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C $Header: /u/gcmpack/MITgcm/pkg/mom_common/mom_calc_tension.F,v 1.1 2004/05/14 17:43:11 adcroft Exp $ |
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C $Name: $ |
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|
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#include "MOM_COMMON_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: MOM_CALC_TENSION |
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|
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C !INTERFACE: ========================================================== |
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SUBROUTINE MOM_CALC_TENSION( |
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I bi,bj,k, |
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I uFld, vFld, |
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O tension, |
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I myThid) |
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C !DESCRIPTION: |
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C Calculates the tension of the horizontal flow field (at tracer points): |
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C \begin{equation*} |
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C D_T = \frac{\Delta y_f}{\Delta x_f} \delta_i \frac{u}{\Delta y_g} |
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C - \frac{\Delta x_f}{\Delta y_f} \delta_j \frac{v}{\Delta x_g} |
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C \end{equation*} |
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|
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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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|
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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 uFld :: zonal flow |
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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 uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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|
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C !OUTPUT PARAMETERS: ================================================== |
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C tension :: tension of horizontal flow |
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_RL tension(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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|
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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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CEOP |
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|
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DO j=1-Oly,sNy+Oly-1 |
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DO i=1-Olx,sNx+Olx-1 |
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|
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C Calculate tension of horizontal flow (ignoring lopping factors) |
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C *NOTE* that masking is implicit in the contents of the (u,v) fields. |
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tension(i,j)= |
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& ( dyg( i , j ,bi,bj)*uFld( i , j ) |
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& -dyg(i-1, j ,bi,bj)*uFld(i-1, j ) |
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& -dxg( i , j ,bi,bj)*vFld( i , j ) |
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& +dxg( i ,j-1,bi,bj)*vFld( i ,j-1) )*recip_rAz(i,j,bi,bj) |
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c & (dyf(i,j,bi,bj)*recip_dxf(i,j,bi,bj)) |
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c & *( uFld(i+1, j )*recip_dyg(i+1, j ,bi,bj) |
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c & -uFld( i , j )*recip_dyg( i , j ,bi,bj) ) |
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c & -(dxf(i,j,bi,bj)*recip_dyf(i,j,bi,bj)) |
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c & *( vFld( i ,j+1)*recip_dxg( i ,j+1,bi,bj) |
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c & -vFld( i , j )*recip_dxg( i , j ,bi,bj) ) |
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|
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ENDDO |
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ENDDO |
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|
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RETURN |
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END |
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