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step.F90 in branches/dev_1784_OBS/NEMO/OPA_SRC – NEMO

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source: branches/dev_1784_OBS/NEMO/OPA_SRC/step.F90 @ 2279

Last change on this file since 2279 was 2001, checked in by djlea, 14 years ago
Adding observation operator code
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 20.4 KB

Rev	Line
[3]	1	MODULE step
	2	!!======================================================================
	3	!! * MODULE step *
	4	!! Time-stepping : manager of the ocean, tracer and ice time stepping
	5	!!======================================================================
[1438]	6	!! History : OPA ! 1991-03 (G. Madec) Original code
[1492]	7	!! - ! 1991-11 (G. Madec)
	8	!! - ! 1992-06 (M. Imbard) add a first output record
	9	!! - ! 1996-04 (G. Madec) introduction of dynspg
	10	!! - ! 1996-04 (M.A. Foujols) introduction of passive tracer
[1438]	11	!! 8.0 ! 1997-06 (G. Madec) new architecture of call
	12	!! 8.2 ! 1997-06 (G. Madec, M. Imbard, G. Roullet) free surface
	13	!! - ! 1999-02 (G. Madec, N. Grima) hpg implicit
	14	!! - ! 2000-07 (J-M Molines, M. Imbard) Open Bondary Conditions
	15	!! NEMO 1.0 ! 2002-06 (G. Madec) free form, suppress macro-tasking
	16	!! - ! 2004-08 (C. Talandier) New trends organization
[1492]	17	!! - ! 2005-01 (C. Ethe) Add the KPP closure scheme
	18	!! - ! 2005-11 (G. Madec) Reorganisation of tra and dyn calls
	19	!! - ! 2006-01 (L. Debreu, C. Mazauric) Agrif implementation
	20	!! - ! 2006-07 (S. Masson) restart using iom
[1438]	21	!! 3.2 ! 2009-02 (G. Madec, R. Benshila) reintroduicing z*-coordinate
[1533]	22	!! - ! 2009-06 (S. Masson, G. Madec) TKE restart compatible with key_cpl
[3]	23	!!----------------------------------------------------------------------
[888]	24
	25	!!----------------------------------------------------------------------
[3]	26	!! stp : OPA system time-stepping
	27	!!----------------------------------------------------------------------
	28	USE oce ! ocean dynamics and tracers variables
	29	USE dom_oce ! ocean space and time domain variables
	30	USE zdf_oce ! ocean vertical physics variables
[467]	31	USE ldftra_oce ! ocean tracer - trends
	32	USE ldfdyn_oce ! ocean dynamics - trends
[3]	33	USE in_out_manager ! I/O manager
[888]	34	USE iom !
[3]	35	USE lbclnk
	36
	37	USE daymod ! calendar (day routine)
	38
	39	USE dtatem ! ocean temperature data (dta_tem routine)
	40	USE dtasal ! ocean salinity data (dta_sal routine)
[888]	41	USE sbcmod ! surface boundary condition (sbc routine)
	42	USE sbcrnf ! surface boundary condition: runoff variables
[1218]	43	USE sbccpl ! surface boundary condition: coupled formulation (call send at end of step)
	44	USE cpl_oasis3, ONLY : lk_cpl
[3]	45
[1594]	46	#if defined key_top
[187]	47	USE trcstp ! passive tracer time-stepping (trc_stp routine)
[1594]	48	#endif
[3]	49
[467]	50	USE traqsr ! solar radiation penetration (tra_qsr routine)
	51	USE trasbc ! surface boundary condition (tra_sbc routine)
[3]	52	USE trabbc ! bottom boundary condition (tra_bbc routine)
	53	USE trabbl ! bottom boundary layer (tra_bbl routine)
	54	USE tradmp ! internal damping (tra_dmp routine)
[467]	55	USE traadv ! advection scheme control (tra_adv_ctl routine)
	56	USE traldf ! lateral mixing (tra_ldf routine)
	57	USE cla ! cross land advection (tra_cla routine)
	58	! zdfkpp ! KPP non-local tracer fluxes (tra_kpp routine)
	59	USE trazdf ! vertical mixing (tra_zdf routine)
	60	USE tranxt ! time-stepping (tra_nxt routine)
[3]	61	USE tranpc ! non-penetrative convection (tra_npc routine)
	62
	63	USE eosbn2 ! equation of state (eos_bn2 routine)
	64
[643]	65	USE dynadv ! advection (dyn_adv routine)
[1662]	66	USE dynbfr ! Bottom friction terms (dyn_bfr routine)
[643]	67	USE dynvor ! vorticity term (dyn_vor routine)
[467]	68	USE dynhpg ! hydrostatic pressure grad. (dyn_hpg routine)
	69	USE dynldf ! lateral momentum diffusion (dyn_ldf routine)
	70	USE dynzdf ! vertical diffusion (dyn_zdf routine)
	71	USE dynspg_oce ! surface pressure gradient (dyn_spg routine)
	72	USE dynspg ! surface pressure gradient (dyn_spg routine)
	73	USE dynnxt ! time-stepping (dyn_nxt routine)
	74
[3]	75	USE obc_par ! open boundary condition variables
	76	USE obcdta ! open boundary condition data (obc_dta routine)
	77	USE obcrst ! open boundary cond. restart (obc_rst routine)
	78	USE obcrad ! open boundary cond. radiation (obc_rad routine)
	79
[911]	80	USE bdy_par ! unstructured open boundary data variables
	81	USE bdydta ! unstructured open boundary data (bdy_dta routine)
	82
[1565]	83	USE sshwzv ! vertical velocity and ssh (ssh_wzv routine)
[3]	84
	85	USE ldfslp ! iso-neutral slopes (ldf_slp routine)
	86	USE ldfeiv ! eddy induced velocity coef. (ldf_eiv routine)
	87
[1417]	88	USE zdftmx ! tide-induced vertical mixing (zdf_tmx routine)
[3]	89	USE zdfbfr ! bottom friction (zdf_bfr routine)
[1531]	90	USE zdftke_old ! old TKE vertical mixing (zdf_tke_old routine)
[3]	91	USE zdftke ! TKE vertical mixing (zdf_tke routine)
[255]	92	USE zdfkpp ! KPP vertical mixing (zdf_kpp routine)
[3]	93	USE zdfddm ! double diffusion mixing (zdf_ddm routine)
	94	USE zdfevd ! enhanced vertical diffusion (zdf_evd routine)
	95	USE zdfric ! Richardson vertical mixing (zdf_ric routine)
	96	USE zdfmxl ! Mixed-layer depth (zdf_mxl routine)
	97
	98	USE zpshde ! partial step: hor. derivative (zps_hde routine)
[888]	99
[3]	100	USE diawri ! Standard run outputs (dia_wri routine)
[216]	101	USE trdicp ! Ocean momentum/tracers trends (trd_wri routine)
[3]	102	USE trdmld ! mixed-layer trends (trd_mld routine)
[503]	103	USE trdmld_rst ! restart for mixed-layer trends
	104	USE trdmod_oce ! ocean momentum/tracers trends
[108]	105	USE trdvor ! vorticity budget (trd_vor routine)
[216]	106	USE diagap ! hor. mean model-data gap (dia_gap routine)
[3]	107	USE diahdy ! dynamic height (dia_hdy routine)
[132]	108	USE diaptr ! poleward transports (dia_ptr routine)
[1756]	109	USE diaar5 ! AR5 diagnosics (dia_ar5 routine)
[3]	110	USE diahth ! thermocline depth (dia_hth routine)
	111	USE diafwb ! freshwater budget (dia_fwb routine)
[2001]	112	USE diaobs ! obs-minus-model (assimilation) (dia_obs routine)
[3]	113	USE flo_oce ! floats variables
	114	USE floats ! floats computation (flo_stp routine)
	115
	116	USE stpctl ! time stepping control (stp_ctl routine)
[75]	117	USE restart ! ocean restart (rst_wri routine)
[258]	118	USE prtctl ! Print control (prt_ctl routine)
[3]	119
[392]	120	#if defined key_agrif
[389]	121	USE agrif_opa_sponge ! Momemtum and tracers sponges
	122	#endif
	123
[3]	124	IMPLICIT NONE
	125	PRIVATE
	126
[1492]	127	PUBLIC stp ! called by opa.F90
[3]	128
	129	!! * Substitutions
	130	# include "domzgr_substitute.h90"
	131	# include "zdfddm_substitute.h90"
	132	!!----------------------------------------------------------------------
[1492]	133	!! NEMO/OPA 3.2 , LOCEAN-IPSL (2009)
[888]	134	!! $Id$
[508]	135	!! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
[3]	136	!!----------------------------------------------------------------------
	137
	138	CONTAINS
	139
[508]	140	#if defined key_agrif
	141	SUBROUTINE stp( )
[1438]	142	INTEGER :: kstp ! ocean time-step index
[508]	143	#else
[467]	144	SUBROUTINE stp( kstp )
[1438]	145	INTEGER, INTENT(in) :: kstp ! ocean time-step index
[467]	146	#endif
	147	!!----------------------------------------------------------------------
[3]	148	!! * ROUTINE stp *
	149	!!
	150	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
	151	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
	152	!! - Tme stepping of TRC (passive tracer eqs.)
	153	!!
	154	!! ** Method : -1- Update forcings and data
	155	!! -2- Update ocean physics
	156	!! -3- Compute the t and s trends
	157	!! -4- Update t and s
	158	!! -5- Compute the momentum trends
	159	!! -6- Update the horizontal velocity
	160	!! -7- Compute the diagnostics variables (rd,N2, div,cur,w)
	161	!! -8- Outputs and diagnostics
	162	!!----------------------------------------------------------------------
[888]	163	INTEGER :: jk ! dummy loop indice
[3]	164	INTEGER :: indic ! error indicator if < 0
	165	!! ---------------------------------------------------------------------
	166
[392]	167	#if defined key_agrif
[389]	168	kstp = nit000 + Agrif_Nb_Step()
[445]	169	! IF ( Agrif_Root() .and. lwp) Write(,) '---'
[508]	170	! IF (lwp) Write(,) 'Grid Number',Agrif_Fixed(),' time step ',kstp
[389]	171	#endif
[1725]	172	indic = 1 ! reset to no error condition
[508]	173
[1725]	174	IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init)
[3]	175
[1725]	176	CALL iom_setkt( kstp ) ! say to iom that we are at time step kstp
[1359]	177
[1725]	178	CALL rst_opn( kstp ) ! Open the restart file
[508]	179
[3]	180	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[888]	181	! Update data, open boundaries, surface boundary condition (including sea-ice)
[3]	182	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	183	IF( lk_dtatem ) CALL dta_tem( kstp ) ! update 3D temperature data
[888]	184	IF( lk_dtasal ) CALL dta_sal( kstp ) ! update 3D salinity data
	185	CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice)
[35]	186	IF( lk_obc ) CALL obc_dta( kstp ) ! update dynamic and tracer data at open boundaries
[3]	187	IF( lk_obc ) CALL obc_rad( kstp ) ! compute phase velocities at open boundaries
[911]	188	IF( lk_bdy ) CALL bdy_dta( kstp ) ! update dynamic and tracer data at unstructured open boundary
	189
[1438]	190	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	191	! Ocean dynamics : ssh, wn, hdiv, rot !
[1438]	192	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	193	CALL ssh_wzv( kstp ) ! after ssh & vertical velocity
[3]	194
	195	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	196	! Ocean physics update (ua, va, ta, sa used as workspace)
[3]	197	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	198	CALL bn2( tb, sb, rn2b ) ! before Brunt-Vaisala frequency
	199	CALL bn2( tn, sn, rn2 ) ! now Brunt-Vaisala frequency
	200	!
	201	! VERTICAL PHYSICS
[1662]	202	CALL zdf_bfr( kstp ) ! bottom friction
[1492]	203	! ! Vertical eddy viscosity and diffusivity coefficients
[1531]	204	IF( lk_zdfric ) CALL zdf_ric ( kstp ) ! Richardson number dependent Kz
	205	IF( lk_zdftke_old ) CALL zdf_tke_old( kstp ) ! TKE closure scheme for Kz (old scheme)
	206	IF( lk_zdftke ) CALL zdf_tke ( kstp ) ! TKE closure scheme for Kz
	207	IF( lk_zdfkpp ) CALL zdf_kpp ( kstp ) ! KPP closure scheme for Kz
	208	IF( lk_zdfcst ) THEN ! Constant Kz (reset avt, avm[uv] to the background value)
[1537]	209	avt (:,:,:) = rn_avt0 * tmask(:,:,:)
	210	avmu(:,:,:) = rn_avm0 * umask(:,:,:)
	211	avmv(:,:,:) = rn_avm0 * vmask(:,:,:)
[677]	212	ENDIF
[1492]	213	IF( ln_rnf_mouth ) THEN ! increase diffusivity at rivers mouths
[1246]	214	DO jk = 2, nkrnf ; avt(:,:,jk) = avt(:,:,jk) + 2.e0 * rn_avt_rnf * rnfmsk(:,:) * tmask(:,:,jk) ; END DO
[3]	215	ENDIF
[1492]	216	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
[3]	217
[1492]	218	IF( lk_zdftmx ) CALL zdf_tmx( kstp ) ! tidal vertical mixing
[3]	219
[888]	220	IF( lk_zdfddm .AND. .NOT. lk_zdfkpp ) &
[1492]	221	& CALL zdf_ddm( kstp ) ! double diffusive mixing
	222	CALL zdf_mxl( kstp ) ! mixed layer depth
[3]	223
[1531]	224	! write tke information in the restart file
	225	IF( lrst_oce .AND. lk_zdftke ) CALL tke_rst( kstp, 'WRITE' )
[1492]	226	!
	227	! LATERAL PHYSICS
	228	!
	229	IF( lk_ldfslp ) THEN ! slope of lateral mixing
[1546]	230	CALL eos( tb, sb, rhd ) ! before in situ density
[1492]	231	IF( ln_zps ) CALL zps_hde( kstp, tb, sb, rhd, & ! Partial steps: before horizontal gradient
	232	& gtu, gsu, gru, & ! of t, s, rd at the last ocean level
	233	& gtv, gsv, grv )
	234	CALL ldf_slp( kstp, rhd, rn2b ) ! before slope of the lateral mixing
[1481]	235	ENDIF
[3]	236	#if defined key_traldf_c2d
[1492]	237	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
[1239]	238	# endif
[3]	239
[1482]	240	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	241	! diagnostics and outputs (ua, va, ta, sa used as workspace)
[1482]	242	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	243	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
	244	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
	245	IF( lk_diagap ) CALL dia_gap( kstp ) ! basin averaged diagnostics
	246	IF( lk_diahdy ) CALL dia_hdy( kstp ) ! dynamical heigh diagnostics
	247	IF( lk_diafwb ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
[2001]	248	IF( lk_diaobs ) CALL dia_obs( kstp ) ! obs-minus-model (assimilation) diagnostics
[1492]	249	IF( ln_diaptr ) CALL dia_ptr( kstp ) ! Poleward TRansports diagnostics
[1756]	250	IF( lk_diaar5 ) CALL dia_ar5( kstp ) ! ar5 diag
[1635]	251	CALL dia_wri( kstp ) ! ocean model: outputs
[1482]	252
[923]	253	#if defined key_top
[3]	254	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	255	! Passive Tracer Model
	256	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	257	CALL trc_stp( kstp ) ! time-stepping
[3]	258	#endif
	259
	260	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	261	! Active tracers (ua, va used as workspace)
[3]	262	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[467]	263	ta(:,:,:) = 0.e0 ! set tracer trends to zero
	264	sa(:,:,:) = 0.e0
[3]	265
[467]	266	CALL tra_sbc ( kstp ) ! surface boundary condition
	267	IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr
	268	IF( lk_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux
	269	IF( lk_trabbl_dif ) CALL tra_bbl_dif( kstp ) ! diffusive bottom boundary layer scheme
	270	IF( lk_trabbl_adv ) CALL tra_bbl_adv( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
	271	IF( lk_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends
	272	CALL tra_adv ( kstp ) ! horizontal & vertical advection
	273	IF( n_cla == 1 ) CALL tra_cla ( kstp ) ! Cross Land Advection (Update Hor. advection)
	274	IF( lk_zdfkpp ) CALL tra_kpp ( kstp ) ! KPP non-local tracer fluxes
	275	CALL tra_ldf ( kstp ) ! lateral mixing
[392]	276	#if defined key_agrif
[782]	277	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge
[389]	278	#endif
[1111]	279	CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields
[1239]	280
[1492]	281	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg (time stepping then eos)
	282	IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection
	283	CALL tra_nxt ( kstp ) ! tracer fields at next time step
	284	CALL eos( ta, sa, rhd, rhop ) ! Time-filtered in situ density for hpg computation
	285	IF( ln_zps ) CALL zps_hde( kstp, ta, sa, rhd, & ! Partial steps: time filtered hor. derivative
	286	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
	287	& gtv, gsv, grv )
	288
	289	ELSE ! centered hpg (eos then time stepping)
	290	CALL eos( tn, sn, rhd, rhop ) ! now in situ density for hpg computation
	291	IF( ln_zps ) CALL zps_hde( kstp, tn, sn, rhd, & ! Partial steps: now horizontal derivative
	292	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
	293	& gtv, gsv, grv )
	294	IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection
	295	CALL tra_nxt ( kstp ) ! tracer fields at next time step
[1239]	296	ENDIF
[1481]	297
[3]	298	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	299	! Dynamics (ta, sa used as workspace)
[3]	300	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	301	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
[75]	302	va(:,:,:) = 0.e0
[3]	303
[1492]	304	CALL dyn_adv( kstp ) ! advection (vector or flux form)
	305	CALL dyn_vor( kstp ) ! vorticity term including Coriolis
	306	CALL dyn_ldf( kstp ) ! lateral mixing
[392]	307	#if defined key_agrif
[1492]	308	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge
[389]	309	#endif
[1492]	310	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
[1662]	311	CALL dyn_bfr( kstp ) ! bottom friction
[1492]	312	CALL dyn_zdf( kstp ) ! vertical diffusion
[888]	313	indic=0
[1492]	314	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
	315	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
[3]	316
[1492]	317	CALL ssh_nxt( kstp ) ! sea surface height at next time step
[593]	318
[3]	319	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[888]	320	! Control and restarts
[3]	321	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	322	CALL stp_ctl( kstp, indic )
	323	IF( indic < 0 ) THEN
	324	CALL ctl_stop( 'step: indic < 0' )
	325	CALL dia_wri_state( 'output.abort', kstp )
[1482]	326	ENDIF
[1492]	327	IF( kstp == nit000 ) CALL iom_close( numror ) ! close input ocean restart file
	328	IF( lrst_oce ) CALL rst_write ( kstp ) ! write output ocean restart file
	329	IF( lk_obc ) CALL obc_rst_write( kstp ) ! write open boundary restart file
[3]	330
[508]	331	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	332	! Trends (ua, va, ta, sa used as workspace)
[508]	333	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	334	IF( nstop == 0 ) THEN
	335	IF( lk_trddyn ) CALL trd_dwr( kstp ) ! trends: dynamics
	336	IF( lk_trdtra ) CALL trd_twr( kstp ) ! trends: active tracers
	337	IF( lk_trdmld ) CALL trd_mld( kstp ) ! trends: Mixed-layer
	338	IF( lk_trdvor ) CALL trd_vor( kstp ) ! trends: vorticity budget
[75]	339	ENDIF
[3]	340
[75]	341	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	342	! Coupled mode
	343	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	344	IF( lk_cpl ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges
[508]	345	!
[1481]	346	!
[3]	347	END SUBROUTINE stp
	348
	349	!!======================================================================
	350	END MODULE step

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