pkg/generic_advdiff/gad_diff_r.F

C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_diff_r.F,v 1.1 2001/05/30 19:34:48 adcroft 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 vertical flux due to down-gradient diffusion of a tracer:
C \begin{equation*}
C F^r_{diff} = - \kappa_r \partial_r \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,Nr)
      _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

      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,k)*recip_drC(k)
     &     *(Tracer(i,j,km1,bi,bj)-Tracer(i,j,k,bi,bj))*rkFac
        ENDDO
       ENDDO
      ENDIF

      RETURN
      END
1	C $Header: /u/gcmpack/models/MITgcmUV/pkg/generic_advdiff/gad_diff_r.F,v 1.1 2001/05/30 19:34:48 adcroft 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 vertical flux due to down-gradient diffusion of a tracer:
19	C \begin{equation*}
20	C F^r_{diff} = - \kappa_r \partial_r \theta
21	C \end{equation*}
22
23	C !USES: ===============================================================
24	IMPLICIT NONE
25	#include "SIZE.h"
26	#include "GRID.h"
27	#include "EEPARAMS.h"
28	#include "PARAMS.h"
29
30	C !INPUT PARAMETERS: ===================================================
31	C bi,bj :: tile indices
32	C k :: vertical level
33	C KappaR :: vertical diffusivity
34	C tracer :: tracer field
35	C myThid :: thread number
36	INTEGER bi,bj,k
37	_RL KappaR(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr)
38	_RL tracer(1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr,nSx,nSy)
39	INTEGER myThid
40
41	C !OUTPUT PARAMETERS: ==================================================
42	C dfr :: vertical diffusive flux
43	_RL dfr (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
44
45	C !LOCAL VARIABLES: ====================================================
46	C i,j :: loop indices
47	C km1 :: =k+1 for k<Nr, =Nr for k>-Nr
48	INTEGER i,j,km1
49
50	km1=max(1,k-1)
51
52	IF (k.eq.1 .OR. k.gt.Nr) THEN
53	DO j=1-Oly,sNy+Oly
54	DO i=1-Olx,sNx+Olx
55	dfr(i,j) = 0.
56	ENDDO
57	ENDDO
58	ELSE
59	DO j=1-Oly,sNy+Oly
60	DO i=1-Olx,sNx+Olx
61	dfr(i,j) =
62	& -_rA(i,j,bi,bj)
63	& KappaR(i,j,k)recip_drC(k)
64	& (Tracer(i,j,km1,bi,bj)-Tracer(i,j,k,bi,bj))rkFac
65	ENDDO
66	ENDDO
67	ENDIF
68
69	RETURN
70	END