Intermediate General Circulation Model: Difference between revisions

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{{Refimprove|date = August 2015}}The Reading '''Reading Intermediate General Circulation Model''' ('''IGCM'''), is a simplified or "intermediate" [[Globalglobal climate model]], which is developed by members of the [http://www.reading.ac.uk/meterology Department of Meteorology]{{Dead link|date=January 2020 |bot=InternetArchiveBot |fix-attempted=yes }} at the [[University of Reading]], and by members of the [http://www.meteo.mcgill.ca/bourqui/ Stratospheric Dynamics and Chemistry Group] of the [[McGill Atmospheric and Oceanic Sciences|Department of Atmospheric and Oceanic Sciences]] at [[McGill University]].

The IGCM is a fast [[Global climate model|GCM]] based on the primitive-equations [[Baroclinity|baroclinic]] model of Hoskins and Simmons, which has been converted to run on workstations. Several versionsvariations have been developed withby adjusting representations of the physics.

* IGCM1: Portable version of the original spectral, dry baroclinic model formulated in sigma-levels, with an option for [[Nudgingdata 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, a uniform vertical diffusion, and can [[Advection|advect]] tracers.

* IGCM3x: Intermediate climate model whichthat includes more sophisticated moist 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 process|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.

== See also ==

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[[Category:Numerical climate and weather models]]

[[Category:Environment and Climate Change Canada]]

{{climatology-stub}}