pkg/generic_advdiff/gad_diff_r.F

C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_r.F,v 1.4 2004/10/21 21:26:10 jmc Exp $
C $Name:  $

#include "GAD_OPTIONS.h"

CBOP
C !ROUTINE: GAD_DIFF_R

C !INTERFACE: ==========================================================
      SUBROUTINE GAD_DIFF_R( 
     I           bi,bj,k,
     I           KappaR,
     I           tracer,
     O           dfr,
     I           myThid )

C !DESCRIPTION:
C Calculates the area integrated vertical flux due to down-gradient
C diffusion of a tracer:
C \begin{equation*}
C F^r_{diff} = - A^r \kappa_r \frac{1}{\Delta r_c} \delta_k \theta
C \end{equation*}

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

C !INPUT PARAMETERS: ===================================================
C  bi,bj                :: tile indices
C  k                    :: vertical level
C  KappaR               :: vertical diffusivity
C  tracer               :: tracer field
C  myThid               :: thread number
      INTEGER bi,bj,k
      _RL KappaR(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
      _RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
      INTEGER myThid

C !OUTPUT PARAMETERS: ==================================================
C  dfr                  :: vertical diffusive flux
      _RL dfr   (1-OLx:sNx+OLx,1-OLy:sNy+OLy)

C !LOCAL VARIABLES: ====================================================
C  i,j                  :: loop indices
C  km1                  :: =k+1 for k<Nr, =Nr for k>-Nr
      INTEGER i,j,km1
CEOP

      km1=max(1,k-1)

      IF (k.eq.1 .OR. k.gt.Nr) THEN
       DO j=1-Oly,sNy+Oly
        DO i=1-Olx,sNx+Olx
         dfr(i,j) = 0.
        ENDDO
       ENDDO
      ELSE
       DO j=1-Oly,sNy+Oly
        DO i=1-Olx,sNx+Olx
         dfr(i,j) =
     &    -_rA(i,j,bi,bj)
     &     *KappaR(i,j)*recip_drC(k)
     &     *(Tracer(i,j,k,bi,bj)-Tracer(i,j,km1,bi,bj))*rkSign
        ENDDO
       ENDDO
      ENDIF

      RETURN
      END
1	C $Header: /u/gcmpack/MITgcm/pkg/generic_advdiff/gad_diff_r.F,v 1.4 2004/10/21 21:26:10 jmc Exp $
2	C $Name: $
3
4	#include "GAD_OPTIONS.h"
5
6	CBOP
7	C !ROUTINE: GAD_DIFF_R
8
9	C !INTERFACE: ==========================================================
10	SUBROUTINE GAD_DIFF_R(
11	I bi,bj,k,
12	I KappaR,
13	I tracer,
14	O dfr,
15	I myThid )
16
17	C !DESCRIPTION:
18	C Calculates the area integrated vertical flux due to down-gradient
19	C diffusion of a tracer:
20	C \begin{equation*}
21	C F^r_{diff} = - A^r \kappa_r \frac{1}{\Delta r_c} \delta_k \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	#include "PARAMS.h"
30
31	C !INPUT PARAMETERS: ===================================================
32	C bi,bj :: tile indices
33	C k :: vertical level
34	C KappaR :: vertical diffusivity
35	C tracer :: tracer field
36	C myThid :: thread number
37	INTEGER bi,bj,k
38	_RL KappaR(1-OLx:sNx+OLx,1-OLy:sNy+OLy)
39	_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
40	INTEGER myThid
41
42	C !OUTPUT PARAMETERS: ==================================================
43	C dfr :: vertical diffusive flux
44	_RL dfr (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
45
46	C !LOCAL VARIABLES: ====================================================
47	C i,j :: loop indices
48	C km1 :: =k+1 for k<Nr, =Nr for k>-Nr
49	INTEGER i,j,km1
50	CEOP
51
52	km1=max(1,k-1)
53
54	IF (k.eq.1 .OR. k.gt.Nr) THEN
55	DO j=1-Oly,sNy+Oly
56	DO i=1-Olx,sNx+Olx
57	dfr(i,j) = 0.
58	ENDDO
59	ENDDO
60	ELSE
61	DO j=1-Oly,sNy+Oly
62	DO i=1-Olx,sNx+Olx
63	dfr(i,j) =
64	& -_rA(i,j,bi,bj)
65	& KappaR(i,j)recip_drC(k)
66	& (Tracer(i,j,k,bi,bj)-Tracer(i,j,km1,bi,bj))rkSign
67	ENDDO
68	ENDDO
69	ENDIF
70
71	RETURN
72	END