[3] | 1 | MODULE zdfevd |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfevd *** |
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| 4 | !! Ocean physics: parameterization of convection through an enhancement |
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| 5 | !! of vertical eddy mixing coefficient |
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| 6 | !!====================================================================== |
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| 7 | |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | !! zdf_evd : update momentum and tracer Kz at the location of |
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| 10 | !! statically unstable portion of the water column |
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| 11 | !! (called if ln_zdfevd=T) |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! * Modules used |
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| 14 | USE oce ! ocean dynamics and tracers variables |
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| 15 | USE dom_oce ! ocean space and time domain variables |
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| 16 | USE zdf_oce ! ocean vertical physics variables |
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[255] | 17 | USE zdfkpp ! KPP vertical mixing |
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[3] | 18 | USE in_out_manager ! I/O manager |
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| 19 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 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 zdf_evd ! called by step.F90 |
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| 26 | |
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[255] | 27 | !! * Substitutions |
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| 28 | # include "domzgr_substitute.h90" |
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[3] | 29 | !!---------------------------------------------------------------------- |
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[247] | 30 | !! OPA 9.0 , LOCEAN-IPSL (2005) |
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[719] | 31 | !! $Header$ |
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[247] | 32 | !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt |
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[3] | 33 | !!---------------------------------------------------------------------- |
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| 34 | |
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| 35 | CONTAINS |
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| 36 | |
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| 37 | SUBROUTINE zdf_evd( kt ) |
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| 38 | !!---------------------------------------------------------------------- |
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| 39 | !! *** ROUTINE zdf_evd *** |
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| 40 | !! |
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| 41 | !! ** Purpose : Local increased the vertical eddy viscosity and diffu- |
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| 42 | !! sivity coefficients when a static instability is encountered. |
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| 43 | !! |
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| 44 | !! ** Method : avt, and the 4 neighbouring avmu, avmv coefficients |
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| 45 | !! are set to avevd (namelist parameter) if the water column is |
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| 46 | !! statically unstable (i.e. if rn2 < -1.e-12 ) |
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| 47 | !! |
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| 48 | !! ** Action : Update avt, avmu, avmv in statically instable cases |
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[255] | 49 | !! and avt_evd which is avt due to convection |
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[3] | 50 | !! References : |
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| 51 | !! Lazar, A., these de l'universite Paris VI, France, 1997 |
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| 52 | !! History : |
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| 53 | !! 7.0 ! 97-06 (G. Madec, A. Lazar) Original code |
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| 54 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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[255] | 55 | !! 9.0 ! 05-06 (C. Ethe) KPP parameterization |
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[3] | 56 | !!---------------------------------------------------------------------- |
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| 57 | !! * Arguments |
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| 58 | INTEGER, INTENT( in ) :: kt ! ocean time-step indexocean time step |
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| 59 | |
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| 60 | !! * Local declarations |
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| 61 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 62 | !!---------------------------------------------------------------------- |
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| 63 | |
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| 64 | IF( kt == nit000 ) THEN |
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| 65 | IF(lwp) WRITE(numout,*) |
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| 66 | IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)' |
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| 67 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 68 | IF(lwp) WRITE(numout,*) |
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| 69 | ENDIF |
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| 70 | |
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[255] | 71 | ! Initialisation of avt_evd (vertical diffusion due to convection) to avt and avmu_evd to avmu |
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| 72 | avt_evd (:,:,:) = avt(:,:,:) |
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| 73 | avmu_evd (:,:,:) = avmu(:,:,:) |
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| 74 | |
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[463] | 75 | SELECT CASE ( n_evdm ) |
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[3] | 76 | |
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| 77 | CASE ( 1 ) ! enhance vertical eddy viscosity and diffusivity (if rn2<-1.e-12) |
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| 78 | ! ! =============== |
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| 79 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 80 | ! ! =============== |
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[789] | 81 | # if defined key_vectopt_loop |
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[3] | 82 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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| 83 | jj = 1 ! big loop forced |
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[96] | 84 | DO ji = jpi+2, jpij |
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[255] | 85 | # if defined key_zdfkpp |
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| 86 | !! no implicit mixing in the boundary layer with KPP |
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| 87 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) THEN |
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| 88 | # else |
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[3] | 89 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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[255] | 90 | # endif |
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[3] | 91 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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| 92 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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| 93 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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| 94 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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| 95 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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| 96 | ENDIF |
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| 97 | END DO |
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| 98 | # else |
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| 99 | DO jj = 2, jpj ! no vector opt. |
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| 100 | DO ji = 2, jpi |
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[255] | 101 | # if defined key_zdfkpp |
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| 102 | !! no implicit mixing in the boundary layer with KPP |
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| 103 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) THEN |
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| 104 | # else |
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| 105 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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| 106 | # endif |
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[3] | 107 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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| 108 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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| 109 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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| 110 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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| 111 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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| 112 | ENDIF |
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| 113 | END DO |
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| 114 | END DO |
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| 115 | # endif |
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| 116 | ! ! =============== |
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| 117 | END DO ! End of slab |
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| 118 | ! ! =============== |
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| 119 | |
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| 120 | ! Lateral boundary conditions on ( avt, avmu, avmv ) (unchanged sign) |
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| 121 | ! -------------------------------=================== |
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| 122 | CALL lbc_lnk( avt , 'W', 1. ) |
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| 123 | CALL lbc_lnk( avmu, 'U', 1. ) |
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| 124 | CALL lbc_lnk( avmv, 'V', 1. ) |
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| 125 | |
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| 126 | CASE DEFAULT ! enhance vertical eddy diffusivity only (if rn2<-1.e-12) |
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| 127 | ! ! =============== |
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| 128 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 129 | ! ! =============== |
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| 130 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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[789] | 131 | # if defined key_vectopt_loop |
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[3] | 132 | jj = 1 ! big loop forced |
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| 133 | DO ji = 1, jpij |
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[255] | 134 | # if defined key_zdfkpp |
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| 135 | !! no implicit mixing in the boundary layer with KPP |
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| 136 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) & |
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| 137 | avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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| 138 | # else |
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[3] | 139 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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[255] | 140 | # endif |
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[3] | 141 | END DO |
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| 142 | # else |
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| 143 | DO jj = 1, jpj ! loop over the whole domain (no lbc_lnk call) |
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| 144 | DO ji = 1, jpi |
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[255] | 145 | # if defined key_zdfkpp |
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| 146 | !! no implicit mixing in the boundary layer with KPP |
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| 147 | IF( ( rn2(ji,jj,jk) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) & |
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| 148 | avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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| 149 | # else |
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[3] | 150 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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[255] | 151 | # endif |
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[3] | 152 | END DO |
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| 153 | END DO |
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| 154 | # endif |
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| 155 | ! ! =============== |
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| 156 | END DO ! End of slab |
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| 157 | ! ! =============== |
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| 158 | END SELECT |
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| 159 | |
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[255] | 160 | ! update of avt_evd and avmu_evd |
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| 161 | avt_evd (:,:,:) = avt (:,:,:) - avt_evd (:,:,:) |
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| 162 | avmu_evd (:,:,:) = avmu(:,:,:) - avmu_evd (:,:,:) |
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| 163 | |
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[3] | 164 | END SUBROUTINE zdf_evd |
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| 165 | |
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| 166 | !!====================================================================== |
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| 167 | END MODULE zdfevd |
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