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C $Header: /u/gcmpack/MITgcm/pkg/mom_fluxform/mom_u_coriolis.F,v 1.8 2006/12/05 05:29:48 jmc Exp $ |
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C $Name: $ |
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edhill |
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#include "MOM_FLUXFORM_OPTIONS.h" |
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CBOP |
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C !ROUTINE: MOM_U_CORIOLIS |
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C !INTERFACE: ========================================================== |
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SUBROUTINE MOM_U_CORIOLIS( |
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I bi,bj,k,vFld, |
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U uCoriolisTerm, |
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I myThid) |
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C !DESCRIPTION: |
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C Calculates the horizontal Coriolis term in the zonal equation: |
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C \begin{equation*} |
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C \overline{f}^i \overline{v}^{ij} |
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C \end{equation*} |
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C !USES: =============================================================== |
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IMPLICIT NONE |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "SURFACE.h" |
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C !INPUT PARAMETERS: =================================================== |
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C bi,bj :: tile indices |
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C k :: vertical level |
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C vFld :: meridional flow |
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C myThid :: thread number |
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INTEGER bi,bj,k |
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_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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C !OUTPUT PARAMETERS: ================================================== |
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C uCoriolisTerm :: Coriolis term |
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_RL uCoriolisTerm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C !LOCAL VARIABLES: ==================================================== |
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C i,j :: loop indices |
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INTEGER i,j |
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_RS one |
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PARAMETER( one = 1. _d 0 ) |
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CEOP |
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IF (useEnergyConservingCoriolis) THEN |
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C Energy conserving discretization |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx+1,sNx+Olx |
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uCoriolisTerm(i,j) = |
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& 0.5*( _fCori( i ,j,bi,bj) |
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& *0.5*( vFld( i ,j)+vFld( i ,j+1) ) |
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& + _fCori(i-1,j,bi,bj) |
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& *0.5*( vFld(i-1,j)+vFld(i-1,j+1) ) ) |
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ENDDO |
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ENDDO |
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ELSE |
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C Original discretization |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx+1,sNx+Olx |
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uCoriolisTerm(i,j) = |
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& 0.5*( _fCori( i ,j,bi,bj) + |
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& _fCori(i-1,j,bi,bj) ) |
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& *0.25*( |
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& vFld( i ,j)+vFld( i ,j+1) |
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& +vFld(i-1,j)+vFld(i-1,j+1) |
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& ) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF (useJamartWetPoints) THEN |
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C Scale term so that only "wet" points are used |
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C Due to: Jamart and Ozer, 1986, JGR 91 (C9), 10,621-10,631 |
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C "Numerical Boundary Layers and Spurious Residual Flows" |
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx+1,sNx+Olx |
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uCoriolisTerm(i,j) = uCoriolisTerm(i,j) |
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1.9 |
& *4. _d 0/MAX( one, |
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& maskS( i , j ,k,bi,bj)+maskS( i ,j+1,k,bi,bj) |
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& +maskS(i-1, j ,k,bi,bj)+maskS(i-1,j+1,k,bi,bj) ) |
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ENDDO |
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ENDDO |
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ENDIF |
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RETURN |
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END |
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