[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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[3625] | 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 ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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[825] | 31 | |
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| 32 | IMPLICIT NONE |
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| 33 | PRIVATE |
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| 34 | |
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[2528] | 35 | PUBLIC lim_dyn ! routine called by ice_step |
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[825] | 36 | |
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[868] | 37 | !! * Substitutions |
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| 38 | # include "vectopt_loop_substitute.h90" |
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[825] | 39 | !!---------------------------------------------------------------------- |
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[3625] | 40 | !! NEMO/LIM3 3.4 , UCL - NEMO Consortium (2011) |
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[1156] | 41 | !! $Id$ |
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[2528] | 42 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[825] | 43 | !!---------------------------------------------------------------------- |
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| 44 | CONTAINS |
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| 45 | |
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[921] | 46 | SUBROUTINE lim_dyn( kt ) |
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[825] | 47 | !!------------------------------------------------------------------- |
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| 48 | !! *** ROUTINE lim_dyn *** |
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| 49 | !! |
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| 50 | !! ** Purpose : compute ice velocity and ocean-ice stress |
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| 51 | !! |
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| 52 | !! ** Method : |
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| 53 | !! |
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| 54 | !! ** Action : - Initialisation |
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| 55 | !! - Call of the dynamic routine for each hemisphere |
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| 56 | !! - computation of the stress at the ocean surface |
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| 57 | !! - treatment of the case if no ice dynamic |
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| 58 | !!------------------------------------------------------------------------------------ |
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[921] | 59 | INTEGER, INTENT(in) :: kt ! number of iteration |
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[2528] | 60 | !! |
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[913] | 61 | INTEGER :: ji, jj, jl, ja ! dummy loop indices |
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| 62 | INTEGER :: i_j1, i_jpj ! Starting/ending j-indices for rheology |
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[2528] | 63 | REAL(wp) :: zcoef ! local scalar |
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[3294] | 64 | REAL(wp), POINTER, DIMENSION(:) :: zind ! i-averaged indicator of sea-ice |
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| 65 | REAL(wp), POINTER, DIMENSION(:) :: zmsk ! i-averaged of tmask |
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| 66 | REAL(wp), POINTER, DIMENSION(:,:) :: zu_io, zv_io ! ice-ocean velocity |
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[825] | 67 | !!--------------------------------------------------------------------- |
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| 68 | |
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[3294] | 69 | CALL wrk_alloc( jpi, jpj, zu_io, zv_io ) |
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| 70 | CALL wrk_alloc( jpj, zind, zmsk ) |
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[825] | 71 | |
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[2715] | 72 | IF( kt == nit000 ) CALL lim_dyn_init ! Initialization (first time-step only) |
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[921] | 73 | |
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[2715] | 74 | IF( ln_limdyn ) THEN |
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| 75 | ! |
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[825] | 76 | old_u_ice(:,:) = u_ice(:,:) * tmu(:,:) |
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| 77 | old_v_ice(:,:) = v_ice(:,:) * tmv(:,:) |
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| 78 | |
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[834] | 79 | ! Rheology (ice dynamics) |
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| 80 | ! ======== |
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[825] | 81 | |
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| 82 | ! Define the j-limits where ice rheology is computed |
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| 83 | ! --------------------------------------------------- |
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| 84 | |
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[2528] | 85 | IF( lk_mpp .OR. lk_mpp_rep ) THEN ! mpp: compute over the whole domain |
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[825] | 86 | i_j1 = 1 |
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| 87 | i_jpj = jpj |
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| 88 | IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj ) |
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| 89 | CALL lim_rhg( i_j1, i_jpj ) |
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| 90 | ELSE ! optimization of the computational area |
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[2715] | 91 | ! |
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[825] | 92 | DO jj = 1, jpj |
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[2715] | 93 | zind(jj) = SUM( 1.0 - at_i(:,jj) ) ! = REAL(jpj) if ocean everywhere on a j-line |
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| 94 | zmsk(jj) = SUM( tmask(:,jj,1) ) ! = 0 if land everywhere on a j-line |
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[825] | 95 | END DO |
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| 96 | |
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| 97 | IF( l_jeq ) THEN ! local domain include both hemisphere |
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| 98 | ! ! Rheology is computed in each hemisphere |
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| 99 | ! ! only over the ice cover latitude strip |
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| 100 | ! Northern hemisphere |
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| 101 | i_j1 = njeq |
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| 102 | i_jpj = jpj |
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| 103 | DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
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| 104 | i_j1 = i_j1 + 1 |
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| 105 | END DO |
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[1103] | 106 | i_j1 = MAX( 1, i_j1-2 ) |
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[825] | 107 | 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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| 108 | CALL lim_rhg( i_j1, i_jpj ) |
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[2715] | 109 | ! |
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[825] | 110 | ! Southern hemisphere |
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| 111 | i_j1 = 1 |
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| 112 | i_jpj = njeq |
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| 113 | DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
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| 114 | i_jpj = i_jpj - 1 |
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| 115 | END DO |
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[1103] | 116 | i_jpj = MIN( jpj, i_jpj+1 ) |
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[825] | 117 | 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] | 118 | ! |
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| 119 | CALL lim_rhg( i_j1, i_jpj ) |
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| 120 | ! |
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| 121 | ELSE ! local domain extends over one hemisphere only |
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| 122 | ! ! Rheology is computed only over the ice cover |
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| 123 | ! ! latitude strip |
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| 124 | i_j1 = 1 |
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[825] | 125 | DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 ) |
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| 126 | i_j1 = i_j1 + 1 |
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| 127 | END DO |
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[1103] | 128 | i_j1 = MAX( 1, i_j1-2 ) |
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[825] | 129 | |
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| 130 | i_jpj = jpj |
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| 131 | DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 ) |
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| 132 | i_jpj = i_jpj - 1 |
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| 133 | END DO |
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[1103] | 134 | i_jpj = MIN( jpj, i_jpj+1) |
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[2715] | 135 | ! |
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[825] | 136 | 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] | 137 | ! |
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[825] | 138 | CALL lim_rhg( i_j1, i_jpj ) |
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[2715] | 139 | ! |
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[825] | 140 | ENDIF |
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[2715] | 141 | ! |
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[825] | 142 | ENDIF |
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| 143 | |
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[888] | 144 | ! computation of friction velocity |
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[913] | 145 | ! -------------------------------- |
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[1470] | 146 | ! 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] | 147 | zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) |
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| 148 | zv_io(:,:) = v_ice(:,:) - ssv_m(:,:) |
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| 149 | ! frictional velocity at T-point |
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[2715] | 150 | zcoef = 0.5_wp * cw |
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[913] | 151 | DO jj = 2, jpjm1 |
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| 152 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2528] | 153 | 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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| 154 | & + 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] | 155 | END DO |
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| 156 | END DO |
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[913] | 157 | ! |
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| 158 | ELSE ! no ice dynamics : transmit directly the atmospheric stress to the ocean |
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| 159 | ! |
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[2715] | 160 | zcoef = SQRT( 0.5_wp ) / rau0 |
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[913] | 161 | DO jj = 2, jpjm1 |
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| 162 | DO ji = fs_2, fs_jpim1 ! vector opt. |
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[2528] | 163 | ust2s(ji,jj) = zcoef * SQRT( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) & |
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| 164 | & + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) * tms(ji,jj) |
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[825] | 165 | END DO |
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| 166 | END DO |
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[913] | 167 | ! |
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[825] | 168 | ENDIF |
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| 169 | CALL lbc_lnk( ust2s, 'T', 1. ) ! T-point |
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| 170 | |
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[863] | 171 | IF(ln_ctl) THEN ! Control print |
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[867] | 172 | CALL prt_ctl_info(' ') |
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| 173 | CALL prt_ctl_info(' - Cell values : ') |
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| 174 | CALL prt_ctl_info(' ~~~~~~~~~~~~~ ') |
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[863] | 175 | CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :') |
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| 176 | CALL prt_ctl(tab2d_1=divu_i , clinfo1=' lim_dyn : divu_i :') |
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| 177 | CALL prt_ctl(tab2d_1=delta_i , clinfo1=' lim_dyn : delta_i :') |
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| 178 | CALL prt_ctl(tab2d_1=strength , clinfo1=' lim_dyn : strength :') |
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| 179 | CALL prt_ctl(tab2d_1=area , clinfo1=' lim_dyn : cell area :') |
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| 180 | CALL prt_ctl(tab2d_1=at_i , clinfo1=' lim_dyn : at_i :') |
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| 181 | CALL prt_ctl(tab2d_1=vt_i , clinfo1=' lim_dyn : vt_i :') |
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| 182 | CALL prt_ctl(tab2d_1=vt_s , clinfo1=' lim_dyn : vt_s :') |
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| 183 | CALL prt_ctl(tab2d_1=stress1_i , clinfo1=' lim_dyn : stress1_i :') |
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| 184 | CALL prt_ctl(tab2d_1=stress2_i , clinfo1=' lim_dyn : stress2_i :') |
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| 185 | CALL prt_ctl(tab2d_1=stress12_i, clinfo1=' lim_dyn : stress12_i:') |
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| 186 | DO jl = 1, jpl |
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[867] | 187 | CALL prt_ctl_info(' ') |
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[863] | 188 | CALL prt_ctl_info(' - Category : ', ivar1=jl) |
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| 189 | CALL prt_ctl_info(' ~~~~~~~~~~') |
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| 190 | CALL prt_ctl(tab2d_1=a_i (:,:,jl) , clinfo1= ' lim_dyn : a_i : ') |
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| 191 | CALL prt_ctl(tab2d_1=ht_i (:,:,jl) , clinfo1= ' lim_dyn : ht_i : ') |
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| 192 | CALL prt_ctl(tab2d_1=ht_s (:,:,jl) , clinfo1= ' lim_dyn : ht_s : ') |
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| 193 | CALL prt_ctl(tab2d_1=v_i (:,:,jl) , clinfo1= ' lim_dyn : v_i : ') |
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| 194 | CALL prt_ctl(tab2d_1=v_s (:,:,jl) , clinfo1= ' lim_dyn : v_s : ') |
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| 195 | CALL prt_ctl(tab2d_1=e_s (:,:,1,jl) , clinfo1= ' lim_dyn : e_s : ') |
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| 196 | CALL prt_ctl(tab2d_1=t_su (:,:,jl) , clinfo1= ' lim_dyn : t_su : ') |
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| 197 | CALL prt_ctl(tab2d_1=t_s (:,:,1,jl) , clinfo1= ' lim_dyn : t_snow : ') |
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| 198 | CALL prt_ctl(tab2d_1=sm_i (:,:,jl) , clinfo1= ' lim_dyn : sm_i : ') |
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| 199 | CALL prt_ctl(tab2d_1=smv_i (:,:,jl) , clinfo1= ' lim_dyn : smv_i : ') |
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| 200 | DO ja = 1, nlay_i |
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[867] | 201 | CALL prt_ctl_info(' ') |
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[863] | 202 | CALL prt_ctl_info(' - Layer : ', ivar1=ja) |
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| 203 | CALL prt_ctl_info(' ~~~~~~~') |
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| 204 | CALL prt_ctl(tab2d_1=t_i(:,:,ja,jl) , clinfo1= ' lim_dyn : t_i : ') |
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| 205 | CALL prt_ctl(tab2d_1=e_i(:,:,ja,jl) , clinfo1= ' lim_dyn : e_i : ') |
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| 206 | END DO |
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| 207 | END DO |
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[825] | 208 | ENDIF |
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[2528] | 209 | ! |
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[3294] | 210 | CALL wrk_dealloc( jpi, jpj, zu_io, zv_io ) |
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| 211 | CALL wrk_dealloc( jpj, zind, zmsk ) |
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[2715] | 212 | ! |
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[825] | 213 | END SUBROUTINE lim_dyn |
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| 214 | |
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[2528] | 215 | |
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[921] | 216 | SUBROUTINE lim_dyn_init |
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[825] | 217 | !!------------------------------------------------------------------- |
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| 218 | !! *** ROUTINE lim_dyn_init *** |
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| 219 | !! |
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| 220 | !! ** Purpose : Physical constants and parameters linked to the ice |
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| 221 | !! dynamics |
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| 222 | !! |
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| 223 | !! ** Method : Read the namicedyn namelist and check the ice-dynamic |
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| 224 | !! parameter values called at the first timestep (nit000) |
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| 225 | !! |
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| 226 | !! ** input : Namelist namicedyn |
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| 227 | !!------------------------------------------------------------------- |
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| 228 | NAMELIST/namicedyn/ epsd, alpha, & |
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| 229 | & dm, nbiter, nbitdr, om, resl, cw, angvg, pstar, & |
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| 230 | & c_rhg, etamn, creepl, ecc, ahi0, & |
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| 231 | & nevp, telast, alphaevp |
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| 232 | !!------------------------------------------------------------------- |
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| 233 | |
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[2528] | 234 | REWIND( numnam_ice ) ! Read Namelist namicedyn |
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| 235 | READ ( numnam_ice , namicedyn ) |
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| 236 | |
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| 237 | IF(lwp) THEN ! control print |
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[825] | 238 | WRITE(numout,*) |
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| 239 | WRITE(numout,*) 'lim_dyn_init : ice parameters for ice dynamics ' |
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| 240 | WRITE(numout,*) '~~~~~~~~~~~~' |
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| 241 | WRITE(numout,*) ' tolerance parameter epsd = ', epsd |
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| 242 | WRITE(numout,*) ' coefficient for semi-implicit coriolis alpha = ', alpha |
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| 243 | WRITE(numout,*) ' diffusion constant for dynamics dm = ', dm |
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| 244 | WRITE(numout,*) ' number of sub-time steps for relaxation nbiter = ', nbiter |
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| 245 | WRITE(numout,*) ' maximum number of iterations for relaxation nbitdr = ', nbitdr |
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| 246 | WRITE(numout,*) ' relaxation constant om = ', om |
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| 247 | WRITE(numout,*) ' maximum value for the residual of relaxation resl = ', resl |
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| 248 | WRITE(numout,*) ' drag coefficient for oceanic stress cw = ', cw |
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| 249 | WRITE(numout,*) ' turning angle for oceanic stress angvg = ', angvg |
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| 250 | WRITE(numout,*) ' first bulk-rheology parameter pstar = ', pstar |
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| 251 | WRITE(numout,*) ' second bulk-rhelogy parameter c_rhg = ', c_rhg |
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| 252 | WRITE(numout,*) ' minimun value for viscosity etamn = ', etamn |
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| 253 | WRITE(numout,*) ' creep limit creepl = ', creepl |
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| 254 | WRITE(numout,*) ' eccentricity of the elliptical yield curve ecc = ', ecc |
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| 255 | WRITE(numout,*) ' horizontal diffusivity coeff. for sea-ice ahi0 = ', ahi0 |
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| 256 | WRITE(numout,*) ' number of iterations for subcycling nevp = ', nevp |
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| 257 | WRITE(numout,*) ' timescale for elastic waves telast = ', telast |
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| 258 | WRITE(numout,*) ' coefficient for the solution of int. stresses alphaevp = ', alphaevp |
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| 259 | ENDIF |
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[2528] | 260 | ! |
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| 261 | IF( angvg /= 0._wp ) THEN |
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| 262 | CALL ctl_warn( 'lim_dyn_init: turning angle for oceanic stress not properly coded for EVP ', & |
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| 263 | & '(see limsbc module). We force angvg = 0._wp' ) |
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| 264 | angvg = 0._wp |
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| 265 | ENDIF |
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| 266 | |
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| 267 | usecc2 = 1._wp / ( ecc * ecc ) |
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| 268 | rhoco = rau0 * cw |
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[825] | 269 | angvg = angvg * rad |
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| 270 | sangvg = SIN( angvg ) |
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| 271 | cangvg = COS( angvg ) |
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[2528] | 272 | pstarh = pstar * 0.5_wp |
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[825] | 273 | |
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| 274 | ! Diffusion coefficients. |
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| 275 | ahiu(:,:) = ahi0 * umask(:,:,1) |
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| 276 | ahiv(:,:) = ahi0 * vmask(:,:,1) |
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[2715] | 277 | ! |
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[825] | 278 | END SUBROUTINE lim_dyn_init |
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| 279 | |
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| 280 | #else |
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| 281 | !!---------------------------------------------------------------------- |
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| 282 | !! Default option Empty module NO LIM sea-ice model |
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| 283 | !!---------------------------------------------------------------------- |
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| 284 | CONTAINS |
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| 285 | SUBROUTINE lim_dyn ! Empty routine |
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| 286 | END SUBROUTINE lim_dyn |
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| 287 | #endif |
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| 288 | |
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| 289 | !!====================================================================== |
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| 290 | END MODULE limdyn |
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