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Discussion papers | Copyright
https://doi.org/10.5194/gmd-2017-291
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 28 Nov 2017

Model description paper | 28 Nov 2017

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The Met Office Unified Model Global Atmosphere 7.0/7.1 and JULES Global Land 7.0 configurations

David Walters1, Anthony Baran1, Ian Boutle1, Malcolm Brooks1, Paul Earnshaw1, John Edwards1, Kalli Furtado1, Peter Hill2, Adrian Lock1, James Manners1, Cyril Morcrette1, Jane Mulcahy1, Claudio Sanchez1, Chris Smith1, Rachel Stratton1, Warren Tennant1, Lorenzo Tomassini1, Kwinten Van Weverberg1, Simon Vosper1, Martin Willett1, Jo Browse3, Andrew Bushell1, Mohit Dalvi1, Richard Essery4, Nicola Gedney5, Steven Hardiman1, Ben Johnson1, Colin Johnson1, Andy Jones1, Graham Mann6,7, Sean Milton1, Heather Rumbold1, Alistair Sellar1, Masashi Ujiie8, Michael Whitall1, Keith Williams1, and Mohamed Zerroukat1 David Walters et al.
  • 1Met Office, FitzRoy Road, Exeter, EX1 3PB, UK
  • 2Department of Meteorology, University of Reading, Reading, RG6 6BB, UK
  • 3Centre for Geography, Society and the Environment, University of Exeter, Penryn Campus, Cornwall, TR10 9EZ, UK
  • 4School of Geosciences, University of Edinburgh, Edinburgh, EH8 9XP, UK
  • 5Met Office, Joint Centre for Hydrometeorological Research, Maclean Building, Wallingford, OX10 8BB, UK
  • 6School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK
  • 7National Centre for Atmospheric Science, University of Leeds, Leeds, LS2 9JT, UK
  • 8Numerical Prediction Division, Japan Meteorological Agency 1-3-4 Otemachi Chiyoda-ku Tokyo 100-8122, Japan

Abstract. We describe Global Atmosphere 7.0 and Global Land 7.0 (GA7.0/GL7.0): the latest science configurations of the Met Office Unified Model and JULES land surface model developed for use across weather and climate timescales. GA7.0 and GL7.0 include incremental developments and targeted improvements that between them address four critical errors identified in previous configurations: excessive precipitation biases over India, warm/moist biases in the tropical tropopause layer, a source of energy non-conservation in the advection scheme and excessive surface radiation biases over the Southern Ocean. They also include two new parametrisations, namely the UKCA Glomap-mode aerosol scheme and the JULES multi-layer snow scheme, which improve the fidelity of the simulation and were required for the coupled climate models and Earth system models that will use these configurations in submissions to CMIP6.

In addition, we describe the GA7.1 branch configuration, which reduces an overly negative anthropogenic aerosol effective radiative forcing in GA7.0, whilst maintaining the quality of simulations of the present-day climate. GA7.1/GL7.0 will form the physical atmosphere/land component in the HadGEM3-GC3.1 and UKESM1 climate models.

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Global Atmosphere (GA) configurations of the Unified Model (UM) 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: GA7/GL7, which includes new aerosol and snow schemes and addresses the four critical errors identified in GA6. GA7/GL7 will underpin the UK's contributions to CMIP6 and hence their documentation is important.
Global Atmosphere (GA) configurations of the Unified Model (UM) and Global Land (GL)...
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