AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Modeling Aqueous Organic Aerosol Chemistry: Photosensitizers and the Oxidizing Power of the Aqueous Phase
V. FAYE MCNEILL, Wanyi Li, William Tsui, Alison Fankhauser, Nabil Khan, Kayane Dingilian, Hai-Lung Dai, Yi Rao, Columbia University
Abstract Number: 120 Working Group: Aerosol Chemistry
Abstract Light-absorbing organic species in atmospheric aerosols may act as photosensitizers, directly oxidizing organic species or forming oxidants such as HO2. This chemistry may contribute to the formation of secondary organic aerosol (SOA) material, but additional insight into the mechanisms and kinetics of these processes is required so that we may evaluate the relative importance of this pathway. We will present data and insight from laboratory studies of the photosensitizer chemistry of imidazole-2-carboxaldehyde and an analysis of published laboratory data for photosensitized SOA growth using our photochemical box model, GAMMA. GAMMA results demonstrating the potential impact of this chemistry in the environmental context will also be presented.