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About ClimGen : ClimGen references : ClimGen software : ClimGen data

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 developed by Tim Osborn (Climatic Research Unit) and Tim Mitchell (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 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 UEA -- notably SCENGEN. Information about SCENGEN version 2.x (Wigley et al., 2000; Hulme et al., 2000) is available here. SCENGEN has since been developed further by Tom Wigley at NCAR, Boulder, Colorado, USA, and information about SCENGEN version 4.x (Wigley, 2003) and is available here. 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


ClimGen software

ClimGen is written in Fortran95 and the source code is available for use in selected projects. Please contact Tim Osborn if you wish to obtain this software.

ClimGen version history

  • Version 1-00 written by Tim Mitchell and Tim Osborn in 2004.
    • This version is/was used in:
      • Arnell and Osborn (2006)
      • Tyndall Centre's Community Integrated Assessment System (CIAS) from 2004-2008.
        • Warren et al. (2008)
  • Version 1-02 written by Tim Osborn in 2008.
    • This version is/was used in:
      • NERC QUEST-GSI (Global-Scale Impacts) project, 2007-2011.
      • DECC/Defra AVOID project, 2010-2013.
      • EU ERMITAGE project, 2010-2013.
      • Tyndall Centre's Community Integrated Assessment System (CIAS) from 2009-2012.
  • Versions 1-10, 1-11, 1-20 and 1-21 written by Tim Osborn, with contributions from Craig Wallace, in 2012.
    • This version is/was used in:
      • EU ERMITAGE project, 2010-2013.
      • Tyndall Centre's Community Integrated Assessment System (CIAS) from 2012-2013.
  • Version 1-22 written by Tim Osborn, with contributions from Craig Wallace and Tom Melvin, in 2013.
    • This version is/was used in:
      • EU ToPDAd project, 2012-2015.

ClimGen data

ClimGen is being used in the EU ToPDAd project.

ClimGen is being used in the NERC QUEST-GSI (Global-Scale Impacts) project.

ClimGen is being used in the EU ERMITAGE project.

Page last rebuilt: 3 Apr 2014