| Title: | Anthropogenic Pollutants Induce Changes in Peroxyacetyl Nitrate Formation Intensity and Pathways in a Mountainous Background Atmosphere in Southern China |
| Author(s): | Wang Y; Liu T; Gong D; Wang H; Guo H; Liao M; Deng S; Cai H; Wang B; |
| Address: | "Australia-China Centre for Air Quality Science and Management (Guangdong), Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China. Guangdong Provincial Observation and Research Station for Atmospheric Environment and Carbon Neutrality in Nanling Forests, Guangzhou 511443, China. Air Quality Studies, Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China. Research Institute for Land and Space, The Hong Kong Polytechnic University, Kowloon 999077, Hong Kong, China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Mountainous background areas are typically considered to have a clean atmosphere where peroxyacetyl nitrate (PAN) can be decomposed. This study demonstrated that PAN was photochemically formed with a simulated production rate of 0.28 +/- 0.06 ppbv h(-1) in the Nanling mountains (1690 m a.s.l.) of South China and that net PAN formation was dependent on both volatile organic compounds (VOCs) and NO(x) precursors (transition regime). In contrast to dominated acetaldehyde oxidation in previous urban and rural research, PAN at Nanling was primarily formed by methylglyoxal (38%), acetaldehyde (28%), radicals (20%), and other oxygenated volatile organic compounds (OVOCs) (13%). Moreover, when polluted air masses invaded the Nanling mountains, the PAN production rate was altered, primarily because anthropogenic aromatics intensified PAN formation via the oxidized pathways of methylglyoxal, other OVOCs, and radicals. Finally, net PAN formation at Nanling reduced the hydroxyl radical level by consuming NO(x), impaired local radical cycling, and thereby suppressed local O(3) production. This suppressing effect was exacerbated on polluted days. The findings of this study deepen our understanding of PAN photochemistry and the impact of anthropogenic intrusions on the background atmosphere of mountainous regions" |
| Keywords: | *Environmental Pollutants *Air Pollutants/analysis *Volatile Organic Compounds/analysis Pyruvaldehyde China Atmosphere/chemistry Acetaldehyde *Ozone/analysis Environmental Monitoring aldehydes master chemical mechanism ozone radical cycling volatile organ; |
| Notes: | "MedlineWang, Yu Liu, Tao Gong, Daocheng Wang, Hao Guo, Hai Liao, Minping Deng, Shuo Cai, Huang Wang, Boguang eng Research Support, Non-U.S. Gov't 2023/04/06 Environ Sci Technol. 2023 Apr 18; 57(15):6253-6262. doi: 10.1021/acs.est.2c02845. Epub 2023 Apr 5" |
