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C $Header: /u/gcmpack/MITgcm/pkg/mom_vecinv/mom_vi_v_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_V_VERTSHEAR( |
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I bi,bj,K, |
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I vFld,wFld, |
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U vShearTerm, |
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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_V_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 vFld(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 vShearTerm(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,wBarYm,wBarYp |
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_RL vZm,vZp |
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c _RL vmask_Kp1,vmask_K,vmask_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 wBarYZ,vZbarZ |
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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=2-Oly,sNy+Oly |
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DO I=1-Olx,sNx+Olx |
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|
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c vmask_K=_maskS(i,j,k,bi,bj) |
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|
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C barZ( barY( W ) ) |
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c wBarYm=0.5*(wFld(I,J,K,bi,bj)+wFld(I,J-1,K,bi,bj)) |
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c wBarYp=0.5*(wFld(I,J,Kp1,bi,bj)+wFld(I,J-1,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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wBarYm=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,J-1,K,bi,bj)*rA(i,j-1,bi,bj)*maskC(i,j-1,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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wBarYp=0.5*( |
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& wFld(I,J,Kp1,bi,bj)*rA(i,j,bi,bj) |
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& +wFld(I,J-1,Kp1,bi,bj)*rA(i,j-1,bi,bj) |
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& )*mask_Kp1 |
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|
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C delta_Z( V ) @ interface k |
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c vmask_Km1=mask_Km1*maskS(i,j,Km1,bi,bj) |
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vZm=(mask_Km1*vFld(I,J,Km1,bi,bj)-vFld(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) vZm=vZm*vmask_Km1 |
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c IF (noslip1.AND.vmask_Km1.EQ.0.) vZm=vZm*2. |
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|
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C delta_Z( V ) @ interface k+1 |
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c vmask_Kp1=mask_Kp1*maskS(i,j,Kp1,bi,bj) |
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vZp=(vFld(I,J,K,bi,bj)-mask_Kp1*vFld(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) vZp=vZp*vmask_Kp1 |
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c IF (noslipK.AND.vmask_Kp1.EQ.0.) vZp=vZp*2. |
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|
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c1 IF (upwindShear) THEN |
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c1 wBarYZ=0.5*( wBarXm + wBarXp ) |
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c1 IF (wBarYZ.GT.0.) THEN |
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c1 vZbarZ=vZp |
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c1 ELSE |
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c1 vZbarZ=vZm |
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c1 ENDIF |
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c1 ELSE |
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c1 vZbarZ=0.5*(vZm+vZp) |
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c1 ENDIF |
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c1 vShearTerm(I,J)=-wBarYZ*vZbarZ*_maskS(I,J,K,bi,bj) |
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|
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c2 vShearTerm(I,J)=-0.5*(wBarYp*vZp+wBarYm*vZm) |
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c2 & *_maskS(I,J,K,bi,bj) |
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IF (upwindShear) THEN |
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vShearTerm(I,J)=-0.5* |
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& ( (wBarYp*vZp+wBarYm*vZm) |
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& +(ABS(wBarYp)*vZp-ABS(wBarYm)*vZm) |
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& )*recip_rAs(i,j,bi,bj) |
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& *recip_hFacS(i,j,k,bi,bj) |
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& *recip_drF(K) |
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ELSE |
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vShearTerm(I,J)=-0.5*(wBarYp*vZp+wBarYm*vZm) |
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& *recip_rAs(i,j,bi,bj) |
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& *recip_hFacS(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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