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step.F90 in trunk/NEMO/OPA_SRC – NEMO

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source: trunk/NEMO/OPA_SRC/step.F90 @ 1492

Last change on this file since 1492 was 1492, checked in by ctlod, 15 years ago
style and cosmetic changes
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 20.5 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
[1492]	22	!! - ! 2009-06 (S. Masson, G. Madec) TKE2 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
[187]	46	USE trcstp ! passive tracer time-stepping (trc_stp routine)
[3]	47
[467]	48	USE traqsr ! solar radiation penetration (tra_qsr routine)
	49	USE trasbc ! surface boundary condition (tra_sbc routine)
[3]	50	USE trabbc ! bottom boundary condition (tra_bbc routine)
	51	USE trabbl ! bottom boundary layer (tra_bbl routine)
	52	USE tradmp ! internal damping (tra_dmp routine)
[467]	53	USE traadv ! advection scheme control (tra_adv_ctl routine)
	54	USE traldf ! lateral mixing (tra_ldf routine)
	55	USE cla ! cross land advection (tra_cla routine)
	56	! zdfkpp ! KPP non-local tracer fluxes (tra_kpp routine)
	57	USE trazdf ! vertical mixing (tra_zdf routine)
	58	USE tranxt ! time-stepping (tra_nxt routine)
[3]	59	USE tranpc ! non-penetrative convection (tra_npc routine)
	60
	61	USE eosbn2 ! equation of state (eos_bn2 routine)
	62
[643]	63	USE dynadv ! advection (dyn_adv routine)
	64	USE dynvor ! vorticity term (dyn_vor routine)
[467]	65	USE dynhpg ! hydrostatic pressure grad. (dyn_hpg routine)
	66	USE dynldf ! lateral momentum diffusion (dyn_ldf routine)
	67	USE dynzdf ! vertical diffusion (dyn_zdf routine)
	68	USE dynspg_oce ! surface pressure gradient (dyn_spg routine)
	69	USE dynspg ! surface pressure gradient (dyn_spg routine)
	70	USE dynnxt ! time-stepping (dyn_nxt routine)
	71
[3]	72	USE obc_par ! open boundary condition variables
	73	USE obcdta ! open boundary condition data (obc_dta routine)
	74	USE obcrst ! open boundary cond. restart (obc_rst routine)
	75	USE obcrad ! open boundary cond. radiation (obc_rad routine)
	76	USE obcspg ! open boundary cond spg (obc_spg routine)
	77
[911]	78	USE bdy_par ! unstructured open boundary data variables
	79	USE bdydta ! unstructured open boundary data (bdy_dta routine)
	80
[3]	81	USE divcur ! hor. divergence and curl (div & cur routines)
	82	USE cla_div ! cross land: hor. divergence (div_cla routine)
	83	USE wzvmod ! vertical velocity (wzv routine)
	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)
	90	USE zdftke ! TKE vertical mixing (zdf_tke routine)
[1239]	91	USE zdftke2 ! TKE2 vertical mixing (zdf_tke2 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)
[3]	109	USE diahth ! thermocline depth (dia_hth routine)
	110	USE diafwb ! freshwater budget (dia_fwb routine)
	111	USE diaspr ! suface pressure (rigid-lid) (dia_spr routine)
	112	USE flo_oce ! floats variables
	113	USE floats ! floats computation (flo_stp routine)
	114
	115	USE stpctl ! time stepping control (stp_ctl routine)
[75]	116	USE restart ! ocean restart (rst_wri routine)
[258]	117	USE prtctl ! Print control (prt_ctl routine)
[3]	118
[392]	119	#if defined key_agrif
[389]	120	USE agrif_opa_sponge ! Momemtum and tracers sponges
	121	#endif
	122
[3]	123	IMPLICIT NONE
	124	PRIVATE
	125
[1492]	126	PUBLIC stp ! called by opa.F90
[3]	127
	128	!! * Substitutions
	129	# include "domzgr_substitute.h90"
	130	# include "zdfddm_substitute.h90"
	131	!!----------------------------------------------------------------------
[1492]	132	!! NEMO/OPA 3.2 , LOCEAN-IPSL (2009)
[888]	133	!! $Id$
[508]	134	!! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
[3]	135	!!----------------------------------------------------------------------
	136
	137	CONTAINS
	138
[508]	139	#if defined key_agrif
	140	SUBROUTINE stp( )
[1438]	141	INTEGER :: kstp ! ocean time-step index
[508]	142	#else
[467]	143	SUBROUTINE stp( kstp )
[1438]	144	INTEGER, INTENT(in) :: kstp ! ocean time-step index
[467]	145	#endif
	146	!!----------------------------------------------------------------------
[3]	147	!! * ROUTINE stp *
	148	!!
	149	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
	150	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
	151	!! - Tme stepping of TRC (passive tracer eqs.)
	152	!!
	153	!! ** Method : -1- Update forcings and data
	154	!! -2- Update ocean physics
	155	!! -3- Compute the t and s trends
	156	!! -4- Update t and s
	157	!! -5- Compute the momentum trends
	158	!! -6- Update the horizontal velocity
	159	!! -7- Compute the diagnostics variables (rd,N2, div,cur,w)
	160	!! -8- Outputs and diagnostics
	161	!!----------------------------------------------------------------------
[888]	162	INTEGER :: jk ! dummy loop indice
[3]	163	INTEGER :: indic ! error indicator if < 0
	164	!! ---------------------------------------------------------------------
	165
[392]	166	#if defined key_agrif
[389]	167	kstp = nit000 + Agrif_Nb_Step()
[445]	168	! IF ( Agrif_Root() .and. lwp) Write(,) '---'
[508]	169	! IF (lwp) Write(,) 'Grid Number',Agrif_Fixed(),' time step ',kstp
[389]	170	#endif
[3]	171	indic = 1 ! reset to no error condition
[508]	172
[3]	173	CALL day( kstp ) ! Calendar
	174
[1359]	175	CALL iom_setkt( kstp ) ! say to iom that we are at time step kstp
	176
[508]	177	CALL rst_opn( kstp ) ! Open the restart file
	178
[3]	179	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[888]	180	! Update data, open boundaries, surface boundary condition (including sea-ice)
[3]	181	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	182	IF( lk_dtatem ) CALL dta_tem( kstp ) ! update 3D temperature data
[888]	183	IF( lk_dtasal ) CALL dta_sal( kstp ) ! update 3D salinity data
	184	CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice)
[35]	185	IF( lk_obc ) CALL obc_dta( kstp ) ! update dynamic and tracer data at open boundaries
[3]	186	IF( lk_obc ) CALL obc_rad( kstp ) ! compute phase velocities at open boundaries
[911]	187	IF( lk_bdy ) CALL bdy_dta( kstp ) ! update dynamic and tracer data at unstructured open boundary
	188
[1438]	189	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	190	! Ocean dynamics : ssh, wn, hdiv, rot !
[1438]	191	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	192	CALL div_cur( kstp ) ! Horizontal divergence & Relative vorticity
	193	IF( n_cla == 1 ) CALL div_cla( kstp ) ! Cross Land Advection (Update Hor. divergence)
	194	CALL ssh_wzv( kstp ) ! after ssh & vertical velocity
[3]	195
	196	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	197	! Ocean physics update (ua, va, ta, sa used as workspace)
[3]	198	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	199	CALL bn2( tb, sb, rn2b ) ! before Brunt-Vaisala frequency
	200	CALL bn2( tn, sn, rn2 ) ! now Brunt-Vaisala frequency
	201	!
	202	! VERTICAL PHYSICS
	203	! ! Vertical eddy viscosity and diffusivity coefficients
	204	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
	205	IF( lk_zdftke ) CALL zdf_tke ( kstp ) ! TKE closure scheme for Kz
	206	IF( lk_zdftke2 ) CALL zdf_tke2( kstp ) ! TKE2 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)
[677]	209	avt (:,:,:) = avt0 * tmask(:,:,:)
	210	avmu(:,:,:) = avm0 * umask(:,:,:)
	211	avmv(:,:,:) = avm0 * vmask(:,:,:)
	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
[3]	222
[1492]	223	CALL zdf_bfr( kstp ) ! bottom friction
[1417]	224
[1492]	225	CALL zdf_mxl( kstp ) ! mixed layer depth
[3]	226
[1492]	227	! write tke2 information in the restart file
	228	IF( lrst_oce .AND. lk_zdftke2 ) CALL tke2_rst( kstp, 'WRITE' )
	229	!
	230	! LATERAL PHYSICS
	231	!
	232	IF( lk_ldfslp ) THEN ! slope of lateral mixing
	233	CALL eos( tb, sb, rhd, rhop ) ! before in situ density
	234	IF( ln_zps ) CALL zps_hde( kstp, tb, sb, rhd, & ! Partial steps: before horizontal gradient
	235	& gtu, gsu, gru, & ! of t, s, rd at the last ocean level
	236	& gtv, gsv, grv )
	237	CALL ldf_slp( kstp, rhd, rn2b ) ! before slope of the lateral mixing
[1481]	238	ENDIF
[3]	239	#if defined key_traldf_c2d
[1492]	240	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
[1239]	241	# endif
[3]	242
[1482]	243	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	244	! diagnostics and outputs (ua, va, ta, sa used as workspace)
[1482]	245	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	246	CALL dia_wri( kstp, indic ) ! ocean model: outputs
	247	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
	248	IF( lk_diaspr ) CALL dia_spr( kstp ) ! Surface pressure diagnostics
	249	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
	250	IF( lk_diagap ) CALL dia_gap( kstp ) ! basin averaged diagnostics
	251	IF( lk_diahdy ) CALL dia_hdy( kstp ) ! dynamical heigh diagnostics
	252	IF( lk_diafwb ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
	253	IF( ln_diaptr ) CALL dia_ptr( kstp ) ! Poleward TRansports diagnostics
[1482]	254
[923]	255	#if defined key_top
[3]	256	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	257	! Passive Tracer Model
	258	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	259	CALL trc_stp( kstp ) ! time-stepping
[3]	260	#endif
	261
	262	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	263	! Active tracers (ua, va used as workspace)
[3]	264	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[467]	265	ta(:,:,:) = 0.e0 ! set tracer trends to zero
	266	sa(:,:,:) = 0.e0
[3]	267
[467]	268	CALL tra_sbc ( kstp ) ! surface boundary condition
	269	IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr
	270	IF( lk_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux
	271	IF( lk_trabbl_dif ) CALL tra_bbl_dif( kstp ) ! diffusive bottom boundary layer scheme
	272	IF( lk_trabbl_adv ) CALL tra_bbl_adv( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
	273	IF( lk_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends
	274	CALL tra_adv ( kstp ) ! horizontal & vertical advection
	275	IF( n_cla == 1 ) CALL tra_cla ( kstp ) ! Cross Land Advection (Update Hor. advection)
	276	IF( lk_zdfkpp ) CALL tra_kpp ( kstp ) ! KPP non-local tracer fluxes
	277	CALL tra_ldf ( kstp ) ! lateral mixing
[392]	278	#if defined key_agrif
[782]	279	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge
[389]	280	#endif
[1111]	281	CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields
[1239]	282
[1492]	283	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg (time stepping then eos)
	284	IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection
	285	CALL tra_nxt ( kstp ) ! tracer fields at next time step
	286	CALL eos( ta, sa, rhd, rhop ) ! Time-filtered in situ density for hpg computation
	287	IF( ln_zps ) CALL zps_hde( kstp, ta, sa, rhd, & ! Partial steps: time filtered hor. derivative
	288	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
	289	& gtv, gsv, grv )
	290
	291	ELSE ! centered hpg (eos then time stepping)
	292	CALL eos( tn, sn, rhd, rhop ) ! now in situ density for hpg computation
	293	IF( ln_zps ) CALL zps_hde( kstp, tn, sn, rhd, & ! Partial steps: now horizontal derivative
	294	& gtu, gsu, gru, & ! of t, s, rd at the bottom ocean level
	295	& gtv, gsv, grv )
	296	IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection
	297	CALL tra_nxt ( kstp ) ! tracer fields at next time step
[1239]	298	ENDIF
[1481]	299
[3]	300	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	301	! Dynamics (ta, sa used as workspace)
[3]	302	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	303	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
[75]	304	va(:,:,:) = 0.e0
[3]	305
[1492]	306	CALL dyn_adv( kstp ) ! advection (vector or flux form)
	307	CALL dyn_vor( kstp ) ! vorticity term including Coriolis
	308	CALL dyn_ldf( kstp ) ! lateral mixing
[392]	309	#if defined key_agrif
[1492]	310	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge
[389]	311	#endif
[1492]	312	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
	313	CALL dyn_zdf( kstp ) ! vertical diffusion
[467]	314	IF( lk_dynspg_rl ) THEN
[1492]	315	IF( lk_obc ) CALL obc_spg( kstp ) ! surface pressure gradient at open boundaries
[3]	316	ENDIF
[888]	317	indic=0
[1492]	318	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
	319	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
[3]	320
[1492]	321	CALL ssh_nxt( kstp ) ! sea surface height at next time step
[593]	322
[3]	323	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[888]	324	! Control and restarts
[3]	325	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	326	CALL stp_ctl( kstp, indic )
	327	IF( indic < 0 ) THEN
	328	CALL ctl_stop( 'step: indic < 0' )
	329	CALL dia_wri_state( 'output.abort', kstp )
[1482]	330	ENDIF
[1492]	331	IF( kstp == nit000 ) CALL iom_close( numror ) ! close input ocean restart file
	332	IF( lrst_oce ) CALL rst_write ( kstp ) ! write output ocean restart file
	333	IF( lk_obc ) CALL obc_rst_write( kstp ) ! write open boundary restart file
[3]	334
[508]	335	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	336	! Trends (ua, va, ta, sa used as workspace)
[508]	337	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	338	IF( nstop == 0 ) THEN
	339	IF( lk_trddyn ) CALL trd_dwr( kstp ) ! trends: dynamics
	340	IF( lk_trdtra ) CALL trd_twr( kstp ) ! trends: active tracers
	341	IF( lk_trdmld ) CALL trd_mld( kstp ) ! trends: Mixed-layer
	342	IF( lk_trdvor ) CALL trd_vor( kstp ) ! trends: vorticity budget
[75]	343	ENDIF
[3]	344
[75]	345	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	346	! Coupled mode
	347	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	348	IF( lk_cpl ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges
[508]	349	!
[1481]	350	!
[3]	351	END SUBROUTINE stp
	352
	353	!!======================================================================
	354	END MODULE step

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