[3] | 1 | MODULE tranxt |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE tranxt *** |
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| 4 | !! Ocean active tracers: time stepping on temperature and salinity |
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| 5 | !!====================================================================== |
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| 6 | |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | !! tra_nxt : time stepping on temperature and salinity |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! * Modules used |
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| 11 | USE oce ! ocean dynamics and tracers variables |
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| 12 | USE dom_oce ! ocean space and time domain variables |
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| 13 | USE zdf_oce ! ??? |
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| 14 | USE in_out_manager ! I/O manager |
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| 15 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 16 | USE obctra ! open boundary condition (obc_tra routine) |
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[258] | 17 | USE prtctl ! Print control |
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[389] | 18 | USE agrif_opa_update |
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| 19 | USE agrif_opa_interp |
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[3] | 20 | |
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| 21 | IMPLICIT NONE |
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| 22 | PRIVATE |
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| 23 | |
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| 24 | !! * Routine accessibility |
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| 25 | PUBLIC tra_nxt ! routine called by step.F90 |
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| 26 | !!---------------------------------------------------------------------- |
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[247] | 27 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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| 28 | !! $Header$ |
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| 29 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 30 | !!---------------------------------------------------------------------- |
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| 31 | |
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| 32 | CONTAINS |
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| 33 | |
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| 34 | SUBROUTINE tra_nxt( kt ) |
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| 35 | !!---------------------------------------------------------------------- |
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| 36 | !! *** ROUTINE tranxt *** |
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| 37 | !! |
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| 38 | !! ** Purpose : Compute the temperature and salinity fields at the |
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| 39 | !! next time-step from their temporal trends and swap the fields. |
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| 40 | !! |
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| 41 | !! ** Method : Apply lateral boundary conditions on (ua,va) through |
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| 42 | !! call to lbc_lnk routine |
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| 43 | !! After t and s are compute using a leap-frog scheme environment: |
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| 44 | !! ta = tb + 2 rdttra(k) * ta |
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| 45 | !! sa = sb + 2 rdttra(k) * sa |
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| 46 | !! Compute and save in (ta,sa) an average over three time levels |
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| 47 | !! (before,now and after) of temperature and salinity which is |
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| 48 | !! used to compute rhd in eos routine and thus the hydrostatic |
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| 49 | !! pressure gradient (ln_dynhpg_imp = T) |
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| 50 | !! Apply an Asselin time filter on now tracers (tn,sn) to avoid |
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| 51 | !! the divergence of two consecutive time-steps and swap tracer |
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| 52 | !! arrays to prepare the next time_step: |
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| 53 | !! (zt,zs) = (ta+2tn+tb,sa+2sn+sb)/4 (ln_dynhpg_imp = T) |
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| 54 | !! (zt,zs) = (0,0) (default option) |
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| 55 | !! (tb,sb) = (tn,vn) + atfp [ (tb,sb) + (ta,sa) - 2 (tn,sn) ] |
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| 56 | !! (tn,sn) = (ta,sa) |
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| 57 | !! (ta,sa) = (zt,zs) (NB: reset to 0 after use in eos.F) |
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| 58 | !! |
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| 59 | !! ** Action : - update (tb,sb) and (tn,sn) |
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| 60 | !! - (ta,sa) time averaged (t,s) (ln_dynhpg_imp = T) |
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| 61 | !! |
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| 62 | !! History : |
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| 63 | !! 7.0 ! 91-11 (G. Madec) Original code |
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| 64 | !! ! 93-03 (M. Guyon) symetrical conditions |
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| 65 | !! ! 96-02 (G. Madec & M. Imbard) opa release 8.0 |
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| 66 | !! 8.0 ! 96-04 (A. Weaver) Euler forward step |
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| 67 | !! 8.2 ! 99-02 (G. Madec, N. Grima) semi-implicit pressure grad. |
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| 68 | !! 8.5 ! 02-08 (G. Madec) F90: Free form and module |
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| 69 | !! ! 02-11 (C. Talandier, A-M Treguier) Open boundaries |
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| 70 | !!---------------------------------------------------------------------- |
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| 71 | !! * Arguments |
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| 72 | INTEGER, INTENT( in ) :: kt ! ocean time-step index |
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| 73 | |
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| 74 | !! * Local declarations |
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| 75 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 76 | REAL(wp) :: zt, zs ! temporary scalars |
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| 77 | REAL(wp) :: zfact ! temporary scalar |
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| 78 | !!---------------------------------------------------------------------- |
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| 79 | |
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| 80 | |
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| 81 | ! 0. Lateral boundary conditions on ( ta, sa ) (T-point, unchanged sign) |
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| 82 | ! ---------------------------------============ |
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| 83 | CALL lbc_lnk( ta, 'T', 1. ) |
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| 84 | CALL lbc_lnk( sa, 'T', 1. ) |
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| 85 | |
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| 86 | |
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| 87 | ! ! =============== |
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| 88 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 89 | ! ! =============== |
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| 90 | |
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| 91 | ! 1. Leap-frog scheme (only in explicit case, otherwise the |
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| 92 | ! ------------------- time stepping is already done in trazdf) |
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| 93 | IF( l_trazdf_exp ) THEN |
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| 94 | zfact = 2. * rdttra(jk) |
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| 95 | IF( neuler == 0 .AND. kt == nit000 ) zfact = rdttra(jk) |
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| 96 | ta(:,:,jk) = ( tb(:,:,jk) + zfact * ta(:,:,jk) ) * tmask(:,:,jk) |
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| 97 | sa(:,:,jk) = ( sb(:,:,jk) + zfact * sa(:,:,jk) ) * tmask(:,:,jk) |
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| 98 | ENDIF |
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| 99 | |
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| 100 | #if defined key_obc |
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| 101 | ! ! =============== |
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| 102 | END DO ! End of slab |
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| 103 | ! ! =============== |
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| 104 | |
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| 105 | ! Update tracers on open boundaries. |
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| 106 | CALL obc_tra( kt ) |
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| 107 | |
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| 108 | ! ! =============== |
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| 109 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 110 | ! ! =============== |
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| 111 | #endif |
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[389] | 112 | #if defined key_AGRIF |
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| 113 | ! ! =============== |
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| 114 | END DO ! End of slab |
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| 115 | ! ! =============== |
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[3] | 116 | |
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[389] | 117 | ! Update tracers on open boundaries. |
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| 118 | CALL Agrif_tra( kt ) |
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[3] | 119 | |
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[389] | 120 | ! ! =============== |
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| 121 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 122 | ! ! =============== |
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| 123 | #endif |
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| 124 | |
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| 125 | |
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[3] | 126 | ! 2. Time filter and swap of arrays |
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| 127 | ! --------------------------------- |
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| 128 | |
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| 129 | IF( ln_dynhpg_imp ) THEN ! semi-implicite hpg |
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| 130 | IF( neuler == 0 .AND. kt == nit000 ) THEN |
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| 131 | DO jj = 1, jpj |
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| 132 | DO ji = 1, jpi |
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| 133 | zt = ( ta(ji,jj,jk) + 2. * tn(ji,jj,jk) + tb(ji,jj,jk) ) * 0.25 |
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| 134 | zs = ( sa(ji,jj,jk) + 2. * sn(ji,jj,jk) + sb(ji,jj,jk) ) * 0.25 |
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| 135 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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| 136 | sb(ji,jj,jk) = sn(ji,jj,jk) |
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| 137 | tn(ji,jj,jk) = ta(ji,jj,jk) |
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| 138 | sn(ji,jj,jk) = sa(ji,jj,jk) |
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| 139 | ta(ji,jj,jk) = zt |
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| 140 | sa(ji,jj,jk) = zs |
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| 141 | END DO |
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| 142 | END DO |
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| 143 | ELSE |
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| 144 | DO jj = 1, jpj |
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| 145 | DO ji = 1, jpi |
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| 146 | zt = ( ta(ji,jj,jk) + 2. * tn(ji,jj,jk) + tb(ji,jj,jk) ) * 0.25 |
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| 147 | zs = ( sa(ji,jj,jk) + 2. * sn(ji,jj,jk) + sb(ji,jj,jk) ) * 0.25 |
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| 148 | tb(ji,jj,jk) = atfp * ( tb(ji,jj,jk) + ta(ji,jj,jk) ) + atfp1 * tn(ji,jj,jk) |
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| 149 | sb(ji,jj,jk) = atfp * ( sb(ji,jj,jk) + sa(ji,jj,jk) ) + atfp1 * sn(ji,jj,jk) |
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| 150 | tn(ji,jj,jk) = ta(ji,jj,jk) |
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| 151 | sn(ji,jj,jk) = sa(ji,jj,jk) |
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| 152 | ta(ji,jj,jk) = zt |
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| 153 | sa(ji,jj,jk) = zs |
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| 154 | END DO |
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| 155 | END DO |
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| 156 | ENDIF |
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| 157 | ELSE ! Default case |
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| 158 | IF( neuler == 0 .AND. kt == nit000 ) THEN |
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| 159 | DO jj = 1, jpj |
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| 160 | DO ji = 1, jpi |
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| 161 | tb(ji,jj,jk) = tn(ji,jj,jk) |
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| 162 | sb(ji,jj,jk) = sn(ji,jj,jk) |
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| 163 | tn(ji,jj,jk) = ta(ji,jj,jk) |
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| 164 | sn(ji,jj,jk) = sa(ji,jj,jk) |
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| 165 | END DO |
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| 166 | END DO |
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| 167 | ELSE |
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| 168 | DO jj = 1, jpj |
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| 169 | DO ji = 1, jpi |
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| 170 | tb(ji,jj,jk) = atfp * ( tb(ji,jj,jk) + ta(ji,jj,jk) ) + atfp1 * tn(ji,jj,jk) |
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| 171 | sb(ji,jj,jk) = atfp * ( sb(ji,jj,jk) + sa(ji,jj,jk) ) + atfp1 * sn(ji,jj,jk) |
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| 172 | tn(ji,jj,jk) = ta(ji,jj,jk) |
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| 173 | sn(ji,jj,jk) = sa(ji,jj,jk) |
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| 174 | END DO |
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| 175 | END DO |
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| 176 | ENDIF |
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| 177 | ENDIF |
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| 178 | ! ! =============== |
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| 179 | END DO ! End of slab |
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| 180 | ! ! =============== |
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| 181 | |
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[258] | 182 | IF(ln_ctl) THEN ! print mean field (used for debugging) |
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| 183 | CALL prt_ctl(tab3d_1=tn, clinfo1=' nxt - Tn: ', mask1=tmask, & |
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| 184 | & tab3d_2=sn, clinfo2=' Sn: ', mask2=tmask) |
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[3] | 185 | ENDIF |
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[389] | 186 | |
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| 187 | #if defined key_AGRIF |
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| 188 | IF (.NOT.Agrif_Root()) CALL Agrif_Update_Tra( kt ) |
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| 189 | #endif |
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[3] | 190 | |
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| 191 | END SUBROUTINE tra_nxt |
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| 192 | |
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| 193 | !!====================================================================== |
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| 194 | END MODULE tranxt |
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