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step.F90 in branches/UKMO/dev_r5518_convadj/NEMOGCM/NEMO/OPA_SRC – NEMO

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source: branches/UKMO/dev_r5518_convadj/NEMOGCM/NEMO/OPA_SRC/step.F90 @ 6839

Last change on this file since 6839 was 6839, checked in by timgraham, 8 years ago
Merged in nemo_v3_6_STABLE at r6721
File size: 24.2 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
[2528]	23	!! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface
	24	!! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase + merge TRC-TRA
[3294]	25	!! 3.4 ! 2011-04 (G. Madec, C. Ethe) Merge of dtatem and dtasal
[4990]	26	!! ! 2012-07 (J. Simeon, G. Madec, C. Ethe) Online coarsening of outputs
	27	!! 3.7 ! 2014-04 (F. Roquet, G. Madec) New equations of state
[3]	28	!!----------------------------------------------------------------------
[888]	29
	30	!!----------------------------------------------------------------------
[2528]	31	!! stp : OPA system time-stepping
[3]	32	!!----------------------------------------------------------------------
[3764]	33	USE step_oce ! time stepping definition modules
[4990]	34	USE iom
[389]	35
[3]	36	IMPLICIT NONE
	37	PRIVATE
	38
[2528]	39	PUBLIC stp ! called by opa.F90
[3]	40
	41	!! * Substitutions
	42	# include "domzgr_substitute.h90"
[4990]	43	!!gm # include "zdfddm_substitute.h90"
[3]	44	!!----------------------------------------------------------------------
[4990]	45	!! NEMO/OPA 3.7 , NEMO Consortium (2014)
[888]	46	!! $Id$
[2528]	47	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	48	!!----------------------------------------------------------------------
	49	CONTAINS
	50
[508]	51	#if defined key_agrif
[6839]	52	RECURSIVE SUBROUTINE stp( )
[1438]	53	INTEGER :: kstp ! ocean time-step index
[508]	54	#else
[467]	55	SUBROUTINE stp( kstp )
[1438]	56	INTEGER, INTENT(in) :: kstp ! ocean time-step index
[467]	57	#endif
	58	!!----------------------------------------------------------------------
[3]	59	!! * ROUTINE stp *
[3764]	60	!!
[3]	61	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
	62	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
	63	!! - Tme stepping of TRC (passive tracer eqs.)
[3764]	64	!!
	65	!! ** Method : -1- Update forcings and data
	66	!! -2- Update ocean physics
	67	!! -3- Compute the t and s trends
	68	!! -4- Update t and s
[3]	69	!! -5- Compute the momentum trends
	70	!! -6- Update the horizontal velocity
	71	!! -7- Compute the diagnostics variables (rd,N2, div,cur,w)
	72	!! -8- Outputs and diagnostics
	73	!!----------------------------------------------------------------------
[888]	74	INTEGER :: jk ! dummy loop indice
[3]	75	INTEGER :: indic ! error indicator if < 0
[4338]	76	INTEGER :: kcall ! optional integer argument (dom_vvl_sf_nxt)
[3]	77	!! ---------------------------------------------------------------------
	78
[392]	79	#if defined key_agrif
[389]	80	kstp = nit000 + Agrif_Nb_Step()
[6839]	81	IF ( lk_agrif_debug ) THEN
	82	IF ( Agrif_Root() .and. lwp) Write(,) '---'
	83	IF (lwp) Write(,) 'Grid Number',Agrif_Fixed(),' time step ',kstp, 'int tstep',Agrif_NbStepint()
	84	ENDIF
	85
[4491]	86	IF ( kstp == (nit000 + 1) ) lk_agrif_fstep = .FALSE.
[6839]	87
[1793]	88	# if defined key_iomput
[5407]	89	IF( Agrif_Nbstepint() == 0 ) CALL iom_swap( cxios_context )
[3764]	90	# endif
	91	#endif
[4152]	92	indic = 0 ! reset to no error condition
	93	IF( kstp == nit000 ) THEN
[5407]	94	! must be done after nemo_init for AGRIF+XIOS+OASIS
	95	CALL iom_init( cxios_context ) ! iom_put initialization
	96	IF( ln_crs ) CALL iom_init( TRIM(cxios_context)//"_crs" ) ! initialize context for coarse grid
[4152]	97	ENDIF
[4147]	98
[1725]	99	IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init)
[5407]	100	CALL iom_setkt( kstp - nit000 + 1, cxios_context ) ! tell iom we are at time step kstp
	101	IF( ln_crs ) CALL iom_setkt( kstp - nit000 + 1, TRIM(cxios_context)//"_crs" ) ! tell iom we are at time step kstp
[3]	102
	103	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[6837]	104	! Update data, open boundaries, surface boundary condition (including sea-ice), convective adjustment (cliff)
[3]	105	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[3294]	106	IF( lk_tide ) CALL sbc_tide( kstp )
[5501]	107	IF( lk_bdy ) THEN
[5510]	108	IF( ln_apr_dyn) CALL sbc_apr( kstp ) ! bdy_dta needs ssh_ib
[5501]	109	CALL bdy_dta ( kstp, time_offset=+1 ) ! update dynamic & tracer data at open boundaries
	110	ENDIF
[6837]	111
	112	IF( ln_convadj ) CALL zdf_convadj( kstp ) ! Called here so that tsn is updated before rest of physics is called
	113
	114
[4292]	115	CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice)
	116	! clem: moved here for bdy ice purpose
[3]	117	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5329]	118	! Update stochastic parameters and random T/S fluctuations
	119	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[6839]	120	IF( ln_sto_eos ) CALL sto_par( kstp ) ! Stochastic parameters
	121	IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5329]	122
	123	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	124	! Ocean physics update (ua, va, tsa used as workspace)
[3]	125	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[4990]	126	! THERMODYNAMICS
	127	CALL eos_rab( tsb, rab_b ) ! before local thermal/haline expension ratio at T-points
	128	CALL eos_rab( tsn, rab_n ) ! now local thermal/haline expension ratio at T-points
	129	CALL bn2 ( tsb, rab_b, rn2b ) ! before Brunt-Vaisala frequency
	130	CALL bn2 ( tsn, rab_n, rn2 ) ! now Brunt-Vaisala frequency
[1492]	131	!
[3764]	132	! VERTICAL PHYSICS
[4369]	133	CALL zdf_bfr( kstp ) ! bottom friction (if quadratic)
[1492]	134	! ! Vertical eddy viscosity and diffusivity coefficients
[2528]	135	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
	136	IF( lk_zdftke ) CALL zdf_tke( kstp ) ! TKE closure scheme for Kz
	137	IF( lk_zdfgls ) CALL zdf_gls( kstp ) ! GLS closure scheme for Kz
	138	IF( lk_zdfkpp ) CALL zdf_kpp( kstp ) ! KPP closure scheme for Kz
[4292]	139	IF( lk_zdfcst ) THEN ! Constant Kz (reset avt, avm[uv] to the background value)
[5120]	140	avt (:,:,:) = rn_avt0 * wmask (:,:,:)
	141	avmu(:,:,:) = rn_avm0 * wumask(:,:,:)
	142	avmv(:,:,:) = rn_avm0 * wvmask(:,:,:)
[677]	143	ENDIF
[1492]	144	IF( ln_rnf_mouth ) THEN ! increase diffusivity at rivers mouths
[1246]	145	DO jk = 2, nkrnf ; avt(:,:,jk) = avt(:,:,jk) + 2.e0 * rn_avt_rnf * rnfmsk(:,:) * tmask(:,:,jk) ; END DO
[3]	146	ENDIF
[1492]	147	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
[3]	148
[1492]	149	IF( lk_zdftmx ) CALL zdf_tmx( kstp ) ! tidal vertical mixing
[3]	150
[888]	151	IF( lk_zdfddm .AND. .NOT. lk_zdfkpp ) &
[1492]	152	& CALL zdf_ddm( kstp ) ! double diffusive mixing
[3764]	153
[1492]	154	CALL zdf_mxl( kstp ) ! mixed layer depth
[3]	155
[2528]	156	! write TKE or GLS information in the restart file
[1531]	157	IF( lrst_oce .AND. lk_zdftke ) CALL tke_rst( kstp, 'WRITE' )
[2528]	158	IF( lrst_oce .AND. lk_zdfgls ) CALL gls_rst( kstp, 'WRITE' )
[1492]	159	!
[3764]	160	! LATERAL PHYSICS
[1492]	161	!
	162	IF( lk_ldfslp ) THEN ! slope of lateral mixing
[5120]	163	CALL eos( tsb, rhd, gdept_0(:,:,:) ) ! before in situ density
	164	IF( ln_zps .AND. .NOT. ln_isfcav) &
	165	& CALL zps_hde ( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	166	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	167	IF( ln_zps .AND. ln_isfcav) &
	168	& CALL zps_hde_isf( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	169	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	170	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the first ocean level
[2528]	171	IF( ln_traldf_grif ) THEN ! before slope for Griffies operator
	172	CALL ldf_slp_grif( kstp )
	173	ELSE
	174	CALL ldf_slp( kstp, rhd, rn2b ) ! before slope for Madec operator
	175	ENDIF
[1481]	176	ENDIF
[3]	177	#if defined key_traldf_c2d
[1492]	178	IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient
[2528]	179	#endif
[5407]	180	#if defined key_traldf_c3d && defined key_traldf_smag
[3634]	181	CALL ldf_tra_smag( kstp ) ! eddy induced velocity coefficient
	182	# endif
[5407]	183	#if defined key_dynldf_c3d && defined key_dynldf_smag
[3634]	184	CALL ldf_dyn_smag( kstp ) ! eddy induced velocity coefficient
	185	# endif
[3]	186
[4369]	187	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	188	! Ocean dynamics : hdiv, rot, ssh, e3, wn
	189	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	190	CALL ssh_nxt ( kstp ) ! after ssh (includes call to div_cur)
[4387]	191	IF( lk_vvl ) CALL dom_vvl_sf_nxt( kstp ) ! after vertical scale factors
	192	CALL wzv ( kstp ) ! now cross-level velocity
[3634]	193
[4387]	194	IF( lk_dynspg_ts ) THEN
[4369]	195	! In case the time splitting case, update almost all momentum trends here:
	196	! Note that the computation of vertical velocity above, hence "after" sea level
	197	! is necessary to compute momentum advection for the rhs of barotropic loop:
[4990]	198	CALL eos ( tsn, rhd, rhop, fsdept_n(:,:,:) ) ! now in situ density for hpg computation
[5120]	199	IF( ln_zps .AND. .NOT. ln_isfcav) &
	200	& CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	201	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	202	IF( ln_zps .AND. ln_isfcav) &
	203	& CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	204	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	205	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[4369]	206
	207	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
	208	va(:,:,:) = 0.e0
[6839]	209	IF( lk_asminc .AND. ln_asmiau .AND. &
[4369]	210	& ln_dyninc ) CALL dyn_asm_inc ( kstp ) ! apply dynamics assimilation increment
	211	IF( ln_neptsimp ) CALL dyn_nept_cor ( kstp ) ! subtract Neptune velocities (simplified)
	212	IF( lk_bdy ) CALL bdy_dyn3d_dmp( kstp ) ! bdy damping trends
	213	CALL dyn_adv ( kstp ) ! advection (vector or flux form)
	214	CALL dyn_vor ( kstp ) ! vorticity term including Coriolis
	215	CALL dyn_ldf ( kstp ) ! lateral mixing
	216	IF( ln_neptsimp ) CALL dyn_nept_cor ( kstp ) ! add Neptune velocities (simplified)
	217	#if defined key_agrif
	218	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momentum sponge
	219	#endif
	220	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
	221	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
	222
	223	ua_sv(:,:,:) = ua(:,:,:) ! Save trends (barotropic trend has been fully updated at this stage)
	224	va_sv(:,:,:) = va(:,:,:)
	225
	226	CALL div_cur( kstp ) ! Horizontal divergence & Relative vorticity (2nd call in time-split case)
[4387]	227	IF( lk_vvl ) CALL dom_vvl_sf_nxt( kstp, kcall=2 ) ! after vertical scale factors (update depth average component)
	228	CALL wzv ( kstp ) ! now cross-level velocity
[4369]	229	ENDIF
	230
[1482]	231	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	232	! diagnostics and outputs (ua, va, tsa used as workspace)
[1482]	233	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5147]	234	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
	235	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
[5407]	236	IF( .NOT. ln_cpl ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
[5147]	237	IF( lk_diadct ) CALL dia_dct( kstp ) ! Transports
	238	IF( lk_diaar5 ) CALL dia_ar5( kstp ) ! ar5 diag
	239	IF( lk_diaharm ) CALL dia_harm( kstp ) ! Tidal harmonic analysis
	240	CALL dia_wri( kstp ) ! ocean model: outputs
[4152]	241	!
[5147]	242	IF( ln_crs ) CALL crs_fld( kstp ) ! ocean model: online field coarsening & output
[1482]	243
[923]	244	#if defined key_top
[3]	245	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	246	! Passive Tracer Model
	247	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	248	CALL trc_stp( kstp ) ! time-stepping
[3]	249	#endif
	250
[4990]	251
[3]	252	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	253	! Active tracers (ua, va used as workspace)
[3]	254	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[2528]	255	tsa(:,:,:,:) = 0.e0 ! set tracer trends to zero
[3]	256
[6839]	257	IF( lk_asminc .AND. ln_asmiau .AND. &
[2528]	258	& ln_trainc ) CALL tra_asm_inc( kstp ) ! apply tracer assimilation increment
[467]	259	CALL tra_sbc ( kstp ) ! surface boundary condition
	260	IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr
[2528]	261	IF( ln_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux
	262	IF( lk_trabbl ) CALL tra_bbl ( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
[3294]	263	IF( ln_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends
[3651]	264	IF( lk_bdy ) CALL bdy_tra_dmp( kstp ) ! bdy damping trends
[467]	265	CALL tra_adv ( kstp ) ! horizontal & vertical advection
[2528]	266	IF( lk_zdfkpp ) CALL tra_kpp ( kstp ) ! KPP non-local tracer fluxes
[467]	267	CALL tra_ldf ( kstp ) ! lateral mixing
[5147]	268
	269	IF( ln_diaptr ) CALL dia_ptr ! Poleward adv/ldf TRansports diagnostics
	270
[392]	271	#if defined key_agrif
[782]	272	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge
[389]	273	#endif
[1111]	274	CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields
[1239]	275
[1492]	276	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg (time stepping then eos)
[2528]	277	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection
	278	CALL tra_nxt( kstp ) ! tracer fields at next time step
[4292]	279	CALL eos ( tsa, rhd, rhop, fsdept_n(:,:,:) ) ! Time-filtered in situ density for hpg computation
[5120]	280	IF( ln_zps .AND. .NOT. ln_isfcav) &
	281	& CALL zps_hde ( kstp, jpts, tsa, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	282	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	283	IF( ln_zps .AND. ln_isfcav) &
	284	& CALL zps_hde_isf( kstp, jpts, tsa, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	285	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	286	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[4215]	287	ELSE ! centered hpg (eos then time stepping)
[4292]	288	IF ( .NOT. lk_dynspg_ts ) THEN ! eos already called in time-split case
[4990]	289	CALL eos ( tsn, rhd, rhop, fsdept_n(:,:,:) ) ! now in situ density for hpg computation
[5120]	290	IF( ln_zps .AND. .NOT. ln_isfcav) &
	291	& CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	292	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	293	IF( ln_zps .AND. ln_isfcav) &
	294	& CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps for top cell (ISF)
	295	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
	296	& gtui, gtvi, grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[4292]	297	ENDIF
[2528]	298	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection
	299	CALL tra_nxt( kstp ) ! tracer fields at next time step
[3764]	300	ENDIF
[1481]	301
[3]	302	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	303	! Dynamics (tsa used as workspace)
[3]	304	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[4292]	305	IF( lk_dynspg_ts ) THEN
	306	! revert to previously computed momentum tendencies
	307	! (not using ua, va as temporary arrays during tracers' update could avoid that)
	308	ua(:,:,:) = ua_sv(:,:,:)
	309	va(:,:,:) = va_sv(:,:,:)
	310	! Revert now divergence and rotational to previously computed ones
	311	!(needed because of the time swap in div_cur, at the beginning of each time step)
	312	hdivn(:,:,:) = hdivb(:,:,:)
	313	rotn(:,:,:) = rotb(:,:,:)
	314
	315	CALL dyn_bfr( kstp ) ! bottom friction
	316	CALL dyn_zdf( kstp ) ! vertical diffusion
	317	ELSE
[1492]	318	ua(:,:,:) = 0.e0 ! set dynamics trends to zero
[75]	319	va(:,:,:) = 0.e0
[3]	320
[6839]	321	IF( lk_asminc .AND. ln_asmiau .AND. &
[4292]	322	& ln_dyninc ) CALL dyn_asm_inc( kstp ) ! apply dynamics assimilation increment
	323	IF( ln_bkgwri ) CALL asm_bkg_wri( kstp ) ! output background fields
	324	IF( ln_neptsimp ) CALL dyn_nept_cor( kstp ) ! subtract Neptune velocities (simplified)
	325	IF( lk_bdy ) CALL bdy_dyn3d_dmp(kstp ) ! bdy damping trends
[1492]	326	CALL dyn_adv( kstp ) ! advection (vector or flux form)
	327	CALL dyn_vor( kstp ) ! vorticity term including Coriolis
	328	CALL dyn_ldf( kstp ) ! lateral mixing
[4292]	329	IF( ln_neptsimp ) CALL dyn_nept_cor( kstp ) ! add Neptune velocities (simplified)
[392]	330	#if defined key_agrif
[4292]	331	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge
[389]	332	#endif
[1492]	333	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
[3764]	334	CALL dyn_bfr( kstp ) ! bottom friction
[1492]	335	CALL dyn_zdf( kstp ) ! vertical diffusion
	336	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
[4292]	337	ENDIF
[1492]	338	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
[3]	339
[4292]	340	CALL ssh_swp( kstp ) ! swap of sea surface height
	341	IF( lk_vvl ) CALL dom_vvl_sf_swp( kstp ) ! swap of vertical scale factors
[6839]	342	!
	343	IF( lrst_oce ) CALL rst_write( kstp ) ! write output ocean restart file
	344	IF( ln_sto_eos ) CALL sto_rst_write( kstp ) ! write restart file for stochastic parameters
[593]	345
[6839]	346	#if defined key_agrif
	347	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	348	! AGRIF
	349	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	350	CALL Agrif_Integrate_ChildGrids( stp )
	351
	352	IF ( Agrif_NbStepint().EQ.0 ) THEN
	353	CALL Agrif_Update_Tra() ! Update active tracers
	354	CALL Agrif_Update_Dyn() ! Update momentum
	355	ENDIF
	356	#endif
[2528]	357	IF( ln_diahsb ) CALL dia_hsb( kstp ) ! - ML - global conservation diagnostics
	358	IF( lk_diaobs ) CALL dia_obs( kstp ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update)
	359
[3]	360	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[6839]	361	! Control
[3]	362	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	363	CALL stp_ctl( kstp, indic )
	364	IF( indic < 0 ) THEN
	365	CALL ctl_stop( 'step: indic < 0' )
	366	CALL dia_wri_state( 'output.abort', kstp )
[1482]	367	ENDIF
[4147]	368	IF( kstp == nit000 ) THEN
[4624]	369	CALL iom_close( numror ) ! close input ocean restart file
	370	IF(lwm) CALL FLUSH ( numond ) ! flush output namelist oce
[5147]	371	IF( lwm.AND.numoni /= -1 ) CALL FLUSH ( numoni ) ! flush output namelist ice
[4147]	372	ENDIF
[3]	373
[508]	374	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[75]	375	! Coupled mode
	376	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5407]	377	IF( lk_oasis ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges
[508]	378	!
[4153]	379	#if defined key_iomput
	380	IF( kstp == nitend .OR. indic < 0 ) THEN
[5407]	381	CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF
	382	IF( ln_crs ) CALL iom_context_finalize( trim(cxios_context)//"_crs" ) !
[4152]	383	ENDIF
[4153]	384	#endif
[3769]	385	!
[3294]	386	IF( nn_timing == 1 .AND. kstp == nit000 ) CALL timing_reset
[6839]	387	!
[1481]	388	!
[3]	389	END SUBROUTINE stp
	390
	391	!!======================================================================
	392	END MODULE step

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