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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1336

Last change on this file since 1336 was 1325, checked in by suehring, 11 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	!
	23	! Former revisions:
	24	! -----------------
	25	! $Id: surface_coupler.f90 1325 2014-03-21 09:21:15Z raasch $
	26	!
[1325]	27	! 1324 2014-03-21 09:13:16Z suehring
	28	! Bugfix: ONLY statement for module pegrid removed
	29	!
[1323]	30	! 1322 2014-03-20 16:38:49Z raasch
	31	! REAL constants defined as wp-kind
	32	!
[1321]	33	! 1320 2014-03-20 08:40:49Z raasch
[1320]	34	! ONLY-attribute added to USE-statements,
	35	! kind-parameters added to all INTEGER and REAL declaration statements,
	36	! kinds are defined in new module kinds,
	37	! old module precision_kind is removed,
	38	! revision history before 2012 removed,
	39	! comment fields (!:) to be used for variable explanations added to
	40	! all variable declaration statements
[102]	41	!
[1319]	42	! 1318 2014-03-17 13:35:16Z raasch
	43	! module interfaces removed
	44	!
[1093]	45	! 1092 2013-02-02 11:24:22Z raasch
	46	! unused variables removed
	47	!
[1037]	48	! 1036 2012-10-22 13:43:42Z raasch
	49	! code put under GPL (PALM 3.9)
	50	!
[881]	51	! 880 2012-04-13 06:28:59Z raasch
	52	! Bugfix: preprocessor statements for parallel execution added
	53	!
[110]	54	! 109 2007-08-28 15:26:47Z letzel
[102]	55	! Initial revision
	56	!
	57	! Description:
	58	! ------------
	59	! Data exchange at the interface between coupled models
	60	!------------------------------------------------------------------------------!
	61
[1320]	62	USE arrays_3d, &
	63	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
	64	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
	65
	66	USE control_parameters, &
	67	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
	68	humidity, humidity_remote, message_string, terminate_coupled, &
	69	terminate_coupled_remote, time_since_reference_point
	70
	71	USE cpulog, &
	72	ONLY: cpu_log, log_point
	73
	74	USE indices, &
	75	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
	76	nysg, ny_a, ny_o, nzt
	77
	78	USE kinds
	79
[102]	80	USE pegrid
	81
	82	IMPLICIT NONE
	83
[1320]	84	REAL(wp) :: time_since_reference_point_rem !:
	85	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
[102]	86
[206]	87	#if defined( __parallel )
[102]	88
[667]	89	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	90
[667]	91
	92
[102]	93	!
[108]	94	!-- In case of model termination initiated by the remote model
	95	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
	96	!-- The rest of the coupler must then be skipped because it would cause an MPI
	97	!-- intercomminucation hang.
	98	!-- If necessary, the coupler will be called at the beginning of the next
	99	!-- restart run.
[667]	100
	101	IF ( coupling_topology == 0 ) THEN
[709]	102	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	103	0, &
	104	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
[667]	105	0, comm_inter, status, ierr )
	106	ELSE
	107	IF ( myid == 0) THEN
	108	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
	109	target_id, 0, &
	110	terminate_coupled_remote, 1, MPI_INTEGER, &
	111	target_id, 0, &
	112	comm_inter, status, ierr )
	113	ENDIF
[709]	114	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
	115	ierr )
[667]	116
	117	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
	118	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
	119
	120	ENDIF
	121
[108]	122	IF ( terminate_coupled_remote > 0 ) THEN
[274]	123	WRITE( message_string, * ) 'remote model "', &
	124	TRIM( coupling_mode_remote ), &
	125	'" terminated', &
	126	'&with terminate_coupled_remote = ', &
	127	terminate_coupled_remote, &
	128	'&local model "', TRIM( coupling_mode ), &
	129	'" has', &
	130	'&terminate_coupled = ', &
[667]	131	terminate_coupled
[258]	132	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	133	RETURN
	134	ENDIF
[667]	135
[291]	136
[108]	137	!
	138	!-- Exchange the current simulated time between the models,
[667]	139	!-- currently just for total_2ding
[709]	140	IF ( coupling_topology == 0 ) THEN
	141
	142	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
	143	comm_inter, ierr )
	144	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
	145	11, comm_inter, status, ierr )
[667]	146	ELSE
[709]	147
[667]	148	IF ( myid == 0 ) THEN
[709]	149
	150	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
	151	11, comm_inter, ierr )
	152	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
[667]	153	target_id, 11, comm_inter, status, ierr )
[709]	154
[667]	155	ENDIF
[709]	156
	157	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
	158	ierr )
	159
[667]	160	ENDIF
[102]	161
	162	!
	163	!-- Exchange the interface data
	164	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	165
	166	!
[709]	167	!-- Horizontal grid size and number of processors is equal in ocean and
	168	!-- atmosphere
	169	IF ( coupling_topology == 0 ) THEN
[102]	170
	171	!
[709]	172	!-- Send heat flux at bottom surface to the ocean
	173	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	174	comm_inter, ierr )
[102]	175	!
[709]	176	!-- Send humidity flux at bottom surface to the ocean
[667]	177	IF ( humidity ) THEN
[709]	178	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
	179	comm_inter, ierr )
[667]	180	ENDIF
	181	!
[709]	182	!-- Receive temperature at the bottom surface from the ocean
	183	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
	184	comm_inter, status, ierr )
[108]	185	!
[709]	186	!-- Send the momentum flux (u) at bottom surface to the ocean
	187	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	188	comm_inter, ierr )
[102]	189	!
[709]	190	!-- Send the momentum flux (v) at bottom surface to the ocean
	191	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	192	comm_inter, ierr )
[102]	193	!
[709]	194	!-- Receive u at the bottom surface from the ocean
	195	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
	196	comm_inter, status, ierr )
[667]	197	!
[709]	198	!-- Receive v at the bottom surface from the ocean
	199	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
	200	comm_inter, status, ierr )
[667]	201	!
	202	!-- Horizontal grid size or number of processors differs between
	203	!-- ocean and atmosphere
	204	ELSE
	205
	206	!
[709]	207	!-- Send heat flux at bottom surface to the ocean
[667]	208	total_2d_a = 0.0
[709]	209	total_2d = 0.0
[667]	210	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
[709]	211
	212	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	213	comm2d, ierr )
	214	CALL interpolate_to_ocean( 12 )
[667]	215	!
[709]	216	!-- Send humidity flux at bottom surface to the ocean
	217	IF ( humidity ) THEN
[667]	218	total_2d_a = 0.0
[709]	219	total_2d = 0.0
[667]	220	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
[709]	221
	222	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
	223	0, comm2d, ierr )
	224	CALL interpolate_to_ocean( 13 )
[667]	225	ENDIF
	226	!
[709]	227	!-- Receive temperature at the bottom surface from the ocean
	228	IF ( myid == 0 ) THEN
[667]	229	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	230	target_id, 14, comm_inter, status, ierr )
	231	ENDIF
	232	CALL MPI_BARRIER( comm2d, ierr )
[709]	233	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	234	ierr )
[667]	235	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	236	!
[709]	237	!-- Send momentum flux (u) at bottom surface to the ocean
[667]	238	total_2d_a = 0.0
[709]	239	total_2d = 0.0
[667]	240	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
[709]	241	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	242	comm2d, ierr )
	243	CALL interpolate_to_ocean( 15 )
[667]	244	!
[709]	245	!-- Send momentum flux (v) at bottom surface to the ocean
[667]	246	total_2d_a = 0.0
[709]	247	total_2d = 0.0
[667]	248	total_2d(nys:nyn,nxl:nxr) = vsws(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( 16 )
[667]	252	!
[709]	253	!-- Receive u at the bottom surface from the ocean
	254	IF ( myid == 0 ) THEN
[667]	255	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	256	target_id, 17, comm_inter, status, ierr )
[667]	257	ENDIF
	258	CALL MPI_BARRIER( comm2d, ierr )
[709]	259	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	260	ierr )
[667]	261	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	262	!
[709]	263	!-- Receive v at the bottom surface from the ocean
	264	IF ( myid == 0 ) THEN
[667]	265	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	266	target_id, 18, comm_inter, status, ierr )
[667]	267	ENDIF
	268	CALL MPI_BARRIER( comm2d, ierr )
[709]	269	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	270	ierr )
[667]	271	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	272
	273	ENDIF
	274
[102]	275	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	276
	277	!
[667]	278	!-- Horizontal grid size and number of processors is equal
	279	!-- in ocean and atmosphere
	280	IF ( coupling_topology == 0 ) THEN
	281	!
[709]	282	!-- Receive heat flux at the sea surface (top) from the atmosphere
	283	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	284	comm_inter, status, ierr )
[102]	285	!
[709]	286	!-- Receive humidity flux from the atmosphere (bottom)
[667]	287	!-- and add it to the heat flux at the sea surface (top)...
	288	IF ( humidity_remote ) THEN
	289	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
	290	target_id, 13, comm_inter, status, ierr )
	291	ENDIF
	292	!
	293	!-- Send sea surface temperature to the atmosphere model
[709]	294	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
	295	comm_inter, ierr )
[667]	296	!
	297	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
[709]	298	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	299	comm_inter, status, ierr )
[667]	300	!
	301	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
[709]	302	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	303	comm_inter, status, ierr )
[667]	304	!
[709]	305	!-- Send u to the atmosphere
	306	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
	307	comm_inter, ierr )
[667]	308	!
[709]	309	!-- Send v to the atmosphere
	310	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
	311	comm_inter, ierr )
	312	!
[667]	313	!-- Horizontal gridsize or number of processors differs between
	314	!-- ocean and atmosphere
	315	ELSE
	316	!
[709]	317	!-- Receive heat flux at the sea surface (top) from the atmosphere
	318	IF ( myid == 0 ) THEN
[667]	319	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	320	target_id, 12, comm_inter, status, ierr )
[667]	321	ENDIF
	322	CALL MPI_BARRIER( comm2d, ierr )
[709]	323	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	324	ierr )
[667]	325	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	326	!
[709]	327	!-- Receive humidity flux at the sea surface (top) from the atmosphere
	328	IF ( humidity_remote ) THEN
	329	IF ( myid == 0 ) THEN
[667]	330	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	331	target_id, 13, comm_inter, status, ierr )
[667]	332	ENDIF
	333	CALL MPI_BARRIER( comm2d, ierr )
[709]	334	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
	335	comm2d, ierr)
[667]	336	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	337	ENDIF
	338	!
	339	!-- Send surface temperature to atmosphere
	340	total_2d_o = 0.0
[709]	341	total_2d = 0.0
[667]	342	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	343
[709]	344	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	345	comm2d, ierr)
	346	CALL interpolate_to_atmos( 14 )
[667]	347	!
[709]	348	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	349	IF ( myid == 0 ) THEN
[667]	350	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	351	target_id, 15, comm_inter, status, ierr )
[667]	352	ENDIF
	353	CALL MPI_BARRIER( comm2d, ierr )
	354	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	355	0, comm2d, ierr )
[667]	356	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	357	!
[709]	358	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
	359	IF ( myid == 0 ) THEN
[667]	360	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	361	target_id, 16, comm_inter, status, ierr )
[667]	362	ENDIF
	363	CALL MPI_BARRIER( comm2d, ierr )
[709]	364	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	365	ierr )
[667]	366	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	367	!
	368	!-- Send u to atmosphere
	369	total_2d_o = 0.0
[709]	370	total_2d = 0.0
[667]	371	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
[709]	372	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	373	comm2d, ierr )
	374	CALL interpolate_to_atmos( 17 )
[667]	375	!
	376	!-- Send v to atmosphere
	377	total_2d_o = 0.0
[709]	378	total_2d = 0.0
[667]	379	total_2d(nys:nyn,nxl:nxr) = v(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( 18 )
[667]	383
	384	ENDIF
	385
	386	!
	387	!-- Conversions of fluxes received from atmosphere
	388	IF ( humidity_remote ) THEN
[108]	389	!
[709]	390	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
	391	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	392	!-- /(rho_atm(=1.0)*c_p)
[1322]	393	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
[709]	394	!
[667]	395	!-- ...and convert it to a salinity flux at the sea surface (top)
[108]	396	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
	397	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
	398	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
[667]	399	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
[108]	400	ENDIF
	401
	402	!
[102]	403	!-- Adjust the kinematic heat flux with respect to ocean density
	404	!-- (constants are the specific heat capacities for air and water)
[667]	405	!-- now tswst is the ocean top heat flux
[1322]	406	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
[102]	407
	408	!
[667]	409	!-- Adjust the momentum fluxes with respect to ocean density
	410	uswst = uswst / rho(nzt,:,:)
	411	vswst = vswst / rho(nzt,:,:)
[102]	412
[667]	413	ENDIF
	414
[709]	415	IF ( coupling_topology == 1 ) THEN
[667]	416	DEALLOCATE( total_2d_o, total_2d_a )
	417	ENDIF
	418
	419	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
	420
	421	#endif
	422
	423	END SUBROUTINE surface_coupler
	424
	425
	426
[709]	427	SUBROUTINE interpolate_to_atmos( tag )
[667]	428
[880]	429	#if defined( __parallel )
	430
[1320]	431	USE arrays_3d, &
	432	ONLY: total_2d_a, total_2d_o
[667]	433
[1320]	434	USE indices, &
	435	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	436
	437	USE kinds
	438
[1324]	439	USE pegrid
[1320]	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
[1324]	523	USE pegrid
[1320]	524
[667]	525	IMPLICIT NONE
	526
[1320]	527	INTEGER(iwp) :: dnx !:
	528	INTEGER(iwp) :: dny !:
	529	INTEGER(iwp) :: i !:
	530	INTEGER(iwp) :: ii !:
	531	INTEGER(iwp) :: j !:
	532	INTEGER(iwp) :: jj !:
	533	INTEGER(iwp), intent(in) :: tag !:
[667]	534
[1320]	535	REAL(wp) :: fl !:
	536	REAL(wp) :: fr !:
	537	REAL(wp) :: myl !:
	538	REAL(wp) :: myr !:
[709]	539
[667]	540	CALL MPI_BARRIER( comm2d, ierr )
	541
[709]	542	IF ( myid == 0 ) THEN
[667]	543
	544	!
[709]	545	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
[667]	546	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	547	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	548
	549	!
[709]	550	!-- Cyclic boundary conditions for atmosphere grid
[667]	551	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
	552	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
	553
	554	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
	555	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
	556	!
[709]	557	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
[667]	558	DO j = 0, ny
	559	DO i = 0, nx
	560	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
	561	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
	562	DO jj = 0, dny-1
[709]	563	fl = myl*jj + total_2d_a(j,i)
	564	fr = myr*jj + total_2d_a(j,i+1)
[667]	565	DO ii = 0, dnx-1
	566	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
	567	ENDDO
	568	ENDDO
	569	ENDDO
	570	ENDDO
	571	!
[709]	572	!-- Cyclic boundary conditions for ocean grid
[667]	573	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
	574	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
	575
	576	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
	577	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
	578
	579	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	580	target_id, tag, comm_inter, ierr )
	581
	582	ENDIF
	583
	584	CALL MPI_BARRIER( comm2d, ierr )
	585
[880]	586	#endif
	587
[667]	588	END SUBROUTINE interpolate_to_ocean

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