MODULE limistate !!====================================================================== !! *** MODULE limistate *** !! Initialisation of diagnostics ice variables !!====================================================================== !! History : 2.0 ! 2004-01 (C. Ethe, G. Madec) Original code !! 4.0 ! 2011-02 (G. Madec) dynamical allocation !! - ! 2014 (C. Rousset) add N/S initializations !!---------------------------------------------------------------------- #if defined key_lim3 !!---------------------------------------------------------------------- !! 'key_lim3' : LIM3 sea-ice model !!---------------------------------------------------------------------- !! lim_istate : Initialisation of diagnostics ice variables !! lim_istate_init : initialization of ice state and namelist read !!---------------------------------------------------------------------- USE phycst ! physical constant USE oce ! dynamics and tracers variables USE dom_oce ! ocean domain USE sbc_oce ! Surface boundary condition: ocean fields USE sbc_ice ! Surface boundary condition: ice fields USE eosbn2 ! equation of state USE ice ! sea-ice variables USE par_oce ! ocean parameters USE dom_ice ! sea-ice domain USE limvar ! lim_var_salprof 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) USE wrk_nemo ! work arrays IMPLICIT NONE PRIVATE PUBLIC lim_istate ! routine called by lim_init.F90 ! !!** init namelist (namiceini) ** REAL(wp) :: rn_thres_sst ! threshold water temperature for initial sea ice REAL(wp) :: rn_hts_ini_n ! initial snow thickness in the north REAL(wp) :: rn_hts_ini_s ! initial snow thickness in the south REAL(wp) :: rn_hti_ini_n ! initial ice thickness in the north REAL(wp) :: rn_hti_ini_s ! initial ice thickness in the south REAL(wp) :: rn_ati_ini_n ! initial leads area in the north REAL(wp) :: rn_ati_ini_s ! initial leads area in the south REAL(wp) :: rn_smi_ini_n ! initial salinity REAL(wp) :: rn_smi_ini_s ! initial salinity REAL(wp) :: rn_tmi_ini_n ! initial temperature REAL(wp) :: rn_tmi_ini_s ! initial temperature LOGICAL :: ln_iceini ! initialization or not !!---------------------------------------------------------------------- !! LIM 3.0, UCL-LOCEAN-IPSL (2008) !! $Id: limistate.F90 5540 2015-07-02 15:11:23Z jchanut $ !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE lim_istate !!------------------------------------------------------------------- !! *** ROUTINE lim_istate *** !! !! ** Purpose : defined the sea-ice initial state !! !! ** Method : !! This routine will put some ice where ocean !! is at the freezing point, then fill in ice !! state variables using prescribed initial !! values in the namelist !! !! ** Steps : !! 1) Read namelist !! 2) Basal temperature; ice and hemisphere masks !! 3) Fill in the ice thickness distribution using gaussian !! 4) Fill in space-dependent arrays for state variables !! 5) Diagnostic arrays !! 6) Lateral boundary conditions !! !! ** Notes : o_i, t_su, t_s, t_i, s_i must be filled everywhere, even !! where there is no ice (clem: I do not know why, is it mandatory?) !! !! History : !! 2.0 ! 01-04 (C. Ethe, G. Madec) Original code !! 3.0 ! 2007 (M. Vancoppenolle) Rewrite for ice cats !! 4.0 ! 09-11 (M. Vancoppenolle) Enhanced version for ice cats !!-------------------------------------------------------------------- !! * Local variables INTEGER :: ji, jj, jk, jl ! dummy loop indices REAL(wp) :: ztmelts, zdh INTEGER :: i_hemis, i_fill, jl0 REAL(wp) :: ztest_1, ztest_2, ztest_3, ztest_4, ztests, zsigma, zarg, zA, zV, zA_cons, zV_cons, zconv REAL(wp), POINTER, DIMENSION(:) :: zht_i_ini, zat_i_ini, zvt_i_ini, zht_s_ini, zsm_i_ini, ztm_i_ini REAL(wp), POINTER, DIMENSION(:,:) :: zh_i_ini, za_i_ini, zv_i_ini REAL(wp), POINTER, DIMENSION(:,:) :: zswitch ! ice indicator INTEGER, POINTER, DIMENSION(:,:) :: zhemis ! hemispheric index !-------------------------------------------------------------------- CALL wrk_alloc( jpi, jpj, zswitch ) CALL wrk_alloc( jpi, jpj, zhemis ) CALL wrk_alloc( jpl, 2, zh_i_ini, za_i_ini, zv_i_ini ) CALL wrk_alloc( 2, zht_i_ini, zat_i_ini, zvt_i_ini, zht_s_ini, zsm_i_ini, ztm_i_ini ) IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'lim_istate : Ice initialization ' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ' !-------------------------------------------------------------------- ! 1) Read namelist !-------------------------------------------------------------------- CALL lim_istate_init ! reading the initials parameters of the ice ! surface temperature DO jl = 1, jpl ! loop over categories t_su (:,:,jl) = rt0 * tmask(:,:,1) tn_ice(:,:,jl) = rt0 * tmask(:,:,1) END DO ! basal temperature (considered at freezing point) CALL eos_fzp( sss_m(:,:), t_bo(:,:) ) t_bo(:,:) = ( t_bo(:,:) + rt0 ) * tmask(:,:,1) IF( ln_iceini ) THEN !-------------------------------------------------------------------- ! 2) Basal temperature, ice mask and hemispheric index !-------------------------------------------------------------------- DO jj = 1, jpj ! ice if sst <= t-freez + ttest DO ji = 1, jpi IF( ( sst_m(ji,jj) - ( t_bo(ji,jj) - rt0 ) ) * tmask(ji,jj,1) >= rn_thres_sst ) THEN zswitch(ji,jj) = 0._wp * tmask(ji,jj,1) ! no ice ELSE zswitch(ji,jj) = 1._wp * tmask(ji,jj,1) ! ice ENDIF END DO END DO ! Hemispheric index DO jj = 1, jpj DO ji = 1, jpi IF( fcor(ji,jj) >= 0._wp ) THEN zhemis(ji,jj) = 1 ! Northern hemisphere ELSE zhemis(ji,jj) = 2 ! Southern hemisphere ENDIF END DO END DO !-------------------------------------------------------------------- ! 3) Initialization of sea ice state variables !-------------------------------------------------------------------- !----------------------------- ! 3.1) Hemisphere-dependent arrays !----------------------------- ! assign initial thickness, concentration, snow depth and salinity to an hemisphere-dependent array zht_i_ini(1) = rn_hti_ini_n ; zht_i_ini(2) = rn_hti_ini_s ! ice thickness zht_s_ini(1) = rn_hts_ini_n ; zht_s_ini(2) = rn_hts_ini_s ! snow depth zat_i_ini(1) = rn_ati_ini_n ; zat_i_ini(2) = rn_ati_ini_s ! ice concentration zsm_i_ini(1) = rn_smi_ini_n ; zsm_i_ini(2) = rn_smi_ini_s ! bulk ice salinity ztm_i_ini(1) = rn_tmi_ini_n ; ztm_i_ini(2) = rn_tmi_ini_s ! temperature (ice and snow) zvt_i_ini(:) = zht_i_ini(:) * zat_i_ini(:) ! ice volume !--------------------------------------------------------------------- ! 3.2) Distribute ice concentration and thickness into the categories !--------------------------------------------------------------------- ! a gaussian distribution for ice concentration is used ! then we check whether the distribution fullfills ! volume and area conservation, positivity and ice categories bounds DO i_hemis = 1, 2 ztest_1 = 0 ; ztest_2 = 0 ; ztest_3 = 0 ; ztest_4 = 0 ! note for the great nemo engineers: ! only very few of the WRITE statements are necessary for the reference version ! they were one day useful, but now i personally doubt of their ! potential for bringing anything useful DO i_fill = jpl, 1, -1 IF ( ( ztest_1 + ztest_2 + ztest_3 + ztest_4 ) .NE. 4 ) THEN !---------------------------- ! fill the i_fill categories !---------------------------- ! *** 1 category to fill IF ( i_fill .EQ. 1 ) THEN zh_i_ini(1,i_hemis) = zht_i_ini(i_hemis) za_i_ini(1,i_hemis) = zat_i_ini(i_hemis) zh_i_ini(2:jpl,i_hemis) = 0._wp za_i_ini(2:jpl,i_hemis) = 0._wp ELSE ! *** >1 categores to fill !--- Ice thicknesses in the i_fill - 1 first categories DO jl = 1, i_fill - 1 zh_i_ini(jl,i_hemis) = hi_mean(jl) END DO !--- jl0: most likely index where cc will be maximum DO jl = 1, jpl IF ( ( zht_i_ini(i_hemis) > hi_max(jl-1) ) .AND. & & ( zht_i_ini(i_hemis) <= hi_max(jl) ) ) THEN jl0 = jl ENDIF END DO jl0 = MIN(jl0, i_fill) !--- Concentrations za_i_ini(jl0,i_hemis) = zat_i_ini(i_hemis) / SQRT(REAL(jpl)) DO jl = 1, i_fill - 1 IF ( jl .NE. jl0 ) THEN zsigma = 0.5 * zht_i_ini(i_hemis) zarg = ( zh_i_ini(jl,i_hemis) - zht_i_ini(i_hemis) ) / zsigma za_i_ini(jl,i_hemis) = za_i_ini(jl0,i_hemis) * EXP(-zarg**2) ENDIF END DO zA = 0. ! sum of the areas in the jpl categories DO jl = 1, i_fill - 1 zA = zA + za_i_ini(jl,i_hemis) END DO za_i_ini(i_fill,i_hemis) = zat_i_ini(i_hemis) - zA ! ice conc in the last category IF ( i_fill .LT. jpl ) za_i_ini(i_fill+1:jpl, i_hemis) = 0._wp !--- Ice thickness in the last category zV = 0. ! sum of the volumes of the N-1 categories DO jl = 1, i_fill - 1 zV = zV + za_i_ini(jl,i_hemis)*zh_i_ini(jl,i_hemis) END DO zh_i_ini(i_fill,i_hemis) = ( zvt_i_ini(i_hemis) - zV ) / za_i_ini(i_fill,i_hemis) IF ( i_fill .LT. jpl ) zh_i_ini(i_fill+1:jpl, i_hemis) = 0._wp !--- volumes zv_i_ini(:,i_hemis) = za_i_ini(:,i_hemis) * zh_i_ini(:,i_hemis) IF ( i_fill .LT. jpl ) zv_i_ini(i_fill+1:jpl, i_hemis) = 0._wp ENDIF ! i_fill !--------------------- ! Compatibility tests !--------------------- ! Test 1: area conservation zA_cons = SUM(za_i_ini(:,i_hemis)) ; zconv = ABS(zat_i_ini(i_hemis) - zA_cons ) IF ( zconv .LT. 1.0e-6 ) THEN ztest_1 = 1 ELSE ztest_1 = 0 ENDIF ! Test 2: volume conservation zV_cons = SUM(zv_i_ini(:,i_hemis)) zconv = ABS(zvt_i_ini(i_hemis) - zV_cons) IF ( zconv .LT. 1.0e-6 ) THEN ztest_2 = 1 ELSE ztest_2 = 0 ENDIF ! Test 3: thickness of the last category is in-bounds ? IF ( zh_i_ini(i_fill, i_hemis) > hi_max(i_fill-1) ) THEN ztest_3 = 1 ELSE ztest_3 = 0 ENDIF ! Test 4: positivity of ice concentrations ztest_4 = 1 DO jl = 1, jpl IF ( za_i_ini(jl,i_hemis) .LT. 0._wp ) THEN ztest_4 = 0 ENDIF END DO ENDIF ! ztest_1 + ztest_2 + ztest_3 + ztest_4 ztests = ztest_1 + ztest_2 + ztest_3 + ztest_4 END DO ! i_fill IF(lwp) THEN WRITE(numout,*) ' ztests : ', ztests IF ( ztests .NE. 4 ) THEN WRITE(numout,*) WRITE(numout,*) ' !!!! ALERT !!! ' WRITE(numout,*) ' !!!! Something is wrong in the LIM3 initialization procedure ' WRITE(numout,*) WRITE(numout,*) ' *** ztests is not equal to 4 ' WRITE(numout,*) ' *** ztest_i (i=1,4) = ', ztest_1, ztest_2, ztest_3, ztest_4 WRITE(numout,*) ' zat_i_ini : ', zat_i_ini(i_hemis) WRITE(numout,*) ' zht_i_ini : ', zht_i_ini(i_hemis) ENDIF ! ztests .NE. 4 ENDIF END DO ! i_hemis !--------------------------------------------------------------------- ! 3.3) Space-dependent arrays for ice state variables !--------------------------------------------------------------------- ! Ice concentration, thickness and volume, ice salinity, ice age, surface temperature DO jl = 1, jpl ! loop over categories DO jj = 1, jpj DO ji = 1, jpi a_i(ji,jj,jl) = zswitch(ji,jj) * za_i_ini (jl,zhemis(ji,jj)) ! concentration ht_i(ji,jj,jl) = zswitch(ji,jj) * zh_i_ini(jl,zhemis(ji,jj)) ! ice thickness ht_s(ji,jj,jl) = ht_i(ji,jj,jl) * ( zht_s_ini( zhemis(ji,jj) ) / zht_i_ini( zhemis(ji,jj) ) ) ! snow depth sm_i(ji,jj,jl) = zswitch(ji,jj) * zsm_i_ini(zhemis(ji,jj)) ! salinity o_i(ji,jj,jl) = zswitch(ji,jj) * 1._wp ! age (1 day) t_su(ji,jj,jl) = zswitch(ji,jj) * ztm_i_ini(zhemis(ji,jj)) + ( 1._wp - zswitch(ji,jj) ) * rt0 ! surf temp ! This case below should not be used if (ht_s/ht_i) is ok in namelist ! In case snow load is in excess that would lead to transformation from snow to ice ! Then, transfer the snow excess into the ice (different from limthd_dh) zdh = MAX( 0._wp, ( rhosn * ht_s(ji,jj,jl) + ( rhoic - rau0 ) * ht_i(ji,jj,jl) ) * r1_rau0 ) ! recompute ht_i, ht_s avoiding out of bounds values ht_i(ji,jj,jl) = MIN( hi_max(jl), ht_i(ji,jj,jl) + zdh ) ht_s(ji,jj,jl) = MAX( 0._wp, ht_s(ji,jj,jl) - zdh * rhoic * r1_rhosn ) ! ice volume, salt content, age content v_i(ji,jj,jl) = ht_i(ji,jj,jl) * a_i(ji,jj,jl) ! ice volume v_s(ji,jj,jl) = ht_s(ji,jj,jl) * a_i(ji,jj,jl) ! snow volume smv_i(ji,jj,jl) = MIN( sm_i(ji,jj,jl) , sss_m(ji,jj) ) * v_i(ji,jj,jl) ! salt content oa_i(ji,jj,jl) = o_i(ji,jj,jl) * a_i(ji,jj,jl) ! age content END DO END DO END DO ! for constant salinity in time IF( nn_icesal == 1 .OR. nn_icesal == 3 ) THEN CALL lim_var_salprof smv_i = sm_i * v_i ENDIF ! Snow temperature and heat content DO jk = 1, nlay_s DO jl = 1, jpl ! loop over categories DO jj = 1, jpj DO ji = 1, jpi t_s(ji,jj,jk,jl) = zswitch(ji,jj) * ztm_i_ini(zhemis(ji,jj)) + ( 1._wp - zswitch(ji,jj) ) * rt0 ! Snow energy of melting e_s(ji,jj,jk,jl) = zswitch(ji,jj) * rhosn * ( cpic * ( rt0 - t_s(ji,jj,jk,jl) ) + lfus ) ! Mutliply by volume, and divide by number of layers to get heat content in J/m2 e_s(ji,jj,jk,jl) = e_s(ji,jj,jk,jl) * v_s(ji,jj,jl) * r1_nlay_s END DO END DO END DO END DO ! Ice salinity, temperature and heat content DO jk = 1, nlay_i DO jl = 1, jpl ! loop over categories DO jj = 1, jpj DO ji = 1, jpi t_i(ji,jj,jk,jl) = zswitch(ji,jj) * ztm_i_ini(zhemis(ji,jj)) + ( 1._wp - zswitch(ji,jj) ) * rt0 s_i(ji,jj,jk,jl) = zswitch(ji,jj) * zsm_i_ini(zhemis(ji,jj)) !+ ( 1._wp - zswitch(ji,jj) ) * rn_simin ztmelts = - tmut * s_i(ji,jj,jk,jl) + rt0 !Melting temperature in K ! heat content per unit volume e_i(ji,jj,jk,jl) = zswitch(ji,jj) * rhoic * ( cpic * ( ztmelts - t_i(ji,jj,jk,jl) ) & + lfus * ( 1._wp - (ztmelts-rt0) / MIN((t_i(ji,jj,jk,jl)-rt0),-epsi20) ) & - rcp * ( ztmelts - rt0 ) ) ! Mutliply by ice volume, and divide by number of layers to get heat content in J/m2 e_i(ji,jj,jk,jl) = e_i(ji,jj,jk,jl) * v_i(ji,jj,jl) * r1_nlay_i END DO END DO END DO END DO tn_ice (:,:,:) = t_su (:,:,:) ELSE ! if ln_iceini=false a_i (:,:,:) = 0._wp v_i (:,:,:) = 0._wp v_s (:,:,:) = 0._wp smv_i(:,:,:) = 0._wp oa_i (:,:,:) = 0._wp ht_i (:,:,:) = 0._wp ht_s (:,:,:) = 0._wp sm_i (:,:,:) = 0._wp o_i (:,:,:) = 0._wp e_i(:,:,:,:) = 0._wp e_s(:,:,:,:) = 0._wp DO jl = 1, jpl DO jk = 1, nlay_i t_i(:,:,jk,jl) = rt0 * tmask(:,:,1) END DO DO jk = 1, nlay_s t_s(:,:,jk,jl) = rt0 * tmask(:,:,1) END DO END DO ENDIF ! ln_iceini at_i (:,:) = 0.0_wp DO jl = 1, jpl at_i (:,:) = at_i (:,:) + a_i (:,:,jl) END DO ! !-------------------------------------------------------------------- ! 4) Global ice variables for output diagnostics | !-------------------------------------------------------------------- u_ice (:,:) = 0._wp v_ice (:,:) = 0._wp stress1_i(:,:) = 0._wp stress2_i(:,:) = 0._wp stress12_i(:,:) = 0._wp !-------------------------------------------------------------------- ! 5) Moments for advection !-------------------------------------------------------------------- sxopw (:,:) = 0._wp syopw (:,:) = 0._wp sxxopw(:,:) = 0._wp syyopw(:,:) = 0._wp sxyopw(:,:) = 0._wp sxice (:,:,:) = 0._wp ; sxsn (:,:,:) = 0._wp ; sxa (:,:,:) = 0._wp syice (:,:,:) = 0._wp ; sysn (:,:,:) = 0._wp ; sya (:,:,:) = 0._wp sxxice(:,:,:) = 0._wp ; sxxsn(:,:,:) = 0._wp ; sxxa (:,:,:) = 0._wp syyice(:,:,:) = 0._wp ; syysn(:,:,:) = 0._wp ; syya (:,:,:) = 0._wp sxyice(:,:,:) = 0._wp ; sxysn(:,:,:) = 0._wp ; sxya (:,:,:) = 0._wp sxc0 (:,:,:) = 0._wp ; sxe (:,:,:,:)= 0._wp syc0 (:,:,:) = 0._wp ; sye (:,:,:,:)= 0._wp sxxc0 (:,:,:) = 0._wp ; sxxe (:,:,:,:)= 0._wp syyc0 (:,:,:) = 0._wp ; syye (:,:,:,:)= 0._wp sxyc0 (:,:,:) = 0._wp ; sxye (:,:,:,:)= 0._wp sxsal (:,:,:) = 0._wp sysal (:,:,:) = 0._wp sxxsal (:,:,:) = 0._wp syysal (:,:,:) = 0._wp sxysal (:,:,:) = 0._wp sxage (:,:,:) = 0._wp syage (:,:,:) = 0._wp sxxage (:,:,:) = 0._wp syyage (:,:,:) = 0._wp sxyage (:,:,:) = 0._wp CALL wrk_dealloc( jpi, jpj, zswitch ) CALL wrk_dealloc( jpi, jpj, zhemis ) CALL wrk_dealloc( jpl, 2, zh_i_ini, za_i_ini, zv_i_ini ) CALL wrk_dealloc( 2, zht_i_ini, zat_i_ini, zvt_i_ini, zht_s_ini, zsm_i_ini, ztm_i_ini ) END SUBROUTINE lim_istate SUBROUTINE lim_istate_init !!------------------------------------------------------------------- !! *** ROUTINE lim_istate_init *** !! !! ** Purpose : Definition of initial state of the ice !! !! ** Method : Read the namiceini namelist and check the parameter !! values called at the first timestep (nit000) !! !! ** input : !! Namelist namiceini !! !! history : !! 8.5 ! 03-08 (C. Ethe) original code !! 8.5 ! 07-11 (M. Vancoppenolle) rewritten initialization !!----------------------------------------------------------------------------- NAMELIST/namiceini/ ln_iceini, rn_thres_sst, rn_hts_ini_n, rn_hts_ini_s, rn_hti_ini_n, rn_hti_ini_s, & & rn_ati_ini_n, rn_ati_ini_s, rn_smi_ini_n, rn_smi_ini_s, rn_tmi_ini_n, rn_tmi_ini_s INTEGER :: ios ! Local integer output status for namelist read !!----------------------------------------------------------------------------- ! REWIND( numnam_ice_ref ) ! Namelist namiceini in reference namelist : Ice initial state READ ( numnam_ice_ref, namiceini, IOSTAT = ios, ERR = 901) 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namiceini in reference namelist', lwp ) REWIND( numnam_ice_cfg ) ! Namelist namiceini in configuration namelist : Ice initial state READ ( numnam_ice_cfg, namiceini, IOSTAT = ios, ERR = 902 ) 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namiceini in configuration namelist', lwp ) IF(lwm) WRITE ( numoni, namiceini ) ! Define the initial parameters ! ------------------------- IF(lwp) THEN WRITE(numout,*) WRITE(numout,*) 'lim_istate_init : ice parameters inititialisation ' WRITE(numout,*) '~~~~~~~~~~~~~~~' WRITE(numout,*) ' initialization with ice (T) or not (F) ln_iceini = ', ln_iceini WRITE(numout,*) ' threshold water temp. for initial sea-ice rn_thres_sst = ', rn_thres_sst WRITE(numout,*) ' initial snow thickness in the north rn_hts_ini_n = ', rn_hts_ini_n WRITE(numout,*) ' initial snow thickness in the south rn_hts_ini_s = ', rn_hts_ini_s WRITE(numout,*) ' initial ice thickness in the north rn_hti_ini_n = ', rn_hti_ini_n WRITE(numout,*) ' initial ice thickness in the south rn_hti_ini_s = ', rn_hti_ini_s WRITE(numout,*) ' initial ice concentr. in the north rn_ati_ini_n = ', rn_ati_ini_n WRITE(numout,*) ' initial ice concentr. in the north rn_ati_ini_s = ', rn_ati_ini_s WRITE(numout,*) ' initial ice salinity in the north rn_smi_ini_n = ', rn_smi_ini_n WRITE(numout,*) ' initial ice salinity in the south rn_smi_ini_s = ', rn_smi_ini_s WRITE(numout,*) ' initial ice/snw temp in the north rn_tmi_ini_n = ', rn_tmi_ini_n WRITE(numout,*) ' initial ice/snw temp in the south rn_tmi_ini_s = ', rn_tmi_ini_s ENDIF END SUBROUTINE lim_istate_init #else !!---------------------------------------------------------------------- !! Default option : Empty module NO LIM sea-ice model !!---------------------------------------------------------------------- CONTAINS SUBROUTINE lim_istate ! Empty routine END SUBROUTINE lim_istate #endif !!====================================================================== END MODULE limistate