[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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| 8 | !! 4.0 ! 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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[4045] | 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 par_ice ! LIM-3 parameters |
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| 23 | USE dom_ice ! LIM-3 domain |
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| 24 | USE limrhg ! LIM-3 rheology |
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| 25 | USE lbclnk ! lateral boundary conditions - MPP exchanges |
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| 26 | USE lib_mpp ! MPP library |
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| 27 | USE wrk_nemo ! work arrays |
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| 28 | USE in_out_manager ! I/O manager |
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| 29 | USE prtctl ! Print control |
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| 30 | USE lib_fortran ! glob_sum |
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[4072] | 31 | USE timing ! Timing |
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[825] | 32 | |
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| 33 | IMPLICIT NONE |
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| 34 | PRIVATE |
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| 35 | |
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[2528] | 36 | PUBLIC lim_dyn ! routine called by ice_step |
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[825] | 37 | |
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[868] | 38 | !! * Substitutions |
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| 39 | # include "vectopt_loop_substitute.h90" |
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[825] | 40 | !!---------------------------------------------------------------------- |
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[4045] | 41 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
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[1156] | 42 | !! $Id$ |
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[2528] | 43 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[825] | 44 | !!---------------------------------------------------------------------- |
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| 45 | CONTAINS |
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| 46 | |
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[921] | 47 | SUBROUTINE lim_dyn( kt ) |
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[825] | 48 | !!------------------------------------------------------------------- |
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| 49 | !! *** ROUTINE lim_dyn *** |
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| 50 | !! |
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| 51 | !! ** Purpose : compute ice velocity and ocean-ice stress |
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| 52 | !! |
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| 53 | !! ** Method : |
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| 54 | !! |
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| 55 | !! ** Action : - Initialisation |
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| 56 | !! - Call of the dynamic routine for each hemisphere |
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| 57 | !! - computation of the stress at the ocean surface |
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| 58 | !! - treatment of the case if no ice dynamic |
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| 59 | !!------------------------------------------------------------------------------------ |
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[921] | 60 | INTEGER, INTENT(in) :: kt ! number of iteration |
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[2528] | 61 | !! |
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[913] | 62 | INTEGER :: ji, jj, jl, ja ! dummy loop indices |
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| 63 | INTEGER :: i_j1, i_jpj ! Starting/ending j-indices for rheology |
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[2528] | 64 | REAL(wp) :: zcoef ! local scalar |
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[3294] | 65 | REAL(wp), POINTER, DIMENSION(:) :: zind ! i-averaged indicator of sea-ice |
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| 66 | REAL(wp), POINTER, DIMENSION(:) :: zmsk ! i-averaged of tmask |
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| 67 | REAL(wp), POINTER, DIMENSION(:,:) :: zu_io, zv_io ! ice-ocean velocity |
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[4045] | 68 | REAL(wp) :: zchk_v_i, zchk_smv, zchk_fs, zchk_fw, zchk_v_i_b, zchk_smv_b, zchk_fs_b, zchk_fw_b ! Check conservation (C Rousset) |
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| 69 | REAL(wp) :: zchk_vmin, zchk_amin, zchk_amax ! Check errors (C Rousset) |
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| 70 | !!--------------------------------------------------------------------- |
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[825] | 71 | |
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[4072] | 72 | IF( nn_timing == 1 ) CALL timing_start('limdyn') |
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| 73 | |
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[3294] | 74 | CALL wrk_alloc( jpi, jpj, zu_io, zv_io ) |
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| 75 | CALL wrk_alloc( jpj, zind, zmsk ) |
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[825] | 76 | |
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[4045] | 77 | ! ------------------------------- |
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| 78 | !- check conservation (C Rousset) |
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| 79 | IF (ln_limdiahsb) THEN |
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| 80 | zchk_v_i_b = glob_sum( SUM( v_i(:,:,:), dim=3 ) * area(:,:) * tms(:,:) ) |
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| 81 | zchk_smv_b = glob_sum( SUM( smv_i(:,:,:), dim=3 ) * area(:,:) * tms(:,:) ) |
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| 82 | zchk_fw_b = glob_sum( rdm_ice(:,:) * area(:,:) * tms(:,:) ) |
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| 83 | zchk_fs_b = glob_sum( ( sfx_bri(:,:) + sfx_thd(:,:) + sfx_res(:,:) + sfx_mec(:,:) ) * area(:,:) * tms(:,:) ) |
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| 84 | ENDIF |
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| 85 | !- check conservation (C Rousset) |
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| 86 | ! ------------------------------- |
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| 87 | |
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[2715] | 88 | IF( kt == nit000 ) CALL lim_dyn_init ! Initialization (first time-step only) |
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[921] | 89 | |
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[2715] | 90 | IF( ln_limdyn ) THEN |
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| 91 | ! |
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[825] | 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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[2528] | 101 | IF( lk_mpp .OR. lk_mpp_rep ) 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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[2715] | 107 | ! |
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[825] | 108 | DO jj = 1, jpj |
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[2715] | 109 | zind(jj) = SUM( 1.0 - at_i(:,jj) ) ! = REAL(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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[825] | 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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[1103] | 122 | i_j1 = MAX( 1, i_j1-2 ) |
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[825] | 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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[2715] | 125 | ! |
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[825] | 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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[1103] | 132 | i_jpj = MIN( jpj, i_jpj+1 ) |
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[825] | 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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[2715] | 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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[825] | 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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[1103] | 144 | i_j1 = MAX( 1, i_j1-2 ) |
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[825] | 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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[1103] | 150 | i_jpj = MIN( jpj, i_jpj+1) |
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[2715] | 151 | ! |
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[825] | 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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[2715] | 153 | ! |
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[825] | 154 | CALL lim_rhg( i_j1, i_jpj ) |
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[2715] | 155 | ! |
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[825] | 156 | ENDIF |
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[2715] | 157 | ! |
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[825] | 158 | ENDIF |
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| 159 | |
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[888] | 160 | ! computation of friction velocity |
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[913] | 161 | ! -------------------------------- |
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[1470] | 162 | ! 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] | 163 | zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) |
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| 164 | zv_io(:,:) = v_ice(:,:) - ssv_m(:,:) |
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| 165 | ! frictional velocity at T-point |
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[2715] | 166 | zcoef = 0.5_wp * cw |
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[913] | 167 | DO jj = 2, jpjm1 |
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| 168 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2528] | 169 | 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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| 170 | & + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) * tms(ji,jj) |
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[825] | 171 | END DO |
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| 172 | END DO |
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[913] | 173 | ! |
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| 174 | ELSE ! no ice dynamics : transmit directly the atmospheric stress to the ocean |
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| 175 | ! |
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[2715] | 176 | zcoef = SQRT( 0.5_wp ) / rau0 |
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[913] | 177 | DO jj = 2, jpjm1 |
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| 178 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2528] | 179 | ust2s(ji,jj) = zcoef * SQRT( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & |
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| 180 | & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) * tms(ji,jj) |
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[825] | 181 | END DO |
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| 182 | END DO |
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[913] | 183 | ! |
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[825] | 184 | ENDIF |
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| 185 | CALL lbc_lnk( ust2s, 'T', 1. ) ! T-point |
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| 186 | |
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[863] | 187 | IF(ln_ctl) THEN ! Control print |
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[867] | 188 | CALL prt_ctl_info(' ') |
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| 189 | CALL prt_ctl_info(' - Cell values : ') |
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| 190 | CALL prt_ctl_info(' ~~~~~~~~~~~~~ ') |
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[863] | 191 | CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :') |
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| 192 | CALL prt_ctl(tab2d_1=divu_i , clinfo1=' lim_dyn : divu_i :') |
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| 193 | CALL prt_ctl(tab2d_1=delta_i , clinfo1=' lim_dyn : delta_i :') |
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| 194 | CALL prt_ctl(tab2d_1=strength , clinfo1=' lim_dyn : strength :') |
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| 195 | CALL prt_ctl(tab2d_1=area , clinfo1=' lim_dyn : cell area :') |
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| 196 | CALL prt_ctl(tab2d_1=at_i , clinfo1=' lim_dyn : at_i :') |
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| 197 | CALL prt_ctl(tab2d_1=vt_i , clinfo1=' lim_dyn : vt_i :') |
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| 198 | CALL prt_ctl(tab2d_1=vt_s , clinfo1=' lim_dyn : vt_s :') |
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| 199 | CALL prt_ctl(tab2d_1=stress1_i , clinfo1=' lim_dyn : stress1_i :') |
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| 200 | CALL prt_ctl(tab2d_1=stress2_i , clinfo1=' lim_dyn : stress2_i :') |
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| 201 | CALL prt_ctl(tab2d_1=stress12_i, clinfo1=' lim_dyn : stress12_i:') |
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| 202 | DO jl = 1, jpl |
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[867] | 203 | CALL prt_ctl_info(' ') |
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[863] | 204 | CALL prt_ctl_info(' - Category : ', ivar1=jl) |
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| 205 | CALL prt_ctl_info(' ~~~~~~~~~~') |
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| 206 | CALL prt_ctl(tab2d_1=a_i (:,:,jl) , clinfo1= ' lim_dyn : a_i : ') |
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| 207 | CALL prt_ctl(tab2d_1=ht_i (:,:,jl) , clinfo1= ' lim_dyn : ht_i : ') |
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| 208 | CALL prt_ctl(tab2d_1=ht_s (:,:,jl) , clinfo1= ' lim_dyn : ht_s : ') |
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| 209 | CALL prt_ctl(tab2d_1=v_i (:,:,jl) , clinfo1= ' lim_dyn : v_i : ') |
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| 210 | CALL prt_ctl(tab2d_1=v_s (:,:,jl) , clinfo1= ' lim_dyn : v_s : ') |
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| 211 | CALL prt_ctl(tab2d_1=e_s (:,:,1,jl) , clinfo1= ' lim_dyn : e_s : ') |
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| 212 | CALL prt_ctl(tab2d_1=t_su (:,:,jl) , clinfo1= ' lim_dyn : t_su : ') |
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| 213 | CALL prt_ctl(tab2d_1=t_s (:,:,1,jl) , clinfo1= ' lim_dyn : t_snow : ') |
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| 214 | CALL prt_ctl(tab2d_1=sm_i (:,:,jl) , clinfo1= ' lim_dyn : sm_i : ') |
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| 215 | CALL prt_ctl(tab2d_1=smv_i (:,:,jl) , clinfo1= ' lim_dyn : smv_i : ') |
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| 216 | DO ja = 1, nlay_i |
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[867] | 217 | CALL prt_ctl_info(' ') |
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[863] | 218 | CALL prt_ctl_info(' - Layer : ', ivar1=ja) |
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| 219 | CALL prt_ctl_info(' ~~~~~~~') |
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| 220 | CALL prt_ctl(tab2d_1=t_i(:,:,ja,jl) , clinfo1= ' lim_dyn : t_i : ') |
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| 221 | CALL prt_ctl(tab2d_1=e_i(:,:,ja,jl) , clinfo1= ' lim_dyn : e_i : ') |
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| 222 | END DO |
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| 223 | END DO |
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[825] | 224 | ENDIF |
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[2528] | 225 | ! |
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[4045] | 226 | ! ------------------------------- |
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| 227 | !- check conservation (C Rousset) |
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| 228 | IF (ln_limdiahsb) THEN |
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| 229 | zchk_fs = glob_sum( ( sfx_bri(:,:) + sfx_thd(:,:) + sfx_res(:,:) + sfx_mec(:,:) ) * area(:,:) * tms(:,:) ) - zchk_fs_b |
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| 230 | zchk_fw = glob_sum( rdm_ice(:,:) * area(:,:) * tms(:,:) ) - zchk_fw_b |
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| 231 | |
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| 232 | zchk_v_i = ( glob_sum( SUM( v_i(:,:,:), dim=3 ) * area(:,:) * tms(:,:) ) - zchk_v_i_b - ( zchk_fw / rhoic ) ) / rdt_ice |
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| 233 | zchk_smv = ( glob_sum( SUM( smv_i(:,:,:), dim=3 ) * area(:,:) * tms(:,:) ) - zchk_smv_b ) / rdt_ice + ( zchk_fs / rhoic ) |
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| 234 | |
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| 235 | zchk_vmin = glob_min(v_i) |
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| 236 | zchk_amax = glob_max(SUM(a_i,dim=3)) |
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| 237 | zchk_amin = glob_min(a_i) |
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| 238 | |
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| 239 | IF(lwp) THEN |
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| 240 | IF ( ABS( zchk_v_i ) > 1.e-5 ) WRITE(numout,*) 'violation volume [m3/day] (limdyn) = ',(zchk_v_i * rday) |
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| 241 | IF ( ABS( zchk_smv ) > 1.e-4 ) WRITE(numout,*) 'violation saline [psu*m3/day] (limdyn) = ',(zchk_smv * rday) |
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| 242 | IF ( zchk_vmin < 0. ) WRITE(numout,*) 'violation v_i<0 [mm] (limdyn) = ',(zchk_vmin * 1.e-3) |
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| 243 | !IF ( zchk_amax > amax+1.e-10 ) WRITE(numout,*) 'violation a_i>amax (limdyn) = ',zchk_amax |
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| 244 | IF ( zchk_amin < 0. ) WRITE(numout,*) 'violation a_i<0 (limdyn) = ',zchk_amin |
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| 245 | ENDIF |
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| 246 | ENDIF |
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| 247 | !- check conservation (C Rousset) |
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| 248 | ! ------------------------------- |
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| 249 | |
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[3294] | 250 | CALL wrk_dealloc( jpi, jpj, zu_io, zv_io ) |
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| 251 | CALL wrk_dealloc( jpj, zind, zmsk ) |
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[2715] | 252 | ! |
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[4072] | 253 | IF( nn_timing == 1 ) CALL timing_stop('limdyn') |
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| 254 | |
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[825] | 255 | END SUBROUTINE lim_dyn |
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| 256 | |
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[2528] | 257 | |
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[921] | 258 | SUBROUTINE lim_dyn_init |
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[825] | 259 | !!------------------------------------------------------------------- |
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| 260 | !! *** ROUTINE lim_dyn_init *** |
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| 261 | !! |
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| 262 | !! ** Purpose : Physical constants and parameters linked to the ice |
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| 263 | !! dynamics |
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| 264 | !! |
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| 265 | !! ** Method : Read the namicedyn namelist and check the ice-dynamic |
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| 266 | !! parameter values called at the first timestep (nit000) |
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| 267 | !! |
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| 268 | !! ** input : Namelist namicedyn |
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| 269 | !!------------------------------------------------------------------- |
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| 270 | NAMELIST/namicedyn/ epsd, alpha, & |
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| 271 | & dm, nbiter, nbitdr, om, resl, cw, angvg, pstar, & |
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| 272 | & c_rhg, etamn, creepl, ecc, ahi0, & |
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[4045] | 273 | & nevp, telast, alphaevp, hminrhg |
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[825] | 274 | !!------------------------------------------------------------------- |
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| 275 | |
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[2528] | 276 | REWIND( numnam_ice ) ! Read Namelist namicedyn |
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| 277 | READ ( numnam_ice , namicedyn ) |
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| 278 | |
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| 279 | IF(lwp) THEN ! control print |
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[825] | 280 | WRITE(numout,*) |
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| 281 | WRITE(numout,*) 'lim_dyn_init : ice parameters for ice dynamics ' |
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| 282 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 283 | WRITE(numout,*) ' tolerance parameter epsd = ', epsd |
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| 284 | WRITE(numout,*) ' coefficient for semi-implicit coriolis alpha = ', alpha |
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| 285 | WRITE(numout,*) ' diffusion constant for dynamics dm = ', dm |
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| 286 | WRITE(numout,*) ' number of sub-time steps for relaxation nbiter = ', nbiter |
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| 287 | WRITE(numout,*) ' maximum number of iterations for relaxation nbitdr = ', nbitdr |
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| 288 | WRITE(numout,*) ' relaxation constant om = ', om |
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| 289 | WRITE(numout,*) ' maximum value for the residual of relaxation resl = ', resl |
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| 290 | WRITE(numout,*) ' drag coefficient for oceanic stress cw = ', cw |
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| 291 | WRITE(numout,*) ' turning angle for oceanic stress angvg = ', angvg |
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| 292 | WRITE(numout,*) ' first bulk-rheology parameter pstar = ', pstar |
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| 293 | WRITE(numout,*) ' second bulk-rhelogy parameter c_rhg = ', c_rhg |
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| 294 | WRITE(numout,*) ' minimun value for viscosity etamn = ', etamn |
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| 295 | WRITE(numout,*) ' creep limit creepl = ', creepl |
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| 296 | WRITE(numout,*) ' eccentricity of the elliptical yield curve ecc = ', ecc |
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| 297 | WRITE(numout,*) ' horizontal diffusivity coeff. for sea-ice ahi0 = ', ahi0 |
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| 298 | WRITE(numout,*) ' number of iterations for subcycling nevp = ', nevp |
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| 299 | WRITE(numout,*) ' timescale for elastic waves telast = ', telast |
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| 300 | WRITE(numout,*) ' coefficient for the solution of int. stresses alphaevp = ', alphaevp |
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[4045] | 301 | WRITE(numout,*) ' min ice thickness for rheology calculations hminrhg = ', hminrhg |
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[825] | 302 | ENDIF |
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[2528] | 303 | ! |
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| 304 | IF( angvg /= 0._wp ) THEN |
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| 305 | CALL ctl_warn( 'lim_dyn_init: turning angle for oceanic stress not properly coded for EVP ', & |
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| 306 | & '(see limsbc module). We force angvg = 0._wp' ) |
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| 307 | angvg = 0._wp |
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| 308 | ENDIF |
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| 309 | |
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| 310 | usecc2 = 1._wp / ( ecc * ecc ) |
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| 311 | rhoco = rau0 * cw |
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[825] | 312 | angvg = angvg * rad |
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| 313 | sangvg = SIN( angvg ) |
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| 314 | cangvg = COS( angvg ) |
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[2528] | 315 | pstarh = pstar * 0.5_wp |
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[825] | 316 | |
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| 317 | ! Diffusion coefficients. |
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| 318 | ahiu(:,:) = ahi0 * umask(:,:,1) |
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| 319 | ahiv(:,:) = ahi0 * vmask(:,:,1) |
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[2715] | 320 | ! |
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[825] | 321 | END SUBROUTINE lim_dyn_init |
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| 322 | |
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| 323 | #else |
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| 324 | !!---------------------------------------------------------------------- |
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| 325 | !! Default option Empty module NO LIM sea-ice model |
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| 326 | !!---------------------------------------------------------------------- |
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| 327 | CONTAINS |
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| 328 | SUBROUTINE lim_dyn ! Empty routine |
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| 329 | END SUBROUTINE lim_dyn |
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| 330 | #endif |
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| 331 | |
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| 332 | !!====================================================================== |
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| 333 | END MODULE limdyn |
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