Photochemical production of hydroxyl radical and hydroperoxides in water extracts of nascent marine aerosols produced by bursting bubbles from Sargasso seawater

Zhou, Xianliang, Davis, Andrew J., Kieber, David J., Keene, William C., Maben, John R., Maring, Hal, Dahl, Elizabeth E., Izaguirre, Miguel A., Sander, Rolf and Smoydzyn, Linda (2008) Photochemical production of hydroxyl radical and hydroperoxides in water extracts of nascent marine aerosols produced by bursting bubbles from Sargasso seawater. Geophysical Research Letters, 35 (20). ISSN 1944-8007

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Abstract

Marine aerosols produced by bursting bubbles at the ocean surface are highly enriched in organic matter (OM) relative to seawater. The importance of this OM in the photochemical evolution of marine aerosols, particularly as a source of reactive oxidants, is unknown but likely significant. To investigate oxidant production, nascent aerosols were generated by bubbling zero air through flowing Sargasso seawater and photochemical production of OH radical and hydroperoxide were quantified in aqueous aerosol extracts exposed to solar radiation. Extrapolation to ambient conditions indicates that OM photolysis was the primary in situ source for both OH (1.1 × 10-8 M s-1) and hydroperoxides (1.7 × 10-8 M s-1) in nascent aerosols; NO3- photolysis was the primary source in aged, acidified aerosols (1.4 × 10-7 and 4.1 × 10-8 M s-1, respectively). In situ OH photoproduction was comparable to gas-phase uptake whereas H2O2 photoproduction was slower. Results provide important constraiqs for poorly quantified oxidant sources in marine aerosols.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
Depositing User: Rosie Cullington
Date Deposited: 26 Feb 2011 12:28
Last Modified: 24 Jul 2019 15:19
URI: https://ueaeprints.uea.ac.uk/id/eprint/24714
DOI: 10.1029/2008GL035418

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