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

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

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3520803z&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 20, CiteID L20803

Mathematics

Logic

4

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Constituent Sources And Sinks, Oceanography: Biological And Chemical: Marine Organic Chemistry (0470, 1050), Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504)

Scientific paper

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.

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