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iceitd.F90 38.05 KiB
MODULE iceitd
!!======================================================================
!! *** MODULE iceitd ***
!! sea-ice : ice thickness distribution
!!======================================================================
!! History : 3.0 ! 2005-12 (M. Vancoppenolle) original code (based on CICE)
!! 4.0 ! 2018 (many people) SI3 [aka Sea Ice cube]
!!----------------------------------------------------------------------
#if defined key_si3
!!----------------------------------------------------------------------
!! 'key_si3' SI3 sea-ice model
!!----------------------------------------------------------------------
!! ice_itd_rem : redistribute ice thicknesses after thermo growth and melt
!! itd_glinear : build g(h) satisfying area and volume constraints
!! itd_shiftice : shift ice across category boundaries, conserving everything
!! ice_itd_reb : rebin ice thicknesses into bounded categories
!! ice_itd_init : read ice thicknesses mean and min from namelist
!!----------------------------------------------------------------------
USE dom_oce ! ocean domain
USE phycst ! physical constants
USE ice1D ! sea-ice: thermodynamic variables
USE ice ! sea-ice: variables
USE icevar ! sea-ice: operations
USE icectl ! sea-ice: conservation tests
USE icetab ! sea-ice: convert 1D<=>2D
!
USE in_out_manager ! I/O manager
USE lib_mpp ! MPP library
USE lib_fortran ! fortran utilities (glob_sum + no signed zero)
USE prtctl ! Print control
USE timing ! Timing
IMPLICIT NONE
PRIVATE
PUBLIC ice_itd_init ! called in icestp
PUBLIC ice_itd_rem ! called in icethd
PUBLIC ice_itd_reb ! called in icecor
INTEGER :: nice_catbnd ! choice of the type of ice category function
! ! associated indices:
INTEGER, PARAMETER :: np_cathfn = 1 ! categories defined by a function
INTEGER, PARAMETER :: np_catusr = 2 ! categories defined by the user
!
! !! ** namelist (namitd) **
LOGICAL :: ln_cat_hfn ! ice categories are defined by function like rn_himean**(-0.05)
REAL(wp) :: rn_himean ! mean thickness of the domain
LOGICAL :: ln_cat_usr ! ice categories are defined by rn_catbnd
REAL(wp), DIMENSION(0:100) :: rn_catbnd ! ice categories bounds
REAL(wp) :: rn_himax ! maximum ice thickness allowed
!
!! * Substitutions
# include "do_loop_substitute.h90"
!!----------------------------------------------------------------------
!! NEMO/ICE 4.0 , NEMO Consortium (2018)
!! $Id: iceitd.F90 15046 2021-06-23 10:46:01Z clem $
!! Software governed by the CeCILL license (see ./LICENSE)
!!----------------------------------------------------------------------
CONTAINS
SUBROUTINE ice_itd_rem( kt )
!!------------------------------------------------------------------
!! *** ROUTINE ice_itd_rem ***
!!
!! ** Purpose : computes the redistribution of ice thickness
!! after thermodynamic growth of ice thickness
!!
!! ** Method : Linear remapping
!!
!! References : W.H. Lipscomb, JGR 2001 !!------------------------------------------------------------------
INTEGER , INTENT (in) :: kt ! Ocean time step
!
INTEGER :: ji, jj, jl, jcat ! dummy loop index
INTEGER :: ipti ! local integer
REAL(wp) :: zx1, zwk1, zdh0, zetamin, zdamax ! local scalars
REAL(wp) :: zx2, zwk2, zda0, zetamax ! - -
REAL(wp) :: zx3
REAL(wp) :: zslope ! used to compute local thermodynamic "speeds"
!
INTEGER , DIMENSION(jpij) :: iptidx ! compute remapping or not
INTEGER , DIMENSION(jpij,jpl-1) :: jdonor ! donor category index
REAL(wp), DIMENSION(jpij,jpl) :: zdhice ! ice thickness increment
REAL(wp), DIMENSION(jpij,jpl) :: g0, g1 ! coefficients for fitting the line of the ITD
REAL(wp), DIMENSION(jpij,jpl) :: hL, hR ! left and right boundary for the ITD for each thickness
REAL(wp), DIMENSION(jpij,jpl-1) :: zdaice, zdvice ! local increment of ice area and volume
REAL(wp), DIMENSION(jpij) :: zhb0, zhb1 ! category boundaries for thinnes categories
REAL(wp), DIMENSION(jpij,0:jpl) :: zhbnew ! new boundaries of ice categories
!!------------------------------------------------------------------
IF( ln_timing ) CALL timing_start('iceitd_rem')
IF( kt == nit000 .AND. lwp ) WRITE(numout,*) '-- ice_itd_rem: remapping ice thickness distribution'
IF( ln_icediachk ) CALL ice_cons_hsm(0, 'iceitd_rem', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft)
IF( ln_icediachk ) CALL ice_cons2D (0, 'iceitd_rem', diag_v, diag_s, diag_t, diag_fv, diag_fs, diag_ft)
!-----------------------------------------------------------------------------------------------
! 1) Identify grid cells with ice
!-----------------------------------------------------------------------------------------------
at_i(:,:) = SUM( a_i, dim=3 )
!
npti = 0 ; nptidx(:) = 0
DO_2D( nn_hls, nn_hls, nn_hls, nn_hls )
IF ( at_i(ji,jj) > epsi10 ) THEN
npti = npti + 1
nptidx( npti ) = (jj - 1) * jpi + ji
ENDIF
END_2D
!-----------------------------------------------------------------------------------------------
! 2) Compute new category boundaries
!-----------------------------------------------------------------------------------------------
IF( npti > 0 ) THEN
!
zdhice(:,:) = 0._wp
zhbnew(:,:) = 0._wp
!
CALL tab_3d_2d( npti, nptidx(1:npti), h_i_2d (1:npti,1:jpl), h_i )
CALL tab_3d_2d( npti, nptidx(1:npti), h_ib_2d(1:npti,1:jpl), h_i_b )
CALL tab_3d_2d( npti, nptidx(1:npti), a_i_2d (1:npti,1:jpl), a_i )
CALL tab_3d_2d( npti, nptidx(1:npti), a_ib_2d(1:npti,1:jpl), a_i_b )
!
DO jl = 1, jpl
! Compute thickness change in each ice category
DO ji = 1, npti
IF( a_i_2d(ji,jl) > epsi10 ) zdhice(ji,jl) = h_i_2d(ji,jl) - h_ib_2d(ji,jl)
END DO
END DO
!
! --- New boundaries for category 1:jpl-1 --- !
DO jl = 1, jpl - 1
!
DO ji = 1, npti
!
! --- New boundary: Hn* = Hn + Fn*dt --- !
! Fn*dt = ( fn + (fn+1 - fn)/(hn+1 - hn) * (Hn - hn) ) * dt = zdhice + zslope * (Hmax - h_i_b)
!
IF ( a_ib_2d(ji,jl) > epsi10 .AND. a_ib_2d(ji,jl+1) > epsi10 ) THEN ! a(jl+1) & a(jl) /= 0
zslope = ( zdhice(ji,jl+1) - zdhice(ji,jl) ) / ( h_ib_2d(ji,jl+1) - h_ib_2d(ji,jl) )
zhbnew(ji,jl) = hi_max(jl) + zdhice(ji,jl) + zslope * ( hi_max(jl) - h_ib_2d(ji,jl) ) ELSEIF( a_ib_2d(ji,jl) > epsi10 .AND. a_ib_2d(ji,jl+1) <= epsi10 ) THEN ! a(jl+1)=0 => Hn* = Hn + fn*dt
zhbnew(ji,jl) = hi_max(jl) + zdhice(ji,jl)
ELSEIF( a_ib_2d(ji,jl) <= epsi10 .AND. a_ib_2d(ji,jl+1) > epsi10 ) THEN ! a(jl)=0 => Hn* = Hn + fn+1*dt
zhbnew(ji,jl) = hi_max(jl) + zdhice(ji,jl+1)
ELSE ! a(jl+1) & a(jl) = 0
zhbnew(ji,jl) = hi_max(jl)
ENDIF
!
! --- 2 conditions for remapping --- !
! 1) hn(t+1)+espi < Hn* < hn+1(t+1)-epsi
! Note: hn(t+1) must not be too close to either HR or HL otherwise a division by nearly 0 is possible
! in itd_glinear in the case (HR-HL) = 3(Hice - HL) or = 3(HR - Hice)
# if defined key_single
IF( a_i_2d(ji,jl ) > epsi10 .AND. h_i_2d(ji,jl ) > ( zhbnew(ji,jl) - epsi06 ) ) nptidx(ji) = 0
IF( a_i_2d(ji,jl+1) > epsi10 .AND. h_i_2d(ji,jl+1) < ( zhbnew(ji,jl) + epsi06 ) ) nptidx(ji) = 0
# else
IF( a_i_2d(ji,jl ) > epsi10 .AND. h_i_2d(ji,jl ) > ( zhbnew(ji,jl) - epsi10 ) ) nptidx(ji) = 0
IF( a_i_2d(ji,jl+1) > epsi10 .AND. h_i_2d(ji,jl+1) < ( zhbnew(ji,jl) + epsi10 ) ) nptidx(ji) = 0
# endif
!
! 2) Hn-1 < Hn* < Hn+1
IF( zhbnew(ji,jl) < hi_max(jl-1) ) nptidx(ji) = 0
IF( zhbnew(ji,jl) > hi_max(jl+1) ) nptidx(ji) = 0
!
END DO
END DO
!
! --- New boundaries for category jpl --- !
DO ji = 1, npti
IF( a_i_2d(ji,jpl) > epsi10 ) THEN
zhbnew(ji,jpl) = MAX( hi_max(jpl-1), 3._wp * h_i_2d(ji,jpl) - 2._wp * zhbnew(ji,jpl-1) )
ELSE
zhbnew(ji,jpl) = hi_max(jpl)
ENDIF
!
! --- 1 additional condition for remapping (1st category) --- !
! H0+epsi < h1(t) < H1-epsi
! h1(t) must not be too close to either HR or HL otherwise a division by nearly 0 is possible
! in itd_glinear in the case (HR-HL) = 3(Hice - HL) or = 3(HR - Hice)
# if defined key_single
IF( h_ib_2d(ji,1) < ( hi_max(0) + epsi06 ) ) nptidx(ji) = 0
IF( h_ib_2d(ji,1) > ( hi_max(1) - epsi06 ) ) nptidx(ji) = 0
# else
IF( h_ib_2d(ji,1) < ( hi_max(0) + epsi10 ) ) nptidx(ji) = 0
IF( h_ib_2d(ji,1) > ( hi_max(1) - epsi10 ) ) nptidx(ji) = 0
# endif
END DO
!
!-----------------------------------------------------------------------------------------------
! 3) Identify cells where remapping
!-----------------------------------------------------------------------------------------------
ipti = 0 ; iptidx(:) = 0
DO ji = 1, npti
IF( nptidx(ji) /= 0 ) THEN
ipti = ipti + 1
iptidx(ipti) = nptidx(ji)
zhbnew(ipti,:) = zhbnew(ji,:) ! adjust zhbnew to new indices
ENDIF
END DO
nptidx(:) = iptidx(:)
npti = ipti
!
ENDIF
!-----------------------------------------------------------------------------------------------
! 4) Compute g(h)
!-----------------------------------------------------------------------------------------------
IF( npti > 0 ) THEN
!
zhb0(:) = hi_max(0) ; zhb1(:) = hi_max(1) g0(:,:) = 0._wp ; g1(:,:) = 0._wp
hL(:,:) = 0._wp ; hR(:,:) = 0._wp
!
DO jl = 1, jpl
!
CALL tab_2d_1d( npti, nptidx(1:npti), h_ib_1d(1:npti), h_i_b(:,:,jl) )
CALL tab_2d_1d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i (:,:,jl) )
CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i (:,:,jl) )
CALL tab_2d_1d( npti, nptidx(1:npti), v_i_1d (1:npti), v_i (:,:,jl) )
!
IF( jl == 1 ) THEN
!
! --- g(h) for category 1 --- !
CALL itd_glinear( zhb0(1:npti) , zhb1(1:npti) , h_ib_1d(1:npti) , a_i_1d(1:npti) , & ! in
& g0 (1:npti,1), g1 (1:npti,1), hL (1:npti,1), hR (1:npti,1) ) ! out
!
! Area lost due to melting of thin ice
DO ji = 1, npti
!
IF( a_i_1d(ji) > epsi10 ) THEN
!
zdh0 = h_i_1d(ji) - h_ib_1d(ji)
IF( zdh0 < 0.0 ) THEN ! remove area from category 1
zdh0 = MIN( -zdh0, hi_max(1) )
!Integrate g(1) from 0 to dh0 to estimate area melted
zetamax = MIN( zdh0, hR(ji,1) ) - hL(ji,1)
!
IF( zetamax > 0.0 ) THEN
zx1 = zetamax
zx2 = 0.5 * zetamax * zetamax
zda0 = g1(ji,1) * zx2 + g0(ji,1) * zx1 ! ice area removed
zdamax = a_i_1d(ji) * (1.0 - h_i_1d(ji) / h_ib_1d(ji) ) ! Constrain new thickness <= h_i
zda0 = MIN( zda0, zdamax ) ! ice area lost due to melting of thin ice (zdamax > 0)
! Remove area, conserving volume
h_i_1d(ji) = h_i_1d(ji) * a_i_1d(ji) / ( a_i_1d(ji) - zda0 )
a_i_1d(ji) = a_i_1d(ji) - zda0
v_i_1d(ji) = a_i_1d(ji) * h_i_1d(ji) ! useless ?
ENDIF
!
ELSE ! if ice accretion zdh0 > 0
! zhbnew was 0, and is shifted to the right to account for thin ice growth in openwater (F0 = f1)
zhbnew(ji,0) = MIN( zdh0, hi_max(1) )
ENDIF
!
ENDIF
!
END DO
!
CALL tab_1d_2d( npti, nptidx(1:npti), h_i_1d(1:npti), h_i(:,:,jl) )
CALL tab_1d_2d( npti, nptidx(1:npti), a_i_1d(1:npti), a_i(:,:,jl) )
CALL tab_1d_2d( npti, nptidx(1:npti), v_i_1d(1:npti), v_i(:,:,jl) )
!
ENDIF ! jl=1
!
! --- g(h) for each thickness category --- !
CALL itd_glinear( zhbnew(1:npti,jl-1), zhbnew(1:npti,jl), h_i_1d(1:npti) , a_i_1d(1:npti) , & ! in
& g0 (1:npti,jl ), g1 (1:npti,jl), hL (1:npti,jl), hR (1:npti,jl) ) ! out
!
END DO
!-----------------------------------------------------------------------------------------------
! 5) Compute area and volume to be shifted across each boundary (Eq. 18)
!-----------------------------------------------------------------------------------------------
DO jl = 1, jpl - 1
!
DO ji = 1, npti
!
! left and right integration limits in eta space
IF (zhbnew(ji,jl) > hi_max(jl)) THEN ! Hn* > Hn => transfer from jl to jl+1
zetamin = MAX( hi_max(jl) , hL(ji,jl) ) - hL(ji,jl) ! hi_max(jl) - hL zetamax = MIN( zhbnew(ji,jl), hR(ji,jl) ) - hL(ji,jl) ! hR - hL
jdonor(ji,jl) = jl
ELSE ! Hn* <= Hn => transfer from jl+1 to jl
zetamin = 0.0
zetamax = MIN( hi_max(jl), hR(ji,jl+1) ) - hL(ji,jl+1) ! hi_max(jl) - hL
jdonor(ji,jl) = jl + 1
ENDIF
zetamax = MAX( zetamax, zetamin ) ! no transfer if etamax < etamin
!
zx1 = zetamax - zetamin
zwk1 = zetamin * zetamin
zwk2 = zetamax * zetamax
zx2 = 0.5 * ( zwk2 - zwk1 )
zwk1 = zwk1 * zetamin
zwk2 = zwk2 * zetamax
zx3 = 1.0 / 3.0 * ( zwk2 - zwk1 )
jcat = jdonor(ji,jl)
zdaice(ji,jl) = g1(ji,jcat)*zx2 + g0(ji,jcat)*zx1
zdvice(ji,jl) = g1(ji,jcat)*zx3 + g0(ji,jcat)*zx2 + zdaice(ji,jl)*hL(ji,jcat)
!
END DO
END DO
!----------------------------------------------------------------------------------------------
! 6) Shift ice between categories
!----------------------------------------------------------------------------------------------
CALL itd_shiftice ( jdonor(1:npti,:), zdaice(1:npti,:), zdvice(1:npti,:) )
!----------------------------------------------------------------------------------------------
! 7) Make sure h_i >= minimum ice thickness hi_min
!----------------------------------------------------------------------------------------------
CALL tab_2d_1d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i (:,:,1) )
CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i (:,:,1) )
CALL tab_2d_1d( npti, nptidx(1:npti), a_ip_1d(1:npti), a_ip(:,:,1) )
!
DO ji = 1, npti
IF ( a_i_1d(ji) > epsi10 .AND. h_i_1d(ji) < rn_himin ) THEN
a_i_1d(ji) = a_i_1d(ji) * h_i_1d(ji) / rn_himin
IF( ln_pnd_LEV .OR. ln_pnd_TOPO ) a_ip_1d(ji) = a_ip_1d(ji) * h_i_1d(ji) / rn_himin
h_i_1d(ji) = rn_himin
ENDIF
END DO
!
CALL tab_1d_2d( npti, nptidx(1:npti), h_i_1d (1:npti), h_i (:,:,1) )
CALL tab_1d_2d( npti, nptidx(1:npti), a_i_1d (1:npti), a_i (:,:,1) )
CALL tab_1d_2d( npti, nptidx(1:npti), a_ip_1d(1:npti), a_ip(:,:,1) )
!
ENDIF
!
IF( ln_icediachk ) CALL ice_cons_hsm(1, 'iceitd_rem', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft)
IF( ln_icediachk ) CALL ice_cons2D (1, 'iceitd_rem', diag_v, diag_s, diag_t, diag_fv, diag_fs, diag_ft)
IF( ln_timing ) CALL timing_stop ('iceitd_rem')
!
END SUBROUTINE ice_itd_rem
SUBROUTINE itd_glinear( HbL, Hbr, phice, paice, pg0, pg1, phL, phR )
!!------------------------------------------------------------------
!! *** ROUTINE itd_glinear ***
!!
!! ** Purpose : build g(h) satisfying area and volume constraints (Eq. 6 and 9)
!!
!! ** Method : g(h) is linear and written as: g(eta) = g1(eta) + g0
!! with eta = h - HL
!!------------------------------------------------------------------
REAL(wp), DIMENSION(:), INTENT(in ) :: HbL, HbR ! left and right category boundaries
REAL(wp), DIMENSION(:), INTENT(in ) :: phice, paice ! ice thickness and concentration
REAL(wp), DIMENSION(:), INTENT(inout) :: pg0, pg1 ! coefficients in linear equation for g(eta)
REAL(wp), DIMENSION(:), INTENT(inout) :: phL, phR ! min and max value of range over which g(h) > 0
! INTEGER :: ji ! horizontal indices
REAL(wp) :: z1_3 , z2_3 ! 1/3 , 2/3
REAL(wp) :: zh13 ! HbL + 1/3 * (HbR - HbL)
REAL(wp) :: zh23 ! HbL + 2/3 * (HbR - HbL)
REAL(wp) :: zdhr ! 1 / (hR - hL)
REAL(wp) :: zwk1, zwk2 ! temporary variables
!!------------------------------------------------------------------
!
z1_3 = 1._wp / 3._wp
z2_3 = 2._wp / 3._wp
!
DO ji = 1, npti
!
IF( paice(ji) > epsi10 .AND. phice(ji) > epsi10 ) THEN
!
! Initialize hL and hR
phL(ji) = HbL(ji)
phR(ji) = HbR(ji)
!
! Change hL or hR if hice falls outside central third of range,
! so that hice is in the central third of the range [HL HR]
zh13 = z1_3 * ( 2._wp * phL(ji) + phR(ji) )
zh23 = z1_3 * ( phL(ji) + 2._wp * phR(ji) )
!
IF ( phice(ji) < zh13 ) THEN ; phR(ji) = 3._wp * phice(ji) - 2._wp * phL(ji) ! move HR to the left
ELSEIF( phice(ji) > zh23 ) THEN ; phL(ji) = 3._wp * phice(ji) - 2._wp * phR(ji) ! move HL to the right
ENDIF
!
! Compute coefficients of g(eta) = g0 + g1*eta
IF( phR(ji) > phL(ji) ) THEN ; zdhr = 1._wp / (phR(ji) - phL(ji))
ELSE ; zdhr = 0._wp ! if hR=hL=hice => no remapping
ENDIF
!!zdhr = 1._wp / (phR(ji) - phL(ji))
zwk1 = 6._wp * paice(ji) * zdhr
zwk2 = ( phice(ji) - phL(ji) ) * zdhr
pg0(ji) = zwk1 * ( z2_3 - zwk2 ) ! Eq. 14
pg1(ji) = 2._wp * zdhr * zwk1 * ( zwk2 - 0.5_wp ) ! Eq. 14
!
ELSE ! remap_flag = .false. or a_i < epsi10
phL(ji) = 0._wp
phR(ji) = 0._wp
pg0(ji) = 0._wp
pg1(ji) = 0._wp
ENDIF
!
END DO
!
END SUBROUTINE itd_glinear
SUBROUTINE itd_shiftice( kdonor, pdaice, pdvice )
!!------------------------------------------------------------------
!! *** ROUTINE itd_shiftice ***
!!
!! ** Purpose : shift ice across category boundaries, conserving everything
!! ( area, volume, energy, age*vol, and mass of salt )
!!------------------------------------------------------------------
INTEGER , DIMENSION(:,:), INTENT(in) :: kdonor ! donor category index
REAL(wp), DIMENSION(:,:), INTENT(in) :: pdaice ! ice area transferred across boundary
REAL(wp), DIMENSION(:,:), INTENT(in) :: pdvice ! ice volume transferred across boundary
!
INTEGER :: ji, jl, jk ! dummy loop indices
INTEGER :: jl2, jl1 ! local integers
REAL(wp) :: ztrans ! ice/snow transferred
REAL(wp), DIMENSION(jpij) :: zworka, zworkv ! workspace
REAL(wp), DIMENSION(jpij,jpl) :: zaTsfn ! - -
REAL(wp), DIMENSION(jpij,nlay_i,jpl) :: ze_i_2d
REAL(wp), DIMENSION(jpij,nlay_s,jpl) :: ze_s_2d
!!------------------------------------------------------------------
CALL tab_3d_2d( npti, nptidx(1:npti), h_i_2d (1:npti,1:jpl), h_i )
CALL tab_3d_2d( npti, nptidx(1:npti), a_i_2d (1:npti,1:jpl), a_i )
CALL tab_3d_2d( npti, nptidx(1:npti), v_i_2d (1:npti,1:jpl), v_i )
CALL tab_3d_2d( npti, nptidx(1:npti), v_s_2d (1:npti,1:jpl), v_s )
CALL tab_3d_2d( npti, nptidx(1:npti), oa_i_2d(1:npti,1:jpl), oa_i )
CALL tab_3d_2d( npti, nptidx(1:npti), sv_i_2d(1:npti,1:jpl), sv_i )
CALL tab_3d_2d( npti, nptidx(1:npti), a_ip_2d(1:npti,1:jpl), a_ip )
CALL tab_3d_2d( npti, nptidx(1:npti), v_ip_2d(1:npti,1:jpl), v_ip )
CALL tab_3d_2d( npti, nptidx(1:npti), v_il_2d(1:npti,1:jpl), v_il )
CALL tab_3d_2d( npti, nptidx(1:npti), t_su_2d(1:npti,1:jpl), t_su )
DO jl = 1, jpl
DO jk = 1, nlay_s
CALL tab_2d_1d( npti, nptidx(1:npti), ze_s_2d(1:npti,jk,jl), e_s(:,:,jk,jl) )
END DO
DO jk = 1, nlay_i
CALL tab_2d_1d( npti, nptidx(1:npti), ze_i_2d(1:npti,jk,jl), e_i(:,:,jk,jl) )
END DO
END DO
! to correct roundoff errors on a_i
CALL tab_2d_1d( npti, nptidx(1:npti), rn_amax_1d(1:npti), rn_amax_2d )
!----------------------------------------------------------------------------------------------
! 1) Define a variable equal to a_i*T_su
!----------------------------------------------------------------------------------------------
DO jl = 1, jpl
DO ji = 1, npti
zaTsfn(ji,jl) = a_i_2d(ji,jl) * t_su_2d(ji,jl)
END DO
END DO
!-------------------------------------------------------------------------------
! 2) Transfer volume and energy between categories
!-------------------------------------------------------------------------------
DO jl = 1, jpl - 1
DO ji = 1, npti
!
jl1 = kdonor(ji,jl)
!
IF( jl1 > 0 ) THEN
!
IF ( jl1 == jl ) THEN ; jl2 = jl1+1
ELSE ; jl2 = jl
ENDIF
!
IF( v_i_2d(ji,jl1) >= epsi10 ) THEN ; zworkv(ji) = pdvice(ji,jl) / v_i_2d(ji,jl1)
ELSE ; zworkv(ji) = 0._wp
ENDIF
IF( a_i_2d(ji,jl1) >= epsi10 ) THEN ; zworka(ji) = pdaice(ji,jl) / a_i_2d(ji,jl1)
ELSE ; zworka(ji) = 0._wp
ENDIF
!
a_i_2d(ji,jl1) = a_i_2d(ji,jl1) - pdaice(ji,jl) ! Ice areas
a_i_2d(ji,jl2) = a_i_2d(ji,jl2) + pdaice(ji,jl)
!
v_i_2d(ji,jl1) = v_i_2d(ji,jl1) - pdvice(ji,jl) ! Ice volumes
v_i_2d(ji,jl2) = v_i_2d(ji,jl2) + pdvice(ji,jl)
!
ztrans = v_s_2d(ji,jl1) * zworkv(ji) ! Snow volumes
v_s_2d(ji,jl1) = v_s_2d(ji,jl1) - ztrans
v_s_2d(ji,jl2) = v_s_2d(ji,jl2) + ztrans
!
ztrans = oa_i_2d(ji,jl1) * zworka(ji) ! Ice age
oa_i_2d(ji,jl1) = oa_i_2d(ji,jl1) - ztrans
oa_i_2d(ji,jl2) = oa_i_2d(ji,jl2) + ztrans
!
ztrans = sv_i_2d(ji,jl1) * zworkv(ji) ! Ice salinity
sv_i_2d(ji,jl1) = sv_i_2d(ji,jl1) - ztrans
sv_i_2d(ji,jl2) = sv_i_2d(ji,jl2) + ztrans
!
ztrans = zaTsfn(ji,jl1) * zworka(ji) ! Surface temperature zaTsfn(ji,jl1) = zaTsfn(ji,jl1) - ztrans
zaTsfn(ji,jl2) = zaTsfn(ji,jl2) + ztrans
!
IF ( ln_pnd_LEV .OR. ln_pnd_TOPO ) THEN
ztrans = a_ip_2d(ji,jl1) * zworka(ji) ! Pond fraction
a_ip_2d(ji,jl1) = a_ip_2d(ji,jl1) - ztrans
a_ip_2d(ji,jl2) = a_ip_2d(ji,jl2) + ztrans
!
ztrans = v_ip_2d(ji,jl1) * zworkv(ji) ! Pond volume
v_ip_2d(ji,jl1) = v_ip_2d(ji,jl1) - ztrans
v_ip_2d(ji,jl2) = v_ip_2d(ji,jl2) + ztrans
!
IF ( ln_pnd_lids ) THEN ! Pond lid volume
ztrans = v_il_2d(ji,jl1) * zworkv(ji)
v_il_2d(ji,jl1) = v_il_2d(ji,jl1) - ztrans
v_il_2d(ji,jl2) = v_il_2d(ji,jl2) + ztrans
ENDIF
ENDIF
!
ENDIF ! jl1 >0
END DO
!
DO jk = 1, nlay_s !--- Snow heat content
DO ji = 1, npti
!
jl1 = kdonor(ji,jl)
!
IF( jl1 > 0 ) THEN
IF(jl1 == jl) THEN ; jl2 = jl+1
ELSE ; jl2 = jl
ENDIF
ztrans = ze_s_2d(ji,jk,jl1) * zworkv(ji)
ze_s_2d(ji,jk,jl1) = ze_s_2d(ji,jk,jl1) - ztrans
ze_s_2d(ji,jk,jl2) = ze_s_2d(ji,jk,jl2) + ztrans
ENDIF
END DO
END DO
!
DO jk = 1, nlay_i !--- Ice heat content
DO ji = 1, npti
!
jl1 = kdonor(ji,jl)
!
IF( jl1 > 0 ) THEN
IF(jl1 == jl) THEN ; jl2 = jl+1
ELSE ; jl2 = jl
ENDIF
ztrans = ze_i_2d(ji,jk,jl1) * zworkv(ji)
ze_i_2d(ji,jk,jl1) = ze_i_2d(ji,jk,jl1) - ztrans
ze_i_2d(ji,jk,jl2) = ze_i_2d(ji,jk,jl2) + ztrans
ENDIF
END DO
END DO
!
END DO ! boundaries, 1 to jpl-1
!-------------------
! 3) roundoff errors
!-------------------
! clem: The transfer between one category to another can lead to very small negative values (-1.e-20)
! because of truncation error ( i.e. 1. - 1. /= 0 )
CALL ice_var_roundoff( a_i_2d, v_i_2d, v_s_2d, sv_i_2d, oa_i_2d, a_ip_2d, v_ip_2d, v_il_2d, ze_s_2d, ze_i_2d )
! at_i must be <= rn_amax
zworka(1:npti) = SUM( a_i_2d(1:npti,:), dim=2 )
DO jl = 1, jpl
WHERE( zworka(1:npti) > rn_amax_1d(1:npti) ) &
& a_i_2d(1:npti,jl) = a_i_2d(1:npti,jl) * rn_amax_1d(1:npti) / zworka(1:npti)
END DO
!-------------------------------------------------------------------------------
! 4) Update ice thickness and temperature
!-------------------------------------------------------------------------------
# if defined key_single
WHERE( a_i_2d(1:npti,:) >= epsi06 )
# else
WHERE( a_i_2d(1:npti,:) >= epsi20 )
# endif
h_i_2d (1:npti,:) = v_i_2d(1:npti,:) / a_i_2d(1:npti,:)
t_su_2d(1:npti,:) = zaTsfn(1:npti,:) / a_i_2d(1:npti,:)
ELSEWHERE
h_i_2d (1:npti,:) = 0._wp
t_su_2d(1:npti,:) = rt0
END WHERE
!
CALL tab_2d_3d( npti, nptidx(1:npti), h_i_2d (1:npti,1:jpl), h_i )
CALL tab_2d_3d( npti, nptidx(1:npti), a_i_2d (1:npti,1:jpl), a_i )
CALL tab_2d_3d( npti, nptidx(1:npti), v_i_2d (1:npti,1:jpl), v_i )
CALL tab_2d_3d( npti, nptidx(1:npti), v_s_2d (1:npti,1:jpl), v_s )
CALL tab_2d_3d( npti, nptidx(1:npti), oa_i_2d(1:npti,1:jpl), oa_i )
CALL tab_2d_3d( npti, nptidx(1:npti), sv_i_2d(1:npti,1:jpl), sv_i )
CALL tab_2d_3d( npti, nptidx(1:npti), a_ip_2d(1:npti,1:jpl), a_ip )
CALL tab_2d_3d( npti, nptidx(1:npti), v_ip_2d(1:npti,1:jpl), v_ip )
CALL tab_2d_3d( npti, nptidx(1:npti), v_il_2d(1:npti,1:jpl), v_il )
CALL tab_2d_3d( npti, nptidx(1:npti), t_su_2d(1:npti,1:jpl), t_su )
DO jl = 1, jpl
DO jk = 1, nlay_s
CALL tab_1d_2d( npti, nptidx(1:npti), ze_s_2d(1:npti,jk,jl), e_s(:,:,jk,jl) )
END DO
DO jk = 1, nlay_i
CALL tab_1d_2d( npti, nptidx(1:npti), ze_i_2d(1:npti,jk,jl), e_i(:,:,jk,jl) )
END DO
END DO
!
END SUBROUTINE itd_shiftice
SUBROUTINE ice_itd_reb( kt )
!!------------------------------------------------------------------
!! *** ROUTINE ice_itd_reb ***
!!
!! ** Purpose : rebin - rebins thicknesses into defined categories
!!
!! ** Method : If a category thickness is out of bounds, shift part (for down to top)
!! or entire (for top to down) area, volume, and energy
!! to the neighboring category
!!------------------------------------------------------------------
INTEGER , INTENT (in) :: kt ! Ocean time step
INTEGER :: ji, jj, jl ! dummy loop indices
!
INTEGER , DIMENSION(jpij,jpl-1) :: jdonor ! donor category index
REAL(wp), DIMENSION(jpij,jpl-1) :: zdaice, zdvice ! ice area and volume transferred
!!------------------------------------------------------------------
IF( ln_timing ) CALL timing_start('iceitd_reb')
!
IF( kt == nit000 .AND. lwp ) WRITE(numout,*) '-- ice_itd_reb: rebining ice thickness distribution'
!
IF( ln_icediachk ) CALL ice_cons_hsm(0, 'iceitd_reb', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft)
IF( ln_icediachk ) CALL ice_cons2D (0, 'iceitd_reb', diag_v, diag_s, diag_t, diag_fv, diag_fs, diag_ft)
!
jdonor(:,:) = 0
zdaice(:,:) = 0._wp
zdvice(:,:) = 0._wp
!
! !---------------------------------------
DO jl = 1, jpl-1 ! identify thicknesses that are too big
! !---------------------------------------
npti = 0 ; nptidx(:) = 0
DO_2D( nn_hls, nn_hls, nn_hls, nn_hls )
IF( a_i(ji,jj,jl) > 0._wp .AND. v_i(ji,jj,jl) > (a_i(ji,jj,jl) * hi_max(jl)) ) THEN npti = npti + 1
nptidx( npti ) = (jj - 1) * jpi + ji
ENDIF
END_2D
!
IF( npti > 0 ) THEN
!!clem CALL tab_2d_1d( npti, nptidx(1:npti), h_i_1d(1:npti), h_i(:,:,jl) )
CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d(1:npti), a_i(:,:,jl) )
CALL tab_2d_1d( npti, nptidx(1:npti), v_i_1d(1:npti), v_i(:,:,jl) )
!
DO ji = 1, npti
jdonor(ji,jl) = jl
! how much of a_i you send in cat sup is somewhat arbitrary
! these are from CICE => transfer everything
!!zdaice(ji,jl) = a_i_1d(ji)
!!zdvice(ji,jl) = v_i_1d(ji)
! these are from LLN => transfer only half of the category
zdaice(ji,jl) = 0.5_wp * a_i_1d(ji)
zdvice(ji,jl) = v_i_1d(ji) - (1._wp - 0.5_wp) * a_i_1d(ji) * hi_mean(jl)
END DO
!
CALL itd_shiftice( jdonor(1:npti,:), zdaice(1:npti,:), zdvice(1:npti,:) ) ! Shift jl=>jl+1
! Reset shift parameters
jdonor(1:npti,jl) = 0
zdaice(1:npti,jl) = 0._wp
zdvice(1:npti,jl) = 0._wp
ENDIF
!
END DO
! !-----------------------------------------
DO jl = jpl-1, 1, -1 ! Identify thicknesses that are too small
! !-----------------------------------------
npti = 0 ; nptidx(:) = 0
DO_2D( nn_hls, nn_hls, nn_hls, nn_hls )
IF( a_i(ji,jj,jl+1) > 0._wp .AND. v_i(ji,jj,jl+1) <= (a_i(ji,jj,jl+1) * hi_max(jl)) ) THEN
npti = npti + 1
nptidx( npti ) = (jj - 1) * jpi + ji
ENDIF
END_2D
!
IF( npti > 0 ) THEN
CALL tab_2d_1d( npti, nptidx(1:npti), a_i_1d(1:npti), a_i(:,:,jl+1) ) ! jl+1 is ok
CALL tab_2d_1d( npti, nptidx(1:npti), v_i_1d(1:npti), v_i(:,:,jl+1) ) ! jl+1 is ok
DO ji = 1, npti
jdonor(ji,jl) = jl + 1
zdaice(ji,jl) = a_i_1d(ji)
zdvice(ji,jl) = v_i_1d(ji)
END DO
!
CALL itd_shiftice( jdonor(1:npti,:), zdaice(1:npti,:), zdvice(1:npti,:) ) ! Shift jl+1=>jl
! Reset shift parameters
jdonor(1:npti,jl) = 0
zdaice(1:npti,jl) = 0._wp
zdvice(1:npti,jl) = 0._wp
ENDIF
!
END DO
!
IF( ln_icediachk ) CALL ice_cons_hsm(1, 'iceitd_reb', rdiag_v, rdiag_s, rdiag_t, rdiag_fv, rdiag_fs, rdiag_ft)
IF( ln_icediachk ) CALL ice_cons2D (1, 'iceitd_reb', diag_v, diag_s, diag_t, diag_fv, diag_fs, diag_ft)
IF( ln_timing ) CALL timing_stop ('iceitd_reb')
!
END SUBROUTINE ice_itd_reb
SUBROUTINE ice_itd_init
!!------------------------------------------------------------------
!! *** ROUTINE ice_itd_init ***
!! !! ** Purpose : Initializes the ice thickness distribution
!! ** Method : ...
!! ** input : Namelist namitd
!!-------------------------------------------------------------------
INTEGER :: jl ! dummy loop index
INTEGER :: ios, ioptio ! Local integer output status for namelist read
REAL(wp) :: zhmax, znum, zden, zalpha ! - -
!
NAMELIST/namitd/ ln_cat_hfn, rn_himean, ln_cat_usr, rn_catbnd, rn_himin, rn_himax
!!------------------------------------------------------------------
!
READ ( numnam_ice_ref, namitd, IOSTAT = ios, ERR = 901)
901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namitd in reference namelist' )
READ ( numnam_ice_cfg, namitd, IOSTAT = ios, ERR = 902 )
902 IF( ios > 0 ) CALL ctl_nam ( ios , 'namitd in configuration namelist' )
IF(lwm) WRITE( numoni, namitd )
!
IF(lwp) THEN ! control print
WRITE(numout,*)
WRITE(numout,*) 'ice_itd_init: Initialization of ice cat distribution '
WRITE(numout,*) '~~~~~~~~~~~~'
WRITE(numout,*) ' Namelist namitd: '
WRITE(numout,*) ' Ice categories are defined by a function of rn_himean**(-0.05) ln_cat_hfn = ', ln_cat_hfn
WRITE(numout,*) ' mean ice thickness in the domain rn_himean = ', rn_himean
WRITE(numout,*) ' Ice categories are defined by rn_catbnd ln_cat_usr = ', ln_cat_usr
WRITE(numout,*) ' minimum ice thickness allowed rn_himin = ', rn_himin
WRITE(numout,*) ' maximum ice thickness allowed rn_himax = ', rn_himax
ENDIF
!
!-----------------------------------!
! Thickness categories boundaries !
!-----------------------------------!
! !== set the choice of ice categories ==!
ioptio = 0
IF( ln_cat_hfn ) THEN ; ioptio = ioptio + 1 ; nice_catbnd = np_cathfn ; ENDIF
IF( ln_cat_usr ) THEN ; ioptio = ioptio + 1 ; nice_catbnd = np_catusr ; ENDIF
IF( ioptio /= 1 ) CALL ctl_stop( 'ice_itd_init: choose one and only one ice categories boundaries' )
!
SELECT CASE( nice_catbnd )
! !------------------------!
CASE( np_cathfn ) ! h^(-alpha) function
! !------------------------!
zalpha = 0.05_wp
zhmax = 3._wp * rn_himean
hi_max(0) = 0._wp
DO jl = 1, jpl
znum = jpl * ( zhmax+1 )**zalpha
zden = REAL( jpl-jl , wp ) * ( zhmax + 1._wp )**zalpha + REAL( jl , wp )
hi_max(jl) = ( znum / zden )**(1./zalpha) - 1
END DO
! !------------------------!
CASE( np_catusr ) ! user defined
! !------------------------!
DO jl = 0, jpl
hi_max(jl) = rn_catbnd(jl)
END DO
!
END SELECT
!
DO jl = 1, jpl ! mean thickness by category
hi_mean(jl) = ( hi_max(jl) + hi_max(jl-1) ) * 0.5_wp
END DO
!
hi_max(jpl) = rn_himax ! set to a big value to ensure that all ice is thinner than hi_max(jpl)
!
IF(lwp) WRITE(numout,*)
IF(lwp) WRITE(numout,*) ' ===>>> resulting thickness category boundaries :'
IF(lwp) WRITE(numout,*) ' hi_max(:)= ', hi_max(0:jpl)
!
IF( hi_max(1) < rn_himin ) CALL ctl_stop('ice_itd_init: the upper bound of the 1st category must be bigger than rn_himin') !
END SUBROUTINE ice_itd_init
#else
!!----------------------------------------------------------------------
!! Default option : Empty module NO SI3 sea-ice model
!!----------------------------------------------------------------------
#endif
!!======================================================================
END MODULE iceitd