[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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| 6 | #if defined key_lim3 |
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| 7 | !!---------------------------------------------------------------------- |
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[834] | 8 | !! 'key_lim3' : LIM3 sea-ice model |
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[825] | 9 | !!---------------------------------------------------------------------- |
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| 10 | !! lim_dyn : computes ice velocities |
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| 11 | !! lim_dyn_init : initialization and namelist read |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | !! * Modules used |
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| 14 | USE phycst |
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| 15 | USE in_out_manager ! I/O manager |
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| 16 | USE dom_ice |
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| 17 | USE dom_oce ! ocean space and time domain |
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| 18 | USE ice |
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[863] | 19 | USE par_ice |
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[888] | 20 | USE sbc_ice ! Surface boundary condition: ice fields |
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[825] | 21 | USE ice_oce |
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| 22 | USE iceini |
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| 23 | USE limistate |
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| 24 | USE limrhg ! ice rheology |
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| 25 | USE lbclnk |
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| 26 | USE lib_mpp |
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| 27 | USE prtctl ! Print control |
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| 28 | |
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| 29 | IMPLICIT NONE |
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| 30 | PRIVATE |
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| 31 | |
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| 32 | !! * Accessibility |
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| 33 | PUBLIC lim_dyn ! routine called by ice_step |
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| 34 | |
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[868] | 35 | !! * Substitutions |
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| 36 | # include "vectopt_loop_substitute.h90" |
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| 37 | |
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[825] | 38 | !! * Module variables |
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| 39 | REAL(wp) :: rone = 1.e0 ! constant value |
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| 40 | |
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| 41 | !!---------------------------------------------------------------------- |
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[834] | 42 | !! LIM 3.0, UCL-ASTR-LOCEAN-IPSL (2008) |
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[888] | 43 | !! $ Id: $ |
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| 44 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
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[825] | 45 | !!---------------------------------------------------------------------- |
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| 46 | |
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| 47 | CONTAINS |
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| 48 | |
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| 49 | SUBROUTINE lim_dyn |
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| 50 | !!------------------------------------------------------------------- |
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| 51 | !! *** ROUTINE lim_dyn *** |
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| 52 | !! |
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| 53 | !! ** Purpose : compute ice velocity and ocean-ice stress |
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| 54 | !! |
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| 55 | !! ** Method : |
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| 56 | !! |
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| 57 | !! ** Action : - Initialisation |
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| 58 | !! - Call of the dynamic routine for each hemisphere |
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| 59 | !! - computation of the stress at the ocean surface |
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| 60 | !! - treatment of the case if no ice dynamic |
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| 61 | !! History : |
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| 62 | !! 1.0 ! 01-04 (LIM) Original code |
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| 63 | !! 2.0 ! 02-08 (C. Ethe, G. Madec) F90, mpp |
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[834] | 64 | !! 3.0 ! 2007-03 (M.A. Morales Maqueda, S. Bouillon, M. Vancoppenolle) |
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| 65 | !! LIM3, EVP, C-grid |
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[825] | 66 | !!------------------------------------------------------------------------------------ |
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| 67 | !! * Local variables |
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[863] | 68 | INTEGER :: ji, jj, jl, ja ! dummy loop indices |
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[825] | 69 | INTEGER :: i_j1, i_jpj ! Starting/ending j-indices for rheology |
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[834] | 70 | |
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[825] | 71 | REAL(wp) :: & |
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| 72 | ztairx, ztairy, & ! tempory scalars |
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| 73 | zsang , zmod, & |
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| 74 | ztglx , ztgly , & |
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| 75 | zt11, zt12, zt21, zt22 , & |
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[834] | 76 | zustm, & |
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[825] | 77 | zsfrldmx2, zsfrldmy2, & |
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| 78 | zu_ice, zv_ice, ztair2 |
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[834] | 79 | |
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[825] | 80 | REAL(wp),DIMENSION(jpj) :: & |
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| 81 | zind, & ! i-averaged indicator of sea-ice |
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| 82 | zmsk ! i-averaged of tmask |
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| 83 | !!--------------------------------------------------------------------- |
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| 84 | |
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| 85 | WRITE(numout,*) ' lim_dyn : Ice dynamics ' |
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| 86 | WRITE(numout,*) ' ~~~~~~~ ' |
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| 87 | |
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| 88 | IF( numit == nstart ) CALL lim_dyn_init ! Initialization (first time-step only) |
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| 89 | |
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| 90 | IF ( ln_limdyn ) THEN |
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| 91 | |
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| 92 | old_u_ice(:,:) = u_ice(:,:) * tmu(:,:) |
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| 93 | old_v_ice(:,:) = v_ice(:,:) * tmv(:,:) |
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| 94 | |
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[834] | 95 | ! Rheology (ice dynamics) |
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| 96 | ! ======== |
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[825] | 97 | |
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| 98 | ! Define the j-limits where ice rheology is computed |
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| 99 | ! --------------------------------------------------- |
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| 100 | |
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[869] | 101 | IF( lk_mpp .OR. nbit_cmp == 1 ) THEN ! mpp: compute over the whole domain |
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[825] | 102 | i_j1 = 1 |
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| 103 | i_jpj = jpj |
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| 104 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
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| 105 | CALL lim_rhg( i_j1, i_jpj ) |
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| 106 | ELSE ! optimization of the computational area |
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| 107 | |
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| 108 | DO jj = 1, jpj |
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| 109 | zind(jj) = SUM( 1.0 - at_i (:,jj ) ) ! = FLOAT(jpj) if ocean everywhere on a j-line |
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| 110 | zmsk(jj) = SUM( tmask(:,jj,1) ) ! = 0 if land everywhere on a j-line |
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| 111 | END DO |
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| 112 | |
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| 113 | IF( l_jeq ) THEN ! local domain include both hemisphere |
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| 114 | ! ! Rheology is computed in each hemisphere |
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| 115 | ! ! only over the ice cover latitude strip |
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| 116 | ! Northern hemisphere |
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| 117 | i_j1 = njeq |
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| 118 | i_jpj = jpj |
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| 119 | DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
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| 120 | i_j1 = i_j1 + 1 |
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| 121 | END DO |
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| 122 | i_j1 = MAX( 1, i_j1-1 ) |
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| 123 | 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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| 124 | CALL lim_rhg( i_j1, i_jpj ) |
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| 125 | |
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| 126 | ! Southern hemisphere |
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| 127 | i_j1 = 1 |
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| 128 | i_jpj = njeq |
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| 129 | DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
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| 130 | i_jpj = i_jpj - 1 |
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| 131 | END DO |
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| 132 | i_jpj = MIN( jpj, i_jpj+2 ) |
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| 133 | 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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| 134 | |
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| 135 | CALL lim_rhg( i_j1, i_jpj ) |
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| 136 | |
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| 137 | ELSE ! local domain extends over one hemisphere only |
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| 138 | ! ! Rheology is computed only over the ice cover |
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| 139 | ! ! latitude strip |
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| 140 | i_j1 = 1 |
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| 141 | DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
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| 142 | i_j1 = i_j1 + 1 |
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| 143 | END DO |
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| 144 | i_j1 = MAX( 1, i_j1-1 ) |
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| 145 | |
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| 146 | i_jpj = jpj |
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| 147 | DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
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| 148 | i_jpj = i_jpj - 1 |
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| 149 | END DO |
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| 150 | i_jpj = MIN( jpj, i_jpj+2) |
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| 151 | |
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| 152 | 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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| 153 | |
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| 154 | CALL lim_rhg( i_j1, i_jpj ) |
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| 155 | |
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| 156 | ENDIF |
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| 157 | |
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| 158 | ENDIF |
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| 159 | |
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[888] | 160 | ! computation of friction velocity |
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[825] | 161 | DO jj = 2, jpjm1 |
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[868] | 162 | DO ji = fs_2, fs_jpim1 |
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[825] | 163 | |
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| 164 | zu_ice = u_ice(ji,jj) - u_oce(ji,jj) |
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| 165 | zt11 = rhoco * zu_ice * zu_ice |
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| 166 | |
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[888] | 167 | zu_ice = u_ice(ji-1,jj) - u_oce(ji-1,jj) |
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[825] | 168 | zt12 = rhoco * zu_ice * zu_ice |
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| 169 | |
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[888] | 170 | zv_ice = v_ice(ji,jj) - v_oce(ji,jj) |
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[825] | 171 | zt21 = rhoco * zv_ice * zv_ice |
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| 172 | |
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[888] | 173 | zv_ice = v_ice(ji,jj-1) - v_oce(ji,jj-1) |
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[825] | 174 | zt22 = rhoco * zv_ice * zv_ice |
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[888] | 175 | ztair2 = ( ( utaui_ice(ji,jj) + utaui_ice(ji-1,jj) ) / 2. )**2 + & |
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| 176 | ( ( vtaui_ice(ji,jj) + vtaui_ice(ji,jj-1) ) / 2. )**2 |
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[825] | 177 | |
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| 178 | ! should not be weighted |
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| 179 | zustm = ( at_i(ji,jj) ) * 0.5 * ( zt11 + zt12 + zt21 + zt22 ) & |
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| 180 | & + ( 1.0 - at_i(ji,jj) ) * SQRT( ztair2 ) |
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| 181 | |
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| 182 | ust2s(ji,jj) = ( zustm / rau0 ) * ( rone + sdvt(ji,jj) ) * tms(ji,jj) |
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| 183 | |
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| 184 | END DO |
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| 185 | END DO |
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| 186 | |
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| 187 | ELSE ! If no ice dynamics |
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| 188 | |
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| 189 | ! virer ca (key_lim_cp1) |
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| 190 | DO jj = 2, jpjm1 |
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[868] | 191 | DO ji = fs_2, fs_jpim1 |
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[888] | 192 | ztair2 = ( ( utaui_ice(ji,jj) + utaui_ice(ji-1,jj) ) / 2. )**2 + & |
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| 193 | ( ( vtaui_ice(ji,jj) + vtaui_ice(ji,jj-1) ) / 2. )**2 |
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[825] | 194 | zustm = SQRT( ztair2 ) |
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| 195 | |
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| 196 | ust2s(ji,jj) = ( zustm / rau0 ) * ( rone + sdvt(ji,jj) ) * tms(ji,jj) |
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| 197 | END DO |
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| 198 | END DO |
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| 199 | |
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| 200 | ENDIF |
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| 201 | |
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| 202 | CALL lbc_lnk( ust2s, 'T', 1. ) ! T-point |
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| 203 | |
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[863] | 204 | IF(ln_ctl) THEN ! Control print |
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[867] | 205 | CALL prt_ctl_info(' ') |
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| 206 | CALL prt_ctl_info(' - Cell values : ') |
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| 207 | CALL prt_ctl_info(' ~~~~~~~~~~~~~ ') |
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[863] | 208 | CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :') |
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| 209 | CALL prt_ctl(tab2d_1=divu_i , clinfo1=' lim_dyn : divu_i :') |
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| 210 | CALL prt_ctl(tab2d_1=delta_i , clinfo1=' lim_dyn : delta_i :') |
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| 211 | CALL prt_ctl(tab2d_1=strength , clinfo1=' lim_dyn : strength :') |
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| 212 | CALL prt_ctl(tab2d_1=area , clinfo1=' lim_dyn : cell area :') |
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| 213 | CALL prt_ctl(tab2d_1=at_i , clinfo1=' lim_dyn : at_i :') |
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| 214 | CALL prt_ctl(tab2d_1=vt_i , clinfo1=' lim_dyn : vt_i :') |
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| 215 | CALL prt_ctl(tab2d_1=vt_s , clinfo1=' lim_dyn : vt_s :') |
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| 216 | CALL prt_ctl(tab2d_1=stress1_i , clinfo1=' lim_dyn : stress1_i :') |
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| 217 | CALL prt_ctl(tab2d_1=stress2_i , clinfo1=' lim_dyn : stress2_i :') |
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| 218 | CALL prt_ctl(tab2d_1=stress12_i, clinfo1=' lim_dyn : stress12_i:') |
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| 219 | DO jl = 1, jpl |
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[867] | 220 | CALL prt_ctl_info(' ') |
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[863] | 221 | CALL prt_ctl_info(' - Category : ', ivar1=jl) |
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| 222 | CALL prt_ctl_info(' ~~~~~~~~~~') |
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| 223 | CALL prt_ctl(tab2d_1=a_i (:,:,jl) , clinfo1= ' lim_dyn : a_i : ') |
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| 224 | CALL prt_ctl(tab2d_1=ht_i (:,:,jl) , clinfo1= ' lim_dyn : ht_i : ') |
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| 225 | CALL prt_ctl(tab2d_1=ht_s (:,:,jl) , clinfo1= ' lim_dyn : ht_s : ') |
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| 226 | CALL prt_ctl(tab2d_1=v_i (:,:,jl) , clinfo1= ' lim_dyn : v_i : ') |
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| 227 | CALL prt_ctl(tab2d_1=v_s (:,:,jl) , clinfo1= ' lim_dyn : v_s : ') |
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| 228 | CALL prt_ctl(tab2d_1=e_s (:,:,1,jl) , clinfo1= ' lim_dyn : e_s : ') |
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| 229 | CALL prt_ctl(tab2d_1=t_su (:,:,jl) , clinfo1= ' lim_dyn : t_su : ') |
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| 230 | CALL prt_ctl(tab2d_1=t_s (:,:,1,jl) , clinfo1= ' lim_dyn : t_snow : ') |
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| 231 | CALL prt_ctl(tab2d_1=sm_i (:,:,jl) , clinfo1= ' lim_dyn : sm_i : ') |
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| 232 | CALL prt_ctl(tab2d_1=smv_i (:,:,jl) , clinfo1= ' lim_dyn : smv_i : ') |
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| 233 | DO ja = 1, nlay_i |
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[867] | 234 | CALL prt_ctl_info(' ') |
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[863] | 235 | CALL prt_ctl_info(' - Layer : ', ivar1=ja) |
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| 236 | CALL prt_ctl_info(' ~~~~~~~') |
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| 237 | CALL prt_ctl(tab2d_1=t_i(:,:,ja,jl) , clinfo1= ' lim_dyn : t_i : ') |
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| 238 | CALL prt_ctl(tab2d_1=e_i(:,:,ja,jl) , clinfo1= ' lim_dyn : e_i : ') |
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| 239 | END DO |
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| 240 | END DO |
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[825] | 241 | ENDIF |
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| 242 | |
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| 243 | END SUBROUTINE lim_dyn |
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| 244 | |
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| 245 | SUBROUTINE lim_dyn_init |
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| 246 | !!------------------------------------------------------------------- |
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| 247 | !! *** ROUTINE lim_dyn_init *** |
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| 248 | !! |
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| 249 | !! ** Purpose : Physical constants and parameters linked to the ice |
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| 250 | !! dynamics |
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| 251 | !! |
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| 252 | !! ** Method : Read the namicedyn namelist and check the ice-dynamic |
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| 253 | !! parameter values called at the first timestep (nit000) |
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| 254 | !! |
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| 255 | !! ** input : Namelist namicedyn |
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| 256 | !! |
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| 257 | !! history : |
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| 258 | !! 8.5 ! 03-08 (C. Ethe) original code |
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| 259 | !! 9.0 ! 07-03 (MA Morales Maqueda, S. Bouillon, M. Vancoppenolle) |
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| 260 | !! EVP-Cgrid-LIM3 |
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| 261 | !!------------------------------------------------------------------- |
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| 262 | NAMELIST/namicedyn/ epsd, alpha, & |
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| 263 | & dm, nbiter, nbitdr, om, resl, cw, angvg, pstar, & |
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| 264 | & c_rhg, etamn, creepl, ecc, ahi0, & |
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| 265 | & nevp, telast, alphaevp |
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| 266 | !!------------------------------------------------------------------- |
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| 267 | |
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| 268 | ! Define the initial parameters |
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| 269 | ! ------------------------- |
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| 270 | |
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| 271 | ! Read Namelist namicedyn |
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| 272 | REWIND ( numnam_ice ) |
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| 273 | READ ( numnam_ice , namicedyn ) |
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| 274 | IF(lwp) THEN |
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| 275 | WRITE(numout,*) |
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| 276 | WRITE(numout,*) 'lim_dyn_init : ice parameters for ice dynamics ' |
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| 277 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 278 | WRITE(numout,*) ' tolerance parameter epsd = ', epsd |
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| 279 | WRITE(numout,*) ' coefficient for semi-implicit coriolis alpha = ', alpha |
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| 280 | WRITE(numout,*) ' diffusion constant for dynamics dm = ', dm |
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| 281 | WRITE(numout,*) ' number of sub-time steps for relaxation nbiter = ', nbiter |
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| 282 | WRITE(numout,*) ' maximum number of iterations for relaxation nbitdr = ', nbitdr |
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| 283 | WRITE(numout,*) ' relaxation constant om = ', om |
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| 284 | WRITE(numout,*) ' maximum value for the residual of relaxation resl = ', resl |
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| 285 | WRITE(numout,*) ' drag coefficient for oceanic stress cw = ', cw |
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| 286 | WRITE(numout,*) ' turning angle for oceanic stress angvg = ', angvg |
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| 287 | WRITE(numout,*) ' first bulk-rheology parameter pstar = ', pstar |
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| 288 | WRITE(numout,*) ' second bulk-rhelogy parameter c_rhg = ', c_rhg |
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| 289 | WRITE(numout,*) ' minimun value for viscosity etamn = ', etamn |
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| 290 | WRITE(numout,*) ' creep limit creepl = ', creepl |
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| 291 | WRITE(numout,*) ' eccentricity of the elliptical yield curve ecc = ', ecc |
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| 292 | WRITE(numout,*) ' horizontal diffusivity coeff. for sea-ice ahi0 = ', ahi0 |
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| 293 | WRITE(numout,*) ' number of iterations for subcycling nevp = ', nevp |
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| 294 | WRITE(numout,*) ' timescale for elastic waves telast = ', telast |
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| 295 | WRITE(numout,*) ' coefficient for the solution of int. stresses alphaevp = ', alphaevp |
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| 296 | |
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| 297 | ENDIF |
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| 298 | |
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| 299 | usecc2 = 1.0 / ( ecc * ecc ) |
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| 300 | rhoco = rau0 * cw |
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| 301 | angvg = angvg * rad |
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| 302 | sangvg = SIN( angvg ) |
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| 303 | cangvg = COS( angvg ) |
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| 304 | pstarh = pstar / 2.0 |
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| 305 | |
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| 306 | ! Diffusion coefficients. |
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| 307 | ahiu(:,:) = ahi0 * umask(:,:,1) |
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| 308 | ahiv(:,:) = ahi0 * vmask(:,:,1) |
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| 309 | |
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| 310 | END SUBROUTINE lim_dyn_init |
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| 311 | |
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| 312 | #else |
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| 313 | !!---------------------------------------------------------------------- |
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| 314 | !! Default option Empty module NO LIM sea-ice model |
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| 315 | !!---------------------------------------------------------------------- |
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| 316 | CONTAINS |
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| 317 | SUBROUTINE lim_dyn ! Empty routine |
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| 318 | END SUBROUTINE lim_dyn |
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| 319 | #endif |
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| 320 | |
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| 321 | !!====================================================================== |
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| 322 | END MODULE limdyn |
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