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Sulfate formation in sea-salt aerosols: Constraints from oxygen isotopes

Summary: Sulfate formation in sea-salt aerosols:
Constraints from oxygen isotopes
B. Alexander,1
R. J. Park, D. J. Jacob, Q. B. Li,2
and R. M. Yantosca
Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University,
Cambridge, Massachusetts, USA
J. Savarino,3
C. C. W. Lee,4
and M. H. Thiemens
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California, USA
Received 30 November 2004; revised 23 February 2005; accepted 15 March 2005; published 25 May 2005.
[1] We use observations of the mass-independent oxygen isotopic composition (D17
of sulfate in the marine boundary layer (MBL) to quantify the sulfate source from
aqueous SO2 (S(IV)) oxidation by O3 in alkaline sea-salt aerosols. Oxidation by O3
imparts a large D17
O signature to the resulting sulfate (8.8%) relative to oxidation by
H2O2 (0.9%) or by OH or O2 (0%). Ship data from two Indian Ocean Experiment
(INDOEX) cruises in the Indian Ocean indicate D17


Source: Alexander, Becky - Department of Atmospheric Sciences, University of Washington at Seattle


Collections: Environmental Sciences and Ecology; Geosciences