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jscott |
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C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_x.F,v 1.3 2001/09/21 13:11:43 adcroft 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_X |
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C !INTERFACE: ========================================================== |
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SUBROUTINE GAD_DIFF_X( |
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I bi,bj,k, |
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I xA, diffKh, |
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I tracer, |
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O dfx, |
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I myThid ) |
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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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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 xA :: area of face at U points |
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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,k |
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_RS xA (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL diffKh (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL tracer(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 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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C print *,'in gad_diff_x' |
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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(i,j,k)*xA(i,j) |
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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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RETURN |
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END |
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c---------------------------------------------------------- |
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SUBROUTINE CALC_MLD(bi,bj,diffkh3d_x,diffkh3d_y,myThid) |
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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 "DYNVARS.h" |
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#include "GRID.h" |
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INTEGER bi,bj |
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_RL diffkh3d_x (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL diffkh3d_y (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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INTEGER myThid |
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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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cjrs next |
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_RL rhoK (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL Khplus,gradij,gradim1,gradjm1,calc_grad |
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real *8 khconst,khmin,khmax |
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parameter ( khconst=5.d15 ) |
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parameter ( khmin=1000.0 ) |
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parameter ( khmax=40000.0 ) |
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cjrs try constants 6e14, 3e15, 5e15, 10e15 |
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c jrs next |
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C print *,'in calc_mld for Khplus ' |
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CALL FIND_RHO( |
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& bi,bj,1-Olx,sNx+OLx,1-OLy,sNy+OLy,1,1, |
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& theta,salt,rhoK,myThid) |
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DO j=1-Oly,sNy+Oly |
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DO i=1-Olx+1,sNx+Olx |
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if (hfacc(i,j,1,bi,bj).ne.0) then |
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gradij=calc_grad(i,j,bi,bj,rhoK) |
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endif |
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if ( (hfacc(i,j,1,bi,bj).ne.0).and. |
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& (hfacc(i-1,j,1,bi,bj).ne.0) ) then |
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gradim1=calc_grad(i-1,j,bi,bj,rhoK) |
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if ((gradij.ne.0).and.(gradim1.ne.0)) then |
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Khplus= khconst*(gradij+gradim1)/2 |
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elseif (gradij.ne.0) then |
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Khplus= khconst*gradij |
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elseif (gradim1.ne.0) then |
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Khplus= khconst*gradim1 |
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else |
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Khplus=0.d0 |
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endif |
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if (Khplus.lt.khmin) Khplus=khmin |
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if (Khplus.gt.khmax) Khplus=khmax |
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if (j.ge.43) Khplus=khmin |
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diffkh3d_x(i,j,1)=Khplus |
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c diffkh3d_x(i,j,2)=0.5*Khplus |
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c diffkh3d_x(i,j,3)=0.2*Khplus |
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C print *,'Khplus_x: ',i,j,Khplus |
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else |
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diffkh3d_x(i,j,1)=0.d0 |
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endif |
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if ( (hfacc(i,j,1,bi,bj).ne.0).and. |
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& (hfacc(i,j-1,1,bi,bj).ne.0) ) then |
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gradjm1=calc_grad(i,j-1,bi,bj,rhoK) |
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if ((gradij.ne.0).and.(gradjm1.ne.0)) then |
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Khplus= khconst*(gradij+gradjm1)/2 |
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elseif (gradij.ne.0) then |
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Khplus= khconst*gradij |
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elseif (gradjm1.ne.0) then |
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Khplus= khconst*gradjm1 |
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else |
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Khplus=0.d0 |
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endif |
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if (Khplus.lt.khmin) Khplus=khmin |
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if (Khplus.gt.khmax) Khplus=khmax |
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if (j.ge.43) Khplus=khmin |
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diffkh3d_y(i,j,1)=Khplus |
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c diffkh3d_y(i,j,2)=0.5*Khplus |
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c diffkh3d_y(i,j,3)=0.2*Khplus |
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C print *,'Khplus_y: ',i,j,Khplus |
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else |
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diffkh3d_y(i,j,1)=0.d0 |
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endif |
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ENDDO |
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ENDDO |
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return |
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end |
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c-------------------------------------------------- |
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real*8 FUNCTION CALC_GRAD(i,j,bi,bj,rhoK) |
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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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INTEGER i,j,bi,bj |
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_RL rhoK (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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c Local variables |
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integer xno,yno |
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_RL xgrad,ygrad |
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c print *,'entering calc_gradient...for ',i,j |
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if (hfacC(i,j,1,bi,bj).eq.0) then |
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calc_grad=0.d0 |
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else |
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xgrad=0.d0 |
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xno=0 |
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if (hfacC(i+1,j,1,bi,bj).ne.0) then |
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xgrad= abs((rhoK(i+1,j)-rhoK(i,j))*_recip_dxC(i+1,j,bi,bj)) |
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xno=1 |
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c print *,'gradient with i+1: ',xgrad |
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endif |
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if (hfacC(i-1,j,1,bi,bj).ne.0) then |
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xgrad= xgrad + |
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& abs((rhoK(i,j)-rhoK(i-1,j))*_recip_dxC(i,j,bi,bj)) |
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xno=xno+1 |
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c print *,'gradient with i-1: ', |
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c & abs((rhoK(i,j)-rhoK(i-1,j))*_recip_dxC(i,j,bi,bj)) |
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endif |
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ygrad=0.d0 |
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yno=0 |
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if (hfacC(i,j+1,1,bi,bj).ne.0) then |
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ygrad= abs((rhoK(i,j+1)-rhoK(i,j))*_recip_dyC(i,j+1,bi,bj)) |
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yno=1 |
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endif |
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if (hfacC(i,j-1,1,bi,bj).ne.0) then |
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ygrad= ygrad + |
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& abs((rhoK(i,j)-rhoK(i,j-1))*_recip_dyC(i,j,bi,bj)) |
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yno=yno+1 |
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endif |
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if ((xno.ne.0).and.(yno.ne.0)) then |
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calc_grad=(xgrad/xno)*(xgrad/xno) + |
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& (ygrad/yno)*(ygrad/yno) |
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elseif (xno.ne.0) then |
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calc_grad= (xgrad/xno)*(xgrad/xno) |
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else |
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calc_grad= (ygrad/yno)*(ygrad/yno) |
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endif |
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endif |
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return |
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end |
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