AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Modeling the Production of Secondary Organic Aerosol Material Via Photosensitized Reactions of Imidazole-2-carboxaldehyde
WILLIAM TSUI, V. Faye McNeill, Columbia University
Abstract Number: 664 Working Group: Aerosol Chemistry
Abstract We have used GAMMA, a photochemical box model with coupled, detailed gas-phase and aqueous-phase chemistry, to simulate the production of secondary organic aerosol material via photoactivated reactions of imidazole-2-carboxaldehyde (IC) in the presence of volatile organic compounds. We use kinetic parameters and mechanisms for IC aqueous reactions with VOCs and O$_2 based on our laboratory measurements, and compare modeling output to the laboratory data of Aregahegn et al. (Faraday Discuss., 2013). We show that SOA production via photosensitized pathways via IC primarily occurs at or near the particle surface. We report reactive uptake coefficients for laboratory and ambient conditions, and simulate IC-SOA production in the ambient environment.