[825] | 1 | MODULE limthd_sal |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE limthd_sal *** |
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[2528] | 4 | !! LIM-3 sea-ice : computation of salinity variations in the ice |
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[825] | 5 | !!====================================================================== |
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[2528] | 6 | !! History : - ! 2003-05 (M. Vancoppenolle) UCL-ASTR first coding for LIM3-1D |
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| 7 | !! 3.0 ! 2005-12 (M. Vancoppenolle) adapted to the 3-D version |
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[2715] | 8 | !! 4.0 ! 2011-02 (G. Madec) dynamical allocation |
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[2528] | 9 | !!--------------------------------------------------------------------- |
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[888] | 10 | #if defined key_lim3 |
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[825] | 11 | !!---------------------------------------------------------------------- |
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[2528] | 12 | !! 'key_lim3' LIM-3 sea-ice model |
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| 13 | !!---------------------------------------------------------------------- |
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[3625] | 14 | !! lim_thd_sal : salinity variations in the ice |
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[2528] | 15 | !!---------------------------------------------------------------------- |
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[3625] | 16 | USE par_oce ! ocean parameters |
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| 17 | USE phycst ! physical constants (ocean directory) |
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| 18 | USE sbc_oce ! Surface boundary condition: ocean fields |
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| 19 | USE ice ! LIM variables |
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| 20 | USE par_ice ! LIM parameters |
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| 21 | USE thd_ice ! LIM thermodynamics |
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| 22 | USE limvar ! LIM variables |
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| 23 | USE in_out_manager ! I/O manager |
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| 24 | USE lib_mpp ! MPP library |
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| 25 | USE wrk_nemo ! work arrays |
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| 26 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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[825] | 27 | |
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| 28 | IMPLICIT NONE |
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| 29 | PRIVATE |
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| 30 | |
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[2528] | 31 | PUBLIC lim_thd_sal ! called by limthd module |
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| 32 | PUBLIC lim_thd_sal_init ! called by iceini module |
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[825] | 33 | |
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[1156] | 34 | !!---------------------------------------------------------------------- |
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[3625] | 35 | !! NEMO/LIM3 3.4 , UCL - NEMO Consortium (2011) |
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[1156] | 36 | !! $Id$ |
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[2528] | 37 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[1156] | 38 | !!---------------------------------------------------------------------- |
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[921] | 39 | CONTAINS |
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[825] | 40 | |
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[2528] | 41 | SUBROUTINE lim_thd_sal( kideb, kiut ) |
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[825] | 42 | !!------------------------------------------------------------------- |
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[2528] | 43 | !! *** ROUTINE lim_thd_sal *** |
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| 44 | !! |
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| 45 | !! ** Purpose : computes new salinities in the ice |
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[825] | 46 | !! |
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[3625] | 47 | !! ** Method : 3 possibilities |
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| 48 | !! -> num_sal = 1 -> Sice = cst [ice salinity constant in both time & space] |
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| 49 | !! -> num_sal = 2 -> Sice = S(z,t) [Vancoppenolle et al. 2005] |
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| 50 | !! -> num_sal = 3 -> Sice = S(z) [multiyear ice] |
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[825] | 51 | !!--------------------------------------------------------------------- |
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[3625] | 52 | INTEGER, INTENT(in) :: kideb, kiut ! thickness category index |
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[2528] | 53 | ! |
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| 54 | INTEGER :: ji, jk ! dummy loop indices |
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[2715] | 55 | REAL(wp) :: zsold, iflush, iaccrbo, igravdr, isnowic, i_ice_switch, ztmelts ! local scalars |
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[2528] | 56 | REAL(wp) :: zaaa, zbbb, zccc, zdiscrim ! local scalars |
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[2715] | 57 | REAL(wp), POINTER, DIMENSION(:) :: ze_init, zhiold, zsiold |
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[2528] | 58 | !!--------------------------------------------------------------------- |
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[825] | 59 | |
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[3294] | 60 | CALL wrk_alloc( jpij, ze_init, zhiold, zsiold ) |
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[825] | 61 | |
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[921] | 62 | !------------------------------------------------------------------------------| |
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| 63 | ! 1) Constant salinity, constant in time | |
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| 64 | !------------------------------------------------------------------------------| |
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[3625] | 65 | !!gm comment: if num_sal = 1 s_i_new, s_i_b and sm_i_b can be set to bulk_sal one for all in the initialisation phase !! |
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| 66 | !!gm ===>>> simplification of almost all test on num_sal value |
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| 67 | IF( num_sal == 1 ) THEN |
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| 68 | s_i_b (kideb:kiut,1:nlay_i) = bulk_sal |
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| 69 | sm_i_b (kideb:kiut) = bulk_sal |
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| 70 | s_i_new(kideb:kiut) = bulk_sal |
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[2528] | 71 | ENDIF |
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[825] | 72 | |
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[921] | 73 | !------------------------------------------------------------------------------| |
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| 74 | ! Module 2 : Constant salinity varying in time | |
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| 75 | !------------------------------------------------------------------------------| |
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[825] | 76 | |
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[3625] | 77 | IF( num_sal == 2 ) THEN |
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[825] | 78 | |
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| 79 | !--------------------------------- |
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| 80 | ! Thickness at previous time step |
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| 81 | !--------------------------------- |
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| 82 | DO ji = kideb, kiut |
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[2715] | 83 | zhiold(ji) = ht_i_b(ji) - dh_i_bott(ji) - dh_snowice(ji) - dh_i_surf(ji) |
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| 84 | END DO |
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[825] | 85 | |
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| 86 | !--------------------- |
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| 87 | ! Global heat content |
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| 88 | !--------------------- |
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[2715] | 89 | ze_init(:) = 0._wp |
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[825] | 90 | DO jk = 1, nlay_i |
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| 91 | DO ji = kideb, kiut |
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| 92 | ze_init(ji) = ze_init(ji) + q_i_b(ji,jk) * ht_i_b(ji) / nlay_i |
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[2715] | 93 | END DO |
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| 94 | END DO |
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[825] | 95 | |
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| 96 | DO ji = kideb, kiut |
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[2715] | 97 | ! |
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[825] | 98 | ! Switches |
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| 99 | !---------- |
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[2715] | 100 | iflush = MAX( 0._wp , SIGN( 1.0 , t_su_b(ji) - rtt ) ) ! =1 if summer |
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| 101 | igravdr = MAX( 0._wp , SIGN( 1.0 , t_bo_b(ji) - t_su_b(ji) ) ) ! =1 if t_su < t_bo |
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| 102 | iaccrbo = MAX( 0._wp , SIGN( 1.0 , dh_i_bott(ji) ) ) ! =1 if bottom accretion |
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| 103 | i_ice_switch = 1._wp - MAX ( 0._wp , SIGN( 1._wp , - ht_i_b(ji) + 1.e-2 ) ) |
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| 104 | isnowic = 1._wp - MAX ( 0._wp , SIGN( 1._wp , - dh_snowice(ji) ) ) * i_ice_switch ! =1 if snow ice formation |
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[825] | 105 | |
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| 106 | !--------------------- |
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| 107 | ! Salinity tendencies |
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| 108 | !--------------------- |
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[2715] | 109 | ! ! drainage by gravity drainage |
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[2528] | 110 | dsm_i_gd_1d(ji) = - igravdr * MAX( sm_i_b(ji) - sal_G , 0._wp ) / time_G * rdt_ice |
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[2715] | 111 | ! ! drainage by flushing |
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[3625] | 112 | dsm_i_fl_1d(ji) = - iflush * MAX( sm_i_b(ji) - sal_F , 0._wp ) / time_F * rdt_ice |
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[825] | 113 | |
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| 114 | !----------------- |
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| 115 | ! Update salinity |
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| 116 | !----------------- |
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| 117 | ! only drainage terms ( gravity drainage and flushing ) |
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[2715] | 118 | ! snow ice / bottom sources are added in lim_thd_ent to conserve energy |
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[825] | 119 | zsiold(ji) = sm_i_b(ji) |
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[2528] | 120 | sm_i_b(ji) = sm_i_b(ji) + dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji) |
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[825] | 121 | |
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[2715] | 122 | ! if no ice, salinity = 0.1 |
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[2528] | 123 | i_ice_switch = 1._wp - MAX ( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) ) |
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[2715] | 124 | sm_i_b(ji) = i_ice_switch * sm_i_b(ji) + s_i_min * ( 1._wp - i_ice_switch ) |
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[825] | 125 | END DO ! ji |
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| 126 | |
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[3625] | 127 | CALL lim_var_salprof1d( kideb, kiut ) ! Salinity profile |
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[825] | 128 | |
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[3625] | 129 | |
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[825] | 130 | !---------------------------- |
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| 131 | ! Heat flux - brine drainage |
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| 132 | !---------------------------- |
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| 133 | |
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| 134 | DO ji = kideb, kiut |
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[2715] | 135 | !!gm useless |
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[825] | 136 | ! iflush : 1 if summer |
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[3625] | 137 | iflush = MAX( 0._wp , SIGN( 1._wp , t_su_b(ji) - rtt ) ) |
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[825] | 138 | ! igravdr : 1 if t_su lt t_bo |
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[3625] | 139 | igravdr = MAX( 0._wp , SIGN( 1._wp , t_bo_b(ji) - t_su_b(ji) ) ) |
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[825] | 140 | ! iaccrbo : 1 if bottom accretion |
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[3625] | 141 | iaccrbo = MAX( 0._wp , SIGN( 1._wp , dh_i_bott(ji) ) ) |
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[2715] | 142 | !!gm end useless |
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[2528] | 143 | ! |
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| 144 | fhbri_1d(ji) = 0._wp |
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[825] | 145 | END DO ! ji |
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| 146 | |
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| 147 | !---------------------------- |
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| 148 | ! Salt flux - brine drainage |
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| 149 | !---------------------------- |
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| 150 | DO ji = kideb, kiut |
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[3625] | 151 | i_ice_switch = 1._wp - MAX( 0._wp, SIGN( 1._wp , - ht_i_b(ji) ) ) |
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| 152 | sfx_bri_1d(ji) = sfx_bri_1d(ji) - i_ice_switch * rhoic * a_i_b(ji) * ht_i_b(ji) & |
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| 153 | & * ( MAX( dsm_i_gd_1d(ji) + dsm_i_fl_1d(ji) , sm_i_b(ji) - zsiold(ji) ) ) * r1_rdtice |
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| 154 | END DO |
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[825] | 155 | |
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| 156 | ! Only necessary for conservation check since salinity is modified |
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| 157 | !-------------------- |
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| 158 | ! Temperature update |
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| 159 | !-------------------- |
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| 160 | DO jk = 1, nlay_i |
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| 161 | DO ji = kideb, kiut |
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| 162 | ztmelts = -tmut*s_i_b(ji,jk) + rtt |
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| 163 | !Conversion q(S,T) -> T (second order equation) |
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| 164 | zaaa = cpic |
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[2528] | 165 | zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + q_i_b(ji,jk) / rhoic - lfus |
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[825] | 166 | zccc = lfus * ( ztmelts - rtt ) |
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[2715] | 167 | zdiscrim = SQRT( MAX( zbbb*zbbb - 4.0*zaaa*zccc, 0._wp ) ) |
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[2528] | 168 | t_i_b(ji,jk) = rtt - ( zbbb + zdiscrim ) / ( 2.0 *zaaa ) |
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[2715] | 169 | END DO |
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| 170 | END DO |
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[2528] | 171 | ! |
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[3625] | 172 | ENDIF |
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[825] | 173 | |
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[921] | 174 | !------------------------------------------------------------------------------| |
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| 175 | ! Module 3 : Profile of salinity, constant in time | |
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| 176 | !------------------------------------------------------------------------------| |
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[825] | 177 | |
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[3625] | 178 | IF( num_sal == 3 ) CALL lim_var_salprof1d( kideb, kiut ) |
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[825] | 179 | |
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| 180 | |
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[921] | 181 | !------------------------------------------------------------------------------| |
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| 182 | ! 5) Computation of salt flux due to Bottom growth |
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| 183 | !------------------------------------------------------------------------------| |
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[3625] | 184 | ! note: s_i_new = bulk_sal in constant salinity case |
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| 185 | DO ji = kideb, kiut |
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| 186 | sfx_thd_1d(ji) = sfx_thd_1d(ji) - s_i_new(ji) * rhoic * a_i_b(ji) * MAX( dh_i_bott(ji) , 0._wp ) * r1_rdtice |
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| 187 | END DO |
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[2528] | 188 | ! |
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[3294] | 189 | CALL wrk_dealloc( jpij, ze_init, zhiold, zsiold ) |
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[2715] | 190 | ! |
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[825] | 191 | END SUBROUTINE lim_thd_sal |
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| 192 | |
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[2528] | 193 | |
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[825] | 194 | SUBROUTINE lim_thd_sal_init |
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| 195 | !!------------------------------------------------------------------- |
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| 196 | !! *** ROUTINE lim_thd_sal_init *** |
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| 197 | !! |
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| 198 | !! ** Purpose : initialization of ice salinity parameters |
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| 199 | !! |
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[2528] | 200 | !! ** Method : Read the namicesal namelist and check the parameter |
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| 201 | !! values called at the first timestep (nit000) |
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[825] | 202 | !! |
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| 203 | !! ** input : Namelist namicesal |
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| 204 | !!------------------------------------------------------------------- |
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[2528] | 205 | NAMELIST/namicesal/ num_sal, bulk_sal, sal_G, time_G, sal_F, time_F, & |
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| 206 | & s_i_max, s_i_min, s_i_0, s_i_1 |
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[825] | 207 | !!------------------------------------------------------------------- |
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[2528] | 208 | ! |
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| 209 | REWIND( numnam_ice ) ! Read Namelist namicesal |
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| 210 | READ ( numnam_ice , namicesal ) |
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| 211 | ! |
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| 212 | IF(lwp) THEN ! control print |
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[825] | 213 | WRITE(numout,*) |
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| 214 | WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity ' |
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| 215 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
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| 216 | WRITE(numout,*) ' switch for salinity num_sal : ', num_sal |
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| 217 | WRITE(numout,*) ' bulk salinity value if num_sal = 1 : ', bulk_sal |
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| 218 | WRITE(numout,*) ' restoring salinity for GD : ', sal_G |
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| 219 | WRITE(numout,*) ' restoring time for GD : ', time_G |
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| 220 | WRITE(numout,*) ' restoring salinity for flushing : ', sal_F |
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| 221 | WRITE(numout,*) ' restoring time for flushing : ', time_F |
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| 222 | WRITE(numout,*) ' Maximum tolerated ice salinity : ', s_i_max |
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| 223 | WRITE(numout,*) ' Minimum tolerated ice salinity : ', s_i_min |
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| 224 | WRITE(numout,*) ' 1st salinity for salinity profile : ', s_i_0 |
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| 225 | WRITE(numout,*) ' 2nd salinity for salinity profile : ', s_i_1 |
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| 226 | ENDIF |
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[2528] | 227 | ! |
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[825] | 228 | END SUBROUTINE lim_thd_sal_init |
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| 229 | |
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| 230 | #else |
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| 231 | !!---------------------------------------------------------------------- |
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[2528] | 232 | !! Default option Dummy Module No LIM-3 sea-ice model |
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[825] | 233 | !!---------------------------------------------------------------------- |
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| 234 | #endif |
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| 235 | !!====================================================================== |
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| 236 | END MODULE limthd_sal |
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