[12983] | 1 | MODULE ldfdyn |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE ldfdyn *** |
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| 4 | !! Ocean physics: lateral viscosity coefficient |
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| 5 | !!===================================================================== |
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| 6 | !! History : OPA ! 1997-07 (G. Madec) multi dimensional coefficients |
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| 7 | !! NEMO 1.0 ! 2002-09 (G. Madec) F90: Free form and module |
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| 8 | !! 3.7 ! 2014-01 (F. Lemarie, G. Madec) restructuration/simplification of ahm specification, |
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| 9 | !! ! add velocity dependent coefficient and optional read in file |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! ldf_dyn_init : initialization, namelist read, and parameters control |
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| 14 | !! ldf_dyn : update lateral eddy viscosity coefficients at each time step |
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| 15 | !!---------------------------------------------------------------------- |
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| 16 | USE oce ! ocean dynamics and tracers |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE phycst ! physical constants |
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| 19 | USE ldfslp ! lateral diffusion: slopes of mixing orientation |
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| 20 | USE ldfc1d_c2d ! lateral diffusion: 1D and 2D cases |
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| 21 | ! |
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| 22 | USE in_out_manager ! I/O manager |
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| 23 | USE iom ! I/O module for ehanced bottom friction file |
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| 24 | USE timing ! Timing |
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| 25 | USE lib_mpp ! distribued memory computing library |
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| 26 | USE lbclnk ! ocean lateral boundary conditions (or mpp link) |
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| 27 | |
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| 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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| 31 | PUBLIC ldf_dyn_init ! called by nemogcm.F90 |
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| 32 | PUBLIC ldf_dyn ! called by step.F90 |
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| 33 | |
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| 34 | ! !!* Namelist namdyn_ldf : lateral mixing on momentum * |
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| 35 | LOGICAL , PUBLIC :: ln_dynldf_OFF !: No operator (i.e. no explicit diffusion) |
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| 36 | LOGICAL , PUBLIC :: ln_dynldf_lap !: laplacian operator |
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| 37 | LOGICAL , PUBLIC :: ln_dynldf_blp !: bilaplacian operator |
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| 38 | LOGICAL , PUBLIC :: ln_dynldf_lev !: iso-level direction |
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| 39 | LOGICAL , PUBLIC :: ln_dynldf_hor !: horizontal (geopotential) direction |
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| 40 | ! LOGICAL , PUBLIC :: ln_dynldf_iso !: iso-neutral direction (see ldfslp) |
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| 41 | INTEGER , PUBLIC :: nn_ahm_ijk_t !: choice of time & space variations of the lateral eddy viscosity coef. |
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| 42 | ! ! time invariant coefficients: aht = 1/2 Ud*Ld (lap case) |
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| 43 | ! ! bht = 1/12 Ud*Ld^3 (blp case) |
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| 44 | REAL(wp), PUBLIC :: rn_Uv !: lateral viscous velocity [m/s] |
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| 45 | REAL(wp), PUBLIC :: rn_Lv !: lateral viscous length [m] |
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| 46 | ! ! Smagorinsky viscosity (nn_ahm_ijk_t = 32) |
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| 47 | REAL(wp), PUBLIC :: rn_csmc !: Smagorinsky constant of proportionality |
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| 48 | REAL(wp), PUBLIC :: rn_minfac !: Multiplicative factor of theorectical minimum Smagorinsky viscosity |
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| 49 | REAL(wp), PUBLIC :: rn_maxfac !: Multiplicative factor of theorectical maximum Smagorinsky viscosity |
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| 50 | ! ! iso-neutral laplacian (ln_dynldf_lap=ln_dynldf_iso=T) |
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| 51 | REAL(wp), PUBLIC :: rn_ahm_b !: lateral laplacian background eddy viscosity [m2/s] |
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| 52 | |
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| 53 | ! !!* Parameter to control the type of lateral viscous operator |
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| 54 | INTEGER, PARAMETER, PUBLIC :: np_ERROR =-10 !: error in setting the operator |
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| 55 | INTEGER, PARAMETER, PUBLIC :: np_no_ldf = 00 !: without operator (i.e. no lateral viscous trend) |
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| 56 | ! !! laplacian ! bilaplacian ! |
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| 57 | INTEGER, PARAMETER, PUBLIC :: np_lap = 10 , np_blp = 20 !: iso-level operator |
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| 58 | INTEGER, PARAMETER, PUBLIC :: np_lap_i = 11 !: iso-neutral or geopotential operator |
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| 59 | ! |
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| 60 | INTEGER , PUBLIC :: nldf_dyn !: type of lateral diffusion used defined from ln_dynldf_... (namlist logicals) |
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| 61 | LOGICAL , PUBLIC :: l_ldfdyn_time !: flag for time variation of the lateral eddy viscosity coef. |
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| 62 | |
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| 63 | REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: ahmt, ahmf !: eddy viscosity coef. at T- and F-points [m2/s or m4/s] |
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| 64 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: dtensq !: horizontal tension squared (Smagorinsky only) |
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| 65 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: dshesq !: horizontal shearing strain squared (Smagorinsky only) |
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| 66 | REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: esqt, esqf !: Square of the local gridscale (e1e2/(e1+e2))**2 |
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| 67 | |
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| 68 | REAL(wp) :: r1_2 = 0.5_wp ! =1/2 |
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| 69 | REAL(wp) :: r1_4 = 0.25_wp ! =1/4 |
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| 70 | REAL(wp) :: r1_8 = 0.125_wp ! =1/8 |
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| 71 | REAL(wp) :: r1_12 = 1._wp / 12._wp ! =1/12 |
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| 72 | REAL(wp) :: r1_288 = 1._wp / 288._wp ! =1/( 12^2 * 2 ) |
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| 73 | |
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| 74 | !! * Substitutions |
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| 75 | # include "do_loop_substitute.h90" |
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| 76 | !!---------------------------------------------------------------------- |
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| 77 | !! NEMO/OCE 4.0 , NEMO Consortium (2018) |
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| 78 | !! $Id: ldfdyn.F90 12822 2020-04-28 09:10:38Z gm $ |
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| 79 | !! Software governed by the CeCILL license (see ./LICENSE) |
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| 80 | !!---------------------------------------------------------------------- |
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| 81 | CONTAINS |
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| 82 | |
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| 83 | SUBROUTINE ldf_dyn_init |
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| 84 | !!---------------------------------------------------------------------- |
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| 85 | !! *** ROUTINE ldf_dyn_init *** |
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| 86 | !! |
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| 87 | !! ** Purpose : set the horizontal ocean dynamics physics |
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| 88 | !! |
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| 89 | !! ** Method : the eddy viscosity coef. specification depends on: |
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| 90 | !! - the operator: |
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| 91 | !! ln_dynldf_lap = T laplacian operator |
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| 92 | !! ln_dynldf_blp = T bilaplacian operator |
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| 93 | !! - the parameter nn_ahm_ijk_t: |
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| 94 | !! nn_ahm_ijk_t = 0 => = constant |
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| 95 | !! = 10 => = F(z) : = constant with a reduction of 1/4 with depth |
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| 96 | !! =-20 => = F(i,j) = shape read in 'eddy_viscosity.nc' file |
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| 97 | !! = 20 = F(i,j) = F(e1,e2) or F(e1^3,e2^3) (lap or bilap case) |
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| 98 | !! =-30 => = F(i,j,k) = shape read in 'eddy_viscosity.nc' file |
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| 99 | !! = 30 = F(i,j,k) = 2D (case 20) + decrease with depth (case 10) |
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| 100 | !! = 31 = F(i,j,k,t) = F(local velocity) ( |u|e /12 laplacian operator |
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| 101 | !! or |u|e^3/12 bilaplacian operator ) |
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| 102 | !! = 32 = F(i,j,k,t) = F(local deformation rate and gridscale) (D and L) (Smagorinsky) |
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| 103 | !! ( L^2|D| laplacian operator |
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| 104 | !! or L^4|D|/8 bilaplacian operator ) |
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| 105 | !!---------------------------------------------------------------------- |
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| 106 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 107 | INTEGER :: ioptio, ierr, inum, ios, inn ! local integer |
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| 108 | REAL(wp) :: zah0, zah_max, zUfac ! local scalar |
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| 109 | REAL(wp) :: zsum ! local scalar |
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| 110 | CHARACTER(len=5) :: cl_Units ! units (m2/s or m4/s) |
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| 111 | !! |
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| 112 | NAMELIST/namdyn_ldf/ ln_dynldf_OFF, ln_dynldf_lap, ln_dynldf_blp, & ! type of operator |
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| 113 | & ln_dynldf_lev, ln_dynldf_hor, ln_dynldf_iso, & ! acting direction of the operator |
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| 114 | & nn_ahm_ijk_t , rn_Uv , rn_Lv, rn_ahm_b, & ! lateral eddy coefficient |
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| 115 | & rn_csmc , rn_minfac , rn_maxfac ! Smagorinsky settings |
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| 116 | !!---------------------------------------------------------------------- |
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| 117 | ! |
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| 118 | READ ( numnam_ref, namdyn_ldf, IOSTAT = ios, ERR = 901) |
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| 119 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn_ldf in reference namelist' ) |
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| 120 | |
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| 121 | READ ( numnam_cfg, namdyn_ldf, IOSTAT = ios, ERR = 902 ) |
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| 122 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namdyn_ldf in configuration namelist' ) |
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| 123 | IF(lwm) WRITE ( numond, namdyn_ldf ) |
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| 124 | |
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| 125 | IF(lwp) THEN ! Parameter print |
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| 126 | WRITE(numout,*) |
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| 127 | WRITE(numout,*) 'ldf_dyn : lateral momentum physics' |
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| 128 | WRITE(numout,*) '~~~~~~~' |
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| 129 | WRITE(numout,*) ' Namelist namdyn_ldf : set lateral mixing parameters' |
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| 130 | ! |
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| 131 | WRITE(numout,*) ' type :' |
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| 132 | WRITE(numout,*) ' no explicit diffusion ln_dynldf_OFF = ', ln_dynldf_OFF |
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| 133 | WRITE(numout,*) ' laplacian operator ln_dynldf_lap = ', ln_dynldf_lap |
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| 134 | WRITE(numout,*) ' bilaplacian operator ln_dynldf_blp = ', ln_dynldf_blp |
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| 135 | ! |
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| 136 | WRITE(numout,*) ' direction of action :' |
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| 137 | WRITE(numout,*) ' iso-level ln_dynldf_lev = ', ln_dynldf_lev |
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| 138 | WRITE(numout,*) ' horizontal (geopotential) ln_dynldf_hor = ', ln_dynldf_hor |
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| 139 | WRITE(numout,*) ' iso-neutral ln_dynldf_iso = ', ln_dynldf_iso |
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| 140 | ! |
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| 141 | WRITE(numout,*) ' coefficients :' |
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| 142 | WRITE(numout,*) ' type of time-space variation nn_ahm_ijk_t = ', nn_ahm_ijk_t |
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| 143 | WRITE(numout,*) ' lateral viscous velocity (if cst) rn_Uv = ', rn_Uv, ' m/s' |
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| 144 | WRITE(numout,*) ' lateral viscous length (if cst) rn_Lv = ', rn_Lv, ' m' |
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| 145 | WRITE(numout,*) ' background viscosity (iso-lap case) rn_ahm_b = ', rn_ahm_b, ' m2/s' |
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| 146 | ! |
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| 147 | WRITE(numout,*) ' Smagorinsky settings (nn_ahm_ijk_t = 32) :' |
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| 148 | WRITE(numout,*) ' Smagorinsky coefficient rn_csmc = ', rn_csmc |
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| 149 | WRITE(numout,*) ' factor multiplier for eddy visc.' |
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| 150 | WRITE(numout,*) ' lower limit (default 1.0) rn_minfac = ', rn_minfac |
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| 151 | WRITE(numout,*) ' upper limit (default 1.0) rn_maxfac = ', rn_maxfac |
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| 152 | ENDIF |
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| 153 | |
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| 154 | ! |
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| 155 | ! !== type of lateral operator used ==! (set nldf_dyn) |
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| 156 | ! !=====================================! |
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| 157 | ! |
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| 158 | nldf_dyn = np_ERROR |
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| 159 | ioptio = 0 |
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| 160 | IF( ln_dynldf_OFF ) THEN ; nldf_dyn = np_no_ldf ; ioptio = ioptio + 1 ; ENDIF |
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| 161 | IF( ln_dynldf_lap ) THEN ; ioptio = ioptio + 1 ; ENDIF |
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| 162 | IF( ln_dynldf_blp ) THEN ; ioptio = ioptio + 1 ; ENDIF |
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| 163 | IF( ioptio /= 1 ) CALL ctl_stop( 'dyn_ldf_init: use ONE of the 3 operator options (NONE/lap/blp)' ) |
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| 164 | ! |
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| 165 | IF(.NOT.ln_dynldf_OFF ) THEN !== direction ==>> type of operator ==! |
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| 166 | ioptio = 0 |
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| 167 | IF( ln_dynldf_lev ) ioptio = ioptio + 1 |
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| 168 | IF( ln_dynldf_hor ) ioptio = ioptio + 1 |
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| 169 | IF( ln_dynldf_iso ) ioptio = ioptio + 1 |
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| 170 | IF( ioptio /= 1 ) CALL ctl_stop( 'dyn_ldf_init: use ONE of the 3 direction options (level/hor/iso)' ) |
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| 171 | ! |
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| 172 | ! ! Set nldf_dyn, the type of lateral diffusion, from ln_dynldf_... logicals |
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| 173 | ierr = 0 |
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| 174 | IF( ln_dynldf_lap ) THEN ! laplacian operator |
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| 175 | IF( ln_zco ) THEN ! z-coordinate |
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| 176 | IF ( ln_dynldf_lev ) nldf_dyn = np_lap ! iso-level = horizontal (no rotation) |
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| 177 | IF ( ln_dynldf_hor ) nldf_dyn = np_lap ! iso-level = horizontal (no rotation) |
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| 178 | IF ( ln_dynldf_iso ) nldf_dyn = np_lap_i ! iso-neutral ( rotation) |
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| 179 | ENDIF |
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| 180 | IF( ln_zps ) THEN ! z-coordinate with partial step |
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| 181 | IF ( ln_dynldf_lev ) nldf_dyn = np_lap ! iso-level (no rotation) |
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| 182 | IF ( ln_dynldf_hor ) nldf_dyn = np_lap ! iso-level (no rotation) |
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| 183 | IF ( ln_dynldf_iso ) nldf_dyn = np_lap_i ! iso-neutral ( rotation) |
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| 184 | ENDIF |
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| 185 | IF( ln_sco ) THEN ! s-coordinate |
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| 186 | IF ( ln_dynldf_lev ) nldf_dyn = np_lap ! iso-level = horizontal (no rotation) |
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| 187 | IF ( ln_dynldf_hor ) nldf_dyn = np_lap_i ! horizontal ( rotation) |
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| 188 | IF ( ln_dynldf_iso ) nldf_dyn = np_lap_i ! iso-neutral ( rotation) |
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| 189 | ENDIF |
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| 190 | ENDIF |
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| 191 | ! |
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| 192 | IF( ln_dynldf_blp ) THEN ! bilaplacian operator |
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| 193 | IF( ln_zco ) THEN ! z-coordinate |
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| 194 | IF( ln_dynldf_lev ) nldf_dyn = np_blp ! iso-level = horizontal (no rotation) |
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| 195 | IF( ln_dynldf_hor ) nldf_dyn = np_blp ! iso-level = horizontal (no rotation) |
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| 196 | IF( ln_dynldf_iso ) ierr = 2 ! iso-neutral ( rotation) |
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| 197 | ENDIF |
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| 198 | IF( ln_zps ) THEN ! z-coordinate with partial step |
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| 199 | IF( ln_dynldf_lev ) nldf_dyn = np_blp ! iso-level (no rotation) |
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| 200 | IF( ln_dynldf_hor ) nldf_dyn = np_blp ! iso-level (no rotation) |
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| 201 | IF( ln_dynldf_iso ) ierr = 2 ! iso-neutral ( rotation) |
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| 202 | ENDIF |
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| 203 | IF( ln_sco ) THEN ! s-coordinate |
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| 204 | IF( ln_dynldf_lev ) nldf_dyn = np_blp ! iso-level (no rotation) |
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| 205 | IF( ln_dynldf_hor ) ierr = 2 ! horizontal ( rotation) |
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| 206 | IF( ln_dynldf_iso ) ierr = 2 ! iso-neutral ( rotation) |
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| 207 | ENDIF |
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| 208 | ENDIF |
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| 209 | ! |
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| 210 | IF( ierr == 2 ) CALL ctl_stop( 'rotated bi-laplacian operator does not exist' ) |
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| 211 | ! |
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| 212 | IF( nldf_dyn == np_lap_i ) l_ldfslp = .TRUE. ! rotation require the computation of the slopes |
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| 213 | ! |
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| 214 | ENDIF |
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| 215 | ! |
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| 216 | IF(lwp) THEN |
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| 217 | WRITE(numout,*) |
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| 218 | SELECT CASE( nldf_dyn ) |
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| 219 | CASE( np_no_ldf ) ; WRITE(numout,*) ' ==>>> NO lateral viscosity' |
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| 220 | CASE( np_lap ) ; WRITE(numout,*) ' ==>>> iso-level laplacian operator' |
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| 221 | CASE( np_lap_i ) ; WRITE(numout,*) ' ==>>> rotated laplacian operator with iso-level background' |
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| 222 | CASE( np_blp ) ; WRITE(numout,*) ' ==>>> iso-level bi-laplacian operator' |
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| 223 | END SELECT |
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| 224 | WRITE(numout,*) |
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| 225 | ENDIF |
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| 226 | |
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| 227 | ! |
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| 228 | ! !== Space/time variation of eddy coefficients ==! |
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| 229 | ! !=================================================! |
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| 230 | ! |
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| 231 | l_ldfdyn_time = .FALSE. ! no time variation except in case defined below |
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| 232 | ! |
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| 233 | IF( ln_dynldf_OFF ) THEN |
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| 234 | IF(lwp) WRITE(numout,*) ' ==>>> No viscous operator selected. ahmt and ahmf are not allocated' |
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| 235 | RETURN |
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| 236 | ! |
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| 237 | ELSE !== a lateral diffusion operator is used ==! |
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| 238 | ! |
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| 239 | ! ! allocate the ahm arrays |
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| 240 | ALLOCATE( ahmt(jpi,jpj,jpk) , ahmf(jpi,jpj,jpk) , STAT=ierr ) |
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| 241 | IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'ldf_dyn_init: failed to allocate arrays') |
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| 242 | ! |
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| 243 | ahmt(:,:,:) = 0._wp ! init to 0 needed |
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| 244 | ahmf(:,:,:) = 0._wp |
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| 245 | ! |
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| 246 | ! ! value of lap/blp eddy mixing coef. |
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| 247 | IF( ln_dynldf_lap ) THEN ; zUfac = r1_2 *rn_Uv ; inn = 1 ; cl_Units = ' m2/s' ! laplacian |
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| 248 | ELSEIF( ln_dynldf_blp ) THEN ; zUfac = r1_12*rn_Uv ; inn = 3 ; cl_Units = ' m4/s' ! bilaplacian |
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| 249 | ENDIF |
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| 250 | zah0 = zUfac * rn_Lv**inn ! mixing coefficient |
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| 251 | zah_max = zUfac * (ra*rad)**inn ! maximum reachable coefficient (value at the Equator) |
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| 252 | ! |
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| 253 | SELECT CASE( nn_ahm_ijk_t ) !* Specification of space-time variations of ahmt, ahmf |
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| 254 | ! |
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| 255 | CASE( 0 ) !== constant ==! |
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| 256 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity. = constant = ', zah0, cl_Units |
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| 257 | ahmt(:,:,1:jpkm1) = zah0 |
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| 258 | ahmf(:,:,1:jpkm1) = zah0 |
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| 259 | ! |
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| 260 | CASE( 10 ) !== fixed profile ==! |
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| 261 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F( depth )' |
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| 262 | IF(lwp) WRITE(numout,*) ' surface viscous coef. = constant = ', zah0, cl_Units |
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| 263 | ahmt(:,:,1) = zah0 ! constant surface value |
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| 264 | ahmf(:,:,1) = zah0 |
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| 265 | CALL ldf_c1d( 'DYN', ahmt(:,:,1), ahmf(:,:,1), ahmt, ahmf ) |
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| 266 | ! |
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| 267 | CASE ( -20 ) !== fixed horizontal shape read in file ==! |
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| 268 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F(i,j) read in eddy_viscosity.nc file' |
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| 269 | CALL iom_open( 'eddy_viscosity_2D.nc', inum ) |
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| 270 | CALL iom_get ( inum, jpdom_data, 'ahmt_2d', ahmt(:,:,1) ) |
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| 271 | CALL iom_get ( inum, jpdom_data, 'ahmf_2d', ahmf(:,:,1) ) |
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| 272 | CALL iom_close( inum ) |
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| 273 | DO jk = 2, jpkm1 |
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| 274 | ahmt(:,:,jk) = ahmt(:,:,1) |
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| 275 | ahmf(:,:,jk) = ahmf(:,:,1) |
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| 276 | END DO |
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| 277 | ! |
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| 278 | CASE( 20 ) !== fixed horizontal shape ==! |
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| 279 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F( e1, e2 ) or F( e1^3, e2^3 ) (lap. or blp. case)' |
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| 280 | IF(lwp) WRITE(numout,*) ' using a fixed viscous velocity = ', rn_Uv ,' m/s and Lv = Max(e1,e2)' |
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| 281 | IF(lwp) WRITE(numout,*) ' maximum reachable coefficient (at the Equator) = ', zah_max, cl_Units, ' for e1=1°)' |
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| 282 | CALL ldf_c2d( 'DYN', zUfac , inn , ahmt, ahmf ) ! surface value proportional to scale factor^inn |
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| 283 | ! |
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| 284 | CASE( -30 ) !== fixed 3D shape read in file ==! |
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| 285 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F(i,j,k) read in eddy_viscosity_3D.nc file' |
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| 286 | CALL iom_open( 'eddy_viscosity_3D.nc', inum ) |
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| 287 | CALL iom_get ( inum, jpdom_data, 'ahmt_3d', ahmt ) |
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| 288 | CALL iom_get ( inum, jpdom_data, 'ahmf_3d', ahmf ) |
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| 289 | CALL iom_close( inum ) |
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| 290 | ! |
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| 291 | CASE( 30 ) !== fixed 3D shape ==! |
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| 292 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F( latitude, longitude, depth )' |
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| 293 | IF(lwp) WRITE(numout,*) ' using a fixed viscous velocity = ', rn_Uv ,' m/s and Ld = Max(e1,e2)' |
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| 294 | IF(lwp) WRITE(numout,*) ' maximum reachable coefficient (at the Equator) = ', zah_max, cl_Units, ' for e1=1°)' |
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| 295 | CALL ldf_c2d( 'DYN', zUfac , inn , ahmt, ahmf ) ! surface value proportional to scale factor^inn |
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| 296 | CALL ldf_c1d( 'DYN', ahmt(:,:,1), ahmf(:,:,1), ahmt, ahmf ) ! reduction with depth |
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| 297 | ! |
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| 298 | CASE( 31 ) !== time varying 3D field ==! |
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| 299 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F( latitude, longitude, depth , time )' |
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| 300 | IF(lwp) WRITE(numout,*) ' proportional to the local velocity : 1/2 |u|e (lap) or 1/12 |u|e^3 (blp)' |
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| 301 | ! |
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| 302 | l_ldfdyn_time = .TRUE. ! will be calculated by call to ldf_dyn routine in step.F90 |
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| 303 | ! |
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| 304 | CASE( 32 ) !== time varying 3D field ==! |
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| 305 | IF(lwp) WRITE(numout,*) ' ==>>> eddy viscosity = F( latitude, longitude, depth , time )' |
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| 306 | IF(lwp) WRITE(numout,*) ' proportional to the local deformation rate and gridscale (Smagorinsky)' |
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| 307 | ! |
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| 308 | l_ldfdyn_time = .TRUE. ! will be calculated by call to ldf_dyn routine in step.F90 |
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| 309 | ! |
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| 310 | ! ! allocate arrays used in ldf_dyn. |
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| 311 | ALLOCATE( dtensq(jpi,jpj,jpk) , dshesq(jpi,jpj,jpk) , esqt(jpi,jpj) , esqf(jpi,jpj) , STAT=ierr ) |
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| 312 | IF( ierr /= 0 ) CALL ctl_stop( 'STOP', 'ldf_dyn_init: failed to allocate Smagorinsky arrays') |
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| 313 | ! |
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| 314 | DO_2D_11_11 |
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| 315 | esqt(ji,jj) = ( 2._wp * e1e2t(ji,jj) / ( e1t(ji,jj) + e2t(ji,jj) ) )**2 |
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| 316 | esqf(ji,jj) = ( 2._wp * e1e2f(ji,jj) / ( e1f(ji,jj) + e2f(ji,jj) ) )**2 |
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| 317 | END_2D |
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| 318 | ! |
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| 319 | CASE DEFAULT |
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| 320 | CALL ctl_stop('ldf_dyn_init: wrong choice for nn_ahm_ijk_t, the type of space-time variation of ahm') |
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| 321 | END SELECT |
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| 322 | ! |
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| 323 | IF( .NOT.l_ldfdyn_time ) THEN !* No time variation |
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| 324 | IF( ln_dynldf_lap ) THEN ! laplacian operator (mask only) |
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| 325 | ahmt(:,:,1:jpkm1) = ahmt(:,:,1:jpkm1) * tmask(:,:,1:jpkm1) |
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| 326 | WRITE(numout,*) ' ahmt tmask ' |
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| 327 | !! mask tension at the coast (equivalent of ghostpoints at T) |
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| 328 | ! DO jk = 1, jpk |
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| 329 | ! DO jj = 1, jpjm1 |
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| 330 | ! DO ji = 1, jpim1 ! NO vector opt. |
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| 331 | ! ! si sum(fmask)==3 = mouillé (on touche pas) |
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| 332 | ! ! si sum = 2 alors on met a 0 zsum = fmask + fmask + fmask,.. et si zsum < 2 -> 0 sinon = 1 |
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| 333 | ! zsum = fmask(ji,jj ,jk) + fmask(ji+1,jj ,jk) & |
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| 334 | ! & + fmask(ji,jj+1,jk) + fmask(ji+1,jj+1,jk) |
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| 335 | ! IF ( zsum < 2._wp ) ahmt(ji,jj,jk) = 0 |
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| 336 | ! ! |
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| 337 | ! !ahmt(ji,jj,jk) = ahmt(ji,jj,jk) * fmask(ji,jj ,jk) * fmask(ji+1,jj ,jk) & |
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| 338 | ! ! & * fmask(ji,jj+1,jk) * fmask(ji+1,jj+1,jk) |
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| 339 | ! END DO |
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| 340 | ! END DO |
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| 341 | ! END DO |
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| 342 | ! ahmt(jpi,:,1:jpkm1) = 0._wp |
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| 343 | ! ahmt(:,jpj,1:jpkm1) = 0._wp |
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| 344 | ! WRITE(numout,*) ' an45 ahmt x0' |
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| 345 | |
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| 346 | ahmf(:,:,1:jpkm1) = ahmf(:,:,1:jpkm1) * fmask(:,:,1:jpkm1) |
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| 347 | WRITE(numout,*) ' ahmf fmask ' |
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| 348 | !!an apply no slip at the coast (ssfmask = 1 within the domain and at the coast contrary to fmask in free slip) |
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| 349 | ! DO jk = 1, jpkm1 |
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| 350 | ! ahmf(:,:,jk) = ahmf(:,:,jk) * ( 2._wp * ssfmask(:,:) - fmask(:,:,jk) ) |
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| 351 | ! END DO |
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| 352 | ! WRITE(numout,*) ' an45 ahmf x2' |
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| 353 | |
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| 354 | ELSEIF( ln_dynldf_blp ) THEN ! bilaplacian operator (square root + mask) |
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| 355 | ahmt(:,:,1:jpkm1) = SQRT( ahmt(:,:,1:jpkm1) ) * tmask(:,:,1:jpkm1) |
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| 356 | ahmf(:,:,1:jpkm1) = SQRT( ahmf(:,:,1:jpkm1) ) * fmask(:,:,1:jpkm1) |
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| 357 | ENDIF |
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| 358 | ENDIF |
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| 359 | ! |
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| 360 | ENDIF |
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| 361 | ! |
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| 362 | END SUBROUTINE ldf_dyn_init |
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| 363 | |
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| 364 | |
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| 365 | SUBROUTINE ldf_dyn( kt, Kbb ) |
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| 366 | !!---------------------------------------------------------------------- |
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| 367 | !! *** ROUTINE ldf_dyn *** |
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| 368 | !! |
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| 369 | !! ** Purpose : update at kt the momentum lateral mixing coeff. (ahmt and ahmf) |
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| 370 | !! |
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| 371 | !! ** Method : time varying eddy viscosity coefficients: |
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| 372 | !! |
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| 373 | !! nn_ahm_ijk_t = 31 ahmt, ahmf = F(i,j,k,t) = F(local velocity) |
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| 374 | !! ( |u|e /12 or |u|e^3/12 for laplacian or bilaplacian operator ) |
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| 375 | !! |
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| 376 | !! nn_ahm_ijk_t = 32 ahmt, ahmf = F(i,j,k,t) = F(local deformation rate and gridscale) (D and L) (Smagorinsky) |
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| 377 | !! ( L^2|D| or L^4|D|/8 for laplacian or bilaplacian operator ) |
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| 378 | !! |
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| 379 | !! ** note : in BLP cases the sqrt of the eddy coef is returned, since bilaplacian is en re-entrant laplacian |
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| 380 | !! ** action : ahmt, ahmf updated at each time step |
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| 381 | !!---------------------------------------------------------------------- |
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| 382 | INTEGER, INTENT(in) :: kt ! time step index |
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| 383 | INTEGER, INTENT(in) :: Kbb ! ocean time level indices |
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| 384 | ! |
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| 385 | INTEGER :: ji, jj, jk ! dummy loop indices |
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| 386 | REAL(wp) :: zu2pv2_ij_p1, zu2pv2_ij, zu2pv2_ij_m1, zemax ! local scalar (option 31) |
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| 387 | REAL(wp) :: zcmsmag, zstabf_lo, zstabf_up, zdelta, zdb ! local scalar (option 32) |
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| 388 | !!---------------------------------------------------------------------- |
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| 389 | ! |
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| 390 | IF( ln_timing ) CALL timing_start('ldf_dyn') |
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| 391 | ! |
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| 392 | SELECT CASE( nn_ahm_ijk_t ) !== Eddy vicosity coefficients ==! |
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| 393 | ! |
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| 394 | CASE( 31 ) !== time varying 3D field ==! = F( local velocity ) |
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| 395 | ! |
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| 396 | IF( ln_dynldf_lap ) THEN ! laplacian operator : |u| e /12 = |u/144| e |
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| 397 | DO jk = 1, jpkm1 |
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| 398 | DO_2D_00_00 |
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| 399 | zu2pv2_ij = uu(ji ,jj ,jk,Kbb) * uu(ji ,jj ,jk,Kbb) + vv(ji ,jj ,jk,Kbb) * vv(ji ,jj ,jk,Kbb) |
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| 400 | zu2pv2_ij_m1 = uu(ji-1,jj ,jk,Kbb) * uu(ji-1,jj ,jk,Kbb) + vv(ji ,jj-1,jk,Kbb) * vv(ji ,jj-1,jk,Kbb) |
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| 401 | zemax = MAX( e1t(ji,jj) , e2t(ji,jj) ) |
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| 402 | ahmt(ji,jj,jk) = SQRT( (zu2pv2_ij + zu2pv2_ij_m1) * r1_288 ) * zemax * tmask(ji,jj,jk) ! 288= 12*12 * 2 |
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| 403 | END_2D |
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| 404 | DO_2D_10_10 |
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| 405 | zu2pv2_ij_p1 = uu(ji ,jj+1,jk, Kbb) * uu(ji ,jj+1,jk, Kbb) + vv(ji+1,jj ,jk, Kbb) * vv(ji+1,jj ,jk, Kbb) |
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| 406 | zu2pv2_ij = uu(ji ,jj ,jk, Kbb) * uu(ji ,jj ,jk, Kbb) + vv(ji ,jj ,jk, Kbb) * vv(ji ,jj ,jk, Kbb) |
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| 407 | zemax = MAX( e1f(ji,jj) , e2f(ji,jj) ) |
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| 408 | ahmf(ji,jj,jk) = SQRT( (zu2pv2_ij + zu2pv2_ij_p1) * r1_288 ) * zemax * fmask(ji,jj,jk) ! 288= 12*12 * 2 |
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| 409 | END_2D |
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| 410 | END DO |
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| 411 | ELSEIF( ln_dynldf_blp ) THEN ! bilaplacian operator : sqrt( |u| e^3 /12 ) = sqrt( |u/144| e ) * e |
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| 412 | DO jk = 1, jpkm1 |
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| 413 | DO_2D_00_00 |
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| 414 | zu2pv2_ij = uu(ji ,jj ,jk,Kbb) * uu(ji ,jj ,jk,Kbb) + vv(ji ,jj ,jk,Kbb) * vv(ji ,jj ,jk,Kbb) |
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| 415 | zu2pv2_ij_m1 = uu(ji-1,jj ,jk,Kbb) * uu(ji-1,jj ,jk,Kbb) + vv(ji ,jj-1,jk,Kbb) * vv(ji ,jj-1,jk,Kbb) |
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| 416 | zemax = MAX( e1t(ji,jj) , e2t(ji,jj) ) |
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| 417 | ahmt(ji,jj,jk) = SQRT( SQRT( (zu2pv2_ij + zu2pv2_ij_m1) * r1_288 ) * zemax ) * zemax * tmask(ji,jj,jk) |
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| 418 | END_2D |
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| 419 | DO_2D_10_10 |
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| 420 | zu2pv2_ij_p1 = uu(ji ,jj+1,jk, Kbb) * uu(ji ,jj+1,jk, Kbb) + vv(ji+1,jj ,jk, Kbb) * vv(ji+1,jj ,jk, Kbb) |
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| 421 | zu2pv2_ij = uu(ji ,jj ,jk, Kbb) * uu(ji ,jj ,jk, Kbb) + vv(ji ,jj ,jk, Kbb) * vv(ji ,jj ,jk, Kbb) |
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| 422 | zemax = MAX( e1f(ji,jj) , e2f(ji,jj) ) |
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| 423 | ahmf(ji,jj,jk) = SQRT( SQRT( (zu2pv2_ij + zu2pv2_ij_p1) * r1_288 ) * zemax ) * zemax * fmask(ji,jj,jk) |
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| 424 | END_2D |
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| 425 | END DO |
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| 426 | ENDIF |
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| 427 | ! |
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| 428 | CALL lbc_lnk_multi( 'ldfdyn', ahmt, 'T', 1., ahmf, 'F', 1. ) |
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| 429 | ! |
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| 430 | ! |
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| 431 | CASE( 32 ) !== time varying 3D field ==! = F( local deformation rate and gridscale ) (Smagorinsky) |
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| 432 | ! |
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| 433 | IF( ln_dynldf_lap .OR. ln_dynldf_blp ) THEN ! laplacian operator : (C_smag/pi)^2 L^2 |D| |
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| 434 | ! |
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| 435 | zcmsmag = (rn_csmc/rpi)**2 ! (C_smag/pi)^2 |
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| 436 | zstabf_lo = rn_minfac * rn_minfac / ( 2._wp * 12._wp * 12._wp * zcmsmag ) ! lower limit stability factor scaling |
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| 437 | zstabf_up = rn_maxfac / ( 4._wp * zcmsmag * 2._wp * rn_Dt ) ! upper limit stability factor scaling |
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| 438 | IF( ln_dynldf_blp ) zstabf_lo = ( 16._wp / 9._wp ) * zstabf_lo ! provide |U|L^3/12 lower limit instead |
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| 439 | ! ! of |U|L^3/16 in blp case |
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| 440 | DO jk = 1, jpkm1 |
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| 441 | ! |
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| 442 | DO_2D_00_00 |
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| 443 | zdb = ( uu(ji,jj,jk,Kbb) * r1_e2u(ji,jj) - uu(ji-1,jj,jk,Kbb) * r1_e2u(ji-1,jj) ) & |
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| 444 | & * r1_e1t(ji,jj) * e2t(ji,jj) & |
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| 445 | & - ( vv(ji,jj,jk,Kbb) * r1_e1v(ji,jj) - vv(ji,jj-1,jk,Kbb) * r1_e1v(ji,jj-1) ) & |
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| 446 | & * r1_e2t(ji,jj) * e1t(ji,jj) |
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| 447 | dtensq(ji,jj,jk) = zdb * zdb * tmask(ji,jj,jk) |
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| 448 | END_2D |
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| 449 | ! |
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| 450 | DO_2D_10_10 |
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| 451 | zdb = ( uu(ji,jj+1,jk,Kbb) * r1_e1u(ji,jj+1) - uu(ji,jj,jk,Kbb) * r1_e1u(ji,jj) ) & |
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| 452 | & * r1_e2f(ji,jj) * e1f(ji,jj) & |
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| 453 | & + ( vv(ji+1,jj,jk,Kbb) * r1_e2v(ji+1,jj) - vv(ji,jj,jk,Kbb) * r1_e2v(ji,jj) ) & |
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| 454 | & * r1_e1f(ji,jj) * e2f(ji,jj) |
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| 455 | dshesq(ji,jj,jk) = zdb * zdb * fmask(ji,jj,jk) |
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| 456 | END_2D |
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| 457 | ! |
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| 458 | END DO |
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| 459 | ! |
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| 460 | CALL lbc_lnk_multi( 'ldfdyn', dtensq, 'T', 1. ) ! lbc_lnk on dshesq not needed |
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| 461 | ! |
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| 462 | DO jk = 1, jpkm1 |
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| 463 | ! |
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| 464 | DO_2D_00_00 |
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| 465 | ! |
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| 466 | zu2pv2_ij = uu(ji ,jj ,jk,Kbb) * uu(ji ,jj ,jk,Kbb) + vv(ji ,jj ,jk,Kbb) * vv(ji ,jj ,jk,Kbb) |
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| 467 | zu2pv2_ij_m1 = uu(ji-1,jj ,jk,Kbb) * uu(ji-1,jj ,jk,Kbb) + vv(ji ,jj-1,jk,Kbb) * vv(ji ,jj-1,jk,Kbb) |
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| 468 | ! |
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| 469 | zdelta = zcmsmag * esqt(ji,jj) ! L^2 * (C_smag/pi)^2 |
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| 470 | ahmt(ji,jj,jk) = zdelta * SQRT( dtensq(ji ,jj,jk) + & |
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| 471 | & r1_4 * ( dshesq(ji ,jj,jk) + dshesq(ji ,jj-1,jk) + & |
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| 472 | & dshesq(ji-1,jj,jk) + dshesq(ji-1,jj-1,jk) ) ) |
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| 473 | ahmt(ji,jj,jk) = MAX( ahmt(ji,jj,jk), SQRT( (zu2pv2_ij + zu2pv2_ij_m1) * zdelta * zstabf_lo ) ) ! Impose lower limit == minfac * |U|L/2 |
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| 474 | ahmt(ji,jj,jk) = MIN( ahmt(ji,jj,jk), zdelta * zstabf_up ) ! Impose upper limit == maxfac * L^2/(4*2dt) |
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| 475 | ! |
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| 476 | END_2D |
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| 477 | ! |
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| 478 | DO_2D_10_10 |
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| 479 | ! |
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| 480 | zu2pv2_ij_p1 = uu(ji ,jj+1,jk, kbb) * uu(ji ,jj+1,jk, kbb) + vv(ji+1,jj ,jk, kbb) * vv(ji+1,jj ,jk, kbb) |
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| 481 | zu2pv2_ij = uu(ji ,jj ,jk, kbb) * uu(ji ,jj ,jk, kbb) + vv(ji ,jj ,jk, kbb) * vv(ji ,jj ,jk, kbb) |
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| 482 | ! |
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| 483 | zdelta = zcmsmag * esqf(ji,jj) ! L^2 * (C_smag/pi)^2 |
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| 484 | ahmf(ji,jj,jk) = zdelta * SQRT( dshesq(ji ,jj,jk) + & |
---|
| 485 | & r1_4 * ( dtensq(ji ,jj,jk) + dtensq(ji ,jj+1,jk) + & |
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| 486 | & dtensq(ji+1,jj,jk) + dtensq(ji+1,jj+1,jk) ) ) |
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| 487 | ahmf(ji,jj,jk) = MAX( ahmf(ji,jj,jk), SQRT( (zu2pv2_ij + zu2pv2_ij_p1) * zdelta * zstabf_lo ) ) ! Impose lower limit == minfac * |U|L/2 |
---|
| 488 | ahmf(ji,jj,jk) = MIN( ahmf(ji,jj,jk), zdelta * zstabf_up ) ! Impose upper limit == maxfac * L^2/(4*2dt) |
---|
| 489 | ! |
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| 490 | END_2D |
---|
| 491 | ! |
---|
| 492 | END DO |
---|
| 493 | ! |
---|
| 494 | ENDIF |
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| 495 | ! |
---|
| 496 | IF( ln_dynldf_blp ) THEN ! bilaplacian operator : sqrt( (C_smag/pi)^2 L^4 |D|/8) |
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| 497 | ! ! = sqrt( A_lap_smag L^2/8 ) |
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| 498 | ! ! stability limits already applied to laplacian values |
---|
| 499 | ! ! effective default limits are 1/12 |U|L^3 < B_hm < 1//(32*2dt) L^4 |
---|
| 500 | DO jk = 1, jpkm1 |
---|
| 501 | DO_2D_00_00 |
---|
| 502 | ahmt(ji,jj,jk) = SQRT( r1_8 * esqt(ji,jj) * ahmt(ji,jj,jk) ) |
---|
| 503 | END_2D |
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| 504 | DO_2D_10_10 |
---|
| 505 | ahmf(ji,jj,jk) = SQRT( r1_8 * esqf(ji,jj) * ahmf(ji,jj,jk) ) |
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| 506 | END_2D |
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| 507 | END DO |
---|
| 508 | ! |
---|
| 509 | ENDIF |
---|
| 510 | ! |
---|
| 511 | CALL lbc_lnk_multi( 'ldfdyn', ahmt, 'T', 1. , ahmf, 'F', 1. ) |
---|
| 512 | ! |
---|
| 513 | END SELECT |
---|
| 514 | ! |
---|
| 515 | CALL iom_put( "ahmt_2d", ahmt(:,:,1) ) ! surface u-eddy diffusivity coeff. |
---|
| 516 | CALL iom_put( "ahmf_2d", ahmf(:,:,1) ) ! surface v-eddy diffusivity coeff. |
---|
| 517 | CALL iom_put( "ahmt_3d", ahmt(:,:,:) ) ! 3D u-eddy diffusivity coeff. |
---|
| 518 | CALL iom_put( "ahmf_3d", ahmf(:,:,:) ) ! 3D v-eddy diffusivity coeff. |
---|
| 519 | ! |
---|
| 520 | IF( ln_timing ) CALL timing_stop('ldf_dyn') |
---|
| 521 | ! |
---|
| 522 | END SUBROUTINE ldf_dyn |
---|
| 523 | |
---|
| 524 | !!====================================================================== |
---|
| 525 | END MODULE ldfdyn |
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