MODULE dynbfr !!============================================================================== !! *** MODULE dynbfr *** !! Ocean dynamics : bottom friction component of the momentum mixing trend !!============================================================================== !! History : 3.2 ! 2008-11 (A. C. Coward) Original code !! 3.4 ! 2011-09 (H. Liu) Make it consistent with semi-implicit !! Bottom friction (ln_bfrimp = .true.) !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! dyn_bfr : Update the momentum trend with the bottom friction contribution !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers variables USE dom_oce ! ocean space and time domain variables USE zdf_oce ! ocean vertical physics variables USE zdfbfr ! ocean bottom friction variables USE trdmod ! ocean active dynamics and tracers trends USE trdmod_oce ! ocean variables trends USE in_out_manager ! I/O manager USE prtctl ! Print control USE timing ! Timing USE wrk_nemo ! Memory Allocation IMPLICIT NONE PRIVATE PUBLIC dyn_bfr ! routine called by step.F90 !! * Substitutions # include "domzgr_substitute.h90" # include "zdfddm_substitute.h90" # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OPA 3.3 , NEMO Consortium (2010) !! $Id$ !! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE dyn_bfr( kt ) !!---------------------------------------------------------------------- !! *** ROUTINE dyn_bfr *** !! !! ** Purpose : compute the bottom friction ocean dynamics physics. !! !! ** Action : (ua,va) momentum trend increased by bottom friction trend !!--------------------------------------------------------------------- INTEGER, INTENT(in) :: kt ! ocean time-step index !! INTEGER :: ji, jj ! dummy loop indexes INTEGER :: ikbu, ikbv ! local integers REAL(wp) :: zm1_2dt ! local scalar REAL(wp), POINTER, DIMENSION(:,:,:) :: ztrdu, ztrdv !!--------------------------------------------------------------------- ! IF( nn_timing == 1 ) CALL timing_start('dyn_bfr') ! IF( .NOT.ln_bfrimp) THEN ! only for explicit bottom friction form ! implicit bfr is implemented in dynzdf_imp zm1_2dt = - 1._wp / ( 2._wp * rdt ) IF( l_trddyn ) THEN ! temporary save of ua and va trends CALL wrk_alloc( jpi,jpj,jpk, ztrdu, ztrdv ) ztrdu(:,:,:) = ua(:,:,:) ztrdv(:,:,:) = va(:,:,:) ENDIF # if defined key_vectopt_loop DO jj = 1, 1 DO ji = jpi+2, jpij-jpi-1 ! vector opt. (forced unrolling) # else DO jj = 2, jpjm1 DO ji = 2, jpim1 # endif ikbu = mbku(ji,jj) ! deepest ocean u- & v-levels ikbv = mbkv(ji,jj) ! ! Apply stability criteria on absolute value : abs(bfr/e3) < 1/(2dt) => bfr/e3 > -1/(2dt) ua(ji,jj,ikbu) = ua(ji,jj,ikbu) + MAX( bfrua(ji,jj) / fse3u(ji,jj,ikbu) , zm1_2dt ) * ub(ji,jj,ikbu) va(ji,jj,ikbv) = va(ji,jj,ikbv) + MAX( bfrva(ji,jj) / fse3v(ji,jj,ikbv) , zm1_2dt ) * vb(ji,jj,ikbv) END DO END DO ! IF( l_trddyn ) THEN ! save the vertical diffusive trends for further diagnostics ztrdu(:,:,:) = ua(:,:,:) - ztrdu(:,:,:) ztrdv(:,:,:) = va(:,:,:) - ztrdv(:,:,:) CALL trd_mod( ztrdu(:,:,:), ztrdv(:,:,:), jpdyn_trd_bfr, 'DYN', kt ) CALL wrk_dealloc( jpi,jpj,jpk, ztrdu, ztrdv ) ENDIF ! ! print mean trends (used for debugging) IF(ln_ctl) CALL prt_ctl( tab3d_1=ua, clinfo1=' bfr - Ua: ', mask1=umask, & & tab3d_2=va, clinfo2= ' Va: ', mask2=vmask, clinfo3='dyn' ) ! ENDIF ! end explicit bottom friction ! IF( nn_timing == 1 ) CALL timing_stop('dyn_bfr') ! END SUBROUTINE dyn_bfr !!============================================================================== END MODULE dynbfr