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Residential Wood Burning Aerosol Emissions and Secondary Aerosol Formation in the Wintertime Urban Atmosphere
ANDREW HOLEN, Ryan Cook, Matthew Gunsch, Nathaniel May, Kathryn Kolesar, Kerri Pratt, University of Michigan
Abstract Number: 623
Working Group: Urban Aerosols
Abstract
Wintertime air pollution is gaining attention due to air quality exceedances that impact human health. However, our current understanding is limited in terms of knowledge of primary emission source strengths and secondary aerosol formation. In particular, few studies have been done that examine the composition of individual atmospheric aerosols in urban environments during winter conditions. Therefore, a field campaign was conducted in Ann Arbor, Michigan from Feb. 4 – Mar. 8, 2016. An aerosol time-of-flight mass spectrometer (ATOFMS) was used to measure individual aerosol particle size, chemical composition, and mixing state. An ambient ion monitor – ion chromatography (AIM-IC) system provided online measurements of particulate inorganic ion concentrations. Simultaneous aerosol size distribution measurements were also conducted. Together these methods provided quantitative identification of individual sources, including residential wood burning, vehicle emissions, and road salt aerosol. In addition, we examined the formation of secondary aerosol, including ammonium nitrate. These results provide an improved understanding of wintertime aerosol chemistry in mid-latitude urban environments.