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C $Header: /u/gcmpack/MITgcm/pkg/mom_vecinv/mom_vi_u_vertshear.F,v 1.5 2004/07/20 17:46:38 adcroft Exp $ |
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C $Name: $ |
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|
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#include "MOM_VECINV_OPTIONS.h" |
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|
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SUBROUTINE MOM_VI_U_VERTSHEAR( |
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I bi,bj,K, |
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I uFld,wFld, |
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U uShearTerm, |
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I myThid) |
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IMPLICIT NONE |
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C /==========================================================\ |
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C | S/R MOM_U_VERTSHEAR | |
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C |==========================================================| |
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C \==========================================================/ |
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|
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C == Global variables == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "GRID.h" |
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#include "PARAMS.h" |
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|
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C == Routine arguments == |
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INTEGER bi,bj,K |
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_RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL wFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy) |
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_RL uShearTerm(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER myThid |
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|
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C == Local variables == |
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INTEGER I,J,Kp1,Km1 |
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_RL mask_Kp1,mask_Km1,wBarXm,wBarXp |
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_RL uZm,uZp |
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c _RL umask_Kp1,umask_K,umask_Km1 |
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c LOGICAL freeslipK,noslipK |
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c PARAMETER(freeslipK=.TRUE.) |
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c PARAMETER(noslipK=.NOT.freeslipK) |
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c LOGICAL freeslip1,noslip1 |
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c PARAMETER(freeslip1=.TRUE.) |
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c PARAMETER(noslip1=.NOT.freeslip1) |
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c1 _RL wBarXZ,uZbarZ |
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|
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Kp1=min(K+1,Nr) |
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mask_Kp1=1. |
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IF (K.EQ.Nr) mask_Kp1=0. |
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Km1=max(K-1,1) |
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mask_Km1=1. |
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IF (K.EQ.1) mask_Km1=0. |
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|
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DO J=1-Oly,sNy+Oly |
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DO I=2-Olx,sNx+Olx |
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|
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c umask_K=_maskW(i,j,k,bi,bj) |
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|
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C barZ( barX( W ) ) |
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c wBarXm=0.5*(wFld(I,J,K,bi,bj)+wFld(I-1,J,K,bi,bj)) |
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c wBarXp=0.5*(wFld(I,J,Kp1,bi,bj)+wFld(I-1,J,Kp1,bi,bj)) |
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c & *mask_Kp1 |
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|
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C Transport at interface k |
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wBarXm=0.5*( |
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& wFld(I,J,K,bi,bj)*rA(i,j,bi,bj)*maskC(I,J,Km1,bi,bj) |
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& +wFld(I-1,J,K,bi,bj)*rA(i-1,j,bi,bj)*maskC(I-1,J,Km1,bi,bj) |
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& )*mask_Km1 |
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|
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C Transport at interface k+1 (here wFld is already masked) |
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wBarXp=0.5*( |
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& wFld(I,J,Kp1,bi,bj)*rA(i,j,bi,bj) |
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& +wFld(I-1,J,Kp1,bi,bj)*rA(i-1,j,bi,bj) |
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& )*mask_Kp1 |
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|
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C delta_Z( U ) @ interface k |
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c umask_Km1=mask_Km1*maskW(i,j,Km1,bi,bj) |
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uZm=(mask_Km1*uFld(I,J,Km1,bi,bj)-uFld(I,J,K,bi,bj)) |
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c & *rkFac |
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c2 & *recip_dRC(K) |
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c IF (freeslip1) uZm=uZm*umask_Km1 |
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c IF (noslip1.AND.umask_Km1.EQ.0.) uZm=uZm*2. |
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|
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C delta_Z( U ) @ interface k+1 |
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c umask_Kp1=mask_Kp1*maskW(i,j,Kp1,bi,bj) |
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uZp=(uFld(I,J,K,bi,bj)-mask_Kp1*uFld(I,J,Kp1,bi,bj)) |
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c & *rkFac |
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c2 & *recip_dRC(Kp1) |
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c IF (freeslipK) uZp=uZp*umask_Kp1 |
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c IF (noslipK.AND.umask_Kp1.EQ.0.) uZp=uZp*2. |
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|
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c1 IF (upwindShear) THEN |
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c1 wBarXZ=0.5*( wBarXm + wBarXp ) |
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c1 IF (wBarXZ.GT.0.) THEN |
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c1 uZbarZ=uZp |
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c1 ELSE |
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c1 uZbarZ=uZm |
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c1 ENDIF |
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c1 ELSE |
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c1 uZbarZ=0.5*(uZm+uZp) |
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c1 ENDIF |
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c1 uShearTerm(I,J)=-wBarXZ*uZbarZ*_maskW(I,J,K,bi,bj) |
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|
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c2 uShearTerm(I,J)=-0.5*(wBarXp*uZp+wBarXm*uZm) |
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c2 & *_maskW(I,J,K,bi,bj) |
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IF (upwindShear) THEN |
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uShearTerm(I,J)=-0.5* |
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& ( (wBarXp*uZp+wBarXm*uZm) |
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& +(ABS(wBarXp)*uZp-ABS(wBarXm)*uZm) |
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& )*recip_rAw(i,j,bi,bj) |
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& *recip_hFacW(i,j,k,bi,bj) |
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& *recip_drF(K) |
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ELSE |
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uShearTerm(I,J)=-0.5*(wBarXp*uZp+wBarXm*uZm) |
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& *recip_rAw(i,j,bi,bj) |
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& *recip_hFacW(i,j,k,bi,bj) |
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& *recip_drF(K) |
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ENDIF |
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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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