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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 1
Geosci. Model Dev., 7, 361-386, 2014
https://doi.org/10.5194/gmd-7-361-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: GA/GL: Decription of the Met Office Unified Model Global Atmosphere...

Geosci. Model Dev., 7, 361-386, 2014
https://doi.org/10.5194/gmd-7-361-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 20 Feb 2014

Model description paper | 20 Feb 2014

The Met Office Unified Model Global Atmosphere 4.0 and JULES Global Land 4.0 configurations

D. N. Walters1, K. D. Williams1, I. A. Boutle1, A. C. Bushell1, J. M. Edwards1, P. R. Field1, A. P. Lock1, C. J. Morcrette1, R. A. Stratton1, J. M. Wilkinson1, M. R. Willett1, N. Bellouin1,2, A. Bodas-Salcedo1, M. E. Brooks1, D. Copsey1, P. D. Earnshaw1, S. C. Hardiman1, C. M. Harris1, R. C. Levine1, C. MacLachlan1, J. C. Manners1, G. M. Martin1, S. F. Milton1, M. D. Palmer1, M. J. Roberts1, J. M. Rodríguez1, W. J. Tennant1, and P. L. Vidale3 D. N. Walters et al.
  • 1Met Office, FitzRoy Road, Exeter, EX1 3PB, UK
  • 2Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
  • 3National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, RG6 6BB, UK

Abstract. We describe Global Atmosphere 4.0 (GA4.0) and Global Land 4.0 (GL4.0): configurations of the Met Office Unified Model and JULES (Joint UK Land Environment Simulator) community land surface model developed for use in global and regional climate research and weather prediction activities. GA4.0 and GL4.0 are based on the previous GA3.0 and GL3.0 configurations, with the inclusion of developments made by the Met Office and its collaborators during its annual development cycle.

This paper provides a comprehensive technical and scientific description of GA4.0 and GL4.0 as well as details of how these differ from their predecessors. We also present the results of some initial evaluations of their performance. Overall, performance is comparable with that of GA3.0/GL3.0; the updated configurations include improvements to the science of several parametrisation schemes, however, and will form a baseline for further ongoing development.

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