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step.F90 in branches/2015/dev_r5836_NOC3_vvl_by_default/NEMOGCM/NEMO/OPA_SRC – NEMO

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source: branches/2015/dev_r5836_NOC3_vvl_by_default/NEMOGCM/NEMO/OPA_SRC/step.F90 @ 5883

Last change on this file since 5883 was 5883, checked in by gm, 8 years ago
#1613: vvl by default: TRA/TRC remove optimization associated with linear free surface
Property svn:keywords set to `Id`
File size: 23.7 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	!!----------------------------------------------------------------------
[5836]	44	!! NEMO/OPA 3.7 , NEMO Consortium (2015)
[888]	45	!! $Id$
[2528]	46	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	47	!!----------------------------------------------------------------------
	48	CONTAINS
	49
[508]	50	#if defined key_agrif
[5656]	51	RECURSIVE SUBROUTINE stp( )
[1438]	52	INTEGER :: kstp ! ocean time-step index
[508]	53	#else
[467]	54	SUBROUTINE stp( kstp )
[1438]	55	INTEGER, INTENT(in) :: kstp ! ocean time-step index
[467]	56	#endif
	57	!!----------------------------------------------------------------------
[3]	58	!! * ROUTINE stp *
[3764]	59	!!
[3]	60	!! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.)
	61	!! - Time stepping of LIM (dynamic and thermodynamic eqs.)
	62	!! - Tme stepping of TRC (passive tracer eqs.)
[3764]	63	!!
	64	!! ** Method : -1- Update forcings and data
	65	!! -2- Update ocean physics
	66	!! -3- Compute the t and s trends
	67	!! -4- Update t and s
[3]	68	!! -5- Compute the momentum trends
	69	!! -6- Update the horizontal velocity
[5836]	70	!! -7- Compute the diagnostics variables (rd,N2, hdiv,w)
[3]	71	!! -8- Outputs and diagnostics
	72	!!----------------------------------------------------------------------
[888]	73	INTEGER :: jk ! dummy loop indice
[3]	74	INTEGER :: indic ! error indicator if < 0
[4338]	75	INTEGER :: kcall ! optional integer argument (dom_vvl_sf_nxt)
[3]	76	!! ---------------------------------------------------------------------
[392]	77	#if defined key_agrif
[389]	78	kstp = nit000 + Agrif_Nb_Step()
[5836]	79	IF( lk_agrif_debug ) THEN
	80	IF( Agrif_Root() .and. lwp) WRITE(,) '---'
	81	IF(lwp) WRITE(,) 'Grid Number', Agrif_Fixed(),' time step ', kstp, 'int tstep', Agrif_NbStepint()
[5656]	82	ENDIF
[5836]	83	IF( kstp == nit000 + 1 ) lk_agrif_fstep = .FALSE.
[1793]	84	# if defined key_iomput
[5407]	85	IF( Agrif_Nbstepint() == 0 ) CALL iom_swap( cxios_context )
[3764]	86	# endif
	87	#endif
[5836]	88	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	89	! update I/O and calendar
	90	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	91	indic = 0 ! reset to no error condition
	92
	93	IF( kstp == nit000 ) THEN ! initialize IOM context (must be done after nemo_init for AGRIF+XIOS+OASIS)
	94	CALL iom_init( cxios_context ) ! for model grid (including passible AGRIF zoom)
	95	IF( ln_crs ) CALL iom_init( TRIM(cxios_context)//"_crs" ) ! for coarse grid
[4152]	96	ENDIF
[1725]	97	IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init)
[5836]	98	CALL iom_setkt( kstp - nit000 + 1, cxios_context ) ! tell IOM we are at time step kstp
	99	IF( ln_crs ) CALL iom_setkt( kstp - nit000 + 1, TRIM(cxios_context)//"_crs" ) ! tell IOM we are at time step kstp
[3]	100
	101	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5836]	102	! Update external forcing (tides, open boundaries, and surface boundary condition (including sea-ice)
[3]	103	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	104	IF( lk_tide ) CALL sbc_tide( kstp ) ! update tide potential
	105	IF( ln_apr_dyn ) CALL sbc_apr ( kstp ) ! atmospheric pressure (NB: call before bdy_dta which needs ssh_ib)
	106	IF( lk_bdy ) CALL bdy_dta ( kstp, time_offset=+1 ) ! update dynamic & tracer data at open boundaries
	107	CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice)
	108
[3]	109	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5329]	110	! Update stochastic parameters and random T/S fluctuations
	111	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5836]	112	CALL sto_par( kstp ) ! Stochastic parameters
[5329]	113
	114	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	115	! Ocean physics update (ua, va, tsa used as workspace)
[3]	116	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[4990]	117	! THERMODYNAMICS
	118	CALL eos_rab( tsb, rab_b ) ! before local thermal/haline expension ratio at T-points
	119	CALL eos_rab( tsn, rab_n ) ! now local thermal/haline expension ratio at T-points
	120	CALL bn2 ( tsb, rab_b, rn2b ) ! before Brunt-Vaisala frequency
	121	CALL bn2 ( tsn, rab_n, rn2 ) ! now Brunt-Vaisala frequency
[5836]	122
[1492]	123	!
[3764]	124	! VERTICAL PHYSICS
[4369]	125	CALL zdf_bfr( kstp ) ! bottom friction (if quadratic)
[1492]	126	! ! Vertical eddy viscosity and diffusivity coefficients
[2528]	127	IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz
	128	IF( lk_zdftke ) CALL zdf_tke( kstp ) ! TKE closure scheme for Kz
	129	IF( lk_zdfgls ) CALL zdf_gls( kstp ) ! GLS closure scheme for Kz
[4292]	130	IF( lk_zdfcst ) THEN ! Constant Kz (reset avt, avm[uv] to the background value)
[5120]	131	avt (:,:,:) = rn_avt0 * wmask (:,:,:)
	132	avmu(:,:,:) = rn_avm0 * wumask(:,:,:)
	133	avmv(:,:,:) = rn_avm0 * wvmask(:,:,:)
[677]	134	ENDIF
[5836]	135
[1492]	136	IF( ln_rnf_mouth ) THEN ! increase diffusivity at rivers mouths
[5836]	137	DO jk = 2, nkrnf ; avt(:,:,jk) = avt(:,:,jk) + 2._wp * rn_avt_rnf * rnfmsk(:,:) * tmask(:,:,jk) ; END DO
[3]	138	ENDIF
[1492]	139	IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity
[3]	140
[1492]	141	IF( lk_zdftmx ) CALL zdf_tmx( kstp ) ! tidal vertical mixing
[3]	142
[5836]	143	IF( lk_zdfddm ) CALL zdf_ddm( kstp ) ! double diffusive mixing
[3764]	144
[1492]	145	CALL zdf_mxl( kstp ) ! mixed layer depth
[3]	146
[2528]	147	! write TKE or GLS information in the restart file
[1531]	148	IF( lrst_oce .AND. lk_zdftke ) CALL tke_rst( kstp, 'WRITE' )
[2528]	149	IF( lrst_oce .AND. lk_zdfgls ) CALL gls_rst( kstp, 'WRITE' )
[1492]	150	!
[3764]	151	! LATERAL PHYSICS
[1492]	152	!
[5836]	153	IF( l_ldfslp ) THEN ! slope of lateral mixing
	154	!!gm : why this here ????
[5329]	155	IF(ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	156	!!gm
[5120]	157	CALL eos( tsb, rhd, gdept_0(:,:,:) ) ! before in situ density
[5836]	158
[5120]	159	IF( ln_zps .AND. .NOT. ln_isfcav) &
	160	& CALL zps_hde ( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
	161	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
[5836]	162
[5120]	163	IF( ln_zps .AND. ln_isfcav) &
[5836]	164	& CALL zps_hde_isf( kstp, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF)
[5120]	165	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	166	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the first ocean level
	167
	168	IF( ln_traldf_triad ) THEN
	169	CALL ldf_slp_triad( kstp ) ! before slope for triad operator
	170	ELSE
	171	CALL ldf_slp ( kstp, rhd, rn2b ) ! before slope for standard operator
[2528]	172	ENDIF
[1481]	173	ENDIF
[5836]	174	! ! eddy diffusivity coeff. and/or eiv coeff.
	175	IF( l_ldftra_time .OR. l_ldfeiv_time ) CALL ldf_tra( kstp )
[3]	176
[4369]	177	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5836]	178	! Ocean dynamics : hdiv, ssh, e3, wn
[4369]	179	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5866]	180	CALL ssh_nxt ( kstp ) ! after ssh (includes call to div_hor)
[5883]	181	CALL dom_vvl_sf_nxt( kstp ) ! after vertical scale factors
[5866]	182	CALL wzv ( kstp ) ! now cross-level velocity
[3634]	183
[4387]	184	IF( lk_dynspg_ts ) THEN
[4369]	185	! In case the time splitting case, update almost all momentum trends here:
	186	! Note that the computation of vertical velocity above, hence "after" sea level
	187	! is necessary to compute momentum advection for the rhs of barotropic loop:
[5836]	188	!!gm : why also here ????
[5329]	189	IF(ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	190	!!gm
[5845]	191	CALL eos ( tsn, rhd, rhop, gdept_n(:,:,:) ) ! now in situ density for hpg computation
[5836]	192
	193	IF( ln_zps .AND. .NOT. ln_isfcav) & ! Partial steps: bottom before horizontal gradient
	194	& CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! of t, s, rd at the last ocean level
	195	& rhd, gru , grv )
	196	IF( ln_zps .AND. ln_isfcav) & ! Partial steps: top & bottom before horizontal gradient
	197	& CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, gtui, gtvi, &
[5120]	198	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	199	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi )
[4369]	200
[5836]	201	ua(:,:,:) = 0._wp ! set dynamics trends to zero
	202	va(:,:,:) = 0._wp
[5656]	203	IF( lk_asminc .AND. ln_asmiau .AND. &
[4369]	204	& ln_dyninc ) CALL dyn_asm_inc ( kstp ) ! apply dynamics assimilation increment
	205	IF( lk_bdy ) CALL bdy_dyn3d_dmp( kstp ) ! bdy damping trends
	206	CALL dyn_adv ( kstp ) ! advection (vector or flux form)
	207	CALL dyn_vor ( kstp ) ! vorticity term including Coriolis
	208	CALL dyn_ldf ( kstp ) ! lateral mixing
	209	#if defined key_agrif
	210	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momentum sponge
	211	#endif
	212	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
	213	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
	214
	215	ua_sv(:,:,:) = ua(:,:,:) ! Save trends (barotropic trend has been fully updated at this stage)
	216	va_sv(:,:,:) = va(:,:,:)
	217
[5836]	218	CALL div_hor( kstp ) ! Horizontal divergence (2nd call in time-split case)
[5883]	219	CALL dom_vvl_sf_nxt( kstp, kcall=2 ) ! after vertical scale factors (update depth average component)
[4387]	220	CALL wzv ( kstp ) ! now cross-level velocity
[4369]	221	ENDIF
	222
[1482]	223	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	224	! diagnostics and outputs (ua, va, tsa used as workspace)
[1482]	225	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	226	IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats
	227	IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth)
	228	IF(.NOT.ln_cpl ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics
	229	IF( lk_diadct ) CALL dia_dct( kstp ) ! Transports
	230	IF( lk_diaar5 ) CALL dia_ar5( kstp ) ! ar5 diag
	231	IF( lk_diaharm ) CALL dia_harm( kstp ) ! Tidal harmonic analysis
	232	CALL dia_wri( kstp ) ! ocean model: outputs
[4152]	233	!
[5836]	234	IF( ln_crs ) CALL crs_fld( kstp ) ! ocean model: online field coarsening & output
[1482]	235
[923]	236	#if defined key_top
[3]	237	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	238	! Passive Tracer Model
	239	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	240	CALL trc_stp( kstp ) ! time-stepping
[3]	241	#endif
	242
	243	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[1492]	244	! Active tracers (ua, va used as workspace)
[3]	245	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	246	tsa(:,:,:,:) = 0._wp ! set tracer trends to zero
[3]	247
[5656]	248	IF( lk_asminc .AND. ln_asmiau .AND. &
[2528]	249	& ln_trainc ) CALL tra_asm_inc( kstp ) ! apply tracer assimilation increment
[467]	250	CALL tra_sbc ( kstp ) ! surface boundary condition
	251	IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr
[2528]	252	IF( ln_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux
	253	IF( lk_trabbl ) CALL tra_bbl ( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme
[3294]	254	IF( ln_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends
[3651]	255	IF( lk_bdy ) CALL bdy_tra_dmp( kstp ) ! bdy damping trends
[467]	256	CALL tra_adv ( kstp ) ! horizontal & vertical advection
	257	CALL tra_ldf ( kstp ) ! lateral mixing
[5147]	258
[5836]	259	!!gm : why CALL to dia_ptr has been moved here??? (use trends info?)
[5147]	260	IF( ln_diaptr ) CALL dia_ptr ! Poleward adv/ldf TRansports diagnostics
[5836]	261	!!gm
[5147]	262
[392]	263	#if defined key_agrif
[782]	264	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge
[389]	265	#endif
[1111]	266	CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields
[1239]	267
[1492]	268	IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg (time stepping then eos)
[2528]	269	IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection
	270	CALL tra_nxt( kstp ) ! tracer fields at next time step
[5836]	271	!!gm : why again a call to sto_pts ???
[5329]	272	IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	273	!!gm
[5845]	274	CALL eos ( tsa, rhd, rhop, gdept_n(:,:,:) ) ! Time-filtered in situ density for hpg computation
[5120]	275	IF( ln_zps .AND. .NOT. ln_isfcav) &
[5845]	276	& CALL zps_hde ( kstp, jpts, tsa, gtsu, gtsv, & ! Partial steps: before horizontal gradient
[5120]	277	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
	278	IF( ln_zps .AND. ln_isfcav) &
[5836]	279	& CALL zps_hde_isf( kstp, jpts, tsa, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top/bottom cells
[5120]	280	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	281	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi )
[4215]	282	ELSE ! centered hpg (eos then time stepping)
[4292]	283	IF ( .NOT. lk_dynspg_ts ) THEN ! eos already called in time-split case
[5836]	284	!!gm : why again a call to sto_pts ???
[5329]	285	IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations
[5836]	286	!!gm
[5845]	287	CALL eos ( tsn, rhd, rhop, gdept_n(:,:,:) ) ! now in situ density for hpg computation
[5120]	288	IF( ln_zps .AND. .NOT. ln_isfcav) &
[5836]	289	& CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps: bottom before horizontal gradient
	290	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
[5120]	291	IF( ln_zps .AND. ln_isfcav) &
[5836]	292	& CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top/bottom cells
[5120]	293	& rhd, gru , grv , aru , arv , gzu , gzv , ge3ru , ge3rv , &
[5836]	294	& grui, grvi, arui, arvi, gzui, gzvi, ge3rui, ge3rvi ) ! of t, s, rd at the last ocean level
[4292]	295	ENDIF
[2528]	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
[3764]	298	ENDIF
[1481]	299
[3]	300	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[3294]	301	! Dynamics (tsa used as workspace)
[3]	302	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[4292]	303	IF( lk_dynspg_ts ) THEN
	304	! revert to previously computed momentum tendencies
	305	! (not using ua, va as temporary arrays during tracers' update could avoid that)
	306	ua(:,:,:) = ua_sv(:,:,:)
	307	va(:,:,:) = va_sv(:,:,:)
	308
	309	CALL dyn_bfr( kstp ) ! bottom friction
	310	CALL dyn_zdf( kstp ) ! vertical diffusion
	311	ELSE
[5836]	312	ua(:,:,:) = 0._wp ! set dynamics trends to zero
	313	va(:,:,:) = 0._wp
[3]	314
[5656]	315	IF( lk_asminc .AND. ln_asmiau .AND. &
[4292]	316	& ln_dyninc ) CALL dyn_asm_inc( kstp ) ! apply dynamics assimilation increment
	317	IF( ln_bkgwri ) CALL asm_bkg_wri( kstp ) ! output background fields
	318	IF( lk_bdy ) CALL bdy_dyn3d_dmp(kstp ) ! bdy damping trends
[1492]	319	CALL dyn_adv( kstp ) ! advection (vector or flux form)
	320	CALL dyn_vor( kstp ) ! vorticity term including Coriolis
	321	CALL dyn_ldf( kstp ) ! lateral mixing
[392]	322	#if defined key_agrif
[4292]	323	IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge
[389]	324	#endif
[1492]	325	CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure
[3764]	326	CALL dyn_bfr( kstp ) ! bottom friction
[1492]	327	CALL dyn_zdf( kstp ) ! vertical diffusion
	328	CALL dyn_spg( kstp, indic ) ! surface pressure gradient
[4292]	329	ENDIF
[1492]	330	CALL dyn_nxt( kstp ) ! lateral velocity at next time step
[3]	331
[4292]	332	CALL ssh_swp( kstp ) ! swap of sea surface height
[5883]	333	CALL dom_vvl_sf_swp( kstp ) ! swap of vertical scale factors
[5656]	334	!
[5836]	335
	336	!!gm : This does not only concern the dynamics ==>>> add a new title
	337	!!gm2: why ouput restart before AGRIF update?
[5656]	338	IF( lrst_oce ) CALL rst_write( kstp ) ! write output ocean restart file
[593]	339
[5656]	340	#if defined key_agrif
	341	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
	342	! AGRIF
	343	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
	344	CALL Agrif_Integrate_ChildGrids( stp )
	345
	346	IF ( Agrif_NbStepint().EQ.0 ) THEN
	347	CALL Agrif_Update_Tra() ! Update active tracers
	348	CALL Agrif_Update_Dyn() ! Update momentum
	349	ENDIF
	350	#endif
[2528]	351	IF( ln_diahsb ) CALL dia_hsb( kstp ) ! - ML - global conservation diagnostics
	352	IF( lk_diaobs ) CALL dia_obs( kstp ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update)
	353
[3]	354	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[5656]	355	! Control
[3]	356	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[1492]	357	CALL stp_ctl( kstp, indic )
	358	IF( indic < 0 ) THEN
	359	CALL ctl_stop( 'step: indic < 0' )
	360	CALL dia_wri_state( 'output.abort', kstp )
[1482]	361	ENDIF
[4147]	362	IF( kstp == nit000 ) THEN
[4624]	363	CALL iom_close( numror ) ! close input ocean restart file
	364	IF(lwm) CALL FLUSH ( numond ) ! flush output namelist oce
[5836]	365	IF(lwm.AND.numoni /= -1 ) &
	366	& CALL FLUSH ( numoni ) ! flush output namelist ice (if exist)
[4147]	367	ENDIF
[3]	368
[508]	369	!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
[75]	370	! Coupled mode
	371	!<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
[5836]	372	!!gm why lk_oasis and not lk_cpl ????
[5407]	373	IF( lk_oasis ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges
[508]	374	!
[4153]	375	#if defined key_iomput
	376	IF( kstp == nitend .OR. indic < 0 ) THEN
[5407]	377	CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF
	378	IF( ln_crs ) CALL iom_context_finalize( trim(cxios_context)//"_crs" ) !
[4152]	379	ENDIF
[4153]	380	#endif
[3769]	381	!
[3294]	382	IF( nn_timing == 1 .AND. kstp == nit000 ) CALL timing_reset
[1481]	383	!
[3]	384	END SUBROUTINE stp
	385
	386	!!======================================================================
	387	END MODULE step

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