GENIE:Goldstein

Summary

 * Name of model: GOLDSTEIN (Global Ocean Linear Drag Salt and Temperature Equation INtegrator)


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


 * Reference and description: Edwards and Marsh (2005)


 * Original version: Edwards and Shepherd (2001) ??


 * Units: non-dimensional


 * Sign convention: positive into ocean (fluxes of heat & moisture)


 * Grid: Preferrred meshes at present are 36x36s (constant increments of sin of latitude) and 64x32 (5.625 degree resolution)


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


 * Checks to ensure continuity: total heat, freshwater in ocean ??


 * Dynamical variables: Potential temperature and Salinity anomaly (relative to 34.9 psu)

Processes modelled

 * Horizontal and vertical transport of heat and freshwater in ocean
 * Surface exchange of heat with atmosphere and sea ice, according to balance of incoming shortwave radiation, sensible and latent heat fluxes, and outgoing long-wave radiation, as a function of planetary albedo and radiative gases (CO2, water vapour)
 * Surface exchange of moisture with atmosphere, sea ice and land, according to balance of precipitation, evaporation and runoff (at coastal gridpoints)

Key parameters commonly used for tuning / model configuration

 * Horizontal (isopycnal) tracer diffusivity (isopyc. diff.)
 * Vertical (diapycnal) tracer diffusivity (diapyc. diff.)
 * Drag coefficient (adrag)
 * Wind sacling (scl)

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
 * isopyc. diff.
 * m2s-1
 * diapyc. diff.
 * m2s-1
 * adrag
 * day-1
 * scl
 * unitless
 * }
 * adrag
 * day-1
 * scl
 * unitless
 * }
 * unitless
 * }
 * }
 * }

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

eb_go_gs and cgoldstein
On the 14/12/06 Gethin had the following final values for average SAT:

On the 12/02/07 Gethin had the following final values for average SAT, after doubling the run length: