This computation involved: Met Office Extended Operational NWP model deployed on Met Office supercomputer (Exeter). The version of the Unified Model (UM) model currently being used for stratospheric data assimilation is the 50-level troposphere-stratosphere configuration. This model includes a scheme to represent forcing from a full spectrum of gravity wave phase speeds, and a simple representation of methane oxidation has been included to improve the simulation of water vapour.
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