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Volume 11, issue 9 | Copyright
Geosci. Model Dev., 11, 3647-3657, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Development and technical paper 06 Sep 2018

Development and technical paper | 06 Sep 2018

Using a virtual machine environment for developing, testing, and training for the UM-UKCA composition-climate model, using Unified Model version 10.9 and above

Nathan Luke Abraham1,2, Alexander T. Archibald1,2, Paul Cresswell3, Sam Cusworth3, Mohit Dalvi3, David Matthews3, Steven Wardle3, and Stuart Whitehouse3 Nathan Luke Abraham et al.
  • 1Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
  • 2National Centre for Atmospheric Science, UK
  • 3 Met Office, FitzRoy Road, Exeter, EX1 3PB, UK

Abstract. The Met Office Unified Model (UM) is a state-of-the-art weather and climate model that is used operationally worldwide. UKCA is the chemistry and aerosol sub model of the UM that enables interactive composition and physical atmosphere interactions, but which adds an additional 120000 lines of code to the model. Ensuring that the UM code and UM-UKCA (the UM running with interactive chemistry and aerosols) is well tested is thus essential. While a comprehensive test harness is in place at the Met Office and partner sites to aid in development, this is not available to many UM users. Recently, the Met Office have made available a virtual machine environment that can be used to run the UM on a desktop or laptop PC. Here we describe the development of a UM-UKCA configuration that is able to run within this virtual machine while only needing 6GB of memory, before discussing the applications of this system for model development, testing, and training.

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Short summary
Using a virtual machine environment, a low-resolution configuration of the United Kingdom Chemistry and Aerosols (UKCA) composition-climate model has been developed. This configuration, while not suitable for long simulations, is an excellent test-bed for new model developments and can be used to train new users in how to use UKCA. This work was motivated by the desire to improve the usability of UKCA, and to encourage more users to become involved with the code development process.
Using a virtual machine environment, a low-resolution configuration of the United Kingdom...