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step.F90 in trunk/NEMOGCM/NEMO/OPA_SRC – NEMO

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source: trunk/NEMOGCM/NEMO/OPA_SRC/step.F90 @ 5861

Last change on this file since 5861 was 5836, checked in by cetlod, 9 years ago
merge the simplification branch onto the trunk, see ticket #1612
Property svn:keywords set to `Id`
File size: 23.8 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
[5836]	26	!! 3.6 ! 2012-07 (J. Simeon, G. Madec. C. Ethe) Online coarsening of outputs
	27	!! 3.6 ! 2014-04 (F. Roquet, G. Madec) New equations of state
	28	!! 3.7 ! 2014-10 (G. Madec) LDF simplication
	29	!! - ! 2014-12 (G. Madec) remove KPP scheme
[3]	30	!!----------------------------------------------------------------------
[888]	31
	32	!!----------------------------------------------------------------------
[2528]	33	!! stp : OPA system time-stepping
[3]	34	!!----------------------------------------------------------------------
[3764]	35	USE step_oce ! time stepping definition modules
[4990]	36	USE iom
[389]	37
[3]	38	IMPLICIT NONE
	39	PRIVATE
	40
[5836]	41	PUBLIC stp ! called by nemogcm.F90
[3]	42
	43	!! * Substitutions
	44	# include "domzgr_substitute.h90"
[4990]	45	!!gm # include "zdfddm_substitute.h90"
[3]	46	!!----------------------------------------------------------------------
[5836]	47	!! NEMO/OPA 3.7 , NEMO Consortium (2015)
[888]	48	!! $Id$
[2528]	49	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	50	!!----------------------------------------------------------------------
	51	CONTAINS
	52
[508]	53	#if defined key_agrif
[5656]	54	RECURSIVE SUBROUTINE stp( )
[1438]	55	INTEGER :: kstp ! ocean time-step index
[508]	56	#else
[467]	57	SUBROUTINE stp( kstp )
[1438]	58	INTEGER, INTENT(in) :: kstp ! ocean time-step index
[467]	59	#endif
	60	!!----------------------------------------------------------------------
[3]	61	!! * ROUTINE stp *
[3764]	62	!!
[3]	63	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
	64	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
	65	!! - Tme stepping of TRC (passive tracer eqs.)
[3764]	66	!!
	67	!! ** Method : -1- Update forcings and data
	68	!! -2- Update ocean physics
	69	!! -3- Compute the t and s trends
	70	!! -4- Update t and s
[3]	71	!! -5- Compute the momentum trends
	72	!! -6- Update the horizontal velocity
[5836]	73	!! -7- Compute the diagnostics variables (rd,N2, hdiv,w)
[3]	74	!! -8- Outputs and diagnostics
	75	!!----------------------------------------------------------------------
[888]	76	INTEGER :: jk ! dummy loop indice
[3]	77	INTEGER :: indic ! error indicator if < 0
[4338]	78	INTEGER :: kcall ! optional integer argument (dom_vvl_sf_nxt)
[3]	79	!! ---------------------------------------------------------------------
[392]	80	#if defined key_agrif
[389]	81	kstp = nit000 + Agrif_Nb_Step()
[5836]	82	IF( lk_agrif_debug ) THEN
	83	IF( Agrif_Root() .and. lwp) WRITE(,) '---'
	84	IF(lwp) WRITE(,) 'Grid Number', Agrif_Fixed(),' time step ', kstp, 'int tstep', Agrif_NbStepint()
[5656]	85	ENDIF
[5836]	86	IF( kstp == nit000 + 1 ) lk_agrif_fstep = .FALSE.
[1793]	87	# if defined key_iomput
[5407]	88	IF( Agrif_Nbstepint() == 0 ) CALL iom_swap( cxios_context )
[3764]	89	# endif
	90	#endif
[5836]	91	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	92	! update I/O and calendar
	93	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	94	indic = 0 ! reset to no error condition
	95
	96	IF( kstp == nit000 ) THEN ! initialize IOM context (must be done after nemo_init for AGRIF+XIOS+OASIS)
	97	CALL iom_init( cxios_context ) ! for model grid (including passible AGRIF zoom)
	98	IF( ln_crs ) CALL iom_init( TRIM(cxios_context)//"_crs" ) ! for coarse grid
[4152]	99	ENDIF
[1725]	100	IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init)
[5836]	101	CALL iom_setkt( kstp - nit000 + 1, cxios_context ) ! tell IOM we are at time step kstp
	102	IF( ln_crs ) CALL iom_setkt( kstp - nit000 + 1, TRIM(cxios_context)//"_crs" ) ! tell IOM we are at time step kstp
[3]	103
	104	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5836]	105	! Update external forcing (tides, open boundaries, and surface boundary condition (including sea-ice)
[3]	106	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	107	IF( lk_tide ) CALL sbc_tide( kstp ) ! update tide potential
	108	IF( ln_apr_dyn ) CALL sbc_apr ( kstp ) ! atmospheric pressure (NB: call before bdy_dta which needs ssh_ib)
	109	IF( lk_bdy ) CALL bdy_dta ( kstp, time_offset=+1 ) ! update dynamic & tracer data at open boundaries
	110	CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice)
	111
[3]	112	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5329]	113	! Update stochastic parameters and random T/S fluctuations
	114	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5836]	115	CALL sto_par( kstp ) ! Stochastic parameters
[5329]	116
	117	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	118	! Ocean physics update (ua, va, tsa used as workspace)
[3]	119	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[4990]	120	! THERMODYNAMICS
	121	CALL eos_rab( tsb, rab_b ) ! before local thermal/haline expension ratio at T-points
	122	CALL eos_rab( tsn, rab_n ) ! now local thermal/haline expension ratio at T-points
	123	CALL bn2 ( tsb, rab_b, rn2b ) ! before Brunt-Vaisala frequency
	124	CALL bn2 ( tsn, rab_n, rn2 ) ! now Brunt-Vaisala frequency
[5836]	125
[1492]	126	!
[3764]	127	! VERTICAL PHYSICS
[4369]	128	CALL zdf_bfr( kstp ) ! bottom friction (if quadratic)
[1492]	129	! ! Vertical eddy viscosity and diffusivity coefficients
[2528]	130	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
	131	IF( lk_zdftke ) CALL zdf_tke( kstp ) ! TKE closure scheme for Kz
	132	IF( lk_zdfgls ) CALL zdf_gls( kstp ) ! GLS closure scheme for Kz
[4292]	133	IF( lk_zdfcst ) THEN ! Constant Kz (reset avt, avm[uv] to the background value)
[5120]	134	avt (:,:,:) = rn_avt0 * wmask (:,:,:)
	135	avmu(:,:,:) = rn_avm0 * wumask(:,:,:)
	136	avmv(:,:,:) = rn_avm0 * wvmask(:,:,:)
[677]	137	ENDIF
[5836]	138
[1492]	139	IF( ln_rnf_mouth ) THEN ! increase diffusivity at rivers mouths
[5836]	140	DO jk = 2, nkrnf ; avt(:,:,jk) = avt(:,:,jk) + 2._wp * rn_avt_rnf * rnfmsk(:,:) * tmask(:,:,jk) ; END DO
[3]	141	ENDIF
[1492]	142	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
[3]	143
[1492]	144	IF( lk_zdftmx ) CALL zdf_tmx( kstp ) ! tidal vertical mixing
[3]	145
[5836]	146	IF( lk_zdfddm ) CALL zdf_ddm( kstp ) ! double diffusive mixing
[3764]	147
[1492]	148	CALL zdf_mxl( kstp ) ! mixed layer depth
[3]	149
[2528]	150	! write TKE or GLS information in the restart file
[1531]	151	IF( lrst_oce .AND. lk_zdftke ) CALL tke_rst( kstp, 'WRITE' )
[2528]	152	IF( lrst_oce .AND. lk_zdfgls ) CALL gls_rst( kstp, 'WRITE' )
[1492]	153	!
[3764]	154	! LATERAL PHYSICS
[1492]	155	!
[5836]	156	IF( l_ldfslp ) THEN ! slope of lateral mixing
	157	!!gm : why this here ????
[5329]	158	IF(ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	159	!!gm
[5120]	160	CALL eos( tsb, rhd, gdept_0(:,:,:) ) ! before in situ density
[5836]	161
[5120]	162	IF( ln_zps .AND. .NOT. ln_isfcav) &
	163	& CALL zps_hde ( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	164	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
[5836]	165
[5120]	166	IF( ln_zps .AND. ln_isfcav) &
[5836]	167	& CALL zps_hde_isf( kstp, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF)
[5120]	168	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	169	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the first ocean level
	170
	171	IF( ln_traldf_triad ) THEN
	172	CALL ldf_slp_triad( kstp ) ! before slope for triad operator
	173	ELSE
	174	CALL ldf_slp ( kstp, rhd, rn2b ) ! before slope for standard operator
[2528]	175	ENDIF
[1481]	176	ENDIF
[5836]	177	! ! eddy diffusivity coeff. and/or eiv coeff.
	178	IF( l_ldftra_time .OR. l_ldfeiv_time ) CALL ldf_tra( kstp )
[3]	179
[4369]	180	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5836]	181	! Ocean dynamics : hdiv, ssh, e3, wn
[4369]	182	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	183	CALL ssh_nxt ( kstp ) ! after ssh (includes call to div_hor)
[4387]	184	IF( lk_vvl ) CALL dom_vvl_sf_nxt( kstp ) ! after vertical scale factors
	185	CALL wzv ( kstp ) ! now cross-level velocity
[3634]	186
[4387]	187	IF( lk_dynspg_ts ) THEN
[4369]	188	! In case the time splitting case, update almost all momentum trends here:
	189	! Note that the computation of vertical velocity above, hence "after" sea level
	190	! is necessary to compute momentum advection for the rhs of barotropic loop:
[5836]	191	!!gm : why also here ????
[5329]	192	IF(ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	193	!!gm
[4990]	194	CALL eos ( tsn, rhd, rhop, fsdept_n(:,:,:) ) ! now in situ density for hpg computation
[5836]	195
	196	IF( ln_zps .AND. .NOT. ln_isfcav) & ! Partial steps: bottom before horizontal gradient
	197	& CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! of t, s, rd at the last ocean level
	198	& rhd, gru , grv )
	199	IF( ln_zps .AND. ln_isfcav) & ! Partial steps: top & bottom before horizontal gradient
	200	& CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, gtui, gtvi, &
[5120]	201	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	202	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi )
[4369]	203
[5836]	204	ua(:,:,:) = 0._wp ! set dynamics trends to zero
	205	va(:,:,:) = 0._wp
[5656]	206	IF( lk_asminc .AND. ln_asmiau .AND. &
[4369]	207	& ln_dyninc ) CALL dyn_asm_inc ( kstp ) ! apply dynamics assimilation increment
	208	IF( lk_bdy ) CALL bdy_dyn3d_dmp( kstp ) ! bdy damping trends
	209	CALL dyn_adv ( kstp ) ! advection (vector or flux form)
	210	CALL dyn_vor ( kstp ) ! vorticity term including Coriolis
	211	CALL dyn_ldf ( kstp ) ! lateral mixing
	212	#if defined key_agrif
	213	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momentum sponge
	214	#endif
	215	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
	216	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
	217
	218	ua_sv(:,:,:) = ua(:,:,:) ! Save trends (barotropic trend has been fully updated at this stage)
	219	va_sv(:,:,:) = va(:,:,:)
	220
[5836]	221	CALL div_hor( kstp ) ! Horizontal divergence (2nd call in time-split case)
[4387]	222	IF( lk_vvl ) CALL dom_vvl_sf_nxt( kstp, kcall=2 ) ! after vertical scale factors (update depth average component)
	223	CALL wzv ( kstp ) ! now cross-level velocity
[4369]	224	ENDIF
	225
[1482]	226	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	227	! diagnostics and outputs (ua, va, tsa used as workspace)
[1482]	228	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	229	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
	230	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
	231	IF(.NOT.ln_cpl ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
	232	IF( lk_diadct ) CALL dia_dct( kstp ) ! Transports
	233	IF( lk_diaar5 ) CALL dia_ar5( kstp ) ! ar5 diag
	234	IF( lk_diaharm ) CALL dia_harm( kstp ) ! Tidal harmonic analysis
	235	CALL dia_wri( kstp ) ! ocean model: outputs
[4152]	236	!
[5836]	237	IF( ln_crs ) CALL crs_fld( kstp ) ! ocean model: online field coarsening & output
[1482]	238
[923]	239	#if defined key_top
[3]	240	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	241	! Passive Tracer Model
	242	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	243	CALL trc_stp( kstp ) ! time-stepping
[3]	244	#endif
	245
	246	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	247	! Active tracers (ua, va used as workspace)
[3]	248	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	249	tsa(:,:,:,:) = 0._wp ! set tracer trends to zero
[3]	250
[5656]	251	IF( lk_asminc .AND. ln_asmiau .AND. &
[2528]	252	& ln_trainc ) CALL tra_asm_inc( kstp ) ! apply tracer assimilation increment
[467]	253	CALL tra_sbc ( kstp ) ! surface boundary condition
	254	IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr
[2528]	255	IF( ln_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux
	256	IF( lk_trabbl ) CALL tra_bbl ( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
[3294]	257	IF( ln_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends
[3651]	258	IF( lk_bdy ) CALL bdy_tra_dmp( kstp ) ! bdy damping trends
[467]	259	CALL tra_adv ( kstp ) ! horizontal & vertical advection
	260	CALL tra_ldf ( kstp ) ! lateral mixing
[5147]	261
[5836]	262	!!gm : why CALL to dia_ptr has been moved here??? (use trends info?)
[5147]	263	IF( ln_diaptr ) CALL dia_ptr ! Poleward adv/ldf TRansports diagnostics
[5836]	264	!!gm
[5147]	265
[392]	266	#if defined key_agrif
[782]	267	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge
[389]	268	#endif
[1111]	269	CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields
[1239]	270
[1492]	271	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg (time stepping then eos)
[2528]	272	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection
	273	CALL tra_nxt( kstp ) ! tracer fields at next time step
[5836]	274	!!gm : why again a call to sto_pts ???
[5329]	275	IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	276	!!gm
[4292]	277	CALL eos ( tsa, rhd, rhop, fsdept_n(:,:,:) ) ! Time-filtered in situ density for hpg computation
[5120]	278	IF( ln_zps .AND. .NOT. ln_isfcav) &
	279	& CALL zps_hde ( kstp, jpts, tsa, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	280	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	281	IF( ln_zps .AND. ln_isfcav) &
[5836]	282	& CALL zps_hde_isf( kstp, jpts, tsa, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top/bottom cells
[5120]	283	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	284	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi )
[4215]	285	ELSE ! centered hpg (eos then time stepping)
[4292]	286	IF ( .NOT. lk_dynspg_ts ) THEN ! eos already called in time-split case
[5836]	287	!!gm : why again a call to sto_pts ???
[5329]	288	IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	289	!!gm
[4990]	290	CALL eos ( tsn, rhd, rhop, fsdept_n(:,:,:) ) ! now in situ density for hpg computation
[5120]	291	IF( ln_zps .AND. .NOT. ln_isfcav) &
[5836]	292	& CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps: bottom before horizontal gradient
	293	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
[5120]	294	IF( ln_zps .AND. ln_isfcav) &
[5836]	295	& CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top/bottom cells
[5120]	296	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	297	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[4292]	298	ENDIF
[2528]	299	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection
	300	CALL tra_nxt( kstp ) ! tracer fields at next time step
[3764]	301	ENDIF
[1481]	302
[3]	303	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	304	! Dynamics (tsa used as workspace)
[3]	305	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[4292]	306	IF( lk_dynspg_ts ) THEN
	307	! revert to previously computed momentum tendencies
	308	! (not using ua, va as temporary arrays during tracers' update could avoid that)
	309	ua(:,:,:) = ua_sv(:,:,:)
	310	va(:,:,:) = va_sv(:,:,:)
	311
	312	CALL dyn_bfr( kstp ) ! bottom friction
	313	CALL dyn_zdf( kstp ) ! vertical diffusion
	314	ELSE
[5836]	315	ua(:,:,:) = 0._wp ! set dynamics trends to zero
	316	va(:,:,:) = 0._wp
[3]	317
[5656]	318	IF( lk_asminc .AND. ln_asmiau .AND. &
[4292]	319	& ln_dyninc ) CALL dyn_asm_inc( kstp ) ! apply dynamics assimilation increment
	320	IF( ln_bkgwri ) CALL asm_bkg_wri( kstp ) ! output background fields
	321	IF( lk_bdy ) CALL bdy_dyn3d_dmp(kstp ) ! bdy damping trends
[1492]	322	CALL dyn_adv( kstp ) ! advection (vector or flux form)
	323	CALL dyn_vor( kstp ) ! vorticity term including Coriolis
	324	CALL dyn_ldf( kstp ) ! lateral mixing
[392]	325	#if defined key_agrif
[4292]	326	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge
[389]	327	#endif
[1492]	328	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
[3764]	329	CALL dyn_bfr( kstp ) ! bottom friction
[1492]	330	CALL dyn_zdf( kstp ) ! vertical diffusion
	331	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
[4292]	332	ENDIF
[1492]	333	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
[3]	334
[4292]	335	CALL ssh_swp( kstp ) ! swap of sea surface height
	336	IF( lk_vvl ) CALL dom_vvl_sf_swp( kstp ) ! swap of vertical scale factors
[5656]	337	!
[5836]	338
	339	!!gm : This does not only concern the dynamics ==>>> add a new title
	340	!!gm2: why ouput restart before AGRIF update?
[5656]	341	IF( lrst_oce ) CALL rst_write( kstp ) ! write output ocean restart file
[593]	342
[5656]	343	#if defined key_agrif
	344	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	345	! AGRIF
	346	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	347	CALL Agrif_Integrate_ChildGrids( stp )
	348
	349	IF ( Agrif_NbStepint().EQ.0 ) THEN
	350	CALL Agrif_Update_Tra() ! Update active tracers
	351	CALL Agrif_Update_Dyn() ! Update momentum
	352	ENDIF
	353	#endif
[2528]	354	IF( ln_diahsb ) CALL dia_hsb( kstp ) ! - ML - global conservation diagnostics
	355	IF( lk_diaobs ) CALL dia_obs( kstp ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update)
	356
[3]	357	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5656]	358	! Control
[3]	359	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	360	CALL stp_ctl( kstp, indic )
	361	IF( indic < 0 ) THEN
	362	CALL ctl_stop( 'step: indic < 0' )
	363	CALL dia_wri_state( 'output.abort', kstp )
[1482]	364	ENDIF
[4147]	365	IF( kstp == nit000 ) THEN
[4624]	366	CALL iom_close( numror ) ! close input ocean restart file
	367	IF(lwm) CALL FLUSH ( numond ) ! flush output namelist oce
[5836]	368	IF(lwm.AND.numoni /= -1 ) &
	369	& CALL FLUSH ( numoni ) ! flush output namelist ice (if exist)
[4147]	370	ENDIF
[3]	371
[508]	372	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[75]	373	! Coupled mode
	374	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	375	!!gm why lk_oasis and not lk_cpl ????
[5407]	376	IF( lk_oasis ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges
[508]	377	!
[4153]	378	#if defined key_iomput
	379	IF( kstp == nitend .OR. indic < 0 ) THEN
[5407]	380	CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF
	381	IF( ln_crs ) CALL iom_context_finalize( trim(cxios_context)//"_crs" ) !
[4152]	382	ENDIF
[4153]	383	#endif
[3769]	384	!
[3294]	385	IF( nn_timing == 1 .AND. kstp == nit000 ) CALL timing_reset
[1481]	386	!
[3]	387	END SUBROUTINE stp
	388
	389	!!======================================================================
	390	END MODULE step

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