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source: palm/trunk/SOURCE/surface_coupler.f90 @ 4445

Last change on this file since 4445 was 4429, checked in by raasch, 5 years ago
serial (non-MPI) test case added, several bugfixes for the serial mode
Property svn:keywords set to `Id`
File size: 30.4 KB

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1	!> @file surface_coupler.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
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 1997-2020 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: surface_coupler.f90 4429 2020-02-27 15:24:30Z raasch $
27	! bugfix: preprocessor directives rearranged for serial mode
28	!
29	! 4360 2020-01-07 11:25:50Z suehring
30	! Corrected "Former revisions" section
31	!
32	! 3655 2019-01-07 16:51:22Z knoop
33	! Modularization of all bulk cloud physics code components
34	!
35	! 109 2007-08-28 15:26:47Z letzel
36	! Initial revision
37	!
38	! Description:
39	! ------------
40	!> Data exchange at the interface between coupled models
41	!------------------------------------------------------------------------------!
42	SUBROUTINE surface_coupler
43	#if defined( __parallel )
44
45
46	USE arrays_3d, &
47	ONLY: pt, rho_ocean, sa, total_2d_a, total_2d_o, u, v
48
49	USE basic_constants_and_equations_mod, &
50	ONLY: c_p, l_v
51
52	USE control_parameters, &
53	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
54	humidity, humidity_remote, land_surface, message_string, &
55	terminate_coupled, terminate_coupled_remote, &
56	time_since_reference_point, urban_surface
57
58	USE cpulog, &
59	ONLY: cpu_log, log_point
60
61	USE indices, &
62	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
63	nysg, ny_a, ny_o, nzt
64
65	USE kinds
66
67	USE pegrid
68
69	USE surface_mod, &
70	ONLY : surf_def_h, surf_lsm_h, surf_type, surf_usm_h
71
72	IMPLICIT NONE
73
74	INTEGER(iwp) :: i !< index variable x-direction
75	INTEGER(iwp) :: j !< index variable y-direction
76	INTEGER(iwp) :: m !< running index for surface elements
77
78	REAL(wp) :: cpw = 4218.0_wp !< heat capacity of water at constant pressure
79	REAL(wp) :: time_since_reference_point_rem !<
80	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
81
82	REAL(wp), DIMENSION(nysg:nyng,nxlg:nxrg) :: surface_flux !< dummy array for surface fluxes on 2D grid
83
84
85	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
86
87
88
89	!
90	!-- In case of model termination initiated by the remote model
91	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
92	!-- The rest of the coupler must then be skipped because it would cause an MPI
93	!-- intercomminucation hang.
94	!-- If necessary, the coupler will be called at the beginning of the next
95	!-- restart run.
96
97	IF ( coupling_topology == 0 ) THEN
98	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
99	0, &
100	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
101	0, comm_inter, status, ierr )
102	ELSE
103	IF ( myid == 0) THEN
104	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
105	target_id, 0, &
106	terminate_coupled_remote, 1, MPI_INTEGER, &
107	target_id, 0, &
108	comm_inter, status, ierr )
109	ENDIF
110	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
111	ierr )
112
113	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
114	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
115
116	ENDIF
117
118	IF ( terminate_coupled_remote > 0 ) THEN
119	WRITE( message_string, * ) 'remote model "', &
120	TRIM( coupling_mode_remote ), &
121	'" terminated', &
122	'&with terminate_coupled_remote = ', &
123	terminate_coupled_remote, &
124	'&local model "', TRIM( coupling_mode ), &
125	'" has', &
126	'&terminate_coupled = ', &
127	terminate_coupled
128	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
129	RETURN
130	ENDIF
131
132
133	!
134	!-- Exchange the current simulated time between the models,
135	!-- currently just for total_2d
136	IF ( coupling_topology == 0 ) THEN
137
138	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
139	comm_inter, ierr )
140	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
141	11, comm_inter, status, ierr )
142	ELSE
143
144	IF ( myid == 0 ) THEN
145
146	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
147	11, comm_inter, ierr )
148	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
149	target_id, 11, comm_inter, status, ierr )
150
151	ENDIF
152
153	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
154	ierr )
155
156	ENDIF
157
158	!
159	!-- Exchange the interface data
160	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
161
162	!
163	!-- Horizontal grid size and number of processors is equal in ocean and
164	!-- atmosphere
165	IF ( coupling_topology == 0 ) THEN
166
167	!
168	!-- Send heat flux at bottom surface to the ocean. First, transfer from
169	!-- 1D surface type to 2D grid.
170	CALL transfer_1D_to_2D_equal( surf_def_h(0)%shf, surf_lsm_h%shf, &
171	surf_usm_h%shf )
172	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, &
173	12, comm_inter, ierr )
174	!
175	!-- Send humidity flux at bottom surface to the ocean. First, transfer
176	!-- from 1D surface type to 2D grid.
177	CALL transfer_1D_to_2D_equal( surf_def_h(0)%qsws, surf_lsm_h%qsws, &
178	surf_usm_h%qsws )
179	IF ( humidity ) THEN
180	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, &
181	target_id, 13, comm_inter, ierr )
182	ENDIF
183	!
184	!-- Receive temperature at the bottom surface from the ocean
185	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
186	comm_inter, status, ierr )
187	!
188	!-- Send the momentum flux (u) at bottom surface to the ocean. First,
189	!-- transfer from 1D surface type to 2D grid.
190	CALL transfer_1D_to_2D_equal( surf_def_h(0)%usws, surf_lsm_h%usws, &
191	surf_usm_h%usws )
192	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, &
193	15, comm_inter, ierr )
194	!
195	!-- Send the momentum flux (v) at bottom surface to the ocean. First,
196	!-- transfer from 1D surface type to 2D grid.
197	CALL transfer_1D_to_2D_equal( surf_def_h(0)%vsws, surf_lsm_h%vsws, &
198	surf_usm_h%vsws )
199	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, &
200	16, comm_inter, ierr )
201	!
202	!-- Receive u at the bottom surface from the ocean
203	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
204	comm_inter, status, ierr )
205	!
206	!-- Receive v at the bottom surface from the ocean
207	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
208	comm_inter, status, ierr )
209	!
210	!-- Horizontal grid size or number of processors differs between
211	!-- ocean and atmosphere
212	ELSE
213
214	!
215	!-- Send heat flux at bottom surface to the ocean
216	total_2d_a = 0.0_wp
217	total_2d = 0.0_wp
218	!
219	!-- Transfer from 1D surface type to 2D grid.
220	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%shf, surf_lsm_h%shf, &
221	surf_usm_h%shf )
222
223	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
224	comm2d, ierr )
225	CALL interpolate_to_ocean( 12 )
226	!
227	!-- Send humidity flux at bottom surface to the ocean
228	IF ( humidity ) THEN
229	total_2d_a = 0.0_wp
230	total_2d = 0.0_wp
231	!
232	!-- Transfer from 1D surface type to 2D grid.
233	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%qsws, &
234	surf_lsm_h%qsws, &
235	surf_usm_h%qsws )
236
237	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
238	0, comm2d, ierr )
239	CALL interpolate_to_ocean( 13 )
240	ENDIF
241	!
242	!-- Receive temperature at the bottom surface from the ocean
243	IF ( myid == 0 ) THEN
244	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
245	target_id, 14, comm_inter, status, ierr )
246	ENDIF
247	CALL MPI_BARRIER( comm2d, ierr )
248	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
249	ierr )
250	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
251	!
252	!-- Send momentum flux (u) at bottom surface to the ocean
253	total_2d_a = 0.0_wp
254	total_2d = 0.0_wp
255	!
256	!-- Transfer from 1D surface type to 2D grid.
257	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%usws, surf_lsm_h%usws, &
258	surf_usm_h%usws )
259	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
260	comm2d, ierr )
261	CALL interpolate_to_ocean( 15 )
262	!
263	!-- Send momentum flux (v) at bottom surface to the ocean
264	total_2d_a = 0.0_wp
265	total_2d = 0.0_wp
266	!
267	!-- Transfer from 1D surface type to 2D grid.
268	CALL transfer_1D_to_2D_unequal( surf_def_h(0)%usws, surf_lsm_h%usws, &
269	surf_usm_h%usws )
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( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
305	comm_inter, status, ierr )
306	CALL transfer_2D_to_1D_equal( surf_def_h(2)%shf )
307	!
308	!-- Receive humidity flux from the atmosphere (bottom)
309	!-- and add it to the heat flux at the sea surface (top)...
310	IF ( humidity_remote ) THEN
311	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, &
312	target_id, 13, comm_inter, status, ierr )
313	CALL transfer_2D_to_1D_equal( surf_def_h(2)%qsws )
314	ENDIF
315	!
316	!-- Send sea surface temperature to the atmosphere model
317	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
318	comm_inter, ierr )
319	!
320	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
321	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
322	comm_inter, status, ierr )
323	CALL transfer_2D_to_1D_equal( surf_def_h(2)%usws )
324	!
325	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
326	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
327	comm_inter, status, ierr )
328	CALL transfer_2D_to_1D_equal( surf_def_h(2)%vsws )
329	!
330	!-- Send u to the atmosphere
331	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
332	comm_inter, ierr )
333	!
334	!-- Send v to the atmosphere
335	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
336	comm_inter, ierr )
337	!
338	!-- Horizontal gridsize or number of processors differs between
339	!-- ocean and atmosphere
340	ELSE
341	!
342	!-- Receive heat flux at the sea surface (top) from the atmosphere
343	IF ( myid == 0 ) THEN
344	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
345	target_id, 12, comm_inter, status, ierr )
346	ENDIF
347	CALL MPI_BARRIER( comm2d, ierr )
348	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
349	ierr )
350	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%shf )
351	!
352	!-- Receive humidity flux at the sea surface (top) from the atmosphere
353	IF ( humidity_remote ) THEN
354	IF ( myid == 0 ) THEN
355	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
356	target_id, 13, comm_inter, status, ierr )
357	ENDIF
358	CALL MPI_BARRIER( comm2d, ierr )
359	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
360	comm2d, ierr)
361	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%qsws )
362	ENDIF
363	!
364	!-- Send surface temperature to atmosphere
365	total_2d_o = 0.0_wp
366	total_2d = 0.0_wp
367	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
368
369	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
370	comm2d, ierr)
371	CALL interpolate_to_atmos( 14 )
372	!
373	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
374	IF ( myid == 0 ) THEN
375	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
376	target_id, 15, comm_inter, status, ierr )
377	ENDIF
378	CALL MPI_BARRIER( comm2d, ierr )
379	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
380	0, comm2d, ierr )
381	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%usws )
382	!
383	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
384	IF ( myid == 0 ) THEN
385	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
386	target_id, 16, comm_inter, status, ierr )
387	ENDIF
388	CALL MPI_BARRIER( comm2d, ierr )
389	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
390	ierr )
391	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%vsws )
392	!
393	!-- Send u to atmosphere
394	total_2d_o = 0.0_wp
395	total_2d = 0.0_wp
396	total_2d(nys:nyn,nxl:nxr) = u(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( 17 )
400	!
401	!-- Send v to atmosphere
402	total_2d_o = 0.0_wp
403	total_2d = 0.0_wp
404	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
405	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
406	comm2d, ierr )
407	CALL interpolate_to_atmos( 18 )
408
409	ENDIF
410
411	!
412	!-- Conversions of fluxes received from atmosphere
413	IF ( humidity_remote ) THEN
414	!
415	!-- Here top heat flux is still the sum of atmospheric bottom heat fluxes,
416	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
417	!-- /(rho_atm(=1.0)*c_p)
418	DO m = 1, surf_def_h(2)%ns
419	i = surf_def_h(2)%i(m)
420	j = surf_def_h(2)%j(m)
421
422	surf_def_h(2)%shf(m) = surf_def_h(2)%shf(m) + &
423	surf_def_h(2)%qsws(m) * l_v / c_p
424	!
425	!-- ...and convert it to a salinity flux at the sea surface (top)
426	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
427	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
428	surf_def_h(2)%sasws(m) = -1.0_wp * sa(nzt,j,i) * 0.001_wp * &
429	surf_def_h(2)%qsws(m) / &
430	( rho_ocean(nzt,j,i) * &
431	( 1.0_wp - sa(nzt,j,i) * 0.001_wp ) &
432	)
433	ENDDO
434	ENDIF
435
436	!
437	!-- Adjust the kinematic heat flux with respect to ocean density
438	!-- (constants are the specific heat capacities for air and water), as well
439	!-- as momentum fluxes
440	DO m = 1, surf_def_h(2)%ns
441	i = surf_def_h(2)%i(m)
442	j = surf_def_h(2)%j(m)
443	surf_def_h(2)%shf(m) = surf_def_h(2)%shf(m) / rho_ocean(nzt,j,i) * &
444	c_p / cpw
445
446	surf_def_h(2)%usws(m) = surf_def_h(2)%usws(m) / rho_ocean(nzt,j,i)
447	surf_def_h(2)%vsws(m) = surf_def_h(2)%vsws(m) / rho_ocean(nzt,j,i)
448	ENDDO
449
450	ENDIF
451
452	IF ( coupling_topology == 1 ) THEN
453	DEALLOCATE( total_2d_o, total_2d_a )
454	ENDIF
455
456	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
457
458
459	CONTAINS
460
461	! Description:
462	!------------------------------------------------------------------------------!
463	!> Data transfer from 1D surface-data type to 2D dummy array for equal
464	!> grids in atmosphere and ocean.
465	!------------------------------------------------------------------------------!
466	SUBROUTINE transfer_1D_to_2D_equal( def_1d, lsm_1d, usm_1d )
467
468	IMPLICIT NONE
469
470	INTEGER(iwp) :: i !< running index x
471	INTEGER(iwp) :: j !< running index y
472	INTEGER(iwp) :: m !< running index surface type
473
474	REAL(wp), DIMENSION(1:surf_def_h(0)%ns) :: def_1d !< 1D surface flux, default surfaces
475	REAL(wp), DIMENSION(1:surf_lsm_h%ns) :: lsm_1d !< 1D surface flux, natural surfaces
476	REAL(wp), DIMENSION(1:surf_usm_h%ns) :: usm_1d !< 1D surface flux, urban surfaces
477	!
478	!-- Transfer surface flux at default surfaces to 2D grid
479	DO m = 1, surf_def_h(0)%ns
480	i = surf_def_h(0)%i(m)
481	j = surf_def_h(0)%j(m)
482	surface_flux(j,i) = def_1d(m)
483	ENDDO
484	!
485	!-- Transfer surface flux at natural surfaces to 2D grid
486	IF ( land_surface ) THEN
487	DO m = 1, SIZE(lsm_1d)
488	i = surf_lsm_h%i(m)
489	j = surf_lsm_h%j(m)
490	surface_flux(j,i) = lsm_1d(m)
491	ENDDO
492	ENDIF
493	!
494	!-- Transfer surface flux at natural surfaces to 2D grid
495	IF ( urban_surface ) THEN
496	DO m = 1, SIZE(usm_1d)
497	i = surf_usm_h%i(m)
498	j = surf_usm_h%j(m)
499	surface_flux(j,i) = usm_1d(m)
500	ENDDO
501	ENDIF
502
503	END SUBROUTINE transfer_1D_to_2D_equal
504
505	! Description:
506	!------------------------------------------------------------------------------!
507	!> Data transfer from 2D array for equal grids onto 1D surface-data type
508	!> array.
509	!------------------------------------------------------------------------------!
510	SUBROUTINE transfer_2D_to_1D_equal( def_1d )
511
512	IMPLICIT NONE
513
514	INTEGER(iwp) :: i !< running index x
515	INTEGER(iwp) :: j !< running index y
516	INTEGER(iwp) :: m !< running index surface type
517
518	REAL(wp), DIMENSION(1:surf_def_h(2)%ns) :: def_1d !< 1D surface flux, default surfaces
519	!
520	!-- Transfer surface flux to 1D surface type, only for default surfaces
521	DO m = 1, surf_def_h(2)%ns
522	i = surf_def_h(2)%i(m)
523	j = surf_def_h(2)%j(m)
524	def_1d(m) = surface_flux(j,i)
525	ENDDO
526
527	END SUBROUTINE transfer_2D_to_1D_equal
528
529	! Description:
530	!------------------------------------------------------------------------------!
531	!> Data transfer from 1D surface-data type to 2D dummy array from unequal
532	!> grids in atmosphere and ocean.
533	!------------------------------------------------------------------------------!
534	SUBROUTINE transfer_1D_to_2D_unequal( def_1d, lsm_1d, usm_1d )
535
536	IMPLICIT NONE
537
538	INTEGER(iwp) :: i !< running index x
539	INTEGER(iwp) :: j !< running index y
540	INTEGER(iwp) :: m !< running index surface type
541
542	REAL(wp), DIMENSION(1:surf_def_h(0)%ns) :: def_1d !< 1D surface flux, default surfaces
543	REAL(wp), DIMENSION(1:surf_lsm_h%ns) :: lsm_1d !< 1D surface flux, natural surfaces
544	REAL(wp), DIMENSION(1:surf_usm_h%ns) :: usm_1d !< 1D surface flux, urban surfaces
545	!
546	!-- Transfer surface flux at default surfaces to 2D grid. Transfer no
547	!-- ghost-grid points since total_2d is a global array.
548	DO m = 1, SIZE(def_1d)
549	i = surf_def_h(0)%i(m)
550	j = surf_def_h(0)%j(m)
551
552	IF ( i >= nxl .AND. i <= nxr .AND. &
553	j >= nys .AND. j <= nyn ) THEN
554	total_2d(j,i) = def_1d(m)
555	ENDIF
556	ENDDO
557	!
558	!-- Transfer surface flux at natural surfaces to 2D grid
559	IF ( land_surface ) THEN
560	DO m = 1, SIZE(lsm_1d)
561	i = surf_lsm_h%i(m)
562	j = surf_lsm_h%j(m)
563
564	IF ( i >= nxl .AND. i <= nxr .AND. &
565	j >= nys .AND. j <= nyn ) THEN
566	total_2d(j,i) = lsm_1d(m)
567	ENDIF
568	ENDDO
569	ENDIF
570	!
571	!-- Transfer surface flux at natural surfaces to 2D grid
572	IF ( urban_surface ) THEN
573	DO m = 1, SIZE(usm_1d)
574	i = surf_usm_h%i(m)
575	j = surf_usm_h%j(m)
576
577	IF ( i >= nxl .AND. i <= nxr .AND. &
578	j >= nys .AND. j <= nyn ) THEN
579	total_2d(j,i) = usm_1d(m)
580	ENDIF
581	ENDDO
582	ENDIF
583
584	END SUBROUTINE transfer_1D_to_2D_unequal
585
586	! Description:
587	!------------------------------------------------------------------------------!
588	!> Data transfer from 2D dummy array from unequal grids to 1D surface-data
589	!> type.
590	!------------------------------------------------------------------------------!
591	SUBROUTINE transfer_2D_to_1D_unequal( def_1d )
592
593	IMPLICIT NONE
594
595	INTEGER(iwp) :: i !< running index x
596	INTEGER(iwp) :: j !< running index y
597	INTEGER(iwp) :: m !< running index surface type
598
599	REAL(wp), DIMENSION(1:surf_def_h(2)%ns) :: def_1d !< 1D surface flux, default surfaces
600	!
601	!-- Transfer 2D surface flux to default surfaces data type. Transfer no
602	!-- ghost-grid points since total_2d is a global array.
603	DO m = 1, SIZE(def_1d)
604	i = surf_def_h(2)%i(m)
605	j = surf_def_h(2)%j(m)
606
607	IF ( i >= nxl .AND. i <= nxr .AND. &
608	j >= nys .AND. j <= nyn ) THEN
609	def_1d(m) = total_2d_o(j,i)
610	ENDIF
611	ENDDO
612
613
614	END SUBROUTINE transfer_2D_to_1D_unequal
615
616	#endif
617	END SUBROUTINE surface_coupler
618
619
620
621	!------------------------------------------------------------------------------!
622	! Description:
623	! ------------
624	!> @todo Missing subroutine description.
625	!------------------------------------------------------------------------------!
626	#if defined( __parallel )
627
628	SUBROUTINE interpolate_to_atmos( tag )
629
630	USE arrays_3d, &
631	ONLY: total_2d_a, total_2d_o
632
633	USE indices, &
634	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
635
636	USE kinds
637
638	USE pegrid
639
640	IMPLICIT NONE
641
642	INTEGER(iwp) :: dnx !<
643	INTEGER(iwp) :: dnx2 !<
644	INTEGER(iwp) :: dny !<
645	INTEGER(iwp) :: dny2 !<
646	INTEGER(iwp) :: i !<
647	INTEGER(iwp) :: ii !<
648	INTEGER(iwp) :: j !<
649	INTEGER(iwp) :: jj !<
650
651	INTEGER(iwp), intent(in) :: tag !<
652
653	CALL MPI_BARRIER( comm2d, ierr )
654
655	IF ( myid == 0 ) THEN
656	!
657	!-- Cyclic boundary conditions for the total 2D-grid
658	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
659	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
660
661	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
662	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
663
664	!
665	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
666	dnx = (nx_o+1) / (nx_a+1)
667	dny = (ny_o+1) / (ny_a+1)
668
669	!
670	!-- Distance for interpolation around coarse grid points within the fine
671	!-- grid (note: 2*dnx2 must not be equal with dnx)
672	dnx2 = 2 * ( dnx / 2 )
673	dny2 = 2 * ( dny / 2 )
674
675	total_2d_a = 0.0_wp
676	!
677	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
678	DO j = 0, ny_a
679	DO i = 0, nx_a
680	DO jj = 0, dny2
681	DO ii = 0, dnx2
682	total_2d_a(j,i) = total_2d_a(j,i) &
683	+ total_2d_o(jdny+jj,idnx+ii)
684	ENDDO
685	ENDDO
686	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
687	ENDDO
688	ENDDO
689	!
690	!-- Cyclic boundary conditions for atmosphere grid
691	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
692	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
693
694	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
695	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
696	!
697	!-- Transfer of the atmosphere-grid-layer to the atmosphere
698	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
699	tag, comm_inter, ierr )
700
701	ENDIF
702
703	CALL MPI_BARRIER( comm2d, ierr )
704
705	END SUBROUTINE interpolate_to_atmos
706
707	#endif
708
709
710	!------------------------------------------------------------------------------!
711	! Description:
712	! ------------
713	!> @todo Missing subroutine description.
714	!------------------------------------------------------------------------------!
715	#if defined( __parallel )
716
717	SUBROUTINE interpolate_to_ocean( tag )
718
719	USE arrays_3d, &
720	ONLY: total_2d_a, total_2d_o
721
722	USE indices, &
723	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
724
725	USE kinds
726
727	USE pegrid
728
729	IMPLICIT NONE
730
731	INTEGER(iwp) :: dnx !<
732	INTEGER(iwp) :: dny !<
733	INTEGER(iwp) :: i !<
734	INTEGER(iwp) :: ii !<
735	INTEGER(iwp) :: j !<
736	INTEGER(iwp) :: jj !<
737	INTEGER(iwp), intent(in) :: tag !<
738
739	REAL(wp) :: fl !<
740	REAL(wp) :: fr !<
741	REAL(wp) :: myl !<
742	REAL(wp) :: myr !<
743
744	CALL MPI_BARRIER( comm2d, ierr )
745
746	IF ( myid == 0 ) THEN
747
748	!
749	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
750	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
751	dny = ( ny_o + 1 ) / ( ny_a + 1 )
752
753	!
754	!-- Cyclic boundary conditions for atmosphere grid
755	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
756	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
757
758	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
759	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
760	!
761	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
762	DO j = 0, ny
763	DO i = 0, nx
764	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
765	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
766	DO jj = 0, dny-1
767	fl = myl*jj + total_2d_a(j,i)
768	fr = myr*jj + total_2d_a(j,i+1)
769	DO ii = 0, dnx-1
770	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
771	ENDDO
772	ENDDO
773	ENDDO
774	ENDDO
775	!
776	!-- Cyclic boundary conditions for ocean grid
777	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
778	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
779
780	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
781	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
782
783	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
784	target_id, tag, comm_inter, ierr )
785
786	ENDIF
787
788	CALL MPI_BARRIER( comm2d, ierr )
789
790	END SUBROUTINE interpolate_to_ocean
791
792	#endif

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