Sulfur isotope measurements of submicrometer sulfate aerosol particles over the Pacific Ocean

Physics

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Aerosols, Air Water Interactions, Pacific Ocean, Sulfur Isotopes, Methyl Compounds, Particle Size Distribution, Salts, Sulfides

Scientific paper

Stable isotopes were used to analyze the submicron-size sulfate aerosol particles in the atmosphere over the Pacific Ocean, together with the air-mass back trajectories, in order to test the hypothesis of Charlson et al. (1987) who suggested that, over the remote ocean areas, the primary source of atmospheric nonseasalt (NSS) sulfate is marine emissions of dimethylsulfide (DMS). The observed results of isotopic fractionation between the seawater sulfate and NSS sulfate fractions was found to be consistent with the isotopic fractionation predicted for the transformation of the seawater sulfate to the atmospheric NSS sulfate via a DMS path way, supporting the hypothesis of Charlson et al.

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