GENIE:Seaice

Summary

 * Name of model: GOLDSTEIN Sea Ice


 * Authors/Constructors: Bob Marsh (NOCS) & Neil Edwards (OU)


 * Reference and description: Edwards and Marsh (2005)


 * Original version: Part of UVic Earth System Model (Weaver et al. 2001)


 * Units: SI & non-dimensional


 * Sign convention: positive into sea ice (fluxes of heat & freshwater)


 * Grid: As ocean (preferrred meshes at present are 36x36s and 64x32)


 * Timestep: 100/year (36x36s); 200/year (64x32)


 * Checks to ensure continuity: n/a ??


 * Dynamical variables: Sea ice concentration, thickness and tempertaure

Processes modelled

 * Horizontal transport of sea ice concentration and thickness
 * Surface exchange of heat with atmosphere, according to balance of incoming shortwave radiation, sensible and latent heat fluxes, and outgoing long-wave radiation
 * Surface exchange of heat with ocean, according to balance of sensible and latent heat fluxes (freezing/melting)
 * Surface exchange of freshwater with atmosphere, according to balance of precipitation and evaporation/sublimation
 * Surface exchange of freshwater with ocean, according to balance of freezing and melting

Key parameters commonly used for tuning / model configuration

 * Sea ice diffusivity (sea ice diff.), of concentration and thickness
 * EVP parameters (optional) - details soon

Tuned values for key parameters
These are ensemble-mean values based on parameter tuning through data assimilation with the Ensemble Kalman Filter (Hargreaves et al. 2004). For further tuned parameter sets see Price et al. (2006)


 * {| border="1" cellpadding="3"

!Parameter !Value !Units
 * T diff. amp.
 * 3.75x106
 * m2s-1
 * }
 * }
 * }

Couplings to other modules

 * Atmosphere-Land (ENTS) – pending further code development
 * Atmosphere-Ocean (GOLDSTEIN)
 * Atmosphere-Sea Ice (N.B. thermodynamics embedded in surface exchange scheme)
 * Atmosphere-Atmospheric Chemistry (ATCHEM)

Atmosphere-Ocean I/O

 * Inputs:
 * Ocean surface temperature (deg. C)


 * Outputs:
 * Air temperature (deg. C)
 * Specific humidity (g/kg)

Atmosphere-Land I/O

 * Inputs:
 * Surface temperature (deg. C)
 * Soil Moisture (m water equivalent)


 * Outputs:
 * Runoff (m s-1 equivalent at coastal gridboxes, according to simple catchment areas) – optional (if not coupled to Land)

Atmosphere-Atmospheric Chemistry I/O

 * Inputs:
 * CO2 (ppt) - optional


 * Outputs:
 * none

Prescribed inputs

 * Wind field (m s-1), annual or monthly-mean NCEP reanalysis interpolated to model grid
 * Climatological Albedo, as function of latitude