| 1 |
C $Header: /u/gcmpack/MITgcm/model/src/timestep.F,v 1.27 2001/09/26 18:09:16 cnh Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
#include "CPP_OPTIONS.h" |
| 5 |
|
| 6 |
CBOP |
| 7 |
C !ROUTINE: TIMESTEP |
| 8 |
C !INTERFACE: |
| 9 |
SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax, K, |
| 10 |
I phiHyd, phiSurfX, phiSurfY, |
| 11 |
I myIter, myThid ) |
| 12 |
C !DESCRIPTION: \bv |
| 13 |
C *==========================================================* |
| 14 |
C | S/R TIMESTEP |
| 15 |
C | o Step model fields forward in time |
| 16 |
C *==========================================================* |
| 17 |
C \ev |
| 18 |
|
| 19 |
C !USES: |
| 20 |
IMPLICIT NONE |
| 21 |
C == Global variables == |
| 22 |
#include "SIZE.h" |
| 23 |
#include "DYNVARS.h" |
| 24 |
#include "EEPARAMS.h" |
| 25 |
#include "PARAMS.h" |
| 26 |
#include "GRID.h" |
| 27 |
#include "SURFACE.h" |
| 28 |
|
| 29 |
C !INPUT/OUTPUT PARAMETERS: |
| 30 |
C == Routine Arguments == |
| 31 |
C phiHyd - Hydrostatic Potential (ocean: pressure/rho) |
| 32 |
C (atmos: geopotentiel) |
| 33 |
C phiSurfX, - gradient of Surface potentiel (Pressure/rho, ocean) |
| 34 |
C phiSurfY or geopotentiel (atmos) in X and Y direction |
| 35 |
INTEGER bi,bj,iMin,iMax,jMin,jMax |
| 36 |
INTEGER K |
| 37 |
_RL phiHyd(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
| 38 |
_RL phiSurfX(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 39 |
_RL phiSurfY(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 40 |
INTEGER myIter, myThid |
| 41 |
|
| 42 |
C !LOCAL VARIABLES: |
| 43 |
C == Local variables == |
| 44 |
INTEGER i,j |
| 45 |
_RL ab15,ab05 |
| 46 |
_RL phxFac,phyFac, psFac |
| 47 |
_RL gUtmp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 48 |
_RL gVtmp(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 49 |
CEOP |
| 50 |
|
| 51 |
C Adams-Bashforth timestepping weights |
| 52 |
IF (myIter .EQ. 0) THEN |
| 53 |
ab15=1.0 |
| 54 |
ab05=0.0 |
| 55 |
ELSE |
| 56 |
ab15=1.5+abeps |
| 57 |
ab05=-0.5-abeps |
| 58 |
ENDIF |
| 59 |
|
| 60 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 61 |
C- Compute effective gU term (including Adams-Bashforth weights) : |
| 62 |
DO j=jMin,jMax |
| 63 |
DO i=iMin,iMax |
| 64 |
gUtmp(i,j) = ab15*gU(i,j,k,bi,bj) |
| 65 |
& + ab05*gUNm1(i,j,k,bi,bj) |
| 66 |
#ifdef INCLUDE_CD_CODE |
| 67 |
& + guCD(i,j,k,bi,bj) |
| 68 |
#endif |
| 69 |
ENDDO |
| 70 |
ENDDO |
| 71 |
|
| 72 |
#ifdef NONLIN_FRSURF |
| 73 |
IF (.NOT. vectorInvariantMomentum |
| 74 |
& .AND. nonlinFreeSurf.GT.1) THEN |
| 75 |
IF (select_rStar.GT.0) THEN |
| 76 |
DO j=jMin,jMax |
| 77 |
DO i=iMin,iMax |
| 78 |
gUtmp(i,j) = gUtmp(i,j)/rStarExpW(i,j,bi,bj) |
| 79 |
ENDDO |
| 80 |
ENDDO |
| 81 |
ELSE |
| 82 |
DO j=jMin,jMax |
| 83 |
DO i=iMin,iMax |
| 84 |
IF ( k.EQ.ksurfW(i,j,bi,bj) ) THEN |
| 85 |
gUtmp(i,j) = gUtmp(i,j) |
| 86 |
& *hFacW(i,j,k,bi,bj)/hFac_surfW(i,j,bi,bj) |
| 87 |
ENDIF |
| 88 |
ENDDO |
| 89 |
ENDDO |
| 90 |
ENDIF |
| 91 |
ENDIF |
| 92 |
#endif |
| 93 |
|
| 94 |
C Step forward zonal velocity (store in Gu) |
| 95 |
psFac = pfFacMom*(1. _d 0 - implicSurfPress) |
| 96 |
DO j=jMin,jMax |
| 97 |
DO i=iMin,iMax |
| 98 |
gUNm1(i,j,k,bi,bj) = uVel(i,j,k,bi,bj) |
| 99 |
& +deltaTmom*( |
| 100 |
& gUtmp(i,j) |
| 101 |
& - psFac*phiSurfX(i,j) |
| 102 |
& )*_maskW(i,j,k,bi,bj) |
| 103 |
ENDDO |
| 104 |
ENDDO |
| 105 |
|
| 106 |
IF (staggerTimeStep) THEN |
| 107 |
C-- -grad Phi_Hyd has not been incorporated to gU and is added here: |
| 108 |
phxFac = pfFacMom*deltaTmom |
| 109 |
DO j=jMin,jMax |
| 110 |
DO i=iMin,iMax |
| 111 |
gUNm1(i,j,k,bi,bj)=gUNm1(i,j,k,bi,bj) |
| 112 |
& - _recip_dxC(i,j,bi,bj) |
| 113 |
& *(phiHyd(i,j,k)-phiHyd(i-1,j,k))*phxFac |
| 114 |
& *_maskW(i,j,k,bi,bj) |
| 115 |
ENDDO |
| 116 |
ENDDO |
| 117 |
ENDIF |
| 118 |
|
| 119 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 120 |
C- Compute effective gV term (including Adams-Bashforth weights) : |
| 121 |
DO j=jMin,jMax |
| 122 |
DO i=iMin,iMax |
| 123 |
gVtmp(i,j) = ab15*gV(i,j,k,bi,bj) |
| 124 |
& + ab05*gVNm1(i,j,k,bi,bj) |
| 125 |
#ifdef INCLUDE_CD_CODE |
| 126 |
& + gvCD(i,j,k,bi,bj) |
| 127 |
#endif |
| 128 |
ENDDO |
| 129 |
ENDDO |
| 130 |
|
| 131 |
#ifdef NONLIN_FRSURF |
| 132 |
IF (.NOT. vectorInvariantMomentum |
| 133 |
& .AND. nonlinFreeSurf.GT.1) THEN |
| 134 |
IF (select_rStar.GT.0) THEN |
| 135 |
DO j=jMin,jMax |
| 136 |
DO i=iMin,iMax |
| 137 |
gVtmp(i,j) = gVtmp(i,j)/rStarExpS(i,j,bi,bj) |
| 138 |
ENDDO |
| 139 |
ENDDO |
| 140 |
ELSE |
| 141 |
DO j=jMin,jMax |
| 142 |
DO i=iMin,iMax |
| 143 |
IF ( k.EQ.ksurfS(i,j,bi,bj) ) THEN |
| 144 |
gVtmp(i,j) = gVtmp(i,j) |
| 145 |
& *hFacS(i,j,k,bi,bj)/hFac_surfS(i,j,bi,bj) |
| 146 |
ENDIF |
| 147 |
ENDDO |
| 148 |
ENDDO |
| 149 |
ENDIF |
| 150 |
ENDIF |
| 151 |
#endif |
| 152 |
|
| 153 |
C Step forward meridional velocity (store in Gv) |
| 154 |
psFac = pfFacMom*(1. _d 0 - implicSurfPress) |
| 155 |
DO j=jMin,jMax |
| 156 |
DO i=iMin,iMax |
| 157 |
gVNm1(i,j,k,bi,bj) = vVel(i,j,k,bi,bj) |
| 158 |
& +deltaTmom*( |
| 159 |
& gVtmp(i,j) |
| 160 |
& - psFac*phiSurfY(i,j) |
| 161 |
& )*_maskS(i,j,k,bi,bj) |
| 162 |
ENDDO |
| 163 |
ENDDO |
| 164 |
|
| 165 |
IF (staggerTimeStep) THEN |
| 166 |
C-- -grad Phi_Hyd has not been incorporated to gV and is added here: |
| 167 |
phyFac = pfFacMom*deltaTmom |
| 168 |
DO j=jMin,jMax |
| 169 |
DO i=iMin,iMax |
| 170 |
gVNm1(i,j,k,bi,bj)=gVNm1(i,j,k,bi,bj) |
| 171 |
& - _recip_dyC(i,j,bi,bj) |
| 172 |
& *(phiHyd(i,j,k)-phiHyd(i,j-1,k))*phyFac |
| 173 |
& *_maskS(i,j,k,bi,bj) |
| 174 |
ENDDO |
| 175 |
ENDDO |
| 176 |
ENDIF |
| 177 |
|
| 178 |
RETURN |
| 179 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph