Investigation of chlorine radical chemistry in the Eyjafjallajkull volcanic plume using observed depletions in non-methane hydrocarbons

Baker, A.K., Rauthe-Schch, A., Schuck, T.J., Brenninkmeijer, C.A.M., Van Velthoven, P.F.J., Wisher, A. and Oram, D.E. (2011) Investigation of chlorine radical chemistry in the Eyjafjallajkull volcanic plume using observed depletions in non-methane hydrocarbons. Geophysical Research Letters, 38 (13). L13801. ISSN 0094-8276

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Abstract

As part of the effort to understand volcanic plume composition and chemistry during the eruption of the Icelandic volcano Eyjafjallajkull, the CARIBIC atmospheric observatory was deployed for three special science flights aboard a Lufthansa passenger aircraft. Measurements made during these flights included the collection of whole air samples, which were analyzed for non-methane hydrocarbons (NMHCs). Hydrocarbon concentrations in plume samples were found to be reduced to levels below background, with relative depletions characteristic of reaction with chlorine radicals (Cl). Recent observations of halogen oxides in volcanic plumes provide evidence for halogen radical chemistry, but quantitative data for free halogen radical concentrations in volcanic plumes were absent. Here we present the first observation-based calculations of Cl radical concentrations in volcanic plumes, estimated from observed NMHC depletions. Inferred Cl concentrations were between 1.3 × 10 and 6.6 × 10 Cl cm. The relationship between NMHC variability and local lifetimes was used to investigate the ratio between OH and Cl within the plume, with [OH]/[Cl] estimated to be ∼37. Copyright 2011 by the American Geophysical Union.

Item Type: Article
Faculty \ School:
Faculty of Science
Faculty of Science > School of Environmental Sciences
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Depositing User: Users 2731 not found.
Date Deposited: 29 Jun 2012 11:05
Last Modified: 24 Jul 2019 13:32
URI: https://ueaeprints.uea.ac.uk/id/eprint/39044
DOI: 10.1029/2011GL047571

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