Intermediate General Circulation Model

The Reading Intermediate General Circulation Model (IGCM), is a simplified or "intermediate" Global climate model, which is developed by members of the Department of Meteorology at the University of Reading, and by members of the Stratospheric Dynamics and Chemistry Group of the Department of Atmospheric and Oceanic Sciences at McGill University.

The IGCM is based on the primitive-equations baroclinic model of Hoskins and Simmons, which has been converted to run on workstations. Several variations have been developed by adjusting representations of the physics.

IGCM1: Portable version of the original spectral, dry baroclinic model formulated in sigma-levels, with an option for Newtonian relaxation and Rayleigh friction, with no surface.
IGCM2: Includes simplified moist parameterisations, a cheap "radiation scheme" (i.e. constant tropospheric cooling), a bulk formulation scheme for the boundary layer, fixed surface temperatures and humidity, uniform vertical diffusion, and can advect tracers.
IGCM3x: Intermediate climate model that includes more sophisticated moisture/clouds parameterisations, a radiation scheme with various gas absorbers and a more realistic surface with an orography and land and sea surface schemes.

The adiabatic version, IGCM1, is freely available. Access to IGCM2 and IGCM3 is restricted to members of the Department of Meteorology at the University of Reading and collaborating researchers.

External links

IGCM web page

Atmospheric, oceanographic and climate models

Model types

Atmospheric model Climate model Numerical weather prediction Tropical cyclone forecast model Atmospheric dispersion modeling Chemical transport model Upper-atmospheric models Ensemble forecasting Model output statistics Meteorological reanalysis Parametrization

Specific models

Climate	IGCM HadCM3 HadGEM1 GFDL CM2.X CGCM CCSM CFSv2 ECHAM MPAS

Global weather	IFS (ECMWF) FIM GEM GFS NAVGEM UM JMA GME ARPEGE

Regional and mesoscale atmospheric	NAM RR / RAP RAMS WRF RAQMS HIRLAM LAPS RPM

Regional and mesoscale oceanographic	HyCOM ROMS POM MOM FVCOM MITgcm

Atmospheric dispersion	ADMS AERMOD ATSTEP AUSTAL2000 CALPUFF DISPERSION21 ISC3 MEMO MERCURE NAME OSPM PUFF-PLUME RIMPUFF SAFE AIR

Chemical transport	CLaMS MOZART GEOS-Chem

Land surface parametrization	JULES CLASS ISBA

Discontinued	AVN / MRF / GSM Eta LFM MM5 NGM NOGAPS RUC

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Intermediate General Circulation Model

See also

External links