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source: palm/trunk/SOURCE/surface_coupler.f90 @ 2579

Last change on this file since 2579 was 2233, checked in by suehring, 7 years ago
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[1682]	1	!> @file surface_coupler.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	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.
[1036]	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	!
[2101]	17	! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[258]	20	! Current revisions:
[1092]	21	! ------------------
[1321]	22	!
[2233]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: surface_coupler.f90 2233 2017-05-30 18:08:54Z knoop $
	27	!
[2233]	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	!
[2032]	32	! 2031 2016-10-21 15:11:58Z knoop
	33	! renamed variable rho to rho_ocean
	34	!
[2001]	35	! 2000 2016-08-20 18:09:15Z knoop
	36	! Forced header and separation lines into 80 columns
	37	!
[1683]	38	! 1682 2015-10-07 23:56:08Z knoop
	39	! Code annotations made doxygen readable
	40	!
[1428]	41	! 1427 2014-07-07 14:04:59Z maronga
	42	! Bugfix: value of l_v corrected.
	43	!
[1419]	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	!
[1354]	48	! 1353 2014-04-08 15:21:23Z heinze
	49	! REAL constants provided with KIND-attribute
	50	!
[1325]	51	! 1324 2014-03-21 09:13:16Z suehring
	52	! Bugfix: ONLY statement for module pegrid removed
	53	!
[1323]	54	! 1322 2014-03-20 16:38:49Z raasch
	55	! REAL constants defined as wp-kind
	56	!
[1321]	57	! 1320 2014-03-20 08:40:49Z raasch
[1320]	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
[102]	65	!
[1319]	66	! 1318 2014-03-17 13:35:16Z raasch
	67	! module interfaces removed
	68	!
[1093]	69	! 1092 2013-02-02 11:24:22Z raasch
	70	! unused variables removed
	71	!
[1037]	72	! 1036 2012-10-22 13:43:42Z raasch
	73	! code put under GPL (PALM 3.9)
	74	!
[881]	75	! 880 2012-04-13 06:28:59Z raasch
	76	! Bugfix: preprocessor statements for parallel execution added
	77	!
[110]	78	! 109 2007-08-28 15:26:47Z letzel
[102]	79	! Initial revision
	80	!
	81	! Description:
	82	! ------------
[1682]	83	!> Data exchange at the interface between coupled models
[102]	84	!------------------------------------------------------------------------------!
[1682]	85	SUBROUTINE surface_coupler
	86
[102]	87
[1320]	88	USE arrays_3d, &
[2232]	89	ONLY: pt, rho_ocean, sa, total_2d_a, total_2d_o, u, v
[1320]	90
[1427]	91	USE cloud_parameters, &
	92	ONLY: cp, l_v
	93
[1320]	94	USE control_parameters, &
	95	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
[2232]	96	humidity, humidity_remote, land_surface, message_string, &
	97	terminate_coupled, terminate_coupled_remote, &
	98	time_since_reference_point, urban_surface
[1320]	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
[102]	109	USE pegrid
	110
[2232]	111	USE surface_mod, &
	112	ONLY : surf_def_h, surf_lsm_h, surf_type, surf_usm_h
	113
[102]	114	IMPLICIT NONE
	115
[2232]	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
[1682]	121	REAL(wp) :: time_since_reference_point_rem !<
	122	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !<
[102]	123
[2232]	124	REAL(wp), DIMENSION(nysg:nyng,nxlg:nxrg) :: surface_flux !< dummy array for surface fluxes on 2D grid
[1427]	125
[2232]	126
[206]	127	#if defined( __parallel )
[102]	128
[667]	129	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	130
[667]	131
	132
[102]	133	!
[108]	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.
[667]	140
	141	IF ( coupling_topology == 0 ) THEN
[709]	142	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	143	0, &
	144	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
[667]	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
[709]	154	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
	155	ierr )
[667]	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
[108]	162	IF ( terminate_coupled_remote > 0 ) THEN
[274]	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 = ', &
[667]	171	terminate_coupled
[258]	172	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	173	RETURN
	174	ENDIF
[667]	175
[291]	176
[108]	177	!
	178	!-- Exchange the current simulated time between the models,
[2232]	179	!-- currently just for total_2d
[709]	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 )
[667]	186	ELSE
[709]	187
[667]	188	IF ( myid == 0 ) THEN
[709]	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, &
[667]	193	target_id, 11, comm_inter, status, ierr )
[709]	194
[667]	195	ENDIF
[709]	196
	197	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
	198	ierr )
	199
[667]	200	ENDIF
[102]	201
	202	!
	203	!-- Exchange the interface data
	204	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	205
	206	!
[709]	207	!-- Horizontal grid size and number of processors is equal in ocean and
	208	!-- atmosphere
	209	IF ( coupling_topology == 0 ) THEN
[102]	210
	211	!
[2232]	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 )
[102]	218	!
[2232]	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 )
[667]	223	IF ( humidity ) THEN
[2232]	224	CALL MPI_SEND( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, &
	225	target_id, 13, comm_inter, ierr )
[667]	226	ENDIF
	227	!
[709]	228	!-- Receive temperature at the bottom surface from the ocean
[2232]	229	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
[709]	230	comm_inter, status, ierr )
[108]	231	!
[2232]	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 )
[102]	238	!
[2232]	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 )
[102]	245	!
[709]	246	!-- Receive u at the bottom surface from the ocean
[2232]	247	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
[709]	248	comm_inter, status, ierr )
[667]	249	!
[709]	250	!-- Receive v at the bottom surface from the ocean
[2232]	251	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
[709]	252	comm_inter, status, ierr )
[667]	253	!
	254	!-- Horizontal grid size or number of processors differs between
	255	!-- ocean and atmosphere
	256	ELSE
	257
	258	!
[709]	259	!-- Send heat flux at bottom surface to the ocean
[1353]	260	total_2d_a = 0.0_wp
	261	total_2d = 0.0_wp
[2232]	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 )
[709]	266
[2232]	267	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
[709]	268	comm2d, ierr )
	269	CALL interpolate_to_ocean( 12 )
[667]	270	!
[709]	271	!-- Send humidity flux at bottom surface to the ocean
	272	IF ( humidity ) THEN
[1353]	273	total_2d_a = 0.0_wp
	274	total_2d = 0.0_wp
[2232]	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 )
[709]	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 )
[667]	284	ENDIF
	285	!
[709]	286	!-- Receive temperature at the bottom surface from the ocean
	287	IF ( myid == 0 ) THEN
[2232]	288	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[667]	289	target_id, 14, comm_inter, status, ierr )
	290	ENDIF
	291	CALL MPI_BARRIER( comm2d, ierr )
[709]	292	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	293	ierr )
[667]	294	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	295	!
[709]	296	!-- Send momentum flux (u) at bottom surface to the ocean
[1353]	297	total_2d_a = 0.0_wp
	298	total_2d = 0.0_wp
[2232]	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 )
[709]	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 )
[667]	306	!
[709]	307	!-- Send momentum flux (v) at bottom surface to the ocean
[1353]	308	total_2d_a = 0.0_wp
	309	total_2d = 0.0_wp
[2232]	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 )
[709]	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 )
[667]	317	!
[709]	318	!-- Receive u at the bottom surface from the ocean
	319	IF ( myid == 0 ) THEN
[667]	320	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	321	target_id, 17, comm_inter, status, ierr )
[667]	322	ENDIF
	323	CALL MPI_BARRIER( comm2d, ierr )
[709]	324	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	325	ierr )
[667]	326	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	327	!
[709]	328	!-- Receive v at the bottom surface from the ocean
	329	IF ( myid == 0 ) THEN
[667]	330	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	331	target_id, 18, comm_inter, status, ierr )
[667]	332	ENDIF
	333	CALL MPI_BARRIER( comm2d, ierr )
[709]	334	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	335	ierr )
[667]	336	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	337
	338	ENDIF
	339
[102]	340	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	341
	342	!
[667]	343	!-- Horizontal grid size and number of processors is equal
	344	!-- in ocean and atmosphere
	345	IF ( coupling_topology == 0 ) THEN
	346	!
[709]	347	!-- Receive heat flux at the sea surface (top) from the atmosphere
[2232]	348	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
[709]	349	comm_inter, status, ierr )
[2232]	350	CALL transfer_2D_to_1D_equal( surf_def_h(2)%shf )
[102]	351	!
[709]	352	!-- Receive humidity flux from the atmosphere (bottom)
[667]	353	!-- and add it to the heat flux at the sea surface (top)...
	354	IF ( humidity_remote ) THEN
[2232]	355	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, &
[667]	356	target_id, 13, comm_inter, status, ierr )
[2232]	357	CALL transfer_2D_to_1D_equal( surf_def_h(2)%qsws )
[667]	358	ENDIF
	359	!
	360	!-- Send sea surface temperature to the atmosphere model
[709]	361	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
	362	comm_inter, ierr )
[667]	363	!
	364	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
[2232]	365	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
[709]	366	comm_inter, status, ierr )
[2232]	367	CALL transfer_2D_to_1D_equal( surf_def_h(2)%usws )
[667]	368	!
	369	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
[2232]	370	CALL MPI_RECV( surface_flux(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
[709]	371	comm_inter, status, ierr )
[2232]	372	CALL transfer_2D_to_1D_equal( surf_def_h(2)%vsws )
[667]	373	!
[709]	374	!-- Send u to the atmosphere
	375	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
	376	comm_inter, ierr )
[667]	377	!
[709]	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	!
[667]	382	!-- Horizontal gridsize or number of processors differs between
	383	!-- ocean and atmosphere
	384	ELSE
	385	!
[709]	386	!-- Receive heat flux at the sea surface (top) from the atmosphere
	387	IF ( myid == 0 ) THEN
[667]	388	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	389	target_id, 12, comm_inter, status, ierr )
[667]	390	ENDIF
	391	CALL MPI_BARRIER( comm2d, ierr )
[709]	392	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	393	ierr )
[2232]	394	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%shf )
[667]	395	!
[709]	396	!-- Receive humidity flux at the sea surface (top) from the atmosphere
	397	IF ( humidity_remote ) THEN
	398	IF ( myid == 0 ) THEN
[667]	399	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	400	target_id, 13, comm_inter, status, ierr )
[667]	401	ENDIF
	402	CALL MPI_BARRIER( comm2d, ierr )
[709]	403	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
	404	comm2d, ierr)
[2232]	405	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%qsws )
[667]	406	ENDIF
	407	!
	408	!-- Send surface temperature to atmosphere
[1353]	409	total_2d_o = 0.0_wp
	410	total_2d = 0.0_wp
[667]	411	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	412
[709]	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 )
[667]	416	!
[709]	417	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	418	IF ( myid == 0 ) THEN
[667]	419	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	420	target_id, 15, comm_inter, status, ierr )
[667]	421	ENDIF
	422	CALL MPI_BARRIER( comm2d, ierr )
	423	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	424	0, comm2d, ierr )
[2232]	425	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%usws )
[667]	426	!
[709]	427	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
	428	IF ( myid == 0 ) THEN
[667]	429	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	430	target_id, 16, comm_inter, status, ierr )
[667]	431	ENDIF
	432	CALL MPI_BARRIER( comm2d, ierr )
[709]	433	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	434	ierr )
[2232]	435	CALL transfer_2D_to_1D_unequal( surf_def_h(2)%vsws )
[667]	436	!
	437	!-- Send u to atmosphere
[1353]	438	total_2d_o = 0.0_wp
	439	total_2d = 0.0_wp
[667]	440	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
[709]	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 )
[667]	444	!
	445	!-- Send v to atmosphere
[1353]	446	total_2d_o = 0.0_wp
	447	total_2d = 0.0_wp
[667]	448	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
[709]	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 )
[667]	452
	453	ENDIF
	454
	455	!
	456	!-- Conversions of fluxes received from atmosphere
	457	IF ( humidity_remote ) THEN
[108]	458	!
[2232]	459	!-- Here top heat flux is still the sum of atmospheric bottom heat fluxes,
[709]	460	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	461	!-- /(rho_atm(=1.0)*c_p)
[2232]	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
[709]	468	!
[2232]	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
[108]	478	ENDIF
	479
	480	!
[102]	481	!-- Adjust the kinematic heat flux with respect to ocean density
[2232]	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
[102]	489
[2232]	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
[102]	493
[667]	494	ENDIF
	495
[709]	496	IF ( coupling_topology == 1 ) THEN
[667]	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
[2232]	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
[667]	661	END SUBROUTINE surface_coupler
	662
	663
	664
[1682]	665	!------------------------------------------------------------------------------!
	666	! Description:
	667	! ------------
	668	!> @todo Missing subroutine description.
	669	!------------------------------------------------------------------------------!
[709]	670	SUBROUTINE interpolate_to_atmos( tag )
[667]	671
[880]	672	#if defined( __parallel )
	673
[1320]	674	USE arrays_3d, &
	675	ONLY: total_2d_a, total_2d_o
[667]	676
[1320]	677	USE indices, &
	678	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	679
	680	USE kinds
	681
[1324]	682	USE pegrid
[1320]	683
[667]	684	IMPLICIT NONE
	685
[1682]	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 !<
[667]	694
[1682]	695	INTEGER(iwp), intent(in) :: tag !<
[1320]	696
[667]	697	CALL MPI_BARRIER( comm2d, ierr )
	698
[709]	699	IF ( myid == 0 ) THEN
	700	!
	701	!-- Cyclic boundary conditions for the total 2D-grid
[667]	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
[102]	708	!
[667]	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)
[102]	712
	713	!
[709]	714	!-- Distance for interpolation around coarse grid points within the fine
	715	!-- grid (note: 2*dnx2 must not be equal with dnx)
[667]	716	dnx2 = 2 * ( dnx / 2 )
	717	dny2 = 2 * ( dny / 2 )
[102]	718
[1353]	719	total_2d_a = 0.0_wp
[102]	720	!
[667]	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	!
[709]	734	!-- Cyclic boundary conditions for atmosphere grid
[667]	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
[709]	742	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
	743	tag, comm_inter, ierr )
[102]	744
	745	ENDIF
	746
[667]	747	CALL MPI_BARRIER( comm2d, ierr )
[102]	748
[880]	749	#endif
	750
[667]	751	END SUBROUTINE interpolate_to_atmos
[102]	752
[667]	753
[1682]	754	!------------------------------------------------------------------------------!
	755	! Description:
	756	! ------------
	757	!> @todo Missing subroutine description.
	758	!------------------------------------------------------------------------------!
[709]	759	SUBROUTINE interpolate_to_ocean( tag )
[667]	760
[880]	761	#if defined( __parallel )
	762
[1320]	763	USE arrays_3d, &
	764	ONLY: total_2d_a, total_2d_o
[667]	765
[1320]	766	USE indices, &
	767	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	768
	769	USE kinds
	770
[1324]	771	USE pegrid
[1320]	772
[667]	773	IMPLICIT NONE
	774
[1682]	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 !<
[667]	782
[1682]	783	REAL(wp) :: fl !<
	784	REAL(wp) :: fr !<
	785	REAL(wp) :: myl !<
	786	REAL(wp) :: myr !<
[709]	787
[667]	788	CALL MPI_BARRIER( comm2d, ierr )
	789
[709]	790	IF ( myid == 0 ) THEN
[667]	791
	792	!
[709]	793	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
[667]	794	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	795	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	796
	797	!
[709]	798	!-- Cyclic boundary conditions for atmosphere grid
[667]	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	!
[709]	805	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
[667]	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
[709]	811	fl = myl*jj + total_2d_a(j,i)
	812	fr = myr*jj + total_2d_a(j,i+1)
[667]	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	!
[709]	820	!-- Cyclic boundary conditions for ocean grid
[667]	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
[880]	834	#endif
	835
[667]	836	END SUBROUTINE interpolate_to_ocean

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