natl_12/code/gad_diff_y.F

C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_y.F,v 1.3 2001/09/21 13:11:43 adcroft Exp $
C $Name: checkpoint51c_post $

#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
      _RS     gridScalingAh
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
        gridScalingAh = (_dyC(i,j,bi,bj)**2)/(5000.**2)
        dfy(i,j) = -diffKh*yA(i,j)
     &      *_recip_dyC(i,j,bi,bj)
     &      *(Tracer(i,j)-Tracer(i,j-1))
     &      *gridScalingAh
#ifdef ISOTROPIC_COS_SCALING
     &      *CosFacV(j,bi,bj)
#endif
       ENDDO
      ENDDO

      RETURN
      END
1	C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_y.F,v 1.3 2001/09/21 13:11:43 adcroft Exp $
2	C $Name: checkpoint51c_post $
3
4	#include "GAD_OPTIONS.h"
5
6	CBOP
7	C !ROUTINE: GAD_DIFF_Y
8
9	C !INTERFACE: ==========================================================
10	SUBROUTINE GAD_DIFF_Y(
11	I bi,bj,k,
12	I yA, 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
29	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	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	INTEGER myThid
41
42	C !OUTPUT PARAMETERS: ==================================================
43	C dfx :: meridional diffusive flux
44	_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45
46	C !LOCAL VARIABLES: ====================================================
47	C i,j :: loop indices
48	INTEGER i,j
49	_RS gridScalingAh
50	CEOP
51
52	DO i=1-Olx,sNx+Olx
53	dfy(i,1-Oly)=0.
54	ENDDO
55	DO j=1-Oly+1,sNy+Oly
56	DO i=1-Olx,sNx+Olx
57	gridScalingAh = (_dyC(i,j,bi,bj)2)/(5000.2)
58	dfy(i,j) = -diffKh*yA(i,j)
59	& *_recip_dyC(i,j,bi,bj)
60	& *(Tracer(i,j)-Tracer(i,j-1))
61	& *gridScalingAh
62	#ifdef ISOTROPIC_COS_SCALING
63	& *CosFacV(j,bi,bj)
64	#endif
65	ENDDO
66	ENDDO
67
68	RETURN
69	END