model/src/timestep_tracer.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep_tracer.F,v 1.7 2001/09/19 02:43:27 adcroft 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,
     O                     gTrNm1,
     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)
      _RL  gTrNm1 (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
      _RL gTrtmp(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
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	cnh	1.8	C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep_tracer.F,v 1.7 2001/09/19 02:43:27 adcroft Exp $
2	adcroft	1.2	C $Name: $
3	adcroft	1.1
4			#include "CPP_OPTIONS.h"
5
6	cnh	1.8	CBOP
7			C !ROUTINE: TIMESTEP_TRACER
8			C !INTERFACE:
9	adcroft	1.2	SUBROUTINE TIMESTEP_TRACER(
10	adcroft	1.4	I bi, bj, iMin, iMax, jMin, jMax, K,
11			I advection_scheme,
12			I tracer, gTracer,
13			O gTrNm1,
14	adcroft	1.2	I myIter, myThid )
15	cnh	1.8	C !DESCRIPTION: \bv
16			C ==========================================================
17			C \| S/R TIMESTEP_TRACER
18			C \| o Step model tracer field forward in time
19			C ==========================================================
20			C \ev
21
22			C !USES:
23	adcroft	1.2	IMPLICIT NONE
24			C == Global variables ===
25	adcroft	1.1	#include "SIZE.h"
26			#include "EEPARAMS.h"
27			#include "PARAMS.h"
28	adcroft	1.4	#include "GAD.h"
29	jmc	1.5	#include "GRID.h"
30			#include "SURFACE.h"
31	adcroft	1.2
32	cnh	1.8	C !INPUT/OUTPUT PARAMETERS:
33	adcroft	1.1	C == Routine Arguments ==
34			INTEGER bi,bj,iMin,iMax,jMin,jMax,K
35	adcroft	1.4	INTEGER advection_scheme
36	adcroft	1.1	_RL tracer (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
37			_RL gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
38			_RL gTrNm1 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
39			INTEGER myIter, myThid
40	cnh	1.8
41			C !LOCAL VARIABLES:
42	adcroft	1.1	C == Local variables ==
43			INTEGER i,j
44			_RL ab15,ab05
45	jmc	1.5	_RL gTrtmp(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
46	cnh	1.8	CEOP
47	adcroft	1.1
48			C Adams-Bashforth timestepping weights
49	adcroft	1.3	IF (myIter .EQ. 0) THEN
50			ab15=1.0
51			ab05=0.0
52			ELSE
53	adcroft	1.4	ab15=1.5+abEps
54			ab05=-(0.5+abEps)
55	adcroft	1.3	ENDIF
56	adcroft	1.1
57	jmc	1.5	C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-\|--+----\|
58
59			C- Step forward tracer
60			DO j=jMin,jMax
61			DO i=iMin,iMax
62	adcroft	1.7	gTracer(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
63			& +deltaTtracer*gTracer(i,j,k,bi,bj)
64	jmc	1.5	ENDDO
65			ENDDO
66	adcroft	1.1
67			RETURN
68			END