The AMSU data were kindly provided by Anke Thoss, who is with the Swedish Meteorological and Hydrological Institute (SMHI). The author would also like to thank Nigel Atkinson and Tim Hewison, both with the U.K. Met. Office, for many constructive comments on this paper. I would further like to thank Barbara Burns from Aerojet for her thorough and constructive review.
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