MODULE iceupdate !!====================================================================== !! *** MODULE iceupdate *** !! Sea-ice : computation of the flux at the sea ice/ocean interface !!====================================================================== !! History : 4.0 ! 2018 (many people) SI3 [aka Sea Ice cube] !!---------------------------------------------------------------------- #if defined key_si3 !!---------------------------------------------------------------------- !! 'key_si3' SI3 sea-ice model !!---------------------------------------------------------------------- !! ice_update_alloc : allocate the iceupdate arrays !! ice_update_init : initialisation !! ice_update_flx : updates mass, heat and salt fluxes at the ocean surface !! ice_update_tau : update i- and j-stresses, and its modulus at the ocean surface !!---------------------------------------------------------------------- USE oce , ONLY : sshn, sshb USE phycst ! physical constants USE dom_oce ! ocean domain USE ice ! sea-ice: variables USE sbc_ice ! Surface boundary condition: ice fields USE sbc_oce ! Surface boundary condition: ocean fields USE sbccpl ! Surface boundary condition: coupled interface USE icealb ! sea-ice: albedo parameters USE traqsr ! add penetration of solar flux in the calculation of heat budget USE icectl ! sea-ice: control prints USE bdy_oce , ONLY : ln_bdy ! USE in_out_manager ! I/O manager USE iom ! I/O manager library USE lib_mpp ! MPP library USE lib_fortran ! fortran utilities (glob_sum + no signed zero) USE lbclnk ! lateral boundary conditions (or mpp links) USE timing ! Timing IMPLICIT NONE PRIVATE PUBLIC ice_update_init ! called by ice_init PUBLIC ice_update_flx ! called by ice_stp PUBLIC ice_update_tau ! called by ice_stp REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: utau_oce, vtau_oce ! air-ocean surface i- & j-stress [N/m2] REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: tmod_io ! modulus of the ice-ocean velocity [m/s] !! * Substitutions # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/ICE 4.0 , NEMO Consortium (2018) !! $Id: iceupdate.F90 8411 2017-08-07 16:09:12Z clem $ !! Software governed by the CeCILL licence (./LICENSE) !!---------------------------------------------------------------------- CONTAINS INTEGER FUNCTION ice_update_alloc() !!------------------------------------------------------------------- !! *** ROUTINE ice_update_alloc *** !!------------------------------------------------------------------- ALLOCATE( utau_oce(jpi,jpj), vtau_oce(jpi,jpj), tmod_io(jpi,jpj), STAT=ice_update_alloc ) ! IF( lk_mpp ) CALL mpp_sum( ice_update_alloc ) IF( ice_update_alloc /= 0 ) CALL ctl_warn('ice_update_alloc: failed to allocate arrays') ! END FUNCTION ice_update_alloc SUBROUTINE ice_update_flx( kt ) !!------------------------------------------------------------------- !! *** ROUTINE ice_update_flx *** !! !! ** Purpose : Update the surface ocean boundary condition for heat !! salt and mass over areas where sea-ice is non-zero !! !! ** Action : - computes the heat and freshwater/salt fluxes !! at the ice-ocean interface. !! - Update the ocean sbc !! !! ** Outputs : - qsr : sea heat flux: solar !! - qns : sea heat flux: non solar !! - emp : freshwater budget: volume flux !! - sfx : salt flux !! - fr_i : ice fraction !! - tn_ice : sea-ice surface temperature !! - alb_ice : sea-ice albedo (recomputed only for coupled mode) !! !! References : Goosse, H. et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90. !! Tartinville et al. 2001 Ocean Modelling, 3, 95-108. !! These refs are now obsolete since everything has been revised !! The ref should be Rousset et al., 2015 !!--------------------------------------------------------------------- INTEGER, INTENT(in) :: kt ! number of iteration ! INTEGER :: ji, jj, jl, jk ! dummy loop indices REAL(wp) :: zqmass ! Heat flux associated with mass exchange ice->ocean (W.m-2) REAL(wp) :: zqsr ! New solar flux received by the ocean REAL(wp), DIMENSION(jpi,jpj) :: z2d ! 2D workspace REAL(wp), DIMENSION(jpi,jpj,jpl) :: zalb_cs, zalb_os ! 3D workspace !!--------------------------------------------------------------------- IF( ln_timing ) CALL timing_start('ice_update') IF( kt == nit000 .AND. lwp ) THEN WRITE(numout,*) WRITE(numout,*)'ice_update_flx: update fluxes (mass, salt and heat) at the ice-ocean interface' WRITE(numout,*)'~~~~~~~~~~~~~~' ENDIF ! --- case we bypass ice thermodynamics --- ! IF( .NOT. ln_icethd ) THEN ! we suppose ice is impermeable => ocean is isolated from atmosphere qt_atm_oi (:,:) = ( 1._wp - at_i_b(:,:) ) * ( qns_oce(:,:) + qsr_oce(:,:) ) + qemp_oce(:,:) qt_oce_ai (:,:) = ( 1._wp - at_i_b(:,:) ) * qns_oce(:,:) + qemp_oce(:,:) emp_ice (:,:) = 0._wp qemp_ice (:,:) = 0._wp qevap_ice (:,:,:) = 0._wp ENDIF DO jj = 1, jpj DO ji = 1, jpi ! Solar heat flux reaching the ocean = zqsr (W.m-2) !--------------------------------------------------- zqsr = qsr_tot(ji,jj) - SUM( a_i_b(ji,jj,:) * ( qsr_ice(ji,jj,:) - qtr_ice_bot(ji,jj,:) ) ) ! Total heat flux reaching the ocean = qt_oce_ai (W.m-2) !--------------------------------------------------- zqmass = hfx_thd(ji,jj) + hfx_dyn(ji,jj) + hfx_res(ji,jj) ! heat flux from snow is 0 (T=0 degC) qt_oce_ai(ji,jj) = qt_oce_ai(ji,jj) + zqmass + zqsr ! Add the residual from heat diffusion equation and sublimation (W.m-2) !---------------------------------------------------------------------- qt_oce_ai(ji,jj) = qt_oce_ai(ji,jj) + hfx_err_dif(ji,jj) + & & ( hfx_sub(ji,jj) - SUM( qevap_ice(ji,jj,:) * a_i_b(ji,jj,:) ) ) ! New qsr and qns used to compute the oceanic heat flux at the next time step !---------------------------------------------------------------------------- qsr(ji,jj) = zqsr qns(ji,jj) = qt_oce_ai(ji,jj) - zqsr ! Mass flux at the atm. surface !----------------------------------- wfx_sub(ji,jj) = wfx_snw_sub(ji,jj) + wfx_ice_sub(ji,jj) ! Mass flux at the ocean surface !------------------------------------ ! case of realistic freshwater flux (Tartinville et al., 2001) (presently ACTIVATED) ! ------------------------------------------------------------------------------------- ! The idea of this approach is that the system that we consider is the ICE-OCEAN system ! Thus FW flux = External ( E-P+snow melt) ! Salt flux = Exchanges in the ice-ocean system then converted into FW ! Associated to Ice formation AND Ice melting ! Even if i see Ice melting as a FW and SALT flux ! ! mass flux from ice/ocean wfx_ice(ji,jj) = wfx_bog(ji,jj) + wfx_bom(ji,jj) + wfx_sum(ji,jj) + wfx_sni(ji,jj) & & + wfx_opw(ji,jj) + wfx_dyn(ji,jj) + wfx_res(ji,jj) + wfx_lam(ji,jj) + wfx_pnd(ji,jj) ! add the snow melt water to snow mass flux to the ocean wfx_snw(ji,jj) = wfx_snw_sni(ji,jj) + wfx_snw_dyn(ji,jj) + wfx_snw_sum(ji,jj) ! mass flux at the ocean/ice interface fmmflx(ji,jj) = - ( wfx_ice(ji,jj) + wfx_snw(ji,jj) + wfx_err_sub(ji,jj) ) ! F/M mass flux save at least for biogeochemical model emp(ji,jj) = emp_oce(ji,jj) - wfx_ice(ji,jj) - wfx_snw(ji,jj) - wfx_err_sub(ji,jj) ! mass flux + F/M mass flux (always ice/ocean mass exchange) ! Salt flux at the ocean surface !------------------------------------------ sfx(ji,jj) = sfx_bog(ji,jj) + sfx_bom(ji,jj) + sfx_sum(ji,jj) + sfx_sni(ji,jj) + sfx_opw(ji,jj) & & + sfx_res(ji,jj) + sfx_dyn(ji,jj) + sfx_bri(ji,jj) + sfx_sub(ji,jj) + sfx_lam(ji,jj) ! Mass of snow and ice per unit area !---------------------------------------- snwice_mass_b(ji,jj) = snwice_mass(ji,jj) ! save mass from the previous ice time step ! ! new mass per unit area snwice_mass (ji,jj) = tmask(ji,jj,1) * ( rhosn * vt_s(ji,jj) + rhoic * vt_i(ji,jj) ) ! ! time evolution of snow+ice mass snwice_fmass (ji,jj) = ( snwice_mass(ji,jj) - snwice_mass_b(ji,jj) ) * r1_rdtice END DO END DO ! Storing the transmitted variables !---------------------------------- fr_i (:,:) = at_i(:,:) ! Sea-ice fraction tn_ice(:,:,:) = t_su(:,:,:) ! Ice surface temperature ! Snow/ice albedo (only if sent to coupler, useless in forced mode) !------------------------------------------------------------------ CALL ice_alb( t_su, h_i, h_s, ln_pnd_alb, a_ip_frac, h_ip, zalb_cs, zalb_os ) ! cloud-sky and overcast-sky ice albedos ! alb_ice(:,:,:) = ( 1._wp - cldf_ice ) * zalb_cs(:,:,:) + cldf_ice * zalb_os(:,:,:) ! IF( lrst_ice ) THEN !* write snwice_mass fields in the restart file CALL update_rst( 'WRITE', kt ) ENDIF ! ! output all fluxes !------------------ ! ! --- salt fluxes [kg/m2/s] --- ! ! ! sfxice = sfxbog + sfxbom + sfxsum + sfxsni + sfxopw + sfxres + sfxdyn + sfxbri + sfxsub + sfxlam IF( iom_use('sfxice' ) ) CALL iom_put( "sfxice", sfx * 1.e-03 ) ! salt flux from total ice growth/melt IF( iom_use('sfxbog' ) ) CALL iom_put( "sfxbog", sfx_bog * 1.e-03 ) ! salt flux from bottom growth IF( iom_use('sfxbom' ) ) CALL iom_put( "sfxbom", sfx_bom * 1.e-03 ) ! salt flux from bottom melting IF( iom_use('sfxsum' ) ) CALL iom_put( "sfxsum", sfx_sum * 1.e-03 ) ! salt flux from surface melting IF( iom_use('sfxlam' ) ) CALL iom_put( "sfxlam", sfx_lam * 1.e-03 ) ! salt flux from lateral melting IF( iom_use('sfxsni' ) ) CALL iom_put( "sfxsni", sfx_sni * 1.e-03 ) ! salt flux from snow ice formation IF( iom_use('sfxopw' ) ) CALL iom_put( "sfxopw", sfx_opw * 1.e-03 ) ! salt flux from open water formation IF( iom_use('sfxdyn' ) ) CALL iom_put( "sfxdyn", sfx_dyn * 1.e-03 ) ! salt flux from ridging rafting IF( iom_use('sfxbri' ) ) CALL iom_put( "sfxbri", sfx_bri * 1.e-03 ) ! salt flux from brines IF( iom_use('sfxres' ) ) CALL iom_put( "sfxres", sfx_res * 1.e-03 ) ! salt flux from undiagnosed processes IF( iom_use('sfxsub' ) ) CALL iom_put( "sfxsub", sfx_sub * 1.e-03 ) ! salt flux from sublimation ! --- mass fluxes [kg/m2/s] --- ! IF( iom_use('emp_oce' ) ) CALL iom_put( "emp_oce", emp_oce ) ! emp over ocean (taking into account the snow blown away from the ice) IF( iom_use('emp_ice' ) ) CALL iom_put( "emp_ice", emp_ice ) ! emp over ice (taking into account the snow blown away from the ice) ! ! vfxice = vfxbog + vfxbom + vfxsum + vfxsni + vfxopw + vfxdyn + vfxres + vfxlam + vfxpnd IF( iom_use('vfxice' ) ) CALL iom_put( "vfxice" , wfx_ice ) ! mass flux from total ice growth/melt IF( iom_use('vfxbog' ) ) CALL iom_put( "vfxbog" , wfx_bog ) ! mass flux from bottom growth IF( iom_use('vfxbom' ) ) CALL iom_put( "vfxbom" , wfx_bom ) ! mass flux from bottom melt IF( iom_use('vfxsum' ) ) CALL iom_put( "vfxsum" , wfx_sum ) ! mass flux from surface melt IF( iom_use('vfxlam' ) ) CALL iom_put( "vfxlam" , wfx_lam ) ! mass flux from lateral melt IF( iom_use('vfxsni' ) ) CALL iom_put( "vfxsni" , wfx_sni ) ! mass flux from snow-ice formation IF( iom_use('vfxopw' ) ) CALL iom_put( "vfxopw" , wfx_opw ) ! mass flux from growth in open water IF( iom_use('vfxdyn' ) ) CALL iom_put( "vfxdyn" , wfx_dyn ) ! mass flux from dynamics (ridging) IF( iom_use('vfxres' ) ) CALL iom_put( "vfxres" , wfx_res ) ! mass flux from undiagnosed processes IF( iom_use('vfxpnd' ) ) CALL iom_put( "vfxpnd" , wfx_pnd ) ! mass flux from melt ponds IF( iom_use('vfxsub' ) ) CALL iom_put( "vfxsub" , wfx_ice_sub ) ! mass flux from ice sublimation (ice-atm.) IF( iom_use('vfxsub_err') ) CALL iom_put( "vfxsub_err", wfx_err_sub ) ! "excess" of sublimation sent to ocean IF ( iom_use( "vfxthin" ) ) THEN ! mass flux from ice growth in open water + thin ice (<20cm) => comparable to observations WHERE( hm_i(:,:) < 0.2 .AND. hm_i(:,:) > 0. ) ; z2d = wfx_bog ELSEWHERE ; z2d = 0._wp END WHERE CALL iom_put( "vfxthin", wfx_opw + z2d ) ENDIF ! ! vfxsnw = vfxsnw_sni + vfxsnw_dyn + vfxsnw_sum IF( iom_use('vfxsnw' ) ) CALL iom_put( "vfxsnw" , wfx_snw ) ! mass flux from total snow growth/melt IF( iom_use('vfxsnw_sum' ) ) CALL iom_put( "vfxsnw_sum" , wfx_snw_sum ) ! mass flux from snow melt at the surface IF( iom_use('vfxsnw_sni' ) ) CALL iom_put( "vfxsnw_sni" , wfx_snw_sni ) ! mass flux from snow melt during snow-ice formation IF( iom_use('vfxsnw_dyn' ) ) CALL iom_put( "vfxsnw_dyn" , wfx_snw_dyn ) ! mass flux from dynamics (ridging) IF( iom_use('vfxsnw_sub' ) ) CALL iom_put( "vfxsnw_sub" , wfx_snw_sub ) ! mass flux from snow sublimation (ice-atm.) IF( iom_use('vfxsnw_pre' ) ) CALL iom_put( "vfxsnw_pre" , wfx_spr ) ! snow precip ! --- heat fluxes [W/m2] --- ! ! ! qt_atm_oi - qt_oce_ai = hfxdhc - ( dihctrp + dshctrp ) IF( iom_use('qsr_oce' ) ) CALL iom_put( "qsr_oce" , qsr_oce * ( 1._wp - at_i_b ) ) ! solar flux at ocean surface IF( iom_use('qns_oce' ) ) CALL iom_put( "qns_oce" , qns_oce * ( 1._wp - at_i_b ) + qemp_oce ) ! non-solar flux at ocean surface IF( iom_use('qsr_ice' ) ) CALL iom_put( "qsr_ice" , SUM( qsr_ice * a_i_b, dim=3 ) ) ! solar flux at ice surface IF( iom_use('qns_ice' ) ) CALL iom_put( "qns_ice" , SUM( qns_ice * a_i_b, dim=3 ) + qemp_ice ) ! non-solar flux at ice surface IF( iom_use('qtr_ice_bot') ) CALL iom_put( "qtr_ice_bot", SUM( qtr_ice_bot * a_i_b, dim=3 ) ) ! solar flux transmitted thru ice IF( iom_use('qtr_ice_top') ) CALL iom_put( "qtr_ice_top", SUM( qtr_ice_top * a_i_b, dim=3 ) ) ! solar flux transmitted thru ice surface IF( iom_use('qt_oce' ) ) CALL iom_put( "qt_oce" , ( qsr_oce + qns_oce ) * ( 1._wp - at_i_b ) + qemp_oce ) IF( iom_use('qt_ice' ) ) CALL iom_put( "qt_ice" , SUM( ( qns_ice + qsr_ice ) * a_i_b, dim=3 ) + qemp_ice ) IF( iom_use('qt_oce_ai' ) ) CALL iom_put( "qt_oce_ai" , qt_oce_ai * tmask(:,:,1) ) ! total heat flux at the ocean surface: interface oce-(ice+atm) IF( iom_use('qt_atm_oi' ) ) CALL iom_put( "qt_atm_oi" , qt_atm_oi * tmask(:,:,1) ) ! total heat flux at the oce-ice surface: interface atm-(ice+oce) IF( iom_use('qemp_oce' ) ) CALL iom_put( "qemp_oce" , qemp_oce ) ! Downward Heat Flux from E-P over ocean IF( iom_use('qemp_ice' ) ) CALL iom_put( "qemp_ice" , qemp_ice ) ! Downward Heat Flux from E-P over ice ! heat fluxes from ice transformations ! ! hfxdhc = hfxbog + hfxbom + hfxsum + hfxopw + hfxdif + hfxsnw - ( hfxthd + hfxdyn + hfxres + hfxsub + hfxspr ) IF( iom_use('hfxbog' ) ) CALL iom_put ("hfxbog" , hfx_bog ) ! heat flux used for ice bottom growth IF( iom_use('hfxbom' ) ) CALL iom_put ("hfxbom" , hfx_bom ) ! heat flux used for ice bottom melt IF( iom_use('hfxsum' ) ) CALL iom_put ("hfxsum" , hfx_sum ) ! heat flux used for ice surface melt IF( iom_use('hfxopw' ) ) CALL iom_put ("hfxopw" , hfx_opw ) ! heat flux used for ice formation in open water IF( iom_use('hfxdif' ) ) CALL iom_put ("hfxdif" , hfx_dif ) ! heat flux used for ice temperature change IF( iom_use('hfxsnw' ) ) CALL iom_put ("hfxsnw" , hfx_snw ) ! heat flux used for snow melt IF( iom_use('hfxerr' ) ) CALL iom_put ("hfxerr" , hfx_err_dif ) ! heat flux error after heat diffusion (included in qt_oce_ai) ! heat fluxes associated with mass exchange (freeze/melt/precip...) IF( iom_use('hfxthd' ) ) CALL iom_put ("hfxthd" , hfx_thd ) ! IF( iom_use('hfxdyn' ) ) CALL iom_put ("hfxdyn" , hfx_dyn ) ! IF( iom_use('hfxres' ) ) CALL iom_put ("hfxres" , hfx_res ) ! IF( iom_use('hfxsub' ) ) CALL iom_put ("hfxsub" , hfx_sub ) ! IF( iom_use('hfxspr' ) ) CALL iom_put ("hfxspr" , hfx_spr ) ! Heat flux from snow precip heat content ! other heat fluxes IF( iom_use('hfxsensib' ) ) CALL iom_put( "hfxsensib" , -qsb_ice_bot * at_i_b ) ! Sensible oceanic heat flux IF( iom_use('hfxcndbot' ) ) CALL iom_put( "hfxcndbot" , SUM( qcn_ice_bot * a_i_b, dim=3 ) ) ! Bottom conduction flux IF( iom_use('hfxcndtop' ) ) CALL iom_put( "hfxcndtop" , SUM( qcn_ice_top * a_i_b, dim=3 ) ) ! Surface conduction flux ! diags IF( iom_use('hfxdhc' ) ) CALL iom_put ("hfxdhc" , diag_heat ) ! Heat content variation in snow and ice ! ! controls !--------- #if ! defined key_agrif IF( ln_icediachk .AND. .NOT. ln_bdy) CALL ice_cons_final('iceupdate') ! conservation #endif IF( ln_icectl ) CALL ice_prt (kt, iiceprt, jiceprt, 3, 'Final state ice_update') ! prints IF( ln_ctl ) CALL ice_prt3D ('iceupdate') ! prints IF( ln_timing ) CALL timing_stop ('ice_update') ! timing ! END SUBROUTINE ice_update_flx SUBROUTINE ice_update_tau( kt, pu_oce, pv_oce ) !!------------------------------------------------------------------- !! *** ROUTINE ice_update_tau *** !! !! ** Purpose : Update the ocean surface stresses due to the ice !! !! ** Action : * at each ice time step (every nn_fsbc time step): !! - compute the modulus of ice-ocean relative velocity !! (*rho*Cd) at T-point (C-grid) or I-point (B-grid) !! tmod_io = rhoco * | U_ice-U_oce | !! - update the modulus of stress at ocean surface !! taum = (1-a) * taum + a * tmod_io * | U_ice-U_oce | !! * at each ocean time step (every kt): !! compute linearized ice-ocean stresses as !! Utau = tmod_io * | U_ice - pU_oce | !! using instantaneous current ocean velocity (usually before) !! !! NB: - ice-ocean rotation angle no more allowed !! - here we make an approximation: taum is only computed every ice time step !! This avoids mutiple average to pass from T -> U,V grids and next from U,V grids !! to T grid. taum is used in TKE and GLS, which should not be too sensitive to this approximaton... !! !! ** Outputs : - utau, vtau : surface ocean i- and j-stress (u- & v-pts) updated with ice-ocean fluxes !! - taum : modulus of the surface ocean stress (T-point) updated with ice-ocean fluxes !!--------------------------------------------------------------------- INTEGER , INTENT(in) :: kt ! ocean time-step index REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pu_oce, pv_oce ! surface ocean currents ! INTEGER :: ji, jj ! dummy loop indices REAL(wp) :: zat_u, zutau_ice, zu_t, zmodt ! local scalar REAL(wp) :: zat_v, zvtau_ice, zv_t, zrhoco ! - - !!--------------------------------------------------------------------- IF( ln_timing ) CALL timing_start('ice_update_tau') IF( kt == nit000 .AND. lwp ) THEN WRITE(numout,*) WRITE(numout,*)'ice_update_tau: update stress at the ice-ocean interface' WRITE(numout,*)'~~~~~~~~~~~~~~' ENDIF zrhoco = rau0 * rn_cio ! IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN !== Ice time-step only ==! (i.e. surface module time-step) DO jj = 2, jpjm1 !* update the modulus of stress at ocean surface (T-point) DO ji = fs_2, fs_jpim1 ! ! 2*(U_ice-U_oce) at T-point zu_t = u_ice(ji,jj) + u_ice(ji-1,jj) - u_oce(ji,jj) - u_oce(ji-1,jj) zv_t = v_ice(ji,jj) + v_ice(ji,jj-1) - v_oce(ji,jj) - v_oce(ji,jj-1) ! ! |U_ice-U_oce|^2 zmodt = 0.25_wp * ( zu_t * zu_t + zv_t * zv_t ) ! ! update the ocean stress modulus taum(ji,jj) = ( 1._wp - at_i(ji,jj) ) * taum(ji,jj) + at_i(ji,jj) * zrhoco * zmodt tmod_io(ji,jj) = zrhoco * SQRT( zmodt ) ! rhoco * |U_ice-U_oce| at T-point END DO END DO CALL lbc_lnk_multi( taum, 'T', 1., tmod_io, 'T', 1. ) ! utau_oce(:,:) = utau(:,:) !* save the air-ocean stresses at ice time-step vtau_oce(:,:) = vtau(:,:) ! ENDIF ! ! !== every ocean time-step ==! ! DO jj = 2, jpjm1 !* update the stress WITHOUT an ice-ocean rotation angle DO ji = fs_2, fs_jpim1 ! Vect. Opt. ! ice area at u and v-points zat_u = ( at_i(ji,jj) * tmask(ji,jj,1) + at_i (ji+1,jj ) * tmask(ji+1,jj ,1) ) & & / MAX( 1.0_wp , tmask(ji,jj,1) + tmask(ji+1,jj ,1) ) zat_v = ( at_i(ji,jj) * tmask(ji,jj,1) + at_i (ji ,jj+1 ) * tmask(ji ,jj+1,1) ) & & / MAX( 1.0_wp , tmask(ji,jj,1) + tmask(ji ,jj+1,1) ) ! ! linearized quadratic drag formulation zutau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji+1,jj) ) * ( u_ice(ji,jj) - pu_oce(ji,jj) ) zvtau_ice = 0.5_wp * ( tmod_io(ji,jj) + tmod_io(ji,jj+1) ) * ( v_ice(ji,jj) - pv_oce(ji,jj) ) ! ! stresses at the ocean surface utau(ji,jj) = ( 1._wp - zat_u ) * utau_oce(ji,jj) + zat_u * zutau_ice vtau(ji,jj) = ( 1._wp - zat_v ) * vtau_oce(ji,jj) + zat_v * zvtau_ice END DO END DO CALL lbc_lnk_multi( utau, 'U', -1., vtau, 'V', -1. ) ! lateral boundary condition ! IF( ln_timing ) CALL timing_stop('ice_update_tau') ! END SUBROUTINE ice_update_tau SUBROUTINE ice_update_init !!------------------------------------------------------------------- !! *** ROUTINE ice_update_init *** !! !! ** Purpose : allocate ice-ocean stress fields and read restarts !! containing the snow & ice mass !! !!------------------------------------------------------------------- INTEGER :: ji, jj, jk ! dummy loop indices REAL(wp) :: zcoefu, zcoefv, zcoeff ! local scalar !!------------------------------------------------------------------- ! IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'ice_update_init: ice-ocean stress init' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~~~~' ! ! ! allocate ice_update array IF( ice_update_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'ice_update_init : unable to allocate standard arrays' ) ! CALL update_rst( 'READ' ) !* read or initialize all required files ! END SUBROUTINE ice_update_init SUBROUTINE update_rst( cdrw, kt ) !!--------------------------------------------------------------------- !! *** ROUTINE rhg_evp_rst *** !! !! ** Purpose : Read or write RHG file in restart file !! !! ** Method : use of IOM library !!---------------------------------------------------------------------- CHARACTER(len=*) , INTENT(in) :: cdrw ! "READ"/"WRITE" flag INTEGER, OPTIONAL, INTENT(in) :: kt ! ice time-step ! INTEGER :: iter ! local integer INTEGER :: id1 ! local integer !!---------------------------------------------------------------------- ! IF( TRIM(cdrw) == 'READ' ) THEN ! Read/initialize ! ! --------------- IF( ln_rstart ) THEN !* Read the restart file ! id1 = iom_varid( numrir, 'snwice_mass' , ldstop = .FALSE. ) ! IF( id1 > 0 ) THEN ! fields exist CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass' , snwice_mass ) CALL iom_get( numrir, jpdom_autoglo, 'snwice_mass_b', snwice_mass_b ) ELSE ! start from rest IF(lwp) WRITE(numout,*) ' ==>> previous run without snow-ice mass output then set it' snwice_mass (:,:) = tmask(:,:,1) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) snwice_mass_b(:,:) = snwice_mass(:,:) ENDIF ELSE !* Start from rest IF(lwp) WRITE(numout,*) ' ==>> start from rest: set the snow-ice mass' snwice_mass (:,:) = tmask(:,:,1) * ( rhosn * vt_s(:,:) + rhoic * vt_i(:,:) ) snwice_mass_b(:,:) = snwice_mass(:,:) ENDIF ! ELSEIF( TRIM(cdrw) == 'WRITE' ) THEN ! Create restart file ! ! ------------------- IF(lwp) WRITE(numout,*) '---- update-rst ----' iter = kt + nn_fsbc - 1 ! ice restarts are written at kt == nitrst - nn_fsbc + 1 ! CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass' , snwice_mass ) CALL iom_rstput( iter, nitrst, numriw, 'snwice_mass_b', snwice_mass_b ) ! ENDIF ! END SUBROUTINE update_rst #else !!---------------------------------------------------------------------- !! Default option Dummy module NO SI3 sea-ice model !!---------------------------------------------------------------------- #endif !!====================================================================== END MODULE iceupdate