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source: palm/trunk/SOURCE/surface_coupler.f90 @ 1673

Last change on this file since 1673 was 1428, checked in by maronga, 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	!
[1428]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: surface_coupler.f90 1428 2014-07-07 14:06:05Z raasch $
	27	!
[1428]	28	! 1427 2014-07-07 14:04:59Z maronga
	29	! Bugfix: value of l_v corrected.
	30	!
[1419]	31	! 1418 2014-06-06 13:05:08Z fricke
	32	! Bugfix: For caluclation of the salinity flux at the sea surface,
	33	! the given value for salinity must be in percent and not in psu
	34	!
[1354]	35	! 1353 2014-04-08 15:21:23Z heinze
	36	! REAL constants provided with KIND-attribute
	37	!
[1325]	38	! 1324 2014-03-21 09:13:16Z suehring
	39	! Bugfix: ONLY statement for module pegrid removed
	40	!
[1323]	41	! 1322 2014-03-20 16:38:49Z raasch
	42	! REAL constants defined as wp-kind
	43	!
[1321]	44	! 1320 2014-03-20 08:40:49Z raasch
[1320]	45	! ONLY-attribute added to USE-statements,
	46	! kind-parameters added to all INTEGER and REAL declaration statements,
	47	! kinds are defined in new module kinds,
	48	! old module precision_kind is removed,
	49	! revision history before 2012 removed,
	50	! comment fields (!:) to be used for variable explanations added to
	51	! all variable declaration statements
[102]	52	!
[1319]	53	! 1318 2014-03-17 13:35:16Z raasch
	54	! module interfaces removed
	55	!
[1093]	56	! 1092 2013-02-02 11:24:22Z raasch
	57	! unused variables removed
	58	!
[1037]	59	! 1036 2012-10-22 13:43:42Z raasch
	60	! code put under GPL (PALM 3.9)
	61	!
[881]	62	! 880 2012-04-13 06:28:59Z raasch
	63	! Bugfix: preprocessor statements for parallel execution added
	64	!
[110]	65	! 109 2007-08-28 15:26:47Z letzel
[102]	66	! Initial revision
	67	!
	68	! Description:
	69	! ------------
	70	! Data exchange at the interface between coupled models
	71	!------------------------------------------------------------------------------!
	72
[1320]	73	USE arrays_3d, &
	74	ONLY: pt, shf, qsws, qswst_remote, rho, sa, saswst, total_2d_a, &
	75	total_2d_o, tswst, u, usws, uswst, v, vsws, vswst
	76
[1427]	77	USE cloud_parameters, &
	78	ONLY: cp, l_v
	79
[1320]	80	USE control_parameters, &
	81	ONLY: coupling_mode, coupling_mode_remote, coupling_topology, &
	82	humidity, humidity_remote, message_string, terminate_coupled, &
	83	terminate_coupled_remote, time_since_reference_point
	84
	85	USE cpulog, &
	86	ONLY: cpu_log, log_point
	87
	88	USE indices, &
	89	ONLY: nbgp, nx, nxl, nxlg, nxr, nxrg, nx_a, nx_o, ny, nyn, nyng, nys, &
	90	nysg, ny_a, ny_o, nzt
	91
	92	USE kinds
	93
[102]	94	USE pegrid
	95
	96	IMPLICIT NONE
	97
[1320]	98	REAL(wp) :: time_since_reference_point_rem !:
	99	REAL(wp) :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp) !:
[102]	100
[1427]	101	REAL(wp) :: cpw = 4218.0_wp !: heat capacity of water at constant pressure
	102
[206]	103	#if defined( __parallel )
[102]	104
[667]	105	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	106
[667]	107
	108
[102]	109	!
[108]	110	!-- In case of model termination initiated by the remote model
	111	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
	112	!-- The rest of the coupler must then be skipped because it would cause an MPI
	113	!-- intercomminucation hang.
	114	!-- If necessary, the coupler will be called at the beginning of the next
	115	!-- restart run.
[667]	116
	117	IF ( coupling_topology == 0 ) THEN
[709]	118	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	119	0, &
	120	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
[667]	121	0, comm_inter, status, ierr )
	122	ELSE
	123	IF ( myid == 0) THEN
	124	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
	125	target_id, 0, &
	126	terminate_coupled_remote, 1, MPI_INTEGER, &
	127	target_id, 0, &
	128	comm_inter, status, ierr )
	129	ENDIF
[709]	130	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, &
	131	ierr )
[667]	132
	133	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
	134	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
	135
	136	ENDIF
	137
[108]	138	IF ( terminate_coupled_remote > 0 ) THEN
[274]	139	WRITE( message_string, * ) 'remote model "', &
	140	TRIM( coupling_mode_remote ), &
	141	'" terminated', &
	142	'&with terminate_coupled_remote = ', &
	143	terminate_coupled_remote, &
	144	'&local model "', TRIM( coupling_mode ), &
	145	'" has', &
	146	'&terminate_coupled = ', &
[667]	147	terminate_coupled
[258]	148	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	149	RETURN
	150	ENDIF
[667]	151
[291]	152
[108]	153	!
	154	!-- Exchange the current simulated time between the models,
[667]	155	!-- currently just for total_2ding
[709]	156	IF ( coupling_topology == 0 ) THEN
	157
	158	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, 11, &
	159	comm_inter, ierr )
	160	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, target_id, &
	161	11, comm_inter, status, ierr )
[667]	162	ELSE
[709]	163
[667]	164	IF ( myid == 0 ) THEN
[709]	165
	166	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, target_id, &
	167	11, comm_inter, ierr )
	168	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
[667]	169	target_id, 11, comm_inter, status, ierr )
[709]	170
[667]	171	ENDIF
[709]	172
	173	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, 0, comm2d, &
	174	ierr )
	175
[667]	176	ENDIF
[102]	177
	178	!
	179	!-- Exchange the interface data
	180	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	181
	182	!
[709]	183	!-- Horizontal grid size and number of processors is equal in ocean and
	184	!-- atmosphere
	185	IF ( coupling_topology == 0 ) THEN
[102]	186
	187	!
[709]	188	!-- Send heat flux at bottom surface to the ocean
	189	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	190	comm_inter, ierr )
[102]	191	!
[709]	192	!-- Send humidity flux at bottom surface to the ocean
[667]	193	IF ( humidity ) THEN
[709]	194	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 13, &
	195	comm_inter, ierr )
[667]	196	ENDIF
	197	!
[709]	198	!-- Receive temperature at the bottom surface from the ocean
	199	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, target_id, 14, &
	200	comm_inter, status, ierr )
[108]	201	!
[709]	202	!-- Send the momentum flux (u) at bottom surface to the ocean
	203	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	204	comm_inter, ierr )
[102]	205	!
[709]	206	!-- Send the momentum flux (v) at bottom surface to the ocean
	207	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	208	comm_inter, ierr )
[102]	209	!
[709]	210	!-- Receive u at the bottom surface from the ocean
	211	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, target_id, 17, &
	212	comm_inter, status, ierr )
[667]	213	!
[709]	214	!-- Receive v at the bottom surface from the ocean
	215	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, target_id, 18, &
	216	comm_inter, status, ierr )
[667]	217	!
	218	!-- Horizontal grid size or number of processors differs between
	219	!-- ocean and atmosphere
	220	ELSE
	221
	222	!
[709]	223	!-- Send heat flux at bottom surface to the ocean
[1353]	224	total_2d_a = 0.0_wp
	225	total_2d = 0.0_wp
[667]	226	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
[709]	227
	228	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	229	comm2d, ierr )
	230	CALL interpolate_to_ocean( 12 )
[667]	231	!
[709]	232	!-- Send humidity flux at bottom surface to the ocean
	233	IF ( humidity ) THEN
[1353]	234	total_2d_a = 0.0_wp
	235	total_2d = 0.0_wp
[667]	236	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
[709]	237
	238	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, &
	239	0, comm2d, ierr )
	240	CALL interpolate_to_ocean( 13 )
[667]	241	ENDIF
	242	!
[709]	243	!-- Receive temperature at the bottom surface from the ocean
	244	IF ( myid == 0 ) THEN
[667]	245	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	246	target_id, 14, comm_inter, status, ierr )
	247	ENDIF
	248	CALL MPI_BARRIER( comm2d, ierr )
[709]	249	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	250	ierr )
[667]	251	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	252	!
[709]	253	!-- Send momentum flux (u) 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) = usws(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( 15 )
[667]	260	!
[709]	261	!-- Send momentum flux (v) at bottom surface to the ocean
[1353]	262	total_2d_a = 0.0_wp
	263	total_2d = 0.0_wp
[667]	264	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
[709]	265	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, MPI_SUM, 0, &
	266	comm2d, ierr )
	267	CALL interpolate_to_ocean( 16 )
[667]	268	!
[709]	269	!-- Receive u at the bottom surface from the ocean
	270	IF ( myid == 0 ) THEN
[667]	271	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	272	target_id, 17, comm_inter, status, ierr )
[667]	273	ENDIF
	274	CALL MPI_BARRIER( comm2d, ierr )
[709]	275	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	276	ierr )
[667]	277	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	278	!
[709]	279	!-- Receive v at the bottom surface from the ocean
	280	IF ( myid == 0 ) THEN
[667]	281	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
[709]	282	target_id, 18, comm_inter, status, ierr )
[667]	283	ENDIF
	284	CALL MPI_BARRIER( comm2d, ierr )
[709]	285	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, 0, comm2d, &
	286	ierr )
[667]	287	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	288
	289	ENDIF
	290
[102]	291	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	292
	293	!
[667]	294	!-- Horizontal grid size and number of processors is equal
	295	!-- in ocean and atmosphere
	296	IF ( coupling_topology == 0 ) THEN
	297	!
[709]	298	!-- Receive heat flux at the sea surface (top) from the atmosphere
	299	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 12, &
	300	comm_inter, status, ierr )
[102]	301	!
[709]	302	!-- Receive humidity flux from the atmosphere (bottom)
[667]	303	!-- and add it to the heat flux at the sea surface (top)...
	304	IF ( humidity_remote ) THEN
	305	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
	306	target_id, 13, comm_inter, status, ierr )
	307	ENDIF
	308	!
	309	!-- Send sea surface temperature to the atmosphere model
[709]	310	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, target_id, 14, &
	311	comm_inter, ierr )
[667]	312	!
	313	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
[709]	314	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 15, &
	315	comm_inter, status, ierr )
[667]	316	!
	317	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
[709]	318	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, target_id, 16, &
	319	comm_inter, status, ierr )
[667]	320	!
[709]	321	!-- Send u to the atmosphere
	322	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, target_id, 17, &
	323	comm_inter, ierr )
[667]	324	!
[709]	325	!-- Send v to the atmosphere
	326	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, target_id, 18, &
	327	comm_inter, ierr )
	328	!
[667]	329	!-- Horizontal gridsize or number of processors differs between
	330	!-- ocean and atmosphere
	331	ELSE
	332	!
[709]	333	!-- Receive heat flux at the sea surface (top) from the atmosphere
	334	IF ( myid == 0 ) THEN
[667]	335	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	336	target_id, 12, comm_inter, status, ierr )
[667]	337	ENDIF
	338	CALL MPI_BARRIER( comm2d, ierr )
[709]	339	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	340	ierr )
[667]	341	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	342	!
[709]	343	!-- Receive humidity flux at the sea surface (top) from the atmosphere
	344	IF ( humidity_remote ) THEN
	345	IF ( myid == 0 ) THEN
[667]	346	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	347	target_id, 13, comm_inter, status, ierr )
[667]	348	ENDIF
	349	CALL MPI_BARRIER( comm2d, ierr )
[709]	350	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, &
	351	comm2d, ierr)
[667]	352	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	353	ENDIF
	354	!
	355	!-- Send surface temperature to atmosphere
[1353]	356	total_2d_o = 0.0_wp
	357	total_2d = 0.0_wp
[667]	358	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	359
[709]	360	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	361	comm2d, ierr)
	362	CALL interpolate_to_atmos( 14 )
[667]	363	!
[709]	364	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	365	IF ( myid == 0 ) THEN
[667]	366	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	367	target_id, 15, comm_inter, status, ierr )
[667]	368	ENDIF
	369	CALL MPI_BARRIER( comm2d, ierr )
	370	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	371	0, comm2d, ierr )
[667]	372	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	373	!
[709]	374	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
	375	IF ( myid == 0 ) THEN
[667]	376	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
[709]	377	target_id, 16, comm_inter, status, ierr )
[667]	378	ENDIF
	379	CALL MPI_BARRIER( comm2d, ierr )
[709]	380	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, 0, comm2d, &
	381	ierr )
[667]	382	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	383	!
	384	!-- Send u to atmosphere
[1353]	385	total_2d_o = 0.0_wp
	386	total_2d = 0.0_wp
[667]	387	total_2d(nys:nyn,nxl:nxr) = u(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( 17 )
[667]	391	!
	392	!-- Send v to atmosphere
[1353]	393	total_2d_o = 0.0_wp
	394	total_2d = 0.0_wp
[667]	395	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
[709]	396	CALL MPI_REDUCE( total_2d, total_2d_o, ngp_o, MPI_REAL, MPI_SUM, 0, &
	397	comm2d, ierr )
	398	CALL interpolate_to_atmos( 18 )
[667]	399
	400	ENDIF
	401
	402	!
	403	!-- Conversions of fluxes received from atmosphere
	404	IF ( humidity_remote ) THEN
[108]	405	!
[709]	406	!-- Here tswst is still the sum of atmospheric bottom heat fluxes,
	407	!-- * latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	408	!-- /(rho_atm(=1.0)*c_p)
[1427]	409	tswst = tswst + qswst_remote * l_v / cp
[709]	410	!
[667]	411	!-- ...and convert it to a salinity flux at the sea surface (top)
[108]	412	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
	413	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
[1427]	414	saswst = -1.0_wp * sa(nzt,:,:) * 0.001_wp * qswst_remote / &
	415	( rho(nzt,:,:) * ( 1.0_wp - sa(nzt,:,:) * 0.001_wp ) )
[108]	416	ENDIF
	417
	418	!
[102]	419	!-- Adjust the kinematic heat flux with respect to ocean density
	420	!-- (constants are the specific heat capacities for air and water)
[667]	421	!-- now tswst is the ocean top heat flux
[1427]	422	tswst = tswst / rho(nzt,:,:) * cp / cpw
[102]	423
	424	!
[667]	425	!-- Adjust the momentum fluxes with respect to ocean density
	426	uswst = uswst / rho(nzt,:,:)
	427	vswst = vswst / rho(nzt,:,:)
[102]	428
[667]	429	ENDIF
	430
[709]	431	IF ( coupling_topology == 1 ) THEN
[667]	432	DEALLOCATE( total_2d_o, total_2d_a )
	433	ENDIF
	434
	435	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
	436
	437	#endif
	438
	439	END SUBROUTINE surface_coupler
	440
	441
	442
[709]	443	SUBROUTINE interpolate_to_atmos( tag )
[667]	444
[880]	445	#if defined( __parallel )
	446
[1320]	447	USE arrays_3d, &
	448	ONLY: total_2d_a, total_2d_o
[667]	449
[1320]	450	USE indices, &
	451	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	452
	453	USE kinds
	454
[1324]	455	USE pegrid
[1320]	456
[667]	457	IMPLICIT NONE
	458
[1320]	459	INTEGER(iwp) :: dnx !:
	460	INTEGER(iwp) :: dnx2 !:
	461	INTEGER(iwp) :: dny !:
	462	INTEGER(iwp) :: dny2 !:
	463	INTEGER(iwp) :: i !:
	464	INTEGER(iwp) :: ii !:
	465	INTEGER(iwp) :: j !:
	466	INTEGER(iwp) :: jj !:
[667]	467
[1320]	468	INTEGER(iwp), intent(in) :: tag !:
	469
[667]	470	CALL MPI_BARRIER( comm2d, ierr )
	471
[709]	472	IF ( myid == 0 ) THEN
	473	!
	474	!-- Cyclic boundary conditions for the total 2D-grid
[667]	475	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
	476	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
	477
	478	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
	479	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
	480
[102]	481	!
[667]	482	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
	483	dnx = (nx_o+1) / (nx_a+1)
	484	dny = (ny_o+1) / (ny_a+1)
[102]	485
	486	!
[709]	487	!-- Distance for interpolation around coarse grid points within the fine
	488	!-- grid (note: 2*dnx2 must not be equal with dnx)
[667]	489	dnx2 = 2 * ( dnx / 2 )
	490	dny2 = 2 * ( dny / 2 )
[102]	491
[1353]	492	total_2d_a = 0.0_wp
[102]	493	!
[667]	494	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
	495	DO j = 0, ny_a
	496	DO i = 0, nx_a
	497	DO jj = 0, dny2
	498	DO ii = 0, dnx2
	499	total_2d_a(j,i) = total_2d_a(j,i) &
	500	+ total_2d_o(jdny+jj,idnx+ii)
	501	ENDDO
	502	ENDDO
	503	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
	504	ENDDO
	505	ENDDO
	506	!
[709]	507	!-- Cyclic boundary conditions for atmosphere grid
[667]	508	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
	509	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
	510
	511	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
	512	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
	513	!
	514	!-- Transfer of the atmosphere-grid-layer to the atmosphere
[709]	515	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, target_id, &
	516	tag, comm_inter, ierr )
[102]	517
	518	ENDIF
	519
[667]	520	CALL MPI_BARRIER( comm2d, ierr )
[102]	521
[880]	522	#endif
	523
[667]	524	END SUBROUTINE interpolate_to_atmos
[102]	525
[667]	526
[709]	527	SUBROUTINE interpolate_to_ocean( tag )
[667]	528
[880]	529	#if defined( __parallel )
	530
[1320]	531	USE arrays_3d, &
	532	ONLY: total_2d_a, total_2d_o
[667]	533
[1320]	534	USE indices, &
	535	ONLY: nbgp, nx, nx_a, nx_o, ny, ny_a, ny_o
	536
	537	USE kinds
	538
[1324]	539	USE pegrid
[1320]	540
[667]	541	IMPLICIT NONE
	542
[1320]	543	INTEGER(iwp) :: dnx !:
	544	INTEGER(iwp) :: dny !:
	545	INTEGER(iwp) :: i !:
	546	INTEGER(iwp) :: ii !:
	547	INTEGER(iwp) :: j !:
	548	INTEGER(iwp) :: jj !:
	549	INTEGER(iwp), intent(in) :: tag !:
[667]	550
[1320]	551	REAL(wp) :: fl !:
	552	REAL(wp) :: fr !:
	553	REAL(wp) :: myl !:
	554	REAL(wp) :: myr !:
[709]	555
[667]	556	CALL MPI_BARRIER( comm2d, ierr )
	557
[709]	558	IF ( myid == 0 ) THEN
[667]	559
	560	!
[709]	561	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
[667]	562	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	563	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	564
	565	!
[709]	566	!-- Cyclic boundary conditions for atmosphere grid
[667]	567	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
	568	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
	569
	570	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
	571	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
	572	!
[709]	573	!-- Bilinear Interpolation from atmosphere grid-layer to ocean grid-layer
[667]	574	DO j = 0, ny
	575	DO i = 0, nx
	576	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
	577	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
	578	DO jj = 0, dny-1
[709]	579	fl = myl*jj + total_2d_a(j,i)
	580	fr = myr*jj + total_2d_a(j,i+1)
[667]	581	DO ii = 0, dnx-1
	582	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
	583	ENDDO
	584	ENDDO
	585	ENDDO
	586	ENDDO
	587	!
[709]	588	!-- Cyclic boundary conditions for ocean grid
[667]	589	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
	590	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
	591
	592	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
	593	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
	594
	595	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	596	target_id, tag, comm_inter, ierr )
	597
	598	ENDIF
	599
	600	CALL MPI_BARRIER( comm2d, ierr )
	601
[880]	602	#endif
	603
[667]	604	END SUBROUTINE interpolate_to_ocean

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