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