[825] | 1 | MODULE limdyn |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE limdyn *** |
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| 4 | !! Sea-Ice dynamics : |
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| 5 | !!====================================================================== |
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[2715] | 6 | !! history : 1.0 ! 2002-08 (C. Ethe, G. Madec) original VP code |
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| 7 | !! 3.0 ! 2007-03 (MA Morales Maqueda, S. Bouillon, M. Vancoppenolle) LIM3: EVP-Cgrid |
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[5443] | 8 | !! 3.5 ! 2011-02 (G. Madec) dynamical allocation |
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[2528] | 9 | !!---------------------------------------------------------------------- |
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[825] | 10 | #if defined key_lim3 |
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| 11 | !!---------------------------------------------------------------------- |
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[834] | 12 | !! 'key_lim3' : LIM3 sea-ice model |
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[825] | 13 | !!---------------------------------------------------------------------- |
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| 14 | !! lim_dyn : computes ice velocities |
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| 15 | !! lim_dyn_init : initialization and namelist read |
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| 16 | !!---------------------------------------------------------------------- |
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[4161] | 17 | USE phycst ! physical constants |
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| 18 | USE dom_oce ! ocean space and time domain |
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| 19 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 20 | USE sbc_ice ! Surface boundary condition: ice fields |
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| 21 | USE ice ! LIM-3 variables |
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| 22 | USE dom_ice ! LIM-3 domain |
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| 23 | USE limrhg ! LIM-3 rheology |
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| 24 | USE lbclnk ! lateral boundary conditions - MPP exchanges |
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| 25 | USE lib_mpp ! MPP library |
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| 26 | USE wrk_nemo ! work arrays |
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| 27 | USE in_out_manager ! I/O manager |
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| 28 | USE prtctl ! Print control |
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| 29 | USE lib_fortran ! glob_sum |
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| 30 | USE timing ! Timing |
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[4688] | 31 | USE limcons ! conservation tests |
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[5443] | 32 | USE limvar |
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[825] | 33 | |
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| 34 | IMPLICIT NONE |
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| 35 | PRIVATE |
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| 36 | |
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[2528] | 37 | PUBLIC lim_dyn ! routine called by ice_step |
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[825] | 38 | |
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[868] | 39 | !! * Substitutions |
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| 40 | # include "vectopt_loop_substitute.h90" |
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[825] | 41 | !!---------------------------------------------------------------------- |
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[4161] | 42 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
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[5234] | 43 | !! $Id$ |
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[2528] | 44 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[825] | 45 | !!---------------------------------------------------------------------- |
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| 46 | CONTAINS |
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| 47 | |
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[921] | 48 | SUBROUTINE lim_dyn( kt ) |
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[825] | 49 | !!------------------------------------------------------------------- |
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| 50 | !! *** ROUTINE lim_dyn *** |
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| 51 | !! |
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| 52 | !! ** Purpose : compute ice velocity and ocean-ice stress |
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| 53 | !! |
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| 54 | !! ** Method : |
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| 55 | !! |
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| 56 | !! ** Action : - Initialisation |
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| 57 | !! - Call of the dynamic routine for each hemisphere |
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| 58 | !! - computation of the stress at the ocean surface |
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| 59 | !! - treatment of the case if no ice dynamic |
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| 60 | !!------------------------------------------------------------------------------------ |
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[921] | 61 | INTEGER, INTENT(in) :: kt ! number of iteration |
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[2528] | 62 | !! |
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[913] | 63 | INTEGER :: ji, jj, jl, ja ! dummy loop indices |
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| 64 | INTEGER :: i_j1, i_jpj ! Starting/ending j-indices for rheology |
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[2528] | 65 | REAL(wp) :: zcoef ! local scalar |
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[4990] | 66 | REAL(wp), POINTER, DIMENSION(:) :: zswitch ! i-averaged indicator of sea-ice |
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[3294] | 67 | REAL(wp), POINTER, DIMENSION(:) :: zmsk ! i-averaged of tmask |
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| 68 | REAL(wp), POINTER, DIMENSION(:,:) :: zu_io, zv_io ! ice-ocean velocity |
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[4688] | 69 | ! |
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| 70 | REAL(wp) :: zvi_b, zsmv_b, zei_b, zfs_b, zfw_b, zft_b |
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[4161] | 71 | !!--------------------------------------------------------------------- |
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[825] | 72 | |
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[4161] | 73 | IF( nn_timing == 1 ) CALL timing_start('limdyn') |
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| 74 | |
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[3294] | 75 | CALL wrk_alloc( jpi, jpj, zu_io, zv_io ) |
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[4990] | 76 | CALL wrk_alloc( jpj, zswitch, zmsk ) |
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[825] | 77 | |
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[5443] | 78 | CALL lim_var_agg(1) ! aggregate ice categories |
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| 79 | |
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[2715] | 80 | IF( kt == nit000 ) CALL lim_dyn_init ! Initialization (first time-step only) |
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[921] | 81 | |
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[2715] | 82 | IF( ln_limdyn ) THEN |
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| 83 | ! |
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[4688] | 84 | ! conservation test |
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| 85 | IF( ln_limdiahsb ) CALL lim_cons_hsm(0, 'limdyn', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b) |
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| 86 | |
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[5443] | 87 | u_ice_b(:,:) = u_ice(:,:) * umask(:,:,1) |
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| 88 | v_ice_b(:,:) = v_ice(:,:) * vmask(:,:,1) |
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[825] | 89 | |
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[834] | 90 | ! Rheology (ice dynamics) |
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| 91 | ! ======== |
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[825] | 92 | |
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| 93 | ! Define the j-limits where ice rheology is computed |
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| 94 | ! --------------------------------------------------- |
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| 95 | |
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[2528] | 96 | IF( lk_mpp .OR. lk_mpp_rep ) THEN ! mpp: compute over the whole domain |
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[825] | 97 | i_j1 = 1 |
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| 98 | i_jpj = jpj |
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| 99 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
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| 100 | CALL lim_rhg( i_j1, i_jpj ) |
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| 101 | ELSE ! optimization of the computational area |
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[2715] | 102 | ! |
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[825] | 103 | DO jj = 1, jpj |
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[4990] | 104 | zswitch(jj) = SUM( 1.0 - at_i(:,jj) ) ! = REAL(jpj) if ocean everywhere on a j-line |
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[5443] | 105 | zmsk (jj) = SUM( tmask(:,jj,1) ) ! = 0 if land everywhere on a j-line |
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[825] | 106 | END DO |
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| 107 | |
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| 108 | IF( l_jeq ) THEN ! local domain include both hemisphere |
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| 109 | ! ! Rheology is computed in each hemisphere |
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| 110 | ! ! only over the ice cover latitude strip |
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| 111 | ! Northern hemisphere |
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| 112 | i_j1 = njeq |
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| 113 | i_jpj = jpj |
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[4990] | 114 | DO WHILE ( i_j1 <= jpj .AND. zswitch(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
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[825] | 115 | i_j1 = i_j1 + 1 |
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| 116 | END DO |
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[1103] | 117 | i_j1 = MAX( 1, i_j1-2 ) |
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[825] | 118 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : NH i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
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| 119 | CALL lim_rhg( i_j1, i_jpj ) |
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[2715] | 120 | ! |
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[825] | 121 | ! Southern hemisphere |
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| 122 | i_j1 = 1 |
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| 123 | i_jpj = njeq |
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[4990] | 124 | DO WHILE ( i_jpj >= 1 .AND. zswitch(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
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[825] | 125 | i_jpj = i_jpj - 1 |
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| 126 | END DO |
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[1103] | 127 | i_jpj = MIN( jpj, i_jpj+1 ) |
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[825] | 128 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : SH i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
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[2715] | 129 | ! |
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| 130 | CALL lim_rhg( i_j1, i_jpj ) |
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| 131 | ! |
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| 132 | ELSE ! local domain extends over one hemisphere only |
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| 133 | ! ! Rheology is computed only over the ice cover |
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| 134 | ! ! latitude strip |
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| 135 | i_j1 = 1 |
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[4990] | 136 | DO WHILE ( i_j1 <= jpj .AND. zswitch(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
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[825] | 137 | i_j1 = i_j1 + 1 |
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| 138 | END DO |
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[1103] | 139 | i_j1 = MAX( 1, i_j1-2 ) |
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[825] | 140 | |
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| 141 | i_jpj = jpj |
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[4990] | 142 | DO WHILE ( i_jpj >= 1 .AND. zswitch(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
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[825] | 143 | i_jpj = i_jpj - 1 |
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| 144 | END DO |
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[1103] | 145 | i_jpj = MIN( jpj, i_jpj+1) |
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[2715] | 146 | ! |
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[825] | 147 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : one hemisphere: i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
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[2715] | 148 | ! |
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[825] | 149 | CALL lim_rhg( i_j1, i_jpj ) |
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[2715] | 150 | ! |
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[825] | 151 | ENDIF |
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[2715] | 152 | ! |
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[825] | 153 | ENDIF |
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| 154 | |
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[888] | 155 | ! computation of friction velocity |
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[913] | 156 | ! -------------------------------- |
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[1470] | 157 | ! ice-ocean velocity at U & V-points (u_ice v_ice at U- & V-points ; ssu_m, ssv_m at U- & V-points) |
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[913] | 158 | zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) |
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| 159 | zv_io(:,:) = v_ice(:,:) - ssv_m(:,:) |
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| 160 | ! frictional velocity at T-point |
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[5443] | 161 | zcoef = 0.5_wp * rn_cio |
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[913] | 162 | DO jj = 2, jpjm1 |
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| 163 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2528] | 164 | ust2s(ji,jj) = zcoef * ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) & |
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[5443] | 165 | & + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) * tmask(ji,jj,1) |
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[825] | 166 | END DO |
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| 167 | END DO |
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[913] | 168 | ! |
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[4688] | 169 | ! conservation test |
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| 170 | IF( ln_limdiahsb ) CALL lim_cons_hsm(1, 'limdyn', zvi_b, zsmv_b, zei_b, zfw_b, zfs_b, zft_b) |
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| 171 | ! |
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[913] | 172 | ELSE ! no ice dynamics : transmit directly the atmospheric stress to the ocean |
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| 173 | ! |
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[5443] | 174 | zcoef = SQRT( 0.5_wp ) * r1_rau0 |
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[913] | 175 | DO jj = 2, jpjm1 |
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| 176 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2528] | 177 | ust2s(ji,jj) = zcoef * SQRT( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & |
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[5443] | 178 | & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) * tmask(ji,jj,1) |
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[825] | 179 | END DO |
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| 180 | END DO |
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[913] | 181 | ! |
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[825] | 182 | ENDIF |
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| 183 | CALL lbc_lnk( ust2s, 'T', 1. ) ! T-point |
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| 184 | |
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[863] | 185 | IF(ln_ctl) THEN ! Control print |
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[867] | 186 | CALL prt_ctl_info(' ') |
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| 187 | CALL prt_ctl_info(' - Cell values : ') |
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| 188 | CALL prt_ctl_info(' ~~~~~~~~~~~~~ ') |
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[863] | 189 | CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :') |
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| 190 | CALL prt_ctl(tab2d_1=divu_i , clinfo1=' lim_dyn : divu_i :') |
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| 191 | CALL prt_ctl(tab2d_1=delta_i , clinfo1=' lim_dyn : delta_i :') |
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| 192 | CALL prt_ctl(tab2d_1=strength , clinfo1=' lim_dyn : strength :') |
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[5443] | 193 | CALL prt_ctl(tab2d_1=e12t , clinfo1=' lim_dyn : cell area :') |
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[863] | 194 | CALL prt_ctl(tab2d_1=at_i , clinfo1=' lim_dyn : at_i :') |
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| 195 | CALL prt_ctl(tab2d_1=vt_i , clinfo1=' lim_dyn : vt_i :') |
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| 196 | CALL prt_ctl(tab2d_1=vt_s , clinfo1=' lim_dyn : vt_s :') |
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| 197 | CALL prt_ctl(tab2d_1=stress1_i , clinfo1=' lim_dyn : stress1_i :') |
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| 198 | CALL prt_ctl(tab2d_1=stress2_i , clinfo1=' lim_dyn : stress2_i :') |
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| 199 | CALL prt_ctl(tab2d_1=stress12_i, clinfo1=' lim_dyn : stress12_i:') |
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| 200 | DO jl = 1, jpl |
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[867] | 201 | CALL prt_ctl_info(' ') |
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[863] | 202 | CALL prt_ctl_info(' - Category : ', ivar1=jl) |
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| 203 | CALL prt_ctl_info(' ~~~~~~~~~~') |
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| 204 | CALL prt_ctl(tab2d_1=a_i (:,:,jl) , clinfo1= ' lim_dyn : a_i : ') |
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| 205 | CALL prt_ctl(tab2d_1=ht_i (:,:,jl) , clinfo1= ' lim_dyn : ht_i : ') |
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| 206 | CALL prt_ctl(tab2d_1=ht_s (:,:,jl) , clinfo1= ' lim_dyn : ht_s : ') |
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| 207 | CALL prt_ctl(tab2d_1=v_i (:,:,jl) , clinfo1= ' lim_dyn : v_i : ') |
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| 208 | CALL prt_ctl(tab2d_1=v_s (:,:,jl) , clinfo1= ' lim_dyn : v_s : ') |
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| 209 | CALL prt_ctl(tab2d_1=e_s (:,:,1,jl) , clinfo1= ' lim_dyn : e_s : ') |
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| 210 | CALL prt_ctl(tab2d_1=t_su (:,:,jl) , clinfo1= ' lim_dyn : t_su : ') |
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| 211 | CALL prt_ctl(tab2d_1=t_s (:,:,1,jl) , clinfo1= ' lim_dyn : t_snow : ') |
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| 212 | CALL prt_ctl(tab2d_1=sm_i (:,:,jl) , clinfo1= ' lim_dyn : sm_i : ') |
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| 213 | CALL prt_ctl(tab2d_1=smv_i (:,:,jl) , clinfo1= ' lim_dyn : smv_i : ') |
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| 214 | DO ja = 1, nlay_i |
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[867] | 215 | CALL prt_ctl_info(' ') |
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[863] | 216 | CALL prt_ctl_info(' - Layer : ', ivar1=ja) |
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| 217 | CALL prt_ctl_info(' ~~~~~~~') |
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| 218 | CALL prt_ctl(tab2d_1=t_i(:,:,ja,jl) , clinfo1= ' lim_dyn : t_i : ') |
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| 219 | CALL prt_ctl(tab2d_1=e_i(:,:,ja,jl) , clinfo1= ' lim_dyn : e_i : ') |
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| 220 | END DO |
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| 221 | END DO |
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[825] | 222 | ENDIF |
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[2528] | 223 | ! |
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[3294] | 224 | CALL wrk_dealloc( jpi, jpj, zu_io, zv_io ) |
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[4990] | 225 | CALL wrk_dealloc( jpj, zswitch, zmsk ) |
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[2715] | 226 | ! |
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[4161] | 227 | IF( nn_timing == 1 ) CALL timing_stop('limdyn') |
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| 228 | |
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[825] | 229 | END SUBROUTINE lim_dyn |
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| 230 | |
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[2528] | 231 | |
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[921] | 232 | SUBROUTINE lim_dyn_init |
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[825] | 233 | !!------------------------------------------------------------------- |
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| 234 | !! *** ROUTINE lim_dyn_init *** |
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| 235 | !! |
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| 236 | !! ** Purpose : Physical constants and parameters linked to the ice |
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| 237 | !! dynamics |
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| 238 | !! |
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| 239 | !! ** Method : Read the namicedyn namelist and check the ice-dynamic |
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| 240 | !! parameter values called at the first timestep (nit000) |
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| 241 | !! |
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| 242 | !! ** input : Namelist namicedyn |
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| 243 | !!------------------------------------------------------------------- |
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[4147] | 244 | INTEGER :: ios ! Local integer output status for namelist read |
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[5443] | 245 | NAMELIST/namicedyn/ nn_icestr, ln_icestr_bvf, rn_pe_rdg, rn_pstar, rn_crhg, rn_cio, rn_creepl, rn_ecc, & |
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| 246 | & nn_nevp, rn_relast, nn_ahi0, rn_ahi0_ref |
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| 247 | INTEGER :: ji, jj |
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| 248 | REAL(wp) :: za00, zd_max |
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[825] | 249 | !!------------------------------------------------------------------- |
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| 250 | |
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[4147] | 251 | REWIND( numnam_ice_ref ) ! Namelist namicedyn in reference namelist : Ice dynamics |
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| 252 | READ ( numnam_ice_ref, namicedyn, IOSTAT = ios, ERR = 901) |
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| 253 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicedyn in reference namelist', lwp ) |
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| 254 | |
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| 255 | REWIND( numnam_ice_cfg ) ! Namelist namicedyn in configuration namelist : Ice dynamics |
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| 256 | READ ( numnam_ice_cfg, namicedyn, IOSTAT = ios, ERR = 902 ) |
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| 257 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicedyn in configuration namelist', lwp ) |
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[4624] | 258 | IF(lwm) WRITE ( numoni, namicedyn ) |
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[2528] | 259 | |
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| 260 | IF(lwp) THEN ! control print |
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[825] | 261 | WRITE(numout,*) |
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| 262 | WRITE(numout,*) 'lim_dyn_init : ice parameters for ice dynamics ' |
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| 263 | WRITE(numout,*) '~~~~~~~~~~~~' |
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[5443] | 264 | WRITE(numout,*)' ice strength parameterization (0=Hibler 1=Rothrock) nn_icestr = ', nn_icestr |
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| 265 | WRITE(numout,*)' Including brine volume in ice strength comp. ln_icestr_bvf = ', ln_icestr_bvf |
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| 266 | WRITE(numout,*)' Ratio of ridging work to PotEner change in ridging rn_pe_rdg = ', rn_pe_rdg |
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| 267 | WRITE(numout,*) ' drag coefficient for oceanic stress rn_cio = ', rn_cio |
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| 268 | WRITE(numout,*) ' first bulk-rheology parameter rn_pstar = ', rn_pstar |
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| 269 | WRITE(numout,*) ' second bulk-rhelogy parameter rn_crhg = ', rn_crhg |
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| 270 | WRITE(numout,*) ' creep limit rn_creepl = ', rn_creepl |
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| 271 | WRITE(numout,*) ' eccentricity of the elliptical yield curve rn_ecc = ', rn_ecc |
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| 272 | WRITE(numout,*) ' number of iterations for subcycling nn_nevp = ', nn_nevp |
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| 273 | WRITE(numout,*) ' ratio of elastic timescale over ice time step rn_relast = ', rn_relast |
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| 274 | WRITE(numout,*) ' horizontal diffusivity calculation nn_ahi0 = ', nn_ahi0 |
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| 275 | WRITE(numout,*) ' horizontal diffusivity coeff. (orca2 grid) rn_ahi0_ref = ', rn_ahi0_ref |
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[825] | 276 | ENDIF |
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[2528] | 277 | ! |
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[5443] | 278 | usecc2 = 1._wp / ( rn_ecc * rn_ecc ) |
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| 279 | rhoco = rau0 * rn_cio |
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| 280 | ! |
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| 281 | ! Diffusion coefficients |
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| 282 | SELECT CASE( nn_ahi0 ) |
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[825] | 283 | |
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[5443] | 284 | CASE( 0 ) |
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| 285 | ahiu(:,:) = rn_ahi0_ref |
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| 286 | ahiv(:,:) = rn_ahi0_ref |
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[4863] | 287 | |
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[5443] | 288 | IF(lwp) WRITE(numout,*) '' |
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| 289 | IF(lwp) WRITE(numout,*) ' laplacian operator: ahim constant = rn_ahi0_ref' |
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| 290 | |
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| 291 | CASE( 1 ) |
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| 292 | |
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| 293 | zd_max = MAX( MAXVAL( e1t(:,:) ), MAXVAL( e2t(:,:) ) ) |
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| 294 | IF( lk_mpp ) CALL mpp_max( zd_max ) ! max over the global domain |
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| 295 | |
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| 296 | ahiu(:,:) = rn_ahi0_ref * zd_max * 1.e-05_wp ! 1.e05 = 100km = max grid space at 60° latitude in orca2 |
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| 297 | ! (60° = min latitude for ice cover) |
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| 298 | ahiv(:,:) = rn_ahi0_ref * zd_max * 1.e-05_wp |
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| 299 | |
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| 300 | IF(lwp) WRITE(numout,*) '' |
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| 301 | IF(lwp) WRITE(numout,*) ' laplacian operator: ahim proportional to max of e1 e2 over the domain (', zd_max, ')' |
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| 302 | IF(lwp) WRITE(numout,*) ' value for ahim = ', rn_ahi0_ref * zd_max * 1.e-05_wp |
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| 303 | |
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| 304 | CASE( 2 ) |
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| 305 | |
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| 306 | zd_max = MAX( MAXVAL( e1t(:,:) ), MAXVAL( e2t(:,:) ) ) |
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| 307 | IF( lk_mpp ) CALL mpp_max( zd_max ) ! max over the global domain |
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| 308 | |
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| 309 | za00 = rn_ahi0_ref * 1.e-05_wp ! 1.e05 = 100km = max grid space at 60° latitude in orca2 |
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| 310 | ! (60° = min latitude for ice cover) |
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| 311 | DO jj = 1, jpj |
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| 312 | DO ji = 1, jpi |
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| 313 | ahiu(ji,jj) = za00 * MAX( e1t(ji,jj), e2t(ji,jj) ) * umask(ji,jj,1) |
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| 314 | ahiv(ji,jj) = za00 * MAX( e1f(ji,jj), e2f(ji,jj) ) * vmask(ji,jj,1) |
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| 315 | END DO |
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| 316 | END DO |
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| 317 | ! |
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| 318 | IF(lwp) WRITE(numout,*) '' |
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| 319 | IF(lwp) WRITE(numout,*) ' laplacian operator: ahim proportional to e1' |
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| 320 | IF(lwp) WRITE(numout,*) ' maximum grid-spacing = ', zd_max, ' maximum value for ahim = ', za00*zd_max |
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| 321 | |
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| 322 | END SELECT |
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| 323 | |
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[825] | 324 | END SUBROUTINE lim_dyn_init |
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| 325 | |
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| 326 | #else |
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| 327 | !!---------------------------------------------------------------------- |
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| 328 | !! Default option Empty module NO LIM sea-ice model |
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| 329 | !!---------------------------------------------------------------------- |
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| 330 | CONTAINS |
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| 331 | SUBROUTINE lim_dyn ! Empty routine |
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| 332 | END SUBROUTINE lim_dyn |
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| 333 | #endif |
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| 334 | |
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| 335 | !!====================================================================== |
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| 336 | END MODULE limdyn |
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