1 |
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 |
|
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 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 |
IMPLICIT NONE |
25 |
#include "SIZE.h" |
26 |
#include "GRID.h" |
27 |
|
28 |
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 |
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 |
INTEGER myThid |
40 |
|
41 |
C !OUTPUT PARAMETERS: ================================================== |
42 |
C dfx :: meridional diffusive flux |
43 |
_RL dfy (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
44 |
|
45 |
C !LOCAL VARIABLES: ==================================================== |
46 |
C i,j :: loop indices |
47 |
INTEGER i,j |
48 |
CEOP |
49 |
|
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 |