/[MITgcm]/MITgcm/pkg/seaice/diffus.F
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Annotation of /MITgcm/pkg/seaice/diffus.F

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Revision 1.2 - (hide annotations) (download)
Tue Nov 12 20:47:27 2002 UTC (21 years, 6 months ago) by heimbach
Branch: MAIN
CVS Tags: checkpoint46n_post, checkpoint47a_post, checkpoint47
Changes since 1.1: +83 -0 lines 
Merging from release1_p8 branch:
o New package: pkg/seaice
  Sea ice model by D. Menemenlis (JPL) and Jinlun Zhang (Seattle).
  The sea-ice code is based on Hibler (1979-1980).
  Two sea-ice dynamic solvers, ADI and LSR, are included.
  In addition to computing prognostic sea-ice variables and diagnosing
  the forcing/external data fields that drive the ocean model,
  SEAICE_MODEL also sets theta to the freezing point under sea-ice.
  The implied surface heat flux is then stored in variable
  surfaceTendencyTice, which is needed by KPP package (kpp_calc.F and
  kpp_transport_t.F) to diagnose surface buoyancy fluxes and for the
  non-local transport term.  Because this call precedes model
  thermodynamics, temperature under sea-ice may not be "exactly" at
  the freezing point by the time theta is dumped or time-averaged.
1 heimbach 1.2 C $Header:
2    
3     #include "SEAICE_OPTIONS.h"
4    
5     CStartOfInterface
6     SUBROUTINE diffus( HEFF, DIFFA, HEFFM, DELTT, myThid )
7     C /==========================================================\
8     C | SUBROUTINE diffus |
9     C | o Add diffusion terms to ice mass conservation equations |
10     C |==========================================================|
11     C \==========================================================/
12     IMPLICIT NONE
13    
14     C === Global variables ===
15     #include "SIZE.h"
16     #include "EEPARAMS.h"
17     #include "SEAICE_GRID.h"
18    
19     C === Routine arguments ===
20     C myThid - Thread no. that called this routine.
21     _RL HEFF (1-OLx:sNx+OLx,1-OLy:sNy+OLy,3,nSx,nSy)
22     _RL HEFFM (1-OLx:sNx+OLx,1-OLy:sNy+OLy, nSx,nSy)
23     _RL DIFFA (1-OLx:sNx+OLx,1-OLy:sNy+OLy)
24     _RL DELTT
25     INTEGER myThid
26     CEndOfInterface
27    
28     #ifdef ALLOW_SEAICE
29    
30     C === Local variables ===
31     C i,j,k,bi,bj - Loop counters
32    
33     INTEGER i, j, k, bi, bj
34     _RL DELTXX1, DELTYY1, DELTXX, DELTYY
35     _RL HEFF1 (1-OLx:sNx+OLx, 1-OLy:sNy+OLy)
36    
37     DO bj=myByLo(myThid),myByHi(myThid)
38     DO bi=myBxLo(myThid),myBxHi(myThid)
39    
40     DO j=1-OLy,sNy+OLy
41     DO i=1-OLx,sNx+OLx
42     HEFF1(I,J)=0.0
43     ENDDO
44     ENDDO
45    
46     C NOW DO DIFFUSION WITH NUIT CONVERSION
47     DO j=1,sNy
48     DO i=1,sNx
49     DELTXX1=DELTT*DIFFA(I,J)
50     DELTYY1=DELTT*DIFFA(I,J)
51     DELTXX=DELTXX1/(DXTICE(I,J,bi,bj)*DXTICE(I,J,bi,bj)
52     & *CSTICE(I,J,bi,bj)*CSTICE(I,J,bi,bj))
53     DELTYY=DELTYY1/(DYTICE(I,J,bi,bj)*DYTICE(I,J,bi,bj)
54     & *CSTICE(I,J,bi,bj))
55     HEFF1(I,J)=DELTXX*((HEFF(I+1,J,3,bi,bj)-HEFF(I,J,3,bi,bj))
56     & *HEFFM(I+1,J,bi,bj)
57     & -(HEFF(I,J,3,bi,bj)-HEFF(I-1,J,3,bi,bj))*HEFFM(I-1,J,bi,bj))
58     & +DELTYY*((HEFF(I,J+1,3,bi,bj)-HEFF(I,J,3,bi,bj))
59     & *CSUICE(I,J,bi,bj)*HEFFM(I,J+1,bi,bj)
60     & -(HEFF(I,J,3,bi,bj)-HEFF(I,J-1,3,bi,bj))
61     & *CSUICE(I,J-1,bi,bj)*HEFFM(I,J-1,bi,bj))
62     ENDDO
63     ENDDO
64    
65     ENDDO
66     ENDDO
67    
68     _EXCH_XY_R8(HEFF1, myThid)
69    
70     DO bj=myByLo(myThid),myByHi(myThid)
71     DO bi=myBxLo(myThid),myBxHi(myThid)
72     DO j=1-OLy,sNy+OLy
73     DO i=1-OLx,sNx+OLx
74     HEFF(I,J,3,bi,bj)=HEFF1(I,J)
75     ENDDO
76     ENDDO
77     ENDDO
78     ENDDO
79    
80     #endif ALLOW_SEAICE
81    
82     RETURN
83     END
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