Articles | Volume 19, issue 4
https://doi.org/10.5194/gmd-19-1473-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/gmd-19-1473-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Model description paper
| 
20 Feb 2026
Model description paper |
| 20 Feb 2026
| 20 Feb 2026
The Met Office Unified Model Global Atmosphere 8.0 and JULES Global Land 9.0 configurations
Martin Willett
CORRESPONDING AUTHOR
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Melissa Brooks
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Andrew Bushell
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Paul Earnshaw
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Samantha Smith
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Lorenzo Tomassini
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Martin Best
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Ian Boutle
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Jennifer Brooke
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
John M. Edwards
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Andrew D. Elvidge
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom
Kalli Furtado
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
now at: National Oceanography Center, European Way, Southampton, SO14 3ZH, United Kingdom
Catherine Hardacre
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
now at: School of Physical and Chemical Sciences, University of Canterbury, Canterbury, New Zealand
Andrew J. Hartley
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Alan J. Hewitt
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Ben Johnson
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Adrian Lock
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Andy Malcolm
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Jane Mulcahy
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Eike Müller
Department of Mathematical Sciences, University of Bath, Bath, BA2 7AY, United Kingdom
Ian A. Renfrew
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom
Heather Rumbold
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Gabriel G. Rooney
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Alistair Sellar
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Masashi Ujiie
Japanese Meteorological Agency, Tokyo, Japan
Annelize van Niekerk
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
now at: ECMWF, Shinfield Park, Reading, RG2 9AX, United Kingdom
Andy Wiltshire
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
Michael Whitall
Met Office, FitzRoy Road, Exeter, Devon, EX1 3PB, United Kingdom
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Latest update: 20 Feb 2026
Short summary
Global Atmosphere (GA) configurations of the Unified Model (UM) and Global Land (GL) configurations of Joint UK Land Environment Simulator (JULES) are developed for use in any global atmospheric modelling application. We describe a recent iteration of these configurations, GA8GL9, which includes improvements to the representation of convection and other physical processes. GA8GL9 is used for operational weather prediction in the UK and forms the basis for the next GA and GL configuration.
Global Atmosphere (GA) configurations of the Unified Model (UM) and Global Land (GL)...
