1 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_diffusion.F,v 1.1 2006/02/16 10:41:48 mlosch Exp $ |
2 |
C $Name: $ |
3 |
|
4 |
#include "SEAICE_OPTIONS.h" |
5 |
|
6 |
CStartOfInterface |
7 |
SUBROUTINE SEAICE_DIFFUSION( |
8 |
U HEFF, |
9 |
I HEFFM, DELTT, myTime, myIter, myThid ) |
10 |
C /==========================================================\ |
11 |
C | SUBROUTINE advect | |
12 |
C | o Calculate ice advection | |
13 |
C |==========================================================| |
14 |
C \==========================================================/ |
15 |
IMPLICIT NONE |
16 |
|
17 |
C === Global variables === |
18 |
#include "SIZE.h" |
19 |
#include "EEPARAMS.h" |
20 |
#include "PARAMS.h" |
21 |
#include "GRID.h" |
22 |
#include "SEAICE_PARAMS.h" |
23 |
CML#include "SEAICE_GRID.h" |
24 |
|
25 |
#ifdef ALLOW_AUTODIFF_TAMC |
26 |
# include "tamc.h" |
27 |
#endif |
28 |
|
29 |
C === Routine arguments === |
30 |
C myThid - Thread no. that called this routine. |
31 |
_RL HEFF (1-OLx:sNx+OLx,1-OLy:sNy+OLy,3,nSx,nSy) |
32 |
_RL HEFFM (1-OLx:sNx+OLx,1-OLy:sNy+OLy, nSx,nSy) |
33 |
_RL DELTT |
34 |
_RL myTime |
35 |
INTEGER myIter |
36 |
INTEGER myThid |
37 |
CEndOfInterface |
38 |
|
39 |
C === Local variables === |
40 |
C i,j,k,bi,bj - Loop counters |
41 |
|
42 |
INTEGER i, j, bi, bj |
43 |
|
44 |
_RL DIFFA(1-OLx:sNx+OLx, 1-OLy:sNy+OLy,nSx,nSy) |
45 |
|
46 |
#ifdef ALLOW_AUTODIFF_TAMC |
47 |
CADJ STORE heff = comlev1, key = ikey_dynamics |
48 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
49 |
|
50 |
|
51 |
C-- This would be the natural way to do diffusion (explicitly) |
52 |
C For now we stick to the modified Eulerian time step |
53 |
CML DO bj=myByLo(myThid),myByHi(myThid) |
54 |
CML DO bi=myBxLo(myThid),myBxHi(myThid) |
55 |
CML CALL GAD_DIFF_X(bi,bj,k,xA,diff1,localT,df,myThid) |
56 |
CML DO j=1-Oly,sNy+Oly |
57 |
CML DO i=1-Olx,sNx+Olx |
58 |
CML fZon(i,j) = fZon(i,j) + df(i,j) |
59 |
CML ENDDO |
60 |
CML ENDDO |
61 |
CML CALL GAD_DIFF_Y(bi,bj,k,yA,diff1,localT,df,myThid) |
62 |
CML DO j=1-Oly,sNy+Oly |
63 |
CML DO i=1-Olx,sNx+Olx |
64 |
CML fMer(i,j) = fMer(i,j) + df(i,j) |
65 |
CML ENDDO |
66 |
CML ENDDO |
67 |
CMLC-- Divergence of fluxes: update scalar field |
68 |
CML DO j=1-Oly,sNy+Oly-1 |
69 |
CML DO i=1-Olx,sNx+Olx-1 |
70 |
CML HEFF(i,j,1,bi,bj)=HEFF(i,j,1,bi,bj) + DELTT * |
71 |
CML & maskC(i,j,kSurface,bi,bj)*recip_rA(i,j,bi,bj) |
72 |
CML & *( (fZon(i+1,j)-fZon(i,j)) |
73 |
CML & +(fMer(i,j+1)-fMer(i,j)) |
74 |
CML & ) |
75 |
CML & ) |
76 |
CML ENDDO |
77 |
CML ENDDO |
78 |
CML ENDDO |
79 |
CML ENDDO |
80 |
|
81 |
C NOW DO DIFFUSION ON H(I,J,3) |
82 |
C NOW CALCULATE DIFFUSION COEF ROUGHLY |
83 |
DO bj=myByLo(myThid),myByHi(myThid) |
84 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
85 |
DO j=1-OLy,sNy+OLy |
86 |
DO i=1-OLx,sNx+OLx |
87 |
DIFFA(I,J,bi,bj)= |
88 |
& DIFF1*MIN( _dxF(I,J,bi,bj), _dyF(I,J,bi,bj)) |
89 |
ENDDO |
90 |
ENDDO |
91 |
ENDDO |
92 |
ENDDO |
93 |
CALL DIFFUS(HEFF,DIFFA,HEFFM,DELTT, myThid) |
94 |
|
95 |
DO bj=myByLo(myThid),myByHi(myThid) |
96 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
97 |
DO j=1-OLy,sNy+OLy |
98 |
DO i=1-OLx,sNx+OLx |
99 |
HEFF(I,J,1,bi,bj)=(HEFF(I,J,1,bi,bj)+HEFF(I,J,3,bi,bj)) |
100 |
& *HEFFM(I,J,bi,bj) |
101 |
ENDDO |
102 |
ENDDO |
103 |
ENDDO |
104 |
ENDDO |
105 |
|
106 |
C NOW CALCULATE DIFFUSION COEF ROUGHLY |
107 |
DO bj=myByLo(myThid),myByHi(myThid) |
108 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
109 |
DO j=1-OLy,sNy+OLy |
110 |
DO i=1-OLx,sNx+OLx |
111 |
DIFFA(I,J,bi,bj)= |
112 |
& -(MIN( _dxF(I,J,bi,bj), _dyF(I,J,bi,bj)))**2/DELTT |
113 |
ENDDO |
114 |
ENDDO |
115 |
ENDDO |
116 |
ENDDO |
117 |
CALL DIFFUS(HEFF,DIFFA,HEFFM,DELTT, myThid) |
118 |
|
119 |
DO bj=myByLo(myThid),myByHi(myThid) |
120 |
DO bi=myBxLo(myThid),myBxHi(myThid) |
121 |
DO j=1-OLy,sNy+OLy |
122 |
DO i=1-OLx,sNx+OLx |
123 |
HEFF(I,J,1,bi,bj)=(HEFF(I,J,1,bi,bj)+HEFF(I,J,3,bi,bj)) |
124 |
& *HEFFM(I,J,bi,bj) |
125 |
ENDDO |
126 |
ENDDO |
127 |
ENDDO |
128 |
ENDDO |
129 |
|
130 |
RETURN |
131 |
END |