| 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 | !! History : OPA ! 1997-06 (G. Madec, A. Lazar) Original code |
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| 8 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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| 9 | !! - ! 2005-06 (C. Ethe) KPP parameterization |
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| 10 | !! 3.2 ! 2009-03 (M. Leclair, G. Madec, R. Benshila) test on both before & after |
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| 11 | !!---------------------------------------------------------------------- |
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| 12 | |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | !! zdf_evd : increase the momentum and tracer Kz at the location of |
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| 15 | !! statically unstable portion of the water column (ln_zdfevd=T) |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | USE oce ! ocean dynamics and tracers variables |
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| 18 | USE dom_oce ! ocean space and time domain variables |
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| 19 | USE zdf_oce ! ocean vertical physics variables |
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| 20 | USE zdfkpp ! KPP vertical mixing |
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| 21 | USE in_out_manager ! I/O manager |
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| 22 | USE iom ! for iom_put |
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| 23 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 24 | |
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| 25 | IMPLICIT NONE |
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| 26 | PRIVATE |
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| 27 | |
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| 28 | PUBLIC zdf_evd ! called by step.F90 |
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| 29 | |
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| 30 | !! * Substitutions |
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| 31 | # include "domzgr_substitute.h90" |
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| 32 | !!---------------------------------------------------------------------- |
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| 33 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 34 | !! $Id$ |
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| 35 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 36 | !!---------------------------------------------------------------------- |
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| 37 | |
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| 38 | CONTAINS |
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| 39 | |
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| 40 | SUBROUTINE zdf_evd( kt ) |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! *** ROUTINE zdf_evd *** |
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| 43 | !! |
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| 44 | !! ** Purpose : Local increased the vertical eddy viscosity and diffu- |
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| 45 | !! sivity coefficients when a static instability is encountered. |
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| 46 | !! |
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| 47 | !! ** Method : avt, avm, and the 4 neighbouring avmu, avmv coefficients |
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| 48 | !! are set to avevd (namelist parameter) if the water column is |
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| 49 | !! statically unstable (i.e. if rn2 < -1.e-12 ) |
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| 50 | !! |
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| 51 | !! ** Action : avt, avm, avmu, avmv updted in static instability cases |
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| 52 | !! |
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| 53 | !! References : Lazar, A., these de l'universite Paris VI, France, 1997 |
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| 54 | !!---------------------------------------------------------------------- |
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| 55 | USE oce, zavt_evd => ua ! use ua as workspace |
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| 56 | USE oce, zavm_evd => va ! use va as workspace |
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| 57 | !! |
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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 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 61 | !!---------------------------------------------------------------------- |
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| 62 | |
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| 63 | IF( kt == nit000 ) THEN |
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| 64 | IF(lwp) WRITE(numout,*) |
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| 65 | IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)' |
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| 66 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 67 | IF(lwp) WRITE(numout,*) |
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| 68 | ENDIF |
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| 69 | |
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| 70 | zavt_evd(:,:,:) = avt(:,:,:) ! set avt prior to evd application |
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| 71 | |
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| 72 | SELECT CASE ( nn_evdm ) |
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| 73 | |
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| 74 | CASE ( 1 ) ! enhance vertical eddy viscosity and diffusivity (if rn2<-1.e-12) |
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| 75 | |
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| 76 | zavm_evd(:,:,:) = avm(:,:,:) ! set avm prior to evd application |
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| 77 | ! |
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| 78 | DO jk = 1, jpkm1 |
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| 79 | #if defined key_vectopt_loop |
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| 80 | DO jj = 1, 1 ! big loop forced |
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| 81 | DO ji = jpi+2, jpij |
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| 82 | #else |
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| 83 | DO jj = 2, jpj ! no vector opt. |
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| 84 | DO ji = 2, jpi |
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| 85 | #endif |
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| 86 | #if defined key_zdfkpp |
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| 87 | ! no evd mixing in the boundary layer with KPP |
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| 88 | IF( ( MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) THEN |
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| 89 | #else |
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| 90 | IF( MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) THEN |
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| 91 | #endif |
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| 92 | avt (ji ,jj ,jk) = rn_avevd * tmask(ji ,jj ,jk) |
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| 93 | avm (ji ,jj ,jk) = rn_avevd * tmask(ji ,jj ,jk) |
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| 94 | avmu(ji ,jj ,jk) = rn_avevd * umask(ji ,jj ,jk) |
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| 95 | avmu(ji-1,jj ,jk) = rn_avevd * umask(ji-1,jj ,jk) |
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| 96 | avmv(ji ,jj ,jk) = rn_avevd * vmask(ji ,jj ,jk) |
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| 97 | avmv(ji ,jj-1,jk) = rn_avevd * vmask(ji ,jj-1,jk) |
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| 98 | ENDIF |
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| 99 | END DO |
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| 100 | END DO |
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| 101 | END DO |
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| 102 | CALL lbc_lnk( avt , 'W', 1. ) ; CALL lbc_lnk( avm , 'W', 1. ) ! Lateral boundary conditions (unchanged sign) |
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| 103 | CALL lbc_lnk( avmu, 'U', 1. ) ; CALL lbc_lnk( avmv, 'V', 1. ) |
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| 104 | ! |
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| 105 | zavm_evd(:,:,:) = avm(:,:,:) - zavm_evd(:,:,:) ! change in avm due to evd |
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| 106 | CALL iom_put( "avm_evd", zavm_evd ) ! output this change |
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| 107 | ! |
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| 108 | CASE DEFAULT ! enhance vertical eddy diffusivity only (if rn2<-1.e-12) |
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| 109 | DO jk = 1, jpkm1 |
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| 110 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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| 111 | #if defined key_vectopt_loop |
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| 112 | DO jj = 1, 1 ! big loop forced |
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| 113 | DO ji = 1, jpij |
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| 114 | #else |
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| 115 | DO jj = 1, jpj ! loop over the whole domain (no lbc_lnk call) |
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| 116 | DO ji = 1, jpi |
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| 117 | #endif |
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| 118 | #if defined key_zdfkpp |
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| 119 | ! no evd mixing in the boundary layer with KPP |
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| 120 | IF( ( MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) .AND. ( fsdepw(ji,jj,jk) > hkpp(ji,jj) ) ) & |
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| 121 | #else |
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| 122 | IF( MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) & |
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| 123 | #endif |
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| 124 | avt(ji,jj,jk) = rn_avevd * tmask(ji,jj,jk) |
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| 125 | END DO |
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| 126 | END DO |
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| 127 | END DO |
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| 128 | ! |
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| 129 | END SELECT |
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| 130 | |
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| 131 | zavt_evd(:,:,:) = avt(:,:,:) - zavt_evd(:,:,:) ! change in avt due to evd |
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| 132 | CALL iom_put( "avt_evd", zavt_evd ) ! output this change |
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| 133 | ! |
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| 134 | END SUBROUTINE zdf_evd |
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| 135 | |
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| 136 | !!====================================================================== |
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| 137 | END MODULE zdfevd |
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