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zdfmxl.F90 8.15 KiB
MODULE zdfmxl
!!======================================================================
!! *** MODULE zdfmxl ***
!! Ocean physics: mixed layer depth
!!======================================================================
!! History : 1.0 ! 2003-08 (G. Madec) original code
!! 3.2 ! 2009-07 (S. Masson, G. Madec) IOM + merge of DO-loop
!! 3.7 ! 2012-03 (G. Madec) make public the density criteria for trdmxl
!! - ! 2014-02 (F. Roquet) mixed layer depth calculated using N2 instead of rhop
!!----------------------------------------------------------------------
!! zdf_mxl : Compute the turbocline and mixed layer depths.
!!----------------------------------------------------------------------
USE oce ! ocean dynamics and tracers variables
USE isf_oce ! ice shelf
USE dom_oce ! ocean space and time domain variables
USE trc_oce , ONLY: l_offline ! ocean space and time domain variables
USE zdf_oce ! ocean vertical physics
!
USE in_out_manager ! I/O manager
USE prtctl ! Print control
USE phycst ! physical constants
USE iom ! I/O library
USE lib_mpp ! MPP library
IMPLICIT NONE
PRIVATE
PUBLIC zdf_mxl, zdf_mxl_turb, zdf_mxl_alloc ! called by zdfphy.F90
INTEGER , PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: nmln !: number of level in the mixed layer (used by LDF, ZDF, TRD, TOP)
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld !: mixing layer depth (turbocline) [m] (used by TOP)
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] (used by LDF)
REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: depth of the last T-point inside the mixed layer [m] (used by LDF)
REAL(wp), PUBLIC :: rho_c = 0.01_wp !: density criterion for mixed layer depth
REAL(wp), PUBLIC :: avt_c = 5.e-4_wp ! Kz criterion for the turbocline depth
!! * Substitutions
# include "do_loop_substitute.h90"
# include "domzgr_substitute.h90"
!!----------------------------------------------------------------------
!! NEMO/OCE 4.0 , NEMO Consortium (2018)
!! $Id: zdfmxl.F90 15249 2021-09-13 09:59:09Z hadcv $
!! Software governed by the CeCILL license (see ./LICENSE)
!!----------------------------------------------------------------------
CONTAINS
INTEGER FUNCTION zdf_mxl_alloc()
!!----------------------------------------------------------------------
!! *** FUNCTION zdf_mxl_alloc ***
!!----------------------------------------------------------------------
zdf_mxl_alloc = 0 ! set to zero if no array to be allocated
IF( .NOT. ALLOCATED( nmln ) ) THEN
ALLOCATE( hmld(A2D(0)), nmln(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), STAT= zdf_mxl_alloc )
!
CALL mpp_sum ( 'zdfmxl', zdf_mxl_alloc )
IF( zdf_mxl_alloc /= 0 ) CALL ctl_stop( 'STOP', 'zdf_mxl_alloc: failed to allocate arrays.' )
!
ENDIF
END FUNCTION zdf_mxl_alloc
SUBROUTINE zdf_mxl( kt, Kmm )
!!----------------------------------------------------------------------
!! *** ROUTINE zdfmxl ***
!!
!! ** Purpose : Compute the mixed layer depth with density criteria.
!!
!! ** Method : The mixed layer depth is the shallowest W depth with
!! the density of the corresponding T point (just bellow) bellow a !! given value defined locally as rho(10m) + rho_c
!!
!! ** Action : nmln, hmlp, hmlpt
!!----------------------------------------------------------------------
INTEGER, INTENT(in) :: kt ! ocean time-step index
INTEGER, INTENT(in) :: Kmm ! ocean time level index
!
INTEGER :: ji, jj, jk ! dummy loop indices
INTEGER :: iik, ikt ! local integer
REAL(wp) :: zN2_c ! local scalar
!!----------------------------------------------------------------------
!
IF( .NOT. l_istiled .OR. ntile == 1 ) THEN ! Do only on the first tile
IF( kt == nit000 ) THEN
IF(lwp) WRITE(numout,*)
IF(lwp) WRITE(numout,*) 'zdf_mxl : mixed layer depth'
IF(lwp) WRITE(numout,*) '~~~~~~~ '
ENDIF
ENDIF
!
! w-level of the mixing and mixed layers
DO_2D_OVR( nn_hls, nn_hls, nn_hls, nn_hls )
nmln(ji,jj) = nlb10 ! Initialization to the number of w ocean point
hmlp(ji,jj) = 0._wp ! here hmlp used as a dummy variable, integrating vertically N^2
END_2D
zN2_c = grav * rho_c * r1_rho0 ! convert density criteria into N^2 criteria
DO_3D_OVR( nn_hls, nn_hls, nn_hls, nn_hls, nlb10, jpkm1 ) ! Mixed layer level: w-level
ikt = mbkt(ji,jj)
hmlp(ji,jj) = &
& hmlp(ji,jj) + MAX( rn2b(ji,jj,jk) , 0._wp ) * e3w(ji,jj,jk,Kmm)
IF( hmlp(ji,jj) < zN2_c ) nmln(ji,jj) = MIN( jk , ikt ) + 1 ! Mixed layer level
END_3D
! depth of the mixed layer
DO_2D_OVR( nn_hls, nn_hls, nn_hls, nn_hls )
iik = nmln(ji,jj)
hmlp (ji,jj) = gdepw(ji,jj,iik ,Kmm) * ssmask(ji,jj) ! Mixed layer depth
hmlpt(ji,jj) = gdept(ji,jj,iik-1,Kmm) * ssmask(ji,jj) ! depth of the last T-point inside the mixed layer
END_2D
!
IF( .NOT.l_offline .AND. iom_use("mldr10_1") ) THEN
IF( .NOT. l_istiled .OR. ntile == nijtile ) THEN ! Do only on the last tile
IF( ln_isfcav ) THEN ; CALL iom_put( "mldr10_1", hmlp(A2D(0)) - risfdep(A2D(0))) ! mixed layer thickness
ELSE ; CALL iom_put( "mldr10_1", hmlp(A2D(0)) ) ! mixed layer depth
END IF
ENDIF
ENDIF
!
IF(sn_cfctl%l_prtctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ' )
!
END SUBROUTINE zdf_mxl
SUBROUTINE zdf_mxl_turb( kt, Kmm )
!!----------------------------------------------------------------------
!! *** ROUTINE zdf_mxl_turb ***
!!
!! ** Purpose : Compute the turbocline depth.
!!
!! ** Method : The turbocline depth is the depth at which the vertical
!! eddy diffusivity coefficient (resulting from the vertical physics
!! alone, not the isopycnal part, see trazdf.F) fall below a given
!! value defined locally (avt_c here taken equal to 5 cm/s2 by default)
!!
!! ** Action : hmld
!!----------------------------------------------------------------------
INTEGER, INTENT(in) :: kt ! ocean time-step index
INTEGER, INTENT(in) :: Kmm ! ocean time level index
!
INTEGER :: ji, jj, jk ! dummy loop indices
INTEGER :: iik ! local integer INTEGER, DIMENSION(A2D(0)) :: imld ! 2D workspace
!!----------------------------------------------------------------------
!
! w-level of the turbocline and mixing layer (iom_use)
imld(:,:) = mbkt(A2D(0)) + 1 ! Initialization to the number of w ocean point
DO_3DS( 0, 0, 0, 0, jpkm1, nlb10, -1 ) ! from the bottom to nlb10
IF( avt (ji,jj,jk) < avt_c * wmask(ji,jj,jk) ) imld(ji,jj) = jk ! Turbocline
END_3D
! depth of the mixing layer
DO_2D_OVR( 0, 0, 0, 0 )
iik = imld(ji,jj)
hmld (ji,jj) = gdepw(ji,jj,iik ,Kmm) * ssmask(ji,jj) ! Turbocline depth
END_2D
!
IF( .NOT.l_offline .AND. iom_use("mldkz5") ) THEN
IF( .NOT. l_istiled .OR. ntile == nijtile ) THEN ! Do only on the last tile
IF( ln_isfcav ) THEN ; CALL iom_put( "mldkz5" , hmld - risfdep(A2D(0)) ) ! turbocline thickness
ELSE ; CALL iom_put( "mldkz5" , hmld ) ! turbocline depth
END IF
ENDIF
ENDIF
!
END SUBROUTINE zdf_mxl_turb
!!======================================================================
END MODULE zdfmxl