MODULE iceforcing !!====================================================================== !! *** MODULE iceforcing *** !! call surface forcing for sea ice model !!===================================================================== !! History : 4.0 ! 2017-08 (C. Rousset) Original code !!---------------------------------------------------------------------- #if defined key_lim3 !!---------------------------------------------------------------------- !! 'key_lim3' : LIM 3.0 sea-ice model !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers USE dom_oce ! ocean space and time domain USE ice ! LIM-3: ice variables ! USE sbc_oce ! Surface boundary condition: ocean fields USE sbc_ice ! Surface boundary condition: ice fields USE usrdef_sbc ! user defined: surface boundary condition USE sbcblk ! Surface boundary condition: bulk USE sbccpl ! Surface boundary condition: coupled interface USE icealbedo ! ice albedo ! USE iom ! I/O manager library USE in_out_manager ! I/O manager USE lbclnk ! lateral boundary condition - MPP link USE lib_mpp ! MPP library USE lib_fortran ! USE timing ! Timing IMPLICIT NONE PRIVATE PUBLIC ice_forcing_tau ! routine called by icestp.F90 PUBLIC ice_forcing_flx ! routine called by icestp.F90 !! * Substitutions # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 4.0 , UCL NEMO Consortium (2011) !! $Id: icestp.F90 8319 2017-07-11 15:00:44Z clem $ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE ice_forcing_tau( kt, ksbc, utau_ice, vtau_ice ) !!--------------------------------------------------------------------- !! *** ROUTINE ice_forcing_tau *** !! !! ** Purpose : provide surface boundary condition for sea ice (momentum) !! !! ** Action : It provides the following fields: !! utau_ice, vtau_ice : surface ice stress (U- & V-points) [N/m2] !!--------------------------------------------------------------------- INTEGER, INTENT(in) :: kt ! ocean time step INTEGER, INTENT(in) :: ksbc ! type of sbc flux ( 1 = user defined formulation, ! 3 = bulk formulation, ! 4 = Pure Coupled formulation) REAL(wp), DIMENSION(jpi,jpj), INTENT(out) :: utau_ice, vtau_ice !! INTEGER :: ji, jj ! dummy loop index REAL(wp), DIMENSION(jpi,jpj) :: zutau_ice, zvtau_ice !!---------------------------------------------------------------------- IF( nn_timing == 1 ) CALL timing_start('ice_forcing_tau') SELECT CASE( ksbc ) CASE( jp_usr ) ; CALL usrdef_sbc_ice_tau( kt ) ! user defined formulation CASE( jp_blk ) ; CALL blk_ice_tau ! Bulk formulation CASE( jp_purecpl ) ; CALL sbc_cpl_ice_tau( utau_ice , vtau_ice ) ! Coupled formulation END SELECT IF( ln_mixcpl) THEN ! Case of a mixed Bulk/Coupled formulation CALL sbc_cpl_ice_tau( zutau_ice , zvtau_ice ) DO jj = 2, jpjm1 DO ji = 2, jpim1 utau_ice(ji,jj) = utau_ice(ji,jj) * xcplmask(ji,jj,0) + zutau_ice(ji,jj) * ( 1. - xcplmask(ji,jj,0) ) vtau_ice(ji,jj) = vtau_ice(ji,jj) * xcplmask(ji,jj,0) + zvtau_ice(ji,jj) * ( 1. - xcplmask(ji,jj,0) ) END DO END DO CALL lbc_lnk( utau_ice, 'U', -1. ) CALL lbc_lnk( vtau_ice, 'V', -1. ) ENDIF IF( nn_timing == 1 ) CALL timing_stop('ice_forcing_tau') ! END SUBROUTINE ice_forcing_tau SUBROUTINE ice_forcing_flx( kt, ksbc ) !!--------------------------------------------------------------------- !! *** ROUTINE ice_forcing_flx *** !! !! ** Purpose : provide surface boundary condition for sea ice (flux) !! !! ** Action : It provides the following fields used in sea ice model: !! fr1_i0 , fr2_i0 = 1sr & 2nd fraction of qsr penetration in ice [%] !! emp_oce , emp_ice = E-P over ocean and sea ice [Kg/m2/s] !! sprecip = solid precipitation [Kg/m2/s] !! evap_ice = sublimation [Kg/m2/s] !! qsr_tot , qns_tot = solar & non solar heat flux (total) [W/m2] !! qsr_ice , qns_ice = solar & non solar heat flux over ice [W/m2] !! dqns_ice = non solar heat sensistivity [W/m2] !! qemp_oce, qemp_ice, qprec_ice, qevap_ice = sensible heat (associated with evap & precip) [W/m2] !! + some fields that are not used outside this module: !! qla_ice = latent heat flux over ice [W/m2] !! dqla_ice = latent heat sensistivity [W/m2] !! tprecip = total precipitation [Kg/m2/s] !! alb_ice = albedo above sea ice !!--------------------------------------------------------------------- INTEGER, INTENT(in) :: kt ! ocean time step INTEGER, INTENT(in) :: ksbc ! type of sbc flux ( 1 = user defined formulation, ! 3 = bulk formulation, ! 4 = Pure Coupled formulation) INTEGER :: ji, jj, jl ! dummy loop index REAL(wp), DIMENSION(jpi,jpj,jpl) :: zalb_os, zalb_cs ! ice albedo under overcast/clear sky REAL(wp), DIMENSION(jpi,jpj) :: zalb ! 2D workspace !!---------------------------------------------------------------------- IF( nn_timing == 1 ) CALL timing_start('ice_forcing_flx') ! --- cloud-sky and overcast-sky ice albedos --- ! CALL ice_albedo( t_su, ht_i, ht_s, a_ip_frac, h_ip, ln_pnd_rad, zalb_cs, zalb_os ) ! albedo depends on cloud fraction because of non-linear spectral effects DO jl = 1, jpl DO jj = 2, jpjm1 DO ji = 2, jpim1 alb_ice(ji,jj,jl) = ( 1. - cldf_ice ) * zalb_cs(ji,jj,jl) + cldf_ice * zalb_os(ji,jj,jl) END DO END DO END DO CALL lbc_lnk( alb_ice, 'T', 1. ) ! --- fluxes over sea ice --- ! SELECT CASE( ksbc ) CASE( jp_usr ) ! user defined formulation CALL usrdef_sbc_ice_flx( kt ) CASE( jp_blk ) ! bulk formulation CALL blk_ice_flx( t_su, alb_ice ) IF( ln_mixcpl ) CALL sbc_cpl_ice_flx( picefr=at_i_b, palbi=alb_ice, psst=sst_m, pist=t_su ) IF( nn_limflx /= 2 ) CALL ice_lim_flx( t_su, alb_ice, qns_ice, qsr_ice, dqns_ice, evap_ice, devap_ice, nn_limflx ) CASE ( jp_purecpl ) ! coupled formulation CALL sbc_cpl_ice_flx( picefr=at_i_b, palbi=alb_ice, psst=sst_m, pist=t_su ) IF( nn_limflx == 2 ) CALL ice_lim_flx( t_su, alb_ice, qns_ice, qsr_ice, dqns_ice, evap_ice, devap_ice, nn_limflx ) END SELECT ! --- albedo output --- ! WHERE( at_i_b <= epsi06 ) ; zalb(:,:) = rn_alb_oce ELSEWHERE ; zalb(:,:) = SUM( alb_ice * a_i_b, dim=3 ) / at_i_b END WHERE IF( iom_use('icealb' ) ) CALL iom_put( "icealb" , zalb(:,:) ) ! ice albedo zalb(:,:) = SUM( alb_ice * a_i_b, dim=3 ) + rn_alb_oce * ( 1._wp - at_i_b ) IF( iom_use('albedo' ) ) CALL iom_put( "albedo" , zalb(:,:) ) ! surface albedo ! ! IF( nn_timing == 1 ) CALL timing_stop('ice_forcing_flx') END SUBROUTINE ice_forcing_flx SUBROUTINE ice_lim_flx( ptn_ice, palb_ice, pqns_ice, pqsr_ice, pdqn_ice, pevap_ice, pdevap_ice, k_limflx ) !!--------------------------------------------------------------------- !! *** ROUTINE ice_lim_flx *** !! !! ** Purpose : update the ice surface boundary condition by averaging and / or !! redistributing fluxes on ice categories !! !! ** Method : average then redistribute !! !! ** Action : !!--------------------------------------------------------------------- INTEGER , INTENT(in ) :: k_limflx ! =-1 do nothing; =0 average ; ! ! = 1 average and redistribute ; =2 redistribute REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: ptn_ice ! ice surface temperature REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb_ice ! ice albedo REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pqns_ice ! non solar flux REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pqsr_ice ! net solar flux REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pdqn_ice ! non solar flux sensitivity REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pevap_ice ! sublimation REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pdevap_ice ! sublimation sensitivity ! INTEGER :: jl ! dummy loop index ! REAL(wp), DIMENSION(jpi,jpj) :: zalb_m ! Mean albedo over all categories REAL(wp), DIMENSION(jpi,jpj) :: ztem_m ! Mean temperature over all categories ! REAL(wp), DIMENSION(jpi,jpj) :: z_qsr_m ! Mean solar heat flux over all categories REAL(wp), DIMENSION(jpi,jpj) :: z_qns_m ! Mean non solar heat flux over all categories REAL(wp), DIMENSION(jpi,jpj) :: z_evap_m ! Mean sublimation over all categories REAL(wp), DIMENSION(jpi,jpj) :: z_dqn_m ! Mean d(qns)/dT over all categories REAL(wp), DIMENSION(jpi,jpj) :: z_devap_m ! Mean d(evap)/dT over all categories !!---------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('ice_lim_flx') ! SELECT CASE( k_limflx ) !== averaged on all ice categories ==! CASE( 0 , 1 ) ! z_qns_m (:,:) = fice_ice_ave ( pqns_ice (:,:,:) ) z_qsr_m (:,:) = fice_ice_ave ( pqsr_ice (:,:,:) ) z_dqn_m (:,:) = fice_ice_ave ( pdqn_ice (:,:,:) ) z_evap_m (:,:) = fice_ice_ave ( pevap_ice (:,:,:) ) z_devap_m(:,:) = fice_ice_ave ( pdevap_ice (:,:,:) ) DO jl = 1, jpl pdqn_ice (:,:,jl) = z_dqn_m(:,:) pdevap_ice(:,:,jl) = z_devap_m(:,:) END DO ! DO jl = 1, jpl pqns_ice (:,:,jl) = z_qns_m(:,:) pqsr_ice (:,:,jl) = z_qsr_m(:,:) pevap_ice(:,:,jl) = z_evap_m(:,:) END DO ! END SELECT ! SELECT CASE( k_limflx ) !== redistribution on all ice categories ==! CASE( 1 , 2 ) ! zalb_m(:,:) = fice_ice_ave ( palb_ice (:,:,:) ) ztem_m(:,:) = fice_ice_ave ( ptn_ice (:,:,:) ) DO jl = 1, jpl pqns_ice (:,:,jl) = pqns_ice (:,:,jl) + pdqn_ice (:,:,jl) * ( ptn_ice(:,:,jl) - ztem_m(:,:) ) pevap_ice(:,:,jl) = pevap_ice(:,:,jl) + pdevap_ice(:,:,jl) * ( ptn_ice(:,:,jl) - ztem_m(:,:) ) pqsr_ice (:,:,jl) = pqsr_ice (:,:,jl) * ( 1._wp - palb_ice(:,:,jl) ) / ( 1._wp - zalb_m(:,:) ) END DO ! END SELECT ! IF( nn_timing == 1 ) CALL timing_stop('ice_lim_flx') ! END SUBROUTINE ice_lim_flx FUNCTION fice_cell_ave ( ptab ) !!-------------------------------------------------------------------------- !! * Compute average over categories, for grid cell (ice covered and free ocean) !!-------------------------------------------------------------------------- REAL(wp), DIMENSION(jpi,jpj) :: fice_cell_ave REAL(wp), DIMENSION(jpi,jpj,jpl), INTENT (in) :: ptab INTEGER :: jl !!-------------------------------------------------------------------------- fice_cell_ave (:,:) = 0._wp DO jl = 1, jpl fice_cell_ave (:,:) = fice_cell_ave (:,:) + a_i (:,:,jl) * ptab (:,:,jl) END DO END FUNCTION fice_cell_ave FUNCTION fice_ice_ave ( ptab ) !!-------------------------------------------------------------------------- !! * Compute average over categories, for ice covered part of grid cell !!-------------------------------------------------------------------------- REAL(wp), DIMENSION(jpi,jpj) :: fice_ice_ave REAL(wp), DIMENSION(jpi,jpj,jpl), INTENT(in) :: ptab !!-------------------------------------------------------------------------- WHERE ( at_i (:,:) > 0.0_wp ) ; fice_ice_ave (:,:) = fice_cell_ave( ptab (:,:,:) ) / at_i (:,:) ELSEWHERE ; fice_ice_ave (:,:) = 0.0_wp END WHERE END FUNCTION fice_ice_ave #endif !!====================================================================== END MODULE iceforcing