MODULE dynspg_exp !!====================================================================== !! *** MODULE dynspg_exp *** !! Ocean dynamics: surface pressure gradient trend, explicit scheme !!====================================================================== !! History : 2.0 ! 2005-11 (V. Garnier, G. Madec, L. Bessieres) Original code !! 3.2 ! 2009-06 (G. Madec, M. Leclair, R. Benshila) introduce sshwzv module !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! dyn_spg_exp : update the momentum trend with the surface !! pressure gradient in the free surface constant !! volume case with vector optimization !!---------------------------------------------------------------------- USE oce ! ocean dynamics and tracers USE dom_oce ! ocean space and time domain USE sbc_oce ! surface boundary condition: ocean USE phycst ! physical constants ! USE in_out_manager ! I/O manager USE lib_mpp ! distributed memory computing library USE lbclnk ! ocean lateral boundary conditions (or mpp link) USE prtctl ! Print control USE iom ! I/O library IMPLICIT NONE PRIVATE PUBLIC dyn_spg_exp ! called in dynspg.F90 !! * Substitutions # include "vectopt_loop_substitute.h90" !!---------------------------------------------------------------------- !! NEMO/OCE 4.0 , NEMO Consortium (2018) !! $Id$ !! Software governed by the CeCILL license (see ./LICENSE) !!---------------------------------------------------------------------- CONTAINS SUBROUTINE dyn_spg_exp( kt ) !!---------------------------------------------------------------------- !! *** routine dyn_spg_exp *** !! !! ** Purpose : Compute the now trend due to the surface pressure !! gradient in case of explicit free surface formulation and !! add it to the general trend of momentum equation. !! !! ** Method : Explicit free surface formulation. Add to the general !! momentum trend the surface pressure gradient : !! (ua,va) = (ua,va) + (spgu,spgv) !! where spgu = -1/rau0 d/dx(ps) = -g/e1u di( sshn ) !! spgv = -1/rau0 d/dy(ps) = -g/e2v dj( sshn ) !! !! ** Action : (ua,va) trend of horizontal velocity increased by !! the surf. pressure gradient trend !!--------------------------------------------------------------------- INTEGER, INTENT(in) :: kt ! ocean time-step index !! INTEGER :: ji, jj, jk ! dummy loop indices !!---------------------------------------------------------------------- ! IF( kt == nit000 ) THEN IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'dyn_spg_exp : surface pressure gradient trend' IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ (explicit free surface)' ! spgu(:,:) = 0._wp ; spgv(:,:) = 0._wp ! IF( .NOT.ln_linssh .AND. lwp ) WRITE(numout,*) ' non linear free surface: spg is included in dynhpg' ENDIF IF( ln_linssh ) THEN !* linear free surface : add the surface pressure gradient trend ! DO jj = 2, jpjm1 ! now surface pressure gradient DO ji = fs_2, fs_jpim1 ! vector opt. spgu(ji,jj) = - grav * ( sshn(ji+1,jj) - sshn(ji,jj) ) * r1_e1u(ji,jj) spgv(ji,jj) = - grav * ( sshn(ji,jj+1) - sshn(ji,jj) ) * r1_e2v(ji,jj) END DO END DO ! DO jk = 1, jpkm1 ! Add it to the general trend DO jj = 2, jpjm1 DO ji = fs_2, fs_jpim1 ! vector opt. ua(ji,jj,jk) = ua(ji,jj,jk) + spgu(ji,jj) va(ji,jj,jk) = va(ji,jj,jk) + spgv(ji,jj) END DO END DO END DO ! ENDIF ! END SUBROUTINE dyn_spg_exp !!====================================================================== END MODULE dynspg_exp