model/src/timestep_tracer.F

C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep_tracer.F,v 1.3 2001/07/31 15:01:33 adcroft Exp $
C $Name:  $

#include "CPP_OPTIONS.h"

      SUBROUTINE TIMESTEP_TRACER(
     I                     bi, bj, iMin, iMax, jMin, jMax, K,
     I                     advection_scheme,
     I                     tracer, gTracer,
     O                     gTrNm1,
     I                     myIter, myThid )
C     /==========================================================\
C     | S/R TIMESTEP_TRACER                                      |
C     | o Step model tracer field forward in time                |
C     \==========================================================/
      IMPLICIT NONE

C     == Global variables ===
#include "SIZE.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "GAD.h"

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 ==
      INTEGER i,j
      _RL ab15,ab05

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     Step forward temperature
      IF ( advection_scheme.EQ.ENUM_CENTERED_2ND
     & .OR.advection_scheme.EQ.ENUM_UPWIND_3RD
     & .OR.advection_scheme.EQ.ENUM_CENTERED_4TH ) THEN
       DO j=jMin,jMax
        DO i=iMin,iMax
          gTrNm1(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
     &             +deltaTtracer*(
     &                              ab15*gTracer(i,j,k,bi,bj)
     &                             +ab05*gTrNm1(i,j,k,bi,bj)  )
        ENDDO
       ENDDO
      ELSEIF (advection_scheme.EQ.ENUM_FLUX_LIMIT) THEN
       DO j=jMin,jMax
        DO i=iMin,iMax
          gTrNm1(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
     &             +deltaTtracer*gTracer(i,j,k,bi,bj)
        ENDDO
       ENDDO
      ELSE
       STOP 'TIMESTEP_TRACER: Bad advection_scheme'
      ENDIF

      RETURN
      END
1	adcroft	1.4	C $Header: /u/gcmpack/models/MITgcmUV/model/src/timestep_tracer.F,v 1.3 2001/07/31 15:01:33 adcroft Exp $
2	adcroft	1.2	C $Name: $
3	adcroft	1.1
4			#include "CPP_OPTIONS.h"
5
6	adcroft	1.2	SUBROUTINE TIMESTEP_TRACER(
7	adcroft	1.4	I bi, bj, iMin, iMax, jMin, jMax, K,
8			I advection_scheme,
9			I tracer, gTracer,
10			O gTrNm1,
11	adcroft	1.2	I myIter, myThid )
12	adcroft	1.1	C /==========================================================\
13			C \| S/R TIMESTEP_TRACER \|
14			C \| o Step model tracer field forward in time \|
15			C \==========================================================/
16	adcroft	1.2	IMPLICIT NONE
17
18			C == Global variables ===
19	adcroft	1.1	#include "SIZE.h"
20			#include "EEPARAMS.h"
21			#include "PARAMS.h"
22	adcroft	1.4	#include "GAD.h"
23	adcroft	1.2
24	adcroft	1.1	C == Routine Arguments ==
25			INTEGER bi,bj,iMin,iMax,jMin,jMax,K
26	adcroft	1.4	INTEGER advection_scheme
27	adcroft	1.1	_RL tracer (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
28			_RL gTracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
29			_RL gTrNm1 (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
30			INTEGER myIter, myThid
31			C == Local variables ==
32			INTEGER i,j
33			_RL ab15,ab05
34
35			C Adams-Bashforth timestepping weights
36	adcroft	1.3	IF (myIter .EQ. 0) THEN
37			ab15=1.0
38			ab05=0.0
39			ELSE
40	adcroft	1.4	ab15=1.5+abEps
41			ab05=-(0.5+abEps)
42	adcroft	1.3	ENDIF
43	adcroft	1.1
44			C Step forward temperature
45	adcroft	1.4	IF ( advection_scheme.EQ.ENUM_CENTERED_2ND
46			& .OR.advection_scheme.EQ.ENUM_UPWIND_3RD
47			& .OR.advection_scheme.EQ.ENUM_CENTERED_4TH ) THEN
48			DO j=jMin,jMax
49	adcroft	1.1	DO i=iMin,iMax
50			gTrNm1(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
51			& +deltaTtracer*(
52			& ab15*gTracer(i,j,k,bi,bj)
53			& +ab05*gTrNm1(i,j,k,bi,bj) )
54			ENDDO
55	adcroft	1.4	ENDDO
56			ELSEIF (advection_scheme.EQ.ENUM_FLUX_LIMIT) THEN
57			DO j=jMin,jMax
58			DO i=iMin,iMax
59			gTrNm1(i,j,k,bi,bj)=tracer(i,j,k,bi,bj)
60			& +deltaTtracer*gTracer(i,j,k,bi,bj)
61			ENDDO
62			ENDDO
63			ELSE
64			STOP 'TIMESTEP_TRACER: Bad advection_scheme'
65			ENDIF
66	adcroft	1.1
67			RETURN
68			END