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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1323

Last change on this file since 1323 was 1323, checked in by raasch, 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	!
[1323]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: surface_coupler.f90 1323 2014-03-20 17:09:54Z raasch $
	27	!
[1323]	28	! 1322 2014-03-20 16:38:49Z raasch
	29	! REAL constants defined as wp-kind
	30	!
[1321]	31	! 1320 2014-03-20 08:40:49Z raasch
[1320]	32	! ONLY-attribute added to USE-statements,
	33	! kind-parameters added to all INTEGER and REAL declaration statements,
	34	! kinds are defined in new module kinds,
	35	! old module precision_kind is removed,
	36	! revision history before 2012 removed,
	37	! comment fields (!:) to be used for variable explanations added to
	38	! all variable declaration statements
[102]	39	!
[1319]	40	! 1318 2014-03-17 13:35:16Z raasch
	41	! module interfaces removed
	42	!
[1093]	43	! 1092 2013-02-02 11:24:22Z raasch
	44	! unused variables removed
	45	!
[1037]	46	! 1036 2012-10-22 13:43:42Z raasch
	47	! code put under GPL (PALM 3.9)
	48	!
[881]	49	! 880 2012-04-13 06:28:59Z raasch
	50	! Bugfix: preprocessor statements for parallel execution added
	51	!
[110]	52	! 109 2007-08-28 15:26:47Z letzel
[102]	53	! Initial revision
	54	!
	55	! Description:
	56	! ------------
	57	! Data exchange at the interface between coupled models
	58	!------------------------------------------------------------------------------!
	59
[1320]	60	USE arrays_3d, &
	61	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
	62	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
	63
	64	USE control_parameters, &
	65	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
	66	humidity, humidity_remote, message_string, terminate_coupled, &
	67	terminate_coupled_remote, time_since_reference_point
	68
	69	USE cpulog, &
	70	ONLY: cpu_log, log_point
	71
	72	USE indices, &
	73	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
	74	nysg, ny_a, ny_o, nzt
	75
	76	USE kinds
	77
[102]	78	USE pegrid
	79
	80	IMPLICIT NONE
	81
[1320]	82	REAL(wp) :: time_since_reference_point_rem !:
	83	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
[102]	84
[206]	85	#if defined( __parallel )
[102]	86
[667]	87	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	88
[667]	89
	90
[102]	91	!
[108]	92	!-- In case of model termination initiated by the remote model
	93	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
	94	!-- The rest of the coupler must then be skipped because it would cause an MPI
	95	!-- intercomminucation hang.
	96	!-- If necessary, the coupler will be called at the beginning of the next
	97	!-- restart run.
[667]	98
	99	IF ( coupling_topology == 0 ) THEN
[709]	100	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	101	0, &
	102	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
[667]	103	0, comm_inter, status, ierr )
	104	ELSE
	105	IF ( myid == 0) THEN
	106	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
	107	target_id, 0, &
	108	terminate_coupled_remote, 1, MPI_INTEGER, &
	109	target_id, 0, &
	110	comm_inter, status, ierr )
	111	ENDIF
[709]	112	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
	113	ierr )
[667]	114
	115	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
	116	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
	117
	118	ENDIF
	119
[108]	120	IF ( terminate_coupled_remote > 0 ) THEN
[274]	121	WRITE( message_string, * ) 'remote model "', &
	122	TRIM( coupling_mode_remote ), &
	123	'" terminated', &
	124	'&with terminate_coupled_remote = ', &
	125	terminate_coupled_remote, &
	126	'&local model "', TRIM( coupling_mode ), &
	127	'" has', &
	128	'&terminate_coupled = ', &
[667]	129	terminate_coupled
[258]	130	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	131	RETURN
	132	ENDIF
[667]	133
[291]	134
[108]	135	!
	136	!-- Exchange the current simulated time between the models,
[667]	137	!-- currently just for total_2ding
[709]	138	IF ( coupling_topology == 0 ) THEN
	139
	140	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
	141	comm_inter, ierr )
	142	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
	143	11, comm_inter, status, ierr )
[667]	144	ELSE
[709]	145
[667]	146	IF ( myid == 0 ) THEN
[709]	147
	148	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
	149	11, comm_inter, ierr )
	150	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
[667]	151	target_id, 11, comm_inter, status, ierr )
[709]	152
[667]	153	ENDIF
[709]	154
	155	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
	156	ierr )
	157
[667]	158	ENDIF
[102]	159
	160	!
	161	!-- Exchange the interface data
	162	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	163
	164	!
[709]	165	!-- Horizontal grid size and number of processors is equal in ocean and
	166	!-- atmosphere
	167	IF ( coupling_topology == 0 ) THEN
[102]	168
	169	!
[709]	170	!-- Send heat flux at bottom surface to the ocean
	171	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	172	comm_inter, ierr )
[102]	173	!
[709]	174	!-- Send humidity flux at bottom surface to the ocean
[667]	175	IF ( humidity ) THEN
[709]	176	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
	177	comm_inter, ierr )
[667]	178	ENDIF
	179	!
[709]	180	!-- Receive temperature at the bottom surface from the ocean
	181	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
	182	comm_inter, status, ierr )
[108]	183	!
[709]	184	!-- Send the momentum flux (u) at bottom surface to the ocean
	185	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	186	comm_inter, ierr )
[102]	187	!
[709]	188	!-- Send the momentum flux (v) at bottom surface to the ocean
	189	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	190	comm_inter, ierr )
[102]	191	!
[709]	192	!-- Receive u at the bottom surface from the ocean
	193	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
	194	comm_inter, status, ierr )
[667]	195	!
[709]	196	!-- Receive v at the bottom surface from the ocean
	197	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
	198	comm_inter, status, ierr )
[667]	199	!
	200	!-- Horizontal grid size or number of processors differs between
	201	!-- ocean and atmosphere
	202	ELSE
	203
	204	!
[709]	205	!-- Send heat flux at bottom surface to the ocean
[667]	206	total_2d_a = 0.0
[709]	207	total_2d = 0.0
[667]	208	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
[709]	209
	210	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	211	comm2d, ierr )
	212	CALL interpolate_to_ocean( 12 )
[667]	213	!
[709]	214	!-- Send humidity flux at bottom surface to the ocean
	215	IF ( humidity ) THEN
[667]	216	total_2d_a = 0.0
[709]	217	total_2d = 0.0
[667]	218	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
[709]	219
	220	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
	221	0, comm2d, ierr )
	222	CALL interpolate_to_ocean( 13 )
[667]	223	ENDIF
	224	!
[709]	225	!-- Receive temperature at the bottom surface from the ocean
	226	IF ( myid == 0 ) THEN
[667]	227	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	228	target_id, 14, comm_inter, status, ierr )
	229	ENDIF
	230	CALL MPI_BARRIER( comm2d, ierr )
[709]	231	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	232	ierr )
[667]	233	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	234	!
[709]	235	!-- Send momentum flux (u) at bottom surface to the ocean
[667]	236	total_2d_a = 0.0
[709]	237	total_2d = 0.0
[667]	238	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
[709]	239	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	240	comm2d, ierr )
	241	CALL interpolate_to_ocean( 15 )
[667]	242	!
[709]	243	!-- Send momentum flux (v) at bottom surface to the ocean
[667]	244	total_2d_a = 0.0
[709]	245	total_2d = 0.0
[667]	246	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
[709]	247	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	248	comm2d, ierr )
	249	CALL interpolate_to_ocean( 16 )
[667]	250	!
[709]	251	!-- Receive u at the bottom surface from the ocean
	252	IF ( myid == 0 ) THEN
[667]	253	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	254	target_id, 17, comm_inter, status, ierr )
[667]	255	ENDIF
	256	CALL MPI_BARRIER( comm2d, ierr )
[709]	257	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	258	ierr )
[667]	259	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	260	!
[709]	261	!-- Receive v 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, 18, 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	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	270
	271	ENDIF
	272
[102]	273	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	274
	275	!
[667]	276	!-- Horizontal grid size and number of processors is equal
	277	!-- in ocean and atmosphere
	278	IF ( coupling_topology == 0 ) THEN
	279	!
[709]	280	!-- Receive heat flux at the sea surface (top) from the atmosphere
	281	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	282	comm_inter, status, ierr )
[102]	283	!
[709]	284	!-- Receive humidity flux from the atmosphere (bottom)
[667]	285	!-- and add it to the heat flux at the sea surface (top)...
	286	IF ( humidity_remote ) THEN
	287	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
	288	target_id, 13, comm_inter, status, ierr )
	289	ENDIF
	290	!
	291	!-- Send sea surface temperature to the atmosphere model
[709]	292	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
	293	comm_inter, ierr )
[667]	294	!
	295	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
[709]	296	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	297	comm_inter, status, ierr )
[667]	298	!
	299	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
[709]	300	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	301	comm_inter, status, ierr )
[667]	302	!
[709]	303	!-- Send u to the atmosphere
	304	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
	305	comm_inter, ierr )
[667]	306	!
[709]	307	!-- Send v to the atmosphere
	308	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
	309	comm_inter, ierr )
	310	!
[667]	311	!-- Horizontal gridsize or number of processors differs between
	312	!-- ocean and atmosphere
	313	ELSE
	314	!
[709]	315	!-- Receive heat flux at the sea surface (top) from the atmosphere
	316	IF ( myid == 0 ) THEN
[667]	317	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	318	target_id, 12, comm_inter, status, ierr )
[667]	319	ENDIF
	320	CALL MPI_BARRIER( comm2d, ierr )
[709]	321	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	322	ierr )
[667]	323	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	324	!
[709]	325	!-- Receive humidity flux at the sea surface (top) from the atmosphere
	326	IF ( humidity_remote ) THEN
	327	IF ( myid == 0 ) THEN
[667]	328	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	329	target_id, 13, comm_inter, status, ierr )
[667]	330	ENDIF
	331	CALL MPI_BARRIER( comm2d, ierr )
[709]	332	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
	333	comm2d, ierr)
[667]	334	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	335	ENDIF
	336	!
	337	!-- Send surface temperature to atmosphere
	338	total_2d_o = 0.0
[709]	339	total_2d = 0.0
[667]	340	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	341
[709]	342	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	343	comm2d, ierr)
	344	CALL interpolate_to_atmos( 14 )
[667]	345	!
[709]	346	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	347	IF ( myid == 0 ) THEN
[667]	348	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	349	target_id, 15, comm_inter, status, ierr )
[667]	350	ENDIF
	351	CALL MPI_BARRIER( comm2d, ierr )
	352	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	353	0, comm2d, ierr )
[667]	354	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	355	!
[709]	356	!-- Receive momentum flux (v) 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, 16, comm_inter, status, ierr )
[667]	360	ENDIF
	361	CALL MPI_BARRIER( comm2d, ierr )
[709]	362	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	363	ierr )
[667]	364	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	365	!
	366	!-- Send u to atmosphere
	367	total_2d_o = 0.0
[709]	368	total_2d = 0.0
[667]	369	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
[709]	370	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	371	comm2d, ierr )
	372	CALL interpolate_to_atmos( 17 )
[667]	373	!
	374	!-- Send v to atmosphere
	375	total_2d_o = 0.0
[709]	376	total_2d = 0.0
[667]	377	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
[709]	378	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	379	comm2d, ierr )
	380	CALL interpolate_to_atmos( 18 )
[667]	381
	382	ENDIF
	383
	384	!
	385	!-- Conversions of fluxes received from atmosphere
	386	IF ( humidity_remote ) THEN
[108]	387	!
[709]	388	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
	389	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	390	!-- /(rho_atm(=1.0)*c_p)
[1322]	391	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
[709]	392	!
[667]	393	!-- ...and convert it to a salinity flux at the sea surface (top)
[108]	394	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
	395	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
	396	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
[667]	397	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
[108]	398	ENDIF
	399
	400	!
[102]	401	!-- Adjust the kinematic heat flux with respect to ocean density
	402	!-- (constants are the specific heat capacities for air and water)
[667]	403	!-- now tswst is the ocean top heat flux
[1322]	404	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
[102]	405
	406	!
[667]	407	!-- Adjust the momentum fluxes with respect to ocean density
	408	uswst = uswst / rho(nzt,:,:)
	409	vswst = vswst / rho(nzt,:,:)
[102]	410
[667]	411	ENDIF
	412
[709]	413	IF ( coupling_topology == 1 ) THEN
[667]	414	DEALLOCATE( total_2d_o, total_2d_a )
	415	ENDIF
	416
	417	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
	418
	419	#endif
	420
	421	END SUBROUTINE surface_coupler
	422
	423
	424
[709]	425	SUBROUTINE interpolate_to_atmos( tag )
[667]	426
[880]	427	#if defined( __parallel )
	428
[1320]	429	USE arrays_3d, &
	430	ONLY: total_2d_a, total_2d_o
[667]	431
[1320]	432	USE indices, &
	433	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	434
	435	USE kinds
	436
	437	USE pegrid, &
	438	ONLY: comm2d, comm_inter, ierr, MPI_DOUBLE_PRECISION, myid, ngp_a, &
	439	target_id
	440
[667]	441	IMPLICIT NONE
	442
[1320]	443	INTEGER(iwp) :: dnx !:
	444	INTEGER(iwp) :: dnx2 !:
	445	INTEGER(iwp) :: dny !:
	446	INTEGER(iwp) :: dny2 !:
	447	INTEGER(iwp) :: i !:
	448	INTEGER(iwp) :: ii !:
	449	INTEGER(iwp) :: j !:
	450	INTEGER(iwp) :: jj !:
[667]	451
[1320]	452	INTEGER(iwp), intent(in) :: tag !:
	453
[667]	454	CALL MPI_BARRIER( comm2d, ierr )
	455
[709]	456	IF ( myid == 0 ) THEN
	457	!
	458	!-- Cyclic boundary conditions for the total 2D-grid
[667]	459	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
	460	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
	461
	462	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
	463	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
	464
[102]	465	!
[667]	466	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
	467	dnx = (nx_o+1) / (nx_a+1)
	468	dny = (ny_o+1) / (ny_a+1)
[102]	469
	470	!
[709]	471	!-- Distance for interpolation around coarse grid points within the fine
	472	!-- grid (note: 2*dnx2 must not be equal with dnx)
[667]	473	dnx2 = 2 * ( dnx / 2 )
	474	dny2 = 2 * ( dny / 2 )
[102]	475
[667]	476	total_2d_a = 0.0
[102]	477	!
[667]	478	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
	479	DO j = 0, ny_a
	480	DO i = 0, nx_a
	481	DO jj = 0, dny2
	482	DO ii = 0, dnx2
	483	total_2d_a(j,i) = total_2d_a(j,i) &
	484	+ total_2d_o(jdny+jj,idnx+ii)
	485	ENDDO
	486	ENDDO
	487	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
	488	ENDDO
	489	ENDDO
	490	!
[709]	491	!-- Cyclic boundary conditions for atmosphere grid
[667]	492	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
	493	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
	494
	495	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
	496	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
	497	!
	498	!-- Transfer of the atmosphere-grid-layer to the atmosphere
[709]	499	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
	500	tag, comm_inter, ierr )
[102]	501
	502	ENDIF
	503
[667]	504	CALL MPI_BARRIER( comm2d, ierr )
[102]	505
[880]	506	#endif
	507
[667]	508	END SUBROUTINE interpolate_to_atmos
[102]	509
[667]	510
[709]	511	SUBROUTINE interpolate_to_ocean( tag )
[667]	512
[880]	513	#if defined( __parallel )
	514
[1320]	515	USE arrays_3d, &
	516	ONLY: total_2d_a, total_2d_o
[667]	517
[1320]	518	USE indices, &
	519	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	520
	521	USE kinds
	522
	523	USE pegrid, &
	524	ONLY: comm2d, comm_inter, ierr, MPI_DOUBLE_PRECISION, myid, ngp_o, &
	525	target_id
	526
[667]	527	IMPLICIT NONE
	528
[1320]	529	INTEGER(iwp) :: dnx !:
	530	INTEGER(iwp) :: dny !:
	531	INTEGER(iwp) :: i !:
	532	INTEGER(iwp) :: ii !:
	533	INTEGER(iwp) :: j !:
	534	INTEGER(iwp) :: jj !:
	535	INTEGER(iwp), intent(in) :: tag !:
[667]	536
[1320]	537	REAL(wp) :: fl !:
	538	REAL(wp) :: fr !:
	539	REAL(wp) :: myl !:
	540	REAL(wp) :: myr !:
[709]	541
[667]	542	CALL MPI_BARRIER( comm2d, ierr )
	543
[709]	544	IF ( myid == 0 ) THEN
[667]	545
	546	!
[709]	547	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
[667]	548	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	549	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	550
	551	!
[709]	552	!-- Cyclic boundary conditions for atmosphere grid
[667]	553	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
	554	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
	555
	556	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
	557	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
	558	!
[709]	559	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
[667]	560	DO j = 0, ny
	561	DO i = 0, nx
	562	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
	563	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
	564	DO jj = 0, dny-1
[709]	565	fl = myl*jj + total_2d_a(j,i)
	566	fr = myr*jj + total_2d_a(j,i+1)
[667]	567	DO ii = 0, dnx-1
	568	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
	569	ENDDO
	570	ENDDO
	571	ENDDO
	572	ENDDO
	573	!
[709]	574	!-- Cyclic boundary conditions for ocean grid
[667]	575	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
	576	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
	577
	578	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
	579	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
	580
	581	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	582	target_id, tag, comm_inter, ierr )
	583
	584	ENDIF
	585
	586	CALL MPI_BARRIER( comm2d, ierr )
	587
[880]	588	#endif
	589
[667]	590	END SUBROUTINE interpolate_to_ocean

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