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source: palm/trunk/SOURCE/surface_coupler.f90 @ 699

Last change on this file since 699 was 668, checked in by suehring, 14 years ago
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[102]	1	SUBROUTINE surface_coupler
	2
	3	!------------------------------------------------------------------------------!
[258]	4	! Current revisions:
[102]	5	! -----------------
	6	!
	7	! Former revisions:
	8	! ------------------
	9	! $Id: surface_coupler.f90 668 2010-12-23 13:22:58Z suehring $
	10	!
[668]	11	! 667 2010-12-23 12:06:00Z suehring/gryschka
	12	! additional case for nonequivalent processor and grid topopolgy in ocean and
	13	! atmosphere added (coupling_topology = 1)
	14	! Added exchange of u and v from Ocean to Atmosphere
	15	!
[392]	16	! 291 2009-04-16 12:07:26Z raasch
	17	! Coupling with independent precursor runs.
	18	! Output of messages replaced by message handling routine.
	19	!
[226]	20	! 206 2008-10-13 14:59:11Z raasch
	21	! Implementation of a MPI-1 Coupling: replaced myid with target_id,
	22	! deleted __mpi2 directives
	23	!
[110]	24	! 109 2007-08-28 15:26:47Z letzel
[102]	25	! Initial revision
	26	!
	27	! Description:
	28	! ------------
	29	! Data exchange at the interface between coupled models
	30	!------------------------------------------------------------------------------!
	31
	32	USE arrays_3d
	33	USE control_parameters
	34	USE cpulog
	35	USE grid_variables
	36	USE indices
	37	USE interfaces
	38	USE pegrid
	39
	40	IMPLICIT NONE
	41
[108]	42	INTEGER :: i, j, k
[102]	43
[291]	44	REAL :: time_since_reference_point_rem
[667]	45	REAL :: total_2d(-nbgp:ny+nbgp,-nbgp:nx+nbgp)
[102]	46
[206]	47	#if defined( __parallel )
[102]	48
[667]	49	CALL cpu_log( log_point(39), 'surface_coupler', 'start' )
[102]	50
[667]	51
	52
[102]	53	!
[108]	54	!-- In case of model termination initiated by the remote model
	55	!-- (terminate_coupled_remote > 0), initiate termination of the local model.
	56	!-- The rest of the coupler must then be skipped because it would cause an MPI
	57	!-- intercomminucation hang.
	58	!-- If necessary, the coupler will be called at the beginning of the next
	59	!-- restart run.
[667]	60
	61	IF ( coupling_topology == 0 ) THEN
	62	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, target_id, &
	63	0, &
	64	terminate_coupled_remote, 1, MPI_INTEGER, target_id, &
	65	0, comm_inter, status, ierr )
	66	ELSE
	67	IF ( myid == 0) THEN
	68	CALL MPI_SENDRECV( terminate_coupled, 1, MPI_INTEGER, &
	69	target_id, 0, &
	70	terminate_coupled_remote, 1, MPI_INTEGER, &
	71	target_id, 0, &
	72	comm_inter, status, ierr )
	73	ENDIF
	74	CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, comm2d, ierr)
	75
	76	ALLOCATE( total_2d_a(-nbgp:ny_a+nbgp,-nbgp:nx_a+nbgp), &
	77	total_2d_o(-nbgp:ny_o+nbgp,-nbgp:nx_o+nbgp) )
	78
	79	ENDIF
	80
[108]	81	IF ( terminate_coupled_remote > 0 ) THEN
[274]	82	WRITE( message_string, * ) 'remote model "', &
	83	TRIM( coupling_mode_remote ), &
	84	'" terminated', &
	85	'&with terminate_coupled_remote = ', &
	86	terminate_coupled_remote, &
	87	'&local model "', TRIM( coupling_mode ), &
	88	'" has', &
	89	'&terminate_coupled = ', &
[667]	90	terminate_coupled
[258]	91	CALL message( 'surface_coupler', 'PA0310', 1, 2, 0, 6, 0 )
[108]	92	RETURN
	93	ENDIF
[667]	94
[291]	95
[108]	96	!
	97	!-- Exchange the current simulated time between the models,
[667]	98	!-- currently just for total_2ding
	99	IF ( coupling_topology == 0 ) THEN
	100	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, &
	101	target_id, 11, comm_inter, ierr )
	102	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
	103	target_id, 11, comm_inter, status, ierr )
	104	ELSE
	105	IF ( myid == 0 ) THEN
	106	CALL MPI_SEND( time_since_reference_point, 1, MPI_REAL, &
	107	target_id, 11, comm_inter, ierr )
	108	CALL MPI_RECV( time_since_reference_point_rem, 1, MPI_REAL, &
	109	target_id, 11, comm_inter, status, ierr )
	110	ENDIF
	111	CALL MPI_BCAST( time_since_reference_point_rem, 1, MPI_REAL, &
	112	0, comm2d, ierr )
	113	ENDIF
[291]	114	WRITE ( 9, * ) 'simulated time: ', simulated_time
	115	WRITE ( 9, * ) 'time since start of coupling: ', &
[667]	116	time_since_reference_point, ' remote: ', &
	117	time_since_reference_point_rem
	118	CALL local_flush( 9 )
	119
[102]	120
	121	!
	122	!-- Exchange the interface data
	123	IF ( coupling_mode == 'atmosphere_to_ocean' ) THEN
[667]	124
	125	!
	126	!-- Horizontal grid size and number of processors is equal
	127	!-- in ocean and atmosphere
	128	IF ( coupling_topology == 0 ) THEN
[102]	129
	130	!
[667]	131	!-- Send heat flux at bottom surface to the ocean model
	132	CALL MPI_SEND( shf(nysg,nxlg), ngp_xy, MPI_REAL, &
	133	target_id, 12, comm_inter, ierr )
[102]	134
	135	!
[667]	136	!-- Send humidity flux at bottom surface to the ocean model
	137	IF ( humidity ) THEN
	138	CALL MPI_SEND( qsws(nysg,nxlg), ngp_xy, MPI_REAL, &
	139	target_id, 13, comm_inter, ierr )
	140	ENDIF
	141
	142	!
	143	!-- Receive temperature at the bottom surface from the ocean model
	144	WRITE ( 9, * ) '*** receive pt from ocean'
[108]	145	CALL local_flush( 9 )
[667]	146	CALL MPI_RECV( pt(0,nysg,nxlg), 1, type_xy, &
	147	target_id, 14, comm_inter, status, ierr )
[108]	148
	149	!
[667]	150	!-- Send the momentum flux (u) at bottom surface to the ocean model
	151	CALL MPI_SEND( usws(nysg,nxlg), ngp_xy, MPI_REAL, &
	152	target_id, 15, comm_inter, ierr )
[102]	153
	154	!
[667]	155	!-- Send the momentum flux (v) at bottom surface to the ocean model
	156	CALL MPI_SEND( vsws(nysg,nxlg), ngp_xy, MPI_REAL, &
	157	target_id, 16, comm_inter, ierr )
[102]	158
	159	!
[667]	160	!-- Receive u at the bottom surface from the ocean model
	161	CALL MPI_RECV( u(0,nysg,nxlg), 1, type_xy, &
	162	target_id, 17, comm_inter, status, ierr )
[102]	163
[667]	164	!
	165	!-- Receive v at the bottom surface from the ocean model
	166	CALL MPI_RECV( v(0,nysg,nxlg), 1, type_xy, &
	167	target_id, 18, comm_inter, status, ierr )
	168
	169	!
	170	!-- Horizontal grid size or number of processors differs between
	171	!-- ocean and atmosphere
	172	ELSE
	173
	174	!
	175	!-- Send heat flux at bottom surface to the ocean model
	176	total_2d_a = 0.0
	177	total_2d = 0.0
	178	total_2d(nys:nyn,nxl:nxr) = shf(nys:nyn,nxl:nxr)
	179	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
	180	MPI_SUM, 0, comm2d, ierr )
	181	CALL interpolate_to_ocean(12)
	182
	183	!
	184	!-- Send humidity flux at bottom surface to the ocean model
	185	IF ( humidity ) THEN
	186	total_2d_a = 0.0
	187	total_2d = 0.0
	188	total_2d(nys:nyn,nxl:nxr) = qsws(nys:nyn,nxl:nxr)
	189	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
	190	MPI_SUM, 0, comm2d, ierr )
	191	CALL interpolate_to_ocean(13)
	192	ENDIF
	193
	194	!
	195	!-- Receive temperature at the bottom surface from the ocean model
	196	IF ( myid == 0 ) THEN
	197	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	198	target_id, 14, comm_inter, status, ierr )
	199	ENDIF
	200	CALL MPI_BARRIER( comm2d, ierr )
	201	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	202	0, comm2d, ierr )
	203	pt(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	204
	205	!
	206	!-- Send momentum flux (u) at bottom surface to the ocean model
	207	total_2d_a = 0.0
	208	total_2d = 0.0
	209	total_2d(nys:nyn,nxl:nxr) = usws(nys:nyn,nxl:nxr)
	210	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
	211	MPI_SUM, 0, comm2d, ierr )
	212	CALL interpolate_to_ocean(15)
	213
	214	!
	215	!-- Send momentum flux (v) at bottom surface to the ocean model
	216	total_2d_a = 0.0
	217	total_2d = 0.0
	218	total_2d(nys:nyn,nxl:nxr) = vsws(nys:nyn,nxl:nxr)
	219	CALL MPI_REDUCE( total_2d, total_2d_a, ngp_a, MPI_REAL, &
	220	MPI_SUM, 0, comm2d, ierr )
	221	CALL interpolate_to_ocean(16)
	222
	223	!
	224	!-- Receive u at the bottom surface from the ocean model
	225	IF ( myid == 0 ) THEN
	226	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	227	target_id, 17, comm_inter, status, ierr )
	228	ENDIF
	229	CALL MPI_BARRIER( comm2d, ierr )
	230	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	231	0, comm2d, ierr )
	232	u(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	233
	234	!
	235	!-- Receive v at the bottom surface from the ocean model
	236	IF ( myid == 0 ) THEN
	237	CALL MPI_RECV( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	238	target_id, 18, comm_inter, status, ierr )
	239	ENDIF
	240	CALL MPI_BARRIER( comm2d, ierr )
	241	CALL MPI_BCAST( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	242	0, comm2d, ierr )
	243	v(0,nysg:nyng,nxlg:nxrg) = total_2d_a(nysg:nyng,nxlg:nxrg)
	244
	245	ENDIF
	246
[102]	247	ELSEIF ( coupling_mode == 'ocean_to_atmosphere' ) THEN
	248
	249	!
[667]	250	!-- Horizontal grid size and number of processors is equal
	251	!-- in ocean and atmosphere
	252	IF ( coupling_topology == 0 ) THEN
	253	!
	254	!-- Receive heat flux at the sea surface (top) from the atmosphere model
	255	CALL MPI_RECV( tswst(nysg,nxlg), ngp_xy, MPI_REAL, &
	256	target_id, 12, comm_inter, status, ierr )
[102]	257
[667]	258
[102]	259	!
[667]	260	!-- Receive humidity flux from the atmosphere model (bottom)
	261	!-- and add it to the heat flux at the sea surface (top)...
	262	IF ( humidity_remote ) THEN
	263	CALL MPI_RECV( qswst_remote(nysg,nxlg), ngp_xy, MPI_REAL, &
	264	target_id, 13, comm_inter, status, ierr )
	265
	266	ENDIF
	267
	268	!
	269	!-- Send sea surface temperature to the atmosphere model
	270	CALL MPI_SEND( pt(nzt,nysg,nxlg), 1, type_xy, &
	271	target_id, 14, comm_inter, ierr )
	272
	273	!
	274	!-- Receive momentum flux (u) at the sea surface (top) from the atmosphere
	275	!-- model
	276	WRITE ( 9, * ) '*** receive uswst from atmosphere'
[108]	277	CALL local_flush( 9 )
[667]	278	CALL MPI_RECV( uswst(nysg,nxlg), ngp_xy, MPI_REAL, &
	279	target_id, 15, comm_inter, status, ierr )
[108]	280
[667]	281	!
	282	!-- Receive momentum flux (v) at the sea surface (top) from the atmosphere
	283	!-- model
	284	CALL MPI_RECV( vswst(nysg,nxlg), ngp_xy, MPI_REAL, &
	285	target_id, 16, comm_inter, status, ierr )
	286
	287	!-- Send u to the atmosphere model
	288	CALL MPI_SEND( u(nzt,nysg,nxlg), 1, type_xy, &
	289	target_id, 17, comm_inter, ierr )
	290
	291	!
	292	!-- Send v to the atmosphere model
	293	CALL MPI_SEND( v(nzt,nysg,nxlg), 1, type_xy, &
	294	target_id, 18, comm_inter, ierr )
	295
	296	!
	297	!-- Horizontal gridsize or number of processors differs between
	298	!-- ocean and atmosphere
	299	ELSE
	300
	301	!
	302	!-- Receive heat flux at the sea surface (top) from the atmosphere model
	303	IF ( myid == 0 ) THEN
	304	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	305	target_id, 12, comm_inter, status, ierr )
	306	ENDIF
	307	CALL MPI_BARRIER( comm2d, ierr )
	308	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	309	0, comm2d, ierr)
	310	tswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	311
	312	!
	313	!-- Receive humidity flux at the sea surface (top) from the
	314	!-- atmosphere model
	315	IF ( humidity_remote ) THEN
	316	IF ( myid == 0 ) THEN
	317	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	318	target_id, 13, comm_inter, status, ierr )
	319	ENDIF
	320	CALL MPI_BARRIER( comm2d, ierr )
	321	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	322	0, comm2d, ierr)
	323	qswst_remote(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	324	ENDIF
	325
	326	!
	327	!-- Send surface temperature to atmosphere
	328	total_2d_o = 0.0
	329	total_2d = 0.0
	330	total_2d(nys:nyn,nxl:nxr) = pt(nzt,nys:nyn,nxl:nxr)
	331
	332	CALL MPI_REDUCE(total_2d, total_2d_o, ngp_o, &
	333	MPI_REAL, MPI_SUM, 0, comm2d, ierr)
	334
	335	CALL interpolate_to_atmos(14)
	336
	337	!
	338	!-- Receive momentum flux (u) at the sea surface (top) from the
	339	!-- atmosphere model
	340	IF ( myid == 0 ) THEN
	341	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	342	target_id, 15, comm_inter, status, ierr )
	343	ENDIF
	344	CALL MPI_BARRIER( comm2d, ierr )
	345	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	346	0, comm2d, ierr)
	347	uswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	348
	349	!
	350	!-- Receive momentum flux (v) at the sea surface (top) from the
	351	!-- atmosphere model
	352	IF ( myid == 0 ) THEN
	353	CALL MPI_RECV( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	354	target_id, 16, comm_inter, status, ierr )
	355	ENDIF
	356	CALL MPI_BARRIER( comm2d, ierr )
	357	CALL MPI_BCAST( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	358	0, comm2d, ierr)
	359	vswst(nysg:nyng,nxlg:nxrg) = total_2d_o(nysg:nyng,nxlg:nxrg)
	360
	361	!
	362	!-- Send u to atmosphere
	363	total_2d_o = 0.0
	364	total_2d = 0.0
	365	total_2d(nys:nyn,nxl:nxr) = u(nzt,nys:nyn,nxl:nxr)
	366	CALL MPI_REDUCE(total_2d, total_2d_o, ngp_o, MPI_REAL, &
	367	MPI_SUM, 0, comm2d, ierr)
	368	CALL interpolate_to_atmos(17)
	369
	370	!
	371	!-- Send v to atmosphere
	372	total_2d_o = 0.0
	373	total_2d = 0.0
	374	total_2d(nys:nyn,nxl:nxr) = v(nzt,nys:nyn,nxl:nxr)
	375	CALL MPI_REDUCE(total_2d, total_2d_o, ngp_o, MPI_REAL, &
	376	MPI_SUM, 0, comm2d, ierr)
	377	CALL interpolate_to_atmos(18)
	378
	379	ENDIF
	380
	381	!
	382	!-- Conversions of fluxes received from atmosphere
	383	IF ( humidity_remote ) THEN
[109]	384	!here tswst is still the sum of atmospheric bottom heat fluxes
	385	tswst = tswst + qswst_remote * 2.2626108e6 / 1005.0
	386	!*latent heat of vaporization in m2/s2, or 540 cal/g, or 40.65 kJ/mol
	387	!/(rho_atm(=1.0)*c_p)
[108]	388	!
[667]	389	!-- ...and convert it to a salinity flux at the sea surface (top)
[108]	390	!-- following Steinhorn (1991), JPO 21, pp. 1681-1683:
	391	!-- S'w' = -S * evaporation / ( rho_water * ( 1 - S ) )
	392	saswst = -1.0 * sa(nzt,:,:) * qswst_remote / &
[667]	393	( rho(nzt,:,:) * ( 1.0 - sa(nzt,:,:) ) )
[108]	394	ENDIF
	395
	396	!
[102]	397	!-- Adjust the kinematic heat flux with respect to ocean density
	398	!-- (constants are the specific heat capacities for air and water)
[667]	399	!-- now tswst is the ocean top heat flux
[108]	400	tswst = tswst / rho(nzt,:,:) * 1005.0 / 4218.0
[102]	401
	402	!
[667]	403	!-- Adjust the momentum fluxes with respect to ocean density
	404	uswst = uswst / rho(nzt,:,:)
	405	vswst = vswst / rho(nzt,:,:)
[102]	406
[667]	407
	408	ENDIF
	409
	410	IF ( coupling_topology == 1 ) THEN
	411	DEALLOCATE( total_2d_o, total_2d_a )
	412	ENDIF
	413
	414	CALL cpu_log( log_point(39), 'surface_coupler', 'stop' )
	415
	416	#endif
	417
	418	END SUBROUTINE surface_coupler
	419
	420
	421
	422	SUBROUTINE interpolate_to_atmos(tag)
	423
	424	USE arrays_3d
	425	USE control_parameters
	426	USE grid_variables
	427	USE indices
	428	USE pegrid
	429
	430	IMPLICIT NONE
	431
	432
	433	INTEGER :: dnx, dnx2, dny, dny2, i, ii, j, jj
	434	INTEGER, intent(in) :: tag
	435
	436	CALL MPI_BARRIER( comm2d, ierr )
	437
	438	IF ( myid == 0 ) THEN
	439
	440	!
	441	!-- cyclic boundary conditions for the total 2D-grid
	442	total_2d_o(-nbgp:-1,:) = total_2d_o(ny+1-nbgp:ny,:)
	443	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx+1-nbgp:nx)
	444
	445	total_2d_o(ny+1:ny+nbgp,:) = total_2d_o(0:nbgp-1,:)
	446	total_2d_o(:,nx+1:nx+nbgp) = total_2d_o(:,0:nbgp-1)
	447
[102]	448	!
[667]	449	!-- Number of gridpoints of the fine grid within one mesh of the coarse grid
	450	dnx = (nx_o+1) / (nx_a+1)
	451	dny = (ny_o+1) / (ny_a+1)
[102]	452
	453	!
[667]	454	!-- Distance for interpolation around coarse grid points within the fine grid
	455	!-- (note: 2*dnx2 must not be equal with dnx)
	456	dnx2 = 2 * ( dnx / 2 )
	457	dny2 = 2 * ( dny / 2 )
[102]	458
[667]	459	total_2d_a = 0.0
[102]	460	!
[667]	461	!-- Interpolation from ocean-grid-layer to atmosphere-grid-layer
	462	DO j = 0, ny_a
	463	DO i = 0, nx_a
	464	DO jj = 0, dny2
	465	DO ii = 0, dnx2
	466	total_2d_a(j,i) = total_2d_a(j,i) &
	467	+ total_2d_o(jdny+jj,idnx+ii)
	468	ENDDO
	469	ENDDO
	470	total_2d_a(j,i) = total_2d_a(j,i) / ( ( dnx2 + 1 ) * ( dny2 + 1 ) )
	471	ENDDO
	472	ENDDO
	473	!
	474	!-- cyclic boundary conditions for atmosphere grid
	475	total_2d_a(-nbgp:-1,:) = total_2d_a(ny_a+1-nbgp:ny_a,:)
	476	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx_a+1-nbgp:nx_a)
	477
	478	total_2d_a(ny_a+1:ny_a+nbgp,:) = total_2d_a(0:nbgp-1,:)
	479	total_2d_a(:,nx_a+1:nx_a+nbgp) = total_2d_a(:,0:nbgp-1)
	480	!
	481	!-- Transfer of the atmosphere-grid-layer to the atmosphere
	482	CALL MPI_SEND( total_2d_a(-nbgp,-nbgp), ngp_a, MPI_REAL, &
	483	target_id, tag, comm_inter, ierr )
[102]	484
	485	ENDIF
	486
[667]	487	CALL MPI_BARRIER( comm2d, ierr )
[102]	488
[667]	489	END SUBROUTINE interpolate_to_atmos
[102]	490
[667]	491
	492	SUBROUTINE interpolate_to_ocean(tag)
	493
	494	USE arrays_3d
	495	USE control_parameters
	496	USE grid_variables
	497	USE indices
	498	USE pegrid
	499
	500	IMPLICIT NONE
	501
	502	REAL :: fl, fr, myl, myr
	503	INTEGER :: dnx, dny, i, ii, j, jj
	504	INTEGER, intent(in) :: tag
	505
	506	CALL MPI_BARRIER( comm2d, ierr )
	507
	508	IF ( myid == 0 ) THEN
	509
	510	!
	511	! Number of gridpoints of the fine grid within one mesh of the coarse grid
	512	dnx = ( nx_o + 1 ) / ( nx_a + 1 )
	513	dny = ( ny_o + 1 ) / ( ny_a + 1 )
	514
	515	!
	516	!-- cyclic boundary conditions for atmosphere grid
	517	total_2d_a(-nbgp:-1,:) = total_2d_a(ny+1-nbgp:ny,:)
	518	total_2d_a(:,-nbgp:-1) = total_2d_a(:,nx+1-nbgp:nx)
	519
	520	total_2d_a(ny+1:ny+nbgp,:) = total_2d_a(0:nbgp-1,:)
	521	total_2d_a(:,nx+1:nx+nbgp) = total_2d_a(:,0:nbgp-1)
	522	!
	523	!-- Bilinear Interpolation from atmosphere-grid-layer to ocean-grid-layer
	524	DO j = 0, ny
	525	DO i = 0, nx
	526	myl = ( total_2d_a(j+1,i) - total_2d_a(j,i) ) / dny
	527	myr = ( total_2d_a(j+1,i+1) - total_2d_a(j,i+1) ) / dny
	528	DO jj = 0, dny-1
	529	fl = myl*jj + total_2d_a(j,i)
	530	fr = myr*jj + total_2d_a(j,i+1)
	531	DO ii = 0, dnx-1
	532	total_2d_o(jdny+jj,idnx+ii) = ( fr - fl ) / dnx * ii + fl
	533	ENDDO
	534	ENDDO
	535	ENDDO
	536	ENDDO
	537	!
	538	!-- cyclic boundary conditions for ocean grid
	539	total_2d_o(-nbgp:-1,:) = total_2d_o(ny_o+1-nbgp:ny_o,:)
	540	total_2d_o(:,-nbgp:-1) = total_2d_o(:,nx_o+1-nbgp:nx_o)
	541
	542	total_2d_o(ny_o+1:ny_o+nbgp,:) = total_2d_o(0:nbgp-1,:)
	543	total_2d_o(:,nx_o+1:nx_o+nbgp) = total_2d_o(:,0:nbgp-1)
	544
	545
	546	CALL MPI_SEND( total_2d_o(-nbgp,-nbgp), ngp_o, MPI_REAL, &
	547	target_id, tag, comm_inter, ierr )
	548
	549	ENDIF
	550
	551	CALL MPI_BARRIER( comm2d, ierr )
	552
	553	END SUBROUTINE interpolate_to_ocean

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