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About ClimGen : ClimGen references : ClimGen software : ClimGen data : Papers that used ClimGen

About ClimGen

ClimGen is a spatial climate scenario generator, designed to allow users to explore some of the uncertainties in future climate change at regional scales.

ClimGen was originally developed by Tim Osborn (Climatic Research Unit, CRU) and Tim Mitchell (then at the Tyndall Centre for Climate Change Research), both in the School of Environmental Science, University of East Anglia, Norwich, UK. ClimGen is being maintained and developed further by Tim Osborn. Other contributions (data processing, advice, testing, etc.) have been made by Craig Wallace, Ian Harris, Tom Melvin, Nigel Arnell, Rachel Warren, Rita Yu, Jeff Price and a number of others.

ClimGen is based on the so-called "pattern-scaling" approach to generating spatial climate change information for a given global-mean temperature change. The pattern-scaling approach relies on the assumption that the pattern of climate change (encompassing the geographical, seasonal and multi-variable structure) simulated by coupled atmosphere-ocean general circulation models (AOGCMs) is relatively constant (for a given AOGCM) under a range of rates and amounts of global warming, provided that the changes are expressed as change per unit Kelvin of global-mean temperature change. These normalised patterns of climate change do, however, show considerable variation between different AOGCMs, and it is this variation that ClimGen is principally designed to explore. Further scientific details are provided in the technical paper given below.

ClimGen also provides a convenient interface for generating these scenarios and for extracting observed climate data in a common format, with options to extract user-defined regions, seasons and specific time periods.

In some respects, ClimGen is similar to other spatial scenario generators that use the pattern-scaling approach, some of which are listed in the technical paper given below. Similar tools have previously been developed at CRU/UEA -- notably SCENGEN. Information about SCENGEN version 2.x (Wigley et al., 2000; Hulme et al., 2000) is available here (archived copy). SCENGEN was subsequently developed further by Tom Wigley at NCAR, Boulder, Colorado, USA, and information about SCENGEN version 4.x (Wigley, 2003) was available here (archived copy). ClimGen does not re-use any of the SCENGEN software code, and only uses the concepts from SCENGEN that are common to all tools of this type.

ClimGen references

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