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The Met Office Unified Model Global Atmosphere 3.0/3.1 and JULES Global Land 3.0/3.1 configurations

2011; Copernicus Publications; Volume: 4; Issue: 4 Linguagem: Inglês

10.5194/gmd-4-919-2011

1991-9603

David Walters, Martin Best, Andrew C. Bushell, Dan Copsey, John Edwards, Pete Falloon, Chris Harris, Adrian Lock, James Manners, Cyril Morcrette, Malcolm Roberts, R. A. Stratton, Stuart Webster, Jonathan Wilkinson, M. R. Willett, Ian Boutle, Paul Earnshaw, Peter Hill, Craig MacLachlan, Gill Martin, Wilfran Moufouma‐Okia, Matthew D. Palmer, J. C. Petch, G. G. Rooney, Adam A. Scaife, K. D. Williams,

Atmospheric and Environmental Gas Dynamics

Abstract. We describe Global Atmosphere 3.0 (GA3.0): a configuration of the Met Office Unified Model (MetUM) developed for use across climate research and weather prediction activities. GA3.0 has been formulated by converging the development paths of the Met Office's weather and climate global atmospheric model components such that wherever possible, atmospheric processes are modelled or parametrized seamlessly across spatial resolutions and timescales. This unified development process will provide the Met Office and its collaborators with regular releases of a configuration that has been evaluated, and can hence be applied, over a variety of modelling régimes. We also describe Global Land 3.0 (GL3.0): a configuration of the JULES community land surface model developed for use with GA3.0. This paper provides a comprehensive technical and scientific description of the GA3.0 and GL3.0 (and related GA3.1 and GL3.1) configurations and presents the results of some initial evaluations of their performance in various applications. It is to be the first in a series of papers describing each subsequent Global Atmosphere release; this will provide a single source of reference for established users and developers as well as researchers requiring access to a current, but trusted, global MetUM setup.