[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 ice ! LIM variables |
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[8420] | 19 | USE ice1D ! LIM thermodynamics |
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[3625] | 20 | USE limvar ! LIM variables |
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[8378] | 21 | ! |
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[3625] | 22 | USE in_out_manager ! I/O manager |
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| 23 | USE lib_mpp ! MPP library |
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| 24 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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[825] | 25 | |
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| 26 | IMPLICIT NONE |
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| 27 | PRIVATE |
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| 28 | |
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[2528] | 29 | PUBLIC lim_thd_sal ! called by limthd module |
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[8321] | 30 | PUBLIC lim_thd_sal_init ! called by ice_init |
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[825] | 31 | |
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[1156] | 32 | !!---------------------------------------------------------------------- |
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[4161] | 33 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
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[1156] | 34 | !! $Id$ |
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[2528] | 35 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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[1156] | 36 | !!---------------------------------------------------------------------- |
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[921] | 37 | CONTAINS |
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[825] | 38 | |
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[8342] | 39 | SUBROUTINE lim_thd_sal |
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[825] | 40 | !!------------------------------------------------------------------- |
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[2528] | 41 | !! *** ROUTINE lim_thd_sal *** |
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| 42 | !! |
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| 43 | !! ** Purpose : computes new salinities in the ice |
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[825] | 44 | !! |
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[3625] | 45 | !! ** Method : 3 possibilities |
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[5123] | 46 | !! -> nn_icesal = 1 -> Sice = cst [ice salinity constant in both time & space] |
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| 47 | !! -> nn_icesal = 2 -> Sice = S(z,t) [Vancoppenolle et al. 2005] |
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| 48 | !! -> nn_icesal = 3 -> Sice = S(z) [multiyear ice] |
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[825] | 49 | !!--------------------------------------------------------------------- |
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[8326] | 50 | INTEGER :: ji, jk ! dummy loop indices |
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[7646] | 51 | REAL(wp) :: iflush, igravdr ! local scalars |
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| 52 | REAL(wp) :: zs_sni, zsm_i_gd, zsm_i_fl, zsm_i_si, zsm_i_bg ! local scalars |
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[2528] | 53 | !!--------------------------------------------------------------------- |
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[825] | 54 | |
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[6470] | 55 | !--------------------------------------------------------------------| |
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| 56 | ! 1) salinity constant in time | |
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| 57 | !--------------------------------------------------------------------| |
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| 58 | ! do nothing |
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[825] | 59 | |
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[6470] | 60 | !----------------------------------------------------------------------| |
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| 61 | ! 2) salinity varying in time | |
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| 62 | !----------------------------------------------------------------------| |
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[5123] | 63 | IF( nn_icesal == 2 ) THEN |
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[825] | 64 | |
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[8342] | 65 | DO ji = 1, nidx |
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[825] | 66 | |
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[7646] | 67 | !--------------------------------------------------------- |
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| 68 | ! Update ice salinity from snow-ice and bottom growth |
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| 69 | !--------------------------------------------------------- |
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[8326] | 70 | zs_sni = sss_1d(ji) * ( rhoic - rhosn ) * r1_rhoic ! Salinity of snow ice |
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[7646] | 71 | rswitch = MAX( 0._wp , SIGN( 1._wp , ht_i_1d(ji) - epsi20 ) ) |
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| 72 | zsm_i_si = ( zs_sni - sm_i_1d(ji) ) * dh_snowice(ji) / MAX( ht_i_1d(ji), epsi20 ) * rswitch ! snow-ice |
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| 73 | zsm_i_bg = ( s_i_new(ji) - sm_i_1d(ji) ) * MAX( 0._wp, dh_i_bott(ji) ) / MAX( ht_i_1d(ji), epsi20 ) * rswitch ! bottom growth |
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[825] | 74 | |
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[7646] | 75 | ! Update salinity (nb: salt flux already included in limthd_dh) |
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| 76 | sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_bg + zsm_i_si |
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[825] | 77 | |
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[7646] | 78 | IF( ln_limdS ) THEN |
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| 79 | !--------------------------------------------------------- |
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| 80 | ! Update ice salinity from brine drainage and flushing |
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| 81 | !--------------------------------------------------------- |
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| 82 | iflush = MAX( 0._wp , SIGN( 1._wp , t_su_1d(ji) - rt0 ) ) ! =1 if summer |
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| 83 | igravdr = MAX( 0._wp , SIGN( 1._wp , t_bo_1d(ji) - t_su_1d(ji) ) ) ! =1 if t_su < t_bo |
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| 84 | zsm_i_gd = - igravdr * MAX( sm_i_1d(ji) - rn_sal_gd , 0._wp ) / rn_time_gd * rdt_ice ! gravity drainage |
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| 85 | zsm_i_fl = - iflush * MAX( sm_i_1d(ji) - rn_sal_fl , 0._wp ) / rn_time_fl * rdt_ice ! flushing |
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| 86 | |
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| 87 | ! Update salinity |
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| 88 | sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_fl + zsm_i_gd |
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| 89 | |
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| 90 | ! Salt flux |
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| 91 | sfx_bri_1d(ji) = sfx_bri_1d(ji) - rhoic * a_i_1d(ji) * ht_i_1d(ji) * ( zsm_i_fl + zsm_i_gd ) * r1_rdtice |
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| 92 | ENDIF |
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[4161] | 93 | END DO |
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[825] | 94 | |
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[4161] | 95 | ! Salinity profile |
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[8342] | 96 | CALL lim_var_salprof1d |
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[2528] | 97 | ! |
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[3625] | 98 | ENDIF |
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[825] | 99 | |
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[921] | 100 | !------------------------------------------------------------------------------| |
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[6470] | 101 | ! 3) vertical profile of salinity, constant in time | |
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[921] | 102 | !------------------------------------------------------------------------------| |
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[8342] | 103 | IF( nn_icesal == 3 ) CALL lim_var_salprof1d |
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[825] | 104 | |
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[2528] | 105 | ! |
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[825] | 106 | END SUBROUTINE lim_thd_sal |
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| 107 | |
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[2528] | 108 | |
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[825] | 109 | SUBROUTINE lim_thd_sal_init |
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| 110 | !!------------------------------------------------------------------- |
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| 111 | !! *** ROUTINE lim_thd_sal_init *** |
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| 112 | !! |
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| 113 | !! ** Purpose : initialization of ice salinity parameters |
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| 114 | !! |
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[2528] | 115 | !! ** Method : Read the namicesal namelist and check the parameter |
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| 116 | !! values called at the first timestep (nit000) |
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[825] | 117 | !! |
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| 118 | !! ** input : Namelist namicesal |
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| 119 | !!------------------------------------------------------------------- |
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[4147] | 120 | INTEGER :: ios ! Local integer output status for namelist read |
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[7646] | 121 | NAMELIST/namicesal/ ln_limdS, nn_icesal, rn_icesal, rn_sal_gd, rn_time_gd, & |
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| 122 | & rn_sal_fl, rn_time_fl, rn_simax, rn_simin |
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[825] | 123 | !!------------------------------------------------------------------- |
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[2528] | 124 | ! |
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[4147] | 125 | REWIND( numnam_ice_ref ) ! Namelist namicesal in reference namelist : Ice salinity |
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| 126 | READ ( numnam_ice_ref, namicesal, IOSTAT = ios, ERR = 901) |
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| 127 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicesal in reference namelist', lwp ) |
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| 128 | |
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| 129 | REWIND( numnam_ice_cfg ) ! Namelist namicesal in configuration namelist : Ice salinity |
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| 130 | READ ( numnam_ice_cfg, namicesal, IOSTAT = ios, ERR = 902 ) |
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| 131 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicesal in configuration namelist', lwp ) |
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[4624] | 132 | IF(lwm) WRITE ( numoni, namicesal ) |
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[2528] | 133 | ! |
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| 134 | IF(lwp) THEN ! control print |
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[825] | 135 | WRITE(numout,*) |
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| 136 | WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity ' |
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| 137 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
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[7646] | 138 | WRITE(numout,*) ' activate gravity drainage and flushing (T) or not (F) ln_limdS = ', ln_limdS |
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| 139 | WRITE(numout,*) ' switch for salinity nn_icesal = ', nn_icesal |
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| 140 | WRITE(numout,*) ' bulk salinity value if nn_icesal = 1 rn_icesal = ', rn_icesal |
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| 141 | WRITE(numout,*) ' restoring salinity for gravity drainage rn_sal_gd = ', rn_sal_gd |
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| 142 | WRITE(numout,*) ' restoring time for for gravity drainage rn_time_gd = ', rn_time_gd |
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| 143 | WRITE(numout,*) ' restoring salinity for flushing rn_sal_fl = ', rn_sal_fl |
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| 144 | WRITE(numout,*) ' restoring time for flushing rn_time_fl = ', rn_time_fl |
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| 145 | WRITE(numout,*) ' Maximum tolerated ice salinity rn_simax = ', rn_simax |
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| 146 | WRITE(numout,*) ' Minimum tolerated ice salinity rn_simin = ', rn_simin |
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[825] | 147 | ENDIF |
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[2528] | 148 | ! |
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[825] | 149 | END SUBROUTINE lim_thd_sal_init |
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| 150 | |
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| 151 | #else |
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| 152 | !!---------------------------------------------------------------------- |
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[2528] | 153 | !! Default option Dummy Module No LIM-3 sea-ice model |
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[825] | 154 | !!---------------------------------------------------------------------- |
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| 155 | #endif |
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| 156 | !!====================================================================== |
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| 157 | END MODULE limthd_sal |
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