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C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep.F,v 1.17 1999/08/30 18:25:33 adcroft Exp $ |
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#include "CPP_OPTIONS.h" |
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|
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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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SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax, |
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I K, |
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I myIter, myThid ) |
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implicit none |
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|
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C == Global variables == |
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#include "SIZE.h" |
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#include "DYNVARS.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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|
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C == Routine Arguments == |
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INTEGER bi,bj,iMin,iMax,jMin,jMax |
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INTEGER K |
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INTEGER myIter, myThid |
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|
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C == Local variables == |
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INTEGER i,j |
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_RL ab15,ab05 |
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|
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C Adams-Bashforth timestepping weights |
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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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|
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C Step forward zonal velocity (store in Gu) |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gUNm1(i,j,k,bi,bj)=uVel(i,j,k,bi,bj) |
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& +deltaTmom*(ab15*gU(i,j,k,bi,bj)+ab05*gUNm1(i,j,k,bi,bj) |
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#ifdef INCLUDE_CD_CODE |
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& +guCD(i,j,k,bi,bj) |
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#endif |
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& )*_maskW(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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C Step forward meridional velocity (store in Gv) |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gVNm1(i,j,k,bi,bj)=vVel(i,j,k,bi,bj) |
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& +deltaTmom*(ab15*gV(i,j,k,bi,bj)+ab05*gVNm1(i,j,k,bi,bj) |
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#ifdef INCLUDE_CD_CODE |
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& +gvCD(i,j,k,bi,bj) |
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#endif |
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& )*_maskS(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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|
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C Step forward temperature |
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IF (tempStepping) THEN |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gTNm1(i,j,k,bi,bj)=theta(i,j,k,bi,bj) |
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& +deltaTtracer*(ab15*gT(i,j,k,bi,bj)+ab05*gTNm1(i,j,k,bi,bj)) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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C Step forward salt |
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IF (saltStepping) THEN |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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gSNm1(i,j,k,bi,bj)=salt(i,j,k,bi,bj) |
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& +deltaTtracer*(ab15*gS(i,j,k,bi,bj)+ab05*gSNm1(i,j,k,bi,bj)) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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RETURN |
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END |
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