MODULE bdyice !!====================================================================== !! *** MODULE bdyice *** !! Unstructured Open Boundary Cond. : Open boundary conditions for sea-ice (LIM3) !!====================================================================== !! History : 3.3 ! 2010-09 (D. Storkey) Original code !! 3.4 ! 2011 (D. Storkey) rewrite in preparation for OBC-BDY merge !! - ! 2012-01 (C. Rousset) add lim3 and remove useless jk loop !!---------------------------------------------------------------------- #if defined key_lim3 !!---------------------------------------------------------------------- !! 'key_lim3' LIM-3 sea ice model !!---------------------------------------------------------------------- !! bdy_ice : Application of open boundaries to ice !! bdy_ice_frs : Application of Flow Relaxation Scheme !!---------------------------------------------------------------------- USE timing ! Timing USE phycst ! physical constant USE eosbn2 ! equation of state USE oce ! ocean dynamics and tracers variables USE ice ! LIM_3 ice variables USE limvar USE icectl USE par_oce ! ocean parameters USE dom_oce ! ocean space and time domain variables USE sbc_oce ! Surface boundary condition: ocean fields USE bdy_oce ! ocean open boundary conditions USE lbclnk ! ocean lateral boundary conditions (or mpp link) USE in_out_manager ! write to numout file USE lib_mpp ! distributed memory computing USE lib_fortran ! to use key_nosignedzero IMPLICIT NONE PRIVATE PUBLIC bdy_ice ! routine called in sbcmod PUBLIC bdy_ice_dyn ! routine called in limrhg !!---------------------------------------------------------------------- !! NEMO/OPA 3.3 , NEMO Consortium (2010) !! $Id: bdyice.F90 8306 2017-07-10 10:18:03Z clem $ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE bdy_ice( kt ) !!---------------------------------------------------------------------- !! *** SUBROUTINE bdy_ice *** !! !! ** Purpose : - Apply open boundary conditions for ice (LIM3) !! !!---------------------------------------------------------------------- INTEGER, INTENT( in ) :: kt ! Main time step counter ! INTEGER :: ib_bdy ! Loop index !!---------------------------------------------------------------------- ! CALL lim_var_glo2eqv ! DO ib_bdy=1, nb_bdy ! SELECT CASE( cn_ice_lim(ib_bdy) ) CASE('none') CYCLE CASE('frs') CALL bdy_ice_frs( idx_bdy(ib_bdy), dta_bdy(ib_bdy), kt, ib_bdy ) CASE DEFAULT CALL ctl_stop( 'bdy_ice : unrecognised option for open boundaries for ice fields' ) END SELECT ! END DO ! CALL lim_var_zapsmall CALL lim_var_agg(1) IF( ln_limctl ) CALL ice_prt( kt, iiceprt, jiceprt, 1, ' - ice thermo bdy - ' ) ! END SUBROUTINE bdy_ice SUBROUTINE bdy_ice_frs( idx, dta, kt, ib_bdy ) !!------------------------------------------------------------------------------ !! *** SUBROUTINE bdy_ice_frs *** !! !! ** Purpose : Apply the Flow Relaxation Scheme for sea-ice fields in the case !! of unstructured open boundaries. !! !! Reference : Engedahl H., 1995: Use of the flow relaxation scheme in a three- !! dimensional baroclinic ocean model with realistic topography. Tellus, 365-382. !!------------------------------------------------------------------------------ TYPE(OBC_INDEX), INTENT(in) :: idx ! OBC indices TYPE(OBC_DATA), INTENT(in) :: dta ! OBC external data INTEGER, INTENT(in) :: kt ! main time-step counter INTEGER, INTENT(in) :: ib_bdy ! BDY set index ! INTEGER :: jpbound ! 0 = incoming ice ! ! 1 = outgoing ice INTEGER :: jb, jk, jgrd, jl ! dummy loop indices INTEGER :: ji, jj, ii, ij ! local scalar REAL(wp) :: zwgt, zwgt1 ! local scalar REAL(wp) :: ztmelts, zdh !!------------------------------------------------------------------------------ ! IF( nn_timing == 1 ) CALL timing_start('bdy_ice_frs') ! jgrd = 1 ! Everything is at T-points here ! DO jl = 1, jpl DO jb = 1, idx%nblenrim(jgrd) ji = idx%nbi(jb,jgrd) jj = idx%nbj(jb,jgrd) zwgt = idx%nbw(jb,jgrd) zwgt1 = 1.e0 - idx%nbw(jb,jgrd) a_i (ji,jj,jl) = ( a_i (ji,jj,jl) * zwgt1 + dta%a_i (jb,jl) * zwgt ) * tmask(ji,jj,1) ! Leads fraction ht_i(ji,jj,jl) = ( ht_i(ji,jj,jl) * zwgt1 + dta%ht_i(jb,jl) * zwgt ) * tmask(ji,jj,1) ! Ice depth ht_s(ji,jj,jl) = ( ht_s(ji,jj,jl) * zwgt1 + dta%ht_s(jb,jl) * zwgt ) * tmask(ji,jj,1) ! Snow depth ! ----------------- ! Pathological case ! ----------------- ! In case a) snow load would be in excess or b) ice is coming into a warmer environment that would lead to ! very large transformation from snow to ice (see limthd_dh.F90) ! Then, a) 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 ) ! Or, b) transfer all the snow into ice (if incoming ice is likely to melt as it comes into a warmer environment) !zdh = MAX( 0._wp, ht_s(ji,jj,jl) * rhosn / rhoic ) ! recompute ht_i, ht_s 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 / rhosn ) ENDDO CALL lbc_bdy_lnk( a_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( ht_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( ht_s(:,:,jl), 'T', 1., ib_bdy ) ENDDO ! retrieve at_i at_i(:,:) = 0._wp DO jl = 1, jpl at_i(:,:) = a_i(:,:,jl) + at_i(:,:) END DO DO jl = 1, jpl DO jb = 1, idx%nblenrim(jgrd) ji = idx%nbi(jb,jgrd) jj = idx%nbj(jb,jgrd) ! condition on ice thickness depends on the ice velocity ! if velocity is outward (strictly), then ice thickness, volume... must be equal to adjacent values jpbound = 0 ; ii = ji ; ij = jj ! IF( u_ice(ji+1,jj ) < 0. .AND. umask(ji-1,jj ,1) == 0. ) jpbound = 1; ii = ji+1; ij = jj IF( u_ice(ji-1,jj ) > 0. .AND. umask(ji+1,jj ,1) == 0. ) jpbound = 1; ii = ji-1; ij = jj IF( v_ice(ji ,jj+1) < 0. .AND. vmask(ji ,jj-1,1) == 0. ) jpbound = 1; ii = ji ; ij = jj+1 IF( v_ice(ji ,jj-1) > 0. .AND. vmask(ji ,jj+1,1) == 0. ) jpbound = 1; ii = ji ; ij = jj-1 ! IF( nn_ice_lim_dta(ib_bdy) == 0 ) jpbound = 0; ii = ji; ij = jj ! case ice boundaries = initial conditions ! ! do not make state variables dependent on velocity ! rswitch = MAX( 0.0_wp , SIGN ( 1.0_wp , at_i(ii,ij) - 0.01 ) ) ! 0 if no ice ! ! concentration and thickness a_i (ji,jj,jl) = a_i (ii,ij,jl) * rswitch ht_i(ji,jj,jl) = ht_i(ii,ij,jl) * rswitch ht_s(ji,jj,jl) = ht_s(ii,ij,jl) * rswitch ! ! Ice and snow volumes v_i(ji,jj,jl) = ht_i(ji,jj,jl) * a_i(ji,jj,jl) v_s(ji,jj,jl) = ht_s(ji,jj,jl) * a_i(ji,jj,jl) ! SELECT CASE( jpbound ) ! CASE( 0 ) ! velocity is inward ! ! Ice salinity, age, temperature sm_i(ji,jj,jl) = rswitch * rn_ice_sal(ib_bdy) + ( 1.0 - rswitch ) * rn_simin oa_i(ji,jj,jl) = rswitch * rn_ice_age(ib_bdy) * a_i(ji,jj,jl) t_su(ji,jj,jl) = rswitch * rn_ice_tem(ib_bdy) + ( 1.0 - rswitch ) * rn_ice_tem(ib_bdy) DO jk = 1, nlay_s t_s(ji,jj,jk,jl) = rswitch * rn_ice_tem(ib_bdy) + ( 1.0 - rswitch ) * rt0 END DO DO jk = 1, nlay_i t_i(ji,jj,jk,jl) = rswitch * rn_ice_tem(ib_bdy) + ( 1.0 - rswitch ) * rt0 s_i(ji,jj,jk,jl) = rswitch * rn_ice_sal(ib_bdy) + ( 1.0 - rswitch ) * rn_simin END DO ! CASE( 1 ) ! velocity is outward ! ! Ice salinity, age, temperature sm_i(ji,jj,jl) = rswitch * sm_i(ii,ij,jl) + ( 1.0 - rswitch ) * rn_simin oa_i(ji,jj,jl) = rswitch * oa_i(ii,ij,jl) t_su(ji,jj,jl) = rswitch * t_su(ii,ij,jl) + ( 1.0 - rswitch ) * rt0 DO jk = 1, nlay_s t_s(ji,jj,jk,jl) = rswitch * t_s(ii,ij,jk,jl) + ( 1.0 - rswitch ) * rt0 END DO DO jk = 1, nlay_i t_i(ji,jj,jk,jl) = rswitch * t_i(ii,ij,jk,jl) + ( 1.0 - rswitch ) * rt0 s_i(ji,jj,jk,jl) = rswitch * s_i(ii,ij,jk,jl) + ( 1.0 - rswitch ) * rn_simin END DO ! END SELECT ! IF( nn_icesal == 1 ) THEN ! constant salinity : overwrite rn_icesal sm_i(ji,jj ,jl) = rn_icesal s_i (ji,jj,:,jl) = rn_icesal ENDIF ! ! contents smv_i(ji,jj,jl) = MIN( sm_i(ji,jj,jl) , sss_m(ji,jj) ) * v_i(ji,jj,jl) DO jk = 1, nlay_s ! Snow energy of melting e_s(ji,jj,jk,jl) = rswitch * rhosn * ( cpic * ( rt0 - t_s(ji,jj,jk,jl) ) + lfus ) ! Multiply by volume, so that 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 DO jk = 1, nlay_i ztmelts = - tmut * s_i(ji,jj,jk,jl) + rt0 !Melting temperature in K ! heat content per unit volume e_i(ji,jj,jk,jl) = rswitch * rhoic * & ( cpic * ( ztmelts - t_i(ji,jj,jk,jl) ) & + lfus * ( 1.0 - (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) * a_i(ji,jj,jl) * ht_i(ji,jj,jl) * r1_nlay_i END DO ! END DO ! CALL lbc_bdy_lnk( a_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( ht_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( ht_s(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( v_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( v_s(:,:,jl), 'T', 1., ib_bdy ) ! CALL lbc_bdy_lnk( smv_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( sm_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( oa_i(:,:,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk( t_su(:,:,jl), 'T', 1., ib_bdy ) DO jk = 1, nlay_s CALL lbc_bdy_lnk(t_s(:,:,jk,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk(e_s(:,:,jk,jl), 'T', 1., ib_bdy ) END DO DO jk = 1, nlay_i CALL lbc_bdy_lnk(t_i(:,:,jk,jl), 'T', 1., ib_bdy ) CALL lbc_bdy_lnk(e_i(:,:,jk,jl), 'T', 1., ib_bdy ) END DO ! END DO !jl ! ! IF( nn_timing == 1 ) CALL timing_stop('bdy_ice_frs') ! END SUBROUTINE bdy_ice_frs SUBROUTINE bdy_ice_dyn( cd_type ) !!------------------------------------------------------------------------------ !! *** SUBROUTINE bdy_ice_dyn *** !! !! ** Purpose : Apply dynamics boundary conditions for sea-ice in the cas of unstructured open boundaries. !! u_ice and v_ice are equal to the value of the adjacent grid point if this latter is not ice free !! if adjacent grid point is ice free, then u_ice and v_ice are equal to ocean velocities !! !! 2013-06 : C. Rousset !!------------------------------------------------------------------------------ CHARACTER(len=1), INTENT(in) :: cd_type ! nature of velocity grid-points ! INTEGER :: jb, jgrd ! dummy loop indices INTEGER :: ji, jj ! local scalar INTEGER :: ib_bdy ! Loop index REAL(wp) :: zmsk1, zmsk2, zflag !!------------------------------------------------------------------------------ ! IF( nn_timing == 1 ) CALL timing_start('bdy_ice_dyn') ! DO ib_bdy=1, nb_bdy ! SELECT CASE( cn_ice_lim(ib_bdy) ) ! CASE('none') CYCLE ! CASE('frs') ! IF( nn_ice_lim_dta(ib_bdy) == 0 ) CYCLE ! case ice boundaries = initial conditions ! ! do not change ice velocity (it is only computed by rheology) SELECT CASE ( cd_type ) ! CASE ( 'U' ) jgrd = 2 ! u velocity DO jb = 1, idx_bdy(ib_bdy)%nblenrim(jgrd) ji = idx_bdy(ib_bdy)%nbi(jb,jgrd) jj = idx_bdy(ib_bdy)%nbj(jb,jgrd) zflag = idx_bdy(ib_bdy)%flagu(jb,jgrd) ! IF ( ABS( zflag ) == 1. ) THEN ! eastern and western boundaries ! one of the two zmsk is always 0 (because of zflag) zmsk1 = 1._wp - MAX( 0.0_wp, SIGN ( 1.0_wp , - vt_i(ji+1,jj) ) ) ! 0 if no ice zmsk2 = 1._wp - MAX( 0.0_wp, SIGN ( 1.0_wp , - vt_i(ji-1,jj) ) ) ! 0 if no ice ! ! u_ice = u_ice of the adjacent grid point except if this grid point is ice-free (then u_ice = u_oce) u_ice (ji,jj) = u_ice(ji+1,jj) * 0.5_wp * ABS( zflag + 1._wp ) * zmsk1 + & & u_ice(ji-1,jj) * 0.5_wp * ABS( zflag - 1._wp ) * zmsk2 + & & u_oce(ji ,jj) * ( 1._wp - MIN( 1._wp, zmsk1 + zmsk2 ) ) ELSE ! everywhere else !u_ice(ji,jj) = u_oce(ji,jj) u_ice(ji,jj) = 0._wp ENDIF ! mask ice velocities rswitch = MAX( 0.0_wp , SIGN ( 1.0_wp , at_i(ji,jj) - 0.01_wp ) ) ! 0 if no ice u_ice(ji,jj) = rswitch * u_ice(ji,jj) ! END DO CALL lbc_bdy_lnk( u_ice(:,:), 'U', -1., ib_bdy ) ! CASE ( 'V' ) jgrd = 3 ! v velocity DO jb = 1, idx_bdy(ib_bdy)%nblenrim(jgrd) ji = idx_bdy(ib_bdy)%nbi(jb,jgrd) jj = idx_bdy(ib_bdy)%nbj(jb,jgrd) zflag = idx_bdy(ib_bdy)%flagv(jb,jgrd) ! IF ( ABS( zflag ) == 1. ) THEN ! northern and southern boundaries ! one of the two zmsk is always 0 (because of zflag) zmsk1 = 1._wp - MAX( 0.0_wp, SIGN ( 1.0_wp , - vt_i(ji,jj+1) ) ) ! 0 if no ice zmsk2 = 1._wp - MAX( 0.0_wp, SIGN ( 1.0_wp , - vt_i(ji,jj-1) ) ) ! 0 if no ice ! ! u_ice = u_ice of the adjacent grid point except if this grid point is ice-free (then u_ice = u_oce) v_ice (ji,jj) = v_ice(ji,jj+1) * 0.5_wp * ABS( zflag + 1._wp ) * zmsk1 + & & v_ice(ji,jj-1) * 0.5_wp * ABS( zflag - 1._wp ) * zmsk2 + & & v_oce(ji,jj ) * ( 1._wp - MIN( 1._wp, zmsk1 + zmsk2 ) ) ELSE ! everywhere else !v_ice(ji,jj) = v_oce(ji,jj) v_ice(ji,jj) = 0._wp ENDIF ! mask ice velocities rswitch = MAX( 0.0_wp , SIGN ( 1.0_wp , at_i(ji,jj) - 0.01 ) ) ! 0 if no ice v_ice(ji,jj) = rswitch * v_ice(ji,jj) ! END DO CALL lbc_bdy_lnk( v_ice(:,:), 'V', -1., ib_bdy ) ! END SELECT ! CASE DEFAULT CALL ctl_stop( 'bdy_ice_dyn : unrecognised option for open boundaries for ice fields' ) END SELECT ! END DO ! IF( nn_timing == 1 ) CALL timing_stop('bdy_ice_dyn') ! END SUBROUTINE bdy_ice_dyn #else !!--------------------------------------------------------------------------------- !! Default option Empty module !!--------------------------------------------------------------------------------- CONTAINS SUBROUTINE bdy_ice( kt ) ! Empty routine WRITE(*,*) 'bdy_ice: You should not have seen this print! error?', kt END SUBROUTINE bdy_ice #endif !!================================================================================= END MODULE bdyice