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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1412

Last change on this file since 1412 was 1354, checked in by heinze, 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	!
[1354]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: surface_coupler.f90 1354 2014-04-08 15:22:57Z suehring $
	27	!
[1354]	28	! 1353 2014-04-08 15:21:23Z heinze
	29	! REAL constants provided with KIND-attribute
	30	!
[1325]	31	! 1324 2014-03-21 09:13:16Z suehring
	32	! Bugfix: ONLY statement for module pegrid removed
	33	!
[1323]	34	! 1322 2014-03-20 16:38:49Z raasch
	35	! REAL constants defined as wp-kind
	36	!
[1321]	37	! 1320 2014-03-20 08:40:49Z raasch
[1320]	38	! ONLY-attribute added to USE-statements,
	39	! kind-parameters added to all INTEGER and REAL declaration statements,
	40	! kinds are defined in new module kinds,
	41	! old module precision_kind is removed,
	42	! revision history before 2012 removed,
	43	! comment fields (!:) to be used for variable explanations added to
	44	! all variable declaration statements
[102]	45	!
[1319]	46	! 1318 2014-03-17 13:35:16Z raasch
	47	! module interfaces removed
	48	!
[1093]	49	! 1092 2013-02-02 11:24:22Z raasch
	50	! unused variables removed
	51	!
[1037]	52	! 1036 2012-10-22 13:43:42Z raasch
	53	! code put under GPL (PALM 3.9)
	54	!
[881]	55	! 880 2012-04-13 06:28:59Z raasch
	56	! Bugfix: preprocessor statements for parallel execution added
	57	!
[110]	58	! 109 2007-08-28 15:26:47Z letzel
[102]	59	! Initial revision
	60	!
	61	! Description:
	62	! ------------
	63	! Data exchange at the interface between coupled models
	64	!------------------------------------------------------------------------------!
	65
[1320]	66	USE arrays_3d, &
	67	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
	68	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
	69
	70	USE control_parameters, &
	71	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
	72	humidity, humidity_remote, message_string, terminate_coupled, &
	73	terminate_coupled_remote, time_since_reference_point
	74
	75	USE cpulog, &
	76	ONLY: cpu_log, log_point
	77
	78	USE indices, &
	79	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
	80	nysg, ny_a, ny_o, nzt
	81
	82	USE kinds
	83
[102]	84	USE pegrid
	85
	86	IMPLICIT NONE
	87
[1320]	88	REAL(wp) :: time_since_reference_point_rem !:
	89	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
[102]	90
[206]	91	#if defined( __parallel )
[102]	92
[667]	93	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	94
[667]	95
	96
[102]	97	!
[108]	98	!-- In case of model termination initiated by the remote model
	99	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
	100	!-- The rest of the coupler must then be skipped because it would cause an MPI
	101	!-- intercomminucation hang.
	102	!-- If necessary, the coupler will be called at the beginning of the next
	103	!-- restart run.
[667]	104
	105	IF ( coupling_topology == 0 ) THEN
[709]	106	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	107	0, &
	108	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
[667]	109	0, comm_inter, status, ierr )
	110	ELSE
	111	IF ( myid == 0) THEN
	112	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
	113	target_id, 0, &
	114	terminate_coupled_remote, 1, MPI_INTEGER, &
	115	target_id, 0, &
	116	comm_inter, status, ierr )
	117	ENDIF
[709]	118	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
	119	ierr )
[667]	120
	121	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
	122	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
	123
	124	ENDIF
	125
[108]	126	IF ( terminate_coupled_remote > 0 ) THEN
[274]	127	WRITE( message_string, * ) 'remote model "', &
	128	TRIM( coupling_mode_remote ), &
	129	'" terminated', &
	130	'&with terminate_coupled_remote = ', &
	131	terminate_coupled_remote, &
	132	'&local model "', TRIM( coupling_mode ), &
	133	'" has', &
	134	'&terminate_coupled = ', &
[667]	135	terminate_coupled
[258]	136	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	137	RETURN
	138	ENDIF
[667]	139
[291]	140
[108]	141	!
	142	!-- Exchange the current simulated time between the models,
[667]	143	!-- currently just for total_2ding
[709]	144	IF ( coupling_topology == 0 ) THEN
	145
	146	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
	147	comm_inter, ierr )
	148	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
	149	11, comm_inter, status, ierr )
[667]	150	ELSE
[709]	151
[667]	152	IF ( myid == 0 ) THEN
[709]	153
	154	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
	155	11, comm_inter, ierr )
	156	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
[667]	157	target_id, 11, comm_inter, status, ierr )
[709]	158
[667]	159	ENDIF
[709]	160
	161	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
	162	ierr )
	163
[667]	164	ENDIF
[102]	165
	166	!
	167	!-- Exchange the interface data
	168	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	169
	170	!
[709]	171	!-- Horizontal grid size and number of processors is equal in ocean and
	172	!-- atmosphere
	173	IF ( coupling_topology == 0 ) THEN
[102]	174
	175	!
[709]	176	!-- Send heat flux at bottom surface to the ocean
	177	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	178	comm_inter, ierr )
[102]	179	!
[709]	180	!-- Send humidity flux at bottom surface to the ocean
[667]	181	IF ( humidity ) THEN
[709]	182	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
	183	comm_inter, ierr )
[667]	184	ENDIF
	185	!
[709]	186	!-- Receive temperature at the bottom surface from the ocean
	187	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
	188	comm_inter, status, ierr )
[108]	189	!
[709]	190	!-- Send the momentum flux (u) at bottom surface to the ocean
	191	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	192	comm_inter, ierr )
[102]	193	!
[709]	194	!-- Send the momentum flux (v) at bottom surface to the ocean
	195	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	196	comm_inter, ierr )
[102]	197	!
[709]	198	!-- Receive u at the bottom surface from the ocean
	199	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
	200	comm_inter, status, ierr )
[667]	201	!
[709]	202	!-- Receive v at the bottom surface from the ocean
	203	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
	204	comm_inter, status, ierr )
[667]	205	!
	206	!-- Horizontal grid size or number of processors differs between
	207	!-- ocean and atmosphere
	208	ELSE
	209
	210	!
[709]	211	!-- Send heat flux at bottom surface to the ocean
[1353]	212	total_2d_a = 0.0_wp
	213	total_2d = 0.0_wp
[667]	214	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
[709]	215
	216	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	217	comm2d, ierr )
	218	CALL interpolate_to_ocean( 12 )
[667]	219	!
[709]	220	!-- Send humidity flux at bottom surface to the ocean
	221	IF ( humidity ) THEN
[1353]	222	total_2d_a = 0.0_wp
	223	total_2d = 0.0_wp
[667]	224	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
[709]	225
	226	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
	227	0, comm2d, ierr )
	228	CALL interpolate_to_ocean( 13 )
[667]	229	ENDIF
	230	!
[709]	231	!-- Receive temperature at the bottom surface from the ocean
	232	IF ( myid == 0 ) THEN
[667]	233	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	234	target_id, 14, comm_inter, status, ierr )
	235	ENDIF
	236	CALL MPI_BARRIER( comm2d, ierr )
[709]	237	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	238	ierr )
[667]	239	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	240	!
[709]	241	!-- Send momentum flux (u) at bottom surface to the ocean
[1353]	242	total_2d_a = 0.0_wp
	243	total_2d = 0.0_wp
[667]	244	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
[709]	245	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	246	comm2d, ierr )
	247	CALL interpolate_to_ocean( 15 )
[667]	248	!
[709]	249	!-- Send momentum flux (v) at bottom surface to the ocean
[1353]	250	total_2d_a = 0.0_wp
	251	total_2d = 0.0_wp
[667]	252	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
[709]	253	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	254	comm2d, ierr )
	255	CALL interpolate_to_ocean( 16 )
[667]	256	!
[709]	257	!-- Receive u at the bottom surface from the ocean
	258	IF ( myid == 0 ) THEN
[667]	259	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	260	target_id, 17, comm_inter, status, ierr )
[667]	261	ENDIF
	262	CALL MPI_BARRIER( comm2d, ierr )
[709]	263	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	264	ierr )
[667]	265	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	266	!
[709]	267	!-- Receive v at the bottom surface from the ocean
	268	IF ( myid == 0 ) THEN
[667]	269	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	270	target_id, 18, comm_inter, status, ierr )
[667]	271	ENDIF
	272	CALL MPI_BARRIER( comm2d, ierr )
[709]	273	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	274	ierr )
[667]	275	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	276
	277	ENDIF
	278
[102]	279	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	280
	281	!
[667]	282	!-- Horizontal grid size and number of processors is equal
	283	!-- in ocean and atmosphere
	284	IF ( coupling_topology == 0 ) THEN
	285	!
[709]	286	!-- Receive heat flux at the sea surface (top) from the atmosphere
	287	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	288	comm_inter, status, ierr )
[102]	289	!
[709]	290	!-- Receive humidity flux from the atmosphere (bottom)
[667]	291	!-- and add it to the heat flux at the sea surface (top)...
	292	IF ( humidity_remote ) THEN
	293	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
	294	target_id, 13, comm_inter, status, ierr )
	295	ENDIF
	296	!
	297	!-- Send sea surface temperature to the atmosphere model
[709]	298	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
	299	comm_inter, ierr )
[667]	300	!
	301	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
[709]	302	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	303	comm_inter, status, ierr )
[667]	304	!
	305	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
[709]	306	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	307	comm_inter, status, ierr )
[667]	308	!
[709]	309	!-- Send u to the atmosphere
	310	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
	311	comm_inter, ierr )
[667]	312	!
[709]	313	!-- Send v to the atmosphere
	314	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
	315	comm_inter, ierr )
	316	!
[667]	317	!-- Horizontal gridsize or number of processors differs between
	318	!-- ocean and atmosphere
	319	ELSE
	320	!
[709]	321	!-- Receive heat flux at the sea surface (top) from the atmosphere
	322	IF ( myid == 0 ) THEN
[667]	323	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	324	target_id, 12, comm_inter, status, ierr )
[667]	325	ENDIF
	326	CALL MPI_BARRIER( comm2d, ierr )
[709]	327	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	328	ierr )
[667]	329	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	330	!
[709]	331	!-- Receive humidity flux at the sea surface (top) from the atmosphere
	332	IF ( humidity_remote ) THEN
	333	IF ( myid == 0 ) THEN
[667]	334	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	335	target_id, 13, comm_inter, status, ierr )
[667]	336	ENDIF
	337	CALL MPI_BARRIER( comm2d, ierr )
[709]	338	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
	339	comm2d, ierr)
[667]	340	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	341	ENDIF
	342	!
	343	!-- Send surface temperature to atmosphere
[1353]	344	total_2d_o = 0.0_wp
	345	total_2d = 0.0_wp
[667]	346	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	347
[709]	348	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	349	comm2d, ierr)
	350	CALL interpolate_to_atmos( 14 )
[667]	351	!
[709]	352	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	353	IF ( myid == 0 ) THEN
[667]	354	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	355	target_id, 15, comm_inter, status, ierr )
[667]	356	ENDIF
	357	CALL MPI_BARRIER( comm2d, ierr )
	358	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	359	0, comm2d, ierr )
[667]	360	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	361	!
[709]	362	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
	363	IF ( myid == 0 ) THEN
[667]	364	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	365	target_id, 16, comm_inter, status, ierr )
[667]	366	ENDIF
	367	CALL MPI_BARRIER( comm2d, ierr )
[709]	368	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	369	ierr )
[667]	370	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	371	!
	372	!-- Send u to atmosphere
[1353]	373	total_2d_o = 0.0_wp
	374	total_2d = 0.0_wp
[667]	375	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
[709]	376	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	377	comm2d, ierr )
	378	CALL interpolate_to_atmos( 17 )
[667]	379	!
	380	!-- Send v to atmosphere
[1353]	381	total_2d_o = 0.0_wp
	382	total_2d = 0.0_wp
[667]	383	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
[709]	384	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	385	comm2d, ierr )
	386	CALL interpolate_to_atmos( 18 )
[667]	387
	388	ENDIF
	389
	390	!
	391	!-- Conversions of fluxes received from atmosphere
	392	IF ( humidity_remote ) THEN
[108]	393	!
[709]	394	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
	395	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	396	!-- /(rho_atm(=1.0)*c_p)
[1322]	397	tswst = tswst + qswst_remote * 2.2626108E6_wp / 1005.0_wp
[709]	398	!
[667]	399	!-- ...and convert it to a salinity flux at the sea surface (top)
[108]	400	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
	401	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
[1353]	402	saswst = -1.0_wp * sa(nzt,:,:) * qswst_remote / &
	403	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) ) )
[108]	404	ENDIF
	405
	406	!
[102]	407	!-- Adjust the kinematic heat flux with respect to ocean density
	408	!-- (constants are the specific heat capacities for air and water)
[667]	409	!-- now tswst is the ocean top heat flux
[1322]	410	tswst = tswst / rho(nzt,:,:) * 1005.0_wp / 4218.0_wp
[102]	411
	412	!
[667]	413	!-- Adjust the momentum fluxes with respect to ocean density
	414	uswst = uswst / rho(nzt,:,:)
	415	vswst = vswst / rho(nzt,:,:)
[102]	416
[667]	417	ENDIF
	418
[709]	419	IF ( coupling_topology == 1 ) THEN
[667]	420	DEALLOCATE( total_2d_o, total_2d_a )
	421	ENDIF
	422
	423	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
	424
	425	#endif
	426
	427	END SUBROUTINE surface_coupler
	428
	429
	430
[709]	431	SUBROUTINE interpolate_to_atmos( tag )
[667]	432
[880]	433	#if defined( __parallel )
	434
[1320]	435	USE arrays_3d, &
	436	ONLY: total_2d_a, total_2d_o
[667]	437
[1320]	438	USE indices, &
	439	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	440
	441	USE kinds
	442
[1324]	443	USE pegrid
[1320]	444
[667]	445	IMPLICIT NONE
	446
[1320]	447	INTEGER(iwp) :: dnx !:
	448	INTEGER(iwp) :: dnx2 !:
	449	INTEGER(iwp) :: dny !:
	450	INTEGER(iwp) :: dny2 !:
	451	INTEGER(iwp) :: i !:
	452	INTEGER(iwp) :: ii !:
	453	INTEGER(iwp) :: j !:
	454	INTEGER(iwp) :: jj !:
[667]	455
[1320]	456	INTEGER(iwp), intent(in) :: tag !:
	457
[667]	458	CALL MPI_BARRIER( comm2d, ierr )
	459
[709]	460	IF ( myid == 0 ) THEN
	461	!
	462	!-- Cyclic boundary conditions for the total 2D-grid
[667]	463	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
	464	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
	465
	466	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
	467	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
	468
[102]	469	!
[667]	470	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
	471	dnx = (nx_o+1) / (nx_a+1)
	472	dny = (ny_o+1) / (ny_a+1)
[102]	473
	474	!
[709]	475	!-- Distance for interpolation around coarse grid points within the fine
	476	!-- grid (note: 2*dnx2 must not be equal with dnx)
[667]	477	dnx2 = 2 * ( dnx / 2 )
	478	dny2 = 2 * ( dny / 2 )
[102]	479
[1353]	480	total_2d_a = 0.0_wp
[102]	481	!
[667]	482	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
	483	DO j = 0, ny_a
	484	DO i = 0, nx_a
	485	DO jj = 0, dny2
	486	DO ii = 0, dnx2
	487	total_2d_a(j,i) = total_2d_a(j,i) &
	488	+ total_2d_o(jdny+jj,idnx+ii)
	489	ENDDO
	490	ENDDO
	491	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
	492	ENDDO
	493	ENDDO
	494	!
[709]	495	!-- Cyclic boundary conditions for atmosphere grid
[667]	496	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
	497	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
	498
	499	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
	500	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
	501	!
	502	!-- Transfer of the atmosphere-grid-layer to the atmosphere
[709]	503	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
	504	tag, comm_inter, ierr )
[102]	505
	506	ENDIF
	507
[667]	508	CALL MPI_BARRIER( comm2d, ierr )
[102]	509
[880]	510	#endif
	511
[667]	512	END SUBROUTINE interpolate_to_atmos
[102]	513
[667]	514
[709]	515	SUBROUTINE interpolate_to_ocean( tag )
[667]	516
[880]	517	#if defined( __parallel )
	518
[1320]	519	USE arrays_3d, &
	520	ONLY: total_2d_a, total_2d_o
[667]	521
[1320]	522	USE indices, &
	523	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	524
	525	USE kinds
	526
[1324]	527	USE pegrid
[1320]	528
[667]	529	IMPLICIT NONE
	530
[1320]	531	INTEGER(iwp) :: dnx !:
	532	INTEGER(iwp) :: dny !:
	533	INTEGER(iwp) :: i !:
	534	INTEGER(iwp) :: ii !:
	535	INTEGER(iwp) :: j !:
	536	INTEGER(iwp) :: jj !:
	537	INTEGER(iwp), intent(in) :: tag !:
[667]	538
[1320]	539	REAL(wp) :: fl !:
	540	REAL(wp) :: fr !:
	541	REAL(wp) :: myl !:
	542	REAL(wp) :: myr !:
[709]	543
[667]	544	CALL MPI_BARRIER( comm2d, ierr )
	545
[709]	546	IF ( myid == 0 ) THEN
[667]	547
	548	!
[709]	549	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
[667]	550	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	551	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	552
	553	!
[709]	554	!-- Cyclic boundary conditions for atmosphere grid
[667]	555	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
	556	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
	557
	558	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
	559	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
	560	!
[709]	561	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
[667]	562	DO j = 0, ny
	563	DO i = 0, nx
	564	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
	565	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
	566	DO jj = 0, dny-1
[709]	567	fl = myl*jj + total_2d_a(j,i)
	568	fr = myr*jj + total_2d_a(j,i+1)
[667]	569	DO ii = 0, dnx-1
	570	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
	571	ENDDO
	572	ENDDO
	573	ENDDO
	574	ENDDO
	575	!
[709]	576	!-- Cyclic boundary conditions for ocean grid
[667]	577	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
	578	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
	579
	580	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
	581	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
	582
	583	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	584	target_id, tag, comm_inter, ierr )
	585
	586	ENDIF
	587
	588	CALL MPI_BARRIER( comm2d, ierr )
	589
[880]	590	#endif
	591
[667]	592	END SUBROUTINE interpolate_to_ocean

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