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

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 investi...

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Bibliographic Details
Published in:	Geophysical research letters Vol. 35; no. 20; pp. L20803 - n/a
Main Authors:	Zhou, Xianliang, Davis, Andrew J., Kieber, David J., Keene, William C., Maben, John R., Maring, Hal, Dahl, Elizabeth E., Izaguirre, Miguel A., Sander, Rolf, Smoydzyn, Linda
Format:	Journal Article
Language:	English
Published:	Washington, DC American Geophysical Union 01-10-2008 Blackwell Publishing Ltd
Subjects:	Aerosols and particles Air/sea constituent fluxes Atmospheric Composition and Structure Biological and Chemical Chemical kinetic and photochemical properties Constituent sources and sinks Earth sciences Earth, ocean, space Exact sciences and technology Marine marine aerosol Marine organic chemistry Oceanography particulate organic carbon photochemistry marine aerosol photochemistry particulate organic carbon sea water Sea surface Hydrogen peroxide aerosols solar radiation air Oxidant Photoproduction Uptake in situ extrapolation Photolysis organic materials Hydroxyl radicals bubbles
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Summary:	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 constraints for poorly quantified oxidant sources in marine aerosols.
Bibliography:	istex:8EBE8D7F1B61A53C2B92715CEA7B0BB9330B82C8 Tab-delimited Table 1. ark:/67375/WNG-473ZJV2G-9 ArticleID:2008GL035418 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0094-8276 1944-8007
DOI:	10.1029/2008GL035418