pkg/generic_advdiff/gad_diff_y.F

C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_diff_y.F,v 1.2 2001/09/20 20:07:06 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 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"

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	1.3	C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_diff_y.F,v 1.2 2001/09/20 20:07:06 adcroft Exp $
2	adcroft	1.2	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	adcroft	1.3	C Calculates the area integrated meridional flux due to down-gradient
19			C diffusion of a tracer:
20	adcroft	1.2	C \begin{equation*}
21	adcroft	1.3	C F^y_{diff} = - A^y \kappa_h \frac{1}{\Delta y_c} \delta_j \theta
22	adcroft	1.2	C \end{equation*}
23
24			C !USES: ===============================================================
25	adcroft	1.1	IMPLICIT NONE
26			#include "SIZE.h"
27			#include "GRID.h"
28
29	adcroft	1.2	C !INPUT PARAMETERS: ===================================================
30			C bi,bj :: tile indices
31			C k :: vertical level
32			C yA :: area of face at V points
33			C diffKh :: horizontal diffusivity
34			C tracer :: tracer field
35			C myThid :: thread number
36	adcroft	1.1	INTEGER bi,bj,k
37			_RS yA (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
38			_RL diffKh
39			_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
40	adcroft	1.2	INTEGER myThid
41
42			C !OUTPUT PARAMETERS: ==================================================
43			C dfx :: meridional diffusive flux
44	adcroft	1.1	_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45
46	adcroft	1.2	C !LOCAL VARIABLES: ====================================================
47			C i,j :: loop indices
48	adcroft	1.1	INTEGER i,j
49	adcroft	1.2	CEOP
50	adcroft	1.1
51			DO i=1-Olx,sNx+Olx
52			dfy(i,1-Oly)=0.
53			ENDDO
54			DO j=1-Oly+1,sNy+Oly
55			DO i=1-Olx,sNx+Olx
56			dfy(i,j) = -diffKh*yA(i,j)
57			& *_recip_dyC(i,j,bi,bj)
58			& *(Tracer(i,j)-Tracer(i,j-1))
59			#ifdef ISOTROPIC_COS_SCALING
60			& *CosFacV(j,bi,bj)
61			#endif
62			ENDDO
63			ENDDO
64
65			RETURN
66			END