model/src/timestep_tracer.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep_tracer.F,v 1.8 2001/09/26 18:09:16 cnh Exp $
C $Name:  $

#include "CPP_OPTIONS.h"

CBOP
C     !ROUTINE: TIMESTEP_TRACER
C     !INTERFACE:
      SUBROUTINE TIMESTEP_TRACER(
     I                     bi, bj, iMin, iMax, jMin, jMax, K,
     I                     advection_scheme,
     I                     tracer, gTracer,
     I                     myIter, myThid )
C     !DESCRIPTION: \bv
C     *==========================================================*
C     | S/R TIMESTEP_TRACER                                       
C     | o Step model tracer field forward in time                 
C     *==========================================================*
C     \ev

C     !USES:
      IMPLICIT NONE
C     == Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GAD.h"
#include "GRID.h"
#include "SURFACE.h"

C     !INPUT/OUTPUT PARAMETERS:
C     == Routine Arguments ==
      INTEGER bi,bj,iMin,iMax,jMin,jMax,K
      INTEGER advection_scheme
      _RL  tracer (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      _RL  gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      INTEGER myIter, myThid

C     !LOCAL VARIABLES:
C     == Local variables ==
      INTEGER i,j
      _RL ab15,ab05
CEOP

C     Adams-Bashforth timestepping weights
      IF (myIter .EQ. 0) THEN
       ab15=1.0
       ab05=0.0
      ELSE
       ab15=1.5+abEps
       ab05=-(0.5+abEps)
      ENDIF

C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|

C-    Step forward tracer
      DO j=jMin,jMax
       DO i=iMin,iMax
         gTracer(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
     &            +deltaTtracer*gTracer(i,j,k,bi,bj)
       ENDDO
      ENDDO

      RETURN
      END
1	C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep_tracer.F,v 1.8 2001/09/26 18:09:16 cnh Exp $
2	C $Name: $
3
4	#include "CPP_OPTIONS.h"
5
6	CBOP
7	C !ROUTINE: TIMESTEP_TRACER
8	C !INTERFACE:
9	SUBROUTINE TIMESTEP_TRACER(
10	I bi, bj, iMin, iMax, jMin, jMax, K,
11	I advection_scheme,
12	I tracer, gTracer,
13	I myIter, myThid )
14	C !DESCRIPTION: \bv
15	C ==========================================================
16	C \| S/R TIMESTEP_TRACER
17	C \| o Step model tracer field forward in time
18	C ==========================================================
19	C \ev
20
21	C !USES:
22	IMPLICIT NONE
23	C == Global variables ===
24	#include "SIZE.h"
25	#include "EEPARAMS.h"
26	#include "PARAMS.h"
27	#include "GAD.h"
28	#include "GRID.h"
29	#include "SURFACE.h"
30
31	C !INPUT/OUTPUT PARAMETERS:
32	C == Routine Arguments ==
33	INTEGER bi,bj,iMin,iMax,jMin,jMax,K
34	INTEGER advection_scheme
35	_RL tracer (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
36	_RL gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
37	INTEGER myIter, myThid
38
39	C !LOCAL VARIABLES:
40	C == Local variables ==
41	INTEGER i,j
42	_RL ab15,ab05
43	CEOP
44
45	C Adams-Bashforth timestepping weights
46	IF (myIter .EQ. 0) THEN
47	ab15=1.0
48	ab05=0.0
49	ELSE
50	ab15=1.5+abEps
51	ab05=-(0.5+abEps)
52	ENDIF
53
54	C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-\|--+----\|
55
56	C- Step forward tracer
57	DO j=jMin,jMax
58	DO i=iMin,iMax
59	gTracer(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
60	& +deltaTtracer*gTracer(i,j,k,bi,bj)
61	ENDDO
62	ENDDO
63
64	RETURN
65	END