New Aura Microwave Limb Sounder observations of BrO and implications for Br-y

作者：Millan L^*; Livesey N; Read W; Froidevaux L; Kinnison D; Harwood R; MacKenzie I A; Chipperfield M P

来源：Atmospheric Measurement Techniques, 2012, 5(7): 1741-1751.

DOI：10.5194/amt-5-1741-2012

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 uses a more realistic atmospheric state to constrain the retrieval. A description of the methodology and an error analysis are presented. Single daily profile precision uncertainty, 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 a 2005 yearly total inorganic Br-y 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.

• 出版日期2012