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The IGCM is based on the primitive-equations [[Baroclinity|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 [[data assimilation|Newtonian relaxation]] and [[Rayleigh dissipation function|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 [[Advection|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.
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