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BrO formation in volcanic plumes

Research output: Contribution to journalArticle

Published copy (DOI)

Author(s)

  • Clive Oppenheimer
  • Vitchko I. Tsanev
  • Christine F. Braban
  • Richard A. Cox
  • Jonathan W. Adams
  • Alessandro Aiuppa
  • Nicole Bobrowski
  • Pierre Delmelle
  • Jenni Barclay
  • Andrew J. S. McGonigle

Department/unit(s)

Publication details

JournalGeochimica et Cosmochimica Acta
DatePublished - 15 Jun 2006
Issue number12
Volume70
Number of pages7
Pages (from-to)2935-2941
Original languageEnglish

Abstract

Volcanoes have only recently been recognized as a potentially major source of reactive bromine species to the atmosphere, following from the detection of bromine monoxide (BrO) in the plume emitted by Soufriere Hills Volcano, Montserrat. However, BrO is not expected to be emitted in significant quantity from magma, presenting a puzzle regarding its formation. We report here new field measurements of the tropospheric plume emitted by Mt. Etna, Italy, which provide the first direct evidence of fast oxidation of halogen species in a volcanic plume, and lead to an explanation of how BrO is generated from magmatic HBr emissions. We show that the timescale of BrO formation (a few minutes after emission into the atmosphere) is consistent with rapid heterogeneous halogen chemistry involving sulphate aerosol in the plume. The model highlights considerable complexity to the oxidative chemistry of volcanic plumes. (c) 2006 Elsevier Inc. All rights reserved.

    Research areas

  • SULFURIC-ACID-SOLUTIONS, MOUNT-ETNA, BROMINE PHOTOCHEMISTRY, ART., TROPOSPHERE, AEROSOL, HOBR, HCL

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