Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
doi:10.5194/gmd-2016-194
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Model description paper
12 Aug 2016
Review status
A revision of this discussion paper was accepted for the journal Geoscientific Model Development (GMD) and is expected to appear here in due course.
The Met Office Unified Model Global Atmosphere 6.0/6.1 and JULES Global Land 6.0/6.1 configurations
David Walters1, Malcolm Brooks1, Ian Boutle1, Thomas Melvin1, Rachel Stratton1, Simon Vosper1, Helen Wells1, Keith Williams1, Nigel Wood1, Thomas Allen1, Andrew Bushell1, Dan Copsey1, Paul Earnshaw1, John Edwards1, Markus Gross1,2, Steven Hardiman1, Chris Harris1, Julian Heming1, Nicholas Klingaman3, Richard Levine1, James Manners1, Gill Martin1, Sean Milton1, Marion Mittermaier1, Cyril Morcrette1, Thomas Riddick1,4, Malcolm Roberts1, Claudio Sanchez1, Paul Selwood1, Alison Stirling1, Chris Smith1, Dan Suri1, Warren Tennant1, Pier Luigi Vidale1, Jonathan Wilkinson1, Martin Willett1, Steve Woolnough3, and Prince Xavier1 1Met Office, FitzRoy Road, Exeter, EX1 3PB, UK
2Centro de Investigación Científica y de Educación Superior de Ensenada, Departamento de Oceanografía Física, Carretera Ensenada-Tijuana 3918, Ensenada BC 22860, Mexico
3National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
4Max Planck Institute for Meteorology, Bundesstrasse 53, 20146 Hamburg, Germany
Abstract. We describe Global Atmosphere 6.0 and Global Land 6.0: the latest science configurations of the Met Office Unified Model and JULES land surface model developed for use across all timescales. Global Atmosphere 6.0 includes the ENDGame dynamical core, which significantly increases mid-latitude variability improving a known model bias. Alongside developments of the model’s physical parametrisations, ENDGame also increases variability in the tropics, which leads to an improved representation of tropical cyclones and other tropical phenomena. Further developments of the atmospheric and land surface parametrisations improve other aspects of model performance, including the forecasting of surface weather phenomena.

We also describe Global Atmosphere 6.1 and Global Land 6.1, which include a small number of long-standing differences from our main trunk configurations that we continue to require for operational global weather prediction.

Since July 2014, GA6.1/GL6.1 has been used by the Met Office for operational global NWP, whilst GA6.0/GL6.0 was implemented in its remaining global prediction systems over the following year.


Citation: Walters, D., Brooks, M., Boutle, I., Melvin, T., Stratton, R., Vosper, S., Wells, H., Williams, K., Wood, N., Allen, T., Bushell, A., Copsey, D., Earnshaw, P., Edwards, J., Gross, M., Hardiman, S., Harris, C., Heming, J., Klingaman, N., Levine, R., Manners, J., Martin, G., Milton, S., Mittermaier, M., Morcrette, C., Riddick, T., Roberts, M., Sanchez, C., Selwood, P., Stirling, A., Smith, C., Suri, D., Tennant, W., Vidale, P. L., Wilkinson, J., Willett, M., Woolnough, S., and Xavier, P.: The Met Office Unified Model Global Atmosphere 6.0/6.1 and JULES Global Land 6.0/6.1 configurations, Geosci. Model Dev. Discuss., doi:10.5194/gmd-2016-194, in review, 2016.
David Walters et al.
David Walters et al.

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Short summary
Global Atmosphere (GA) configurations of the Unified Model and Global Land (GL) configurations of JULES are developed for use in any global atmospheric modelling application.

We describe a recent iteration of these configurations: GA6/GL6. This includes ENDGame: a new dynamical core designed to improve the model's accuracy, stability and scalability. GA6 is now operational in a variety of Met Office and UM collaborators applications and hence its documentation is important.
Global Atmosphere (GA) configurations of the Unified Model and Global Land (GL) configurations...
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