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Environ Pollut

Title:		Evolution of secondary inorganic and organic aerosols during transport: A case study at a regional receptor site
Author(s):		Peng J; Hu M; Gong Z; Tian X; Wang M; Zheng J; Guo Q; Cao W; Lv W; Hu W; Wu Z; Guo S;
Address:		"State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Electronic address: minhu@pku.edu.cn. Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China. Key Laboratory for Urban Habitat Environmental Science and Technology, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China; Zhejiang Province Environment Monitoring Centre, Hangzhou, Zhejiang 310015, China"
Journal Title:		Environ Pollut
Year:		2016
Volume:		20160809
Issue:
Page Number:		794 - 803
DOI:		10.1016/j.envpol.2016.08.003
ISSN/ISBN:		1873-6424 (Electronic) 0269-7491 (Linking)
Abstract:		"Understanding the evolution of aerosols in the atmosphere is of great importance for improving air quality and reducing aerosol-related uncertainties in global climate simulations. Here, a unique haze episode at a regional receptor site near the East China Sea was examined as a case study of the aging process of atmospheric aerosols during transport. An increase in photochemical age from 5 h to more than 25 h and a progressive increase in the fitted mean particle diameter from 70 nm to approximately 300 nm were observed. According to the pollution features and meteorology conditions involved, pollution accumulation (PA), sea breeze (SB), and land breeze (LB) periods were identified. Concentrations of black carbon (BC), hydrocarbon-like organic aerosols (HOA), semi-volatile oxidized organic aerosols (SV-OOA), and nitrate increased by 7-fold up to 39-fold when the air masses passed through Taizhou, a nearby city. In addition, nitrate and SV-OOA dominated the aerosol composition in the urban outflow plumes (52% and 18%, respectively), yet they gradually decreased in concentration during transport. In contrast, sulfate and the low-volatile oxidized organic aerosols (LV-OOA) exhibited more regional footprints and potentially have similar formation mechanisms. The atomic oxygen-to-carbon (O/C) ratio also increased from 0.45 to 0.9, thereby suggesting that rapid formation of highly oxidized secondary organic aerosols (SOA) occurred during transport. Overall, these results provide valuable insight into the evolution of the chemical and physical features of aerosol pollution during transport and also highlight the need for regulatory controls of nitrogen oxides, sulfur dioxide, and VOCs to improve air quality on different scales"
Keywords:		Aerosols Air Pollutants/*analysis Air Pollution/analysis *Atmosphere Carbon/analysis China Cities *Climate Hydrocarbons/analysis Nitrates/analysis Oceans and Seas Organic Chemicals/*analysis Rivers Soot/*analysis Sulfates/*analysis Volatile Organic Compou;
Notes:		"MedlinePeng, Jianfei Hu, Min Gong, Zhaoheng Tian, Xudong Wang, Ming Zheng, Jing Guo, Qingfeng Cao, Wei Lv, Wei Hu, Weiwei Wu, Zhijun Guo, Song eng England 2016/08/16 Environ Pollut. 2016 Nov; 218:794-803. doi: 10.1016/j.envpol.2016.08.003. Epub 2016 Aug 9"