/[MITgcm]/MITgcm/pkg/seaice/SEAICE_OPTIONS.h
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revision 1.18 by mlosch, Wed Dec 20 12:25:15 2006 UTC revision 1.41 by jmc, Thu Oct 28 23:11:02 2010 UTC
# Line 1  Line 1 
1  C $Header$  C $Header$
2  C $Name$  C $Name$
3    
4  C     /==========================================================\  C     *==========================================================*
5  C     | SEAICE_OPTIONS.h                                         |  C     | SEAICE_OPTIONS.h                                         |
6  C     | o CPP options file for sea ice package.                  |  C     | o CPP options file for sea ice package.                  |
7  C     |==========================================================|  C     *==========================================================*
8  C     | Use this file for selecting options within the sea ice   |  C     | Use this file for selecting options within the sea ice   |
9  C     | package.                                                 |  C     | package.                                                 |
10  C     \==========================================================/  C     *==========================================================*
11    
12  #ifndef SEAICE_OPTIONS_H  #ifndef SEAICE_OPTIONS_H
13  #define SEAICE_OPTIONS_H  #define SEAICE_OPTIONS_H
# 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.  
 #define SEAICE_EXTERNAL_FORCING  
 #ifdef SEAICE_EXTERNAL_FORCING  
 #include "EXF_OPTIONS.h"  
 #endif /* SEAICE_EXTERNAL_FORCING */  
   
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
# Line 51  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    
43  C--   By default cdm wind stress under sea-ice is set to the  C--   Use the Old version of seaice_growth (close to cvs version 1.70)
44  C     same value as it would be if there was no sea-ice.  C     otherwise, use the merged version (with some of Ian Fenty s code)
45  C     This is a placeholder until a more physically-sensible  #undef SEAICE_GROWTH_LEGACY
46  C     stable solution is developed.  Apparently ocean stress  
47  C     that is based on sea-ice velocity can cause trouble in  C--   options only available in the merged version (from Ian Fenty s code)
48  C     Arctic Ocean configurations.  This temporary solution  #ifndef SEAICE_GROWTH_LEGACY
49  C     also corresponds to that adopted by CCSM-2.  For the  C-    to switch on/off open-water freezing contribution to thickness tendency:
50  C     adventurous user who requires ice-modified stress,  #define SEAICE_DO_OPEN_WATER_GROWTH
51  C     following options are available.  C-    to switch on/off ocean heat contribution to seaice cover reduction:
52  #undef SEAICE_ORIGINAL_BAD_ICE_STRESS  #define SEAICE_OCN_MELT_ACT_ON_AREA
53  #undef SEAICE_TEST_ICE_STRESS_1  #endif
54    
55    C--   Use the Old version of seaice_solve4temp (formerly seaice_budget_ice)
56    C     otherwise, use Ian Fenty s version
57    #define SEAICE_SOLVE4TEMP_LEGACY
58    
59  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
60  C     the parameter SEAICE_freeze (=-1.96 by default). To use a  C     the parameter SEAICE_freeze (=-1.96 by default). To use a
61  C     simple linear dependence of the freezing point on salinity,  C     simple linear dependence of the freezing point on salinity,
62  C     set the following flag (pressure is assumed to have no effect,  C     set the following flag (pressure is assumed to have no effect,
63  C     which is a good assumption for the top 20 meters). With this  C     which is a good assumption for the top 20 meters). With this
64  C     option defined the parameter SEAICE_freeze has no effect.  C     option defined the parameter SEAICE_freeze has no effect.
65  #undef SEAICE_VARIABLE_FREEZING_POINT  #undef SEAICE_VARIABLE_FREEZING_POINT
66    
67  C--   By default the seaice model is discretized on a B-Grid (for  C--   Allow SEAICEuseFlooding, which converts snow to ice if submerged.
68    #define ALLOW_SEAICE_FLOODING
69    
70    C--   By default sea ice is fresh.  Set following flag for salty ice.
71    #undef SEAICE_SALINITY
72    
73    C--   Track sea ice age.
74    C     By default sea ice age is associated with ice area.
75    C     Define SEAICE_AGE_VOL to associate age with volume.
76    #undef SEAICE_AGE
77    #ifdef SEAICE_AGE
78    # undef SEAICE_AGE_VOL
79    #endif
80    
81    C--   By default the seaice model is discretized on a B-Grid (for
82  C     historical reasons). Define the following flag to use a new  C     historical reasons). Define the following flag to use a new
83  C     (not thoroughly) test version on a C-grid  C     (not thoroughly) test version on a C-grid
84  #define SEAICE_CGRID  #define SEAICE_CGRID
85    
86  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  
87  #ifdef SEAICE_CGRID  #ifdef SEAICE_CGRID
88  #define SEAICE_ALLOW_EVP  C     enable EVP code by defining the following flag
89    # define SEAICE_ALLOW_EVP
90    # ifdef SEAICE_ALLOW_EVP
91    C--   When set use SEAICE_zetaMin and SEAICE_evpDampC to limit
92    C--   viscosities from below and above in seaice_evp
93    C--   not necessary, and not recommended
94    #  undef SEAICE_ALLOW_CLIPZETA
95    # endif /* SEAICE_ALLOW_EVP */
96    C     allow the truncated ellipse rheology (runtime flag SEAICEuseTEM)
97    # undef SEAICE_ALLOW_TEM
98    #else /* not SEAICE_CGRID, but old B-grid */
99    C--   By default for B-grid dynamics solver wind stress under sea-ice is
100    C     set to the same value as it would be if there was no sea-ice.
101    C     Define following CPP flag for B-grid ice-ocean stress coupling.
102    # define SEAICE_BICE_STRESS
103    
104    C--   By default for B-grid dynamics solver surface tilt is obtained
105    C     indirectly via geostrophic velocities. Define following CPP
106    C     in order to use ETAN instead.
107    # define EXPLICIT_SSH_SLOPE
108  #endif /* SEAICE_CGRID */  #endif /* SEAICE_CGRID */
109    
110    C--   When set use MAX_HEFF to cap sea ice thickness in seaice_growth
111    #undef SEAICE_CAP_HEFF
112    C--   When set limit the Ice-Loading to mass of 1/5 of Surface ocean grid-box
113    #undef SEAICE_CAP_ICELOAD
114    C--   When set use SEAICE_clipVelocties = .true., to clip U/VICE at 40cm/s,
115    C--   not recommended
116    #undef SEAICE_ALLOW_CLIPVELS
117    
118    C     enable free drift code
119    #undef SEAICE_ALLOW_FREEDRIFT
120    
121  #endif /* SEAICE_OPTIONS_H */  #endif /* SEAICE_OPTIONS_H */
122    
123  CEH3 ;;; Local Variables: ***  CEH3 ;;; Local Variables: ***
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