Abstract View
Particle- and Gas-phase Chamber Measurements of Dimethyl Sulfide Oxidation
MATTHEW GOSS, Qing Ye, Gabriel Isaacman-VanWertz, Jesse Kroll, MIT
Abstract Number: 245
Working Group: Aerosol Chemistry
Abstract
Dimethyl sulfide (DMS) is the largest natural source of sulfur and an important source of non-sea salt aerosol over the oceans, however its complete oxidative pathway and ultimate fate are still not fully understood. The recent discovery of hydroperoxymethyl thioformate has highlighted major uncertainties in the DMS oxidation mechanism, particularly under low-NO conditions. Here, we perform high- and low-NOx chamber experiments to examine the formation and transformation of a variety of products from DMS oxidation in the presence of seed particles. Aerosol particles are characterized by an Aerosol Mass Spectrometer (AMS) and complemented by gas-phase mass spectrometric measurements to capture the full distribution of sulfur-containing oxidation products. Specific results include the measurements of multi-generational gas- and particle-phase chemistry, characterization of previously unidentified species in the gas- and particle-phases, and analysis of particle size evolution.