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C $Header: /u/gcmpack/MITgcm/pkg/cheapaml/gad_diff_2d_x.F,v 1.4 2011/12/28 16:50:17 jmc Exp $ |
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C $Name: $ |
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#include "GAD_OPTIONS.h" |
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CBOP |
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C !ROUTINE: GAD_DIFF_2d_X |
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_DIFF_2d_X( |
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I bi,bj, |
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I diffKh, |
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I tracer, |
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O dfx, |
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I myThid ) |
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|
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C !DESCRIPTION: |
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C Calculates the area integrated zonal flux due to down-gradient diffusion |
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C of a tracer: |
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C \begin{equation*} |
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C F^x_{diff} = - A^x \kappa_h \frac{1}{\Delta x_c} \delta_i \theta |
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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 "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 diffKh :: horizontal diffusivity |
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C tracer :: tracer field |
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C myThid :: thread number |
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INTEGER bi,bj |
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_RL diffKh |
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_RL tracer(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 dfx :: zonal diffusive flux |
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_RL dfx (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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CEOP |
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|
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DO j=1-Oly,sNy+Oly |
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dfx(1-Olx,j)=0. |
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DO i=1-Olx+1,sNx+Olx |
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dfx(i,j) = -diffKh |
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& *_recip_dxC(i,j,bi,bj) |
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& *(Tracer(i,j)-Tracer(i-1,j)) |
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& *CosFacU(j,bi,bj) |
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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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