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C $Header: /u/gcmpack/MITgcm/pkg/seaice/SEAICE_OPTIONS.h,v 1.22 2007/05/14 14:39:21 jmc Exp $ |
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C $Name: $ |
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|
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C /==========================================================\ |
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C | SEAICE_OPTIONS.h | |
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C | o CPP options file for sea ice package. | |
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C |==========================================================| |
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C | Use this file for selecting options within the sea ice | |
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C | package. | |
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C \==========================================================/ |
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|
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#ifndef SEAICE_OPTIONS_H |
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#define SEAICE_OPTIONS_H |
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_OPTIONS.h" |
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|
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C-- Write "text-plots" of certain fields in STDOUT for debugging. |
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#undef SEAICE_DEBUG |
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|
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C-- Allow sea-ice dynamic code. |
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C This option is provided to allow use of TAMC |
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C on the thermodynamics component of the code only. |
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C Sea-ice dynamics can also be turned off at runtime |
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C using variable SEAICEuseDYNAMICS. |
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#define SEAICE_ALLOW_DYNAMICS |
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|
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C-- By default, pkg/seaice defines forcing variable internally, in |
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C SEAICE_FFIELDS.h, and reads them in from files. When CPP option |
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C SEAICE_EXTERNAL_FORCING is defined, the above forcing variables |
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C are defined and provided by an external package. At present this |
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C option is hardwired for pkg/exf and the variables are passed using |
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C include file EXF_FIELDS.h (=> cannot be defined without pkg/EXF ) |
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#define SEAICE_EXTERNAL_FORCING |
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#ifndef ALLOW_EXF |
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# undef SEAICE_EXTERNAL_FORCING |
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#endif |
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|
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#ifdef SEAICE_EXTERNAL_FORCING |
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# include "EXF_OPTIONS.h" |
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C-- By default, the sea-ice package uses its own integrated bulk |
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C formulae to compute fluxes (fu, fv, EmPmR, Qnet, and Qsw) over |
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C open-ocean. When this flag is set, these variables are computed |
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C in a separate external package, for example, pkg/exf, and then |
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C modified for sea-ice effects by pkg/seaice. |
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# define SEAICE_EXTERNAL_FLUXES |
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|
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#else /* SEAICE_EXTERNAL_FORCING */ |
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C- current implementation requires those options to be set: |
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# undef SEAICE_EXTERNAL_FLUXES |
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# define ALLOW_ATM_TEMP |
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# define ALLOW_DOWNWARD_RADIATION |
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# define ALLOW_RUNOFF |
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|
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#endif /* SEAICE_EXTERNAL_FORCING */ |
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|
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|
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C-- By default, the sea-ice package uses 2-category thermodynamics. |
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C When this flag is set, an 8-category calculation of ice |
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C thermodynamics is carried out in groatb.F |
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C Note the pickup_seaice.* generated by this option differ |
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C from those generated with the default 2-category model. |
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C Therefore it is not possible to switch between the two |
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C in the middle of an integration. |
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#undef SEAICE_MULTICATEGORY |
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|
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C-- By default cdm wind stress under sea-ice is set to the |
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C same value as it would be if there was no sea-ice. |
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C This is a placeholder until a more physically-sensible |
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C stable solution is developed. Apparently ocean stress |
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C that is based on sea-ice velocity can cause trouble in |
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C Arctic Ocean configurations. This temporary solution |
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C also corresponds to that adopted by CCSM-2. For the |
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C adventurous user who requires ice-modified stress, |
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C following options are available. |
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#undef SEAICE_ORIGINAL_BAD_ICE_STRESS |
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#undef SEAICE_TEST_ICE_STRESS_1 |
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|
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C-- By default the freezing point of water is set to the value of |
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C the parameter SEAICE_freeze (=-1.96 by default). To use a |
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C simple linear dependence of the freezing point on salinity, |
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C set the following flag (pressure is assumed to have no effect, |
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C which is a good assumption for the top 20 meters). With this |
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C option defined the parameter SEAICE_freeze has no effect. |
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#undef SEAICE_VARIABLE_FREEZING_POINT |
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|
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C-- Allow SEAICEuseFlooding, which converts snow to ice if submerged. |
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#undef ALLOW_SEAICE_FLOODING |
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|
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C-- By default the seaice model is discretized on a B-Grid (for |
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C historical reasons). Define the following flag to use a new |
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C (not thoroughly) test version on a C-grid |
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#define SEAICE_CGRID |
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|
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C-- Only for the C-grid version it is possible to enable EVP code by |
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C defining the following flag |
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#ifdef SEAICE_CGRID |
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#define SEAICE_ALLOW_EVP |
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#endif /* SEAICE_CGRID */ |
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|
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#endif /* SEAICE_OPTIONS_H */ |
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|
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CEH3 ;;; Local Variables: *** |
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CEH3 ;;; mode:fortran *** |
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CEH3 ;;; End: *** |
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