pkg/generic_advdiff/gad_u3_adv_x.F

C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_u3_adv_x.F,v 1.1 2001/07/12 00:31:59 jmc Exp $
C $Name:  $

#include "GAD_OPTIONS.h"

      SUBROUTINE GAD_U3_ADV_X( 
     I           bi,bj,k,
     I           uTrans,
     I           tracer,
     O           uT,
     I           myThid )
C     /==========================================================\
C     | SUBROUTINE GAD_U3_ADV_X                                  |
C     | o Compute Zonal advective Flux of Tracer using           |
C     |   3rd Order Upwind Scheme                                |
C     | o reduced to 2nd or 3rd Order near a boundary            |
C     |==========================================================|
      IMPLICIT NONE

C     == GLobal variables ==
#include "SIZE.h"
#include "GRID.h"
#include "GAD.h"

C     == Routine arguments ==
      INTEGER bi,bj,k
      _RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL uT    (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      INTEGER myThid

C     == Local variables ==
      INTEGER i,j
      _RL Rjm,Rj,Rjp,Rjjm,Rjjp

      DO j=1-Oly,sNy+Oly
       uT(1-Olx,j)=0.
       uT(2-Olx,j)=0.
       uT(sNx+Olx,j)=0.
       DO i=1-Olx+2,sNx+Olx-1
        Rjp=(tracer(i+1,j)-tracer(i,j))
c    &     *maskW(i+1,j,k,bi,bj)
        Rj =(tracer(i,j)-tracer(i-1,j))
c    &     *maskW(i,j,k,bi,bj)
        Rjm=(tracer(i-1,j)-tracer(i-2,j))
c    &     *maskW(i-1,j,k,bi,bj)
C- jmc: mask not needed here above if Rjjp & Rjjm & uTrans are masked
        Rjjp=(Rjp-Rj)*maskW(i+1,j,k,bi,bj)
        Rjjm=(Rj-Rjm)*maskW(i-1,j,k,bi,bj)
        uT(i,j) = 
     &   uTrans(i,j)*(
     &     Tracer(i,j)+Tracer(i-1,j)-oneSixth*( Rjjp+Rjjm )
     &               )*0.5 _d 0
     &  +ABS( uTrans(i,j) )*0.5 _d 0*oneSixth*( Rjjp-Rjjm )
       ENDDO
      ENDDO

      RETURN
      END
1	jmc	1.2	C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_u3_adv_x.F,v 1.1 2001/07/12 00:31:59 jmc Exp $
2	jmc	1.1	C $Name: $
3
4			#include "GAD_OPTIONS.h"
5
6			SUBROUTINE GAD_U3_ADV_X(
7			I bi,bj,k,
8			I uTrans,
9			I tracer,
10			O uT,
11			I myThid )
12			C /==========================================================\
13			C \| SUBROUTINE GAD_U3_ADV_X \|
14			C \| o Compute Zonal advective Flux of Tracer using \|
15			C \| 3rd Order Upwind Scheme \|
16	jmc	1.2	C \| o reduced to 2nd or 3rd Order near a boundary \|
17	jmc	1.1	C \|==========================================================\|
18			IMPLICIT NONE
19
20			C == GLobal variables ==
21			#include "SIZE.h"
22			#include "GRID.h"
23			#include "GAD.h"
24
25			C == Routine arguments ==
26			INTEGER bi,bj,k
27			_RL uTrans(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
28			_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
29			_RL uT (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
30			INTEGER myThid
31
32			C == Local variables ==
33			INTEGER i,j
34			_RL Rjm,Rj,Rjp,Rjjm,Rjjp
35
36			DO j=1-Oly,sNy+Oly
37			uT(1-Olx,j)=0.
38			uT(2-Olx,j)=0.
39			uT(sNx+Olx,j)=0.
40			DO i=1-Olx+2,sNx+Olx-1
41	jmc	1.2	Rjp=(tracer(i+1,j)-tracer(i,j))
42			c & *maskW(i+1,j,k,bi,bj)
43			Rj =(tracer(i,j)-tracer(i-1,j))
44			c & *maskW(i,j,k,bi,bj)
45			Rjm=(tracer(i-1,j)-tracer(i-2,j))
46			c & *maskW(i-1,j,k,bi,bj)
47			C- jmc: mask not needed here above if Rjjp & Rjjm & uTrans are masked
48			Rjjp=(Rjp-Rj)*maskW(i+1,j,k,bi,bj)
49			Rjjm=(Rj-Rjm)*maskW(i-1,j,k,bi,bj)
50	jmc	1.1	uT(i,j) =
51			& uTrans(i,j)*(
52			& Tracer(i,j)+Tracer(i-1,j)-oneSixth*( Rjjp+Rjjm )
53			& )*0.5 _d 0
54			& +ABS( uTrans(i,j) )0.5 _d 0oneSixth*( Rjjp-Rjjm )
55			ENDDO
56			ENDDO
57
58			RETURN
59			END