MODULE icethd_sal !!====================================================================== !! *** MODULE icethd_sal *** !! LIM-3 sea-ice : computation of salinity variations in the ice !!====================================================================== !! History : - ! 2003-05 (M. Vancoppenolle) UCL-ASTR first coding for LIM3-1D !! 3.0 ! 2005-12 (M. Vancoppenolle) adapted to the 3-D version !! 4.0 ! 2011-02 (G. Madec) dynamical allocation !!--------------------------------------------------------------------- #if defined key_lim3 !!---------------------------------------------------------------------- !! 'key_lim3' LIM-3 sea-ice model !!---------------------------------------------------------------------- !! ice_thd_sal : salinity variations in the ice !!---------------------------------------------------------------------- USE par_oce ! ocean parameters USE phycst ! physical constants (ocean directory) USE ice ! LIM variables USE ice1D ! LIM thermodynamics USE icevar ! LIM variables ! USE in_out_manager ! I/O manager USE lib_mpp ! MPP library USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) IMPLICIT NONE PRIVATE PUBLIC ice_thd_sal ! called by icethd module PUBLIC ice_thd_sal_init ! called by ice_init !!---------------------------------------------------------------------- !! NEMO/LIM3 4.0 , UCL - NEMO Consortium (2011) !! $Id: icethd_sal.F90 8420 2017-08-08 12:18:46Z clem $ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE ice_thd_sal !!------------------------------------------------------------------- !! *** ROUTINE ice_thd_sal *** !! !! ** Purpose : computes new salinities in the ice !! !! ** Method : 3 possibilities !! -> nn_icesal = 1 -> Sice = cst [ice salinity constant in both time & space] !! -> nn_icesal = 2 -> Sice = S(z,t) [Vancoppenolle et al. 2005] !! -> nn_icesal = 3 -> Sice = S(z) [multiyear ice] !!--------------------------------------------------------------------- INTEGER :: ji, jk ! dummy loop indices REAL(wp) :: iflush, igravdr ! local scalars REAL(wp) :: zs_sni, zsm_i_gd, zsm_i_fl, zsm_i_si, zsm_i_bg ! local scalars !!--------------------------------------------------------------------- !--------------------------------------------------------------------| ! 1) salinity constant in time | !--------------------------------------------------------------------| ! do nothing !----------------------------------------------------------------------| ! 2) salinity varying in time | !----------------------------------------------------------------------| IF( nn_icesal == 2 ) THEN DO ji = 1, nidx !--------------------------------------------------------- ! Update ice salinity from snow-ice and bottom growth !--------------------------------------------------------- zs_sni = sss_1d(ji) * ( rhoic - rhosn ) * r1_rhoic ! Salinity of snow ice rswitch = MAX( 0._wp , SIGN( 1._wp , ht_i_1d(ji) - epsi20 ) ) zsm_i_si = ( zs_sni - sm_i_1d(ji) ) * dh_snowice(ji) / MAX( ht_i_1d(ji), epsi20 ) * rswitch ! snow-ice 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 ! Update salinity (nb: salt flux already included in icethd_dh) sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_bg + zsm_i_si IF( ln_limdS ) THEN !--------------------------------------------------------- ! Update ice salinity from brine drainage and flushing !--------------------------------------------------------- iflush = MAX( 0._wp , SIGN( 1._wp , t_su_1d(ji) - rt0 ) ) ! =1 if summer igravdr = MAX( 0._wp , SIGN( 1._wp , t_bo_1d(ji) - t_su_1d(ji) ) ) ! =1 if t_su < t_bo zsm_i_gd = - igravdr * MAX( sm_i_1d(ji) - rn_sal_gd , 0._wp ) / rn_time_gd * rdt_ice ! gravity drainage zsm_i_fl = - iflush * MAX( sm_i_1d(ji) - rn_sal_fl , 0._wp ) / rn_time_fl * rdt_ice ! flushing ! Update salinity sm_i_1d(ji) = sm_i_1d(ji) + zsm_i_fl + zsm_i_gd ! Salt flux 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 ENDIF END DO ! Salinity profile CALL ice_var_salprof1d ! ENDIF !------------------------------------------------------------------------------| ! 3) vertical profile of salinity, constant in time | !------------------------------------------------------------------------------| IF( nn_icesal == 3 ) CALL ice_var_salprof1d ! END SUBROUTINE ice_thd_sal SUBROUTINE ice_thd_sal_init !!------------------------------------------------------------------- !! *** ROUTINE ice_thd_sal_init *** !! !! ** Purpose : initialization of ice salinity parameters !! !! ** Method : Read the namicesal namelist and check the parameter !! values called at the first timestep (nit000) !! !! ** input : Namelist namicesal !!------------------------------------------------------------------- INTEGER :: ios ! Local integer output status for namelist read NAMELIST/namicesal/ ln_limdS, nn_icesal, rn_icesal, rn_sal_gd, rn_time_gd, & & rn_sal_fl, rn_time_fl, rn_simax, rn_simin !!------------------------------------------------------------------- ! REWIND( numnam_ice_ref ) ! Namelist namicesal in reference namelist : Ice salinity READ ( numnam_ice_ref, namicesal, IOSTAT = ios, ERR = 901) 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicesal in reference namelist', lwp ) REWIND( numnam_ice_cfg ) ! Namelist namicesal in configuration namelist : Ice salinity READ ( numnam_ice_cfg, namicesal, IOSTAT = ios, ERR = 902 ) 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicesal in configuration namelist', lwp ) IF(lwm) WRITE ( numoni, namicesal ) ! IF(lwp) THEN ! control print WRITE(numout,*) WRITE(numout,*) 'ice_thd_sal_init : Ice parameters for salinity ' WRITE(numout,*) '~~~~~~~~~~~~~~~~' WRITE(numout,*) ' activate gravity drainage and flushing (T) or not (F) ln_limdS = ', ln_limdS WRITE(numout,*) ' switch for salinity nn_icesal = ', nn_icesal WRITE(numout,*) ' bulk salinity value if nn_icesal = 1 rn_icesal = ', rn_icesal WRITE(numout,*) ' restoring salinity for gravity drainage rn_sal_gd = ', rn_sal_gd WRITE(numout,*) ' restoring time for for gravity drainage rn_time_gd = ', rn_time_gd WRITE(numout,*) ' restoring salinity for flushing rn_sal_fl = ', rn_sal_fl WRITE(numout,*) ' restoring time for flushing rn_time_fl = ', rn_time_fl WRITE(numout,*) ' Maximum tolerated ice salinity rn_simax = ', rn_simax WRITE(numout,*) ' Minimum tolerated ice salinity rn_simin = ', rn_simin ENDIF ! END SUBROUTINE ice_thd_sal_init #else !!---------------------------------------------------------------------- !! Default option Dummy Module No LIM-3 sea-ice model !!---------------------------------------------------------------------- #endif !!====================================================================== END MODULE icethd_sal