title: Roles of SO2 oxidation in new particle formation events.
abstract: The oxidation of SO2 is commonly regarded as a major driver for new particle formation (NPF) in the atmosphere. In this study, we explored the connection between measured mixing ratio of SO2 and observed long-term (duration>3 hr) and short-term (duration<1.5 hr) NPF events at a semi-urban site in Toronto. Apparent NPF rates (J30) showed a moderate correlation with the concentration of sulfuric acid ([H2SO4]) calculated from the measured mixing ratio of SO2 in long-term NPF events and some short-term NPF events (Category I) (R2=0.66). The exponent in the fitting line of J30~[H2SO4]n in these events was 1.6. It was also found that SO2 mixing ratios varied a lot during long-term NPF events, leading to a significant variation of new particle counts. In the SO2-unexplained short-term NPF events (Category II), analysis showed that new particles were formed aloft and then mixed down to the ground level. Further calculation results showed that sulfuric acid oxidized from SO2 probably made a negligible contribution to the growth of >10 nm new particles.
authors: Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China. Electronic address: hemeng@ouc.edu.cn.
authors: He
authors: H
authors: Meng
authors: Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Yujiao
authors: Y
authors: Zhu
authors: Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto M5S 3E5, Canada.
authors: Greg J
authors: GJ
authors: Evans
authors: Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto M5S 3E5, Canada.
authors: Cheol-Heon
authors: CH
authors: Jeong
authors: Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Southern Ontario Centre for Atmospheric Aerosol Research, University of Toronto, Toronto M5S 3E5, Canada. Electronic address: xhyao@ouc.edu.cn.
authors: Xiaohong
authors: X
authors: Yao
mesh_terms: D000392:Air Movements; D000393:Air Pollutants / Q000032:analysis*; D002947:Cities; D004784:Environmental Monitoring; D009864:Ontario; D010084:Oxidation-Reduction; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D013458:Sulfur Dioxide / Q000737:chemistry*; D013997:Time Factors
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D013458:Sulfur Dioxide
keywords: Nucleation; Particle growth; Photochemical oxidation; SO(2); Sulfuric acid