| 1 | MODULE sbcice_if |
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| 2 | !!====================================================================== |
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| 3 | !! *** MODULE sbcice *** |
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| 4 | !! Surface module : update surface ocean boundary condition over ice |
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| 5 | !! covered area using ice-if model |
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| 6 | !!====================================================================== |
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| 7 | !! History : 3.0 ! 2006-06 (G. Madec) Original code |
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| 8 | !!---------------------------------------------------------------------- |
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| 9 | |
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| 10 | !!---------------------------------------------------------------------- |
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| 11 | !! sbc_ice_if : update sbc in ice-covered area |
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| 12 | !!---------------------------------------------------------------------- |
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| 13 | USE oce ! ocean dynamics and tracers |
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| 14 | USE dom_oce ! ocean space and time domain |
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| 15 | USE phycst ! physical constants |
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| 16 | USE eosbn2 ! equation of state |
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| 17 | USE sbc_oce ! surface boundary condition: ocean fields |
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| 18 | #if defined key_lim3 |
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| 19 | USE ice , ONLY : a_i |
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| 20 | #else |
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| 21 | USE sbc_ice, ONLY : a_i |
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| 22 | #endif |
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| 23 | USE fldread ! read input field |
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| 24 | USE iom ! I/O manager library |
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| 25 | USE in_out_manager ! I/O manager |
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| 26 | USE lib_mpp ! MPP library |
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| 27 | USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) |
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| 28 | |
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| 29 | USE yomhook, ONLY: lhook, dr_hook |
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| 30 | USE parkind1, ONLY: jprb, jpim |
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| 31 | |
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| 32 | IMPLICIT NONE |
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| 33 | PRIVATE |
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| 34 | |
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| 35 | PUBLIC sbc_ice_if ! routine called in sbcmod |
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| 36 | |
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| 37 | TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf_ice ! structure of input ice-cover (file informations, fields read) |
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| 38 | |
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| 39 | !! * Substitutions |
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| 40 | # include "domzgr_substitute.h90" |
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| 41 | !!---------------------------------------------------------------------- |
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| 42 | !! NEMO/OPA 3.3 , NEMO Consortium (2010) |
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| 43 | !! $Id$ |
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| 44 | !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) |
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| 45 | !!---------------------------------------------------------------------- |
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| 46 | CONTAINS |
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| 47 | |
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| 48 | SUBROUTINE sbc_ice_if( kt ) |
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| 49 | !!--------------------------------------------------------------------- |
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| 50 | !! *** ROUTINE sbc_ice_if *** |
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| 51 | !! |
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| 52 | !! ** Purpose : handle surface boundary condition over ice cover area |
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| 53 | !! when sea-ice model are not used |
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| 54 | !! |
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| 55 | !! ** Method : - read sea-ice cover climatology |
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| 56 | !! - blah blah blah, ... |
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| 57 | !! |
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| 58 | !! ** Action : utau, vtau : remain unchanged |
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| 59 | !! taum, wndm : remain unchanged |
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| 60 | !! qns, qsr : update heat flux below sea-ice |
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| 61 | !! emp, sfx : update freshwater flux below sea-ice |
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| 62 | !! fr_i : update the ice fraction |
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| 63 | !!--------------------------------------------------------------------- |
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| 64 | INTEGER, INTENT(in) :: kt ! ocean time step |
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| 65 | ! |
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| 66 | INTEGER :: ji, jj ! dummy loop indices |
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| 67 | INTEGER :: ierror ! return error code |
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| 68 | INTEGER :: ios ! Local integer output status for namelist read |
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| 69 | REAL(wp) :: ztrp, zsice, zt_fzp, zfr_obs |
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| 70 | REAL(wp) :: zqri, zqrj, zqrp, zqi |
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| 71 | !! |
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| 72 | CHARACTER(len=100) :: cn_dir ! Root directory for location of ice-if files |
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| 73 | TYPE(FLD_N) :: sn_ice ! informations about the fields to be read |
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| 74 | NAMELIST/namsbc_iif/ cn_dir, sn_ice |
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| 75 | INTEGER(KIND=jpim), PARAMETER :: zhook_in = 0 |
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| 76 | INTEGER(KIND=jpim), PARAMETER :: zhook_out = 1 |
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| 77 | REAL(KIND=jprb) :: zhook_handle |
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| 78 | |
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| 79 | CHARACTER(LEN=*), PARAMETER :: RoutineName='SBC_ICE_IF' |
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| 80 | |
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| 81 | IF (lhook) CALL dr_hook(RoutineName,zhook_in,zhook_handle) |
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| 82 | |
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| 83 | !!--------------------------------------------------------------------- |
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| 84 | ! ! ====================== ! |
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| 85 | IF( kt == nit000 ) THEN ! First call kt=nit000 ! |
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| 86 | ! ! ====================== ! |
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| 87 | ! set file information |
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| 88 | REWIND( numnam_ref ) ! Namelist namsbc_iif in reference namelist : Ice if file |
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| 89 | READ ( numnam_ref, namsbc_iif, IOSTAT = ios, ERR = 901) |
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| 90 | 901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_iif in reference namelist', lwp ) |
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| 91 | |
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| 92 | REWIND( numnam_cfg ) ! Namelist Namelist namsbc_iif in configuration namelist : Ice if file |
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| 93 | READ ( numnam_cfg, namsbc_iif, IOSTAT = ios, ERR = 902 ) |
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| 94 | 902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_iif in configuration namelist', lwp ) |
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| 95 | IF(lwm) WRITE ( numond, namsbc_iif ) |
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| 96 | |
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| 97 | ALLOCATE( sf_ice(1), STAT=ierror ) |
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| 98 | IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_ice_if: unable to allocate sf_ice structure' ) |
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| 99 | ALLOCATE( sf_ice(1)%fnow(jpi,jpj,1) ) |
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| 100 | IF( sn_ice%ln_tint ) ALLOCATE( sf_ice(1)%fdta(jpi,jpj,1,2) ) |
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| 101 | |
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| 102 | ! fill sf_ice with sn_ice and control print |
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| 103 | CALL fld_fill( sf_ice, (/ sn_ice /), cn_dir, 'sbc_ice_if', 'ice-if sea-ice model', 'namsbc_iif' ) |
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| 104 | ! |
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| 105 | ENDIF |
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| 106 | |
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| 107 | CALL fld_read( kt, nn_fsbc, sf_ice ) ! Read input fields and provides the |
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| 108 | ! ! input fields at the current time-step |
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| 109 | |
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| 110 | IF( MOD( kt-1, nn_fsbc) == 0 ) THEN |
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| 111 | ! |
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| 112 | ztrp = -40. ! restoring terme for temperature (w/m2/k) |
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| 113 | zsice = - 0.04 / 0.8 ! ratio of isohaline compressibility over isotherme compressibility |
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| 114 | ! ( d rho / dt ) / ( d rho / ds ) ( s = 34, t = -1.8 ) |
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| 115 | |
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| 116 | CALL eos_fzp( sss_m(:,:), fr_i(:,:) ) ! sea surface freezing temperature [Celcius] |
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| 117 | fr_i(:,:) = fr_i(:,:) * tmask(:,:,1) |
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| 118 | |
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| 119 | IF( ln_cpl ) a_i(:,:,1) = fr_i(:,:) |
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| 120 | |
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| 121 | ! Flux and ice fraction computation |
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| 122 | DO jj = 1, jpj |
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| 123 | DO ji = 1, jpi |
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| 124 | ! |
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| 125 | zt_fzp = fr_i(ji,jj) ! freezing point temperature |
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| 126 | zfr_obs = sf_ice(1)%fnow(ji,jj,1) ! observed ice cover |
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| 127 | ! ! ocean ice fraction (0/1) from the freezing point temperature |
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| 128 | IF( sst_m(ji,jj) <= zt_fzp ) THEN ; fr_i(ji,jj) = 1.e0 |
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| 129 | ELSE ; fr_i(ji,jj) = 0.e0 |
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| 130 | ENDIF |
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| 131 | |
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| 132 | tsn(ji,jj,1,jp_tem) = MAX( tsn(ji,jj,1,jp_tem), zt_fzp ) ! avoid over-freezing point temperature |
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| 133 | |
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| 134 | qsr(ji,jj) = ( 1. - zfr_obs ) * qsr(ji,jj) ! solar heat flux : zero below observed ice cover |
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| 135 | |
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| 136 | ! ! non solar heat flux : add a damping term |
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| 137 | ! # ztrp*(t-(tgel-1.)) if observed ice and no opa ice (zfr_obs=1 fr_i=0) |
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| 138 | ! # ztrp*min(0,t-tgel) if observed ice and opa ice (zfr_obs=1 fr_i=1) |
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| 139 | zqri = ztrp * ( tsb(ji,jj,1,jp_tem) - ( zt_fzp - 1.) ) |
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| 140 | zqrj = ztrp * MIN( 0., tsb(ji,jj,1,jp_tem) - zt_fzp ) |
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| 141 | zqrp = ( zfr_obs * ( (1. - fr_i(ji,jj) ) * zqri & |
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| 142 | & + fr_i(ji,jj) * zqrj ) ) * tmask(ji,jj,1) |
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| 143 | |
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| 144 | ! ! non-solar heat flux |
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| 145 | ! # qns unchanged if no climatological ice (zfr_obs=0) |
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| 146 | ! # qns = zqrp if climatological ice and no opa ice (zfr_obs=1, fr_i=0) |
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| 147 | ! # qns = zqrp -2(-4) watt/m2 if climatological ice and opa ice (zfr_obs=1, fr_i=1) |
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| 148 | ! (-2=arctic, -4=antarctic) |
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| 149 | zqi = -3. + SIGN( 1.e0, ff(ji,jj) ) |
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| 150 | qns(ji,jj) = ( ( 1.- zfr_obs ) * qns(ji,jj) & |
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| 151 | & + zfr_obs * fr_i(ji,jj) * zqi ) * tmask(ji,jj,1) & |
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| 152 | & + zqrp |
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| 153 | END DO |
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| 154 | END DO |
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| 155 | ! |
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| 156 | ENDIF |
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| 157 | ! |
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| 158 | IF (lhook) CALL dr_hook(RoutineName,zhook_out,zhook_handle) |
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| 159 | END SUBROUTINE sbc_ice_if |
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| 160 | |
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| 161 | !!====================================================================== |
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| 162 | END MODULE sbcice_if |
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