[3] | 1 | MODULE tranxt |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE tranxt *** |
---|
| 4 | !! Ocean active tracers: time stepping on temperature and salinity |
---|
| 5 | !!====================================================================== |
---|
[1110] | 6 | !! History : OPA ! 1991-11 (G. Madec) Original code |
---|
| 7 | !! 7.0 ! 1993-03 (M. Guyon) symetrical conditions |
---|
| 8 | !! 8.0 ! 1996-02 (G. Madec & M. Imbard) opa release 8.0 |
---|
| 9 | !! - ! 1996-04 (A. Weaver) Euler forward step |
---|
| 10 | !! 8.2 ! 1999-02 (G. Madec, N. Grima) semi-implicit pressure grad. |
---|
| 11 | !! NEMO 1.0 ! 2002-08 (G. Madec) F90: Free form and module |
---|
| 12 | !! - ! 2002-11 (C. Talandier, A-M Treguier) Open boundaries |
---|
| 13 | !! - ! 2005-04 (C. Deltel) Add Asselin trend in the ML budget |
---|
| 14 | !! 2.0 ! 2006-02 (L. Debreu, C. Mazauric) Agrif implementation |
---|
| 15 | !! 3.0 ! 2008-06 (G. Madec) time stepping always done in trazdf |
---|
[3] | 16 | !!---------------------------------------------------------------------- |
---|
[503] | 17 | |
---|
| 18 | !!---------------------------------------------------------------------- |
---|
[1110] | 19 | !! tra_nxt : time stepping on temperature and salinity |
---|
[3] | 20 | !!---------------------------------------------------------------------- |
---|
| 21 | USE oce ! ocean dynamics and tracers variables |
---|
| 22 | USE dom_oce ! ocean space and time domain variables |
---|
| 23 | USE zdf_oce ! ??? |
---|
[888] | 24 | USE dynspg_oce ! surface pressure gradient variables |
---|
| 25 | USE trdmod_oce ! ocean variables trends |
---|
| 26 | USE trdmod ! ocean active tracers trends |
---|
| 27 | USE phycst |
---|
| 28 | USE obctra ! open boundary condition (obc_tra routine) |
---|
[911] | 29 | USE bdytra ! Unstructured open boundary condition (bdy_tra routine) |
---|
[3] | 30 | USE in_out_manager ! I/O manager |
---|
| 31 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
---|
[258] | 32 | USE prtctl ! Print control |
---|
[389] | 33 | USE agrif_opa_update |
---|
| 34 | USE agrif_opa_interp |
---|
[3] | 35 | |
---|
| 36 | IMPLICIT NONE |
---|
| 37 | PRIVATE |
---|
| 38 | |
---|
[1110] | 39 | PUBLIC tra_nxt ! routine called by step.F90 |
---|
[592] | 40 | |
---|
| 41 | !! * Substitutions |
---|
| 42 | # include "domzgr_substitute.h90" |
---|
[3] | 43 | !!---------------------------------------------------------------------- |
---|
[1110] | 44 | !! NEMO/OPA 3.0 , LOCEAN-IPSL (2008) |
---|
| 45 | !! $Id:$ |
---|
[503] | 46 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
[3] | 47 | !!---------------------------------------------------------------------- |
---|
| 48 | |
---|
| 49 | CONTAINS |
---|
| 50 | |
---|
| 51 | SUBROUTINE tra_nxt( kt ) |
---|
| 52 | !!---------------------------------------------------------------------- |
---|
| 53 | !! *** ROUTINE tranxt *** |
---|
| 54 | !! |
---|
[1110] | 55 | !! ** Purpose : Apply the boundary condition on the after temperature |
---|
| 56 | !! and salinity fields, achieved the time stepping by adding |
---|
| 57 | !! the Asselin filter on now fields and swapping the fields. |
---|
[3] | 58 | !! |
---|
[1110] | 59 | !! ** Method : At this stage of the computation, ta and sa are the |
---|
| 60 | !! after temperature and salinity as the time stepping has |
---|
| 61 | !! been performed in trazdf_imp or trazdf_exp module. |
---|
[3] | 62 | !! |
---|
[1110] | 63 | !! - Apply lateral boundary conditions on (ta,sa) |
---|
| 64 | !! at the local domain boundaries through lbc_lnk call, |
---|
| 65 | !! at the radiative open boundaries (lk_obc=T), |
---|
| 66 | !! at the relaxed open boundaries (lk_bdy=T), and |
---|
| 67 | !! at the AGRIF zoom boundaries (lk_agrif=T) |
---|
| 68 | !! |
---|
| 69 | !! - Apply the Asselin time filter on now fields, |
---|
| 70 | !! save in (ta,sa) an average over the three time levels |
---|
| 71 | !! which will be used to compute rdn and thus the semi-implicit |
---|
| 72 | !! hydrostatic pressure gradient (ln_dynhpg_imp = T), and |
---|
| 73 | !! swap tracer fields to prepare the next time_step. |
---|
| 74 | !! This can be summurized for tempearture as: |
---|
| 75 | !! zt = (ta+2tn+tb)/4 ln_dynhpg_imp = T |
---|
| 76 | !! zt = 0 otherwise |
---|
| 77 | !! tb = tn + atfp*[ tb - 2 tn + ta ] |
---|
| 78 | !! tn = ta |
---|
| 79 | !! ta = zt (NB: reset to 0 after eos_bn2 call) |
---|
| 80 | !! |
---|
| 81 | !! ** Action : - (tb,sb) and (tn,sn) ready for the next time step |
---|
| 82 | !! - (ta,sa) time averaged (t,s) (ln_dynhpg_imp = T) |
---|
[503] | 83 | !!---------------------------------------------------------------------- |
---|
| 84 | USE oce, ONLY : ztrdt => ua ! use ua as 3D workspace |
---|
| 85 | USE oce, ONLY : ztrds => va ! use va as 3D workspace |
---|
[3] | 86 | !! |
---|
[503] | 87 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
---|
| 88 | !! |
---|
[642] | 89 | INTEGER :: ji, jj, jk ! dummy loop indices |
---|
[1110] | 90 | REAL(wp) :: zt, zs, zfact ! temporary scalars |
---|
[3] | 91 | !!---------------------------------------------------------------------- |
---|
| 92 | |
---|
[1110] | 93 | IF( kt == nit000 ) THEN |
---|
| 94 | IF(lwp) WRITE(numout,*) |
---|
| 95 | IF(lwp) WRITE(numout,*) 'tra_nxt : achieve the time stepping by Asselin filter and array swap' |
---|
| 96 | IF(lwp) WRITE(numout,*) '~~~~~~~' |
---|
[592] | 97 | ENDIF |
---|
| 98 | |
---|
[1110] | 99 | ! Update after tracer on domain lateral boundaries |
---|
| 100 | ! |
---|
| 101 | CALL lbc_lnk( ta, 'T', 1. ) ! local domain boundaries (T-point, unchanged sign) |
---|
[3] | 102 | CALL lbc_lnk( sa, 'T', 1. ) |
---|
[1110] | 103 | ! |
---|
[3] | 104 | #if defined key_obc |
---|
[1110] | 105 | CALL obc_tra( kt ) ! OBC open boundaries |
---|
[3] | 106 | #endif |
---|
[1110] | 107 | #if defined key_bdy |
---|
| 108 | CALL bdy_tra( kt ) ! BDY open boundaries |
---|
| 109 | #endif |
---|
[392] | 110 | #if defined key_agrif |
---|
[1110] | 111 | CALL Agrif_tra ! AGRIF zoom boundaries |
---|
[389] | 112 | #endif |
---|
[3] | 113 | |
---|
[1110] | 114 | ! trends computation initialisation |
---|
| 115 | IF( l_trdtra ) THEN ! store now fields before applying the Asselin filter |
---|
| 116 | ztrdt(:,:,:) = tn(:,:,:) |
---|
| 117 | ztrds(:,:,:) = sn(:,:,:) |
---|
| 118 | ENDIF |
---|
| 119 | |
---|
| 120 | ! Asselin time filter and swap of arrays |
---|
| 121 | ! |
---|
| 122 | IF( neuler == 0 .AND. kt == nit000 ) THEN ! Euler 1st time step : swap only |
---|
| 123 | DO jk = 1, jpkm1 |
---|
| 124 | tb(:,:,jk) = tn(:,:,jk) ! ta, sa remain at their values which |
---|
| 125 | sb(:,:,jk) = sn(:,:,jk) ! correspond to tn, sn after the sawp |
---|
| 126 | tn(:,:,jk) = ta(:,:,jk) |
---|
| 127 | sn(:,:,jk) = sa(:,:,jk) |
---|
| 128 | END DO |
---|
| 129 | ! |
---|
| 130 | ELSE ! Leap-Frog : filter + swap |
---|
| 131 | ! |
---|
| 132 | IF( ln_dynhpg_imp ) THEN ! semi-implicite hpg case |
---|
| 133 | DO jk = 1, jpkm1 ! (save the averaged of the 3 time steps |
---|
| 134 | DO jj = 1, jpj ! in the after fields) |
---|
[3] | 135 | DO ji = 1, jpi |
---|
| 136 | zt = ( ta(ji,jj,jk) + 2. * tn(ji,jj,jk) + tb(ji,jj,jk) ) * 0.25 |
---|
| 137 | zs = ( sa(ji,jj,jk) + 2. * sn(ji,jj,jk) + sb(ji,jj,jk) ) * 0.25 |
---|
[1110] | 138 | tb(ji,jj,jk) = atfp * ( tb(ji,jj,jk) + ta(ji,jj,jk) ) + atfp1 * tn(ji,jj,jk) |
---|
| 139 | sb(ji,jj,jk) = atfp * ( sb(ji,jj,jk) + sa(ji,jj,jk) ) + atfp1 * sn(ji,jj,jk) |
---|
[3] | 140 | tn(ji,jj,jk) = ta(ji,jj,jk) |
---|
| 141 | sn(ji,jj,jk) = sa(ji,jj,jk) |
---|
| 142 | ta(ji,jj,jk) = zt |
---|
| 143 | sa(ji,jj,jk) = zs |
---|
| 144 | END DO |
---|
| 145 | END DO |
---|
[1110] | 146 | END DO |
---|
| 147 | ELSE ! explicit hpg case |
---|
| 148 | DO jk = 1, jpkm1 |
---|
[3] | 149 | DO jj = 1, jpj |
---|
| 150 | DO ji = 1, jpi |
---|
[1110] | 151 | tb(ji,jj,jk) = atfp * ( tb(ji,jj,jk) + ta(ji,jj,jk) ) + atfp1 * tn(ji,jj,jk) |
---|
| 152 | sb(ji,jj,jk) = atfp * ( sb(ji,jj,jk) + sa(ji,jj,jk) ) + atfp1 * sn(ji,jj,jk) |
---|
[3] | 153 | tn(ji,jj,jk) = ta(ji,jj,jk) |
---|
| 154 | sn(ji,jj,jk) = sa(ji,jj,jk) |
---|
| 155 | END DO |
---|
| 156 | END DO |
---|
[1110] | 157 | END DO |
---|
[3] | 158 | ENDIF |
---|
[1110] | 159 | ! |
---|
| 160 | ENDIF |
---|
[3] | 161 | |
---|
[1110] | 162 | #if defined key_agrif |
---|
| 163 | ! Update tracer at AGRIF zoom boundaries |
---|
| 164 | IF( .NOT.Agrif_Root() ) CALL Agrif_Update_Tra( kt ) ! children only |
---|
| 165 | #endif |
---|
| 166 | |
---|
| 167 | ! trends diagnostics : Asselin filter trend : (tb filtered - tb)/2dt |
---|
| 168 | IF( l_trdtra ) THEN |
---|
| 169 | DO jk = 1, jpkm1 |
---|
| 170 | zfact = 1.e0 / ( 2.*rdttra(jk) ) ! NB: euler case, (tb filtered - tb)=0 so 2dt always OK |
---|
| 171 | ztrdt(:,:,jk) = ( tb(:,:,jk) - ztrdt(:,:,jk) ) * zfact |
---|
| 172 | ztrds(:,:,jk) = ( sb(:,:,jk) - ztrds(:,:,jk) ) * zfact |
---|
| 173 | END DO |
---|
[503] | 174 | CALL trd_mod( ztrdt, ztrds, jptra_trd_atf, 'TRA', kt ) |
---|
| 175 | END IF |
---|
[1110] | 176 | ! ! control print |
---|
[503] | 177 | IF(ln_ctl) CALL prt_ctl( tab3d_1=tn, clinfo1=' nxt - Tn: ', mask1=tmask, & |
---|
| 178 | & tab3d_2=sn, clinfo2= ' Sn: ', mask2=tmask ) |
---|
| 179 | ! |
---|
[3] | 180 | END SUBROUTINE tra_nxt |
---|
| 181 | |
---|
| 182 | !!====================================================================== |
---|
| 183 | END MODULE tranxt |
---|