| 1 | MODULE step |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE step *** |
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| 4 | !! Time-stepping : manager of the ocean, tracer and ice time stepping |
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| 5 | !!====================================================================== |
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| 6 | !! History : OPA ! 1991-03 (G. Madec) Original code |
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| 7 | !! - ! 1991-11 (G. Madec) |
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| 8 | !! - ! 1992-06 (M. Imbard) add a first output record |
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| 9 | !! - ! 1996-04 (G. Madec) introduction of dynspg |
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| 10 | !! - ! 1996-04 (M.A. Foujols) introduction of passive tracer |
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| 11 | !! 8.0 ! 1997-06 (G. Madec) new architecture of call |
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| 12 | !! 8.2 ! 1997-06 (G. Madec, M. Imbard, G. Roullet) free surface |
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| 13 | !! - ! 1999-02 (G. Madec, N. Grima) hpg implicit |
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| 14 | !! - ! 2000-07 (J-M Molines, M. Imbard) Open Bondary Conditions |
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| 15 | !! NEMO 1.0 ! 2002-06 (G. Madec) free form, suppress macro-tasking |
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| 16 | !! - ! 2004-08 (C. Talandier) New trends organization |
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| 17 | !! - ! 2005-01 (C. Ethe) Add the KPP closure scheme |
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| 18 | !! - ! 2005-11 (G. Madec) Reorganisation of tra and dyn calls |
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| 19 | !! - ! 2006-01 (L. Debreu, C. Mazauric) Agrif implementation |
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| 20 | !! - ! 2006-07 (S. Masson) restart using iom |
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| 21 | !! 3.2 ! 2009-02 (G. Madec, R. Benshila) reintroduicing z*-coordinate |
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| 22 | !! - ! 2009-06 (S. Masson, G. Madec) TKE restart compatible with key_cpl |
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| 23 | !! 3.3 ! 2010-05 (K. Mogensen, A. Weaver, M. Martin, D. Lea) Assimilation interface |
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| 24 | !! - ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase + merge TRC-TRA |
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| 25 | !! 3.4 ! 2011-04 (G. Madec, C. Ethe) Merge of dtatem and dtasal |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | |
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| 28 | !!---------------------------------------------------------------------- |
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| 29 | !! stp : OPA system time-stepping |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | USE step_oce ! time stepping definition modules |
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| 32 | |
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| 33 | IMPLICIT NONE |
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| 34 | PRIVATE |
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| 35 | |
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| 36 | PUBLIC stp ! called by opa.F90 |
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| 37 | |
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| 38 | !! * Substitutions |
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| 39 | # include "domzgr_substitute.h90" |
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| 40 | # include "zdfddm_substitute.h90" |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 43 | !! $Id$ |
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| 44 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | CONTAINS |
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| 47 | |
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| 48 | #if defined key_agrif |
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| 49 | SUBROUTINE stp( ) |
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| 50 | INTEGER :: kstp ! ocean time-step index |
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| 51 | #else |
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| 52 | SUBROUTINE stp( kstp ) |
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| 53 | INTEGER, INTENT(in) :: kstp ! ocean time-step index |
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| 54 | #endif |
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| 55 | !!---------------------------------------------------------------------- |
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| 56 | !! *** ROUTINE stp *** |
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| 57 | !! |
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| 58 | !! ** Purpose : - Time stepping of OPA (momentum and active tracer eqs.) |
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| 59 | !! - Time stepping of LIM (dynamic and thermodynamic eqs.) |
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| 60 | !! - Tme stepping of TRC (passive tracer eqs.) |
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| 61 | !! |
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| 62 | !! ** Method : -1- Update forcings and data |
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| 63 | !! -2- Update ocean physics |
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| 64 | !! -3- Compute the t and s trends |
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| 65 | !! -4- Update t and s |
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| 66 | !! -5- Compute the momentum trends |
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| 67 | !! -6- Update the horizontal velocity |
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| 68 | !! -7- Compute the diagnostics variables (rd,N2, div,cur,w) |
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| 69 | !! -8- Outputs and diagnostics |
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| 70 | !!---------------------------------------------------------------------- |
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| 71 | INTEGER :: jk ! dummy loop indice |
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| 72 | INTEGER :: indic ! error indicator if < 0 |
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| 73 | !! --------------------------------------------------------------------- |
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| 74 | |
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| 75 | #if defined key_agrif |
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| 76 | kstp = nit000 + Agrif_Nb_Step() |
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| 77 | ! IF ( Agrif_Root() .and. lwp) Write(*,*) '---' |
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| 78 | ! IF (lwp) Write(*,*) 'Grid Number',Agrif_Fixed(),' time step ',kstp |
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| 79 | # if defined key_iomput |
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| 80 | IF( Agrif_Nbstepint() == 0 ) CALL iom_swap |
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| 81 | # endif |
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| 82 | #endif |
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| 83 | indic = 0 ! reset to no error condition |
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| 84 | IF( kstp == nit000 ) CALL iom_init ! iom_put initialization (must be done after nemo_init for AGRIF+XIOS+OASIS) |
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| 85 | IF( kstp /= nit000 ) CALL day( kstp ) ! Calendar (day was already called at nit000 in day_init) |
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| 86 | CALL iom_setkt( kstp - nit000 + 1 ) ! say to iom that we are at time step kstp |
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| 87 | |
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| 88 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 89 | ! Update data, open boundaries, surface boundary condition (including sea-ice) |
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| 90 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 91 | IF( lk_tide.AND.(kstp /= nit000 )) CALL tide_init ( kstp ) |
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| 92 | IF( lk_tide ) CALL sbc_tide( kstp ) |
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| 93 | IF( lk_obc ) CALL obc_dta( kstp ) ! update dynamic and tracer data at open boundaries |
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| 94 | IF( lk_obc ) CALL obc_rad( kstp ) ! compute phase velocities at open boundaries |
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| 95 | IF( lk_bdy ) CALL bdy_dta( kstp, time_offset=+1 ) ! update dynamic and tracer data at open boundaries |
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| 96 | |
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| 97 | CALL sbc ( kstp ) ! Sea Boundary Condition (including sea-ice) |
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| 98 | ! clem: moved here for bdy ice purpose |
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| 99 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 100 | ! Ocean dynamics : ssh, wn, hdiv, rot ! |
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| 101 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 102 | CALL ssh_wzv( kstp ) ! after ssh & vertical velocity |
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| 103 | |
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| 104 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 105 | ! Ocean physics update (ua, va, tsa used as workspace) |
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| 106 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 107 | CALL bn2( tsb, rn2b ) ! before Brunt-Vaisala frequency |
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| 108 | CALL bn2( tsn, rn2 ) ! now Brunt-Vaisala frequency |
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| 109 | ! |
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| 110 | ! VERTICAL PHYSICS |
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| 111 | ! bg jchanut tschanges |
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| 112 | ! One need bottom friction parameter in ssh_wzv routine with time splitting. |
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| 113 | ! The idea could be to move the call below before ssh_wzv. However, "now" scale factors |
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| 114 | ! at U-V points (which are set thanks to sshu_n, sshv_n) are actually available in sshwzv. |
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| 115 | ! These are needed for log bottom friction... |
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| 116 | #if ! defined key_dynspg_ts |
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| 117 | CALL zdf_bfr( kstp ) ! bottom friction |
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| 118 | #endif |
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| 119 | ! end jchanut tschanges |
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| 120 | |
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| 121 | ! ! Vertical eddy viscosity and diffusivity coefficients |
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| 122 | IF( lk_zdfric ) CALL zdf_ric( kstp ) ! Richardson number dependent Kz |
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| 123 | IF( lk_zdftke ) CALL zdf_tke( kstp ) ! TKE closure scheme for Kz |
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| 124 | IF( lk_zdfgls ) CALL zdf_gls( kstp ) ! GLS closure scheme for Kz |
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| 125 | IF( lk_zdfkpp ) CALL zdf_kpp( kstp ) ! KPP closure scheme for Kz |
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| 126 | IF( lk_zdfcst ) THEN ! Constant Kz (reset avt, avm[uv] to the background value) |
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| 127 | avt (:,:,:) = rn_avt0 * tmask(:,:,:) |
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| 128 | avmu(:,:,:) = rn_avm0 * umask(:,:,:) |
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| 129 | avmv(:,:,:) = rn_avm0 * vmask(:,:,:) |
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| 130 | ENDIF |
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| 131 | IF( ln_rnf_mouth ) THEN ! increase diffusivity at rivers mouths |
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| 132 | DO jk = 2, nkrnf ; avt(:,:,jk) = avt(:,:,jk) + 2.e0 * rn_avt_rnf * rnfmsk(:,:) * tmask(:,:,jk) ; END DO |
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| 133 | ENDIF |
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| 134 | IF( ln_zdfevd ) CALL zdf_evd( kstp ) ! enhanced vertical eddy diffusivity |
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| 135 | |
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| 136 | IF( lk_zdftmx ) CALL zdf_tmx( kstp ) ! tidal vertical mixing |
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| 137 | |
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| 138 | IF( lk_zdfddm .AND. .NOT. lk_zdfkpp ) & |
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| 139 | & CALL zdf_ddm( kstp ) ! double diffusive mixing |
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| 140 | |
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| 141 | CALL zdf_mxl( kstp ) ! mixed layer depth |
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| 142 | |
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| 143 | ! write TKE or GLS information in the restart file |
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| 144 | IF( lrst_oce .AND. lk_zdftke ) CALL tke_rst( kstp, 'WRITE' ) |
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| 145 | IF( lrst_oce .AND. lk_zdfgls ) CALL gls_rst( kstp, 'WRITE' ) |
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| 146 | ! |
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| 147 | ! LATERAL PHYSICS |
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| 148 | ! |
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| 149 | IF( lk_ldfslp ) THEN ! slope of lateral mixing |
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| 150 | CALL eos( tsb, rhd ) ! before in situ density |
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| 151 | IF( ln_zps ) CALL zps_hde( kstp, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient |
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| 152 | & rhd, gru , grv ) ! of t, s, rd at the last ocean level |
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| 153 | IF( ln_traldf_grif ) THEN ! before slope for Griffies operator |
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| 154 | CALL ldf_slp_grif( kstp ) |
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| 155 | ELSE |
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| 156 | CALL ldf_slp( kstp, rhd, rn2b ) ! before slope for Madec operator |
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| 157 | ENDIF |
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| 158 | ENDIF |
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| 159 | #if defined key_traldf_c2d |
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| 160 | IF( lk_traldf_eiv ) CALL ldf_eiv( kstp ) ! eddy induced velocity coefficient |
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| 161 | #endif |
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| 162 | #if defined key_traldf_c3d && key_traldf_smag |
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| 163 | CALL ldf_tra_smag( kstp ) ! eddy induced velocity coefficient |
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| 164 | # endif |
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| 165 | #if defined key_dynldf_c3d && key_dynldf_smag |
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| 166 | CALL ldf_dyn_smag( kstp ) ! eddy induced velocity coefficient |
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| 167 | # endif |
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| 168 | |
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| 169 | |
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| 170 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 171 | ! diagnostics and outputs (ua, va, tsa used as workspace) |
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| 172 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 173 | IF( lk_floats ) CALL flo_stp( kstp ) ! drifting Floats |
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| 174 | IF( lk_diahth ) CALL dia_hth( kstp ) ! Thermocline depth (20 degres isotherm depth) |
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| 175 | IF( lk_diafwb ) CALL dia_fwb( kstp ) ! Fresh water budget diagnostics |
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| 176 | IF( ln_diaptr ) CALL dia_ptr( kstp ) ! Poleward TRansports diagnostics |
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| 177 | IF( lk_diadct ) CALL dia_dct( kstp ) ! Transports |
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| 178 | IF( lk_diaar5 ) CALL dia_ar5( kstp ) ! ar5 diag |
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| 179 | IF( lk_diaharm ) CALL dia_harm( kstp ) ! Tidal harmonic analysis |
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| 180 | CALL dia_wri( kstp ) ! ocean model: outputs |
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| 181 | |
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| 182 | #if defined key_top |
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| 183 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 184 | ! Passive Tracer Model |
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| 185 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 186 | CALL trc_stp( kstp ) ! time-stepping |
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| 187 | #endif |
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| 188 | |
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| 189 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 190 | ! Active tracers (ua, va used as workspace) |
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| 191 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 192 | tsa(:,:,:,:) = 0.e0 ! set tracer trends to zero |
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| 193 | |
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| 194 | IF( ln_asmiau .AND. & |
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| 195 | & ln_trainc ) CALL tra_asm_inc( kstp ) ! apply tracer assimilation increment |
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| 196 | CALL tra_sbc ( kstp ) ! surface boundary condition |
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| 197 | IF( ln_traqsr ) CALL tra_qsr ( kstp ) ! penetrative solar radiation qsr |
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| 198 | IF( ln_trabbc ) CALL tra_bbc ( kstp ) ! bottom heat flux |
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| 199 | IF( lk_trabbl ) CALL tra_bbl ( kstp ) ! advective (and/or diffusive) bottom boundary layer scheme |
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| 200 | IF( ln_tradmp ) CALL tra_dmp ( kstp ) ! internal damping trends |
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| 201 | IF( lk_bdy ) CALL bdy_tra_dmp( kstp ) ! bdy damping trends |
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| 202 | CALL tra_adv ( kstp ) ! horizontal & vertical advection |
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| 203 | IF( lk_zdfkpp ) CALL tra_kpp ( kstp ) ! KPP non-local tracer fluxes |
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| 204 | CALL tra_ldf ( kstp ) ! lateral mixing |
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| 205 | #if defined key_agrif |
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| 206 | IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_tra ! tracers sponge |
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| 207 | #endif |
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| 208 | CALL tra_zdf ( kstp ) ! vertical mixing and after tracer fields |
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| 209 | |
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| 210 | IF( ln_dynhpg_imp ) THEN ! semi-implicit hpg (time stepping then eos) |
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| 211 | IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection |
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| 212 | CALL tra_nxt( kstp ) ! tracer fields at next time step |
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| 213 | CALL eos ( tsa, rhd, rhop ) ! Time-filtered in situ density for hpg computation |
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| 214 | IF( ln_zps ) CALL zps_hde( kstp, jpts, tsa, gtsu, gtsv, & ! zps: time filtered hor. derivative |
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| 215 | & rhd, gru , grv ) ! of t, s, rd at the last ocean level |
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| 216 | |
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| 217 | ELSE |
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| 218 | ! centered hpg (eos then time stepping) |
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| 219 | ! bg jchanut tschanges |
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| 220 | #if ! defined key_dynspg_ts |
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| 221 | ! eos already called |
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| 222 | CALL eos ( tsn, rhd, rhop ) ! now in situ density for hpg computation |
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| 223 | IF( ln_zps ) CALL zps_hde( kstp, jpts, tsn, gtsu, gtsv, & ! zps: now hor. derivative |
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| 224 | & rhd, gru , grv ) ! of t, s, rd at the last ocean level |
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| 225 | #endif |
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| 226 | ! end jchanut tschanges |
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| 227 | IF( ln_zdfnpc ) CALL tra_npc( kstp ) ! update after fields by non-penetrative convection |
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| 228 | CALL tra_nxt( kstp ) ! tracer fields at next time step |
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| 229 | ENDIF |
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| 230 | |
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| 231 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 232 | ! Dynamics (tsa used as workspace) |
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| 233 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 234 | ! bg jchanut tschanges |
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| 235 | #if defined key_dynspg_ts |
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| 236 | ! revert to previously computed tendencies: |
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| 237 | ! (not using ua, va as temporary arrays during tracers' update could avoid that) |
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| 238 | ua(:,:,:) = ua_bak(:,:,:) |
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| 239 | va(:,:,:) = va_bak(:,:,:) |
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| 240 | CALL dyn_bfr( kstp ) ! bottom friction |
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| 241 | CALL dyn_zdf( kstp ) ! vertical diffusion |
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| 242 | #else |
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| 243 | ! end jchanut tschanges |
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| 244 | ua(:,:,:) = 0.e0 ! set dynamics trends to zero |
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| 245 | va(:,:,:) = 0.e0 |
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| 246 | |
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| 247 | IF( ln_asmiau .AND. & |
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| 248 | & ln_dyninc ) CALL dyn_asm_inc( kstp ) ! apply dynamics assimilation increment |
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| 249 | IF( ln_bkgwri ) CALL asm_bkg_wri( kstp ) ! output background fields |
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| 250 | IF( ln_neptsimp ) CALL dyn_nept_cor( kstp ) ! subtract Neptune velocities (simplified) |
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| 251 | IF( lk_bdy ) CALL bdy_dyn3d_dmp(kstp ) ! bdy damping trends |
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| 252 | CALL dyn_adv( kstp ) ! advection (vector or flux form) |
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| 253 | CALL dyn_vor( kstp ) ! vorticity term including Coriolis |
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| 254 | CALL dyn_ldf( kstp ) ! lateral mixing |
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| 255 | IF( ln_neptsimp ) CALL dyn_nept_cor( kstp ) ! add Neptune velocities (simplified) |
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| 256 | #if defined key_agrif |
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| 257 | IF(.NOT. Agrif_Root()) CALL Agrif_Sponge_dyn ! momemtum sponge |
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| 258 | #endif |
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| 259 | CALL dyn_hpg( kstp ) ! horizontal gradient of Hydrostatic pressure |
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| 260 | CALL dyn_bfr( kstp ) ! bottom friction |
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| 261 | CALL dyn_zdf( kstp ) ! vertical diffusion |
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| 262 | CALL dyn_spg( kstp, indic ) ! surface pressure gradient |
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| 263 | ! bg jchanut tschanges |
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| 264 | #endif |
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| 265 | ! end jchanut tschanges |
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| 266 | CALL dyn_nxt( kstp ) ! lateral velocity at next time step |
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| 267 | |
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| 268 | CALL ssh_nxt( kstp ) ! sea surface height at next time step |
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| 269 | |
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| 270 | IF( ln_diahsb ) CALL dia_hsb( kstp ) ! - ML - global conservation diagnostics |
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| 271 | IF( lk_diaobs ) CALL dia_obs( kstp ) ! obs-minus-model (assimilation) diagnostics (call after dynamics update) |
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| 272 | |
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| 273 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 274 | ! Control and restarts |
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| 275 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 276 | CALL stp_ctl( kstp, indic ) |
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| 277 | IF( indic < 0 ) THEN |
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| 278 | CALL ctl_stop( 'step: indic < 0' ) |
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| 279 | CALL dia_wri_state( 'output.abort', kstp ) |
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| 280 | ENDIF |
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| 281 | IF( kstp == nit000 ) CALL iom_close( numror ) ! close input ocean restart file |
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| 282 | IF( lrst_oce ) CALL rst_write ( kstp ) ! write output ocean restart file |
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| 283 | IF( lk_obc ) CALL obc_rst_write( kstp ) ! write open boundary restart file |
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| 284 | |
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| 285 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 286 | ! Trends (ua, va, tsa used as workspace) |
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| 287 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 288 | IF( nstop == 0 ) THEN |
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| 289 | IF( lk_trddyn ) CALL trd_dwr( kstp ) ! trends: dynamics |
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| 290 | IF( lk_trdtra ) CALL trd_twr( kstp ) ! trends: active tracers |
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| 291 | IF( lk_trdmld ) CALL trd_mld( kstp ) ! trends: Mixed-layer |
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| 292 | IF( lk_trdvor ) CALL trd_vor( kstp ) ! trends: vorticity budget |
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| 293 | ENDIF |
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| 294 | |
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| 295 | !>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> |
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| 296 | ! Coupled mode |
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| 297 | !<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< |
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| 298 | IF( lk_cpl ) CALL sbc_cpl_snd( kstp ) ! coupled mode : field exchanges |
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| 299 | ! |
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| 300 | #if defined key_iomput |
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| 301 | IF( kstp == nitend .OR. indic < 0 ) CALL xios_context_finalize() ! needed for XIOS+AGRIF |
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| 302 | #endif |
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| 303 | ! |
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| 304 | IF( nn_timing == 1 .AND. kstp == nit000 ) CALL timing_reset |
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| 305 | ! |
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| 306 | END SUBROUTINE stp |
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| 307 | |
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| 308 | !!====================================================================== |
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| 309 | END MODULE step |
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