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. The Met Office Unified Model (UM) is a state-of-the-artweather and climate model that is used operationally worldwide. UKCA is thechemistry and aerosol sub model of the UM that enables interactivecomposition and physical atmosphere interactions, but which adds anadditional 120 000 lines of code to the model. Ensuring that the UM code andUM-UKCA (the UM running with interactive chemistry and aerosols) is welltested is thus essential. While a comprehensive test harness is inplace at the Met Office and partner sites to aid in development, this is notavailable to many UM users. Recently, the Met Office have made available avirtual machine environment that can be used to run the UM on a desktop orlaptop PC. Here we describe the development of a UM-UKCA configuration thatis able to run within this virtual machine while only needing 6 GB of memory,before discussing the applications of this system for model development,testing, and training.

geoscientific model development

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