The Met Office Unified Model Global Atmosphere 6.0/6.1 and JULES Global Land 6.0/6.1 configurations

Walters, David; Boutle, Ian; Brooks, Malcolm; Melvin, Thomas; Stratton, Rachel; Vosper, Simon; Wells, Helen; Williams, Keith; Wood, Nigel; Allen, Thomas; Bushell, Andrew; Copsey, Dan; Earnshaw, Paul; Edwards, John; Gross, Markus; Hardiman, Steven; Harris, Chris; Heming, Julian; Klingaman, Nicholas; Levine, Richard; Manners, James; Martin, Gill; Milton, Sean; Mittermaier, Marion; Morcrette, Cyril; Riddick, Thomas; Roberts, Malcolm; Sanchez, Claudio; Selwood, Paul; Stirling, Alison; Smith, Chris; Suri, Dan; Tennant, Warren; Vidale, Pier Luigi; Wilkinson, Jonathan; Willett, Martin; Woolnough, Steve; Xavier, Prince

doi:https://doi.org/10.5194/gmd-10-1487-2017

Articles | Volume 10, issue 4

Geosci. Model Dev., 10, 1487–1520, 2017

https://doi.org/10.5194/gmd-10-1487-2017

© Author(s) 2017. 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., 10, 1487–1520, 2017

https://doi.org/10.5194/gmd-10-1487-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 10, issue 4

Model description paper 11 Apr 2017

Model description paper | 11 Apr 2017

The Met Office Unified Model Global Atmosphere 6.0/6.1 and JULES Global Land 6.0/6.1 configurations

David Walters¹, Ian Boutle¹, Malcolm Brooks¹, Thomas Melvin¹, Rachel Stratton¹, Simon Vosper¹, Helen Wells¹, Keith Williams¹, Nigel Wood¹, Thomas Allen¹, Andrew Bushell¹, Dan Copsey¹, Paul Earnshaw¹, John Edwards¹, Markus Gross^1,2, Steven Hardiman¹, Chris Harris¹, Julian Heming¹, Nicholas Klingaman³, Richard Levine¹, James Manners¹, Gill Martin¹, Sean Milton¹, Marion Mittermaier¹, Cyril Morcrette¹, Thomas Riddick^1,4, 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 David Walters et al.

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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

Received: 19 Jul 2016 – Discussion started: 12 Aug 2016 – Revised: 27 Jan 2017 – Accepted: 10 Feb 2017 – Published: 11 Apr 2017

Abstract. We describe Global Atmosphere 6.0 and Global Land 6.0 (GA6.0/GL6.0): the latest science configurations of the Met Office Unified Model and JULES (Joint UK Land Environment Simulator) land surface model developed for use across all timescales. Global Atmosphere 6.0 includes the ENDGame (Even Newer Dynamics for General atmospheric modelling of the environment) 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 GA6.1/GL6.1, which includes 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 numerical weather prediction, whilst GA6.0/GL6.0 was implemented in its remaining global prediction systems over the following year.

How to cite. Walters, D., Boutle, I., Brooks, M., 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., 10, 1487–1520, https://doi.org/10.5194/gmd-10-1487-2017, 2017.