1 | MODULE icethd_sal |
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2 | !!====================================================================== |
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3 | !! *** MODULE icethd_sal *** |
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4 | !! LIM-3 sea-ice : computation of salinity variations in the ice |
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5 | !!====================================================================== |
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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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8 | !! 4.0 ! 2011-02 (G. Madec) dynamical allocation |
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9 | !!--------------------------------------------------------------------- |
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10 | #if defined key_lim3 |
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11 | !!---------------------------------------------------------------------- |
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12 | !! 'key_lim3' LIM-3 sea-ice model |
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13 | !!---------------------------------------------------------------------- |
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14 | !! ice_thd_sal : salinity variations in the ice |
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15 | !!---------------------------------------------------------------------- |
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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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19 | USE ice1D ! LIM thermodynamics |
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20 | USE icevar ! LIM variables |
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21 | ! |
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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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25 | |
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26 | IMPLICIT NONE |
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27 | PRIVATE |
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28 | |
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29 | PUBLIC ice_thd_sal ! called by icethd module |
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30 | PUBLIC ice_thd_sal_init ! called by ice_init |
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31 | |
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32 | !!---------------------------------------------------------------------- |
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33 | !! NEMO/ICE 4.0 , NEMO Consortium (2017) |
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34 | !! $Id: icethd_sal.F90 8420 2017-08-08 12:18:46Z clem $ |
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35 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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36 | !!---------------------------------------------------------------------- |
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37 | CONTAINS |
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38 | |
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39 | SUBROUTINE ice_thd_sal |
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40 | !!------------------------------------------------------------------- |
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41 | !! *** ROUTINE ice_thd_sal *** |
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42 | !! |
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43 | !! ** Purpose : computes new salinities in the ice |
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44 | !! |
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45 | !! ** Method : 3 possibilities |
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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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49 | !!--------------------------------------------------------------------- |
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50 | INTEGER :: ji, jk ! dummy loop indices |
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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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53 | !!--------------------------------------------------------------------- |
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54 | |
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55 | SELECT CASE ( nn_icesal ) |
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56 | ! |
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57 | ! !---------------------------------------------! |
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58 | CASE( 2 ) ! time varying salinity with linear profile ! |
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59 | ! !---------------------------------------------! |
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60 | DO ji = 1, nidx |
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61 | |
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62 | !--------------------------------------------------------- |
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63 | ! Update ice salinity from snow-ice and bottom growth |
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64 | !--------------------------------------------------------- |
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65 | zs_sni = sss_1d(ji) * ( rhoic - rhosn ) * r1_rhoic ! Salinity of snow ice |
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66 | rswitch = MAX( 0._wp , SIGN( 1._wp , ht_i_1d(ji) - epsi20 ) ) |
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67 | 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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68 | 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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69 | |
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70 | ! Update salinity (nb: salt flux already included in icethd_dh) |
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71 | sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_bg + zsm_i_si |
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72 | |
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73 | IF( ln_icedS ) THEN |
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74 | !--------------------------------------------------------- |
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75 | ! Update ice salinity from brine drainage and flushing |
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76 | !--------------------------------------------------------- |
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77 | iflush = MAX( 0._wp , SIGN( 1._wp , t_su_1d(ji) - rt0 ) ) ! =1 if summer |
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78 | 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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79 | 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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80 | zsm_i_fl = - iflush * MAX( sm_i_1d(ji) - rn_sal_fl , 0._wp ) / rn_time_fl * rdt_ice ! flushing |
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81 | |
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82 | ! Update salinity |
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83 | sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_fl + zsm_i_gd |
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84 | |
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85 | ! Salt flux |
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86 | 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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87 | ENDIF |
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88 | END DO |
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89 | |
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90 | ! Salinity profile |
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91 | CALL ice_var_salprof1d |
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92 | ! |
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93 | ! !---------------------------------------------! |
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94 | CASE( 3 ) ! constant salinity with a fixed profile ! (Schwarzacher (1959) multiyear salinity profile(mean = 2.30) |
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95 | ! !---------------------------------------------! |
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96 | CALL ice_var_salprof1d |
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97 | ! |
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98 | END SELECT |
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99 | ! |
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100 | END SUBROUTINE ice_thd_sal |
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101 | |
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102 | |
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103 | SUBROUTINE ice_thd_sal_init |
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104 | !!------------------------------------------------------------------- |
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105 | !! *** ROUTINE ice_thd_sal_init *** |
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106 | !! |
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107 | !! ** Purpose : initialization of ice salinity parameters |
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108 | !! |
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109 | !! ** Method : Read the namice_sal namelist and check the parameter |
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110 | !! values called at the first timestep (nit000) |
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111 | !! |
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112 | !! ** input : Namelist namice_sal |
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113 | !!------------------------------------------------------------------- |
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114 | INTEGER :: ios ! Local integer output status for namelist read |
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115 | !! |
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116 | NAMELIST/namice_sal/ ln_icedS , nn_icesal , rn_icesal, rn_sal_gd, rn_time_gd, & |
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117 | & rn_sal_fl, rn_time_fl, rn_simax , rn_simin |
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118 | !!------------------------------------------------------------------- |
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119 | ! |
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120 | REWIND( numnam_ice_ref ) ! Namelist namice_sal in reference namelist : Ice salinity |
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121 | READ ( numnam_ice_ref, namice_sal, IOSTAT = ios, ERR = 901) |
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122 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namice_sal in reference namelist', lwp ) |
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123 | ! |
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124 | REWIND( numnam_ice_cfg ) ! Namelist namice_sal in configuration namelist : Ice salinity |
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125 | READ ( numnam_ice_cfg, namice_sal, IOSTAT = ios, ERR = 902 ) |
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126 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namice_sal in configuration namelist', lwp ) |
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127 | IF(lwm) WRITE ( numoni, namice_sal ) |
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128 | ! |
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129 | IF(lwp) THEN ! control print |
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130 | WRITE(numout,*) |
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131 | WRITE(numout,*) 'ice_thd_sal_init : Ice parameters for salinity ' |
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132 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
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133 | WRITE(numout,*) ' Namelist namice_sal' |
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134 | WRITE(numout,*) ' activate gravity drainage and flushing (T) or not (F) ln_icedS = ', ln_icedS |
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135 | WRITE(numout,*) ' switch for salinity nn_icesal = ', nn_icesal |
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136 | WRITE(numout,*) ' bulk salinity value if nn_icesal = 1 rn_icesal = ', rn_icesal |
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137 | WRITE(numout,*) ' restoring salinity for gravity drainage rn_sal_gd = ', rn_sal_gd |
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138 | WRITE(numout,*) ' restoring time for for gravity drainage rn_time_gd = ', rn_time_gd |
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139 | WRITE(numout,*) ' restoring salinity for flushing rn_sal_fl = ', rn_sal_fl |
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140 | WRITE(numout,*) ' restoring time for flushing rn_time_fl = ', rn_time_fl |
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141 | WRITE(numout,*) ' Maximum tolerated ice salinity rn_simax = ', rn_simax |
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142 | WRITE(numout,*) ' Minimum tolerated ice salinity rn_simin = ', rn_simin |
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143 | ENDIF |
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144 | ! |
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145 | END SUBROUTINE ice_thd_sal_init |
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146 | |
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147 | #else |
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148 | !!---------------------------------------------------------------------- |
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149 | !! Default option Dummy Module No LIM-3 sea-ice model |
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150 | !!---------------------------------------------------------------------- |
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151 | #endif |
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152 | |
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153 | !!====================================================================== |
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154 | END MODULE icethd_sal |
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