pkg/cheapaml/gad_diff_2d_y.F

C $Header: /u/gcmpack/MITgcm/pkg/cheapaml/gad_diff_2d_y.F,v 1.1 2008/08/05 21:49:31 jmc Exp $
C $Name:  $

#include "GAD_OPTIONS.h"

CBOP
C !ROUTINE: GAD_DIFF_Y

C !INTERFACE: ==========================================================
      SUBROUTINE GAD_DIFF_2d_Y(
     I           bi,bj,
     I           diffKh,
     I           tracer,
     O           dfy,
     I           myThid )

C !DESCRIPTION:
C Calculates the area integrated meridional flux due to down-gradient
C diffusion of a tracer:
C \begin{equation*}
C F^y_{diff} = - A^y \kappa_h \frac{1}{\Delta y_c} \delta_j \theta
C \end{equation*}

C !USES: ===============================================================
      IMPLICIT NONE
#include "SIZE.h"
#include "GRID.h"
#include "EEPARAMS.h"

C !INPUT PARAMETERS: ===================================================
C  bi,bj                :: tile indices
C  diffKh               :: horizontal diffusivity
C  tracer               :: tracer field
C  myThid               :: thread number
      INTEGER bi,bj,k,jG
      _RL diffKh
      _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      INTEGER myThid

C !OUTPUT PARAMETERS: ==================================================
C  dfx                  :: meridional diffusive flux
      _RL dfy   (1-OLx:sNx+OLx,1-OLy:sNy+OLy)

C !LOCAL VARIABLES: ====================================================
C  i,j                  :: loop indices
      INTEGER i,j
CEOP

      DO i=1-Olx,sNx+Olx
       dfy(i,1-Oly)=0.
      ENDDO
      DO j=1-Oly+1,sNy+Oly
       DO i=1-Olx,sNx+Olx
        dfy(i,j) = -diffKh
     &      *_recip_dyC(i,j,bi,bj)
     &      *(Tracer(i,j)-Tracer(i,j-1))
#ifdef ISOTROPIC_COS_SCALING
     &      *CosFacV(j,bi,bj)
#endif
                  jG = myYGlobalLo-1+(bj-1)*sNy+j
        if(jG.eq.ny.or.jG.eq.1)dfy(i,j)=0.d0
       ENDDO
      ENDDO

      RETURN
      END
1	jmc	1.2	C $Header: /u/gcmpack/MITgcm/pkg/cheapaml/gad_diff_2d_y.F,v 1.1 2008/08/05 21:49:31 jmc Exp $
2	jmc	1.1	C $Name: $
3
4			#include "GAD_OPTIONS.h"
5
6			CBOP
7			C !ROUTINE: GAD_DIFF_Y
8
9			C !INTERFACE: ==========================================================
10	jmc	1.2	SUBROUTINE GAD_DIFF_2d_Y(
11	jmc	1.1	I bi,bj,
12			I diffKh,
13			I tracer,
14			O dfy,
15			I myThid )
16
17			C !DESCRIPTION:
18			C Calculates the area integrated meridional flux due to down-gradient
19			C diffusion of a tracer:
20			C \begin{equation*}
21			C F^y_{diff} = - A^y \kappa_h \frac{1}{\Delta y_c} \delta_j \theta
22			C \end{equation*}
23
24			C !USES: ===============================================================
25			IMPLICIT NONE
26			#include "SIZE.h"
27			#include "GRID.h"
28			#include "EEPARAMS.h"
29
30			C !INPUT PARAMETERS: ===================================================
31			C bi,bj :: tile indices
32			C diffKh :: horizontal diffusivity
33			C tracer :: tracer field
34			C myThid :: thread number
35			INTEGER bi,bj,k,jG
36			_RL diffKh
37			_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
38			INTEGER myThid
39
40			C !OUTPUT PARAMETERS: ==================================================
41			C dfx :: meridional diffusive flux
42			_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
43
44			C !LOCAL VARIABLES: ====================================================
45			C i,j :: loop indices
46			INTEGER i,j
47			CEOP
48
49			DO i=1-Olx,sNx+Olx
50			dfy(i,1-Oly)=0.
51			ENDDO
52			DO j=1-Oly+1,sNy+Oly
53			DO i=1-Olx,sNx+Olx
54			dfy(i,j) = -diffKh
55			& *_recip_dyC(i,j,bi,bj)
56			& *(Tracer(i,j)-Tracer(i,j-1))
57			#ifdef ISOTROPIC_COS_SCALING
58			& *CosFacV(j,bi,bj)
59			#endif
60			jG = myYGlobalLo-1+(bj-1)*sNy+j
61	jmc	1.2	if(jG.eq.ny.or.jG.eq.1)dfy(i,j)=0.d0
62	jmc	1.1	ENDDO
63			ENDDO
64
65			RETURN
66			END