MODULE zdfevd !!====================================================================== !! *** MODULE zdfevd *** !! Ocean physics: parameterization of convection through an enhancement !! of vertical eddy mixing coefficient !!====================================================================== !! History : OPA ! 1997-06 (G. Madec, A. Lazar) Original code !! NEMO 1.0 ! 2002-06 (G. Madec) F90: Free form and module !! 3.2 ! 2009-03 (M. Leclair, G. Madec, R. Benshila) test on both before & after !! 4.0 ! 2017-04 (G. Madec) evd applied on avm (at t-point) !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! zdf_evd : increase the momentum and tracer Kz at the location of !! statically unstable portion of the water column (ln_zdfevd=T) !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers variables USE dom_oce ! ocean space and time domain variables USE zdf_oce ! ocean vertical physics variables USE trd_oce ! trends: ocean variables USE trdtra ! trends manager: tracers ! USE in_out_manager ! I/O manager USE iom ! for iom_put USE lbclnk ! ocean lateral boundary conditions (or mpp link) USE timing ! Timing IMPLICIT NONE PRIVATE PUBLIC zdf_evd ! called by step.F90 !!---------------------------------------------------------------------- !! NEMO/OCE 4.0 , NEMO Consortium (2018) !! $Id$ !! Software governed by the CeCILL license (see ./LICENSE) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE zdf_evd( kt, p_avm, p_avt ) !!---------------------------------------------------------------------- !! *** ROUTINE zdf_evd *** !! !! ** Purpose : Local increased the vertical eddy viscosity and diffu- !! sivity coefficients when a static instability is encountered. !! !! ** Method : tracer (and momentum if nn_evdm=1) vertical mixing !! coefficients are set to rn_evd (namelist parameter) !! if the water column is statically unstable. !! The test of static instability is performed using !! Brunt-Vaisala frequency (rn2 < -1.e-12) of to successive !! time-step (Leap-Frog environnement): before and !! now time-step. !! !! ** Action : avt, avm enhanced where static instability occurs !!---------------------------------------------------------------------- INTEGER , INTENT(in ) :: kt ! ocean time-step indexocean time step REAL(wp), DIMENSION(:,:,:) , INTENT(inout) :: p_avm, p_avt ! momentum and tracer Kz (w-points) ! INTEGER :: ji, jj, jk ! dummy loop indices REAL(wp), DIMENSION(jpi,jpj,jpk) :: zavt_evd, zavm_evd !!---------------------------------------------------------------------- ! IF( kt == nit000 ) THEN IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)' IF(lwp) WRITE(numout,*) '~~~~~~~ ' IF(lwp) WRITE(numout,*) ENDIF ! ! zavt_evd(:,:,:) = p_avt(:,:,:) ! set avt prior to evd application ! SELECT CASE ( nn_evdm ) ! CASE ( 1 ) !== enhance tracer & momentum Kz ==! (if rn2<-1.e-12) ! zavm_evd(:,:,:) = p_avm(:,:,:) ! set avm prior to evd application ! !! change last digits results ! WHERE( MAX( rn2(2:jpi,2:jpj,2:jpkm1), rn2b(2:jpi,2:jpj,2:jpkm1) ) <= -1.e-12 ) THEN ! p_avt(2:jpi,2:jpj,2:jpkm1) = rn_evd * wmask(2:jpi,2:jpj,2:jpkm1) ! p_avm(2:jpi,2:jpj,2:jpkm1) = rn_evd * wmask(2:jpi,2:jpj,2:jpkm1) ! END WHERE ! DO jk = 1, jpkm1 DO jj = 2, jpjm1 DO ji = 2, jpim1 IF( MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) THEN p_avt(ji,jj,jk) = rn_evd * wmask(ji,jj,jk) p_avm(ji,jj,jk) = rn_evd * wmask(ji,jj,jk) ENDIF END DO END DO END DO ! zavm_evd(:,:,:) = p_avm(:,:,:) - zavm_evd(:,:,:) ! change in avm due to evd CALL iom_put( "avm_evd", zavm_evd ) ! output this change ! CASE DEFAULT !== enhance tracer Kz ==! (if rn2<-1.e-12) !! change last digits results ! WHERE( MAX( rn2(2:jpi,2:jpj,2:jpkm1), rn2b(2:jpi,2:jpj,2:jpkm1) ) <= -1.e-12 ) ! p_avt(2:jpi,2:jpj,2:jpkm1) = rn_evd * wmask(2:jpi,2:jpj,2:jpkm1) ! END WHERE DO jk = 1, jpkm1 DO jj = 2, jpjm1 DO ji = 2, jpim1 IF( MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) & p_avt(ji,jj,jk) = rn_evd * wmask(ji,jj,jk) END DO END DO END DO ! END SELECT ! zavt_evd(:,:,:) = p_avt(:,:,:) - zavt_evd(:,:,:) ! change in avt due to evd CALL iom_put( "avt_evd", zavt_evd ) ! output this change IF( l_trdtra ) CALL trd_tra( kt, 'TRA', jp_tem, jptra_evd, zavt_evd ) ! END SUBROUTINE zdf_evd !!====================================================================== END MODULE zdfevd