10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Aerosol Sources and Processes in Winter in Beijing: Insights from Aerosol Mass Spectrometry
YELE SUN, Zifa Wang, Pingqing Fu, Qingqing Wang, Wei Du, Weiqi Xu, Jian Zhao, Wei Zhou, Institute of Atmospheric Physics, CAS
Abstract Number: 145 Working Group: Source Apportionment
Abstract Winter has the worst air pollution in a year in the megacity of Beijing, yet our knowledge on the sources, formation mechanisms and evolution of aerosol particles is far from complete. Here we present the results from several winter campaigns that were conducted in urban Beijing from 2011 using an Aerosol Chemical Speciation Monitor and a High Resolution Aerosol Mass Spectrometer. The sources of organic aerosol (OA) have been fully characterized using positive matrix factorization and multilinear engine. The composition and variations of primary OA (POA), e.g., from coal combustion, cooking, and biomass burning emissions, and different types of secondary OA (SOA), and their roles in severe haze pollution are elucidated. Further, the effects of photochemical and aqueous-phase processing on SOA composition, oxidation states, and evolution processes are characterized. In addition, real-time aerosol particle composition measurements were also conducted at two different heights on a meteorological tower by using two aerosol mass spectrometers. The vertical differences in aerosol composition and sources, and its interactions with boundary layer dynamics will be presented.