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 dom_oce ! 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 USE wrk_nemo ! work arrays USE timing ! Timing USE trc_oce, ONLY : lk_offline ! offline flag IMPLICIT NONE PRIVATE PUBLIC zdf_mxl ! called by step.F90 INTEGER , PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: nmln !: number of level in the mixed layer (used by TOP) REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmld !: mixing layer depth (turbocline) [m] REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlp !: mixed layer depth (rho=rho0+zdcrit) [m] REAL(wp), PUBLIC, ALLOCATABLE, SAVE, DIMENSION(:,:) :: hmlpt !: mixed layer depth at t-points [m] REAL(wp), PUBLIC :: rho_c = 0.01_wp !: density criterion for mixed layer depth REAL(wp) :: avt_c = 5.e-4_wp ! Kz criterion for the turbocline depth !! * Substitutions # include "domzgr_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 4.0 , NEMO Consortium (2011) !! $Id$ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- 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( nmln(jpi,jpj), hmld(jpi,jpj), hmlp(jpi,jpj), hmlpt(jpi,jpj), STAT= zdf_mxl_alloc ) ! IF( lk_mpp ) CALL mpp_sum ( zdf_mxl_alloc ) IF( zdf_mxl_alloc /= 0 ) CALL ctl_warn('zdf_mxl_alloc: failed to allocate arrays.') ! ENDIF END FUNCTION zdf_mxl_alloc SUBROUTINE zdf_mxl( kt ) !!---------------------------------------------------------------------- !! *** ROUTINE zdfmxl *** !! !! ** Purpose : Compute the turbocline depth and 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 !! 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 : nmln, hmld, hmlp, hmlpt !!---------------------------------------------------------------------- INTEGER, INTENT(in) :: kt ! ocean time-step index ! INTEGER :: ji, jj, jk ! dummy loop indices INTEGER :: iikn, iiki, ikt, imkt ! local integer REAL(wp) :: zN2_c ! local scalar INTEGER, POINTER, DIMENSION(:,:) :: imld ! 2D workspace !!---------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('zdf_mxl') ! CALL wrk_alloc( jpi,jpj, imld ) IF( kt == nit000 ) THEN IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'zdf_mxl : mixed layer depth' IF(lwp) WRITE(numout,*) '~~~~~~~ ' ! ! allocate zdfmxl arrays IF( zdf_mxl_alloc() /= 0 ) CALL ctl_stop( 'STOP', 'zdf_mxl : unable to allocate arrays' ) ENDIF ! w-level of the mixing and mixed layers nmln(:,:) = nlb10 ! Initialization to the number of w ocean point hmlp(:,:) = 0._wp ! here hmlp used as a dummy variable, integrating vertically N^2 zN2_c = grav * rho_c * r1_rau0 ! convert density criteria into N^2 criteria DO jk = nlb10, jpkm1 DO jj = 1, jpj ! Mixed layer level: w-level DO ji = 1, jpi ikt = mbkt(ji,jj) hmlp(ji,jj) = hmlp(ji,jj) + MAX( rn2b(ji,jj,jk) , 0._wp ) * fse3w(ji,jj,jk) IF( hmlp(ji,jj) < zN2_c ) nmln(ji,jj) = MIN( jk , ikt ) + 1 ! Mixed layer level END DO END DO END DO ! ! w-level of the turbocline imld(:,:) = mbkt(:,:) + 1 ! Initialization to the number of w ocean point DO jk = jpkm1, nlb10, -1 ! from the bottom to nlb10 DO jj = 1, jpj DO ji = 1, jpi imkt = mikt(ji,jj) IF( avt (ji,jj,jk) < avt_c ) imld(ji,jj) = MAX( imkt, jk ) ! Turbocline END DO END DO END DO ! depth of the mixing and mixed layers DO jj = 1, jpj DO ji = 1, jpi iiki = imld(ji,jj) iikn = nmln(ji,jj) imkt = mikt(ji,jj) hmld (ji,jj) = ( fsdepw(ji,jj,iiki ) - fsdepw(ji,jj,imkt ) ) * ssmask(ji,jj) ! Turbocline depth hmlp (ji,jj) = ( fsdepw(ji,jj,iikn ) - fsdepw(ji,jj,MAX( imkt,nla10 ) ) ) * ssmask(ji,jj) ! Mixed layer depth hmlpt(ji,jj) = ( fsdept(ji,jj,iikn-1) - fsdepw(ji,jj,imkt ) ) * ssmask(ji,jj) ! depth of the last T-point inside the mixed layer END DO END DO IF( .NOT.lk_offline ) THEN ! no need to output in offline mode CALL iom_put( "mldr10_1", hmlp ) ! mixed layer depth CALL iom_put( "mldkz5" , hmld ) ! turbocline depth ENDIF IF(ln_ctl) CALL prt_ctl( tab2d_1=REAL(nmln,wp), clinfo1=' nmln : ', tab2d_2=hmlp, clinfo2=' hmlp : ', ovlap=1 ) ! CALL wrk_dealloc( jpi,jpj, imld ) ! IF( nn_timing == 1 ) CALL timing_stop('zdf_mxl') ! END SUBROUTINE zdf_mxl !!====================================================================== END MODULE zdfmxl