MODULE trcldf_lap !!====================================================================== !! *** MODULE trcldf_lap *** !! Ocean passive tracers: horizontal component of the lateral tracer mixing trend !!====================================================================== !! History : 1.0 ! 87-06 (P. Andrich, D. L Hostis) Original code !! ! 91-11 (G. Madec) !! ! 95-02 (M. Levy) passive tracers !! ! 95-11 (G. Madec) suppress volumetric scale factors !! ! 96-01 (G. Madec) statement function for e3 !! 8.5 ! 02-06 (G. Madec) F90: Free form and module !! 9.0 ! 04-03 (C. Ethe) passive tracer !! ! 07-02 (C. Deltel) Diagnose ML trends for passive tracers !!---------------------------------------------------------------------- #if defined key_top !!---------------------------------------------------------------------- !! trc_ldf_lap : update the tracer trend with the horizontal diffusion !! using a iso-level harmonic (laplacien) operator. !!---------------------------------------------------------------------- USE oce_trc ! ocean dynamics and active tracers variables USE trp_trc ! ocean passive tracers variables USE prtctl_trc ! Print control for debbuging USE trdmld_trc USE trdmld_trc_oce IMPLICIT NONE PRIVATE !! * Routine accessibility PUBLIC trc_ldf_lap ! routine called by step.F90 !! * Substitutions # include "top_substitute.h90" !!---------------------------------------------------------------------- !! TOP 1.0 , LOCEAN-IPSL (2005) !! $Header: /home/opalod/NEMOCVSROOT/NEMO/TOP_SRC/TRP/trcldf_lap.F90,v 1.10 2006/09/12 11:10:14 opalod Exp $ !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE trc_ldf_lap( kt ) !!---------------------------------------------------------------------- !! *** ROUTINE trc_ldf_lap *** !! !! ** Purpose : Compute the before horizontal tracer diffusive !! trend and add it to the general trend of tracer equation. !! !! ** Method : Second order diffusive operator evaluated using before !! fields (forward time scheme). The horizontal diffusive trends of !! the passive tracer is given by: !! * s-coordinate, the vertical scale !! factors e3. are inside the derivatives: !! difft = 1/(e1t*e2t*e3t) { di-1[ aht e2u*e3u/e1u di(trb) ] !! + dj-1[ aht e1v*e3v/e2v dj(trb) ] } !! * z-coordinate (default key), e3t=e3u=e3v, the trend becomes: !! difft = 1/(e1t*e2t) { di-1[ aht e2u/e1u di(trb) ] !! + dj-1[ aht e1v/e2v dj(trb) ] } !! Add this trend to the general tracer trend tra : !! tra = tra + difft !! !! ** Action : - Update tra arrays with the before iso-level !! harmonic mixing trend. !! - Save the trends ('key_trdmld_trc') !!---------------------------------------------------------------------- USE oce_trc , ztu => ua, & ! use ua as workspace & ztv => va ! use va as workspace INTEGER, INTENT( in ) :: kt ! ocean time-step index !! * Local save REAL(wp), DIMENSION(jpi,jpj), SAVE :: & ze1ur, ze2vr, zbtr2 ! scale factor coefficients INTEGER :: ji, jj, jk, jn ! dummy loop indices REAL(wp) :: & zabe1, zabe2, zbtr ! temporary scalars REAL(wp) :: & ztrax, ztray ! workspace CHARACTER (len=22) :: charout REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: ztrtrd !!---------------------------------------------------------------------- IF( kt == nittrc000 ) THEN IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'trc_ldf_lap : iso-level laplacian diffusion' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ ' ze1ur(:,:) = e2u(:,:) / e1u(:,:) ze2vr(:,:) = e1v(:,:) / e2v(:,:) zbtr2(:,:) = 1. / ( e1t(:,:) * e2t(:,:) ) ENDIF IF( l_trdtrc ) THEN ! STOP 'trcldf_lap: this was never validated, please comment this line to proceed...' ENDIF IF( l_trdtrc ) ALLOCATE( ztrtrd(jpi,jpj,jpk) ) ! ! =========== DO jn = 1, jptra ! tracer loop ! ! =========== IF( l_trdtrc ) ztrtrd(:,:,:) = tra(:,:,:,jn) ! ! ============= DO jk = 1, jpkm1 ! Vertical slab ! ! ============= ! 1. First derivative (gradient) ! ------------------------------ DO jj = 1, jpjm1 DO ji = 1, fs_jpim1 ! vector opt. IF ( ln_sco ) THEN zabe1 = fsahtru(ji,jj,jk) * umask(ji,jj,jk) * ze1ur(ji,jj) * fse3u(ji,jj,jk) zabe2 = fsahtrv(ji,jj,jk) * vmask(ji,jj,jk) * ze2vr(ji,jj) * fse3v(ji,jj,jk) ELSE zabe1 = fsahtru(ji,jj,jk) * umask(ji,jj,jk) * ze1ur(ji,jj) zabe2 = fsahtrv(ji,jj,jk) * vmask(ji,jj,jk) * ze2vr(ji,jj) ENDIF ztu(ji,jj,jk) = zabe1 * ( trb(ji+1,jj ,jk,jn) - trb(ji,jj,jk,jn) ) ztv(ji,jj,jk) = zabe2 * ( trb(ji ,jj+1,jk,jn) - trb(ji,jj,jk,jn) ) END DO END DO ! 2. Second derivative (divergence) ! --------------------------------- DO jj = 2, jpjm1 DO ji = fs_2, fs_jpim1 ! vector opt. IF ( ln_sco ) THEN zbtr = zbtr2(ji,jj) / fse3t(ji,jj,jk) ELSE zbtr = zbtr2(ji,jj) ENDIF ! horizontal diffusive trends ztrax = zbtr * ( ztu(ji,jj,jk) - ztu(ji-1,jj,jk) ) ztray = zbtr * ( ztv(ji,jj,jk) - ztv(ji,jj-1,jk) ) ! add it to the general tracer trends tra(ji,jj,jk,jn) = tra(ji,jj,jk,jn) + ztrax + ztray #if defined key_trc_diatrd ! save the horizontal diffusive trends IF (luttrd(jn)) trtrd(ji,jj,jk,ikeep(jn),4) = ztrax IF (luttrd(jn)) trtrd(ji,jj,jk,ikeep(jn),5) = ztray #endif END DO END DO ! ! ============= END DO ! End of slab ! ! ============= IF( l_trdtrc ) THEN ztrtrd(:,:,:) = tra(:,:,:,jn) - ztrtrd(:,:,:) IF (luttrd(jn)) CALL trd_mod_trc( ztrtrd, jn, jptrc_trd_ldf, kt ) ! trends diags END IF ! ! =========== END DO ! tracer loop ! ! =========== IF( l_trdtrc ) DEALLOCATE( ztrtrd ) IF( ln_ctl ) THEN ! print mean trends (used for debugging) WRITE(charout, FMT="('ldf - lap')") CALL prt_ctl_trc_info( charout ) CALL prt_ctl_trc( tab4d=tra, mask=tmask, clinfo=ctrcnm, clinfo2='trd' ) ENDIF END SUBROUTINE trc_ldf_lap #else !!---------------------------------------------------------------------- !! Default option Empty module !!---------------------------------------------------------------------- CONTAINS SUBROUTINE trc_ldf_lap( kt ) INTEGER, INTENT(in) :: kt WRITE(*,*) 'trc_ldf_lap: You should not have seen this print! error?', kt END SUBROUTINE trc_ldf_lap #endif !!============================================================================== END MODULE trcldf_lap