We use observations of the mass-independent oxygen isotopic composition (D 17 O) of sulfate in the marine boundary layer (MBL) to quantify the sulfate source from aqueous SO 2 (S(IV)) oxidation by O 3 in alkaline sea-salt aerosols. O values are associated with high concentrations of sea-salt aerosols, providing evidence for the S(IV) + O 3 pathway. We use a global chemical transport model (GEOS-CHEM) to interpret quantitatively the INDOEX observations and to assess the global importance of sulfate pr…
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