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zdfevd.F90 in branches/UKMO/dev_r5518_GO6_package_FOAMv14/NEMOGCM/NEMO/OPA_SRC/ZDF – NEMO

source: branches/UKMO/dev_r5518_GO6_package_FOAMv14/NEMOGCM/NEMO/OPA_SRC/ZDF/zdfevd.F90 @ 11442

Last change on this file since 11442 was 11442, checked in by mattmartin, 5 years ago

Introduction of stochastic physics in NEMO, based on Andrea Storto's code.
For details, see ticket ​https://code.metoffice.gov.uk/trac/utils/ticket/251.
File size: 6.5 KB
RevLine 
[3]1MODULE zdfevd
2   !!======================================================================
3   !!                       ***  MODULE  zdfevd  ***
4   !! Ocean physics: parameterization of convection through an enhancement
5   !!                of vertical eddy mixing coefficient
6   !!======================================================================
[1438]7   !! History :  OPA  !  1997-06  (G. Madec, A. Lazar)  Original code
8   !!   NEMO     1.0  !  2002-06  (G. Madec)  F90: Free form and module
9   !!             -   !  2005-06  (C. Ethe) KPP parameterization
10   !!            3.2  !  2009-03  (M. Leclair, G. Madec, R. Benshila) test on both before & after
11   !!----------------------------------------------------------------------
[3]12
13   !!----------------------------------------------------------------------
[1438]14   !!   zdf_evd      : increase the momentum and tracer Kz at the location of
15   !!                  statically unstable portion of the water column (ln_zdfevd=T)
[3]16   !!----------------------------------------------------------------------
17   USE oce             ! ocean dynamics and tracers variables
18   USE dom_oce         ! ocean space and time domain variables
19   USE zdf_oce         ! ocean vertical physics variables
[255]20   USE zdfkpp          ! KPP vertical mixing
[7061]21   USE trd_oce         ! trends: ocean variables
22   USE trdtra          ! trends manager: tracers
[3]23   USE in_out_manager  ! I/O manager
[1482]24   USE iom             ! for iom_put
[3]25   USE lbclnk          ! ocean lateral boundary conditions (or mpp link)
[3294]26   USE timing          ! Timing
[11442]27   USE stopack         
[3]28
29   IMPLICIT NONE
30   PRIVATE
31
[1438]32   PUBLIC   zdf_evd    ! called by step.F90
[11442]33   REAL(wp), SAVE, ALLOCATABLE, DIMENSION(:,:) :: rn_avevd0
[3]34
[255]35   !! * Substitutions
36#  include "domzgr_substitute.h90"
[3]37   !!----------------------------------------------------------------------
[2715]38   !! NEMO/OPA 4.0 , NEMO Consortium (2011)
[1438]39   !! $Id$
[2715]40   !! Software governed by the CeCILL licence     (NEMOGCM/NEMO_CeCILL.txt)
[3]41   !!----------------------------------------------------------------------
42CONTAINS
43
44   SUBROUTINE zdf_evd( kt )
45      !!----------------------------------------------------------------------
46      !!                  ***  ROUTINE zdf_evd  ***
47      !!                   
48      !! ** Purpose :   Local increased the vertical eddy viscosity and diffu-
49      !!      sivity coefficients when a static instability is encountered.
50      !!
[1546]51      !! ** Method  :   avt, avm, and the 4 neighbouring avmu, avmv coefficients
[3]52      !!      are set to avevd (namelist parameter) if the water column is
53      !!      statically unstable (i.e. if rn2 < -1.e-12 )
54      !!
[1546]55      !! ** Action  :   avt, avm, avmu, avmv updted in static instability cases
56      !!
[1438]57      !! References :   Lazar, A., these de l'universite Paris VI, France, 1997
[3]58      !!----------------------------------------------------------------------
[2715]59      USE oce,   zavt_evd => ua , zavm_evd => va  ! (ua,va) used ua workspace
60      !
61      INTEGER, INTENT( in ) ::   kt   ! ocean time-step indexocean time step
62      !
63      INTEGER ::   ji, jj, jk   ! dummy loop indices
[3]64      !!----------------------------------------------------------------------
[3294]65      !
66      IF( nn_timing == 1 )  CALL timing_start('zdf_evd')
67      !
[3]68      IF( kt == nit000 ) THEN
69         IF(lwp) WRITE(numout,*)
70         IF(lwp) WRITE(numout,*) 'zdf_evd : Enhanced Vertical Diffusion (evd)'
71         IF(lwp) WRITE(numout,*) '~~~~~~~ '
72         IF(lwp) WRITE(numout,*)
[11442]73         ALLOCATE ( rn_avevd0(jpi,jpj) )
74         rn_avevd0(:,:) = rn_avevd
[3]75      ENDIF
76
[1681]77      zavt_evd(:,:,:) = avt(:,:,:)           ! set avt prior to evd application
[255]78
[11442]79      IF( ln_stopack .AND. ( nn_spp_aevd > 0 ) ) THEN
80         rn_avevd0(:,:) = rn_avevd
81         CALL spp_gen(kt, rn_avevd0, nn_spp_aevd, rn_aevd_sd, jk_spp_aevd)
82      ENDIF
83
[1537]84      SELECT CASE ( nn_evdm )
[2715]85      !
[3]86      CASE ( 1 )           ! enhance vertical eddy viscosity and diffusivity (if rn2<-1.e-12)
[2715]87         !
[1681]88         zavm_evd(:,:,:) = avm(:,:,:)           ! set avm prior to evd application
89         !
[1546]90         DO jk = 1, jpkm1 
[3]91            DO jj = 2, jpj             ! no vector opt.
92               DO ji = 2, jpi
[1438]93#if defined key_zdfkpp
[1546]94                  ! no evd mixing in the boundary layer with KPP
[2715]95                  IF(  MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12  .AND.  fsdepw(ji,jj,jk) > hkpp(ji,jj)  ) THEN
[1438]96#else
[2715]97                  IF(  MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 ) THEN
[1438]98#endif
[11442]99                     avt (ji  ,jj  ,jk) = rn_avevd0(ji,jj) * tmask(ji  ,jj  ,jk)
100                     avm (ji  ,jj  ,jk) = rn_avevd0(ji,jj) * tmask(ji  ,jj  ,jk)
101                     avmu(ji  ,jj  ,jk) = rn_avevd0(ji,jj) * umask(ji  ,jj  ,jk)
102                     avmu(ji-1,jj  ,jk) = rn_avevd0(ji,jj) * umask(ji-1,jj  ,jk)
103                     avmv(ji  ,jj  ,jk) = rn_avevd0(ji,jj) * vmask(ji  ,jj  ,jk)
104                     avmv(ji  ,jj-1,jk) = rn_avevd0(ji,jj) * vmask(ji  ,jj-1,jk)
[3]105                  ENDIF
106               END DO
107            END DO
[1546]108         END DO
[2715]109         CALL lbc_lnk( avt , 'W', 1. )   ;   CALL lbc_lnk( avm , 'W', 1. )   ! Lateral boundary conditions
[1546]110         CALL lbc_lnk( avmu, 'U', 1. )   ;   CALL lbc_lnk( avmv, 'V', 1. )
111         !
[1681]112         zavm_evd(:,:,:) = avm(:,:,:) - zavm_evd(:,:,:)   ! change in avm due to evd
113         CALL iom_put( "avm_evd", zavm_evd )              ! output this change
114         !
[3]115      CASE DEFAULT         ! enhance vertical eddy diffusivity only (if rn2<-1.e-12)
[1546]116         DO jk = 1, jpkm1
117!!!         WHERE( rn2(:,:,jk) <= -1.e-12 ) avt(:,:,jk) = tmask(:,:,jk) * avevd   ! agissant sur T SEUL!
[3]118            DO jj = 1, jpj             ! loop over the whole domain (no lbc_lnk call)
119               DO ji = 1, jpi
[1438]120#if defined key_zdfkpp
[1546]121                  ! no evd mixing in the boundary layer with KPP
[2715]122                  IF(  MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12  .AND.  fsdepw(ji,jj,jk) > hkpp(ji,jj)  )   &         
[1438]123#else
[2715]124                  IF(  MIN( rn2(ji,jj,jk), rn2b(ji,jj,jk) ) <= -1.e-12 )   &
[1438]125#endif
[11442]126                     avt(ji,jj,jk) = rn_avevd0(ji,jj) * tmask(ji,jj,jk)
[3]127               END DO
128            END DO
[1546]129         END DO
130         !
[3]131      END SELECT
132
[1681]133      zavt_evd(:,:,:) = avt(:,:,:) - zavt_evd(:,:,:)   ! change in avt due to evd
134      CALL iom_put( "avt_evd", zavt_evd )              ! output this change
[7061]135      IF( l_trdtra ) CALL trd_tra( kt, 'TRA', jp_tem, jptra_evd, zavt_evd )
[1546]136      !
[3294]137      IF( nn_timing == 1 )  CALL timing_stop('zdf_evd')
138      !
[3]139   END SUBROUTINE zdf_evd
140
141   !!======================================================================
142END MODULE zdfevd
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