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jmc |
1.23 |
C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep.F,v 1.22 2001/03/06 17:10:29 jmc Exp $ |
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jmc |
1.21 |
C $Name: $ |
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cnh |
1.1 |
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adcroft |
1.10 |
#include "CPP_OPTIONS.h" |
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cnh |
1.1 |
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C /==========================================================\ |
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C | S/R TIMESTEP | |
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C | o Step model fields forward in time | |
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C \==========================================================/ |
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jmc |
1.21 |
SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax, K, |
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I phiHyd, phiSurfX, phiSurfY, |
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adcroft |
1.17 |
I myIter, myThid ) |
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jmc |
1.21 |
IMPLICIT NONE |
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heimbach |
1.18 |
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C == Global variables == |
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cnh |
1.1 |
#include "SIZE.h" |
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#include "DYNVARS.h" |
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cnh |
1.11 |
#include "EEPARAMS.h" |
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cnh |
1.1 |
#include "PARAMS.h" |
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#include "GRID.h" |
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heimbach |
1.18 |
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cnh |
1.1 |
C == Routine Arguments == |
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jmc |
1.23 |
C phiHyd - Hydrostatic Potential (ocean: pressure/rho) |
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C (atmos: geopotentiel) |
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jmc |
1.21 |
C phiSurfX, - gradient of Surface potentiel (Pressure/rho, ocean) |
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C phiSurfY or geopotentiel (atmos) in X and Y direction |
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cnh |
1.1 |
INTEGER bi,bj,iMin,iMax,jMin,jMax |
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adcroft |
1.4 |
INTEGER K |
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adcroft |
1.19 |
_RL phiHyd(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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jmc |
1.21 |
_RL phiSurfX(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL phiSurfY(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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adcroft |
1.17 |
INTEGER myIter, myThid |
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heimbach |
1.18 |
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cnh |
1.1 |
C == Local variables == |
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adcroft |
1.4 |
INTEGER i,j |
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adcroft |
1.7 |
_RL ab15,ab05 |
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jmc |
1.21 |
_RL phxFac,phyFac, psFac |
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cnh |
1.1 |
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C Adams-Bashforth timestepping weights |
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adcroft |
1.17 |
Caja IF (myIter .EQ. 0) THEN |
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Caja ab15=1.0 |
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Caja ab05=0.0 |
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Caja ELSE |
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ab15=1.5+abeps |
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ab05=-0.5-abeps |
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Caja ENDIF |
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cnh |
1.1 |
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adcroft |
1.7 |
C Step forward zonal velocity (store in Gu) |
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jmc |
1.21 |
psFac = pfFacMom*(1. _d 0 - implicSurfPress) |
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adcroft |
1.19 |
DO j=jMin,jMax |
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cnh |
1.1 |
DO i=iMin,iMax |
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jmc |
1.21 |
gUNm1(i,j,k,bi,bj)=uVel(i,j,k,bi,bj) + deltaTmom * ( |
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& ab15*gU(i,j,k,bi,bj)+ab05*gUNm1(i,j,k,bi,bj) |
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& - psFac*phiSurfX(i,j) |
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cnh |
1.16 |
#ifdef INCLUDE_CD_CODE |
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jmc |
1.21 |
& + guCD(i,j,k,bi,bj) |
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cnh |
1.9 |
#endif |
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adcroft |
1.7 |
& )*_maskW(i,j,k,bi,bj) |
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cnh |
1.1 |
ENDDO |
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adcroft |
1.19 |
ENDDO |
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IF (staggerTimeStep) THEN |
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C-- -grad Phi_Hyd has not been incorporated to gU and is added here: |
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jmc |
1.23 |
phxFac = pfFacMom*deltaTmom |
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adcroft |
1.19 |
DO j=jMin,jMax |
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DO i=iMin,iMax |
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gUNm1(i,j,k,bi,bj)=gUNm1(i,j,k,bi,bj) |
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& - _recip_dxC(i,j,bi,bj) |
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& *(phiHyd(i,j,k)-phiHyd(i-1,j,k))*phxFac |
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& *_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDIF |
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adcroft |
1.12 |
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adcroft |
1.7 |
C Step forward meridional velocity (store in Gv) |
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jmc |
1.21 |
psFac = pfFacMom*(1. _d 0 - implicSurfPress) |
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adcroft |
1.19 |
DO j=jMin,jMax |
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cnh |
1.1 |
DO i=iMin,iMax |
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jmc |
1.21 |
gVNm1(i,j,k,bi,bj)=vVel(i,j,k,bi,bj) + deltaTmom * ( |
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& ab15*gV(i,j,k,bi,bj)+ab05*gVNm1(i,j,k,bi,bj) |
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& - psFac*phiSurfY(i,j) |
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cnh |
1.16 |
#ifdef INCLUDE_CD_CODE |
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jmc |
1.21 |
& + gvCD(i,j,k,bi,bj) |
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cnh |
1.9 |
#endif |
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adcroft |
1.7 |
& )*_maskS(i,j,k,bi,bj) |
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cnh |
1.1 |
ENDDO |
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adcroft |
1.19 |
ENDDO |
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adcroft |
1.12 |
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adcroft |
1.19 |
IF (staggerTimeStep) THEN |
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C-- -grad Phi_Hyd has not been incorporated to gV and is added here: |
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jmc |
1.23 |
phyFac = pfFacMom*deltaTmom |
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adcroft |
1.19 |
DO j=jMin,jMax |
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DO i=iMin,iMax |
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gVNm1(i,j,k,bi,bj)=gVNm1(i,j,k,bi,bj) |
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& - _recip_dyC(i,j,bi,bj) |
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& *(phiHyd(i,j,k)-phiHyd(i,j-1,k))*phyFac |
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& *_maskS(i,j,k,bi,bj) |
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ENDDO |
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adcroft |
1.12 |
ENDDO |
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ENDIF |
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cnh |
1.1 |
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RETURN |
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END |
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