| 1 | MODULE zdfsh2 |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfsh2 *** |
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| 4 | !! Ocean physics: shear production term of TKE |
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| 5 | !!===================================================================== |
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| 6 | !! History : - ! 2014-10 (A. Barthelemy, G. Madec) original code |
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| 7 | !! NEMO 4.0 ! 2017-04 (G. Madec) remove u-,v-pts avm |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! zdf_sh2 : compute mixing the shear production term of TKE |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | USE oce ! ocean: shared variables |
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| 14 | USE dom_oce ! domain: ocean |
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| 15 | USE zdf_oce ! vertical physics: variables |
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| 16 | ! |
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| 17 | USE in_out_manager ! I/O manager |
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| 18 | USE lib_mpp ! MPP library |
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| 19 | USE timing ! Timing |
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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 | PUBLIC zdf_sh2 ! called by zdftke, zdfglf, and zdfric |
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| 25 | |
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| 26 | !!---------------------------------------------------------------------- |
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| 27 | !! NEMO/OPA 4.0 , NEMO Consortium (2017) |
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| 28 | !! $Id: $ |
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| 29 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 30 | !!---------------------------------------------------------------------- |
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| 31 | CONTAINS |
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| 32 | |
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| 33 | SUBROUTINE zdf_sh2( psh2 ) |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | !! *** ROUTINE zdf_sh2 *** |
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| 36 | !! |
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| 37 | !! ** Purpose : Compute the shear production term of a TKE equation |
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| 38 | !! |
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| 39 | !! ** Method : - a stable discretization of this term is linked to the |
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| 40 | !! time-space discretization of the vertical diffusion |
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| 41 | !! of the OGCM. NEMO uses C-grid, a leap-frog environment |
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| 42 | !! and an implicit computation of vertical mixing term, |
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| 43 | !! so the shear production at w-point is given by: |
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| 44 | !! sh2 = mi[ mi(avm) * dk[ub]/e3ub * dk[un]/e3un ] |
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| 45 | !! + mj[ mj(avm) * dk[vb]/e3vb * dk[vn]/e3vn ] |
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| 46 | !! NB: wet-point only horizontal averaging of shear |
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| 47 | !! |
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| 48 | !! ** Action : - psh2 shear prod. term at w-point (interior ocean domain only) |
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| 49 | !! |
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| 50 | !! References : Bruchard, OM 2002 |
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| 51 | !! --------------------------------------------------------------------- |
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| 52 | REAL(wp), DIMENSION(jpi,jpj,jpk), INTENT( out) :: psh2 ! shear production of TKE (w-points) |
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| 53 | ! |
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| 54 | INTEGER :: ji, jj, jk ! dummy loop arguments |
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| 55 | REAL(wp), DIMENSION(jpi,jpj) :: zsh2u, zsh2v ! 2D workspace |
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| 56 | !!-------------------------------------------------------------------- |
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| 57 | IF( nn_timing == 1 ) CALL timing_start('zdf_sh2') |
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| 58 | ! |
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| 59 | DO jk = 2, jpkm1 |
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| 60 | DO jj = 1, jpjm1 !* Shear production at uw- and vw-points (energy conserving form) |
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| 61 | DO ji = 1, jpim1 |
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| 62 | zsh2u(ji,jj) = 0.5 * ( avm(ji+1,jj,jk) + avm(ji,jj,jk) ) * wumask(ji,jj,jk) & |
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| 63 | & * ( un(ji,jj,jk-1) - un(ji,jj,jk) ) & |
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| 64 | & * ( ub(ji,jj,jk-1) - ub(ji,jj,jk) ) / ( e3uw_n(ji,jj,jk) * e3uw_b(ji,jj,jk) ) |
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| 65 | zsh2v(ji,jj) = 0.5 * ( avm(ji,jj+1,jk) + avm(ji,jj,jk) ) * wvmask(ji,jj,jk) & |
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| 66 | & * ( vn(ji,jj,jk-1) - vn(ji,jj,jk) ) & |
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| 67 | & * ( vb(ji,jj,jk-1) - vb(ji,jj,jk) ) / ( e3vw_n(ji,jj,jk) * e3vw_b(ji,jj,jk) ) |
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| 68 | END DO |
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| 69 | END DO |
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| 70 | DO jj = 2, jpjm1 !* shear production at w-point |
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| 71 | DO ji = 2, jpim1 |
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| 72 | ! |
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| 73 | !!gm original type of coding |
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| 74 | ! psh2(ji,jj,jk) = ( zsh2u(ji-1,jj) + zsh2u(ji,jj) ) / MAX( 1._wp , umask(ji-1,jj,jk)+umask(ji,jj,jk) ) & |
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| 75 | ! & + ( zsh2v(ji,jj-1) + zsh2v(ji,jj) ) / MAX( 1._wp , vmask(ji,jj-1,jk)+vmask(ji,jj,jk) ) |
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| 76 | ! |
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| 77 | !!gm optimized but it changes the last digits after 1 year of GYRE |
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| 78 | ! ! coast mask: =1 at the coast ; =2 otherwise |
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| 79 | ! ! no need of wmask as zsh2 are already masked |
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| 80 | psh2(ji,jj,jk) = ( zsh2u(ji-1,jj) + zsh2u(ji,jj) ) * ( 2._wp - umask(ji-1,jj,jk) * umask(ji,jj,jk) ) & |
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| 81 | & + ( zsh2v(ji,jj-1) + zsh2v(ji,jj) ) * ( 2._wp - vmask(ji,jj-1,jk) * vmask(ji,jj,jk) ) |
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| 82 | END DO |
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| 83 | END DO |
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| 84 | END DO |
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| 85 | ! |
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| 86 | IF( nn_timing == 1 ) CALL timing_stop('zdf_sh2') |
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| 87 | ! |
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| 88 | END SUBROUTINE zdf_sh2 |
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| 89 | |
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| 90 | !!====================================================================== |
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| 91 | END MODULE zdfsh2 |
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