[503] | 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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[2024] | 6 | !! History : 1.0 ! 2006-08 (L. Debreu, R. Benshila) Original code |
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| 7 | !! 3.3 ! 2010-05 (C. Ethe, G. Madec) merge TRC-TRA + switch from velocity to transport |
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[503] | 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! tra_adv_ubs : update the tracer trend with the horizontal |
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| 12 | !! advection trends using a third order biaised scheme |
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| 13 | !!---------------------------------------------------------------------- |
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| 14 | USE oce ! ocean dynamics and active tracers |
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| 15 | USE dom_oce ! ocean space and time domain |
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[2024] | 16 | USE trdmod_oce ! ocean space and time domain |
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| 17 | USE trdtra |
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[503] | 18 | USE lib_mpp |
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| 19 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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| 20 | USE in_out_manager ! I/O manager |
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| 21 | USE diaptr ! poleward transport diagnostics |
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| 22 | USE dynspg_oce ! choice/control of key cpp for surface pressure gradient |
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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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[2024] | 29 | LOGICAL :: l_trd ! flag to compute trends or not |
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[503] | 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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[2034] | 35 | !! NEMO/OPA 3.3 , LOCEAN-IPSL (2010) |
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[1152] | 36 | !! $Id$ |
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[503] | 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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[2034] | 42 | SUBROUTINE tra_adv_ubs ( kt, cdtype, pun, pvn, pwn, & |
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| 43 | & ptb, ptn, pta, kjpt ) |
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[503] | 44 | !!---------------------------------------------------------------------- |
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| 45 | !! *** ROUTINE tra_adv_ubs *** |
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| 46 | !! |
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| 47 | !! ** Purpose : Compute the now trend due to the advection of tracers |
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| 48 | !! and add it to the general trend of passive tracer equations. |
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| 49 | !! |
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[519] | 50 | !! ** Method : The upstream biased third (UBS) is order scheme based |
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| 51 | !! on an upstream-biased parabolic interpolation (Shchepetkin and McWilliams 2005) |
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| 52 | !! It is only used in the horizontal direction. |
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| 53 | !! For example the i-component of the advective fluxes are given by : |
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| 54 | !! ! e1u e3u un ( mi(Tn) - zltu(i ) ) if un(i) >= 0 |
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| 55 | !! zwx = ! or |
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| 56 | !! ! e1u e3u un ( mi(Tn) - zltu(i+1) ) if un(i) < 0 |
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| 57 | !! where zltu is the second derivative of the before temperature field: |
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| 58 | !! zltu = 1/e3t di[ e2u e3u / e1u di[Tb] ] |
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| 59 | !! This results in a dissipatively dominant (i.e. hyper-diffusive) |
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| 60 | !! truncation error. The overall performance of the advection scheme |
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| 61 | !! is similar to that reported in (Farrow and Stevens, 1995). |
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| 62 | !! For stability reasons, the first term of the fluxes which corresponds |
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| 63 | !! to a second order centered scheme is evaluated using the now velocity |
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| 64 | !! (centered in time) while the second term which is the diffusive part |
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| 65 | !! of the scheme, is evaluated using the before velocity (forward in time). |
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| 66 | !! Note that UBS is not positive. Do not use it on passive tracers. |
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| 67 | !! On the vertical, the advection is evaluated using a TVD scheme, as |
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| 68 | !! the UBS have been found to be too diffusive. |
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[503] | 69 | !! |
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[2034] | 70 | !! ** Action : - update (pta) with the now advective tracer trends |
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[519] | 71 | !! |
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| 72 | !! Reference : Shchepetkin, A. F., J. C. McWilliams, 2005, Ocean Modelling, 9, 347-404. |
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| 73 | !! Farrow, D.E., Stevens, D.P., 1995, J. Phys. Ocean. 25, 1731Ð1741. |
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[503] | 74 | !!---------------------------------------------------------------------- |
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[2024] | 75 | !!* Module used |
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| 76 | USE oce , zwx => ua ! use ua as workspace |
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| 77 | USE oce , zwy => va ! use va as workspace |
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| 78 | !!* Arguments |
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| 79 | INTEGER , INTENT(in ) :: kt ! ocean time-step index |
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| 80 | CHARACTER(len=3), INTENT(in ) :: cdtype ! =TRA or TRC (tracer indicator) |
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| 81 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,jpk) :: pun, pvn, pwn ! 3 ocean velocity components |
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| 82 | INTEGER , INTENT(in ) :: kjpt ! number of tracers |
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[2034] | 83 | REAL(wp) , INTENT(in ), DIMENSION(jpi,jpj,jpk,kjpt) :: ptb, ptn ! before and now tracer fields |
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| 84 | REAL(wp) , INTENT(inout), DIMENSION(jpi,jpj,jpk,kjpt) :: pta ! tracer trend |
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[2024] | 85 | !!* Local declarations |
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| 86 | INTEGER :: ji, jj, jk, jn ! dummy loop indices |
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| 87 | REAL(wp) :: ztra, zbtr, zcoef ! temporary scalars |
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| 88 | REAL(wp) :: zfp_ui, zfm_ui, zcenut ! " " |
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| 89 | REAL(wp) :: zfp_vj, zfm_vj, zcenvt ! " " ! " " |
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| 90 | REAL(wp) :: z2dtt, z2 |
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| 91 | REAL(wp) :: ztak, zfp_wk, zfm_wk ! " " |
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| 92 | REAL(wp) :: zeeu, zeev, z_hdivn |
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| 93 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: ztu, ztv, zltu , zltv ! " " |
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| 94 | REAL(wp), DIMENSION(jpi,jpj,jpk) :: zti, ztw ! " " |
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[503] | 95 | !!---------------------------------------------------------------------- |
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| 96 | |
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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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[2024] | 103 | l_trd = .FALSE. |
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| 104 | IF( ( cdtype == 'TRA' .AND. l_trdtra ) .OR. ( cdtype == 'TRC' .AND. l_trdtrc ) ) l_trd = .TRUE. |
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[503] | 105 | ENDIF |
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[2024] | 106 | ! |
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| 107 | IF( neuler == 0 .AND. kt == nit000 ) THEN ; z2 = 1. |
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| 108 | ELSE ; z2 = 2. |
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| 109 | ENDIF |
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| 110 | ! |
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| 111 | ! ! =========== |
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| 112 | DO jn = 1, kjpt ! tracer loop |
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| 113 | ! ! =========== |
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| 114 | ! 1. Bottom value : flux set to zero |
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| 115 | ! ---------------------------------- |
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| 116 | zltu(:,:,jpk) = 0.e0 ; zltv(:,:,jpk) = 0.e0 |
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| 117 | ! ! =============== |
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| 118 | DO jk = 1, jpkm1 ! Horizontal slab |
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| 119 | ! ! =============== |
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| 120 | ! Laplacian |
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| 121 | ! First derivative (gradient) |
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| 122 | DO jj = 1, jpjm1 |
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| 123 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 124 | zeeu = e2u(ji,jj) * fse3u(ji,jj,jk) / e1u(ji,jj) * umask(ji,jj,jk) |
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| 125 | zeev = e1v(ji,jj) * fse3v(ji,jj,jk) / e2v(ji,jj) * vmask(ji,jj,jk) |
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[2034] | 126 | ztu(ji,jj,jk) = zeeu * ( ptb(ji+1,jj ,jk,jn) - ptb(ji,jj,jk,jn) ) |
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| 127 | ztv(ji,jj,jk) = zeev * ( ptb(ji ,jj+1,jk,jn) - ptb(ji,jj,jk,jn) ) |
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[2024] | 128 | END DO |
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[503] | 129 | END DO |
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[2024] | 130 | ! Second derivative (divergence) |
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| 131 | DO jj = 2, jpjm1 |
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| 132 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 133 | zcoef = 1. / ( 6. * fse3t(ji,jj,jk) ) |
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| 134 | zltu(ji,jj,jk) = ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) ) * zcoef |
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| 135 | zltv(ji,jj,jk) = ( ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) * zcoef |
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| 136 | END DO |
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[503] | 137 | END DO |
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[2024] | 138 | ! ! ================= |
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| 139 | END DO ! End of slab |
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| 140 | ! ! ================= |
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| 141 | |
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| 142 | ! Lateral boundary conditions on the laplacian (zlt) (unchanged sgn) |
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| 143 | CALL lbc_lnk( zltu, 'T', 1. ) ; CALL lbc_lnk( zltv, 'T', 1. ) |
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[503] | 144 | |
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[2024] | 145 | ! |
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| 146 | ! Horizontal advective fluxes |
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| 147 | DO jk = 1, jpkm1 |
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| 148 | DO jj = 1, jpjm1 |
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| 149 | DO ji = 1, fs_jpim1 ! vector opt. |
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| 150 | ! upstream transport |
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| 151 | zfp_ui = pun(ji,jj,jk) + ABS( pun(ji,jj,jk) ) |
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| 152 | zfm_ui = pun(ji,jj,jk) - ABS( pun(ji,jj,jk) ) |
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| 153 | zfp_vj = pvn(ji,jj,jk) + ABS( pvn(ji,jj,jk) ) |
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| 154 | zfm_vj = pvn(ji,jj,jk) - ABS( pvn(ji,jj,jk) ) |
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| 155 | ! centered scheme |
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[2034] | 156 | zcenut = 0.5 * pun(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji+1,jj ,jk,jn) ) |
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| 157 | zcenvt = 0.5 * pvn(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji ,jj+1,jk,jn) ) |
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[2024] | 158 | ! UBS scheme |
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| 159 | zwx(ji,jj,jk) = zcenut - zfp_ui * zltu(ji,jj,jk) - zfm_ui * zltu(ji+1,jj,jk) |
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| 160 | zwy(ji,jj,jk) = zcenvt - zfp_vj * zltv(ji,jj,jk) - zfm_vj * zltv(ji,jj+1,jk) |
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| 161 | END DO |
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[503] | 162 | END DO |
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[2024] | 163 | ENDDO |
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[503] | 164 | |
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[2034] | 165 | zltu(:,:,:) = pta(:,:,:,jn) ! store pta trends |
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[503] | 166 | |
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[2024] | 167 | ! Horizontal advective trends |
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[503] | 168 | DO jk = 1, jpkm1 |
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[2024] | 169 | ! Tracer flux divergence at t-point added to the general trend |
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[503] | 170 | DO jj = 2, jpjm1 |
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| 171 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2024] | 172 | zbtr = 1. / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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| 173 | ! horizontal advective |
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| 174 | ztra = - zbtr * ( zwx(ji,jj,jk) - zwx(ji-1,jj ,jk) & |
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| 175 | & + zwy(ji,jj,jk) - zwy(ji ,jj-1,jk) ) |
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| 176 | ! add it to the general tracer trends |
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[2034] | 177 | pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ztra |
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[503] | 178 | END DO |
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| 179 | END DO |
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[2024] | 180 | ! ! =============== |
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| 181 | END DO ! End of slab |
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| 182 | ! ! =============== |
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[503] | 183 | |
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[2024] | 184 | ! Horizontal trend used in tra_adv_ztvd subroutine |
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[2034] | 185 | zltu(:,:,:) = pta(:,:,:,jn) - zltu(:,:,:) |
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[503] | 186 | |
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[2024] | 187 | ! 3. Save the horizontal advective trends for diagnostic |
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| 188 | ! ------------------------------------------------------ |
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| 189 | ! ! trend diagnostics (contribution of upstream fluxes) |
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| 190 | IF( l_trd ) THEN |
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[2034] | 191 | CALL trd_tra( kt, cdtype, jn, jpt_trd_xad, zwx, pun, ptn(:,:,:,jn) ) |
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| 192 | CALL trd_tra( kt, cdtype, jn, jpt_trd_yad, zwy, pvn, ptn(:,:,:,jn) ) |
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[2024] | 193 | END IF |
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| 194 | ! ! "Poleward" heat and salt transports (contribution of upstream fluxes) |
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| 195 | IF( cdtype == 'TRA' .AND. ln_diaptr .AND. ( MOD( kt, nf_ptr ) == 0 ) ) THEN |
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| 196 | IF( lk_zco ) THEN |
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| 197 | DO jk = 1, jpkm1 |
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| 198 | DO jj = 2, jpjm1 |
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| 199 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 200 | zwy(ji,jj,jk) = zwy(ji,jj,jk) * fse3v(ji,jj,jk) |
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| 201 | END DO |
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[503] | 202 | END DO |
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| 203 | END DO |
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[2024] | 204 | ENDIF |
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| 205 | IF( jn == jp_tem ) pht_adv(:) = ptr_vj( zwy(:,:,:) ) |
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| 206 | IF( jn == jp_sal ) pst_adv(:) = ptr_vj( zwy(:,:,:) ) |
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[503] | 207 | ENDIF |
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[2024] | 208 | |
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| 209 | ! TVD scheme for the vertical direction |
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| 210 | ! ---------------------- |
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[2034] | 211 | IF( l_trd ) zltv(:,:,:) = pta(:,:,:,jn) ! store pta if trend diag. |
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[503] | 212 | |
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[2024] | 213 | ! Bottom value : flux set to zero |
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| 214 | ztw(:,:,jpk) = 0.e0 ; zti(:,:,jpk) = 0.e0 |
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[503] | 215 | |
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[2024] | 216 | ! Surface value |
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| 217 | IF( lk_vvl ) THEN ; ztw(:,:,1) = 0.e0 ! variable volume : flux set to zero |
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[2034] | 218 | ELSE ; ztw(:,:,1) = pwn(:,:,1) * ptb(:,:,1,jn) ! free constant surface |
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[2024] | 219 | ENDIF |
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| 220 | ! upstream advection with initial mass fluxes & intermediate update |
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| 221 | ! ------------------------------------------------------------------- |
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| 222 | ! Interior value |
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| 223 | DO jk = 2, jpkm1 |
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| 224 | DO jj = 1, jpj |
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| 225 | DO ji = 1, jpi |
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| 226 | zfp_wk = pwn(ji,jj,jk) + ABS( pwn(ji,jj,jk) ) |
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| 227 | zfm_wk = pwn(ji,jj,jk) - ABS( pwn(ji,jj,jk) ) |
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[2034] | 228 | ztw(ji,jj,jk) = 0.5 * ( zfp_wk * ptb(ji,jj,jk,jn) + zfm_wk * ptb(ji,jj,jk-1,jn) ) |
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[2024] | 229 | END DO |
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| 230 | END DO |
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| 231 | END DO |
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| 232 | ! update and guess with monotonic sheme |
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[503] | 233 | DO jk = 1, jpkm1 |
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[2024] | 234 | z2dtt = z2 * rdttra(jk) |
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[503] | 235 | DO jj = 2, jpjm1 |
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| 236 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2024] | 237 | zbtr = 1. / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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| 238 | ztak = - ( ztw(ji,jj,jk) - ztw(ji,jj,jk+1) ) * zbtr |
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[2034] | 239 | pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ztak |
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| 240 | zti(ji,jj,jk) = ( ptb(ji,jj,jk,jn) + z2dtt * ( ztak + zltu(ji,jj,jk) ) ) * tmask(ji,jj,jk) |
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[503] | 241 | END DO |
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| 242 | END DO |
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| 243 | END DO |
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| 244 | ! |
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[2024] | 245 | CALL lbc_lnk( zti, 'T', 1. ) ! Lateral boundary conditions on zti, zsi (unchanged sign) |
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[503] | 246 | |
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[2024] | 247 | ! antidiffusive flux : high order minus low order |
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| 248 | ztw(:,:,1) = 0.e0 ! Surface value |
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| 249 | DO jk = 2, jpkm1 ! Interior value |
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| 250 | DO jj = 1, jpj |
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| 251 | DO ji = 1, jpi |
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[2034] | 252 | ztw(ji,jj,jk) = 0.5 * pwn(ji,jj,jk) * ( ptn(ji,jj,jk,jn) + ptn(ji,jj,jk-1,jn) ) - ztw(ji,jj,jk) |
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[2024] | 253 | END DO |
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[503] | 254 | END DO |
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| 255 | END DO |
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[2024] | 256 | ! |
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[2034] | 257 | CALL nonosc_z( ptb(:,:,:,jn), ztw, zti, z2 ) ! monotonicity algorithm |
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[503] | 258 | |
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[2024] | 259 | ! final trend with corrected fluxes |
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| 260 | DO jk = 1, jpkm1 |
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| 261 | DO jj = 2, jpjm1 |
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| 262 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 263 | zbtr = 1. / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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| 264 | ! k- vertical advective trends |
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| 265 | ztra = - zbtr * ( ztw(ji,jj,jk) - ztw(ji,jj,jk+1) ) |
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| 266 | ! added to the general tracer trends |
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[2034] | 267 | pta(ji,jj,jk,jn) = pta(ji,jj,jk,jn) + ztra |
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[2024] | 268 | END DO |
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[503] | 269 | END DO |
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| 270 | END DO |
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| 271 | |
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[2024] | 272 | ! Save the final vertical advective trends |
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| 273 | IF( l_trd ) THEN ! vertical advective trend diagnostics |
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| 274 | DO jk = 1, jpkm1 ! (compute -w.dk[ptn]= -dk[w.ptn] + ptn.dk[w]) |
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| 275 | DO jj = 2, jpjm1 |
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| 276 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 277 | zbtr = 1.e0 / ( e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) ) |
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| 278 | z_hdivn = ( pwn(ji,jj,jk) - pwn(ji,jj,jk+1) ) * zbtr |
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[2034] | 279 | zltv(ji,jj,jk) = pta(ji,jj,jk,jn) - zltv(ji,jj,jk) + ptn(ji,jj,jk,jn) * z_hdivn |
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[2024] | 280 | END DO |
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| 281 | END DO |
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[503] | 282 | END DO |
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[2034] | 283 | CALL trd_tra( kt, cdtype, jn, jpt_trd_zad, zltv ) |
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[2024] | 284 | ENDIF |
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| 285 | ! |
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| 286 | ENDDO |
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[503] | 287 | ! |
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[2024] | 288 | END SUBROUTINE tra_adv_ubs |
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[503] | 289 | |
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| 290 | SUBROUTINE nonosc_z( pbef, pcc, paft, prdt ) |
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| 291 | !!--------------------------------------------------------------------- |
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| 292 | !! *** ROUTINE nonosc_z *** |
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| 293 | !! |
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| 294 | !! ** Purpose : compute monotonic tracer fluxes from the upstream |
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| 295 | !! scheme and the before field by a nonoscillatory algorithm |
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| 296 | !! |
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| 297 | !! ** Method : ... ??? |
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| 298 | !! warning : pbef and paft must be masked, but the boundaries |
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| 299 | !! conditions on the fluxes are not necessary zalezak (1979) |
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| 300 | !! drange (1995) multi-dimensional forward-in-time and upstream- |
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| 301 | !! in-space based differencing for fluid |
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| 302 | !!---------------------------------------------------------------------- |
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| 303 | REAL(wp), INTENT(in ) :: prdt ! ??? |
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[2024] | 304 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: pbef ! before field |
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[503] | 305 | REAL(wp), INTENT(inout), DIMENSION (jpi,jpj,jpk) :: paft ! after field |
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| 306 | REAL(wp), INTENT(inout), DIMENSION (jpi,jpj,jpk) :: pcc ! monotonic flux in the k direction |
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| 307 | !! |
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| 308 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 309 | INTEGER :: ikm1 |
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| 310 | REAL(wp) :: zpos, zneg, zbt, za, zb, zc, zbig, zrtrn, z2dtt |
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| 311 | REAL(wp), DIMENSION (jpi,jpj,jpk) :: zbetup, zbetdo |
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| 312 | !!---------------------------------------------------------------------- |
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| 313 | |
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| 314 | zbig = 1.e+40 |
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| 315 | zrtrn = 1.e-15 |
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| 316 | zbetup(:,:,:) = 0.e0 ; zbetdo(:,:,:) = 0.e0 |
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| 317 | |
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| 318 | ! Search local extrema |
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| 319 | ! -------------------- |
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| 320 | ! large negative value (-zbig) inside land |
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| 321 | pbef(:,:,:) = pbef(:,:,:) * tmask(:,:,:) - zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 322 | paft(:,:,:) = paft(:,:,:) * tmask(:,:,:) - zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 323 | ! search maximum in neighbourhood |
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| 324 | DO jk = 1, jpkm1 |
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| 325 | ikm1 = MAX(jk-1,1) |
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| 326 | DO jj = 2, jpjm1 |
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| 327 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 328 | zbetup(ji,jj,jk) = MAX( pbef(ji ,jj ,jk ), paft(ji ,jj ,jk ), & |
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| 329 | & pbef(ji ,jj ,ikm1), pbef(ji ,jj ,jk+1), & |
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| 330 | & paft(ji ,jj ,ikm1), paft(ji ,jj ,jk+1) ) |
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| 331 | END DO |
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| 332 | END DO |
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| 333 | END DO |
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| 334 | ! large positive value (+zbig) inside land |
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| 335 | pbef(:,:,:) = pbef(:,:,:) * tmask(:,:,:) + zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 336 | paft(:,:,:) = paft(:,:,:) * tmask(:,:,:) + zbig * ( 1.e0 - tmask(:,:,:) ) |
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| 337 | ! search minimum in neighbourhood |
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| 338 | DO jk = 1, jpkm1 |
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| 339 | ikm1 = MAX(jk-1,1) |
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| 340 | DO jj = 2, jpjm1 |
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| 341 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 342 | zbetdo(ji,jj,jk) = MIN( pbef(ji ,jj ,jk ), paft(ji ,jj ,jk ), & |
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| 343 | & pbef(ji ,jj ,ikm1), pbef(ji ,jj ,jk+1), & |
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| 344 | & paft(ji ,jj ,ikm1), paft(ji ,jj ,jk+1) ) |
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| 345 | END DO |
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| 346 | END DO |
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| 347 | END DO |
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| 348 | |
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| 349 | ! restore masked values to zero |
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| 350 | pbef(:,:,:) = pbef(:,:,:) * tmask(:,:,:) |
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| 351 | paft(:,:,:) = paft(:,:,:) * tmask(:,:,:) |
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| 352 | |
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[2024] | 353 | |
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[503] | 354 | ! 2. Positive and negative part of fluxes and beta terms |
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| 355 | ! ------------------------------------------------------ |
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| 356 | |
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| 357 | DO jk = 1, jpkm1 |
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| 358 | z2dtt = prdt * rdttra(jk) |
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| 359 | DO jj = 2, jpjm1 |
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| 360 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 361 | ! positive & negative part of the flux |
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| 362 | zpos = MAX( 0., pcc(ji ,jj ,jk+1) ) - MIN( 0., pcc(ji ,jj ,jk ) ) |
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| 363 | zneg = MAX( 0., pcc(ji ,jj ,jk ) ) - MIN( 0., pcc(ji ,jj ,jk+1) ) |
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| 364 | ! up & down beta terms |
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| 365 | zbt = e1t(ji,jj) * e2t(ji,jj) * fse3t(ji,jj,jk) / z2dtt |
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| 366 | zbetup(ji,jj,jk) = ( zbetup(ji,jj,jk) - paft(ji,jj,jk) ) / (zpos+zrtrn) * zbt |
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| 367 | zbetdo(ji,jj,jk) = ( paft(ji,jj,jk) - zbetdo(ji,jj,jk) ) / (zneg+zrtrn) * zbt |
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| 368 | END DO |
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| 369 | END DO |
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| 370 | END DO |
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| 371 | ! monotonic flux in the k direction, i.e. pcc |
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| 372 | ! ------------------------------------------- |
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| 373 | DO jk = 2, jpkm1 |
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| 374 | DO jj = 2, jpjm1 |
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| 375 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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| 376 | |
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| 377 | za = MIN( 1., zbetdo(ji,jj,jk), zbetup(ji,jj,jk-1) ) |
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| 378 | zb = MIN( 1., zbetup(ji,jj,jk), zbetdo(ji,jj,jk-1) ) |
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| 379 | zc = 0.5 * ( 1.e0 + SIGN( 1.e0, pcc(ji,jj,jk) ) ) |
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| 380 | pcc(ji,jj,jk) = pcc(ji,jj,jk) * ( zc * za + ( 1.e0 - zc) * zb ) |
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| 381 | END DO |
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| 382 | END DO |
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| 383 | END DO |
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| 384 | ! |
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| 385 | END SUBROUTINE nonosc_z |
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| 386 | |
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| 387 | !!====================================================================== |
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| 388 | END MODULE traadv_ubs |
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