[8422] | 1 | MODULE icethd_sal |
---|
| 2 | !!====================================================================== |
---|
| 3 | !! *** MODULE icethd_sal *** |
---|
| 4 | !! LIM-3 sea-ice : computation of salinity variations in the ice |
---|
| 5 | !!====================================================================== |
---|
| 6 | !! History : - ! 2003-05 (M. Vancoppenolle) UCL-ASTR first coding for LIM3-1D |
---|
| 7 | !! 3.0 ! 2005-12 (M. Vancoppenolle) adapted to the 3-D version |
---|
| 8 | !! 4.0 ! 2011-02 (G. Madec) dynamical allocation |
---|
| 9 | !!--------------------------------------------------------------------- |
---|
| 10 | #if defined key_lim3 |
---|
| 11 | !!---------------------------------------------------------------------- |
---|
| 12 | !! 'key_lim3' LIM-3 sea-ice model |
---|
| 13 | !!---------------------------------------------------------------------- |
---|
| 14 | !! ice_thd_sal : salinity variations in the ice |
---|
| 15 | !!---------------------------------------------------------------------- |
---|
| 16 | USE par_oce ! ocean parameters |
---|
| 17 | USE phycst ! physical constants (ocean directory) |
---|
| 18 | USE ice ! LIM variables |
---|
| 19 | USE ice1D ! LIM thermodynamics |
---|
[8424] | 20 | USE icevar ! LIM variables |
---|
[8422] | 21 | ! |
---|
| 22 | USE in_out_manager ! I/O manager |
---|
| 23 | USE lib_mpp ! MPP library |
---|
| 24 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
---|
| 25 | |
---|
| 26 | IMPLICIT NONE |
---|
| 27 | PRIVATE |
---|
| 28 | |
---|
| 29 | PUBLIC ice_thd_sal ! called by icethd module |
---|
| 30 | PUBLIC ice_thd_sal_init ! called by ice_init |
---|
| 31 | |
---|
| 32 | !!---------------------------------------------------------------------- |
---|
| 33 | !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) |
---|
| 34 | !! $Id: icethd_sal.F90 8420 2017-08-08 12:18:46Z clem $ |
---|
| 35 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
---|
| 36 | !!---------------------------------------------------------------------- |
---|
| 37 | CONTAINS |
---|
| 38 | |
---|
| 39 | SUBROUTINE ice_thd_sal |
---|
| 40 | !!------------------------------------------------------------------- |
---|
| 41 | !! *** ROUTINE ice_thd_sal *** |
---|
| 42 | !! |
---|
| 43 | !! ** Purpose : computes new salinities in the ice |
---|
| 44 | !! |
---|
| 45 | !! ** Method : 3 possibilities |
---|
| 46 | !! -> nn_icesal = 1 -> Sice = cst [ice salinity constant in both time & space] |
---|
| 47 | !! -> nn_icesal = 2 -> Sice = S(z,t) [Vancoppenolle et al. 2005] |
---|
| 48 | !! -> nn_icesal = 3 -> Sice = S(z) [multiyear ice] |
---|
| 49 | !!--------------------------------------------------------------------- |
---|
| 50 | INTEGER :: ji, jk ! dummy loop indices |
---|
| 51 | REAL(wp) :: iflush, igravdr ! local scalars |
---|
| 52 | REAL(wp) :: zs_sni, zsm_i_gd, zsm_i_fl, zsm_i_si, zsm_i_bg ! local scalars |
---|
| 53 | !!--------------------------------------------------------------------- |
---|
| 54 | |
---|
| 55 | !--------------------------------------------------------------------| |
---|
| 56 | ! 1) salinity constant in time | |
---|
| 57 | !--------------------------------------------------------------------| |
---|
| 58 | ! do nothing |
---|
| 59 | |
---|
| 60 | !----------------------------------------------------------------------| |
---|
| 61 | ! 2) salinity varying in time | |
---|
| 62 | !----------------------------------------------------------------------| |
---|
| 63 | IF( nn_icesal == 2 ) THEN |
---|
| 64 | |
---|
| 65 | DO ji = 1, nidx |
---|
| 66 | |
---|
| 67 | !--------------------------------------------------------- |
---|
| 68 | ! Update ice salinity from snow-ice and bottom growth |
---|
| 69 | !--------------------------------------------------------- |
---|
| 70 | zs_sni = sss_1d(ji) * ( rhoic - rhosn ) * r1_rhoic ! Salinity of snow ice |
---|
| 71 | rswitch = MAX( 0._wp , SIGN( 1._wp , ht_i_1d(ji) - epsi20 ) ) |
---|
| 72 | zsm_i_si = ( zs_sni - sm_i_1d(ji) ) * dh_snowice(ji) / MAX( ht_i_1d(ji), epsi20 ) * rswitch ! snow-ice |
---|
| 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 |
---|
| 74 | |
---|
| 75 | ! Update salinity (nb: salt flux already included in icethd_dh) |
---|
| 76 | sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_bg + zsm_i_si |
---|
| 77 | |
---|
| 78 | IF( ln_limdS ) THEN |
---|
| 79 | !--------------------------------------------------------- |
---|
| 80 | ! Update ice salinity from brine drainage and flushing |
---|
| 81 | !--------------------------------------------------------- |
---|
| 82 | iflush = MAX( 0._wp , SIGN( 1._wp , t_su_1d(ji) - rt0 ) ) ! =1 if summer |
---|
| 83 | igravdr = MAX( 0._wp , SIGN( 1._wp , t_bo_1d(ji) - t_su_1d(ji) ) ) ! =1 if t_su < t_bo |
---|
| 84 | zsm_i_gd = - igravdr * MAX( sm_i_1d(ji) - rn_sal_gd , 0._wp ) / rn_time_gd * rdt_ice ! gravity drainage |
---|
| 85 | zsm_i_fl = - iflush * MAX( sm_i_1d(ji) - rn_sal_fl , 0._wp ) / rn_time_fl * rdt_ice ! flushing |
---|
| 86 | |
---|
| 87 | ! Update salinity |
---|
| 88 | sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_fl + zsm_i_gd |
---|
| 89 | |
---|
| 90 | ! Salt flux |
---|
| 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 |
---|
| 92 | ENDIF |
---|
| 93 | END DO |
---|
| 94 | |
---|
| 95 | ! Salinity profile |
---|
[8424] | 96 | CALL ice_var_salprof1d |
---|
[8422] | 97 | ! |
---|
| 98 | ENDIF |
---|
| 99 | |
---|
| 100 | !------------------------------------------------------------------------------| |
---|
| 101 | ! 3) vertical profile of salinity, constant in time | |
---|
| 102 | !------------------------------------------------------------------------------| |
---|
[8424] | 103 | IF( nn_icesal == 3 ) CALL ice_var_salprof1d |
---|
[8422] | 104 | |
---|
| 105 | ! |
---|
| 106 | END SUBROUTINE ice_thd_sal |
---|
| 107 | |
---|
| 108 | |
---|
| 109 | SUBROUTINE ice_thd_sal_init |
---|
| 110 | !!------------------------------------------------------------------- |
---|
| 111 | !! *** ROUTINE ice_thd_sal_init *** |
---|
| 112 | !! |
---|
| 113 | !! ** Purpose : initialization of ice salinity parameters |
---|
| 114 | !! |
---|
| 115 | !! ** Method : Read the namicesal namelist and check the parameter |
---|
| 116 | !! values called at the first timestep (nit000) |
---|
| 117 | !! |
---|
| 118 | !! ** input : Namelist namicesal |
---|
| 119 | !!------------------------------------------------------------------- |
---|
| 120 | INTEGER :: ios ! Local integer output status for namelist read |
---|
| 121 | NAMELIST/namicesal/ ln_limdS, nn_icesal, rn_icesal, rn_sal_gd, rn_time_gd, & |
---|
| 122 | & rn_sal_fl, rn_time_fl, rn_simax, rn_simin |
---|
| 123 | !!------------------------------------------------------------------- |
---|
| 124 | ! |
---|
| 125 | REWIND( numnam_ice_ref ) ! Namelist namicesal in reference namelist : Ice salinity |
---|
| 126 | READ ( numnam_ice_ref, namicesal, IOSTAT = ios, ERR = 901) |
---|
| 127 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicesal in reference namelist', lwp ) |
---|
| 128 | |
---|
| 129 | REWIND( numnam_ice_cfg ) ! Namelist namicesal in configuration namelist : Ice salinity |
---|
| 130 | READ ( numnam_ice_cfg, namicesal, IOSTAT = ios, ERR = 902 ) |
---|
| 131 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicesal in configuration namelist', lwp ) |
---|
| 132 | IF(lwm) WRITE ( numoni, namicesal ) |
---|
| 133 | ! |
---|
| 134 | IF(lwp) THEN ! control print |
---|
| 135 | WRITE(numout,*) |
---|
| 136 | WRITE(numout,*) 'ice_thd_sal_init : Ice parameters for salinity ' |
---|
| 137 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
---|
| 138 | WRITE(numout,*) ' activate gravity drainage and flushing (T) or not (F) ln_limdS = ', ln_limdS |
---|
| 139 | WRITE(numout,*) ' switch for salinity nn_icesal = ', nn_icesal |
---|
| 140 | WRITE(numout,*) ' bulk salinity value if nn_icesal = 1 rn_icesal = ', rn_icesal |
---|
| 141 | WRITE(numout,*) ' restoring salinity for gravity drainage rn_sal_gd = ', rn_sal_gd |
---|
| 142 | WRITE(numout,*) ' restoring time for for gravity drainage rn_time_gd = ', rn_time_gd |
---|
| 143 | WRITE(numout,*) ' restoring salinity for flushing rn_sal_fl = ', rn_sal_fl |
---|
| 144 | WRITE(numout,*) ' restoring time for flushing rn_time_fl = ', rn_time_fl |
---|
| 145 | WRITE(numout,*) ' Maximum tolerated ice salinity rn_simax = ', rn_simax |
---|
| 146 | WRITE(numout,*) ' Minimum tolerated ice salinity rn_simin = ', rn_simin |
---|
| 147 | ENDIF |
---|
| 148 | ! |
---|
| 149 | END SUBROUTINE ice_thd_sal_init |
---|
| 150 | |
---|
| 151 | #else |
---|
| 152 | !!---------------------------------------------------------------------- |
---|
| 153 | !! Default option Dummy Module No LIM-3 sea-ice model |
---|
| 154 | !!---------------------------------------------------------------------- |
---|
| 155 | #endif |
---|
| 156 | !!====================================================================== |
---|
| 157 | END MODULE icethd_sal |
---|