[456] | 1 | MODULE dynzdf |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE dynzdf *** |
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| 4 | !! Ocean dynamics : vertical component of the momentum mixing trend |
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| 5 | !!============================================================================== |
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[2528] | 6 | !! History : 1.0 ! 2005-11 (G. Madec) Original code |
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| 7 | !! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase |
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[9019] | 8 | !! 4.0 ! 2017-06 (G. Madec) remove the explicit time-stepping option + avm at t-point |
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[456] | 9 | !!---------------------------------------------------------------------- |
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[503] | 10 | |
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| 11 | !!---------------------------------------------------------------------- |
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[9019] | 12 | !! dyn_zdf : compute the after velocity through implicit calculation of vertical mixing |
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[456] | 13 | !!---------------------------------------------------------------------- |
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[5836] | 14 | USE oce ! ocean dynamics and tracers variables |
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[9019] | 15 | USE phycst ! physical constants |
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[5836] | 16 | USE dom_oce ! ocean space and time domain variables |
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[9019] | 17 | USE sbc_oce ! surface boundary condition: ocean |
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[5836] | 18 | USE zdf_oce ! ocean vertical physics variables |
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[9019] | 19 | USE zdfdrg ! vertical physics: top/bottom drag coef. |
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| 20 | USE dynadv ,ONLY: ln_dynadv_vec ! dynamics: advection form |
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| 21 | USE dynldf_iso,ONLY: akzu, akzv ! dynamics: vertical component of rotated lateral mixing |
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[9490] | 22 | USE ldfdyn ! lateral diffusion: eddy viscosity coef. and type of operator |
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[5836] | 23 | USE trd_oce ! trends: ocean variables |
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| 24 | USE trddyn ! trend manager: dynamics |
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| 25 | ! |
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| 26 | USE in_out_manager ! I/O manager |
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| 27 | USE lib_mpp ! MPP library |
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| 28 | USE prtctl ! Print control |
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| 29 | USE timing ! Timing |
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[456] | 30 | |
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| 31 | IMPLICIT NONE |
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| 32 | PRIVATE |
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| 33 | |
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[9019] | 34 | PUBLIC dyn_zdf ! routine called by step.F90 |
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[456] | 35 | |
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[9019] | 36 | REAL(wp) :: r_vvl ! non-linear free surface indicator: =0 if ln_linssh=T, =1 otherwise |
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[456] | 37 | |
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| 38 | !! * Substitutions |
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| 39 | # include "vectopt_loop_substitute.h90" |
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| 40 | !!---------------------------------------------------------------------- |
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[9019] | 41 | !! NEMO/OPA 4.0 , NEMO Consortium (2017) |
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[1152] | 42 | !! $Id$ |
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[2528] | 43 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[456] | 44 | !!---------------------------------------------------------------------- |
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| 45 | CONTAINS |
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| 46 | |
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| 47 | SUBROUTINE dyn_zdf( kt ) |
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| 48 | !!---------------------------------------------------------------------- |
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| 49 | !! *** ROUTINE dyn_zdf *** |
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| 50 | !! |
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[9019] | 51 | !! ** Purpose : compute the trend due to the vert. momentum diffusion |
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| 52 | !! together with the Leap-Frog time stepping using an |
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| 53 | !! implicit scheme. |
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| 54 | !! |
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| 55 | !! ** Method : - Leap-Frog time stepping on all trends but the vertical mixing |
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| 56 | !! ua = ub + 2*dt * ua vector form or linear free surf. |
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| 57 | !! ua = ( e3u_b*ub + 2*dt * e3u_n*ua ) / e3u_a otherwise |
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| 58 | !! - update the after velocity with the implicit vertical mixing. |
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| 59 | !! This requires to solver the following system: |
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| 60 | !! ua = ua + 1/e3u_a dk+1[ mi(avm) / e3uw_a dk[ua] ] |
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| 61 | !! with the following surface/top/bottom boundary condition: |
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| 62 | !! surface: wind stress input (averaged over kt-1/2 & kt+1/2) |
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| 63 | !! top & bottom : top stress (iceshelf-ocean) & bottom stress (cf zdfdrg.F90) |
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| 64 | !! |
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| 65 | !! ** Action : (ua,va) after velocity |
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[456] | 66 | !!--------------------------------------------------------------------- |
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[9019] | 67 | INTEGER, INTENT(in) :: kt ! ocean time-step index |
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[3294] | 68 | ! |
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[9019] | 69 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 70 | INTEGER :: iku, ikv ! local integers |
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| 71 | REAL(wp) :: zzwi, ze3ua, zdt ! local scalars |
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| 72 | REAL(wp) :: zzws, ze3va ! - - |
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| 73 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zwi, zwd, zws ! 3D workspace |
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| 74 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: ztrdu, ztrdv ! - - |
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[456] | 75 | !!--------------------------------------------------------------------- |
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[3294] | 76 | ! |
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[9019] | 77 | IF( ln_timing ) CALL timing_start('dyn_zdf') |
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[3294] | 78 | ! |
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[9019] | 79 | IF( kt == nit000 ) THEN !* initialization |
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| 80 | IF(lwp) WRITE(numout,*) |
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| 81 | IF(lwp) WRITE(numout,*) 'dyn_zdf_imp : vertical momentum diffusion implicit operator' |
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| 82 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ ' |
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| 83 | ! |
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| 84 | If( ln_linssh ) THEN ; r_vvl = 0._wp ! non-linear free surface indicator |
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| 85 | ELSE ; r_vvl = 1._wp |
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| 86 | ENDIF |
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| 87 | ENDIF |
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| 88 | ! !* set time step |
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[6140] | 89 | IF( neuler == 0 .AND. kt == nit000 ) THEN ; r2dt = rdt ! = rdt (restart with Euler time stepping) |
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| 90 | ELSEIF( kt <= nit000 + 1 ) THEN ; r2dt = 2. * rdt ! = 2 rdt (leapfrog) |
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[456] | 91 | ENDIF |
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[9250] | 92 | ! |
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| 93 | ! !* explicit top/bottom drag case |
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| 94 | IF( .NOT.ln_drgimp ) CALL zdf_drg_exp( kt, ub, vb, ua, va ) ! add top/bottom friction trend to (ua,va) |
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| 95 | ! |
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| 96 | ! |
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[9019] | 97 | IF( l_trddyn ) THEN !* temporary save of ta and sa trends |
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| 98 | ALLOCATE( ztrdu(jpi,jpj,jpk), ztrdv(jpi,jpj,jpk) ) |
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[7753] | 99 | ztrdu(:,:,:) = ua(:,:,:) |
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| 100 | ztrdv(:,:,:) = va(:,:,:) |
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[456] | 101 | ENDIF |
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[9019] | 102 | ! |
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| 103 | ! !== RHS: Leap-Frog time stepping on all trends but the vertical mixing ==! (put in ua,va) |
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| 104 | ! |
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| 105 | ! ! time stepping except vertical diffusion |
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| 106 | IF( ln_dynadv_vec .OR. ln_linssh ) THEN ! applied on velocity |
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| 107 | DO jk = 1, jpkm1 |
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| 108 | ua(:,:,jk) = ( ub(:,:,jk) + r2dt * ua(:,:,jk) ) * umask(:,:,jk) |
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| 109 | va(:,:,jk) = ( vb(:,:,jk) + r2dt * va(:,:,jk) ) * vmask(:,:,jk) |
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| 110 | END DO |
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| 111 | ELSE ! applied on thickness weighted velocity |
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| 112 | DO jk = 1, jpkm1 |
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| 113 | ua(:,:,jk) = ( e3u_b(:,:,jk) * ub(:,:,jk) & |
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| 114 | & + r2dt * e3u_n(:,:,jk) * ua(:,:,jk) ) / e3u_a(:,:,jk) * umask(:,:,jk) |
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| 115 | va(:,:,jk) = ( e3v_b(:,:,jk) * vb(:,:,jk) & |
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| 116 | & + r2dt * e3v_n(:,:,jk) * va(:,:,jk) ) / e3v_a(:,:,jk) * vmask(:,:,jk) |
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| 117 | END DO |
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| 118 | ENDIF |
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| 119 | ! ! add top/bottom friction |
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| 120 | ! With split-explicit free surface, barotropic stress is treated explicitly Update velocities at the bottom. |
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| 121 | ! J. Chanut: The bottom stress is computed considering after barotropic velocities, which does |
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| 122 | ! not lead to the effective stress seen over the whole barotropic loop. |
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| 123 | ! G. Madec : in linear free surface, e3u_a = e3u_n = e3u_0, so systematic use of e3u_a |
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| 124 | IF( ln_drgimp .AND. ln_dynspg_ts ) THEN |
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| 125 | DO jk = 1, jpkm1 ! remove barotropic velocities |
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| 126 | ua(:,:,jk) = ( ua(:,:,jk) - ua_b(:,:) ) * umask(:,:,jk) |
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| 127 | va(:,:,jk) = ( va(:,:,jk) - va_b(:,:) ) * vmask(:,:,jk) |
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| 128 | END DO |
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| 129 | DO jj = 2, jpjm1 ! Add bottom/top stress due to barotropic component only |
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| 130 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 131 | iku = mbku(ji,jj) ! ocean bottom level at u- and v-points |
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| 132 | ikv = mbkv(ji,jj) ! (deepest ocean u- and v-points) |
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| 133 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,iku) + r_vvl * e3u_a(ji,jj,iku) |
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| 134 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,ikv) + r_vvl * e3v_a(ji,jj,ikv) |
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| 135 | ua(ji,jj,iku) = ua(ji,jj,iku) + r2dt * 0.5*( rCdU_bot(ji+1,jj)+rCdU_bot(ji,jj) ) * ua_b(ji,jj) / ze3ua |
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| 136 | va(ji,jj,ikv) = va(ji,jj,ikv) + r2dt * 0.5*( rCdU_bot(ji,jj+1)+rCdU_bot(ji,jj) ) * va_b(ji,jj) / ze3va |
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| 137 | END DO |
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| 138 | END DO |
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| 139 | IF( ln_isfcav ) THEN ! Ocean cavities (ISF) |
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| 140 | DO jj = 2, jpjm1 |
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| 141 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 142 | iku = miku(ji,jj) ! top ocean level at u- and v-points |
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| 143 | ikv = mikv(ji,jj) ! (first wet ocean u- and v-points) |
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| 144 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,iku) + r_vvl * e3u_a(ji,jj,iku) |
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| 145 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,ikv) + r_vvl * e3v_a(ji,jj,ikv) |
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| 146 | ua(ji,jj,iku) = ua(ji,jj,iku) + r2dt * 0.5*( rCdU_top(ji+1,jj)+rCdU_top(ji,jj) ) * ua_b(ji,jj) / ze3ua |
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| 147 | va(ji,jj,ikv) = va(ji,jj,ikv) + r2dt * 0.5*( rCdU_top(ji+1,jj)+rCdU_top(ji,jj) ) * va_b(ji,jj) / ze3va |
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| 148 | END DO |
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| 149 | END DO |
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| 150 | END IF |
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| 151 | ENDIF |
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| 152 | ! |
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| 153 | ! !== Vertical diffusion on u ==! |
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| 154 | ! |
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| 155 | ! !* Matrix construction |
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| 156 | zdt = r2dt * 0.5 |
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[9490] | 157 | SELECT CASE( nldf_dyn ) |
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| 158 | CASE( np_lap_i ) ! rotated lateral mixing: add its vertical mixing (akzu) |
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[9019] | 159 | DO jk = 1, jpkm1 |
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| 160 | DO jj = 2, jpjm1 |
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| 161 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 162 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,jk) + r_vvl * e3u_a(ji,jj,jk) ! after scale factor at T-point |
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| 163 | zzwi = - zdt * ( avm(ji+1,jj,jk ) + avm(ji,jj,jk ) + akzu(ji,jj,jk ) ) & |
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| 164 | & / ( ze3ua * e3uw_n(ji,jj,jk ) ) * wumask(ji,jj,jk ) |
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| 165 | zzws = - zdt * ( avm(ji+1,jj,jk+1) + avm(ji,jj,jk+1) + akzu(ji,jj,jk+1) ) & |
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| 166 | & / ( ze3ua * e3uw_n(ji,jj,jk+1) ) * wumask(ji,jj,jk+1) |
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| 167 | zwi(ji,jj,jk) = zzwi |
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| 168 | zws(ji,jj,jk) = zzws |
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| 169 | zwd(ji,jj,jk) = 1._wp - zzwi - zzws |
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| 170 | END DO |
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| 171 | END DO |
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| 172 | END DO |
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[9490] | 173 | CASE DEFAULT ! iso-level lateral mixing |
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[9019] | 174 | DO jk = 1, jpkm1 |
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| 175 | DO jj = 2, jpjm1 |
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| 176 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 177 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,jk) + r_vvl * e3u_a(ji,jj,jk) ! after scale factor at T-point |
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| 178 | zzwi = - zdt * ( avm(ji+1,jj,jk ) + avm(ji,jj,jk ) ) / ( ze3ua * e3uw_n(ji,jj,jk ) ) * wumask(ji,jj,jk ) |
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| 179 | zzws = - zdt * ( avm(ji+1,jj,jk+1) + avm(ji,jj,jk+1) ) / ( ze3ua * e3uw_n(ji,jj,jk+1) ) * wumask(ji,jj,jk+1) |
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| 180 | zwi(ji,jj,jk) = zzwi |
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| 181 | zws(ji,jj,jk) = zzws |
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| 182 | zwd(ji,jj,jk) = 1._wp - zzwi - zzws |
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| 183 | END DO |
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| 184 | END DO |
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| 185 | END DO |
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[9490] | 186 | END SELECT |
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[9019] | 187 | ! |
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| 188 | DO jj = 2, jpjm1 !* Surface boundary conditions |
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| 189 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 190 | zwi(ji,jj,1) = 0._wp |
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| 191 | zwd(ji,jj,1) = 1._wp - zws(ji,jj,1) |
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| 192 | END DO |
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| 193 | END DO |
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| 194 | ! |
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| 195 | ! !== Apply semi-implicit bottom friction ==! |
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| 196 | ! |
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| 197 | ! Only needed for semi-implicit bottom friction setup. The explicit |
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| 198 | ! bottom friction has been included in "u(v)a" which act as the R.H.S |
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| 199 | ! column vector of the tri-diagonal matrix equation |
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| 200 | ! |
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| 201 | IF ( ln_drgimp ) THEN ! implicit bottom friction |
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| 202 | DO jj = 2, jpjm1 |
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| 203 | DO ji = 2, jpim1 |
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| 204 | iku = mbku(ji,jj) ! ocean bottom level at u- and v-points |
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| 205 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,iku) + r_vvl * e3u_a(ji,jj,iku) ! after scale factor at T-point |
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| 206 | zwd(ji,jj,iku) = zwd(ji,jj,iku) - r2dt * 0.5*( rCdU_bot(ji+1,jj)+rCdU_bot(ji,jj) ) / ze3ua |
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| 207 | END DO |
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| 208 | END DO |
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| 209 | IF ( ln_isfcav ) THEN ! top friction (always implicit) |
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| 210 | DO jj = 2, jpjm1 |
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| 211 | DO ji = 2, jpim1 |
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| 212 | !!gm top Cd is masked (=0 outside cavities) no need of test on mik>=2 ==>> it has been suppressed |
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| 213 | iku = miku(ji,jj) ! ocean top level at u- and v-points |
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| 214 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,iku) + r_vvl * e3u_a(ji,jj,iku) ! after scale factor at T-point |
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| 215 | zwd(ji,jj,iku) = zwd(ji,jj,iku) - r2dt * 0.5*( rCdU_top(ji+1,jj)+rCdU_top(ji,jj) ) / ze3ua |
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| 216 | END DO |
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| 217 | END DO |
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| 218 | END IF |
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| 219 | ENDIF |
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| 220 | ! |
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| 221 | ! Matrix inversion starting from the first level |
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| 222 | !----------------------------------------------------------------------- |
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| 223 | ! solve m.x = y where m is a tri diagonal matrix ( jpk*jpk ) |
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| 224 | ! |
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| 225 | ! ( zwd1 zws1 0 0 0 )( zwx1 ) ( zwy1 ) |
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| 226 | ! ( zwi2 zwd2 zws2 0 0 )( zwx2 ) ( zwy2 ) |
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| 227 | ! ( 0 zwi3 zwd3 zws3 0 )( zwx3 )=( zwy3 ) |
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| 228 | ! ( ... )( ... ) ( ... ) |
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| 229 | ! ( 0 0 0 zwik zwdk )( zwxk ) ( zwyk ) |
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| 230 | ! |
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| 231 | ! m is decomposed in the product of an upper and a lower triangular matrix |
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| 232 | ! The 3 diagonal terms are in 2d arrays: zwd, zws, zwi |
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| 233 | ! The solution (the after velocity) is in ua |
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| 234 | !----------------------------------------------------------------------- |
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| 235 | ! |
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| 236 | DO jk = 2, jpkm1 !== First recurrence : Dk = Dk - Lk * Uk-1 / Dk-1 (increasing k) == |
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| 237 | DO jj = 2, jpjm1 |
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| 238 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 239 | zwd(ji,jj,jk) = zwd(ji,jj,jk) - zwi(ji,jj,jk) * zws(ji,jj,jk-1) / zwd(ji,jj,jk-1) |
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| 240 | END DO |
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| 241 | END DO |
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| 242 | END DO |
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| 243 | ! |
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| 244 | DO jj = 2, jpjm1 !== second recurrence: SOLk = RHSk - Lk / Dk-1 Lk-1 ==! |
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| 245 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 246 | ze3ua = ( 1._wp - r_vvl ) * e3u_n(ji,jj,1) + r_vvl * e3u_a(ji,jj,1) |
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| 247 | ua(ji,jj,1) = ua(ji,jj,1) + r2dt * 0.5_wp * ( utau_b(ji,jj) + utau(ji,jj) ) & |
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| 248 | & / ( ze3ua * rau0 ) * umask(ji,jj,1) |
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| 249 | END DO |
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| 250 | END DO |
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| 251 | DO jk = 2, jpkm1 |
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| 252 | DO jj = 2, jpjm1 |
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| 253 | DO ji = fs_2, fs_jpim1 |
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| 254 | ua(ji,jj,jk) = ua(ji,jj,jk) - zwi(ji,jj,jk) / zwd(ji,jj,jk-1) * ua(ji,jj,jk-1) |
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| 255 | END DO |
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| 256 | END DO |
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| 257 | END DO |
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| 258 | ! |
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| 259 | DO jj = 2, jpjm1 !== thrid recurrence : SOLk = ( Lk - Uk * Ek+1 ) / Dk ==! |
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| 260 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 261 | ua(ji,jj,jpkm1) = ua(ji,jj,jpkm1) / zwd(ji,jj,jpkm1) |
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| 262 | END DO |
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| 263 | END DO |
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| 264 | DO jk = jpk-2, 1, -1 |
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| 265 | DO jj = 2, jpjm1 |
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| 266 | DO ji = fs_2, fs_jpim1 |
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| 267 | ua(ji,jj,jk) = ( ua(ji,jj,jk) - zws(ji,jj,jk) * ua(ji,jj,jk+1) ) / zwd(ji,jj,jk) |
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| 268 | END DO |
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| 269 | END DO |
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| 270 | END DO |
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| 271 | ! |
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| 272 | ! !== Vertical diffusion on v ==! |
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| 273 | ! |
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| 274 | ! !* Matrix construction |
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| 275 | zdt = r2dt * 0.5 |
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[9490] | 276 | SELECT CASE( nldf_dyn ) |
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| 277 | CASE( np_lap_i ) ! rotated lateral mixing: add its vertical mixing (akzu) |
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[9019] | 278 | DO jk = 1, jpkm1 |
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| 279 | DO jj = 2, jpjm1 |
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| 280 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 281 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,jk) + r_vvl * e3v_a(ji,jj,jk) ! after scale factor at T-point |
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[9490] | 282 | zzwi = - zdt * ( avm(ji,jj+1,jk ) + avm(ji,jj,jk ) + akzv(ji,jj,jk ) ) & |
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[9019] | 283 | & / ( ze3va * e3vw_n(ji,jj,jk ) ) * wvmask(ji,jj,jk ) |
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[9490] | 284 | zzws = - zdt * ( avm(ji,jj+1,jk+1) + avm(ji,jj,jk+1) + akzv(ji,jj,jk+1) ) & |
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[9019] | 285 | & / ( ze3va * e3vw_n(ji,jj,jk+1) ) * wvmask(ji,jj,jk+1) |
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| 286 | zwi(ji,jj,jk) = zzwi * wvmask(ji,jj,jk ) |
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| 287 | zws(ji,jj,jk) = zzws * wvmask(ji,jj,jk+1) |
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| 288 | zwd(ji,jj,jk) = 1._wp - zzwi - zzws |
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| 289 | END DO |
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| 290 | END DO |
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| 291 | END DO |
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[9490] | 292 | CASE DEFAULT ! iso-level lateral mixing |
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[9019] | 293 | DO jk = 1, jpkm1 |
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| 294 | DO jj = 2, jpjm1 |
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| 295 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 296 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,jk) + r_vvl * e3v_a(ji,jj,jk) ! after scale factor at T-point |
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[9490] | 297 | zzwi = - zdt * ( avm(ji,jj+1,jk ) + avm(ji,jj,jk ) ) / ( ze3va * e3vw_n(ji,jj,jk ) ) * wvmask(ji,jj,jk ) |
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| 298 | zzws = - zdt * ( avm(ji,jj+1,jk+1) + avm(ji,jj,jk+1) ) / ( ze3va * e3vw_n(ji,jj,jk+1) ) * wvmask(ji,jj,jk+1) |
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[9019] | 299 | zwi(ji,jj,jk) = zzwi * wvmask(ji,jj,jk ) |
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| 300 | zws(ji,jj,jk) = zzws * wvmask(ji,jj,jk+1) |
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| 301 | zwd(ji,jj,jk) = 1._wp - zzwi - zzws |
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| 302 | END DO |
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| 303 | END DO |
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| 304 | END DO |
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[9490] | 305 | END SELECT |
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[9019] | 306 | ! |
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| 307 | DO jj = 2, jpjm1 !* Surface boundary conditions |
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| 308 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 309 | zwi(ji,jj,1) = 0._wp |
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| 310 | zwd(ji,jj,1) = 1._wp - zws(ji,jj,1) |
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| 311 | END DO |
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| 312 | END DO |
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| 313 | ! !== Apply semi-implicit top/bottom friction ==! |
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| 314 | ! |
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| 315 | ! Only needed for semi-implicit bottom friction setup. The explicit |
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| 316 | ! bottom friction has been included in "u(v)a" which act as the R.H.S |
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| 317 | ! column vector of the tri-diagonal matrix equation |
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| 318 | ! |
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| 319 | IF( ln_drgimp ) THEN |
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| 320 | DO jj = 2, jpjm1 |
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| 321 | DO ji = 2, jpim1 |
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| 322 | ikv = mbkv(ji,jj) ! (deepest ocean u- and v-points) |
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| 323 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,ikv) + r_vvl * e3v_a(ji,jj,ikv) ! after scale factor at T-point |
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| 324 | zwd(ji,jj,ikv) = zwd(ji,jj,ikv) - r2dt * 0.5*( rCdU_bot(ji,jj+1)+rCdU_bot(ji,jj) ) / ze3va |
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| 325 | END DO |
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| 326 | END DO |
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| 327 | IF ( ln_isfcav ) THEN |
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| 328 | DO jj = 2, jpjm1 |
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| 329 | DO ji = 2, jpim1 |
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| 330 | ikv = mikv(ji,jj) ! (first wet ocean u- and v-points) |
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| 331 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,ikv) + r_vvl * e3v_a(ji,jj,ikv) ! after scale factor at T-point |
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| 332 | zwd(ji,jj,iku) = zwd(ji,jj,iku) - r2dt * 0.5*( rCdU_top(ji+1,jj)+rCdU_top(ji,jj) ) / ze3va |
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| 333 | END DO |
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| 334 | END DO |
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| 335 | ENDIF |
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| 336 | ENDIF |
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[456] | 337 | |
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[9019] | 338 | ! Matrix inversion |
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| 339 | !----------------------------------------------------------------------- |
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| 340 | ! solve m.x = y where m is a tri diagonal matrix ( jpk*jpk ) |
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[503] | 341 | ! |
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[9019] | 342 | ! ( zwd1 zws1 0 0 0 )( zwx1 ) ( zwy1 ) |
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| 343 | ! ( zwi2 zwd2 zws2 0 0 )( zwx2 ) ( zwy2 ) |
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| 344 | ! ( 0 zwi3 zwd3 zws3 0 )( zwx3 )=( zwy3 ) |
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| 345 | ! ( ... )( ... ) ( ... ) |
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| 346 | ! ( 0 0 0 zwik zwdk )( zwxk ) ( zwyk ) |
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[503] | 347 | ! |
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[9019] | 348 | ! m is decomposed in the product of an upper and lower triangular matrix |
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| 349 | ! The 3 diagonal terms are in 2d arrays: zwd, zws, zwi |
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| 350 | ! The solution (after velocity) is in 2d array va |
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| 351 | !----------------------------------------------------------------------- |
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| 352 | ! |
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| 353 | DO jk = 2, jpkm1 !== First recurrence : Dk = Dk - Lk * Uk-1 / Dk-1 (increasing k) == |
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| 354 | DO jj = 2, jpjm1 |
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| 355 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 356 | zwd(ji,jj,jk) = zwd(ji,jj,jk) - zwi(ji,jj,jk) * zws(ji,jj,jk-1) / zwd(ji,jj,jk-1) |
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| 357 | END DO |
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| 358 | END DO |
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| 359 | END DO |
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| 360 | ! |
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| 361 | DO jj = 2, jpjm1 !== second recurrence: SOLk = RHSk - Lk / Dk-1 Lk-1 ==! |
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| 362 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 363 | ze3va = ( 1._wp - r_vvl ) * e3v_n(ji,jj,1) + r_vvl * e3v_a(ji,jj,1) |
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| 364 | va(ji,jj,1) = va(ji,jj,1) + r2dt * 0.5_wp * ( vtau_b(ji,jj) + vtau(ji,jj) ) & |
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| 365 | & / ( ze3va * rau0 ) * vmask(ji,jj,1) |
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| 366 | END DO |
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| 367 | END DO |
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| 368 | DO jk = 2, jpkm1 |
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| 369 | DO jj = 2, jpjm1 |
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| 370 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 371 | va(ji,jj,jk) = va(ji,jj,jk) - zwi(ji,jj,jk) / zwd(ji,jj,jk-1) * va(ji,jj,jk-1) |
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| 372 | END DO |
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| 373 | END DO |
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| 374 | END DO |
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| 375 | ! |
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| 376 | DO jj = 2, jpjm1 !== third recurrence : SOLk = ( Lk - Uk * SOLk+1 ) / Dk ==! |
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| 377 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 378 | va(ji,jj,jpkm1) = va(ji,jj,jpkm1) / zwd(ji,jj,jpkm1) |
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| 379 | END DO |
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| 380 | END DO |
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| 381 | DO jk = jpk-2, 1, -1 |
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| 382 | DO jj = 2, jpjm1 |
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| 383 | DO ji = fs_2, fs_jpim1 |
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| 384 | va(ji,jj,jk) = ( va(ji,jj,jk) - zws(ji,jj,jk) * va(ji,jj,jk+1) ) / zwd(ji,jj,jk) |
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| 385 | END DO |
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| 386 | END DO |
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| 387 | END DO |
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| 388 | ! |
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[503] | 389 | IF( l_trddyn ) THEN ! save the vertical diffusive trends for further diagnostics |
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[7753] | 390 | ztrdu(:,:,:) = ( ua(:,:,:) - ub(:,:,:) ) / r2dt - ztrdu(:,:,:) |
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| 391 | ztrdv(:,:,:) = ( va(:,:,:) - vb(:,:,:) ) / r2dt - ztrdv(:,:,:) |
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[4990] | 392 | CALL trd_dyn( ztrdu, ztrdv, jpdyn_zdf, kt ) |
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[9019] | 393 | DEALLOCATE( ztrdu, ztrdv ) |
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[456] | 394 | ENDIF |
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| 395 | ! ! print mean trends (used for debugging) |
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| 396 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' zdf - Ua: ', mask1=umask, & |
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[5836] | 397 | & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) |
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| 398 | ! |
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[9019] | 399 | IF( ln_timing ) CALL timing_stop('dyn_zdf') |
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[503] | 400 | ! |
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[456] | 401 | END SUBROUTINE dyn_zdf |
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| 402 | |
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| 403 | !!============================================================================== |
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| 404 | END MODULE dynzdf |
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