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MODULE ldfslp
!!======================================================================
!! *** MODULE ldfslp ***
!! Ocean physics: slopes of neutral surfaces
!!======================================================================
!! History : OPA ! 1994-12 (G. Madec, M. Imbard) Original code
!! 8.0 ! 1997-06 (G. Madec) optimization, lbc
!! 8.1 ! 1999-10 (A. Jouzeau) NEW profile in the mixed layer
!! NEMO 1.0 ! 2002-10 (G. Madec) Free form, F90
!! - ! 2005-10 (A. Beckmann) correction for s-coordinates
!! 3.3 ! 2010-10 (G. Nurser, C. Harris, G. Madec) add Griffies operator
!! - ! 2010-11 (F. Dupond, G. Madec) bug correction in slopes just below the ML
!! 3.7 ! 2013-12 (F. Lemarie, G. Madec) add limiter on triad slopes
!!----------------------------------------------------------------------
!!----------------------------------------------------------------------
!! ldf_slp : calculates the slopes of neutral surface (Madec operator)
!! ldf_slp_triad : calculates the triads of isoneutral slopes (Griffies operator)
!! ldf_slp_mxl : calculates the slopes at the base of the mixed layer (Madec operator)
!! ldf_slp_init : initialization of the slopes computation
!!----------------------------------------------------------------------
USE oce ! ocean dynamics and tracers
USE isf_oce ! ice shelf
USE dom_oce ! ocean space and time domain
! USE ldfdyn ! lateral diffusion: eddy viscosity coef.
USE phycst ! physical constants
USE zdfmxl ! mixed layer depth
USE eosbn2 ! equation of states
!
USE in_out_manager ! I/O manager
USE prtctl ! Print control
USE lbclnk ! ocean lateral boundary conditions (or mpp link)
USE lib_mpp ! distribued memory computing library
USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
USE timing ! Timing
IMPLICIT NONE
PRIVATE
PUBLIC ldf_slp ! routine called by step.F90
PUBLIC ldf_slp_triad ! routine called by step.F90
PUBLIC ldf_slp_init ! routine called by nemogcm.F90
LOGICAL , PUBLIC :: l_ldfslp = .FALSE. !: slopes flag
LOGICAL , PUBLIC :: ln_traldf_iso = .TRUE. !: iso-neutral direction (nam_traldf namelist)
LOGICAL , PUBLIC :: ln_traldf_triad = .FALSE. !: griffies triad scheme (nam_traldf namelist)
LOGICAL , PUBLIC :: ln_dynldf_iso !: iso-neutral direction (nam_dynldf namelist)
LOGICAL , PUBLIC :: ln_triad_iso = .FALSE. !: pure horizontal mixing in ML (nam_traldf namelist)
LOGICAL , PUBLIC :: ln_botmix_triad = .FALSE. !: mixing on bottom (nam_traldf namelist)
REAL(wp), PUBLIC :: rn_sw_triad = 1._wp !: =1 switching triads ; =0 all four triads used (nam_traldf namelist)
REAL(wp), PUBLIC :: rn_slpmax = 0.01_wp !: slope limit (nam_traldf namelist)
LOGICAL , PUBLIC :: l_grad_zps = .FALSE. !: special treatment for Horz Tgradients w partial steps (triad operator)
! !! Classic operator (Madec)
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: uslp, wslpi !: i_slope at U- and W-points
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: vslp, wslpj !: j-slope at V- and W-points
! !! triad operator (Griffies)
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: wslp2 !: wslp**2 from Griffies quarter cells
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:,:,:) :: triadi_g, triadj_g !: skew flux slopes relative to geopotentials
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:,:,:) :: triadi , triadj !: isoneutral slopes relative to model-coordinate
! !! both operators
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: ah_wslp2 !: ah * slope^2 at w-point
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: akz !: stabilizing vertical diffusivity
! !! Madec operator
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: omlmask ! mask of the surface mixed layer at T-pt
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: uslpml, wslpiml ! i_slope at U- and W-points just below the mixed layer
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: vslpml, wslpjml ! j_slope at V- and W-points just below the mixed layer
REAL(wp) :: repsln = 1.e-25_wp ! tiny value used as minium of di(rho), dj(rho) and dk(rho)
!! * Substitutions
# include "do_loop_substitute.h90"
# include "domzgr_substitute.h90"
!!----------------------------------------------------------------------
!! NEMO/OCE 4.0 , NEMO Consortium (2018)
!! $Id: ldfslp.F90 15062 2021-06-28 11:19:48Z jchanut $
!! Software governed by the CeCILL license (see ./LICENSE)
!!----------------------------------------------------------------------
CONTAINS
SUBROUTINE ldf_slp( kt, prd, pn2, Kbb, Kmm )
!!----------------------------------------------------------------------
!! *** ROUTINE ldf_slp ***
!!
!! ** Purpose : Compute the slopes of neutral surface (slope of isopycnal
!! surfaces referenced locally) (ln_traldf_iso=T).
!!
!! ** Method : The slope in the i-direction is computed at U- and
!! W-points (uslp, wslpi) and the slope in the j-direction is
!! computed at V- and W-points (vslp, wslpj).
!! They are bounded by 1/100 over the whole ocean, and within the
!! surface layer they are bounded by the distance to the surface
!! ( slope<= depth/l where l is the length scale of horizontal
!! diffusion (here, aht=2000m2/s ==> l=20km with a typical velocity
!! of 10cm/s)
!! A horizontal shapiro filter is applied to the slopes
!! ln_sco=T, s-coordinate, add to the previously computed slopes
!! the slope of the model level surface.
!! macro-tasked on horizontal slab (jk-loop) (2, jpk-1)
!! [slopes already set to zero at level 1, and to zero or the ocean
!! bottom slope (ln_sco=T) at level jpk in inildf]
!!
!! ** Action : - uslp, wslpi, and vslp, wslpj, the i- and j-slopes
!! of now neutral surfaces at u-, w- and v- w-points, resp.
!!----------------------------------------------------------------------
INTEGER , INTENT(in) :: kt ! ocean time-step index
INTEGER , INTENT(in) :: Kbb, Kmm ! ocean time level indices
REAL(wp), INTENT(in), DIMENSION(:,:,:) :: prd ! in situ density
REAL(wp), INTENT(in), DIMENSION(:,:,:) :: pn2 ! Brunt-Vaisala frequency (locally ref.)
!!
INTEGER :: ji , jj , jk ! dummy loop indices
REAL(wp) :: zeps, zm1_g, zm1_2g, z1_16, zcofw, z1_slpmax ! local scalars
REAL(wp) :: zci, zfi, zau, zbu, zai, zbi ! - -
REAL(wp) :: zcj, zfj, zav, zbv, zaj, zbj ! - -
REAL(wp) :: zck, zfk, zbw ! - -
REAL(wp) :: zdepu, zdepv ! - -
REAL(wp), DIMENSION(A2D(0)) :: zslpml_hmlpu, zslpml_hmlpv
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REAL(wp), DIMENSION(jpi,jpj,jpk) :: zgru, zwz, zdzr
REAL(wp), DIMENSION(jpi,jpj,jpk) :: zgrv, zww
!!----------------------------------------------------------------------
!
IF( ln_timing ) CALL timing_start('ldf_slp')
!
zeps = 1.e-20_wp !== Local constant initialization ==!
z1_16 = 1.0_wp / 16._wp
zm1_g = -1.0_wp / grav
zm1_2g = -0.5_wp / grav
z1_slpmax = 1._wp / rn_slpmax
!
zww(:,:,:) = 0._wp
zwz(:,:,:) = 0._wp
!
DO_3D( 1, 0, 1, 0, 1, jpk ) !== i- & j-gradient of density ==!
zgru(ji,jj,jk) = umask(ji,jj,jk) * ( prd(ji+1,jj ,jk) - prd(ji,jj,jk) )
zgrv(ji,jj,jk) = vmask(ji,jj,jk) * ( prd(ji ,jj+1,jk) - prd(ji,jj,jk) )
END_3D
IF( ln_zps ) THEN ! partial steps correction at the bottom ocean level
DO_2D( 1, 0, 1, 0 )
zgru(ji,jj,mbku(ji,jj)) = gru(ji,jj)
zgrv(ji,jj,mbkv(ji,jj)) = grv(ji,jj)
END_2D
ENDIF
IF( ln_zps .AND. ln_isfcav ) THEN ! partial steps correction at the bottom ocean level
DO_2D( 1, 0, 1, 0 )
IF( miku(ji,jj) > 1 ) zgru(ji,jj,miku(ji,jj)) = grui(ji,jj)
IF( mikv(ji,jj) > 1 ) zgrv(ji,jj,mikv(ji,jj)) = grvi(ji,jj)
END_2D
ENDIF
!
zdzr(:,:,1) = 0._wp !== Local vertical density gradient at T-point == ! (evaluated from N^2)
DO jk = 2, jpkm1
! ! zdzr = d/dz(prd)= - ( prd ) / grav * mk(pn2) -- at t point
! ! trick: tmask(ik ) = 0 => all pn2 = 0 => zdzr = 0
! ! else tmask(ik+1) = 0 => pn2(ik+1) = 0 => zdzr divides by 1
! ! umask(ik+1) /= 0 => all pn2 /= 0 => zdzr divides by 2
! ! NB: 1/(tmask+1) = (1-.5*tmask) substitute a / by a * ==> faster
zdzr(:,:,jk) = zm1_g * ( prd(:,:,jk) + 1._wp ) &
& * ( pn2(:,:,jk) + pn2(:,:,jk+1) ) * ( 1._wp - 0.5_wp * tmask(:,:,jk+1) )
END DO
!
! !== Slopes just below the mixed layer ==!
CALL ldf_slp_mxl( prd, pn2, zgru, zgrv, zdzr, Kmm ) ! output: uslpml, vslpml, wslpiml, wslpjml
! I. slopes at u and v point | uslp = d/di( prd ) / d/dz( prd )
! =========================== | vslp = d/dj( prd ) / d/dz( prd )
!
IF ( ln_isfcav ) THEN
DO_2D( 0, 0, 0, 0 )
zslpml_hmlpu(ji,jj) = uslpml(ji,jj) / ( MAX(hmlpt (ji,jj), hmlpt (ji+1,jj ), 5._wp) &
& - MAX(risfdep(ji,jj), risfdep(ji+1,jj ) ) )
zslpml_hmlpv(ji,jj) = vslpml(ji,jj) / ( MAX(hmlpt (ji,jj), hmlpt (ji ,jj+1), 5._wp) &
& - MAX(risfdep(ji,jj), risfdep(ji ,jj+1) ) )
END_2D
ELSE
DO_2D( 0, 0, 0, 0 )
zslpml_hmlpu(ji,jj) = uslpml(ji,jj) / MAX(hmlpt(ji,jj), hmlpt(ji+1,jj ), 5._wp)
zslpml_hmlpv(ji,jj) = vslpml(ji,jj) / MAX(hmlpt(ji,jj), hmlpt(ji ,jj+1), 5._wp)
END_2D
END IF
DO_3D( 0, 0, 0, 0, 2, jpkm1 ) !* Slopes at u and v points
! ! horizontal and vertical density gradient at u- and v-points
zau = zgru(ji,jj,jk) * r1_e1u(ji,jj)
zav = zgrv(ji,jj,jk) * r1_e2v(ji,jj)
zbu = 0.5_wp * ( zdzr(ji,jj,jk) + zdzr(ji+1,jj ,jk) )
zbv = 0.5_wp * ( zdzr(ji,jj,jk) + zdzr(ji ,jj+1,jk) )
! ! bound the slopes: abs(zw.)<= 1/100 and zb..<0
! ! + kxz max= ah slope max =< e1 e3 /(pi**2 2 dt)
zbu = MIN( zbu, - z1_slpmax * ABS( zau ) , -7.e+3_wp/e3u(ji,jj,jk,Kmm)* ABS( zau ) )
zbv = MIN( zbv, - z1_slpmax * ABS( zav ) , -7.e+3_wp/e3v(ji,jj,jk,Kmm)* ABS( zav ) )
! ! Fred Dupont: add a correction for bottom partial steps:
! ! max slope = 1/2 * e3 / e1
IF (ln_zps .AND. jk==mbku(ji,jj)) &
zbu = MIN( zbu, - z1_slpmax * ABS( zau ) , &
& - 2._wp * e1u(ji,jj) / e3u(ji,jj,jk,Kmm)* ABS( zau ) )
IF (ln_zps .AND. jk==mbkv(ji,jj)) &
zbv = MIN( zbv, - z1_slpmax * ABS( zav ) , &
& - 2._wp * e2v(ji,jj) / e3v(ji,jj,jk,Kmm)* ABS( zav ) )
! ! uslp and vslp output in zwz and zww, resp.
zfi = MAX( omlmask(ji,jj,jk), omlmask(ji+1,jj,jk) )
zfj = MAX( omlmask(ji,jj,jk), omlmask(ji,jj+1,jk) )
! thickness of water column between surface and level k at u/v point
zdepu = 0.5_wp * ( ( gdept(ji,jj,jk,Kmm) + gdept(ji+1,jj,jk,Kmm) ) &
& - 2 * MAX( risfdep(ji,jj), risfdep(ji+1,jj) ) &
& - e3u(ji,jj,miku(ji,jj),Kmm) )
zdepv = 0.5_wp * ( ( gdept(ji,jj,jk,Kmm) + gdept(ji,jj+1,jk,Kmm) ) &
& - 2 * MAX( risfdep(ji,jj), risfdep(ji,jj+1) ) &
& - e3v(ji,jj,mikv(ji,jj),Kmm) )
!
zwz(ji,jj,jk) = ( ( 1._wp - zfi) * zau / ( zbu - zeps ) &
& + zfi * zdepu * zslpml_hmlpu(ji,jj) ) * umask(ji,jj,jk)
zww(ji,jj,jk) = ( ( 1._wp - zfj) * zav / ( zbv - zeps ) &
& + zfj * zdepv * zslpml_hmlpv(ji,jj) ) * vmask(ji,jj,jk)
!!gm modif to suppress omlmask.... (as in Griffies case)
! ! ! jk must be >= ML level for zf=1. otherwise zf=0.
! zfi = REAL( 1 - 1/(1 + jk / MAX( nmln(ji+1,jj), nmln(ji,jj) ) ), wp )
! zfj = REAL( 1 - 1/(1 + jk / MAX( nmln(ji,jj+1), nmln(ji,jj) ) ), wp )
! zci = 0.5 * ( gdept(ji+1,jj,jk,Kmm)+gdept(ji,jj,jk,Kmm) ) / MAX( hmlpt(ji,jj), hmlpt(ji+1,jj), 10. ) )
! zcj = 0.5 * ( gdept(ji,jj+1,jk,Kmm)+gdept(ji,jj,jk,Kmm) ) / MAX( hmlpt(ji,jj), hmlpt(ji,jj+1), 10. ) )
! zwz(ji,jj,jk) = ( zfi * zai / ( zbi - zeps ) + ( 1._wp - zfi ) * wslpiml(ji,jj) * zci ) * tmask(ji,jj,jk)
! zww(ji,jj,jk) = ( zfj * zaj / ( zbj - zeps ) + ( 1._wp - zfj ) * wslpjml(ji,jj) * zcj ) * tmask(ji,jj,jk)
!!gm end modif
END_3D
CALL lbc_lnk( 'ldfslp', zwz, 'U', -1.0_wp, zww, 'V', -1.0_wp ) ! lateral boundary conditions
!
! !* horizontal Shapiro filter
DO jk = 2, jpkm1
DO_2D( 0, 0, 0, 0 ) ! rows jj=2 and =jpjm1 only
uslp(ji,jj,jk) = z1_16 * ( zwz(ji-1,jj-1,jk) + zwz(ji+1,jj-1,jk) &
& + zwz(ji-1,jj+1,jk) + zwz(ji+1,jj+1,jk) &
& + 2.*( zwz(ji ,jj-1,jk) + zwz(ji-1,jj ,jk) &
& + zwz(ji+1,jj ,jk) + zwz(ji ,jj+1,jk) ) &
& + 4.* zwz(ji ,jj ,jk) )
vslp(ji,jj,jk) = z1_16 * ( zww(ji-1,jj-1,jk) + zww(ji+1,jj-1,jk) &
& + zww(ji-1,jj+1,jk) + zww(ji+1,jj+1,jk) &
& + 2.*( zww(ji ,jj-1,jk) + zww(ji-1,jj ,jk) &
& + zww(ji+1,jj ,jk) + zww(ji ,jj+1,jk) ) &
& + 4.* zww(ji,jj ,jk) )
END_2D
! !* decrease along coastal boundaries
DO_2D( 0, 0, 0, 0 )
uslp(ji,jj,jk) = uslp(ji,jj,jk) * ( umask(ji,jj+1,jk) + umask(ji,jj-1,jk ) ) * 0.5_wp &
& * ( umask(ji,jj ,jk) + umask(ji,jj ,jk+1) ) * 0.5_wp
vslp(ji,jj,jk) = vslp(ji,jj,jk) * ( vmask(ji+1,jj,jk) + vmask(ji-1,jj,jk ) ) * 0.5_wp &
& * ( vmask(ji ,jj,jk) + vmask(ji ,jj,jk+1) ) * 0.5_wp
END_2D
END DO
! II. slopes at w point | wslpi = mij( d/di( prd ) / d/dz( prd )
! =========================== | wslpj = mij( d/dj( prd ) / d/dz( prd )
!
DO_3D( 0, 0, 0, 0, 2, jpkm1 )
! !* Local vertical density gradient evaluated from N^2
zbw = zm1_2g * pn2 (ji,jj,jk) * ( prd (ji,jj,jk) + prd (ji,jj,jk-1) + 2. )
! !* Slopes at w point
! ! i- & j-gradient of density at w-points
zci = MAX( umask(ji-1,jj,jk ) + umask(ji,jj,jk ) &
& + umask(ji-1,jj,jk-1) + umask(ji,jj,jk-1) , zeps ) * e1t(ji,jj)
zcj = MAX( vmask(ji,jj-1,jk ) + vmask(ji,jj,jk-1) &
& + vmask(ji,jj-1,jk-1) + vmask(ji,jj,jk ) , zeps ) * e2t(ji,jj)
zai = ( zgru (ji-1,jj,jk ) + zgru (ji,jj,jk-1) &
& + zgru (ji-1,jj,jk-1) + zgru (ji,jj,jk ) ) / zci * wmask (ji,jj,jk)
zaj = ( zgrv (ji,jj-1,jk ) + zgrv (ji,jj,jk-1) &
& + zgrv (ji,jj-1,jk-1) + zgrv (ji,jj,jk ) ) / zcj * wmask (ji,jj,jk)
! ! bound the slopes: abs(zw.)<= 1/100 and zb..<0.
! ! + kxz max= ah slope max =< e1 e3 /(pi**2 2 dt)
zbi = MIN( zbw ,- 100._wp* ABS( zai ) , -7.e+3_wp/e3w(ji,jj,jk,Kmm)* ABS( zai ) )
zbj = MIN( zbw , -100._wp* ABS( zaj ) , -7.e+3_wp/e3w(ji,jj,jk,Kmm)* ABS( zaj ) )
! ! wslpi and wslpj with ML flattening (output in zwz and zww, resp.)
zfk = MAX( omlmask(ji,jj,jk), omlmask(ji,jj,jk-1) ) ! zfk=1 in the ML otherwise zfk=0
zck = ( gdepw(ji,jj,jk,Kmm) - gdepw(ji,jj,mikt(ji,jj),Kmm) ) / MAX( hmlp(ji,jj) - gdepw(ji,jj,mikt(ji,jj),Kmm), 10._wp )
zwz(ji,jj,jk) = ( zai / ( zbi - zeps ) * ( 1._wp - zfk ) + zck * wslpiml(ji,jj) * zfk ) * wmask(ji,jj,jk)
zww(ji,jj,jk) = ( zaj / ( zbj - zeps ) * ( 1._wp - zfk ) + zck * wslpjml(ji,jj) * zfk ) * wmask(ji,jj,jk)
!!gm modif to suppress omlmask.... (as in Griffies operator)
! ! ! jk must be >= ML level for zfk=1. otherwise zfk=0.
! zfk = REAL( 1 - 1/(1 + jk / nmln(ji+1,jj)), wp )
! zck = gdepw(ji,jj,jk,Kmm) / MAX( hmlp(ji,jj), 10. )
! zwz(ji,jj,jk) = ( zfk * zai / ( zbi - zeps ) + ( 1._wp - zfk ) * wslpiml(ji,jj) * zck ) * tmask(ji,jj,jk)
! zww(ji,jj,jk) = ( zfk * zaj / ( zbj - zeps ) + ( 1._wp - zfk ) * wslpjml(ji,jj) * zck ) * tmask(ji,jj,jk)
!!gm end modif
END_3D
CALL lbc_lnk( 'ldfslp', zwz, 'T', -1.0_wp, zww, 'T', -1.0_wp ) ! lateral boundary conditions
!
! !* horizontal Shapiro filter
DO jk = 2, jpkm1
DO_2D( 0, 0, 0, 0 ) ! rows jj=2 and =jpjm1 only
zcofw = wmask(ji,jj,jk) * z1_16
wslpi(ji,jj,jk) = ( zwz(ji-1,jj-1,jk) + zwz(ji+1,jj-1,jk) &
& + zwz(ji-1,jj+1,jk) + zwz(ji+1,jj+1,jk) &
& + 2.*( zwz(ji ,jj-1,jk) + zwz(ji-1,jj ,jk) &
& + zwz(ji+1,jj ,jk) + zwz(ji ,jj+1,jk) ) &
& + 4.* zwz(ji ,jj ,jk) ) * zcofw
wslpj(ji,jj,jk) = ( zww(ji-1,jj-1,jk) + zww(ji+1,jj-1,jk) &
& + zww(ji-1,jj+1,jk) + zww(ji+1,jj+1,jk) &
& + 2.*( zww(ji ,jj-1,jk) + zww(ji-1,jj ,jk) &
& + zww(ji+1,jj ,jk) + zww(ji ,jj+1,jk) ) &
& + 4.* zww(ji ,jj ,jk) ) * zcofw
END_2D
! !* decrease in vicinity of topography
DO_2D( 0, 0, 0, 0 )
zck = ( umask(ji,jj,jk) + umask(ji-1,jj,jk) ) &
& * ( vmask(ji,jj,jk) + vmask(ji,jj-1,jk) ) * 0.25
wslpi(ji,jj,jk) = wslpi(ji,jj,jk) * zck
wslpj(ji,jj,jk) = wslpj(ji,jj,jk) * zck
END_2D
END DO
! IV. Lateral boundary conditions
! ===============================
CALL lbc_lnk( 'ldfslp', uslp , 'U', -1.0_wp , vslp , 'V', -1.0_wp , wslpi, 'W', -1.0_wp, wslpj, 'W', -1.0_wp )
IF(sn_cfctl%l_prtctl) THEN
CALL prt_ctl(tab3d_1=uslp , clinfo1=' slp - u : ', tab3d_2=vslp, clinfo2=' v : ')
CALL prt_ctl(tab3d_1=wslpi, clinfo1=' slp - wi: ', tab3d_2=wslpj, clinfo2=' wj: ')
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ENDIF
!
IF( ln_timing ) CALL timing_stop('ldf_slp')
!
END SUBROUTINE ldf_slp
SUBROUTINE ldf_slp_triad ( kt, Kbb, Kmm )
!!----------------------------------------------------------------------
!! *** ROUTINE ldf_slp_triad ***
!!
!! ** Purpose : Compute the squared slopes of neutral surfaces (slope
!! of iso-pycnal surfaces referenced locally) (ln_traldf_triad=T)
!! at W-points using the Griffies quarter-cells.
!!
!! ** Method : calculates alpha and beta at T-points
!!
!! ** Action : - triadi_g, triadj_g T-pts i- and j-slope triads relative to geopot. (used for eiv)
!! - triadi , triadj T-pts i- and j-slope triads relative to model-coordinate
!! - wslp2 squared slope of neutral surfaces at w-points.
!!----------------------------------------------------------------------
INTEGER, INTENT( in ) :: kt ! ocean time-step index
INTEGER , INTENT(in) :: Kbb, Kmm ! ocean time level indices
!!
INTEGER :: ji, jj, jk, jl, ip, jp, kp ! dummy loop indices
INTEGER :: iku, ikv ! local integer
REAL(wp) :: zfacti, zfactj ! local scalars
REAL(wp) :: znot_thru_surface ! local scalars
REAL(wp) :: zdit, zdis, zdkt, zbu, zbti, zisw
REAL(wp) :: zdjt, zdjs, zdks, zbv, zbtj, zjsw
REAL(wp) :: zdxrho_raw, zti_coord, zti_raw, zti_lim, zti_g_raw, zti_g_lim
REAL(wp) :: zdyrho_raw, ztj_coord, ztj_raw, ztj_lim, ztj_g_raw, ztj_g_lim
REAL(wp) :: zdzrho_raw
REAL(wp) :: zbeta0, ze3_e1, ze3_e2
REAL(wp), DIMENSION(jpi,jpj) :: z1_mlbw
REAL(wp), DIMENSION(jpi,jpj,jpk,0:1) :: zdxrho , zdyrho, zdzrho ! Horizontal and vertical density gradients
REAL(wp), DIMENSION(jpi,jpj,0:1,0:1) :: zti_mlb, ztj_mlb ! for Griffies operator only
!!----------------------------------------------------------------------
!
IF( ln_timing ) CALL timing_start('ldf_slp_triad')
!
!--------------------------------!
! Some preliminary calculation !
!--------------------------------!
!
DO jl = 0, 1 !== unmasked before density i- j-, k-gradients ==!
!
ip = jl ; jp = jl ! guaranteed nonzero gradients ( absolute value larger than repsln)
DO_3D( nn_hls, nn_hls-1, nn_hls, nn_hls-1, 1, jpkm1 ) ! done each pair of triad ! NB: not masked ==> a minimum value is set
zdit = ( ts(ji+1,jj,jk,jp_tem,Kbb) - ts(ji,jj,jk,jp_tem,Kbb) ) ! i-gradient of T & S at u-point
zdis = ( ts(ji+1,jj,jk,jp_sal,Kbb) - ts(ji,jj,jk,jp_sal,Kbb) )
zdjt = ( ts(ji,jj+1,jk,jp_tem,Kbb) - ts(ji,jj,jk,jp_tem,Kbb) ) ! j-gradient of T & S at v-point
zdjs = ( ts(ji,jj+1,jk,jp_sal,Kbb) - ts(ji,jj,jk,jp_sal,Kbb) )
zdxrho_raw = ( - rab_b(ji+ip,jj ,jk,jp_tem) * zdit + rab_b(ji+ip,jj ,jk,jp_sal) * zdis ) * r1_e1u(ji,jj)
zdyrho_raw = ( - rab_b(ji ,jj+jp,jk,jp_tem) * zdjt + rab_b(ji ,jj+jp,jk,jp_sal) * zdjs ) * r1_e2v(ji,jj)
zdxrho(ji+ip,jj ,jk,1-ip) = SIGN( MAX( repsln, ABS( zdxrho_raw ) ), zdxrho_raw ) ! keep the sign
zdyrho(ji ,jj+jp,jk,1-jp) = SIGN( MAX( repsln, ABS( zdyrho_raw ) ), zdyrho_raw )
END_3D
!
IF( ln_zps .AND. l_grad_zps ) THEN ! partial steps: correction of i- & j-grad on bottom
DO_2D( nn_hls, nn_hls-1, nn_hls, nn_hls-1 )
iku = mbku(ji,jj) ; ikv = mbkv(ji,jj) ! last ocean level (u- & v-points)
zdit = gtsu(ji,jj,jp_tem) ; zdjt = gtsv(ji,jj,jp_tem) ! i- & j-gradient of Temperature
zdis = gtsu(ji,jj,jp_sal) ; zdjs = gtsv(ji,jj,jp_sal) ! i- & j-gradient of Salinity
zdxrho_raw = ( - rab_b(ji+ip,jj ,iku,jp_tem) * zdit + rab_b(ji+ip,jj ,iku,jp_sal) * zdis ) * r1_e1u(ji,jj)
zdyrho_raw = ( - rab_b(ji ,jj+jp,ikv,jp_tem) * zdjt + rab_b(ji ,jj+jp,ikv,jp_sal) * zdjs ) * r1_e2v(ji,jj)
zdxrho(ji+ip,jj ,iku,1-ip) = SIGN( MAX( repsln, ABS( zdxrho_raw ) ), zdxrho_raw ) ! keep the sign
zdyrho(ji ,jj+jp,ikv,1-jp) = SIGN( MAX( repsln, ABS( zdyrho_raw ) ), zdyrho_raw )
END_2D
ENDIF
!
END DO
DO kp = 0, 1 !== unmasked before density i- j-, k-gradients ==!
DO_3D( nn_hls, nn_hls, nn_hls, nn_hls, 1, jpkm1 ) ! done each pair of triad ! NB: not masked ==> a minimum value is set
IF( jk+kp > 1 ) THEN ! k-gradient of T & S a jk+kp
zdkt = ( ts(ji,jj,jk+kp-1,jp_tem,Kbb) - ts(ji,jj,jk+kp,jp_tem,Kbb) )
zdks = ( ts(ji,jj,jk+kp-1,jp_sal,Kbb) - ts(ji,jj,jk+kp,jp_sal,Kbb) )
ELSE
zdkt = 0._wp ! 1st level gradient set to zero
zdks = 0._wp
ENDIF
zdzrho_raw = ( - rab_b(ji,jj,jk ,jp_tem) * zdkt &
& + rab_b(ji,jj,jk ,jp_sal) * zdks &
& ) / e3w(ji,jj,jk+kp,Kmm)
zdzrho(ji,jj,jk,kp) = - MIN( - repsln , zdzrho_raw ) ! force zdzrho >= repsln
END_3D
END DO
!
DO_2D( nn_hls, nn_hls, nn_hls, nn_hls ) !== Reciprocal depth of the w-point below ML base ==!
jk = MIN( nmln(ji,jj), mbkt(ji,jj) ) + 1 ! MIN in case ML depth is the ocean depth
z1_mlbw(ji,jj) = 1._wp / gdepw(ji,jj,jk,Kmm)
END_2D
!
! !== intialisations to zero ==!
!
wslp2 (:,:,:) = 0._wp ! wslp2 will be cumulated 3D field set to zero
triadi_g(:,:,1,:,:) = 0._wp ; triadi_g(:,:,jpk,:,:) = 0._wp ! set surface and bottom slope to zero
triadj_g(:,:,1,:,:) = 0._wp ; triadj_g(:,:,jpk,:,:) = 0._wp
!!gm _iso set to zero missing
triadi (:,:,1,:,:) = 0._wp ; triadj (:,:,jpk,:,:) = 0._wp ! set surface and bottom slope to zero
triadj (:,:,1,:,:) = 0._wp ; triadj (:,:,jpk,:,:) = 0._wp
!-------------------------------------!
! Triads just below the Mixed Layer !
!-------------------------------------!
!
DO jl = 0, 1 ! calculate slope of the 4 triads immediately ONE level below mixed-layer base
DO kp = 0, 1 ! with only the slope-max limit and MASKED
DO_2D( nn_hls, nn_hls-1, nn_hls, nn_hls-1 )
ip = jl ; jp = jl
!
jk = nmln(ji+ip,jj) + 1
IF( jk > mbkt(ji+ip,jj) ) THEN ! ML reaches bottom
zti_mlb(ji+ip,jj ,1-ip,kp) = 0.0_wp
ELSE
! Add s-coordinate slope at t-points (do this by *subtracting* gradient of depth)
zti_g_raw = ( zdxrho(ji+ip,jj,jk-kp,1-ip) / zdzrho(ji+ip,jj,jk-kp,kp) &
& - ( gdept(ji+1,jj,jk-kp,Kmm) - gdept(ji,jj,jk-kp,Kmm) ) * r1_e1u(ji,jj) ) * umask(ji,jj,jk)
ze3_e1 = e3w(ji+ip,jj,jk-kp,Kmm) * r1_e1u(ji,jj)
zti_mlb(ji+ip,jj ,1-ip,kp) = SIGN( MIN( rn_slpmax, 5.0_wp * ze3_e1 , ABS( zti_g_raw ) ), zti_g_raw )
ENDIF
!
jk = nmln(ji,jj+jp) + 1
IF( jk > mbkt(ji,jj+jp) ) THEN !ML reaches bottom
ztj_mlb(ji ,jj+jp,1-jp,kp) = 0.0_wp
ELSE
ztj_g_raw = ( zdyrho(ji,jj+jp,jk-kp,1-jp) / zdzrho(ji,jj+jp,jk-kp,kp) &
& - ( gdept(ji,jj+1,jk-kp,Kmm) - gdept(ji,jj,jk-kp,Kmm) ) / e2v(ji,jj) ) * vmask(ji,jj,jk)
ze3_e2 = e3w(ji,jj+jp,jk-kp,Kmm) / e2v(ji,jj)
ztj_mlb(ji ,jj+jp,1-jp,kp) = SIGN( MIN( rn_slpmax, 5.0_wp * ze3_e2 , ABS( ztj_g_raw ) ), ztj_g_raw )
ENDIF
END_2D
END DO
END DO
!-------------------------------------!
! Triads with surface limits !
!-------------------------------------!
!
DO kp = 0, 1 ! k-index of triads
DO jl = 0, 1
ip = jl ; jp = jl ! i- and j-indices of triads (i-k and j-k planes)
DO jk = 1, jpkm1
! Must mask contribution to slope from dz/dx at constant s for triads jk=1,kp=0 that poke up though ocean surface
znot_thru_surface = REAL( 1-1/(jk+kp), wp ) !jk+kp=1,=0.; otherwise=1.0
DO_2D( nn_hls, nn_hls-1, nn_hls, nn_hls-1 )
!
! Calculate slope relative to geopotentials used for GM skew fluxes
! Add s-coordinate slope at t-points (do this by *subtracting* gradient of depth)
! Limit by slope *relative to geopotentials* by rn_slpmax, and mask by psi-point
! masked by umask taken at the level of dz(rho)
!
! raw slopes: unmasked unbounded slopes (relative to geopotential (zti_g) and model surface (zti)
!
zti_raw = zdxrho(ji+ip,jj ,jk,1-ip) / zdzrho(ji+ip,jj ,jk,kp) ! unmasked
ztj_raw = zdyrho(ji ,jj+jp,jk,1-jp) / zdzrho(ji ,jj+jp,jk,kp)
!
! Must mask contribution to slope for triad jk=1,kp=0 that poke up though ocean surface
zti_coord = znot_thru_surface * ( gdept(ji+1,jj ,jk,Kmm) - gdept(ji,jj,jk,Kmm) ) * r1_e1u(ji,jj)
ztj_coord = znot_thru_surface * ( gdept(ji ,jj+1,jk,Kmm) - gdept(ji,jj,jk,Kmm) ) * r1_e2v(ji,jj) ! unmasked
zti_g_raw = zti_raw - zti_coord ! ref to geopot surfaces
ztj_g_raw = ztj_raw - ztj_coord
! additional limit required in bilaplacian case
ze3_e1 = e3w(ji+ip,jj ,jk+kp,Kmm) * r1_e1u(ji,jj)
ze3_e2 = e3w(ji ,jj+jp,jk+kp,Kmm) * r1_e2v(ji,jj)
! NB: hard coded factor 5 (can be a namelist parameter...)
zti_g_lim = SIGN( MIN( rn_slpmax, 5.0_wp * ze3_e1, ABS( zti_g_raw ) ), zti_g_raw )
ztj_g_lim = SIGN( MIN( rn_slpmax, 5.0_wp * ze3_e2, ABS( ztj_g_raw ) ), ztj_g_raw )
!
! Below ML use limited zti_g as is & mask
! Inside ML replace by linearly reducing sx_mlb towards surface & mask
!
zfacti = REAL( 1 - 1/(1 + (jk+kp-1)/nmln(ji+ip,jj)), wp ) ! k index of uppermost point(s) of triad is jk+kp-1
zfactj = REAL( 1 - 1/(1 + (jk+kp-1)/nmln(ji,jj+jp)), wp ) ! must be .ge. nmln(ji,jj) for zfact=1
! ! otherwise zfact=0
zti_g_lim = ( zfacti * zti_g_lim &
& + ( 1._wp - zfacti ) * zti_mlb(ji+ip,jj,1-ip,kp) &
& * gdepw(ji+ip,jj,jk+kp,Kmm) * z1_mlbw(ji+ip,jj) ) * umask(ji,jj,jk+kp)
ztj_g_lim = ( zfactj * ztj_g_lim &
& + ( 1._wp - zfactj ) * ztj_mlb(ji,jj+jp,1-jp,kp) &
& * gdepw(ji,jj+jp,jk+kp,Kmm) * z1_mlbw(ji,jj+jp) ) * vmask(ji,jj,jk+kp)
!
triadi_g(ji+ip,jj ,jk,1-ip,kp) = zti_g_lim
triadj_g(ji ,jj+jp,jk,1-jp,kp) = ztj_g_lim
!
! Get coefficients of isoneutral diffusion tensor
! 1. Utilise gradients *relative* to s-coordinate, so add t-point slopes (*subtract* depth gradients)
! 2. We require that isoneutral diffusion gives no vertical buoyancy flux
! i.e. 33 term = (real slope* 31, 13 terms)
! To do this, retain limited sx**2 in vertical flux, but divide by real slope for 13/31 terms
! Equivalent to tapering A_iso = sx_limited**2/(real slope)**2
!
zti_lim = ( zti_g_lim + zti_coord ) * umask(ji,jj,jk+kp) ! remove coordinate slope => relative to coordinate surfaces
ztj_lim = ( ztj_g_lim + ztj_coord ) * vmask(ji,jj,jk+kp)
!
IF( ln_triad_iso ) THEN
zti_raw = zti_lim*zti_lim / zti_raw
ztj_raw = ztj_lim*ztj_lim / ztj_raw
zti_raw = SIGN( MIN( ABS(zti_lim), ABS( zti_raw ) ), zti_raw )
ztj_raw = SIGN( MIN( ABS(ztj_lim), ABS( ztj_raw ) ), ztj_raw )
zti_lim = zfacti * zti_lim + ( 1._wp - zfacti ) * zti_raw
ztj_lim = zfactj * ztj_lim + ( 1._wp - zfactj ) * ztj_raw
ENDIF
! ! switching triad scheme
zisw = (1._wp - rn_sw_triad ) + rn_sw_triad &
& * 2._wp * ABS( 0.5_wp - kp - ( 0.5_wp - ip ) * SIGN( 1._wp , zdxrho(ji+ip,jj,jk,1-ip) ) )
zjsw = (1._wp - rn_sw_triad ) + rn_sw_triad &
& * 2._wp * ABS( 0.5_wp - kp - ( 0.5_wp - jp ) * SIGN( 1._wp , zdyrho(ji,jj+jp,jk,1-jp) ) )
!
triadi(ji+ip,jj ,jk,1-ip,kp) = zti_lim * zisw
triadj(ji ,jj+jp,jk,1-jp,kp) = ztj_lim * zjsw
!
zbu = e1e2u(ji ,jj ) * e3u(ji ,jj ,jk ,Kmm)
zbv = e1e2v(ji ,jj ) * e3v(ji ,jj ,jk ,Kmm)
zbti = e1e2t(ji+ip,jj ) * e3w(ji+ip,jj ,jk+kp,Kmm)
zbtj = e1e2t(ji ,jj+jp) * e3w(ji ,jj+jp,jk+kp,Kmm)
!
wslp2(ji+ip,jj,jk+kp) = wslp2(ji+ip,jj,jk+kp) + 0.25_wp * zbu / zbti * zti_g_lim*zti_g_lim ! masked
wslp2(ji,jj+jp,jk+kp) = wslp2(ji,jj+jp,jk+kp) + 0.25_wp * zbv / zbtj * ztj_g_lim*ztj_g_lim
END_2D
END DO
END DO
END DO
!
wslp2(:,:,1) = 0._wp ! force the surface wslp to zero
CALL lbc_lnk( 'ldfslp', wslp2, 'W', 1.0_wp ) ! lateral boundary confition on wslp2 only ==>>> gm : necessary ? to be checked
!
IF( ln_timing ) CALL timing_stop('ldf_slp_triad')
!
END SUBROUTINE ldf_slp_triad
SUBROUTINE ldf_slp_mxl( prd, pn2, p_gru, p_grv, p_dzr, Kmm )
!!----------------------------------------------------------------------
!! *** ROUTINE ldf_slp_mxl ***
!!
!! ** Purpose : Compute the slopes of iso-neutral surface just below
!! the mixed layer.
!!
!! ** Method : The slope in the i-direction is computed at u- & w-points
!! (uslpml, wslpiml) and the slope in the j-direction is computed
!! at v- and w-points (vslpml, wslpjml) with the same bounds as
!! in ldf_slp.
!!
!! ** Action : uslpml, wslpiml : i- & j-slopes of neutral surfaces
!! vslpml, wslpjml just below the mixed layer
!! omlmask : mixed layer mask
!!----------------------------------------------------------------------
REAL(wp), DIMENSION(:,:,:), INTENT(in) :: prd ! in situ density
REAL(wp), DIMENSION(:,:,:), INTENT(in) :: pn2 ! Brunt-Vaisala frequency (locally ref.)
REAL(wp), DIMENSION(:,:,:), INTENT(in) :: p_gru, p_grv ! i- & j-gradient of density (u- & v-pts)
REAL(wp), DIMENSION(:,:,:), INTENT(in) :: p_dzr ! z-gradient of density (T-point)
INTEGER , INTENT(in) :: Kmm ! ocean time level indices
!!
INTEGER :: ji , jj , jk ! dummy loop indices
INTEGER :: iku, ikv, ik, ikm1 ! local integers
REAL(wp) :: zeps, zm1_g, zm1_2g, z1_slpmax ! local scalars
REAL(wp) :: zci, zfi, zau, zbu, zai, zbi ! - -
REAL(wp) :: zcj, zfj, zav, zbv, zaj, zbj ! - -
REAL(wp) :: zck, zfk, zbw ! - -
!!----------------------------------------------------------------------
!
zeps = 1.e-20_wp !== Local constant initialization ==!
zm1_g = -1.0_wp / grav
zm1_2g = -0.5_wp / grav
z1_slpmax = 1._wp / rn_slpmax
!
! !== surface mixed layer mask !
DO_3D( 1, 1, 1, 1, 1, jpk ) ! =1 inside the mixed layer, =0 otherwise
ik = nmln(ji,jj) - 1
IF( jk <= ik ) THEN ; omlmask(ji,jj,jk) = 1._wp
ELSE ; omlmask(ji,jj,jk) = 0._wp
ENDIF
END_3D
! Slopes of isopycnal surfaces just before bottom of mixed layer
! --------------------------------------------------------------
! The slope are computed as in the 3D case.
! A key point here is the definition of the mixed layer at u- and v-points.
! It is assumed to be the maximum of the two neighbouring T-point mixed layer depth.
! Otherwise, a n2 value inside the mixed layer can be involved in the computation
! of the slope, resulting in a too steep diagnosed slope and thus a spurious eddy
! induce velocity field near the base of the mixed layer.
!-----------------------------------------------------------------------
!
DO_2D( 0, 0, 0, 0 )
! !== Slope at u- & v-points just below the Mixed Layer ==!
!
! !- vertical density gradient for u- and v-slopes (from dzr at T-point)
iku = MIN( MAX( 1, nmln(ji,jj) , nmln(ji+1,jj) ) , jpkm1 ) ! ML (MAX of T-pts, bound by jpkm1)
ikv = MIN( MAX( 1, nmln(ji,jj) , nmln(ji,jj+1) ) , jpkm1 ) !
zbu = 0.5_wp * ( p_dzr(ji,jj,iku) + p_dzr(ji+1,jj ,iku) )
zbv = 0.5_wp * ( p_dzr(ji,jj,ikv) + p_dzr(ji ,jj+1,ikv) )
! !- horizontal density gradient at u- & v-points
zau = p_gru(ji,jj,iku) * r1_e1u(ji,jj)
zav = p_grv(ji,jj,ikv) * r1_e2v(ji,jj)
! !- bound the slopes: abs(zw.)<= 1/100 and zb..<0
! kxz max= ah slope max =< e1 e3 /(pi**2 2 dt)
zbu = MIN( zbu , - z1_slpmax * ABS( zau ) , -7.e+3_wp/e3u(ji,jj,iku,Kmm)* ABS( zau ) )
zbv = MIN( zbv , - z1_slpmax * ABS( zav ) , -7.e+3_wp/e3v(ji,jj,ikv,Kmm)* ABS( zav ) )
! !- Slope at u- & v-points (uslpml, vslpml)
uslpml(ji,jj) = zau / ( zbu - zeps ) * umask(ji,jj,iku)
vslpml(ji,jj) = zav / ( zbv - zeps ) * vmask(ji,jj,ikv)
!
! !== i- & j-slopes at w-points just below the Mixed Layer ==!
!
ik = MIN( nmln(ji,jj) + 1, jpk )
ikm1 = MAX( 1, ik-1 )
! !- vertical density gradient for w-slope (from N^2)
zbw = zm1_2g * pn2 (ji,jj,ik) * ( prd (ji,jj,ik) + prd (ji,jj,ikm1) + 2. )
! !- horizontal density i- & j-gradient at w-points
zci = MAX( umask(ji-1,jj,ik ) + umask(ji,jj,ik ) &
& + umask(ji-1,jj,ikm1) + umask(ji,jj,ikm1) , zeps ) * e1t(ji,jj)
zcj = MAX( vmask(ji,jj-1,ik ) + vmask(ji,jj,ik ) &
& + vmask(ji,jj-1,ikm1) + vmask(ji,jj,ikm1) , zeps ) * e2t(ji,jj)
zai = ( p_gru(ji-1,jj,ik ) + p_gru(ji,jj,ik) &
& + p_gru(ji-1,jj,ikm1) + p_gru(ji,jj,ikm1 ) ) / zci * tmask(ji,jj,ik)
zaj = ( p_grv(ji,jj-1,ik ) + p_grv(ji,jj,ik ) &
& + p_grv(ji,jj-1,ikm1) + p_grv(ji,jj,ikm1) ) / zcj * tmask(ji,jj,ik)
! !- bound the slopes: abs(zw.)<= 1/100 and zb..<0.
! kxz max= ah slope max =< e1 e3 /(pi**2 2 dt)
zbi = MIN( zbw , -100._wp* ABS( zai ) , -7.e+3_wp/e3w(ji,jj,ik,Kmm)* ABS( zai ) )
zbj = MIN( zbw , -100._wp* ABS( zaj ) , -7.e+3_wp/e3w(ji,jj,ik,Kmm)* ABS( zaj ) )
! !- i- & j-slope at w-points (wslpiml, wslpjml)
wslpiml(ji,jj) = zai / ( zbi - zeps ) * tmask (ji,jj,ik)
wslpjml(ji,jj) = zaj / ( zbj - zeps ) * tmask (ji,jj,ik)
END_2D
!
END SUBROUTINE ldf_slp_mxl
SUBROUTINE ldf_slp_init
!!----------------------------------------------------------------------
!! *** ROUTINE ldf_slp_init ***
!!
!! ** Purpose : Initialization for the isopycnal slopes computation
!!
!! ** Method :
!!----------------------------------------------------------------------
INTEGER :: ji, jj, jk ! dummy loop indices
INTEGER :: ierr ! local integer
!!----------------------------------------------------------------------
!
IF(lwp) THEN
WRITE(numout,*)
WRITE(numout,*) 'ldf_slp_init : direction of lateral mixing'
WRITE(numout,*) '~~~~~~~~~~~~'
ENDIF
!
ALLOCATE( ah_wslp2(jpi,jpj,jpk) , akz(jpi,jpj,jpk) , STAT=ierr )
IF( ierr > 0 ) CALL ctl_stop( 'STOP', 'ldf_slp_init : unable to allocate ah_slp2 or akz' )
!
Guillaume Samson
committed
DO_3D( nn_hls-1, nn_hls-1, nn_hls-1, nn_hls-1, 1, jpk )
akz (ji,jj,jk) = 0._wp
ah_wslp2(ji,jj,jk) = 0._wp
END_3D
!
IF( ln_traldf_triad ) THEN ! Griffies operator : triad of slopes
IF(lwp) WRITE(numout,*) ' ==>>> triad) operator (Griffies)'
ALLOCATE( triadi_g(jpi,jpj,jpk,0:1,0:1) , triadj_g(jpi,jpj,jpk,0:1,0:1) , &
& triadi (jpi,jpj,jpk,0:1,0:1) , triadj (jpi,jpj,jpk,0:1,0:1) , &
& wslp2 (jpi,jpj,jpk) , STAT=ierr )
IF( ierr > 0 ) CALL ctl_stop( 'STOP', 'ldf_slp_init : unable to allocate Griffies operator slope' )
IF( ln_dynldf_iso ) CALL ctl_stop( 'ldf_slp_init: Griffies operator on momentum not supported' )
!
ELSE ! Madec operator : slopes at u-, v-, and w-points
IF(lwp) WRITE(numout,*) ' ==>>> iso operator (Madec)'
ALLOCATE( omlmask(jpi,jpj,jpk) , &
& uslp(jpi,jpj,jpk) , uslpml(A2D(0)) , wslpi(jpi,jpj,jpk) , wslpiml(A2D(0)) , &
& vslp(jpi,jpj,jpk) , vslpml(A2D(0)) , wslpj(jpi,jpj,jpk) , wslpjml(A2D(0)) , STAT=ierr )
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IF( ierr > 0 ) CALL ctl_stop( 'STOP', 'ldf_slp_init : unable to allocate Madec operator slope ' )
! Direction of lateral diffusion (tracers and/or momentum)
! ------------------------------
uslp (:,:,:) = 0._wp ; uslpml (:,:) = 0._wp ! set the slope to zero (even in s-coordinates)
vslp (:,:,:) = 0._wp ; vslpml (:,:) = 0._wp
wslpi(:,:,:) = 0._wp ; wslpiml(:,:) = 0._wp
wslpj(:,:,:) = 0._wp ; wslpjml(:,:) = 0._wp
!!gm I no longer understand this.....
!!gm IF( (ln_traldf_hor .OR. ln_dynldf_hor) .AND. .NOT. (.NOT.ln_linssh .AND. ln_rstart) ) THEN
! IF(lwp) WRITE(numout,*) ' Horizontal mixing in s-coordinate: slope = slope of s-surfaces'
!
! ! geopotential diffusion in s-coordinates on tracers and/or momentum
! ! The slopes of s-surfaces are computed once (no call to ldfslp in step)
! ! The slopes for momentum diffusion are i- or j- averaged of those on tracers
!
! ! set the slope of diffusion to the slope of s-surfaces
! ! ( c a u t i o n : minus sign as dep has positive value )
! DO jk = 1, jpk
! DO jj = 2, jpjm1
! DO ji = 2, jpim1 ! vector opt.
! uslp (ji,jj,jk) = - ( gdept(ji+1,jj,jk,Kmm) - gdept(ji ,jj ,jk,Kmm) ) * r1_e1u(ji,jj) * umask(ji,jj,jk)
! vslp (ji,jj,jk) = - ( gdept(ji,jj+1,jk,Kmm) - gdept(ji ,jj ,jk,Kmm) ) * r1_e2v(ji,jj) * vmask(ji,jj,jk)
! wslpi(ji,jj,jk) = - ( gdepw(ji+1,jj,jk,Kmm) - gdepw(ji-1,jj,jk,Kmm) ) * r1_e1t(ji,jj) * wmask(ji,jj,jk) * 0.5
! wslpj(ji,jj,jk) = - ( gdepw(ji,jj+1,jk,Kmm) - gdepw(ji,jj-1,jk,Kmm) ) * r1_e2t(ji,jj) * wmask(ji,jj,jk) * 0.5
! END DO
! END DO
! END DO
! CALL lbc_lnk( 'ldfslp', uslp , 'U', -1. ; CALL lbc_lnk( 'ldfslp', vslp , 'V', -1., wslpi, 'W', -1., wslpj, 'W', -1. )
!!gm ENDIF
ENDIF
!
END SUBROUTINE ldf_slp_init
!!======================================================================
END MODULE ldfslp