2)%ns
567	i = surf_def_h(2)%i(m)
568	j = surf_def_h(2)%j(m)
569	def_1d(m) = surface_flux(j,i)
570	ENDDO
571
572	END SUBROUTINE transfer_2D_to_1D_equal
573
574	! Description:
575	!------------------------------------------------------------------------------!
576	!> Data transfer from 1D surface-data type to 2D dummy array from unequal
577	!> grids in atmosphere and ocean.
578	!------------------------------------------------------------------------------!
579	SUBROUTINE transfer_1D_to_2D_unequal( def_1d, lsm_1d, usm_1d )
580
581	IMPLICIT NONE
582
583	INTEGER(iwp) :: i !< running index x
584	INTEGER(iwp) :: j !< running index y
585	INTEGER(iwp) :: m !< running index surface type
586
587	REAL(wp), DIMENSION(1:surf_def_h(0)%ns) :: def_1d !< 1D surface flux, default surfaces
588	REAL(wp), DIMENSION(1:surf_lsm_h%ns) :: lsm_1d !< 1D surface flux, natural surfaces
589	REAL(wp), DIMENSION(1:surf_usm_h%ns) :: usm_1d !< 1D surface flux, urban surfaces
590	!
591	!-- Transfer surface flux at default surfaces to 2D grid. Transfer no
592	!-- ghost-grid points since total_2d is a global array.
593	DO m = 1, SIZE(def_1d)
594	i = surf_def_h(0)%i(m)
595	j = surf_def_h(0)%j(m)
596
597	IF ( i >= nxl .AND. i <= nxr .AND. &
598	j >= nys .AND. j <= nyn ) THEN
599	total_2d(j,i) = def_1d(m)
600	ENDIF
601	ENDDO
602	!
603	!-- Transfer surface flux at natural surfaces to 2D grid
604	IF ( land_surface ) THEN
605	DO m = 1, SIZE(lsm_1d)
606	i = surf_lsm_h%i(m)
607	j = surf_lsm_h%j(m)
608
609	IF ( i >= nxl .AND. i <= nxr .AND. &
610	j >= nys .AND. j <= nyn ) THEN
611	total_2d(j,i) = lsm_1d(m)
612	ENDIF
613	ENDDO
614	ENDIF
615	!
616	!-- Transfer surface flux at natural surfaces to 2D grid
617	IF ( urban_surface ) THEN
618	DO m = 1, SIZE(usm_1d)
619	i = surf_usm_h%i(m)
620	j = surf_usm_h%j(m)
621
622	IF ( i >= nxl .AND. i <= nxr .AND. &
623	j >= nys .AND. j <= nyn ) THEN
624	total_2d(j,i) = usm_1d(m)
625	ENDIF
626	ENDDO
627	ENDIF
628
629	END SUBROUTINE transfer_1D_to_2D_unequal
630
631	! Description:
632	!------------------------------------------------------------------------------!
633	!> Data transfer from 2D dummy array from unequal grids to 1D surface-data
634	!> type.
635	!------------------------------------------------------------------------------!
636	SUBROUTINE transfer_2D_to_1D_unequal( def_1d )
637
638	IMPLICIT NONE
639
640	INTEGER(iwp) :: i !< running index x
641	INTEGER(iwp) :: j !< running index y
642	INTEGER(iwp) :: m !< running index surface type
643
644	REAL(wp), DIMENSION(1:surf_def_h(2)%ns) :: def_1d !< 1D surface flux, default surfaces
645	!
646	!-- Transfer 2D surface flux to default surfaces data type. Transfer no
647	!-- ghost-grid points since total_2d is a global array.
648	DO m = 1, SIZE(def_1d)
649	i = surf_def_h(2)%i(m)
650	j = surf_def_h(2)%j(m)
651
652	IF ( i >= nxl .AND. i <= nxr .AND. &
653	j >= nys .AND. j <= nyn ) THEN
654	def_1d(m) = total_2d_o(j,i)
655	ENDIF
656	ENDDO
657
658
659	END SUBROUTINE transfer_2D_to_1D_unequal
660
661	END SUBROUTINE surface_coupler
662
663
664
665	!------------------------------------------------------------------------------!
666	! Description:
667	! ------------
668	!> @todo Missing subroutine description.
669	!------------------------------------------------------------------------------!
670	SUBROUTINE interpolate_to_atmos( tag )
671
672	#if defined( __parallel )
673
674	USE arrays_3d, &
675	ONLY: total_2d_a, total_2d_o
676
677	USE indices, &
678	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
679
680	USE kinds
681
682	USE pegrid
683
684	IMPLICIT NONE
685
686	INTEGER(iwp) :: dnx !<
687	INTEGER(iwp) :: dnx2 !<
688	INTEGER(iwp) :: dny !<
689	INTEGER(iwp) :: dny2 !<
690	INTEGER(iwp) :: i !<
691	INTEGER(iwp) :: ii !<
692	INTEGER(iwp) :: j !<
693	INTEGER(iwp) :: jj !<
694
695	INTEGER(iwp), intent(in) :: tag !<
696
697	CALL MPI_BARRIER( comm2d, ierr )
698
699	IF ( myid == 0 ) THEN
700	!
701	!-- Cyclic boundary conditions for the total 2D-grid
702	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
703	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
704
705	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
706	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
707
708	!
709	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
710	dnx = (nx_o+1) / (nx_a+1)
711	dny = (ny_o+1) / (ny_a+1)
712
713	!
714	!-- Distance for interpolation around coarse grid points within the fine
715	!-- grid (note: 2*dnx2 must not be equal with dnx)
716	dnx2 = 2 * ( dnx / 2 )
717	dny2 = 2 * ( dny / 2 )
718
719	total_2d_a = 0.0_wp
720	!
721	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
722	DO j = 0, ny_a
723	DO i = 0, nx_a
724	DO jj = 0, dny2
725	DO ii = 0, dnx2
726	total_2d_a(j,i) = total_2d_a(j,i) &
727	+ total_2d_o(jdny+jj,idnx+ii)
728	ENDDO
729	ENDDO
730	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
731	ENDDO
732	ENDDO
733	!
734	!-- Cyclic boundary conditions for atmosphere grid
735	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
736	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
737
738	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
739	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
740	!
741	!-- Transfer of the atmosphere-grid-layer to the atmosphere
742	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
743	tag, comm_inter, ierr )
744
745	ENDIF
746
747	CALL MPI_BARRIER( comm2d, ierr )
748
749	#endif
750
751	END SUBROUTINE interpolate_to_atmos
752
753
754	!------------------------------------------------------------------------------!
755	! Description:
756	! ------------
757	!> @todo Missing subroutine description.
758	!------------------------------------------------------------------------------!
759	SUBROUTINE interpolate_to_ocean( tag )
760
761	#if defined( __parallel )
762
763	USE arrays_3d, &
764	ONLY: total_2d_a, total_2d_o
765
766	USE indices, &
767	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
768
769	USE kinds
770
771	USE pegrid
772
773	IMPLICIT NONE
774
775	INTEGER(iwp) :: dnx !<
776	INTEGER(iwp) :: dny !<
777	INTEGER(iwp) :: i !<
778	INTEGER(iwp) :: ii !<
779	INTEGER(iwp) :: j !<
780	INTEGER(iwp) :: jj !<
781	INTEGER(iwp), intent(in) :: tag !<
782
783	REAL(wp) :: fl !<
784	REAL(wp) :: fr !<
785	REAL(wp) :: myl !<
786	REAL(wp) :: myr !<
787
788	CALL MPI_BARRIER( comm2d, ierr )
789
790	IF ( myid == 0 ) THEN
791
792	!
793	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
794	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
795	dny = ( ny_o + 1 ) / ( ny_a + 1 )
796
797	!
798	!-- Cyclic boundary conditions for atmosphere grid
799	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
800	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
801
802	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
803	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
804	!
805	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
806	DO j = 0, ny
807	DO i = 0, nx
808	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
809	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
810	DO jj = 0, dny-1
811	fl = myl*jj + total_2d_a(j,i)
812	fr = myr*jj + total_2d_a(j,i+1)
813	DO ii = 0, dnx-1
814	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
815	ENDDO
816	ENDDO
817	ENDDO
818	ENDDO
819	!
820	!-- Cyclic boundary conditions for ocean grid
821	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
822	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
823
824	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
825	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
826
827	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
828	target_id, tag, comm_inter, ierr )
829
830	ENDIF
831
832	CALL MPI_BARRIER( comm2d, ierr )
833
834	#endif
835
836	END SUBROUTINE interpolate_to_ocean

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