[8586] | 1 | MODULE icedyn |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE icedyn *** |
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[14072] | 4 | !! Sea-Ice dynamics : master routine for sea ice dynamics |
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[8586] | 5 | !!====================================================================== |
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[9604] | 6 | !! history : 4.0 ! 2018 (C. Rousset) original code SI3 [aka Sea Ice cube] |
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[8586] | 7 | !!---------------------------------------------------------------------- |
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[9570] | 8 | #if defined key_si3 |
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[8586] | 9 | !!---------------------------------------------------------------------- |
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[9570] | 10 | !! 'key_si3' SI3 sea-ice model |
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[8586] | 11 | !!---------------------------------------------------------------------- |
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| 12 | !! ice_dyn : dynamics of sea ice |
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| 13 | !! ice_dyn_init : initialization and namelist read |
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| 14 | !!---------------------------------------------------------------------- |
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| 15 | USE phycst ! physical constants |
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| 16 | USE dom_oce ! ocean space and time domain |
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| 17 | USE ice ! sea-ice: variables |
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| 18 | USE icedyn_rhg ! sea-ice: rheology |
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| 19 | USE icedyn_adv ! sea-ice: advection |
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| 20 | USE icedyn_rdgrft ! sea-ice: ridging/rafting |
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| 21 | USE icecor ! sea-ice: corrections |
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| 22 | USE icevar ! sea-ice: operations |
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[10413] | 23 | USE icectl ! sea-ice: control prints |
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[8586] | 24 | ! |
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| 25 | USE in_out_manager ! I/O manager |
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| 26 | USE iom ! I/O manager library |
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| 27 | USE lib_mpp ! MPP library |
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| 28 | USE lib_fortran ! fortran utilities (glob_sum + no signed zero) |
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| 29 | USE lbclnk ! lateral boundary conditions (or mpp links) |
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| 30 | USE timing ! Timing |
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[14005] | 31 | USE fldread ! read input fields |
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[8586] | 32 | |
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| 33 | IMPLICIT NONE |
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| 34 | PRIVATE |
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| 35 | |
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| 36 | PUBLIC ice_dyn ! called by icestp.F90 |
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| 37 | PUBLIC ice_dyn_init ! called by icestp.F90 |
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[14072] | 38 | |
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[8586] | 39 | INTEGER :: nice_dyn ! choice of the type of dynamics |
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| 40 | ! ! associated indices: |
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[10413] | 41 | INTEGER, PARAMETER :: np_dynALL = 1 ! full ice dynamics (rheology + advection + ridging/rafting + correction) |
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[14072] | 42 | INTEGER, PARAMETER :: np_dynRHGADV = 2 ! pure dynamics (rheology + advection) |
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[10413] | 43 | INTEGER, PARAMETER :: np_dynADV1D = 3 ! only advection 1D - test case from Schar & Smolarkiewicz 1996 |
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| 44 | INTEGER, PARAMETER :: np_dynADV2D = 4 ! only advection 2D w prescribed vel.(rn_uvice + advection) |
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[8586] | 45 | ! |
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| 46 | ! ** namelist (namdyn) ** |
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[10413] | 47 | LOGICAL :: ln_dynALL ! full ice dynamics (rheology + advection + ridging/rafting + correction) |
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| 48 | LOGICAL :: ln_dynRHGADV ! no ridge/raft & no corrections (rheology + advection) |
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| 49 | LOGICAL :: ln_dynADV1D ! only advection in 1D w ice convergence (test case from Schar & Smolarkiewicz 1996) |
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| 50 | LOGICAL :: ln_dynADV2D ! only advection in 2D w prescribed vel. (rn_uvice + advection) |
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| 51 | REAL(wp) :: rn_uice ! prescribed u-vel (case np_dynADV1D & np_dynADV2D) |
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| 52 | REAL(wp) :: rn_vice ! prescribed v-vel (case np_dynADV1D & np_dynADV2D) |
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[14072] | 53 | |
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[14005] | 54 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_icbmsk ! structure of input grounded icebergs mask (file informations, fields read) |
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| 55 | |
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[8586] | 56 | !! * Substitutions |
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[12377] | 57 | # include "do_loop_substitute.h90" |
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[8586] | 58 | !!---------------------------------------------------------------------- |
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[9598] | 59 | !! NEMO/ICE 4.0 , NEMO Consortium (2018) |
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[10069] | 60 | !! $Id$ |
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[10413] | 61 | !! Software governed by the CeCILL licence (./LICENSE) |
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[8586] | 62 | !!---------------------------------------------------------------------- |
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| 63 | CONTAINS |
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| 64 | |
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[12377] | 65 | SUBROUTINE ice_dyn( kt, Kmm ) |
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[8586] | 66 | !!------------------------------------------------------------------- |
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| 67 | !! *** ROUTINE ice_dyn *** |
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[14072] | 68 | !! |
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[8586] | 69 | !! ** Purpose : this routine manages sea ice dynamics |
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| 70 | !! |
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[9604] | 71 | !! ** Action : - calculation of friction in case of landfast ice |
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| 72 | !! - call ice_dyn_rhg = rheology |
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| 73 | !! - call ice_dyn_adv = advection |
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| 74 | !! - call ice_dyn_rdgrft = ridging/rafting |
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| 75 | !! - call ice_cor = corrections if fields are out of bounds |
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[8586] | 76 | !!-------------------------------------------------------------------- |
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| 77 | INTEGER, INTENT(in) :: kt ! ice time step |
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[12377] | 78 | INTEGER, INTENT(in) :: Kmm ! ocean time level index |
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[8586] | 79 | !! |
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[10911] | 80 | INTEGER :: ji, jj ! dummy loop indices |
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[10413] | 81 | REAL(wp) :: zcoefu, zcoefv |
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[10911] | 82 | REAL(wp), ALLOCATABLE, DIMENSION(:,:) :: zdivu_i |
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[8586] | 83 | !!-------------------------------------------------------------------- |
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| 84 | ! |
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[10413] | 85 | ! controls |
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[14005] | 86 | IF( ln_timing ) CALL timing_start('ice_dyn') |
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[8586] | 87 | ! |
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| 88 | IF( kt == nit000 .AND. lwp ) THEN |
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| 89 | WRITE(numout,*) |
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| 90 | WRITE(numout,*)'ice_dyn: sea-ice dynamics' |
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| 91 | WRITE(numout,*)'~~~~~~~' |
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| 92 | ENDIF |
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[14072] | 93 | ! |
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[10911] | 94 | ! retrieve thickness from volume for landfast param. and UMx advection scheme |
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| 95 | WHERE( a_i(:,:,:) >= epsi20 ) |
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| 96 | h_i(:,:,:) = v_i(:,:,:) / a_i_b(:,:,:) |
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| 97 | h_s(:,:,:) = v_s(:,:,:) / a_i_b(:,:,:) |
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| 98 | ELSEWHERE |
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| 99 | h_i(:,:,:) = 0._wp |
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| 100 | h_s(:,:,:) = 0._wp |
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| 101 | END WHERE |
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[10413] | 102 | ! |
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[10911] | 103 | WHERE( a_ip(:,:,:) >= epsi20 ) |
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| 104 | h_ip(:,:,:) = v_ip(:,:,:) / a_ip(:,:,:) |
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[13472] | 105 | h_il(:,:,:) = v_il(:,:,:) / a_ip(:,:,:) |
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[10911] | 106 | ELSEWHERE |
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| 107 | h_ip(:,:,:) = 0._wp |
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[13472] | 108 | h_il(:,:,:) = 0._wp |
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[10911] | 109 | END WHERE |
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[8586] | 110 | ! |
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[14005] | 111 | IF( ln_landfast_L16 ) THEN |
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| 112 | CALL fld_read( kt, 1, sf_icbmsk ) |
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| 113 | icb_mask(:,:) = sf_icbmsk(1)%fnow(:,:,1) |
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| 114 | ENDIF |
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[8586] | 115 | ! |
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[10911] | 116 | SELECT CASE( nice_dyn ) !-- Set which dynamics is running |
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[8586] | 117 | |
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[10413] | 118 | CASE ( np_dynALL ) !== all dynamical processes ==! |
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[10911] | 119 | ! |
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[14072] | 120 | CALL ice_dyn_rhg ( kt, Kmm ) ! -- rheology |
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[10911] | 121 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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[14072] | 122 | CALL ice_dyn_rdgrft( kt ) ! -- ridging/rafting |
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[10911] | 123 | CALL ice_cor ( kt , 1 ) ! -- Corrections |
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| 124 | ! |
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[9076] | 125 | CASE ( np_dynRHGADV ) !== no ridge/raft & no corrections ==! |
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[10911] | 126 | ! |
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[14072] | 127 | CALL ice_dyn_rhg ( kt, Kmm ) ! -- rheology |
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[10911] | 128 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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| 129 | CALL Hpiling ! -- simple pile-up (replaces ridging/rafting) |
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[10994] | 130 | CALL ice_var_zapsmall ! -- zap small areas |
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[10911] | 131 | ! |
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[10413] | 132 | CASE ( np_dynADV1D ) !== pure advection ==! (1D) |
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[10911] | 133 | ! |
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[10413] | 134 | ! --- monotonicity test from Schar & Smolarkiewicz 1996 --- ! |
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| 135 | ! CFL = 0.5 at a distance from the bound of 1/6 of the basin length |
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[14072] | 136 | ! Then for dx = 2m and dt = 1s => rn_uice = u (1/6th) = 1m/s |
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[13295] | 137 | DO_2D( 1, 1, 1, 1 ) |
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[13472] | 138 | zcoefu = ( REAL(jpiglo+1)*0.5_wp - REAL(ji+nimpp-1) ) / ( REAL(jpiglo+1)*0.5_wp - 1._wp ) |
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| 139 | zcoefv = ( REAL(jpjglo+1)*0.5_wp - REAL(jj+njmpp-1) ) / ( REAL(jpjglo+1)*0.5_wp - 1._wp ) |
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| 140 | u_ice(ji,jj) = rn_uice * 1.5_wp * SIGN( 1.0_wp, zcoefu ) * ABS( zcoefu ) * umask(ji,jj,1) |
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| 141 | v_ice(ji,jj) = rn_vice * 1.5_wp * SIGN( 1.0_wp, zcoefv ) * ABS( zcoefv ) * vmask(ji,jj,1) |
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[12377] | 142 | END_2D |
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[10413] | 143 | ! --- |
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[10911] | 144 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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| 145 | ! |
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[10413] | 146 | CASE ( np_dynADV2D ) !== pure advection ==! (2D w prescribed velocities) |
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[10911] | 147 | ! |
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[8586] | 148 | u_ice(:,:) = rn_uice * umask(:,:,1) |
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| 149 | v_ice(:,:) = rn_vice * vmask(:,:,1) |
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[10413] | 150 | !CALL RANDOM_NUMBER(u_ice(:,:)) ; u_ice(:,:) = u_ice(:,:) * 0.1 + rn_uice * 0.9 * umask(:,:,1) |
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| 151 | !CALL RANDOM_NUMBER(v_ice(:,:)) ; v_ice(:,:) = v_ice(:,:) * 0.1 + rn_vice * 0.9 * vmask(:,:,1) |
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| 152 | ! --- |
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[10911] | 153 | CALL ice_dyn_adv ( kt ) ! -- advection of ice |
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[8586] | 154 | |
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| 155 | END SELECT |
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[10538] | 156 | ! |
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[8586] | 157 | ! |
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[14072] | 158 | ! diagnostics: divergence at T points |
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[10911] | 159 | IF( iom_use('icediv') ) THEN |
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| 160 | ! |
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| 161 | SELECT CASE( nice_dyn ) |
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[8586] | 162 | |
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[10911] | 163 | CASE ( np_dynADV1D , np_dynADV2D ) |
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[9124] | 164 | |
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[10911] | 165 | ALLOCATE( zdivu_i(jpi,jpj) ) |
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[13295] | 166 | DO_2D( 0, 0, 0, 0 ) |
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[12377] | 167 | zdivu_i(ji,jj) = ( e2u(ji,jj) * u_ice(ji,jj) - e2u(ji-1,jj) * u_ice(ji-1,jj) & |
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| 168 | & + e1v(ji,jj) * v_ice(ji,jj) - e1v(ji,jj-1) * v_ice(ji,jj-1) ) * r1_e1e2t(ji,jj) |
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| 169 | END_2D |
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[13226] | 170 | CALL lbc_lnk( 'icedyn', zdivu_i, 'T', 1.0_wp ) |
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[11536] | 171 | ! output |
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| 172 | CALL iom_put( 'icediv' , zdivu_i ) |
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| 173 | |
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[10911] | 174 | DEALLOCATE( zdivu_i ) |
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| 175 | |
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| 176 | END SELECT |
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| 177 | ! |
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| 178 | ENDIF |
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[8586] | 179 | ! |
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[10538] | 180 | ! controls |
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[14005] | 181 | IF( ln_timing ) CALL timing_stop ('ice_dyn') |
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[10538] | 182 | ! |
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[10911] | 183 | END SUBROUTINE ice_dyn |
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[8586] | 184 | |
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[9124] | 185 | |
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[8586] | 186 | SUBROUTINE Hpiling |
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| 187 | !!------------------------------------------------------------------- |
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| 188 | !! *** ROUTINE Hpiling *** |
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| 189 | !! |
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| 190 | !! ** Purpose : Simple conservative piling comparable with 1-cat models |
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| 191 | !! |
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| 192 | !! ** Method : pile-up ice when no ridging/rafting |
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| 193 | !! |
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| 194 | !! ** input : a_i |
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| 195 | !!------------------------------------------------------------------- |
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| 196 | INTEGER :: jl ! dummy loop indices |
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| 197 | !!------------------------------------------------------------------- |
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[10538] | 198 | ! controls |
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| 199 | IF( ln_icediachk ) CALL ice_cons_hsm(0, 'Hpiling', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft) ! conservation |
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[8586] | 200 | ! |
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| 201 | at_i(:,:) = SUM( a_i(:,:,:), dim=3 ) |
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| 202 | DO jl = 1, jpl |
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| 203 | WHERE( at_i(:,:) > epsi20 ) |
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| 204 | a_i(:,:,jl) = a_i(:,:,jl) * ( 1._wp + MIN( rn_amax_2d(:,:) - at_i(:,:) , 0._wp ) / at_i(:,:) ) |
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| 205 | END WHERE |
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| 206 | END DO |
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[10538] | 207 | ! controls |
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| 208 | IF( ln_icediachk ) CALL ice_cons_hsm(1, 'Hpiling', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft) ! conservation |
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[8586] | 209 | ! |
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| 210 | END SUBROUTINE Hpiling |
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| 211 | |
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[8637] | 212 | |
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[8586] | 213 | SUBROUTINE ice_dyn_init |
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| 214 | !!------------------------------------------------------------------- |
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| 215 | !! *** ROUTINE ice_dyn_init *** |
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| 216 | !! |
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| 217 | !! ** Purpose : Physical constants and parameters linked to the ice |
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| 218 | !! dynamics |
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| 219 | !! |
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| 220 | !! ** Method : Read the namdyn namelist and check the ice-dynamic |
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| 221 | !! parameter values called at the first timestep (nit000) |
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| 222 | !! |
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| 223 | !! ** input : Namelist namdyn |
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| 224 | !!------------------------------------------------------------------- |
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[14005] | 225 | INTEGER :: ios, ioptio, ierror ! Local integer output status for namelist read |
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| 226 | ! |
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| 227 | CHARACTER(len=256) :: cn_dir ! Root directory for location of ice files |
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| 228 | TYPE(FLD_N) :: sn_icbmsk ! informations about the grounded icebergs field to be read |
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[8586] | 229 | !! |
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[10413] | 230 | NAMELIST/namdyn/ ln_dynALL, ln_dynRHGADV, ln_dynADV1D, ln_dynADV2D, rn_uice, rn_vice, & |
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| 231 | & rn_ishlat , & |
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[14005] | 232 | & ln_landfast_L16, rn_lf_depfra, rn_lf_bfr, rn_lf_relax, rn_lf_tensile, & |
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| 233 | & sn_icbmsk, cn_dir |
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[8586] | 234 | !!------------------------------------------------------------------- |
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| 235 | ! |
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| 236 | READ ( numnam_ice_ref, namdyn, IOSTAT = ios, ERR = 901) |
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[11536] | 237 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namdyn in reference namelist' ) |
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[8586] | 238 | READ ( numnam_ice_cfg, namdyn, IOSTAT = ios, ERR = 902 ) |
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[11536] | 239 | 902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namdyn in configuration namelist' ) |
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[9169] | 240 | IF(lwm) WRITE( numoni, namdyn ) |
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[8586] | 241 | ! |
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| 242 | IF(lwp) THEN ! control print |
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| 243 | WRITE(numout,*) |
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| 244 | WRITE(numout,*) 'ice_dyn_init: ice parameters for ice dynamics ' |
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| 245 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 246 | WRITE(numout,*) ' Namelist namdyn:' |
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[10911] | 247 | WRITE(numout,*) ' Full ice dynamics (rhg + adv + ridge/raft + corr) ln_dynALL = ', ln_dynALL |
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| 248 | WRITE(numout,*) ' No ridge/raft & No cor (rhg + adv) ln_dynRHGADV = ', ln_dynRHGADV |
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| 249 | WRITE(numout,*) ' Advection 1D only (Schar & Smolarkiewicz 1996) ln_dynADV1D = ', ln_dynADV1D |
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| 250 | WRITE(numout,*) ' Advection 2D only (rn_uvice + adv) ln_dynADV2D = ', ln_dynADV2D |
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| 251 | WRITE(numout,*) ' with prescribed velocity given by (u,v)_ice = (rn_uice,rn_vice) = (', rn_uice,',',rn_vice,')' |
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| 252 | WRITE(numout,*) ' lateral boundary condition for sea ice dynamics rn_ishlat = ', rn_ishlat |
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| 253 | WRITE(numout,*) ' Landfast: param from Lemieux 2016 ln_landfast_L16 = ', ln_landfast_L16 |
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[13472] | 254 | WRITE(numout,*) ' fraction of ocean depth that ice must reach rn_lf_depfra = ', rn_lf_depfra |
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| 255 | WRITE(numout,*) ' maximum bottom stress per unit area of contact rn_lf_bfr = ', rn_lf_bfr |
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| 256 | WRITE(numout,*) ' relax time scale (s-1) to reach static friction rn_lf_relax = ', rn_lf_relax |
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| 257 | WRITE(numout,*) ' isotropic tensile strength rn_lf_tensile = ', rn_lf_tensile |
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[9169] | 258 | WRITE(numout,*) |
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[8586] | 259 | ENDIF |
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| 260 | ! !== set the choice of ice dynamics ==! |
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[14072] | 261 | ioptio = 0 |
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[8586] | 262 | ! !--- full dynamics (rheology + advection + ridging/rafting + correction) |
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[10413] | 263 | IF( ln_dynALL ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynALL ; ENDIF |
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[8586] | 264 | ! !--- dynamics without ridging/rafting and corr (rheology + advection) |
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[9076] | 265 | IF( ln_dynRHGADV ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynRHGADV ; ENDIF |
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[10413] | 266 | ! !--- advection 1D only - test case from Schar & Smolarkiewicz 1996 |
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| 267 | IF( ln_dynADV1D ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynADV1D ; ENDIF |
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| 268 | ! !--- advection 2D only with prescribed ice velocities (from namelist) |
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| 269 | IF( ln_dynADV2D ) THEN ; ioptio = ioptio + 1 ; nice_dyn = np_dynADV2D ; ENDIF |
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[8586] | 270 | ! |
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| 271 | IF( ioptio /= 1 ) CALL ctl_stop( 'ice_dyn_init: one and only one ice dynamics option has to be defined ' ) |
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| 272 | ! |
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| 273 | ! !--- Lateral boundary conditions |
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| 274 | IF ( rn_ishlat == 0. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral free-slip' |
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| 275 | ELSEIF ( rn_ishlat == 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral no-slip' |
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| 276 | ELSEIF ( 0. < rn_ishlat .AND. rn_ishlat < 2. ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral partial-slip' |
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| 277 | ELSEIF ( 2. < rn_ishlat ) THEN ; IF(lwp) WRITE(numout,*) ' ===>>> ice lateral strong-slip' |
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| 278 | ENDIF |
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[10413] | 279 | ! !--- Landfast ice |
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[11536] | 280 | IF( .NOT.ln_landfast_L16 ) tau_icebfr(:,:) = 0._wp |
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[8586] | 281 | ! |
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[14005] | 282 | ! !--- allocate and fill structure for grounded icebergs mask |
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| 283 | IF( ln_landfast_L16 ) THEN |
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| 284 | ALLOCATE( sf_icbmsk(1), STAT=ierror ) |
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| 285 | IF( ierror > 0 ) THEN |
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| 286 | CALL ctl_stop( 'ice_dyn_init: unable to allocate sf_icbmsk structure' ) ; RETURN |
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| 287 | ENDIF |
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| 288 | ! |
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| 289 | CALL fld_fill( sf_icbmsk, (/ sn_icbmsk /), cn_dir, 'ice_dyn_init', & |
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| 290 | & 'landfast ice is a function of read grounded icebergs', 'icedyn' ) |
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| 291 | ! |
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| 292 | ALLOCATE( sf_icbmsk(1)%fnow(jpi,jpj,1) ) |
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| 293 | IF( sf_icbmsk(1)%ln_tint ) ALLOCATE( sf_icbmsk(1)%fdta(jpi,jpj,1,2) ) |
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[14072] | 294 | IF( TRIM(sf_icbmsk(1)%clrootname) == 'NOT USED' ) sf_icbmsk(1)%fnow(:,:,1) = 0._wp ! not used field (set to 0) |
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[14005] | 295 | ELSE |
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| 296 | icb_mask(:,:) = 0._wp |
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| 297 | ENDIF |
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[14072] | 298 | ! !--- other init |
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[8586] | 299 | CALL ice_dyn_rdgrft_init ! set ice ridging/rafting parameters |
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| 300 | CALL ice_dyn_rhg_init ! set ice rheology parameters |
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| 301 | CALL ice_dyn_adv_init ! set ice advection parameters |
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| 302 | ! |
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| 303 | END SUBROUTINE ice_dyn_init |
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| 304 | |
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| 305 | #else |
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| 306 | !!---------------------------------------------------------------------- |
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[9570] | 307 | !! Default option Empty module NO SI3 sea-ice model |
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[8586] | 308 | !!---------------------------------------------------------------------- |
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[14072] | 309 | #endif |
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[8586] | 310 | |
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| 311 | !!====================================================================== |
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| 312 | END MODULE icedyn |
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