pkg/generic_advdiff/gad_diff_y.F

C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_diff_y.F,v 1.1 2001/05/30 19:34:48 adcroft Exp $
C $Name:  $

#include "GAD_OPTIONS.h"

CBOP
C !ROUTINE: GAD_DIFF_Y

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

C !DESCRIPTION:
C Calculates the meridional flux due to down-gradient diffusion of a tracer:
C \begin{equation*}
C F^y_{diff} = - \kappa_h \partial_y \theta
C \end{equation*}

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

C !INPUT PARAMETERS: ===================================================
C  bi,bj                :: tile indices
C  k                    :: vertical level
C  yA                   :: area of face at V points
C  diffKh               :: horizontal diffusivity
C  tracer               :: tracer field
C  myThid               :: thread number
      INTEGER bi,bj,k
      _RS yA    (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _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*yA(i,j)
     &      *_recip_dyC(i,j,bi,bj)
     &      *(Tracer(i,j)-Tracer(i,j-1))
#ifdef ISOTROPIC_COS_SCALING
     &      *CosFacV(j,bi,bj)
#endif
       ENDDO
      ENDDO

      RETURN
      END
1	adcroft	1.2	C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_diff_y.F,v 1.1 2001/05/30 19:34:48 adcroft Exp $
2			C $Name: $
3	adcroft	1.1
4			#include "GAD_OPTIONS.h"
5
6	adcroft	1.2	CBOP
7			C !ROUTINE: GAD_DIFF_Y
8
9			C !INTERFACE: ==========================================================
10	adcroft	1.1	SUBROUTINE GAD_DIFF_Y(
11			I bi,bj,k,
12			I yA, diffKh,
13			I tracer,
14			O dfy,
15			I myThid )
16	adcroft	1.2
17			C !DESCRIPTION:
18			C Calculates the meridional flux due to down-gradient diffusion of a tracer:
19			C \begin{equation*}
20			C F^y_{diff} = - \kappa_h \partial_y \theta
21			C \end{equation*}
22
23			C !USES: ===============================================================
24	adcroft	1.1	IMPLICIT NONE
25			#include "SIZE.h"
26			#include "GRID.h"
27
28	adcroft	1.2	C !INPUT PARAMETERS: ===================================================
29			C bi,bj :: tile indices
30			C k :: vertical level
31			C yA :: area of face at V points
32			C diffKh :: horizontal diffusivity
33			C tracer :: tracer field
34			C myThid :: thread number
35	adcroft	1.1	INTEGER bi,bj,k
36			_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
37			_RL diffKh
38			_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
39	adcroft	1.2	INTEGER myThid
40
41			C !OUTPUT PARAMETERS: ==================================================
42			C dfx :: meridional diffusive flux
43	adcroft	1.1	_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
44
45	adcroft	1.2	C !LOCAL VARIABLES: ====================================================
46			C i,j :: loop indices
47	adcroft	1.1	INTEGER i,j
48	adcroft	1.2	CEOP
49	adcroft	1.1
50			DO i=1-Olx,sNx+Olx
51			dfy(i,1-Oly)=0.
52			ENDDO
53			DO j=1-Oly+1,sNy+Oly
54			DO i=1-Olx,sNx+Olx
55			dfy(i,j) = -diffKh*yA(i,j)
56			& *_recip_dyC(i,j,bi,bj)
57			& *(Tracer(i,j)-Tracer(i,j-1))
58			#ifdef ISOTROPIC_COS_SCALING
59			& *CosFacV(j,bi,bj)
60			#endif
61			ENDDO
62			ENDDO
63
64			RETURN
65			END