| [3] | 1 | MODULE zdfric |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE zdfric *** |
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| 4 | !! Ocean physics: vertical mixing coefficient compute from the local |
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| 5 | !! Richardson number dependent formulation |
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| 6 | !!====================================================================== |
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| [1601] | 7 | !! History : OPA ! 1987-09 (P. Andrich) Original code |
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| 8 | !! 4.0 ! 1991-11 (G. Madec) |
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| [3294] | 9 | !! 7.0 ! 1996-01 (G. Madec) complete rewriting of multitasking suppression of common work arrays |
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| 10 | !! 8.0 ! 1997-06 (G. Madec) complete rewriting of zdfmix |
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| [1601] | 11 | !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module |
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| [2528] | 12 | !! 3.3 ! 2010-10 (C. Ethe, G. Madec) reorganisation of initialisation phase |
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| [3294] | 13 | !! 3.3.1! 2011-09 (P. Oddo) Mixed layer depth parameterization |
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| [1601] | 14 | !!---------------------------------------------------------------------- |
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| [3] | 15 | #if defined key_zdfric || defined key_esopa |
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| 16 | !!---------------------------------------------------------------------- |
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| 17 | !! 'key_zdfric' Kz = f(Ri) |
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| 18 | !!---------------------------------------------------------------------- |
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| [3625] | 19 | !! zdf_ric : update momentum and tracer Kz from the Richardson |
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| [3] | 20 | !! number computation |
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| [3625] | 21 | !! zdf_ric_init : initialization, namelist read, & parameters control |
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| [3] | 22 | !!---------------------------------------------------------------------- |
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| [3625] | 23 | USE oce ! ocean dynamics and tracers variables |
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| 24 | USE dom_oce ! ocean space and time domain variables |
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| 25 | USE zdf_oce ! ocean vertical physics |
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| 26 | USE in_out_manager ! I/O manager |
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| 27 | USE lbclnk ! ocean lateral boundary condition (or mpp link) |
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| 28 | USE lib_mpp ! MPP library |
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| 29 | USE wrk_nemo ! work arrays |
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| 30 | USE timing ! Timing |
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| 31 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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| [3] | 32 | |
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| [3294] | 33 | USE eosbn2, ONLY : nn_eos |
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| 34 | |
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| [3] | 35 | IMPLICIT NONE |
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| 36 | PRIVATE |
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| 37 | |
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| [2528] | 38 | PUBLIC zdf_ric ! called by step.F90 |
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| 39 | PUBLIC zdf_ric_init ! called by opa.F90 |
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| [9366] | 40 | PRIVATE ric_namelist |
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| [3] | 41 | |
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| [1537] | 42 | LOGICAL, PUBLIC, PARAMETER :: lk_zdfric = .TRUE. !: Richardson vertical mixing flag |
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| [3] | 43 | |
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| [4147] | 44 | ! !!* Namelist namzdf_ric : Richardson number dependent Kz * |
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| 45 | INTEGER :: nn_ric ! coefficient of the parameterization |
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| 46 | REAL(wp) :: rn_avmri ! maximum value of the vertical eddy viscosity |
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| 47 | REAL(wp) :: rn_alp ! coefficient of the parameterization |
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| 48 | REAL(wp) :: rn_ekmfc ! Ekman Factor Coeff |
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| 49 | REAL(wp) :: rn_mldmin ! minimum mixed layer (ML) depth |
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| 50 | REAL(wp) :: rn_mldmax ! maximum mixed layer depth |
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| 51 | REAL(wp) :: rn_wtmix ! Vertical eddy Diff. in the ML |
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| 52 | REAL(wp) :: rn_wvmix ! Vertical eddy Visc. in the ML |
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| 53 | LOGICAL :: ln_mldw ! Use or not the MLD parameters |
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| [3] | 54 | |
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| [2715] | 55 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: tmric !: coef. for the horizontal mean at t-point |
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| [1537] | 56 | |
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| [3] | 57 | !! * Substitutions |
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| 58 | # include "domzgr_substitute.h90" |
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| 59 | !!---------------------------------------------------------------------- |
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| [2715] | 60 | !! NEMO/OPA 4.0 , NEMO Consortium (2011) |
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| [2528] | 61 | !! $Id$ |
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| [2715] | 62 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| [247] | 63 | !!---------------------------------------------------------------------- |
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| [3] | 64 | CONTAINS |
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| 65 | |
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| [2715] | 66 | INTEGER FUNCTION zdf_ric_alloc() |
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| 67 | !!---------------------------------------------------------------------- |
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| 68 | !! *** FUNCTION zdf_ric_alloc *** |
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| 69 | !!---------------------------------------------------------------------- |
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| 70 | ALLOCATE( tmric(jpi,jpj,jpk) , STAT= zdf_ric_alloc ) |
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| 71 | ! |
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| 72 | IF( lk_mpp ) CALL mpp_sum ( zdf_ric_alloc ) |
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| 73 | IF( zdf_ric_alloc /= 0 ) CALL ctl_warn('zdf_ric_alloc: failed to allocate arrays') |
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| 74 | END FUNCTION zdf_ric_alloc |
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| 75 | |
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| 76 | |
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| [3] | 77 | SUBROUTINE zdf_ric( kt ) |
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| 78 | !!---------------------------------------------------------------------- |
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| 79 | !! *** ROUTINE zdfric *** |
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| 80 | !! |
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| 81 | !! ** Purpose : Compute the before eddy viscosity and diffusivity as |
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| [3294] | 82 | !! a function of the local richardson number. |
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| [3] | 83 | !! |
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| 84 | !! ** Method : Local richardson number dependent formulation of the |
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| [3294] | 85 | !! vertical eddy viscosity and diffusivity coefficients. |
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| [1601] | 86 | !! The eddy coefficients are given by: |
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| 87 | !! avm = avm0 + avmb |
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| 88 | !! avt = avm0 / (1 + rn_alp*ri) |
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| [3294] | 89 | !! with ri = N^2 / dz(u)**2 |
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| 90 | !! = e3w**2 * rn2/[ mi( dk(ub) )+mj( dk(vb) ) ] |
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| 91 | !! avm0= rn_avmri / (1 + rn_alp*ri)**nn_ric |
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| [1601] | 92 | !! Where ri is the before local Richardson number, |
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| 93 | !! rn_avmri is the maximum value reaches by avm and avt |
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| 94 | !! avmb and avtb are the background (or minimum) values |
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| 95 | !! and rn_alp, nn_ric are adjustable parameters. |
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| 96 | !! Typical values used are : avm0=1.e-2 m2/s, avmb=1.e-6 m2/s |
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| [1537] | 97 | !! avtb=1.e-7 m2/s, rn_alp=5. and nn_ric=2. |
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| [3] | 98 | !! a numerical threshold is impose on the vertical shear (1.e-20) |
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| [3294] | 99 | !! As second step compute Ekman depth from wind stress forcing |
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| 100 | !! and apply namelist provided vertical coeff within this depth. |
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| 101 | !! The Ekman depth is: |
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| 102 | !! Ustar = SQRT(Taum/rho0) |
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| 103 | !! ekd= rn_ekmfc * Ustar / f0 |
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| 104 | !! Large et al. (1994, eq.29) suggest rn_ekmfc=0.7; however, the derivation |
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| 105 | !! of the above equation indicates the value is somewhat arbitrary; therefore |
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| 106 | !! we allow the freedom to increase or decrease this value, if the |
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| 107 | !! Ekman depth estimate appears too shallow or too deep, respectively. |
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| 108 | !! Ekd is then limited by rn_mldmin and rn_mldmax provided in the |
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| 109 | !! namelist |
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| [3] | 110 | !! N.B. the mask are required for implicit scheme, and surface |
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| [1601] | 111 | !! and bottom value already set in zdfini.F90 |
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| [3] | 112 | !! |
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| [1601] | 113 | !! References : Pacanowski & Philander 1981, JPO, 1441-1451. |
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| [3294] | 114 | !! PFJ Lermusiaux 2001. |
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| [3] | 115 | !!---------------------------------------------------------------------- |
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| [3294] | 116 | USE phycst, ONLY: rsmall,rau0 |
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| 117 | USE sbc_oce, ONLY: taum |
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| [2715] | 118 | !! |
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| [3294] | 119 | INTEGER, INTENT( in ) :: kt ! ocean time-step |
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| [1537] | 120 | !! |
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| [3294] | 121 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 122 | REAL(wp) :: zcoef, zdku, zdkv, zri, z05alp, zflageos ! temporary scalars |
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| 123 | REAL(wp) :: zrhos, zustar |
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| 124 | REAL(wp), POINTER, DIMENSION(:,:) :: zwx, ekm_dep |
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| [1537] | 125 | !!---------------------------------------------------------------------- |
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| [3294] | 126 | ! |
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| 127 | IF( nn_timing == 1 ) CALL timing_start('zdf_ric') |
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| 128 | ! |
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| 129 | CALL wrk_alloc( jpi,jpj, zwx, ekm_dep ) |
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| [3] | 130 | ! ! =============== |
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| 131 | DO jk = 2, jpkm1 ! Horizontal slab |
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| 132 | ! ! =============== |
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| 133 | ! Richardson number (put in zwx(ji,jj)) |
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| 134 | ! ----------------- |
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| 135 | DO jj = 2, jpjm1 |
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| 136 | DO ji = 2, jpim1 |
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| 137 | zcoef = 0.5 / fse3w(ji,jj,jk) |
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| [1601] | 138 | ! ! shear of horizontal velocity |
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| [3] | 139 | zdku = zcoef * ( ub(ji-1,jj,jk-1) + ub(ji,jj,jk-1) & |
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| [1537] | 140 | & -ub(ji-1,jj,jk ) - ub(ji,jj,jk ) ) |
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| [3] | 141 | zdkv = zcoef * ( vb(ji,jj-1,jk-1) + vb(ji,jj,jk-1) & |
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| [1537] | 142 | & -vb(ji,jj-1,jk ) - vb(ji,jj,jk ) ) |
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| [1601] | 143 | ! ! richardson number (minimum value set to zero) |
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| [3] | 144 | zri = rn2(ji,jj,jk) / ( zdku*zdku + zdkv*zdkv + 1.e-20 ) |
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| 145 | zwx(ji,jj) = MAX( zri, 0.e0 ) |
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| 146 | END DO |
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| 147 | END DO |
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| [1601] | 148 | CALL lbc_lnk( zwx, 'W', 1. ) ! Boundary condition (sign unchanged) |
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| [3] | 149 | |
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| 150 | ! Vertical eddy viscosity and diffusivity coefficients |
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| 151 | ! ------------------------------------------------------- |
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| [2715] | 152 | z05alp = 0.5_wp * rn_alp |
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| [1601] | 153 | DO jj = 1, jpjm1 ! Eddy viscosity coefficients (avm) |
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| [3] | 154 | DO ji = 1, jpim1 |
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| [2715] | 155 | avmu(ji,jj,jk) = umask(ji,jj,jk) * rn_avmri / ( 1. + z05alp*( zwx(ji+1,jj)+zwx(ji,jj) ) )**nn_ric |
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| 156 | avmv(ji,jj,jk) = vmask(ji,jj,jk) * rn_avmri / ( 1. + z05alp*( zwx(ji,jj+1)+zwx(ji,jj) ) )**nn_ric |
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| [3] | 157 | END DO |
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| 158 | END DO |
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| [1601] | 159 | DO jj = 2, jpjm1 ! Eddy diffusivity coefficients (avt) |
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| [3] | 160 | DO ji = 2, jpim1 |
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| [2715] | 161 | avt(ji,jj,jk) = tmric(ji,jj,jk) / ( 1._wp + rn_alp * zwx(ji,jj) ) & |
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| 162 | & * ( avmu(ji,jj,jk) + avmu(ji-1,jj,jk) & |
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| 163 | & + avmv(ji,jj,jk) + avmv(ji,jj-1,jk) ) & |
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| [1537] | 164 | & + avtb(jk) * tmask(ji,jj,jk) |
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| [1601] | 165 | ! ! Add the background coefficient on eddy viscosity |
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| [3] | 166 | avmu(ji,jj,jk) = avmu(ji,jj,jk) + avmb(jk) * umask(ji,jj,jk) |
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| 167 | avmv(ji,jj,jk) = avmv(ji,jj,jk) + avmb(jk) * vmask(ji,jj,jk) |
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| 168 | END DO |
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| 169 | END DO |
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| 170 | ! ! =============== |
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| 171 | END DO ! End of slab |
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| 172 | ! ! =============== |
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| [1601] | 173 | ! |
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| [3294] | 174 | IF( ln_mldw ) THEN |
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| 175 | |
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| 176 | ! Compute Ekman depth from wind stress forcing. |
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| 177 | ! ------------------------------------------------------- |
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| 178 | zflageos = ( 0.5 + SIGN( 0.5, nn_eos - 1. ) ) * rau0 |
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| 179 | DO jj = 1, jpj |
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| 180 | DO ji = 1, jpi |
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| 181 | zrhos = rhop(ji,jj,1) + zflageos * ( 1. - tmask(ji,jj,1) ) |
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| 182 | zustar = SQRT( taum(ji,jj) / ( zrhos + rsmall ) ) |
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| 183 | ekm_dep(ji,jj) = rn_ekmfc * zustar / ( ABS( ff(ji,jj) ) + rsmall ) |
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| 184 | ekm_dep(ji,jj) = MAX(ekm_dep(ji,jj),rn_mldmin) ! Minimun allowed |
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| 185 | ekm_dep(ji,jj) = MIN(ekm_dep(ji,jj),rn_mldmax) ! Maximum allowed |
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| 186 | END DO |
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| 187 | END DO |
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| 188 | |
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| 189 | ! In the first model level vertical diff/visc coeff.s |
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| 190 | ! are always equal to the namelist values rn_wtmix/rn_wvmix |
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| 191 | ! ------------------------------------------------------- |
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| 192 | DO jj = 1, jpj |
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| 193 | DO ji = 1, jpi |
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| 194 | avmv(ji,jj,1) = MAX( avmv(ji,jj,1), rn_wvmix ) |
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| 195 | avmu(ji,jj,1) = MAX( avmu(ji,jj,1), rn_wvmix ) |
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| 196 | avt( ji,jj,1) = MAX( avt(ji,jj,1), rn_wtmix ) |
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| 197 | END DO |
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| 198 | END DO |
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| 199 | |
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| 200 | ! Force the vertical mixing coef within the Ekman depth |
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| 201 | ! ------------------------------------------------------- |
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| 202 | DO jk = 2, jpkm1 |
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| 203 | DO jj = 1, jpj |
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| 204 | DO ji = 1, jpi |
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| 205 | IF( fsdept(ji,jj,jk) < ekm_dep(ji,jj) ) THEN |
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| 206 | avmv(ji,jj,jk) = MAX( avmv(ji,jj,jk), rn_wvmix ) |
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| 207 | avmu(ji,jj,jk) = MAX( avmu(ji,jj,jk), rn_wvmix ) |
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| 208 | avt( ji,jj,jk) = MAX( avt(ji,jj,jk), rn_wtmix ) |
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| 209 | ENDIF |
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| 210 | END DO |
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| 211 | END DO |
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| 212 | END DO |
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| 213 | |
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| 214 | DO jk = 1, jpkm1 |
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| 215 | DO jj = 1, jpj |
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| 216 | DO ji = 1, jpi |
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| 217 | avmv(ji,jj,jk) = avmv(ji,jj,jk) * vmask(ji,jj,jk) |
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| 218 | avmu(ji,jj,jk) = avmu(ji,jj,jk) * umask(ji,jj,jk) |
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| 219 | avt( ji,jj,jk) = avt( ji,jj,jk) * tmask(ji,jj,jk) |
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| 220 | END DO |
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| 221 | END DO |
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| 222 | END DO |
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| 223 | |
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| 224 | ENDIF |
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| 225 | |
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| [1601] | 226 | CALL lbc_lnk( avt , 'W', 1. ) ! Boundary conditions (unchanged sign) |
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| 227 | CALL lbc_lnk( avmu, 'U', 1. ) ; CALL lbc_lnk( avmv, 'V', 1. ) |
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| 228 | ! |
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| [3294] | 229 | CALL wrk_dealloc( jpi,jpj, zwx, ekm_dep ) |
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| [2715] | 230 | ! |
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| [3294] | 231 | IF( nn_timing == 1 ) CALL timing_stop('zdf_ric') |
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| 232 | ! |
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| [3] | 233 | END SUBROUTINE zdf_ric |
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| 234 | |
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| 235 | |
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| 236 | SUBROUTINE zdf_ric_init |
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| 237 | !!---------------------------------------------------------------------- |
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| 238 | !! *** ROUTINE zdfbfr_init *** |
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| 239 | !! |
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| 240 | !! ** Purpose : Initialization of the vertical eddy diffusivity and |
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| 241 | !! viscosity coef. for the Richardson number dependent formulation. |
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| 242 | !! |
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| [1601] | 243 | !! ** Method : Read the namzdf_ric namelist and check the parameter values |
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| [3] | 244 | !! |
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| [1601] | 245 | !! ** input : Namelist namzdf_ric |
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| [3] | 246 | !! |
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| 247 | !! ** Action : increase by 1 the nstop flag is setting problem encounter |
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| 248 | !!---------------------------------------------------------------------- |
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| [2715] | 249 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| [4147] | 250 | INTEGER :: ios ! Local integer output status for namelist read |
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| [1537] | 251 | !! |
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| [3294] | 252 | NAMELIST/namzdf_ric/ rn_avmri, rn_alp , nn_ric , rn_ekmfc, & |
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| 253 | & rn_mldmin, rn_mldmax, rn_wtmix, rn_wvmix, ln_mldw |
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| [3] | 254 | !!---------------------------------------------------------------------- |
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| [1601] | 255 | ! |
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| [9366] | 256 | IF(lwm) THEN |
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| 257 | REWIND( numnam_ref ) ! Namelist namzdf_ric in reference namelist : Vertical diffusion Kz depends on Richardson number |
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| 258 | READ ( numnam_ref, namzdf_ric, IOSTAT = ios, ERR = 901) |
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| 259 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_ric in reference namelist', lwm ) |
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| 260 | REWIND( numnam_cfg ) ! Namelist namzdf_ric in configuration namelist : Vertical diffusion Kz depends on Richardson number |
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| 261 | READ ( numnam_cfg, namzdf_ric, IOSTAT = ios, ERR = 902 ) |
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| 262 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namzdf_ric in configuration namelist', lwm ) |
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| 263 | ENDIF |
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| [4147] | 264 | |
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| [4624] | 265 | IF(lwm) WRITE ( numond, namzdf_ric ) |
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| [1601] | 266 | ! |
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| [9366] | 267 | CALL ric_namelist() |
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| 268 | |
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| [1601] | 269 | IF(lwp) THEN ! Control print |
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| [3] | 270 | WRITE(numout,*) |
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| [1537] | 271 | WRITE(numout,*) 'zdf_ric : Ri depend vertical mixing scheme' |
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| 272 | WRITE(numout,*) '~~~~~~~' |
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| [1601] | 273 | WRITE(numout,*) ' Namelist namzdf_ric : set Kz(Ri) parameters' |
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| [3294] | 274 | WRITE(numout,*) ' maximum vertical viscosity rn_avmri = ', rn_avmri |
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| 275 | WRITE(numout,*) ' coefficient rn_alp = ', rn_alp |
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| 276 | WRITE(numout,*) ' coefficient nn_ric = ', nn_ric |
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| 277 | WRITE(numout,*) ' Ekman Factor Coeff rn_ekmfc = ', rn_ekmfc |
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| 278 | WRITE(numout,*) ' minimum mixed layer depth rn_mldmin = ', rn_mldmin |
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| 279 | WRITE(numout,*) ' maximum mixed layer depth rn_mldmax = ', rn_mldmax |
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| 280 | WRITE(numout,*) ' Vertical eddy Diff. in the ML rn_wtmix = ', rn_wtmix |
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| 281 | WRITE(numout,*) ' Vertical eddy Visc. in the ML rn_wvmix = ', rn_wvmix |
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| 282 | WRITE(numout,*) ' Use the MLD parameterization ln_mldw = ', ln_mldw |
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| [3] | 283 | ENDIF |
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| [1601] | 284 | ! |
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| [2715] | 285 | ! ! allocate zdfric arrays |
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| 286 | IF( zdf_ric_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_ric_init : unable to allocate arrays' ) |
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| 287 | ! |
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| 288 | DO jk = 1, jpk ! weighting mean array tmric for 4 T-points |
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| 289 | DO jj = 2, jpj ! which accounts for coastal boundary conditions |
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| [3] | 290 | DO ji = 2, jpi |
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| 291 | tmric(ji,jj,jk) = tmask(ji,jj,jk) & |
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| [1601] | 292 | & / MAX( 1., umask(ji-1,jj ,jk) + umask(ji,jj,jk) & |
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| 293 | & + vmask(ji ,jj-1,jk) + vmask(ji,jj,jk) ) |
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| [3] | 294 | END DO |
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| 295 | END DO |
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| 296 | END DO |
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| [2715] | 297 | tmric(:,1,:) = 0._wp |
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| [1601] | 298 | ! |
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| 299 | DO jk = 1, jpk ! Initialization of vertical eddy coef. to the background value |
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| [3] | 300 | avt (:,:,jk) = avtb(jk) * tmask(:,:,jk) |
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| 301 | avmu(:,:,jk) = avmb(jk) * umask(:,:,jk) |
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| 302 | avmv(:,:,jk) = avmb(jk) * vmask(:,:,jk) |
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| 303 | END DO |
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| [1601] | 304 | ! |
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| [3] | 305 | END SUBROUTINE zdf_ric_init |
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| 306 | |
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| [9366] | 307 | SUBROUTINE ric_namelist() |
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| 308 | !!--------------------------------------------------------------------- |
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| 309 | !! *** ROUTINE ric_namelist *** |
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| 310 | !! |
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| 311 | !! ** Purpose : Broadcast namelist variables read by procesor lwm |
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| 312 | !! |
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| 313 | !! ** Method : use lib_mpp |
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| 314 | !!---------------------------------------------------------------------- |
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| 315 | #if defined key_mpp_mpi |
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| 316 | CALL mpp_bcast(rn_avmri) |
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| 317 | CALL mpp_bcast(rn_alp) |
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| 318 | CALL mpp_bcast(nn_ric) |
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| 319 | CALL mpp_bcast(rn_ekmfc) |
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| 320 | CALL mpp_bcast(rn_mldmin) |
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| 321 | CALL mpp_bcast(rn_mldmax) |
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| 322 | CALL mpp_bcast(rn_wtmix) |
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| 323 | CALL mpp_bcast(rn_wvmix) |
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| 324 | CALL mpp_bcast(ln_mldw) |
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| 325 | #endif |
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| 326 | END SUBROUTINE ric_namelist |
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| [3] | 327 | #else |
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| 328 | !!---------------------------------------------------------------------- |
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| 329 | !! Dummy module : NO Richardson dependent vertical mixing |
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| 330 | !!---------------------------------------------------------------------- |
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| 331 | LOGICAL, PUBLIC, PARAMETER :: lk_zdfric = .FALSE. !: Richardson mixing flag |
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| 332 | CONTAINS |
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| [2528] | 333 | SUBROUTINE zdf_ric_init ! Dummy routine |
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| 334 | END SUBROUTINE zdf_ric_init |
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| [3] | 335 | SUBROUTINE zdf_ric( kt ) ! Dummy routine |
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| [16] | 336 | WRITE(*,*) 'zdf_ric: You should not have seen this print! error?', kt |
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| [3] | 337 | END SUBROUTINE zdf_ric |
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| 338 | #endif |
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| 339 | |
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| 340 | !!====================================================================== |
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| 341 | END MODULE zdfric |
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