C $Header: /u/gcmpack/MITgcm/verification/global_ocean.cs32x15/code/SEAICE_OPTIONS.h,v 1.3 2009/11/24 19:07:00 jmc Exp $
C $Name:  $

C     /==========================================================\
C     | SEAICE_OPTIONS.h                                         |
C     | o CPP options file for sea ice package.                  |
C     |==========================================================|
C     | Use this file for selecting options within the sea ice   |
C     | package.                                                 |
C     \==========================================================/

#ifndef SEAICE_OPTIONS_H
#define SEAICE_OPTIONS_H
#include "PACKAGES_CONFIG.h"
#include "CPP_OPTIONS.h"

C--   Write "text-plots" of certain fields in STDOUT for debugging.
#undef SEAICE_DEBUG

C--   Allow sea-ice dynamic code.
C     This option is provided to allow use of TAMC
C     on the thermodynamics component of the code only.
C     Sea-ice dynamics can also be turned off at runtime
C     using variable SEAICEuseDYNAMICS.
#define SEAICE_ALLOW_DYNAMICS

C--   By default, the sea-ice package uses its own integrated bulk
C     formulae to compute fluxes (fu, fv, EmPmR, Qnet, and Qsw) over
C     open-ocean.  When this flag is set, these variables are computed
C     in a separate external package, for example, pkg/exf, and then
C     modified for sea-ice effects by pkg/seaice.
#define SEAICE_EXTERNAL_FLUXES

C--   By default, the sea-ice package uses 2-category thermodynamics.
C     When this flag is set, an 8-category calculation of ice
C     thermodynamics is carried out in groatb.F
C     Note the pickup_seaice.* generated by this option differ
C     from those generated with the default 2-category model.
C     Therefore it is not possible to switch between the two
C     in the middle of an integration.
#undef SEAICE_MULTICATEGORY

C--   By default the freezing point of water is set to the value of 
C     the parameter SEAICE_freeze (=-1.96 by default). To use a
C     simple linear dependence of the freezing point on salinity, 
C     set the following flag (pressure is assumed to have no effect,
C     which is a good assumption for the top 20 meters). With this
C     option defined the parameter SEAICE_freeze has no effect.
#undef SEAICE_VARIABLE_FREEZING_POINT

C--   Allow SEAICEuseFlooding, which converts snow to ice if submerged.
#define ALLOW_SEAICE_FLOODING

C--   By default sea ice is fresh.  Set following flag for salty ice.
#undef SEAICE_SALINITY

C--   Track sea ice age.
#undef SEAICE_AGE

C--   By default the seaice model is discretized on a B-Grid (for 
C     historical reasons). Define the following flag to use a new
C     (not thoroughly) test version on a C-grid
#define SEAICE_CGRID

C--   Only for the C-grid version it is possible to 
#ifdef SEAICE_CGRID
C     enable EVP code by defining the following flag
#define SEAICE_ALLOW_EVP
#ifdef SEAICE_ALLOW_EVP
C--   When set use SEAICE_zetaMin and SEAICE_evpDampC to limit
C--   viscosities from below and above in seaice_evp
C--   not necessary, and not recommended
#undef SEAICE_ALLOW_CLIPZETA
#endif /* SEAICE_ALLOW_EVP */
C     allow the truncated ellipse rheology (runtime flag SEAICEuseTEM)
#undef SEAICE_ALLOW_TEM
#else /* not SEAICE_CGRID, but old B-grid */
C--   By default for B-grid dynamics solver wind stress under sea-ice is
C     set to the same value as it would be if there was no sea-ice.
C     Define following CPP flag for B-grid ice-ocean stress coupling.
#define SEAICE_BICE_STRESS

C--   By default for B-grid dynamics solver surface tilt is obtained
C     indirectly via geostrophic velocities. Define following CPP
C     in order to use ETAN instead.
#define EXPLICIT_SSH_SLOPE

#endif /* SEAICE_CGRID */

C--   When set use MAX_HEFF to cap sea ice thickness in seaice_growth
#undef SEAICE_CAP_HEFF
C--   When set use SEAICE_clipVelocties = .true., to clip U/VICE at 40cm/s,
#define SEAICE_ALLOW_CLIPVELS

#endif /* SEAICE_OPTIONS_H */

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