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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1419

Last change on this file since 1419 was 1419, checked in by fricke, 10 years ago
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[102]	1	SUBROUTINE surface_coupler
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later 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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[258]	20	! Current revisions:
[1092]	21	! ------------------
[1321]	22	!
[1419]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: surface_coupler.f90 1419 2014-06-06 13:09:34Z fricke $
	27	!
[1419]	28	! 1418 2014-06-06 13:05:08Z fricke
	29	! Bugfix: For caluclation of the salinity flux at the sea surface,
	30	! the given value for salinity must be in percent and not in psu
	31	!
[1354]	32	! 1353 2014-04-08 15:21:23Z heinze
	33	! REAL constants provided with KIND-attribute
	34	!
[1325]	35	! 1324 2014-03-21 09:13:16Z suehring
	36	! Bugfix: ONLY statement for module pegrid removed
	37	!
[1323]	38	! 1322 2014-03-20 16:38:49Z raasch
	39	! REAL constants defined as wp-kind
	40	!
[1321]	41	! 1320 2014-03-20 08:40:49Z raasch
[1320]	42	! ONLY-attribute added to USE-statements,
	43	! kind-parameters added to all INTEGER and REAL declaration statements,
	44	! kinds are defined in new module kinds,
	45	! old module precision_kind is removed,
	46	! revision history before 2012 removed,
	47	! comment fields (!:) to be used for variable explanations added to
	48	! all variable declaration statements
[102]	49	!
[1319]	50	! 1318 2014-03-17 13:35:16Z raasch
	51	! module interfaces removed
	52	!
[1093]	53	! 1092 2013-02-02 11:24:22Z raasch
	54	! unused variables removed
	55	!
[1037]	56	! 1036 2012-10-22 13:43:42Z raasch
	57	! code put under GPL (PALM 3.9)
	58	!
[881]	59	! 880 2012-04-13 06:28:59Z raasch
	60	! Bugfix: preprocessor statements for parallel execution added
	61	!
[110]	62	! 109 2007-08-28 15:26:47Z letzel
[102]	63	! Initial revision
	64	!
	65	! Description:
	66	! ------------
	67	! Data exchange at the interface between coupled models
	68	!------------------------------------------------------------------------------!
	69
[1320]	70	USE arrays_3d, &
	71	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
	72	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
	73
	74	USE control_parameters, &
	75	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
	76	humidity, humidity_remote, message_string, terminate_coupled, &
	77	terminate_coupled_remote, time_since_reference_point
	78
	79	USE cpulog, &
	80	ONLY: cpu_log, log_point
	81
	82	USE indices, &
	83	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
	84	nysg, ny_a, ny_o, nzt
	85
	86	USE kinds
	87
[102]	88	USE pegrid
	89
	90	IMPLICIT NONE
	91
[1320]	92	REAL(wp) :: time_since_reference_point_rem !:
	93	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
[102]	94
[206]	95	#if defined( __parallel )
[102]	96
[667]	97	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	98
[667]	99
	100
[102]	101	!
[108]	102	!-- In case of model termination initiated by the remote model
	103	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
	104	!-- The rest of the coupler must then be skipped because it would cause an MPI
	105	!-- intercomminucation hang.
	106	!-- If necessary, the coupler will be called at the beginning of the next
	107	!-- restart run.
[667]	108
	109	IF ( coupling_topology == 0 ) THEN
[709]	110	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	111	0, &
	112	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
[667]	113	0, comm_inter, status, ierr )
	114	ELSE
	115	IF ( myid == 0) THEN
	116	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
	117	target_id, 0, &
	118	terminate_coupled_remote, 1, MPI_INTEGER, &
	119	target_id, 0, &
	120	comm_inter, status, ierr )
	121	ENDIF
[709]	122	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
	123	ierr )
[667]	124
	125	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
	126	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
	127
	128	ENDIF
	129
[108]	130	IF ( terminate_coupled_remote > 0 ) THEN
[274]	131	WRITE( message_string, * ) 'remote model "', &
	132	TRIM( coupling_mode_remote ), &
	133	'" terminated', &
	134	'&with terminate_coupled_remote = ', &
	135	terminate_coupled_remote, &
	136	'&local model "', TRIM( coupling_mode ), &
	137	'" has', &
	138	'&terminate_coupled = ', &
[667]	139	terminate_coupled
[258]	140	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	141	RETURN
	142	ENDIF
[667]	143
[291]	144
[108]	145	!
	146	!-- Exchange the current simulated time between the models,
[667]	147	!-- currently just for total_2ding
[709]	148	IF ( coupling_topology == 0 ) THEN
	149
	150	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
	151	comm_inter, ierr )
	152	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
	153	11, comm_inter, status, ierr )
[667]	154	ELSE
[709]	155
[667]	156	IF ( myid == 0 ) THEN
[709]	157
	158	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
	159	11, comm_inter, ierr )
	160	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
[667]	161	target_id, 11, comm_inter, status, ierr )
[709]	162
[667]	163	ENDIF
[709]	164
	165	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
	166	ierr )
	167
[667]	168	ENDIF
[102]	169
	170	!
	171	!-- Exchange the interface data
	172	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	173
	174	!
[709]	175	!-- Horizontal grid size and number of processors is equal in ocean and
	176	!-- atmosphere
	177	IF ( coupling_topology == 0 ) THEN
[102]	178
	179	!
[709]	180	!-- Send heat flux at bottom surface to the ocean
	181	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	182	comm_inter, ierr )
[102]	183	!
[709]	184	!-- Send humidity flux at bottom surface to the ocean
[667]	185	IF ( humidity ) THEN
[709]	186	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
	187	comm_inter, ierr )
[667]	188	ENDIF
	189	!
[709]	190	!-- Receive temperature at the bottom surface from the ocean
	191	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
	192	comm_inter, status, ierr )
[108]	193	!
[709]	194	!-- Send the momentum flux (u) at bottom surface to the ocean
	195	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	196	comm_inter, ierr )
[102]	197	!
[709]	198	!-- Send the momentum flux (v) at bottom surface to the ocean
	199	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	200	comm_inter, ierr )
[102]	201	!
[709]	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 )
[667]	205	!
[709]	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 )
[667]	209	!
	210	!-- Horizontal grid size or number of processors differs between
	211	!-- ocean and atmosphere
	212	ELSE
	213
	214	!
[709]	215	!-- Send heat flux at bottom surface to the ocean
[1353]	216	total_2d_a = 0.0_wp
	217	total_2d = 0.0_wp
[667]	218	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
[709]	219
	220	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	221	comm2d, ierr )
	222	CALL interpolate_to_ocean( 12 )
[667]	223	!
[709]	224	!-- Send humidity flux at bottom surface to the ocean
	225	IF ( humidity ) THEN
[1353]	226	total_2d_a = 0.0_wp
	227	total_2d = 0.0_wp
[667]	228	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
[709]	229
	230	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
	231	0, comm2d, ierr )
	232	CALL interpolate_to_ocean( 13 )
[667]	233	ENDIF
	234	!
[709]	235	!-- Receive temperature at the bottom surface from the ocean
	236	IF ( myid == 0 ) THEN
[667]	237	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	238	target_id, 14, comm_inter, status, ierr )
	239	ENDIF
	240	CALL MPI_BARRIER( comm2d, ierr )
[709]	241	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	242	ierr )
[667]	243	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	244	!
[709]	245	!-- Send momentum flux (u) at bottom surface to the ocean
[1353]	246	total_2d_a = 0.0_wp
	247	total_2d = 0.0_wp
[667]	248	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
[709]	249	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	250	comm2d, ierr )
	251	CALL interpolate_to_ocean( 15 )
[667]	252	!
[709]	253	!-- Send momentum flux (v) at bottom surface to the ocean
[1353]	254	total_2d_a = 0.0_wp
	255	total_2d = 0.0_wp
[667]	256	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
[709]	257	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	258	comm2d, ierr )
	259	CALL interpolate_to_ocean( 16 )
[667]	260	!
[709]	261	!-- Receive u at the bottom surface from the ocean
	262	IF ( myid == 0 ) THEN
[667]	263	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	264	target_id, 17, comm_inter, status, ierr )
[667]	265	ENDIF
	266	CALL MPI_BARRIER( comm2d, ierr )
[709]	267	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	268	ierr )
[667]	269	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	270	!
[709]	271	!-- Receive v at the bottom surface from the ocean
	272	IF ( myid == 0 ) THEN
[667]	273	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	274	target_id, 18, comm_inter, status, ierr )
[667]	275	ENDIF
	276	CALL MPI_BARRIER( comm2d, ierr )
[709]	277	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	278	ierr )
[667]	279	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	280
	281	ENDIF
	282
[102]	283	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	284
	285	!
[667]	286	!-- Horizontal grid size and number of processors is equal
	287	!-- in ocean and atmosphere
	288	IF ( coupling_topology == 0 ) THEN
	289	!
[709]	290	!-- Receive heat flux at the sea surface (top) from the atmosphere
	291	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	292	comm_inter, status, ierr )
[102]	293	!
[709]	294	!-- Receive humidity flux from the atmosphere (bottom)
[667]	295	!-- and add it to the heat flux at the sea surface (top)...
	296	IF ( humidity_remote ) THEN
	297	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
	298	target_id, 13, comm_inter, status, ierr )
	299	ENDIF
	300	!
	301	!-- Send sea surface temperature to the atmosphere model
[709]	302	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
	303	comm_inter, ierr )
[667]	304	!
	305	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
[709]	306	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	307	comm_inter, status, ierr )
[667]	308	!
	309	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
[709]	310	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	311	comm_inter, status, ierr )
[667]	312	!
[709]	313	!-- Send u to the atmosphere
	314	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
	315	comm_inter, ierr )
[667]	316	!
[709]	317	!-- Send v to the atmosphere
	318	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
	319	comm_inter, ierr )
	320	!
[667]	321	!-- Horizontal gridsize or number of processors differs between
	322	!-- ocean and atmosphere
	323	ELSE
	324	!
[709]	325	!-- Receive heat flux at the sea surface (top) from the atmosphere
	326	IF ( myid == 0 ) THEN
[667]	327	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	328	target_id, 12, comm_inter, status, ierr )
[667]	329	ENDIF
	330	CALL MPI_BARRIER( comm2d, ierr )
[709]	331	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	332	ierr )
[667]	333	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	334	!
[709]	335	!-- Receive humidity flux at the sea surface (top) from the atmosphere
	336	IF ( humidity_remote ) THEN
	337	IF ( myid == 0 ) THEN
[667]	338	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	339	target_id, 13, comm_inter, status, ierr )
[667]	340	ENDIF
	341	CALL MPI_BARRIER( comm2d, ierr )
[709]	342	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
	343	comm2d, ierr)
[667]	344	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	345	ENDIF
	346	!
	347	!-- Send surface temperature to atmosphere
[1353]	348	total_2d_o = 0.0_wp
	349	total_2d = 0.0_wp
[667]	350	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	351
[709]	352	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	353	comm2d, ierr)
	354	CALL interpolate_to_atmos( 14 )
[667]	355	!
[709]	356	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	357	IF ( myid == 0 ) THEN
[667]	358	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	359	target_id, 15, comm_inter, status, ierr )
[667]	360	ENDIF
	361	CALL MPI_BARRIER( comm2d, ierr )
	362	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	363	0, comm2d, ierr )
[667]	364	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	365	!
[709]	366	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
	367	IF ( myid == 0 ) THEN
[667]	368	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	369	target_id, 16, comm_inter, status, ierr )
[667]	370	ENDIF
	371	CALL MPI_BARRIER( comm2d, ierr )
[709]	372	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	373	ierr )
[667]	374	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	375	!
	376	!-- Send u to atmosphere
[1353]	377	total_2d_o = 0.0_wp
	378	total_2d = 0.0_wp
[667]	379	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
[709]	380	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	381	comm2d, ierr )
	382	CALL interpolate_to_atmos( 17 )
[667]	383	!
	384	!-- Send v to atmosphere
[1353]	385	total_2d_o = 0.0_wp
	386	total_2d = 0.0_wp
[667]	387	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
[709]	388	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	389	comm2d, ierr )
	390	CALL interpolate_to_atmos( 18 )
[667]	391
	392	ENDIF
	393
	394	!
	395	!-- Conversions of fluxes received from atmosphere
	396	IF ( humidity_remote ) THEN
[108]	397	!
[709]	398	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
	399	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	400	!-- /(rho_atm(=1.0)*c_p)
[1322]	401	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
[709]	402	!
[667]	403	!-- ...and convert it to a salinity flux at the sea surface (top)
[108]	404	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
	405	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
[1418]	406	saswst = -1.0_wp * sa(nzt,:,:) * 0.001 * qswst_remote / &
	407	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001 ) )
[108]	408	ENDIF
	409
	410	!
[102]	411	!-- Adjust the kinematic heat flux with respect to ocean density
	412	!-- (constants are the specific heat capacities for air and water)
[667]	413	!-- now tswst is the ocean top heat flux
[1322]	414	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
[102]	415
	416	!
[667]	417	!-- Adjust the momentum fluxes with respect to ocean density
	418	uswst = uswst / rho(nzt,:,:)
	419	vswst = vswst / rho(nzt,:,:)
[102]	420
[667]	421	ENDIF
	422
[709]	423	IF ( coupling_topology == 1 ) THEN
[667]	424	DEALLOCATE( total_2d_o, total_2d_a )
	425	ENDIF
	426
	427	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
	428
	429	#endif
	430
	431	END SUBROUTINE surface_coupler
	432
	433
	434
[709]	435	SUBROUTINE interpolate_to_atmos( tag )
[667]	436
[880]	437	#if defined( __parallel )
	438
[1320]	439	USE arrays_3d, &
	440	ONLY: total_2d_a, total_2d_o
[667]	441
[1320]	442	USE indices, &
	443	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	444
	445	USE kinds
	446
[1324]	447	USE pegrid
[1320]	448
[667]	449	IMPLICIT NONE
	450
[1320]	451	INTEGER(iwp) :: dnx !:
	452	INTEGER(iwp) :: dnx2 !:
	453	INTEGER(iwp) :: dny !:
	454	INTEGER(iwp) :: dny2 !:
	455	INTEGER(iwp) :: i !:
	456	INTEGER(iwp) :: ii !:
	457	INTEGER(iwp) :: j !:
	458	INTEGER(iwp) :: jj !:
[667]	459
[1320]	460	INTEGER(iwp), intent(in) :: tag !:
	461
[667]	462	CALL MPI_BARRIER( comm2d, ierr )
	463
[709]	464	IF ( myid == 0 ) THEN
	465	!
	466	!-- Cyclic boundary conditions for the total 2D-grid
[667]	467	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
	468	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
	469
	470	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
	471	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
	472
[102]	473	!
[667]	474	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
	475	dnx = (nx_o+1) / (nx_a+1)
	476	dny = (ny_o+1) / (ny_a+1)
[102]	477
	478	!
[709]	479	!-- Distance for interpolation around coarse grid points within the fine
	480	!-- grid (note: 2*dnx2 must not be equal with dnx)
[667]	481	dnx2 = 2 * ( dnx / 2 )
	482	dny2 = 2 * ( dny / 2 )
[102]	483
[1353]	484	total_2d_a = 0.0_wp
[102]	485	!
[667]	486	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
	487	DO j = 0, ny_a
	488	DO i = 0, nx_a
	489	DO jj = 0, dny2
	490	DO ii = 0, dnx2
	491	total_2d_a(j,i) = total_2d_a(j,i) &
	492	+ total_2d_o(jdny+jj,idnx+ii)
	493	ENDDO
	494	ENDDO
	495	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
	496	ENDDO
	497	ENDDO
	498	!
[709]	499	!-- Cyclic boundary conditions for atmosphere grid
[667]	500	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
	501	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
	502
	503	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
	504	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
	505	!
	506	!-- Transfer of the atmosphere-grid-layer to the atmosphere
[709]	507	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
	508	tag, comm_inter, ierr )
[102]	509
	510	ENDIF
	511
[667]	512	CALL MPI_BARRIER( comm2d, ierr )
[102]	513
[880]	514	#endif
	515
[667]	516	END SUBROUTINE interpolate_to_atmos
[102]	517
[667]	518
[709]	519	SUBROUTINE interpolate_to_ocean( tag )
[667]	520
[880]	521	#if defined( __parallel )
	522
[1320]	523	USE arrays_3d, &
	524	ONLY: total_2d_a, total_2d_o
[667]	525
[1320]	526	USE indices, &
	527	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	528
	529	USE kinds
	530
[1324]	531	USE pegrid
[1320]	532
[667]	533	IMPLICIT NONE
	534
[1320]	535	INTEGER(iwp) :: dnx !:
	536	INTEGER(iwp) :: dny !:
	537	INTEGER(iwp) :: i !:
	538	INTEGER(iwp) :: ii !:
	539	INTEGER(iwp) :: j !:
	540	INTEGER(iwp) :: jj !:
	541	INTEGER(iwp), intent(in) :: tag !:
[667]	542
[1320]	543	REAL(wp) :: fl !:
	544	REAL(wp) :: fr !:
	545	REAL(wp) :: myl !:
	546	REAL(wp) :: myr !:
[709]	547
[667]	548	CALL MPI_BARRIER( comm2d, ierr )
	549
[709]	550	IF ( myid == 0 ) THEN
[667]	551
	552	!
[709]	553	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
[667]	554	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	555	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	556
	557	!
[709]	558	!-- Cyclic boundary conditions for atmosphere grid
[667]	559	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
	560	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
	561
	562	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
	563	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
	564	!
[709]	565	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
[667]	566	DO j = 0, ny
	567	DO i = 0, nx
	568	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
	569	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
	570	DO jj = 0, dny-1
[709]	571	fl = myl*jj + total_2d_a(j,i)
	572	fr = myr*jj + total_2d_a(j,i+1)
[667]	573	DO ii = 0, dnx-1
	574	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
	575	ENDDO
	576	ENDDO
	577	ENDDO
	578	ENDDO
	579	!
[709]	580	!-- Cyclic boundary conditions for ocean grid
[667]	581	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
	582	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
	583
	584	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
	585	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
	586
	587	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	588	target_id, tag, comm_inter, ierr )
	589
	590	ENDIF
	591
	592	CALL MPI_BARRIER( comm2d, ierr )
	593
[880]	594	#endif
	595
[667]	596	END SUBROUTINE interpolate_to_ocean

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