/[MITgcm]/MITgcm/pkg/seaice/SEAICE_OPTIONS.h
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revision 1.25 by dimitri, Wed Jul 18 22:53:34 2007 UTC revision 1.38 by dimitri, Mon Mar 1 23:46:13 2010 UTC
# Line 24  C     Sea-ice dynamics can also be turne Line 24  C     Sea-ice dynamics can also be turne
24  C     using variable SEAICEuseDYNAMICS.  C     using variable SEAICEuseDYNAMICS.
25  #define SEAICE_ALLOW_DYNAMICS  #define SEAICE_ALLOW_DYNAMICS
26    
 C--   By default, pkg/seaice defines forcing variable internally, in  
 C     SEAICE_FFIELDS.h, and reads them in from files.  When CPP option  
 C     SEAICE_EXTERNAL_FORCING is defined, the above forcing variables  
 C     are defined and provided by an external package.  At present this  
 C     option is hardwired for pkg/exf and the variables are passed using  
 C     include file EXF_FIELDS.h (=> cannot be defined without pkg/EXF )  
 #define SEAICE_EXTERNAL_FORCING  
 #ifndef ALLOW_EXF  
 # undef SEAICE_EXTERNAL_FORCING  
 #endif  
   
 #ifdef  SEAICE_EXTERNAL_FORCING  
 #  include "EXF_OPTIONS.h"  
27  C--   By default, the sea-ice package uses its own integrated bulk  C--   By default, the sea-ice package uses its own integrated bulk
28  C     formulae to compute fluxes (fu, fv, EmPmR, Qnet, and Qsw) over  C     formulae to compute fluxes (fu, fv, EmPmR, Qnet, and Qsw) over
29  C     open-ocean.  When this flag is set, these variables are computed  C     open-ocean.  When this flag is set, these variables are computed
30  C     in a separate external package, for example, pkg/exf, and then  C     in a separate external package, for example, pkg/exf, and then
31  C     modified for sea-ice effects by pkg/seaice.  C     modified for sea-ice effects by pkg/seaice.
32  # define SEAICE_EXTERNAL_FLUXES  #define SEAICE_EXTERNAL_FLUXES
   
 #else  /* SEAICE_EXTERNAL_FORCING */  
 C-    current implementation requires those options to be set:  
 # undef  SEAICE_EXTERNAL_FLUXES  
 # define ALLOW_ATM_TEMP  
 # define ALLOW_DOWNWARD_RADIATION  
 # define ALLOW_RUNOFF  
   
 #endif /* SEAICE_EXTERNAL_FORCING */  
   
 #ifdef ALLOW_OBCS  
 C- OBCS information is needed to define the correct sea ice mask.  
 #include "OBCS_OPTIONS.h"  
 #endif /* ALLOW_OBCS */  
33    
34  C--   By default, the sea-ice package uses 2-category thermodynamics.  C--   By default, the sea-ice package uses 2-category thermodynamics.
35  C     When this flag is set, an 8-category calculation of ice  C     When this flag is set, an 8-category calculation of ice
# Line 67  C     Therefore it is not possible to sw Line 40  C     Therefore it is not possible to sw
40  C     in the middle of an integration.  C     in the middle of an integration.
41  #undef SEAICE_MULTICATEGORY  #undef SEAICE_MULTICATEGORY
42    
 C--   By default cdm wind stress under sea-ice is set to the  
 C     same value as it would be if there was no sea-ice.  
 C     This is a placeholder until a more physically-sensible  
 C     stable solution is developed.  Apparently ocean stress  
 C     that is based on sea-ice velocity can cause trouble in  
 C     Arctic Ocean configurations.  This temporary solution  
 C     also corresponds to that adopted by CCSM-2.  For the  
 C     adventurous user who requires ice-modified stress,  
 C     following options are available.  
 #undef SEAICE_ORIGINAL_BAD_ICE_STRESS  
 #undef SEAICE_TEST_ICE_STRESS_1  
   
43  C--   By default the freezing point of water is set to the value of  C--   By default the freezing point of water is set to the value of
44  C     the parameter SEAICE_freeze (=-1.96 by default). To use a  C     the parameter SEAICE_freeze (=-1.96 by default). To use a
45  C     simple linear dependence of the freezing point on salinity,  C     simple linear dependence of the freezing point on salinity,
# Line 88  C     option defined the parameter SEAIC Line 49  C     option defined the parameter SEAIC
49  #undef SEAICE_VARIABLE_FREEZING_POINT  #undef SEAICE_VARIABLE_FREEZING_POINT
50    
51  C--   Allow SEAICEuseFlooding, which converts snow to ice if submerged.  C--   Allow SEAICEuseFlooding, which converts snow to ice if submerged.
52  #undef ALLOW_SEAICE_FLOODING  #define ALLOW_SEAICE_FLOODING
53    
54    C--   By default sea ice is fresh.  Set following flag for salty ice.
55    #undef SEAICE_SALINITY
56    
57    C--   Track sea ice age.
58    #undef SEAICE_AGE
59    
60  C--   By default the seaice model is discretized on a B-Grid (for  C--   By default the seaice model is discretized on a B-Grid (for
61  C     historical reasons). Define the following flag to use a new  C     historical reasons). Define the following flag to use a new
62  C     (not thoroughly) test version on a C-grid  C     (not thoroughly) test version on a C-grid
63  #define SEAICE_CGRID  #define SEAICE_CGRID
64    
65  C--   Only for the C-grid version it is possible to enable EVP code by  C--   Only for the C-grid version it is possible to
 C     defining the following flag  
66  #ifdef SEAICE_CGRID  #ifdef SEAICE_CGRID
67  #define SEAICE_ALLOW_EVP  C     enable EVP code by defining the following flag
68    # define SEAICE_ALLOW_EVP
69    # ifdef SEAICE_ALLOW_EVP
70    C--   When set use SEAICE_zetaMin and SEAICE_evpDampC to limit
71    C--   viscosities from below and above in seaice_evp
72    C--   not necessary, and not recommended
73    #  undef SEAICE_ALLOW_CLIPZETA
74    # endif /* SEAICE_ALLOW_EVP */
75    C     allow the truncated ellipse rheology (runtime flag SEAICEuseTEM)
76    # undef SEAICE_ALLOW_TEM
77    #else /* not SEAICE_CGRID, but old B-grid */
78    C--   By default for B-grid dynamics solver wind stress under sea-ice is
79    C     set to the same value as it would be if there was no sea-ice.
80    C     Define following CPP flag for B-grid ice-ocean stress coupling.
81    # define SEAICE_BICE_STRESS
82    
83    C--   By default for B-grid dynamics solver surface tilt is obtained
84    C     indirectly via geostrophic velocities. Define following CPP
85    C     in order to use ETAN instead.
86    # define EXPLICIT_SSH_SLOPE
87  #endif /* SEAICE_CGRID */  #endif /* SEAICE_CGRID */
88    
89  C--   When set use MAX_HEFF to cap sea ice thickness in seaice_growth  C--   When set use MAX_HEFF to cap sea ice thickness in seaice_growth
90  #undef SEAICE_CAP_HEFF  #undef SEAICE_CAP_HEFF
91    C--   When set use SEAICE_clipVelocties = .true., to clip U/VICE at 40cm/s,
92    C--   not recommended
93    #undef SEAICE_ALLOW_CLIPVELS
94    
95  #endif /* SEAICE_OPTIONS_H */  #endif /* SEAICE_OPTIONS_H */
96    
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