MODULE step !!====================================================================== !! *** MODULE step *** !! Time-stepping : manager of the ocean, tracer and ice time stepping !!====================================================================== !! History : OPA ! 1991-03 (G. Madec) Original code !! - ! 1991-11 (G. Madec) !! - ! 1992-06 (M. Imbard) add a first output record !! - ! 1996-04 (G. Madec) introduction of dynspg !! - ! 1996-04 (M.A. Foujols) introduction of passive tracer !! 8.0 ! 1997-06 (G. Madec) new architecture of call !! 8.2 ! 1997-06 (G. Madec, M. Imbard, G. Roullet) free surface !! - ! 1999-02 (G. Madec, N. Grima) hpg implicit !! - ! 2000-07 (J-M Molines, M. Imbard) Open Bondary Conditions !! NEMO 1.0 ! 2002-06 (G. Madec) free form, suppress macro-tasking !! - ! 2004-08 (C. Talandier) New trends organization !! - ! 2005-01 (C. Ethe) Add the KPP closure scheme !! - ! 2005-11 (G. Madec) Reorganisation of tra and dyn calls !! - ! 2006-01 (L. Debreu, C. Mazauric) Agrif implementation !! - ! 2006-07 (S. Masson) restart using iom !! 3.2 ! 2009-02 (G. Madec, R. Benshila) reintroduicing z*-coordinate !! - ! 2009-06 (S. Masson, G. Madec) TKE restart compatible with key_cpl !! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface !! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase + merge TRC-TRA !! 3.4 ! 2011-04 (G. Madec, C. Ethe) Merge of dtatem and dtasal !! 3.6 ! 2012-07 (J. Simeon, G. Madec. C. Ethe) Online coarsening of outputs !! 3.6 ! 2014-04 (F. Roquet, G. Madec) New equations of state !! 3.6 ! 2014-10 (E. Clementi, P. Oddo) Add Qiao vertical mixing in case of waves !! 3.7 ! 2014-10 (G. Madec) LDF simplication !! - ! 2014-12 (G. Madec) remove KPP scheme !! - ! 2015-11 (J. Chanut) free surface simplification (remove filtered free surface) !! 4.0 ! 2017-05 (G. Madec) introduction of the vertical physics manager (zdfphy) !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! stp : OPA system time-stepping !!---------------------------------------------------------------------- USE step_oce ! time stepping definition modules ! USE iom ! xIOs server IMPLICIT NONE PRIVATE PUBLIC stp ! called by nemogcm.F90 !!---------------------------------------------------------------------- !! NEMO/OCE 4.0 , NEMO Consortium (2018) !! $Id$ !! Software governed by the CeCILL license (see ./LICENSE) !!---------------------------------------------------------------------- CONTAINS #if defined key_agrif RECURSIVE SUBROUTINE stp( ) INTEGER :: kstp ! ocean time-step index #else SUBROUTINE stp( kstp ) INTEGER, INTENT(in) :: kstp ! ocean time-step index #endif !!---------------------------------------------------------------------- !! *** ROUTINE stp *** !! !! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.) !! - Time stepping of SI3 (dynamic and thermodynamic eqs.) !! - Time stepping of TRC (passive tracer eqs.) !! !! ** Method : -1- Update forcings and data !! -2- Update ocean physics !! -3- Compute the t and s trends !! -4- Update t and s !! -5- Compute the momentum trends !! -6- Update the horizontal velocity !! -7- Compute the diagnostics variables (rd,N2, hdiv,w) !! -8- Outputs and diagnostics !!---------------------------------------------------------------------- INTEGER :: ji, jj, jk ! dummy loop indice INTEGER :: indic ! error indicator if < 0 !!gm kcall can be removed, I guess INTEGER :: kcall ! optional integer argument (dom_vvl_sf_nxt) !! --------------------------------------------------------------------- #if defined key_agrif kstp = nit000 + Agrif_Nb_Step() IF( lk_agrif_debug ) THEN IF( Agrif_Root() .and. lwp) WRITE(*,*) '---' IF(lwp) WRITE(*,*) 'Grid Number', Agrif_Fixed(),' time step ', kstp, 'int tstep', Agrif_NbStepint() ENDIF IF( kstp == nit000 + 1 ) lk_agrif_fstep = .FALSE. # if defined key_iomput IF( Agrif_Nbstepint() == 0 ) CALL iom_swap( cxios_context ) # endif #endif ! IF( ln_timing ) CALL timing_start('stp') ! !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! update I/O and calendar !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< indic = 0 ! reset to no error condition IF( kstp == nit000 ) THEN ! initialize IOM context (must be done after nemo_init for AGRIF+XIOS+OASIS) CALL iom_init( cxios_context ) ! for model grid (including passible AGRIF zoom) IF( ln_crs ) CALL iom_init( TRIM(cxios_context)//"_crs" ) ! for coarse grid ENDIF IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init) CALL iom_setkt( kstp - nit000 + 1, cxios_context ) ! tell IOM we are at time step kstp IF( ln_crs ) CALL iom_setkt( kstp - nit000 + 1, TRIM(cxios_context)//"_crs" ) ! tell IOM we are at time step kstp !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Update external forcing (tides, open boundaries, and surface boundary condition (including sea-ice) !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< IF( ln_tide ) CALL sbc_tide( kstp ) ! update tide potential IF( ln_apr_dyn ) CALL sbc_apr ( kstp ) ! atmospheric pressure (NB: call before bdy_dta which needs ssh_ib) IF( ln_bdy ) CALL bdy_dta ( kstp, time_offset=+1 ) ! update dynamic & tracer data at open boundaries CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice) !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Update stochastic parameters and random T/S fluctuations !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> IF( ln_sto_eos ) CALL sto_par( kstp ) ! Stochastic parameters IF( ln_sto_eos ) CALL sto_pts( tsn ) ! Random T/S fluctuations !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Ocean physics update !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ! THERMODYNAMICS CALL eos_rab( tsb, rab_b ) ! before local thermal/haline expension ratio at T-points CALL eos_rab( tsn, rab_n ) ! now local thermal/haline expension ratio at T-points CALL bn2 ( tsb, rab_b, rn2b ) ! before Brunt-Vaisala frequency CALL bn2 ( tsn, rab_n, rn2 ) ! now Brunt-Vaisala frequency ! VERTICAL PHYSICS CALL zdf_phy( kstp ) ! vertical physics update (top/bot drag, avt, avs, avm + MLD) ! LATERAL PHYSICS ! IF( l_ldfslp ) THEN ! slope of lateral mixing CALL eos( tsb, rhd, gdept_0(:,:,:) ) ! before in situ density IF( ln_zps .AND. .NOT. ln_isfcav) & & CALL zps_hde ( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient & rhd, gru , grv ) ! of t, s, rd at the last ocean level IF( ln_zps .AND. ln_isfcav) & & CALL zps_hde_isf( kstp, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF) & rhd, gru , grv , grui, grvi ) ! of t, s, rd at the first ocean level IF( ln_traldf_triad ) THEN CALL ldf_slp_triad( kstp ) ! before slope for triad operator ELSE CALL ldf_slp ( kstp, rhd, rn2b ) ! before slope for standard operator ENDIF ENDIF ! ! eddy diffusivity coeff. IF( l_ldftra_time .OR. l_ldfeiv_time ) CALL ldf_tra( kstp ) ! and/or eiv coeff. IF( l_ldfdyn_time ) CALL ldf_dyn( kstp ) ! eddy viscosity coeff. !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Ocean dynamics : hdiv, ssh, e3, u, v, w !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< CALL ssh_nxt ( kstp ) ! after ssh (includes call to div_hor) IF( .NOT.ln_linssh ) CALL dom_vvl_sf_nxt( kstp ) ! after vertical scale factors CALL wzv ( kstp ) ! now cross-level velocity IF( ln_zad_Aimp ) CALL wAimp ( kstp ) ! Adaptive-implicit vertical advection partitioning CALL eos ( tsn, rhd, rhop, gdept_n(:,:,:) ) ! now in situ density for hpg computation !!jc: fs simplification !!jc: lines below are useless if ln_linssh=F. Keep them here (which maintains a bug if ln_linssh=T and ln_zps=T, cf ticket #1636) !! but ensures reproductible results !! with previous versions using split-explicit free surface IF( ln_zps .AND. .NOT. ln_isfcav ) & & CALL zps_hde ( kstp, jpts, tsn, gtsu, gtsv, & ! Partial steps: before horizontal gradient & rhd, gru , grv ) ! of t, s, rd at the last ocean level IF( ln_zps .AND. ln_isfcav ) & & CALL zps_hde_isf( kstp, jpts, tsn, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF) & rhd, gru , grv , grui, grvi ) ! of t, s, rd at the first ocean level !!jc: fs simplification ua(:,:,:) = 0._wp ! set dynamics trends to zero va(:,:,:) = 0._wp IF( lk_asminc .AND. ln_asmiau .AND. ln_dyninc ) & & CALL dyn_asm_inc ( kstp ) ! apply dynamics assimilation increment IF( ln_bdy ) CALL bdy_dyn3d_dmp ( kstp ) ! bdy damping trends #if defined key_agrif IF(.NOT. Agrif_Root()) & & CALL Agrif_Sponge_dyn ! momentum sponge #endif CALL dyn_adv ( kstp ) ! advection (vector or flux form) CALL dyn_vor ( kstp ) ! vorticity term including Coriolis CALL dyn_ldf ( kstp ) ! lateral mixing IF( ln_zdfosm ) CALL dyn_osm ( kstp ) ! OSMOSIS non-local velocity fluxes CALL dyn_hpg ( kstp ) ! horizontal gradient of Hydrostatic pressure CALL dyn_spg ( kstp ) ! surface pressure gradient ! With split-explicit free surface, since now transports have been updated and ssha as well IF( ln_dynspg_ts ) THEN ! vertical scale factors and vertical velocity need to be updated CALL div_hor ( kstp ) ! Horizontal divergence (2nd call in time-split case) IF(.NOT.ln_linssh) CALL dom_vvl_sf_nxt( kstp, kcall=2 ) ! after vertical scale factors (update depth average component) CALL wzv ( kstp ) ! now cross-level velocity IF( ln_zad_Aimp ) CALL wAimp ( kstp ) ! Adaptive-implicit vertical advection partitioning ENDIF CALL dyn_zdf ( kstp ) ! vertical diffusion !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! cool skin !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< IF ( ln_diurnal ) CALL stp_diurnal( kstp ) !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! diagnostics and outputs !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< IF( lk_floats ) CALL flo_stp ( kstp ) ! drifting Floats IF( ln_diacfl ) CALL dia_cfl ( kstp ) ! Courant number diagnostics IF( lk_diahth ) CALL dia_hth ( kstp ) ! Thermocline depth (20 degres isotherm depth) IF( lk_diadct ) CALL dia_dct ( kstp ) ! Transports CALL dia_ar5 ( kstp ) ! ar5 diag IF( lk_diaharm ) CALL dia_harm( kstp ) ! Tidal harmonic analysis CALL dia_wri ( kstp ) ! ocean model: outputs ! IF( ln_crs ) CALL crs_fld ( kstp ) ! ocean model: online field coarsening & output #if defined key_top !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Passive Tracer Model !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< CALL trc_stp ( kstp ) ! time-stepping #endif !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Active tracers !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< tsa(:,:,:,:) = 0._wp ! set tracer trends to zero IF( lk_asminc .AND. ln_asmiau .AND. & & ln_trainc ) CALL tra_asm_inc ( kstp ) ! apply tracer assimilation increment CALL tra_sbc ( kstp ) ! surface boundary condition IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr IF( ln_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux IF( ln_trabbl ) CALL tra_bbl ( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme IF( ln_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends IF( ln_bdy ) CALL bdy_tra_dmp ( kstp ) ! bdy damping trends #if defined key_agrif IF(.NOT. Agrif_Root()) & & CALL Agrif_Sponge_tra ! tracers sponge #endif CALL tra_adv ( kstp ) ! horizontal & vertical advection IF( ln_zdfosm ) CALL tra_osm ( kstp ) ! OSMOSIS non-local tracer fluxes IF( lrst_oce .AND. ln_zdfosm ) & & CALL osm_rst( kstp, 'WRITE' )! write OSMOSIS outputs + wn (so must do here) to restarts CALL tra_ldf ( kstp ) ! lateral mixing !!gm : why CALL to dia_ptr has been moved here??? (use trends info?) IF( ln_diaptr ) CALL dia_ptr ! Poleward adv/ldf TRansports diagnostics !!gm CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields IF( ln_zdfnpc ) CALL tra_npc ( kstp ) ! update after fields by non-penetrative convection !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Set boundary conditions and Swap !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< !!jc1: For agrif, it would be much better to finalize tracers/momentum here (e.g. bdy conditions) and move the swap !! (and time filtering) after Agrif update. Then restart would be done after and would contain updated fields. !! If so: !! (i) no need to call agrif update at initialization time !! (ii) no need to update "before" fields !! !! Apart from creating new tra_swp/dyn_swp routines, this however: !! (i) makes boundary conditions at initialization time computed from updated fields which is not the case between !! two restarts => restartability issue. One can circumvent this, maybe, by assuming "interface separation", !! e.g. a shift of the feedback interface inside child domain. !! (ii) requires that all restart outputs of updated variables by agrif (e.g. passive tracers/tke/barotropic arrays) are done at the same !! place. !! !!jc2: dynnxt must be the latest call. e3t_b are indeed updated in that routine CALL tra_nxt ( kstp ) ! finalize (bcs) tracer fields at next time step and swap CALL dyn_nxt ( kstp ) ! finalize (bcs) velocities at next time step and swap (always called after tra_nxt) CALL ssh_swp ( kstp ) ! swap of sea surface height IF(.NOT.ln_linssh) CALL dom_vvl_sf_swp( kstp ) ! swap of vertical scale factors ! IF( ln_diahsb ) CALL dia_hsb ( kstp ) ! - ML - global conservation diagnostics !!gm : This does not only concern the dynamics ==>>> add a new title !!gm2: why ouput restart before AGRIF update? !! !!jc: That would be better, but see comment above !! IF( lrst_oce ) CALL rst_write ( kstp ) ! write output ocean restart file IF( ln_sto_eos ) CALL sto_rst_write( kstp ) ! write restart file for stochastic parameters #if defined key_agrif !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! AGRIF !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< CALL Agrif_Integrate_ChildGrids( stp ) ! allows to finish all the Child Grids before updating IF( Agrif_NbStepint() == 0 ) CALL Agrif_update_all( ) ! Update all components #endif IF( ln_diaobs ) CALL dia_obs ( kstp ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update) !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Control !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< CALL stp_ctl ( kstp, indic ) IF( kstp == nit000 ) THEN ! 1st time step only CALL iom_close( numror ) ! close input ocean restart file IF(lwm) CALL FLUSH ( numond ) ! flush output namelist oce IF(lwm .AND. numoni /= -1 ) CALL FLUSH ( numoni ) ! flush output namelist ice (if exist) ENDIF !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ! Coupled mode !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< !!gm why lk_oasis and not lk_cpl ???? IF( lk_oasis ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges ! #if defined key_iomput IF( kstp == nitend .OR. indic < 0 ) THEN CALL iom_context_finalize( cxios_context ) ! needed for XIOS+AGRIF IF(lrxios) CALL iom_context_finalize( crxios_context ) IF( ln_crs ) CALL iom_context_finalize( trim(cxios_context)//"_crs" ) ! ENDIF #endif ! IF( ln_timing ) CALL timing_stop('stp') ! END SUBROUTINE stp !!====================================================================== END MODULE step