[1878] | 1 | MODULE traadv_ubs |
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| 2 | !!============================================================================== |
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| 3 | !! *** MODULE traadv_ubs *** |
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| 4 | !! Ocean active tracers: horizontal & vertical advective trend |
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| 5 | !!============================================================================== |
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| 6 | !! History : 9.0 ! 06-08 (L. Debreu, R. Benshila) Original code |
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| 7 | !!---------------------------------------------------------------------- |
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| 8 | |
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| 9 | !!---------------------------------------------------------------------- |
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| 10 | !! tra_adv_ubs : update the tracer trend with the horizontal |
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| 11 | !! advection trends using a third order biaised scheme |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | USE oce ! ocean dynamics and active tracers |
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| 14 | USE dom_oce ! ocean space and time domain |
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| 15 | USE trdmod |
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| 16 | USE trdmod_oce |
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| 17 | USE lib_mpp |
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| 18 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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| 19 | USE in_out_manager ! I/O manager |
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| 20 | USE diaptr ! poleward transport diagnostics |
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| 21 | USE dynspg_oce ! choice/control of key cpp for surface pressure gradient |
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| 22 | USE prtctl |
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| 23 | |
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| 24 | IMPLICIT NONE |
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| 25 | PRIVATE |
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| 26 | |
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| 27 | PUBLIC tra_adv_ubs ! routine called by traadv module |
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| 28 | |
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| 29 | REAL(wp), DIMENSION(jpi,jpj) :: e1e2tr ! = 1/(e1t * e2t) |
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| 30 | |
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| 31 | !! * Substitutions |
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| 32 | # include "domzgr_substitute.h90" |
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| 33 | # include "vectopt_loop_substitute.h90" |
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| 34 | !!---------------------------------------------------------------------- |
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| 35 | !! OPA 9.0 , LOCEAN-IPSL (2006) |
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| 36 | !! $Id: traadv_ubs.F90 1528 2009-07-23 14:38:47Z rblod $ |
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| 37 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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| 38 | !!---------------------------------------------------------------------- |
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| 39 | |
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| 40 | CONTAINS |
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| 41 | |
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| 42 | SUBROUTINE tra_adv_ubs( kt, pun, pvn, pwn ) |
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| 43 | !!---------------------------------------------------------------------- |
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| 44 | !! *** ROUTINE tra_adv_ubs *** |
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| 45 | !! |
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| 46 | !! ** Purpose : Compute the now trend due to the advection of tracers |
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| 47 | !! and add it to the general trend of passive tracer equations. |
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| 48 | !! |
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| 49 | !! ** Method : The upstream biased third (UBS) is order scheme based |
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| 50 | !! on an upstream-biased parabolic interpolation (Shchepetkin and McWilliams 2005) |
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| 51 | !! It is only used in the horizontal direction. |
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| 52 | !! For example the i-component of the advective fluxes are given by : |
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| 53 | !! ! e1u e3u un ( mi(Tn) - zltu(i ) ) if un(i) >= 0 |
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| 54 | !! zwx = ! or |
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| 55 | !! ! e1u e3u un ( mi(Tn) - zltu(i+1) ) if un(i) < 0 |
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| 56 | !! where zltu is the second derivative of the before temperature field: |
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| 57 | !! zltu = 1/e3t di[ e2u e3u / e1u di[Tb] ] |
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| 58 | !! This results in a dissipatively dominant (i.e. hyper-diffusive) |
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| 59 | !! truncation error. The overall performance of the advection scheme |
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| 60 | !! is similar to that reported in (Farrow and Stevens, 1995). |
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| 61 | !! For stability reasons, the first term of the fluxes which corresponds |
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| 62 | !! to a second order centered scheme is evaluated using the now velocity |
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| 63 | !! (centered in time) while the second term which is the diffusive part |
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| 64 | !! of the scheme, is evaluated using the before velocity (forward in time). |
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| 65 | !! Note that UBS is not positive. Do not use it on passive tracers. |
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| 66 | !! On the vertical, the advection is evaluated using a TVD scheme, as |
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| 67 | !! the UBS have been found to be too diffusive. |
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| 68 | !! |
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| 69 | !! ** Action : - update (ta,sa) with the now advective tracer trends |
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| 70 | !! |
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| 71 | !! Reference : Shchepetkin, A. F., J. C. McWilliams, 2005, Ocean Modelling, 9, 347-404. |
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| 72 | !! Farrow, D.E., Stevens, D.P., 1995, J. Phys. Ocean. 25, 1731Ð1741. |
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| 73 | !!---------------------------------------------------------------------- |
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| 74 | USE oce, ONLY : zwx => ua ! use ua as workspace |
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| 75 | USE oce, ONLY : zwy => va ! use va as workspace |
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| 76 | !! |
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| 77 | INTEGER , INTENT(in) :: kt ! ocean time-step index |
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| 78 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj,jpk) :: pun ! effective ocean velocity, u_component |
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| 79 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj,jpk) :: pvn ! effective ocean velocity, v_component |
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| 80 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj,jpk) :: pwn ! effective ocean velocity, w_component |
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| 81 | !! |
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| 82 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 83 | REAL(wp) :: zta, zsa, zbtr, zcoef ! temporary scalars |
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| 84 | REAL(wp) :: zfui, zfp_ui, zfm_ui, zcenut, zcenus ! " " |
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| 85 | REAL(wp) :: zfvj, zfp_vj, zfm_vj, zcenvt, zcenvs ! " " |
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| 86 | REAL(wp) :: z_hdivn_x, z_hdivn_y, z_hdivn ! " " |
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| 87 | REAL(wp), DIMENSION(jpi,jpj) :: zeeu, zeev ! temporary 2D workspace |
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| 88 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zwz , zww ! temporary 3D workspace |
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| 89 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztu , ztv , zltu , zltv, ztrdt ! " " |
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| 90 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zsu , zsv , zlsu , zlsv, ztrds ! " " |
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| 91 | !!---------------------------------------------------------------------- |
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| 92 | |
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| 93 | zltu(:,:,:) = 0.e0 |
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| 94 | zltv(:,:,:) = 0.e0 |
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| 95 | zlsu(:,:,:) = 0.e0 |
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| 96 | zlsv(:,:,:) = 0.e0 |
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| 97 | |
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| 98 | IF( kt == nit000 ) THEN |
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| 99 | IF(lwp) WRITE(numout,*) |
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| 100 | IF(lwp) WRITE(numout,*) 'tra_adv_ubs : horizontal UBS advection scheme' |
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| 101 | IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~' |
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| 102 | ! |
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| 103 | e1e2tr(:,:) = 1. / ( e1t(:,:) * e2t(:,:) ) |
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| 104 | ENDIF |
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| 105 | |
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| 106 | ! Save ta and sa trends |
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| 107 | ztrdt(:,:,:) = ta(:,:,:) |
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| 108 | ztrds(:,:,:) = sa(:,:,:) |
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| 109 | |
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| 110 | zcoef = 1./6. |
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| 111 | ! ! =============== |
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| 112 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 113 | ! ! =============== |
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| 114 | |
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| 115 | ! Initialization of metric arrays (for z- or s-coordinates) |
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| 116 | DO jj = 1, jpjm1 |
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| 117 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 118 | #if defined key_zco |
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| 119 | ! z-coordinates, no vertical scale factors |
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| 120 | zeeu(ji,jj) = e2u(ji,jj) / e1u(ji,jj) * umask(ji,jj,jk) |
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| 121 | zeev(ji,jj) = e1v(ji,jj) / e2v(ji,jj) * vmask(ji,jj,jk) |
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| 122 | #else |
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| 123 | ! s-coordinates, vertical scale factor are used |
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| 124 | zeeu(ji,jj) = e2u(ji,jj) * fse3u(ji,jj,jk) / e1u(ji,jj) * umask(ji,jj,jk) |
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| 125 | zeev(ji,jj) = e1v(ji,jj) * fse3v(ji,jj,jk) / e2v(ji,jj) * vmask(ji,jj,jk) |
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| 126 | #endif |
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| 127 | END DO |
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| 128 | END DO |
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| 129 | |
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| 130 | ! Laplacian |
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| 131 | ! First derivative (gradient) |
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| 132 | DO jj = 1, jpjm1 |
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| 133 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 134 | ztu(ji,jj,jk) = zeeu(ji,jj) * ( tb(ji+1,jj ,jk) - tb(ji,jj,jk) ) |
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| 135 | zsu(ji,jj,jk) = zeeu(ji,jj) * ( sb(ji+1,jj ,jk) - sb(ji,jj,jk) ) |
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| 136 | ztv(ji,jj,jk) = zeev(ji,jj) * ( tb(ji ,jj+1,jk) - tb(ji,jj,jk) ) |
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| 137 | zsv(ji,jj,jk) = zeev(ji,jj) * ( sb(ji ,jj+1,jk) - sb(ji,jj,jk) ) |
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| 138 | END DO |
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| 139 | END DO |
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| 140 | ! Second derivative (divergence) |
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| 141 | DO jj = 2, jpjm1 |
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| 142 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 143 | #if ! defined key_zco |
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| 144 | zcoef = 1. / ( 6. * fse3t(ji,jj,jk) ) |
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| 145 | #endif |
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| 146 | zltu(ji,jj,jk) = ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) ) * zcoef |
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| 147 | zlsu(ji,jj,jk) = ( zsu(ji,jj,jk) - zsu(ji-1,jj,jk) ) * zcoef |
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| 148 | zltv(ji,jj,jk) = ( ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) * zcoef |
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| 149 | zlsv(ji,jj,jk) = ( zsv(ji,jj,jk) - zsv(ji,jj-1,jk) ) * zcoef |
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| 150 | END DO |
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| 151 | END DO |
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| 152 | ! ! ================= |
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| 153 | END DO ! End of slab |
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| 154 | ! ! ================= |
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| 155 | |
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| 156 | ! Lateral boundary conditions on the laplacian (zlt,zls) (unchanged sgn) |
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| 157 | CALL lbc_lnk( zltu, 'T', 1. ) ; CALL lbc_lnk( zlsu, 'T', 1. ) |
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| 158 | CALL lbc_lnk( zltv, 'T', 1. ) ; CALL lbc_lnk( zlsv, 'T', 1. ) |
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| 159 | |
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| 160 | ! ! =============== |
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| 161 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 162 | ! ! =============== |
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| 163 | ! Horizontal advective fluxes |
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| 164 | DO jj = 1, jpjm1 |
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| 165 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 166 | ! volume fluxes * 1/2 |
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| 167 | #if defined key_zco |
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| 168 | zfui = 0.5 * e2u(ji,jj) * pun(ji,jj,jk) |
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| 169 | zfvj = 0.5 * e1v(ji,jj) * pvn(ji,jj,jk) |
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| 170 | #else |
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| 171 | zfui = 0.5 * e2u(ji,jj) * fse3u(ji,jj,jk) * pun(ji,jj,jk) |
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| 172 | zfvj = 0.5 * e1v(ji,jj) * fse3v(ji,jj,jk) * pvn(ji,jj,jk) |
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| 173 | #endif |
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| 174 | ! upstream scheme |
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| 175 | zfp_ui = zfui + ABS( zfui ) |
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| 176 | zfp_vj = zfvj + ABS( zfvj ) |
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| 177 | zfm_ui = zfui - ABS( zfui ) |
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| 178 | zfm_vj = zfvj - ABS( zfvj ) |
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| 179 | ! centered scheme |
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| 180 | zcenut = zfui * ( tn(ji,jj,jk) + tn(ji+1,jj ,jk) ) |
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| 181 | zcenvt = zfvj * ( tn(ji,jj,jk) + tn(ji ,jj+1,jk) ) |
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| 182 | zcenus = zfui * ( sn(ji,jj,jk) + sn(ji+1,jj ,jk) ) |
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| 183 | zcenvs = zfvj * ( sn(ji,jj,jk) + sn(ji ,jj+1,jk) ) |
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| 184 | ! mixed centered / upstream scheme |
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| 185 | zwx(ji,jj,jk) = zcenut - zfp_ui * zltu(ji,jj,jk) -zfm_ui * zltu(ji+1,jj,jk) |
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| 186 | zwy(ji,jj,jk) = zcenvt - zfp_vj * zltv(ji,jj,jk) -zfm_vj * zltv(ji,jj+1,jk) |
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| 187 | zww(ji,jj,jk) = zcenus - zfp_ui * zlsu(ji,jj,jk) -zfm_ui * zlsu(ji+1,jj,jk) |
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| 188 | zwz(ji,jj,jk) = zcenvs - zfp_vj * zlsv(ji,jj,jk) -zfm_vj * zlsv(ji,jj+1,jk) |
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| 189 | END DO |
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| 190 | END DO |
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| 191 | |
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| 192 | ! Tracer flux divergence at t-point added to the general trend |
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| 193 | DO jj = 2, jpjm1 |
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| 194 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 195 | ! horizontal advective trends |
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| 196 | #if defined key_zco |
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| 197 | zbtr = e1e2tr(ji,jj) |
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| 198 | #else |
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| 199 | zbtr = e1e2tr(ji,jj) / fse3t(ji,jj,jk) |
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| 200 | #endif |
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| 201 | zta = - zbtr * ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk) & |
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| 202 | & + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk) ) |
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| 203 | zsa = - zbtr * ( zww(ji,jj,jk) - zww(ji-1,jj ,jk) & |
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| 204 | & + zwz(ji,jj,jk) - zwz(ji ,jj-1,jk) ) |
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| 205 | ! add it to the general tracer trends |
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| 206 | ta(ji,jj,jk) = ta(ji,jj,jk) + zta |
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| 207 | sa(ji,jj,jk) = sa(ji,jj,jk) + zsa |
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| 208 | END DO |
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| 209 | END DO |
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| 210 | ! ! =============== |
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| 211 | END DO ! End of slab |
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| 212 | ! ! =============== |
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| 213 | |
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| 214 | ! Horizontal trend used in tra_adv_ztvd subroutine |
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| 215 | zltu(:,:,:) = ta(:,:,:) - ztrdt(:,:,:) |
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| 216 | zlsu(:,:,:) = sa(:,:,:) - ztrds(:,:,:) |
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| 217 | |
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| 218 | ! 3. Save the horizontal advective trends for diagnostic |
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| 219 | ! ------------------------------------------------------ |
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| 220 | IF( l_trdtra ) THEN |
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| 221 | ! Recompute the hoizontal advection zta & zsa trends computed |
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| 222 | ! at the step 2. above in making the difference between the new |
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| 223 | ! trends and the previous one ta()/sa - ztrdt()/ztrds() and add |
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| 224 | ! the term tn()/sn()*hdivn() to recover the Uh gradh(T/S) trends |
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| 225 | ztrdt(:,:,:) = 0.e0 ; ztrds(:,:,:) = 0.e0 |
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| 226 | ! |
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| 227 | ! T/S ZONAL advection trends |
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| 228 | DO jk = 1, jpkm1 |
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| 229 | DO jj = 2, jpjm1 |
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| 230 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 231 | !-- Compute zonal divergence by splitting hdivn (see divcur.F90) |
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| 232 | #if defined key_zco |
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| 233 | zbtr = e1e2tr(ji,jj) |
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| 234 | z_hdivn_x = ( e2u(ji ,jj) * pun(ji ,jj,jk) & |
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| 235 | & - e2u(ji-1,jj) * pun(ji-1,jj,jk) ) * zbtr |
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| 236 | #else |
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| 237 | zbtr = e1e2tr(ji,jj) / fse3t(ji,jj,jk) |
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| 238 | z_hdivn_x = ( e2u(ji ,jj) * fse3u(ji ,jj,jk) * pun(ji ,jj,jk) & |
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| 239 | & - e2u(ji-1,jj) * fse3u(ji-1,jj,jk) * pun(ji-1,jj,jk) ) * zbtr |
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| 240 | #endif |
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| 241 | ztrdt(ji,jj,jk) = - ( zwx(ji,jj,jk) - zwx(ji-1,jj,jk) ) * zbtr + tn(ji,jj,jk) * z_hdivn_x |
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| 242 | ztrds(ji,jj,jk) = - ( zww(ji,jj,jk) - zww(ji-1,jj,jk) ) * zbtr + sn(ji,jj,jk) * z_hdivn_x |
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| 243 | END DO |
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| 244 | END DO |
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| 245 | END DO |
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| 246 | CALL trd_mod(ztrdt, ztrds, jptra_trd_xad, 'TRA', kt) ! save the trends |
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| 247 | ! |
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| 248 | ! T/S MERIDIONAL advection trends |
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| 249 | DO jk = 1, jpkm1 |
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| 250 | DO jj = 2, jpjm1 |
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| 251 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 252 | !-- Compute merid. divergence by splitting hdivn (see divcur.F90) |
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| 253 | #if defined key_zco |
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| 254 | zbtr = e1e2tr(ji,jj) |
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| 255 | z_hdivn_y = ( e1v(ji, jj) * pvn(ji,jj ,jk) & |
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| 256 | & - e1v(ji,jj-1) * pvn(ji,jj-1,jk) ) * zbtr |
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| 257 | #else |
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| 258 | zbtr = e1e2tr(ji,jj) / fse3t(ji,jj,jk) |
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| 259 | z_hdivn_y = ( e1v(ji, jj) * fse3v(ji,jj ,jk) * pvn(ji,jj ,jk) & |
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| 260 | & - e1v(ji,jj-1) * fse3v(ji,jj-1,jk) * pvn(ji,jj-1,jk) ) * zbtr |
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| 261 | #endif |
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| 262 | ztrdt(ji,jj,jk) = - ( zwy(ji,jj,jk) - zwy(ji,jj-1,jk) ) * zbtr + tn(ji,jj,jk) * z_hdivn_y |
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| 263 | ztrds(ji,jj,jk) = - ( zwz(ji,jj,jk) - zwz(ji,jj-1,jk) ) * zbtr + sn(ji,jj,jk) * z_hdivn_y |
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| 264 | END DO |
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| 265 | END DO |
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| 266 | END DO |
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| 267 | CALL trd_mod(ztrdt, ztrds, jptra_trd_yad, 'TRA', kt) ! save the trends |
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| 268 | ! |
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| 269 | ENDIF |
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| 270 | |
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| 271 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ta, clinfo1=' ubs had - Ta: ', mask1=tmask, & |
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| 272 | & tab3d_2=sa, clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra' ) |
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| 273 | |
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| 274 | ! "zonal" mean advective heat and salt transport |
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| 275 | IF( ln_diaptr .AND. ( MOD( kt, nf_ptr ) == 0 ) ) THEN |
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| 276 | IF( lk_zco ) THEN |
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| 277 | DO jk = 1, jpkm1 |
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| 278 | DO jj = 2, jpjm1 |
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| 279 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 280 | zwy(ji,jj,jk) = zwy(ji,jj,jk) * fse3v(ji,jj,jk) |
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| 281 | zwz(ji,jj,jk) = zwz(ji,jj,jk) * fse3v(ji,jj,jk) |
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| 282 | END DO |
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| 283 | END DO |
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| 284 | END DO |
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| 285 | ENDIF |
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| 286 | pht_adv(:) = ptr_vj( zwy(:,:,:) ) |
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| 287 | pst_adv(:) = ptr_vj( zwz(:,:,:) ) |
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| 288 | ENDIF |
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| 289 | |
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| 290 | ! II. Vertical advection |
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| 291 | ! ---------------------- |
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| 292 | IF( l_trdtra ) THEN ! Save ta and sa trends |
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| 293 | ztrdt(:,:,:) = ta(:,:,:) |
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| 294 | ztrds(:,:,:) = sa(:,:,:) |
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| 295 | ENDIF |
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| 296 | |
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| 297 | ! TVD scheme the vertical direction |
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| 298 | CALL tra_adv_ztvd(kt, pwn, zltu, zlsu) |
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| 299 | |
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| 300 | IF( l_trdtra ) THEN ! Save the final vertical advective trends |
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| 301 | DO jk = 1, jpkm1 |
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| 302 | DO jj = 2, jpjm1 |
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| 303 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 304 | #if defined key_zco |
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| 305 | zbtr = e1e2tr(ji,jj) |
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| 306 | z_hdivn_x = e2u(ji,jj)*pun(ji,jj,jk) - e2u(ji-1,jj)*pun(ji-1,jj,jk) |
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| 307 | z_hdivn_y = e1v(ji,jj)*pvn(ji,jj,jk) - e1v(ji,jj-1)*pvn(ji,jj-1,jk) |
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| 308 | #else |
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| 309 | zbtr = e1e2tr(ji,jj) / fse3t(ji,jj,jk) |
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| 310 | z_hdivn_x = e2u(ji,jj)*fse3u(ji,jj,jk)*pun(ji,jj,jk) - e2u(ji-1,jj)*fse3u(ji-1,jj,jk)*pun(ji-1,jj,jk) |
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| 311 | z_hdivn_y = e1v(ji,jj)*fse3v(ji,jj,jk)*pvn(ji,jj,jk) - e1v(ji,jj-1)*fse3v(ji,jj-1,jk)*pvn(ji,jj-1,jk) |
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| 312 | #endif |
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| 313 | z_hdivn = (z_hdivn_x + z_hdivn_y) * zbtr |
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| 314 | zbtr = e1e2tr(ji,jj) / fse3t(ji,jj,jk) |
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| 315 | ztrdt(ji,jj,jk) = ta(ji,jj,jk) - ztrdt(ji,jj,jk) - tn(ji,jj,jk) * z_hdivn |
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| 316 | ztrds(ji,jj,jk) = sa(ji,jj,jk) - ztrds(ji,jj,jk) - sn(ji,jj,jk) * z_hdivn |
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| 317 | END DO |
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| 318 | END DO |
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| 319 | END DO |
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| 320 | CALL trd_mod(ztrdt, ztrds, jptra_trd_zad, 'TRA', kt) ! <<< ADD TO PREVIOUSLY COMPUTED |
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| 321 | ! |
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| 322 | ENDIF |
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| 323 | |
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| 324 | IF(ln_ctl) CALL prt_ctl( tab3d_1=ta, clinfo1=' ubs zad - Ta: ', mask1=tmask, & |
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| 325 | & tab3d_2=sa, clinfo2= ' Sa: ', mask2=tmask, clinfo3='tra') |
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| 326 | ! |
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| 327 | END SUBROUTINE tra_adv_ubs |
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| 328 | |
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| 329 | |
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| 330 | SUBROUTINE tra_adv_ztvd( kt, pwn, zttrd, zstrd ) |
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| 331 | !!---------------------------------------------------------------------- |
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| 332 | !! *** ROUTINE tra_adv_ztvd *** |
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| 333 | !! |
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| 334 | !! ** Purpose : Compute the now trend due to total advection of |
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| 335 | !! tracers and add it to the general trend of tracer equations |
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| 336 | !! |
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| 337 | !! ** Method : TVD scheme, i.e. 2nd order centered scheme with |
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| 338 | !! corrected flux (monotonic correction) |
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| 339 | !! note: - this advection scheme needs a leap-frog time scheme |
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| 340 | !! |
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| 341 | !! ** Action : - update (ta,sa) with the now advective tracer trends |
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| 342 | !! - save the trends in (ztrdt,ztrds) ('key_trdtra') |
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| 343 | !!---------------------------------------------------------------------- |
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| 344 | INTEGER , INTENT(in) :: kt ! ocean time-step |
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| 345 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj,jpk) :: pwn ! verical effective velocity |
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| 346 | REAL(wp), INTENT(in), DIMENSION(jpi,jpj,jpk) :: zttrd, zstrd ! lateral advective trends on T & S |
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| 347 | !! |
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| 348 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 349 | REAL(wp) :: z2dtt, zbtr, zew, z2 ! temporary scalar |
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| 350 | REAL(wp) :: ztak, zfp_wk ! " " |
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| 351 | REAL(wp) :: zsak, zfm_wk ! " " |
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| 352 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: zti, ztw ! temporary 3D workspace |
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| 353 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: zsi, zsw ! " " |
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| 354 | !!---------------------------------------------------------------------- |
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| 355 | |
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| 356 | IF( kt == nit000 .AND. lwp ) THEN |
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| 357 | WRITE(numout,*) |
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| 358 | WRITE(numout,*) 'tra_adv_ztvd : vertical TVD advection scheme' |
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| 359 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 360 | ENDIF |
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| 361 | |
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| 362 | IF( neuler == 0 .AND. kt == nit000 ) THEN ; z2 = 1. |
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| 363 | ELSE ; z2 = 2. |
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| 364 | ENDIF |
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| 365 | |
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| 366 | ! Bottom value : flux set to zero |
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| 367 | ! -------------- |
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| 368 | ztw(:,:,jpk) = 0.e0 ; zsw(:,:,jpk) = 0.e0 |
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| 369 | zti (:,:,:) = 0.e0 ; zsi (:,:,:) = 0.e0 |
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| 370 | |
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| 371 | |
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| 372 | ! upstream advection with initial mass fluxes & intermediate update |
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| 373 | ! ------------------------------------------------------------------- |
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| 374 | ! Surface value |
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| 375 | IF( lk_vvl ) THEN |
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| 376 | ! variable volume : flux set to zero |
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| 377 | ztw(:,:,1) = 0.e0 |
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| 378 | zsw(:,:,1) = 0.e0 |
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| 379 | ELSE |
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| 380 | ! free surface-constant volume |
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| 381 | DO jj = 1, jpj |
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| 382 | DO ji = 1, jpi |
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| 383 | zew = e1t(ji,jj) * e2t(ji,jj) * pwn(ji,jj,1) |
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| 384 | ztw(ji,jj,1) = zew * tb(ji,jj,1) |
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| 385 | zsw(ji,jj,1) = zew * sb(ji,jj,1) |
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| 386 | END DO |
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| 387 | END DO |
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| 388 | ENDIF |
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| 389 | |
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| 390 | ! Interior value |
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| 391 | DO jk = 2, jpkm1 |
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| 392 | DO jj = 1, jpj |
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| 393 | DO ji = 1, jpi |
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| 394 | zew = 0.5 * e1t(ji,jj) * e2t(ji,jj) * pwn(ji,jj,jk) |
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| 395 | zfp_wk = zew + ABS( zew ) |
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| 396 | zfm_wk = zew - ABS( zew ) |
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| 397 | ztw(ji,jj,jk) = zfp_wk * tb(ji,jj,jk) + zfm_wk * tb(ji,jj,jk-1) |
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| 398 | zsw(ji,jj,jk) = zfp_wk * sb(ji,jj,jk) + zfm_wk * sb(ji,jj,jk-1) |
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| 399 | END DO |
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| 400 | END DO |
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| 401 | END DO |
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| 402 | |
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| 403 | ! update and guess with monotonic sheme |
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| 404 | DO jk = 1, jpkm1 |
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| 405 | z2dtt = z2 * rdttra(jk) |
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| 406 | DO jj = 2, jpjm1 |
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| 407 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 408 | zbtr = 1./ ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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| 409 | ztak = - ( ztw(ji,jj,jk) - ztw(ji,jj,jk+1) ) * zbtr |
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| 410 | zsak = - ( zsw(ji,jj,jk) - zsw(ji,jj,jk+1) ) * zbtr |
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| 411 | ta(ji,jj,jk) = ta(ji,jj,jk) + ztak |
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| 412 | sa(ji,jj,jk) = sa(ji,jj,jk) + zsak |
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| 413 | zti (ji,jj,jk) = ( tb(ji,jj,jk) + z2dtt * ( ztak + zttrd(ji,jj,jk) ) ) * tmask(ji,jj,jk) |
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| 414 | zsi (ji,jj,jk) = ( sb(ji,jj,jk) + z2dtt * ( zsak + zstrd(ji,jj,jk) ) ) * tmask(ji,jj,jk) |
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| 415 | END DO |
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| 416 | END DO |
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| 417 | END DO |
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| 418 | |
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| 419 | ! Lateral boundary conditions on zti, zsi (unchanged sign) |
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| 420 | CALL lbc_lnk( zti, 'T', 1. ) |
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| 421 | CALL lbc_lnk( zsi, 'T', 1. ) |
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| 422 | |
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| 423 | |
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| 424 | ! antidiffusive flux : high order minus low order |
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| 425 | ! ------------------------------------------------- |
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| 426 | ! Surface value |
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| 427 | ztw(:,:,1) = 0.e0 ; zsw(:,:,1) = 0.e0 |
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| 428 | |
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| 429 | ! Interior value |
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| 430 | DO jk = 2, jpkm1 |
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| 431 | DO jj = 1, jpj |
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| 432 | DO ji = 1, jpi |
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| 433 | zew = 0.5 * e1t(ji,jj) * e2t(ji,jj) * pwn(ji,jj,jk) |
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| 434 | ztw(ji,jj,jk) = zew * ( tn(ji,jj,jk) + tn(ji,jj,jk-1) ) - ztw(ji,jj,jk) |
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| 435 | zsw(ji,jj,jk) = zew * ( sn(ji,jj,jk) + sn(ji,jj,jk-1) ) - zsw(ji,jj,jk) |
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| 436 | END DO |
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| 437 | END DO |
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| 438 | END DO |
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| 439 | |
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| 440 | ! monotonicity algorithm |
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| 441 | ! ------------------------ |
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| 442 | CALL nonosc_z( tb, ztw, zti, z2 ) |
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| 443 | CALL nonosc_z( sb, zsw, zsi, z2 ) |
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| 444 | |
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| 445 | |
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| 446 | ! final trend with corrected fluxes |
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| 447 | ! ----------------------------------- |
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| 448 | DO jk = 1, jpkm1 |
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| 449 | DO jj = 2, jpjm1 |
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| 450 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 451 | zbtr = 1. / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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| 452 | ! k- vertical advective trends |
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| 453 | ztak = - ( ztw(ji,jj,jk) - ztw(ji,jj,jk+1) ) * zbtr |
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| 454 | zsak = - ( zsw(ji,jj,jk) - zsw(ji,jj,jk+1) ) * zbtr |
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| 455 | ! add them to the general tracer trends |
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| 456 | ta(ji,jj,jk) = ta(ji,jj,jk) + ztak |
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| 457 | sa(ji,jj,jk) = sa(ji,jj,jk) + zsak |
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| 458 | END DO |
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| 459 | END DO |
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| 460 | END DO |
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| 461 | ! |
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| 462 | END SUBROUTINE tra_adv_ztvd |
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| 463 | |
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| 464 | |
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| 465 | SUBROUTINE nonosc_z( pbef, pcc, paft, prdt ) |
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| 466 | !!--------------------------------------------------------------------- |
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| 467 | !! *** ROUTINE nonosc_z *** |
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| 468 | !! |
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| 469 | !! ** Purpose : compute monotonic tracer fluxes from the upstream |
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| 470 | !! scheme and the before field by a nonoscillatory algorithm |
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| 471 | !! |
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| 472 | !! ** Method : ... ??? |
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| 473 | !! warning : pbef and paft must be masked, but the boundaries |
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| 474 | !! conditions on the fluxes are not necessary zalezak (1979) |
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| 475 | !! drange (1995) multi-dimensional forward-in-time and upstream- |
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| 476 | !! in-space based differencing for fluid |
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| 477 | !!---------------------------------------------------------------------- |
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| 478 | REAL(wp), INTENT(in ) :: prdt ! ??? |
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| 479 | REAL(wp), INTENT(inout), DIMENSION (jpi,jpj,jpk) :: pbef ! before field |
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| 480 | REAL(wp), INTENT(inout), DIMENSION (jpi,jpj,jpk) :: paft ! after field |
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| 481 | REAL(wp), INTENT(inout), DIMENSION (jpi,jpj,jpk) :: pcc ! monotonic flux in the k direction |
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| 482 | !! |
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| 483 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 484 | INTEGER :: ikm1 |
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| 485 | REAL(wp) :: zpos, zneg, zbt, za, zb, zc, zbig, zrtrn, z2dtt |
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| 486 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: zbetup, zbetdo |
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| 487 | !!---------------------------------------------------------------------- |
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| 488 | |
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| 489 | zbig = 1.e+40 |
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| 490 | zrtrn = 1.e-15 |
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| 491 | zbetup(:,:,:) = 0.e0 ; zbetdo(:,:,:) = 0.e0 |
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| 492 | |
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| 493 | ! Search local extrema |
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| 494 | ! -------------------- |
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| 495 | ! large negative value (-zbig) inside land |
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| 496 | pbef(:,:,:) = pbef(:,:,:) * tmask(:,:,:) - zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 497 | paft(:,:,:) = paft(:,:,:) * tmask(:,:,:) - zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 498 | ! search maximum in neighbourhood |
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| 499 | DO jk = 1, jpkm1 |
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| 500 | ikm1 = MAX(jk-1,1) |
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| 501 | DO jj = 2, jpjm1 |
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| 502 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 503 | zbetup(ji,jj,jk) = MAX( pbef(ji ,jj ,jk ), paft(ji ,jj ,jk ), & |
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| 504 | & pbef(ji ,jj ,ikm1), pbef(ji ,jj ,jk+1), & |
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| 505 | & paft(ji ,jj ,ikm1), paft(ji ,jj ,jk+1) ) |
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| 506 | END DO |
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| 507 | END DO |
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| 508 | END DO |
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| 509 | ! large positive value (+zbig) inside land |
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| 510 | pbef(:,:,:) = pbef(:,:,:) * tmask(:,:,:) + zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 511 | paft(:,:,:) = paft(:,:,:) * tmask(:,:,:) + zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 512 | ! search minimum in neighbourhood |
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| 513 | DO jk = 1, jpkm1 |
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| 514 | ikm1 = MAX(jk-1,1) |
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| 515 | DO jj = 2, jpjm1 |
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| 516 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 517 | zbetdo(ji,jj,jk) = MIN( pbef(ji ,jj ,jk ), paft(ji ,jj ,jk ), & |
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| 518 | & pbef(ji ,jj ,ikm1), pbef(ji ,jj ,jk+1), & |
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| 519 | & paft(ji ,jj ,ikm1), paft(ji ,jj ,jk+1) ) |
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| 520 | END DO |
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| 521 | END DO |
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| 522 | END DO |
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| 523 | |
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| 524 | ! restore masked values to zero |
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| 525 | pbef(:,:,:) = pbef(:,:,:) * tmask(:,:,:) |
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| 526 | paft(:,:,:) = paft(:,:,:) * tmask(:,:,:) |
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| 527 | |
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| 528 | |
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| 529 | ! 2. Positive and negative part of fluxes and beta terms |
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| 530 | ! ------------------------------------------------------ |
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| 531 | |
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| 532 | DO jk = 1, jpkm1 |
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| 533 | z2dtt = prdt * rdttra(jk) |
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| 534 | DO jj = 2, jpjm1 |
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| 535 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 536 | ! positive & negative part of the flux |
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| 537 | zpos = MAX( 0., pcc(ji ,jj ,jk+1) ) - MIN( 0., pcc(ji ,jj ,jk ) ) |
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| 538 | zneg = MAX( 0., pcc(ji ,jj ,jk ) ) - MIN( 0., pcc(ji ,jj ,jk+1) ) |
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| 539 | ! up & down beta terms |
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| 540 | zbt = e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) / z2dtt |
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| 541 | zbetup(ji,jj,jk) = ( zbetup(ji,jj,jk) - paft(ji,jj,jk) ) / (zpos+zrtrn) * zbt |
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| 542 | zbetdo(ji,jj,jk) = ( paft(ji,jj,jk) - zbetdo(ji,jj,jk) ) / (zneg+zrtrn) * zbt |
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| 543 | END DO |
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| 544 | END DO |
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| 545 | END DO |
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| 546 | |
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| 547 | ! monotonic flux in the k direction, i.e. pcc |
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| 548 | ! ------------------------------------------- |
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| 549 | DO jk = 2, jpkm1 |
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| 550 | DO jj = 2, jpjm1 |
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| 551 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 552 | |
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| 553 | za = MIN( 1., zbetdo(ji,jj,jk), zbetup(ji,jj,jk-1) ) |
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| 554 | zb = MIN( 1., zbetup(ji,jj,jk), zbetdo(ji,jj,jk-1) ) |
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| 555 | zc = 0.5 * ( 1.e0 + SIGN( 1.e0, pcc(ji,jj,jk) ) ) |
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| 556 | pcc(ji,jj,jk) = pcc(ji,jj,jk) * ( zc * za + ( 1.e0 - zc) * zb ) |
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| 557 | END DO |
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| 558 | END DO |
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| 559 | END DO |
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| 560 | ! |
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| 561 | END SUBROUTINE nonosc_z |
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| 562 | |
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| 563 | !!====================================================================== |
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| 564 | END MODULE traadv_ubs |
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