[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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| 17 | USE in_out_manager ! I/O manager |
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| 18 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 19 | |
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| 20 | IMPLICIT NONE |
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| 21 | PRIVATE |
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| 22 | |
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| 23 | !! * Routine accessibility |
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| 24 | PUBLIC zdf_evd ! called by step.F90 |
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| 25 | |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | !! OPA 9.0 , LODYC-IPSL (2003) |
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| 28 | !!---------------------------------------------------------------------- |
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| 29 | |
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| 30 | CONTAINS |
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| 31 | |
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| 32 | SUBROUTINE zdf_evd( kt ) |
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| 33 | !!---------------------------------------------------------------------- |
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| 34 | !! *** ROUTINE zdf_evd *** |
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| 35 | !! |
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| 36 | !! ** Purpose : Local increased the vertical eddy viscosity and diffu- |
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| 37 | !! sivity coefficients when a static instability is encountered. |
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| 38 | !! |
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| 39 | !! ** Method : avt, and the 4 neighbouring avmu, avmv coefficients |
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| 40 | !! are set to avevd (namelist parameter) if the water column is |
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| 41 | !! statically unstable (i.e. if rn2 < -1.e-12 ) |
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| 42 | !! |
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| 43 | !! ** Action : Update avt, avmu, avmv in statically instable cases |
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| 44 | !! |
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| 45 | !! References : |
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| 46 | !! Lazar, A., these de l'universite Paris VI, France, 1997 |
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| 47 | !! History : |
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| 48 | !! 7.0 ! 97-06 (G. Madec, A. Lazar) Original code |
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| 49 | !! 8.5 ! 02-06 (G. Madec) F90: Free form and module |
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| 50 | !!---------------------------------------------------------------------- |
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| 51 | !! * Arguments |
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| 52 | INTEGER, INTENT( in ) :: kt ! ocean time-step indexocean time step |
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| 53 | |
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| 54 | !! * Local declarations |
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| 55 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 56 | !!---------------------------------------------------------------------- |
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| 57 | |
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| 58 | IF( kt == nit000 ) THEN |
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| 59 | IF(lwp) WRITE(numout,*) |
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| 60 | IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)' |
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| 61 | IF(lwp) WRITE(numout,*) '~~~~~~~ ' |
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| 62 | IF(lwp) WRITE(numout,*) |
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| 63 | ENDIF |
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| 64 | |
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| 65 | SELECT CASE ( nevdm ) |
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| 66 | |
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| 67 | CASE ( 1 ) ! enhance vertical eddy viscosity and diffusivity (if rn2<-1.e-12) |
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| 68 | ! ! =============== |
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| 69 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 70 | ! ! =============== |
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| 71 | # if defined key_vectopt_loop && ! defined key_autotasking |
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| 72 | !!! WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd ! agissant sur T SEUL! |
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| 73 | jj = 1 ! big loop forced |
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[96] | 74 | DO ji = jpi+2, jpij |
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[3] | 75 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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| 76 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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| 77 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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| 78 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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| 79 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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| 80 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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| 81 | ENDIF |
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| 82 | END DO |
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| 83 | # else |
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| 84 | DO jj = 2, jpj ! no vector opt. |
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| 85 | DO ji = 2, jpi |
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| 86 | IF( rn2(ji,jj,jk) <= -1.e-12 ) THEN |
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| 87 | avt (ji ,jj ,jk) = avevd * tmask(ji ,jj ,jk) |
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| 88 | avmu(ji ,jj ,jk) = avevd * umask(ji ,jj ,jk) |
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| 89 | avmu(ji-1,jj ,jk) = avevd * umask(ji-1,jj ,jk) |
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| 90 | avmv(ji ,jj ,jk) = avevd * vmask(ji ,jj ,jk) |
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| 91 | avmv(ji ,jj-1,jk) = avevd * vmask(ji ,jj-1,jk) |
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| 92 | ENDIF |
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| 93 | END DO |
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| 94 | END DO |
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| 95 | # endif |
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| 96 | ! ! =============== |
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| 97 | END DO ! End of slab |
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| 98 | ! ! =============== |
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| 99 | |
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| 100 | ! Lateral boundary conditions on ( avt, avmu, avmv ) (unchanged sign) |
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| 101 | ! -------------------------------=================== |
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| 102 | CALL lbc_lnk( avt , 'W', 1. ) |
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| 103 | CALL lbc_lnk( avmu, 'U', 1. ) |
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| 104 | CALL lbc_lnk( avmv, 'V', 1. ) |
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| 105 | |
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| 106 | CASE DEFAULT ! enhance vertical eddy diffusivity only (if rn2<-1.e-12) |
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| 107 | ! ! =============== |
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| 108 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 109 | ! ! =============== |
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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 && ! defined key_autotasking |
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| 112 | jj = 1 ! big loop forced |
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| 113 | DO ji = 1, jpij |
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| 114 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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| 115 | END DO |
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| 116 | # else |
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| 117 | DO jj = 1, jpj ! loop over the whole domain (no lbc_lnk call) |
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| 118 | DO ji = 1, jpi |
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| 119 | IF( rn2(ji,jj,jk) <= -1.e-12 ) avt(ji,jj,jk) = avevd * tmask(ji,jj,jk) |
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| 120 | END DO |
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| 121 | END DO |
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| 122 | # endif |
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| 123 | ! ! =============== |
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| 124 | END DO ! End of slab |
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| 125 | ! ! =============== |
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| 126 | END SELECT |
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| 127 | |
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| 128 | END SUBROUTINE zdf_evd |
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| 129 | |
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| 130 | !!====================================================================== |
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| 131 | END MODULE zdfevd |
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