Photolytic Mass Loss of Secondary Organic Aerosol Derived from Photooxidation of Biomass Burning Furan Precursors
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Shin, Nara
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Abstract
Direct photolysis as a potentially important chemical loss pathway for atmospheric organic aerosol (OA) is increasingly recognized, but remains highly uncertain, particularly for secondary organic aerosol (SOA) derived from biomass-burning (BB) precursors. Here we present the measurements of photolytic mass change of SOA derived from the photooxidation of three furan precursors, 3-methylfuran, 2-methylfuran, and furfural in an environmental chamber for both dry and humid conditions. The SOA was collected on crystal sensors, and the mass losses by photolysis under 300 nm and 340 nm UV were continuously monitored using a highly sensitive quartz-crystal microbalance (QCM). By incorporating measurements and modeling, our results suggest that SOA from furan species can lose 10-40% mass by direct photolysis under solar radiation over their typical tropospheric lifetime. The mass loss fraction is well correlated with the mass fraction of nitrogen-containing compounds, as these species can largely enhance light absorption cross-section and readily undergo photodissociation under UV light.
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2023-07-31
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