model/src/timestep.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep.F,v 1.8 1998/06/01 22:27:14 adcroft Exp $

#include "CPP_EEOPTIONS.h"

C     /==========================================================\
C     | S/R TIMESTEP                                             |
C     | o Step model fields forward in time                      |
C     \==========================================================/
      SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax,
     I                     K,
     I                     myThid )
      implicit none
! Common
#include "SIZE.h"
#include "DYNVARS.h"
#include "PARAMS.h"
#include "GRID.h"
C     == Routine Arguments ==
      INTEGER bi,bj,iMin,iMax,jMin,jMax
      INTEGER K
      INTEGER myThid
C     == Local variables ==
      INTEGER i,j
      _RL ab15,ab05

C     Adams-Bashforth timestepping weights
      ab15=1.5+abeps
      ab05=-0.5-abeps

C     Step forward zonal velocity (store in Gu)
       DO j=jMin,jMax
        DO i=iMin,iMax
         gUNm1(i,j,k,bi,bj)=uVel(i,j,k,bi,bj)
     &    +deltaTmom*(ab15*gU(i,j,k,bi,bj)+ab05*gUNm1(i,j,k,bi,bj)
#ifdef ALLOW_CD
     &    +guCD(i,j,k,bi,bj)
#endif
     &        )*_maskW(i,j,k,bi,bj)
        ENDDO
       ENDDO
C     Step forward meridional velocity (store in Gv)
       DO j=jMin,jMax
        DO i=iMin,iMax
         gVNm1(i,j,k,bi,bj)=vVel(i,j,k,bi,bj)
     &    +deltaTmom*(ab15*gV(i,j,k,bi,bj)+ab05*gVNm1(i,j,k,bi,bj)
#ifdef ALLOW_CD
     &    +gvCD(i,j,k,bi,bj)
#endif
     &        )*_maskS(i,j,k,bi,bj)
        ENDDO
       ENDDO
C     Step forward temperature
       DO j=jMin,jMax
        DO i=iMin,iMax
         theta(i,j,k,bi,bj)=theta(i,j,k,bi,bj)
     &    +deltaTtracer*(ab15*gT(i,j,k,bi,bj)+ab05*gTNm1(i,j,k,bi,bj))
         gTNm1(i,j,k,bi,bj)=gT(i,j,k,bi,bj)
        ENDDO
       ENDDO

      RETURN
      END
1	C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep.F,v 1.8 1998/06/01 22:27:14 adcroft Exp $
2
3	#include "CPP_EEOPTIONS.h"
4
5	C /==========================================================\
6	C \| S/R TIMESTEP \|
7	C \| o Step model fields forward in time \|
8	C \==========================================================/
9	SUBROUTINE TIMESTEP( bi, bj, iMin, iMax, jMin, jMax,
10	I K,
11	I myThid )
12	implicit none
13	! Common
14	#include "SIZE.h"
15	#include "DYNVARS.h"
16	#include "PARAMS.h"
17	#include "GRID.h"
18	C == Routine Arguments ==
19	INTEGER bi,bj,iMin,iMax,jMin,jMax
20	INTEGER K
21	INTEGER myThid
22	C == Local variables ==
23	INTEGER i,j
24	_RL ab15,ab05
25
26	C Adams-Bashforth timestepping weights
27	ab15=1.5+abeps
28	ab05=-0.5-abeps
29
30	C Step forward zonal velocity (store in Gu)
31	DO j=jMin,jMax
32	DO i=iMin,iMax
33	gUNm1(i,j,k,bi,bj)=uVel(i,j,k,bi,bj)
34	& +deltaTmom(ab15gU(i,j,k,bi,bj)+ab05*gUNm1(i,j,k,bi,bj)
35	#ifdef ALLOW_CD
36	& +guCD(i,j,k,bi,bj)
37	#endif
38	& )*_maskW(i,j,k,bi,bj)
39	ENDDO
40	ENDDO
41	C Step forward meridional velocity (store in Gv)
42	DO j=jMin,jMax
43	DO i=iMin,iMax
44	gVNm1(i,j,k,bi,bj)=vVel(i,j,k,bi,bj)
45	& +deltaTmom(ab15gV(i,j,k,bi,bj)+ab05*gVNm1(i,j,k,bi,bj)
46	#ifdef ALLOW_CD
47	& +gvCD(i,j,k,bi,bj)
48	#endif
49	& )*_maskS(i,j,k,bi,bj)
50	ENDDO
51	ENDDO
52	C Step forward temperature
53	DO j=jMin,jMax
54	DO i=iMin,iMax
55	theta(i,j,k,bi,bj)=theta(i,j,k,bi,bj)
56	& +deltaTtracer(ab15gT(i,j,k,bi,bj)+ab05*gTNm1(i,j,k,bi,bj))
57	gTNm1(i,j,k,bi,bj)=gT(i,j,k,bi,bj)
58	ENDDO
59	ENDDO
60
61	RETURN
62	END