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Photolytic Mass Loss of Secondary Organic Aerosol (SOA) Derived from Furan Species
NARA SHIN, Yuchen Wang, Taekyu Joo, Nga Lee Ng, Pengfei Liu, Georgia Institute of Technology
Abstract Number: 576
Working Group: Wildfire Aerosols
Abstract
Biomass burning (BB) is one of the major global sources of primary organic aerosols and volatile organic compound (VOC)precursors which can produce secondary organic aerosols (SOA). These organic aerosol particles undergo further chemical processes in the atmosphere that result in changes in their mass concentration and physicochemical properties. One process involves photolysis in the particulate phase, which has been identified as a loss pathway of organic aerosols. However, this pathway can be confounded by other processes, such as photo-oxidation, in typical chamber experiments. In this study, we investigate the effect of photolysis on the mass of SOA formed by the oxidation of furan species. Furan compounds are known as a significant part of non-methane hydrocarbons and methylfuran is one of the major furans emitted from BB. The SOA produced by OH oxidation of furan species using an Oxidation Flow Reactor (OFR) and Georgia Tech Environmental Chamber are deposited onto a quartz crystal substrate and the mass-loss rates of SOA under specific UV wavelengths (300 and 340 nm) are measured using a Quartz Crystal Microbalance (QCM). During 48-h photolysis experiments on furan-derived SOA, we observed significant mass losses under two different wavelengths (300nm and 340nm), with a relatively higher mass-loss fraction at 300 nm wavelength than 340 nm. This study shows that particulate phase photolysis can be a potential fate and loss mechanism of BB-derived SOA in the ambient condition.