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New Aura Microwave Limb Sounder observations of BrO and implications for Bry

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Author(s): L. Millán | N. Livesey | W. Read | L. Froidevaux | D. Kinnison | R. Harwood | I. A. MacKenzie | M. P. Chipperfield

Journal: Atmospheric Measurement Techniques Discussions
ISSN 1867-8610

Volume: 5;
Issue: 1;
Start page: 325;
Date: 2012;
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ABSTRACT
This paper introduces a new inversion algorithm for retrievals of stratospheric BrO from the Aura Microwave Limb Sounder. This version is based on the algorithm described by Livesey et al. (2006a) but designed to reduce a large bias presented in the previous MLS BrO datasets in the lower stratosphere and, therefore, to increase its useable pressure range. In this new version, vertical profiles of BrO were obtained in the 100 to 4.6 hPa pressure range extending the lower altitude limit of the MLS retrievals. A description of the retrieval methodology and an error analysis are presented. Single daily profile precision, when taking the ascending-descending (day-night) difference, was found to be up to 40 pptv while systematic error biases were estimated to be less than about 3 pptv. Monthly mean comparisons show broad agreement with other measurements as well as with state-of-the-art numerical models. We infer total inorganic Bry using the measured MLS BrO to be 20.3 ± 4.5 pptv, which implies a contribution from Very Short Lived Substances to the stratospheric bromine budget of ∼5 ± 4.5 pptv.
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