AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
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In-Particle Chemistry and Gas-Particle Partitioning of Isoprene SOA Tracers
ALISON FANKHAUSER, ManishKumar Shrivastava, Gabriel Isaacman-VanWertz, V. Faye McNeill, Columbia University
Abstract Number: 363 Working Group: There Must be Something in the Water: Cloud, Fog and Aerosol Aqueous Chemistry for Aerosol Production
Abstract Understanding the formation and properties of secondary organic aerosol (SOA) formed from the oxidation of isoprene is critically important for air quality and climate. Recent laboratory and field data suggest significant revolatilization of IEPOX SOA tracers with atmospheric aging, while other data indicate lower than expected volatility of isoprene SOA. We use GAMMA 4.0, a recently updated version of the McNeill group model for multiphase SOA formation, to systematically test a series of changes in the chemical mechanism of isoprene SOA formation which impact volatility, including the formation and subsequent decomposition of oligomers and organic-inorganic adducts, and the incorporation of recent laboratory results for the gas-particle partitioning and oxidative revolatilization of 2-methyltetrols. Simulation results are compared to field data from GoAmazon2014/5.