[941] | 1 | MODULE trcnxt |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE trcnxt *** |
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| 4 | !! Ocean passive tracers: time stepping on passives tracers |
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| 5 | !!====================================================================== |
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[2528] | 6 | !! History : 7.0 ! 1991-11 (G. Madec) Original code |
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| 7 | !! ! 1993-03 (M. Guyon) symetrical conditions |
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| 8 | !! ! 1995-02 (M. Levy) passive tracers |
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| 9 | !! ! 1996-02 (G. Madec & M. Imbard) opa release 8.0 |
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| 10 | !! 8.0 ! 1996-04 (A. Weaver) Euler forward step |
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| 11 | !! 8.2 ! 1999-02 (G. Madec, N. Grima) semi-implicit pressure grad. |
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| 12 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
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| 13 | !! ! 2002-08 (G. Madec) F90: Free form and module |
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| 14 | !! ! 2002-11 (C. Talandier, A-M Treguier) Open boundaries |
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| 15 | !! ! 2004-03 (C. Ethe) passive tracers |
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| 16 | !! ! 2007-02 (C. Deltel) Diagnose ML trends for passive tracers |
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| 17 | !! 2.0 ! 2006-02 (L. Debreu, C. Mazauric) Agrif implementation |
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| 18 | !! 3.0 ! 2008-06 (G. Madec) time stepping always done in trazdf |
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| 19 | !! 3.1 ! 2009-02 (G. Madec, R. Benshila) re-introduce the vvl option |
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| 20 | !! 3.3 ! 2010-06 (C. Ethe, G. Madec) Merge TRA-TRC |
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[1175] | 21 | !!---------------------------------------------------------------------- |
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[941] | 22 | #if defined key_top |
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| 23 | !!---------------------------------------------------------------------- |
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| 24 | !! 'key_top' TOP models |
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| 25 | !!---------------------------------------------------------------------- |
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| 26 | !! trc_nxt : time stepping on passive tracers |
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| 27 | !!---------------------------------------------------------------------- |
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| 28 | USE oce_trc ! ocean dynamics and tracers variables |
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[2528] | 29 | USE trc ! ocean passive tracers variables |
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[941] | 30 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 31 | USE prtctl_trc ! Print control for debbuging |
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[4990] | 32 | USE trd_oce |
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[2528] | 33 | USE trdtra |
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| 34 | USE tranxt |
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[7646] | 35 | USE bdy_oce , ONLY: ln_bdy |
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[6140] | 36 | USE trcbdy ! BDY open boundaries |
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[2528] | 37 | # if defined key_agrif |
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[941] | 38 | USE agrif_top_interp |
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[2528] | 39 | # endif |
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[941] | 40 | |
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| 41 | IMPLICIT NONE |
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| 42 | PRIVATE |
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| 43 | |
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[2715] | 44 | PUBLIC trc_nxt ! routine called by step.F90 |
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[2528] | 45 | |
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[7872] | 46 | REAL(wp) :: r2dttrc, rfact1, rfact2 |
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| 47 | |
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[941] | 48 | !!---------------------------------------------------------------------- |
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[2528] | 49 | !! NEMO/TOP 3.3 , NEMO Consortium (2010) |
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[7753] | 50 | !! $Id$ |
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[2715] | 51 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[941] | 52 | !!---------------------------------------------------------------------- |
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| 53 | CONTAINS |
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| 54 | |
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| 55 | SUBROUTINE trc_nxt( kt ) |
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| 56 | !!---------------------------------------------------------------------- |
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| 57 | !! *** ROUTINE trcnxt *** |
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| 58 | !! |
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| 59 | !! ** Purpose : Compute the passive tracers fields at the |
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| 60 | !! next time-step from their temporal trends and swap the fields. |
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| 61 | !! |
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| 62 | !! ** Method : Apply lateral boundary conditions on (ua,va) through |
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| 63 | !! call to lbc_lnk routine |
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| 64 | !! default: |
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| 65 | !! arrays swap |
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| 66 | !! (trn) = (tra) ; (tra) = (0,0) |
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| 67 | !! (trb) = (trn) |
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| 68 | !! |
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| 69 | !! For Arakawa or TVD Scheme : |
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| 70 | !! A Asselin time filter applied on now tracers (trn) to avoid |
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| 71 | !! the divergence of two consecutive time-steps and tr arrays |
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| 72 | !! to prepare the next time_step: |
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| 73 | !! (trb) = (trn) + atfp [ (trb) + (tra) - 2 (trn) ] |
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| 74 | !! (trn) = (tra) ; (tra) = (0,0) |
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| 75 | !! |
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| 76 | !! |
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| 77 | !! ** Action : - update trb, trn |
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| 78 | !!---------------------------------------------------------------------- |
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[1271] | 79 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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[2715] | 80 | ! |
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[7753] | 81 | INTEGER :: jk, jn ! dummy loop indices |
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[941] | 82 | REAL(wp) :: zfact ! temporary scalar |
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| 83 | CHARACTER (len=22) :: charout |
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[3294] | 84 | REAL(wp), POINTER, DIMENSION(:,:,:,:) :: ztrdt |
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[941] | 85 | !!---------------------------------------------------------------------- |
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[3294] | 86 | ! |
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| 87 | IF( nn_timing == 1 ) CALL timing_start('trc_nxt') |
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| 88 | ! |
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| 89 | IF( kt == nittrc000 .AND. lwp ) THEN |
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[941] | 90 | WRITE(numout,*) |
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| 91 | WRITE(numout,*) 'trc_nxt : time stepping on passive tracers' |
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| 92 | ENDIF |
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[6140] | 93 | ! |
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[5656] | 94 | #if defined key_agrif |
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| 95 | CALL Agrif_trc ! AGRIF zoom boundaries |
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| 96 | #endif |
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[6140] | 97 | DO jn = 1, jptra ! Update after tracer on domain lateral boundaries |
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[941] | 98 | CALL lbc_lnk( tra(:,:,:,jn), 'T', 1. ) |
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[2528] | 99 | END DO |
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[941] | 100 | |
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[7646] | 101 | IF( ln_bdy ) CALL trc_bdy( kt ) |
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[941] | 102 | |
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[6140] | 103 | IF( l_trdtrc ) THEN ! trends: store now fields before the Asselin filter application |
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| 104 | CALL wrk_alloc( jpi, jpj, jpk, jptra, ztrdt ) |
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[7753] | 105 | ztrdt(:,:,:,:) = trn(:,:,:,:) |
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[2528] | 106 | ENDIF |
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[6140] | 107 | ! ! Leap-Frog + Asselin filter time stepping |
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| 108 | IF( neuler == 0 .AND. kt == nittrc000 ) THEN ! Euler time-stepping at first time-step (only swap) |
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[2528] | 109 | DO jn = 1, jptra |
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| 110 | DO jk = 1, jpkm1 |
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[7753] | 111 | trn(:,:,jk,jn) = tra(:,:,jk,jn) |
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[2528] | 112 | END DO |
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| 113 | END DO |
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[7872] | 114 | ELSE |
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| 115 | IF( .NOT. lk_offline ) THEN ! Leap-Frog + Asselin filter time stepping |
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| 116 | IF( ln_linssh ) THEN ; CALL tra_nxt_fix( kt, nittrc000, 'TRC', trb, trn, tra, jptra ) ! linear ssh |
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| 117 | ELSE ; CALL tra_nxt_vvl( kt, nittrc000, rdttrc, 'TRC', trb, trn, tra, & |
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| 118 | & sbc_trc, sbc_trc_b, jptra ) ! non-linear ssh |
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| 119 | ENDIF |
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| 120 | ELSE |
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| 121 | CALL trc_nxt_off( kt ) ! offline |
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[2528] | 122 | ENDIF |
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[6140] | 123 | ! |
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| 124 | DO jn = 1, jptra |
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| 125 | CALL lbc_lnk( trb(:,:,:,jn), 'T', 1._wp ) |
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| 126 | CALL lbc_lnk( trn(:,:,:,jn), 'T', 1._wp ) |
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| 127 | CALL lbc_lnk( tra(:,:,:,jn), 'T', 1._wp ) |
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| 128 | END DO |
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[2528] | 129 | ENDIF |
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[6140] | 130 | ! |
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| 131 | IF( l_trdtrc ) THEN ! trends: send Asselin filter trends to trdtra manager for further diagnostics |
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[2528] | 132 | DO jn = 1, jptra |
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| 133 | DO jk = 1, jpkm1 |
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[6140] | 134 | zfact = 1._wp / r2dttrc |
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[7753] | 135 | ztrdt(:,:,jk,jn) = ( trb(:,:,jk,jn) - ztrdt(:,:,jk,jn) ) * zfact |
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[4990] | 136 | CALL trd_tra( kt, 'TRC', jn, jptra_atf, ztrdt ) |
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[1175] | 137 | END DO |
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[2528] | 138 | END DO |
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[3294] | 139 | CALL wrk_dealloc( jpi, jpj, jpk, jptra, ztrdt ) |
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[2528] | 140 | END IF |
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| 141 | ! |
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[941] | 142 | IF(ln_ctl) THEN ! print mean trends (used for debugging) |
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| 143 | WRITE(charout, FMT="('nxt')") |
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| 144 | CALL prt_ctl_trc_info(charout) |
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| 145 | CALL prt_ctl_trc(tab4d=trn, mask=tmask, clinfo=ctrcnm) |
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| 146 | ENDIF |
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[2528] | 147 | ! |
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[3294] | 148 | IF( nn_timing == 1 ) CALL timing_stop('trc_nxt') |
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| 149 | ! |
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[941] | 150 | END SUBROUTINE trc_nxt |
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| 151 | |
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[7872] | 152 | |
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| 153 | SUBROUTINE trc_nxt_off( kt ) |
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| 154 | !!---------------------------------------------------------------------- |
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| 155 | !! *** ROUTINE tra_nxt_vvl *** |
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| 156 | !! |
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| 157 | !! ** Purpose : Time varying volume: apply the Asselin time filter |
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| 158 | !! and swap the tracer fields. |
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| 159 | !! |
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| 160 | !! ** Method : - Apply a thickness weighted Asselin time filter on now fields. |
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| 161 | !! - save in (ta,sa) a thickness weighted average over the three |
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| 162 | !! time levels which will be used to compute rdn and thus the semi- |
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| 163 | !! implicit hydrostatic pressure gradient (ln_dynhpg_imp = T) |
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| 164 | !! - swap tracer fields to prepare the next time_step. |
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| 165 | !! This can be summurized for tempearture as: |
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| 166 | !! ztm = ( e3t_n*tn + rbcp*[ e3t_b*tb - 2 e3t_n*tn + e3t_a*ta ] ) ln_dynhpg_imp = T |
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| 167 | !! /( e3t_n + rbcp*[ e3t_b - 2 e3t_n + e3t_a ] ) |
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| 168 | !! ztm = 0 otherwise |
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| 169 | !! tb = ( e3t_n*tn + atfp*[ e3t_b*tb - 2 e3t_n*tn + e3t_a*ta ] ) |
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| 170 | !! /( e3t_n + atfp*[ e3t_b - 2 e3t_n + e3t_a ] ) |
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| 171 | !! tn = ta |
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| 172 | !! ta = zt (NB: reset to 0 after eos_bn2 call) |
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| 173 | !! |
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| 174 | !! ** Action : - (tb,sb) and (tn,sn) ready for the next time step |
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| 175 | !! - (ta,sa) time averaged (t,s) (ln_dynhpg_imp = T) |
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| 176 | !!---------------------------------------------------------------------- |
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| 177 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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| 178 | !! |
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| 179 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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| 180 | REAL(wp) :: ztc_a , ztc_n , ztc_b , ztc_f , ztc_d ! local scalar |
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| 181 | REAL(wp) :: ze3t_b, ze3t_n, ze3t_a, ze3t_f, ze3t_d ! - - |
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| 182 | !!---------------------------------------------------------------------- |
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| 183 | ! |
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| 184 | IF( kt == nittrc000 ) THEN |
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| 185 | IF(lwp) WRITE(numout,*) |
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| 186 | IF(lwp) WRITE(numout,*) 'trc_nxt_off : time stepping' |
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| 187 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~' |
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| 188 | IF( .NOT. ln_linssh ) THEN |
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| 189 | rfact1 = atfp * rdttrc |
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| 190 | rfact2 = rfact1 / rau0 |
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| 191 | ENDIF |
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| 192 | ! |
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| 193 | ENDIF |
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| 194 | ! |
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| 195 | DO jn = 1, jptra |
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| 196 | DO jk = 1, jpkm1 |
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| 197 | DO jj = 1, jpj |
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| 198 | DO ji = 1, jpi |
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| 199 | ze3t_b = e3t_b(ji,jj,jk) |
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| 200 | ze3t_n = e3t_n(ji,jj,jk) |
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| 201 | ze3t_a = e3t_a(ji,jj,jk) |
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| 202 | ! ! tracer content at Before, now and after |
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| 203 | ztc_b = trb(ji,jj,jk,jn) * ze3t_b |
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| 204 | ztc_n = trn(ji,jj,jk,jn) * ze3t_n |
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| 205 | ztc_a = tra(ji,jj,jk,jn) * ze3t_a |
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| 206 | ! |
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| 207 | ze3t_d = ze3t_a - 2. * ze3t_n + ze3t_b |
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| 208 | ztc_d = ztc_a - 2. * ztc_n + ztc_b |
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| 209 | ! |
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| 210 | ze3t_f = ze3t_n + atfp * ze3t_d |
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| 211 | ztc_f = ztc_n + atfp * ztc_d |
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| 212 | ! |
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| 213 | IF( .NOT. ln_linssh .AND. jk == mikt(ji,jj) ) THEN ! first level |
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| 214 | ze3t_f = ze3t_f - rfact2 * ( emp_b(ji,jj) - emp(ji,jj) ) |
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| 215 | ztc_f = ztc_f - rfact1 * ( sbc_trc(ji,jj,jn) - sbc_trc_b(ji,jj,jn) ) |
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| 216 | ENDIF |
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| 217 | |
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| 218 | ze3t_f = 1.e0 / ze3t_f |
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| 219 | trb(ji,jj,jk,jn) = ztc_f * ze3t_f ! ptb <-- ptn filtered |
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| 220 | trn(ji,jj,jk,jn) = tra(ji,jj,jk,jn) ! ptn <-- pta |
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| 221 | ! |
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| 222 | END DO |
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| 223 | END DO |
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| 224 | END DO |
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| 225 | ! |
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| 226 | END DO |
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| 227 | ! |
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| 228 | END SUBROUTINE trc_nxt_off |
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| 229 | |
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[941] | 230 | #else |
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| 231 | !!---------------------------------------------------------------------- |
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| 232 | !! Default option Empty module |
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| 233 | !!---------------------------------------------------------------------- |
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| 234 | CONTAINS |
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| 235 | SUBROUTINE trc_nxt( kt ) |
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| 236 | INTEGER, INTENT(in) :: kt |
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| 237 | WRITE(*,*) 'trc_nxt: You should not have seen this print! error?', kt |
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| 238 | END SUBROUTINE trc_nxt |
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| 239 | #endif |
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| 240 | !!====================================================================== |
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| 241 | END MODULE trcnxt |
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