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First satellite detection of volcanic OClO after the eruption of Puyehue-Cordon Caulle

par Theys, Nicolas ;De Smedt, Isabelle ;Van Roozendael, Michel ;Froidevaux, Lucien;Clarisse, Lieven ;Hendrick, François
Référence Geophysical Research Letters, 41, 2, page (667-672)
Publication Publié, 2014

Article révisé par les pairs

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Résumé :

Volcanoes release large amounts of halogen species such as HCl and HBr, which can be converted into reactive halogens by heterogeneous photochemical reactions that are currently not fully characterized. Here we report on the first satellite detection of volcanic chlorine dioxide (OClO). Measurements were performed using the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography instrument for the ash-laden plume emitted after the 2011 eruption of Puyehue-Cordõn Caulle in Chile. We also identified volcanic BrO using the Ozone Monitoring Instrument, as well as enhanced HCl in data of the Microwave Limb Sounder instrument. These observations suggest that OClO was formed in the plume by the ClO + BrO reaction in presence of a large excess of ClO. The present satellite data set could help better understand reactive halogen chemistry in volcanic plumes and its impact on atmospheric composition. ©2013. American Geophysical Union. All Rights Reserved.