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cnh |
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C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep.F,v 1.2 1998/04/24 02:05:42 cnh Exp $ |
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cnh |
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#include "CPP_EEOPTIONS.h" |
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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, myThid ) |
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implicit none |
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! Common |
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#include "SIZE.h" |
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#include "DYNVARS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "CG2D.h" |
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C == Routine Arguments == |
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INTEGER bi,bj,iMin,iMax,jMin,jMax |
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INTEGER myThid |
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C == Local variables == |
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C pg - Pressure gradient terms. Note cg2d_x |
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C holds term in units so that lateral |
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C gradient is all that is needed. |
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INTEGER i,j,k |
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REAL ab15,ab05 |
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_RL pg(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C Adams-Bashforth timestepping weights |
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ab15=1.5+abeps |
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ab05=-0.5-abeps |
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C Zonal pressure term |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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pg(i,j)=rDxC(i,j,bi,bj)* |
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& (cg2d_x(i,j,bi,bj)-cg2d_x(i-1,j,bi,bj)) |
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& *gravity*rhonil |
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ENDDO |
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ENDDO |
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C Step forward zonal velocity |
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DO k=1,Nz |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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uVel(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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& -pg(i,j)/rhonil |
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& )*maskW(i,j,k,bi,bj) |
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gUNm1(i,j,k,bi,bj)=gU(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C Meridional pressure term |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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pg(i,j)=rDyC(i,j,bi,bj)* |
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& (cg2d_x(i,j,bi,bj)-cg2d_x(i,j-1,bi,bj)) |
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& *gravity*rhonil |
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ENDDO |
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ENDDO |
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C Step forward meridional velocity |
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DO k=1,Nz |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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vVel(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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& -pg(i,j)/rhonil |
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& )*maskS(i,j,k,bi,bj) |
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gVNm1(i,j,k,bi,bj)=gV(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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C Step forward temperature |
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DO k=1,Nz |
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DO j=jMin,jMax |
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DO i=iMin,iMax |
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theta(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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gTNm1(i,j,k,bi,bj)=gT(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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_BARRIER |
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C CALL PLOT_FIELD_XYZR8( uVel, 'TIEMSTEP.1 uVel',Nz,1,myThid) |
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C CALL PLOT_FIELD_XYZR8( vVel, 'TIEMSTEP.1 vVel',Nz,1,myThid) |
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C CALL PLOT_FIELD_XYZR8( theta, 'TIEMSTEP.1 theta',Nz,1,myThid) |
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RETURN |
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END |
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