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Fine particles (PM2.5) at a CAWNET background site in Central China: Chemical compositions, seasonal variations and regional pollution events
Abstract Fine particle (PM2.5) samples were collected at Jinsha (JSH), a regional background China Atmosphere Watch Network (CAWNET) site in Central China from March 2012 to March 2013. The mass concentrations of water-soluble inorganic ions (WSIIs), organic carbon (OC) and elemental carbon (EC) in PM2.5 were measured. The average PM2.5 mass concentration was 48.7 ± 26.9 μg m−3, exceeding the Chinese National Ambient Air Quality Standards (NAAQS) (35 μg m−3), implying that PM2.5 is a pollutant of regional concern in Central China. The average concentrations of total WSIIs, OC and EC were 26.1 ± 18.8, 7.5 ± 3.5 and 0.7 ± 0.5 μg m−3, accounting for 53.5%, 15.1% and 1.5% of the PM2.5 concentrations at JSH, respectively. Clear seasonal variations in PM2.5 and the levels of its main chemical species were observed in the following order: winter > autumn > spring > summer. Backward air trajectory analysis and potential source contribution function (PSCF) analysis implied that the areas north and northeast of JSH contributed significantly to the levels of SO4 2−, NO3 −, NH4 + and OC, while sandstorms originating from Mongolia and traveling across Northwest China may have contributed significantly to the levels of Na+, Ca2+, and Mg2+ in PM2.5 at JSH. Two pollution events, related to regional biomass burning and haze, respectively, were recorded at JSH during the sampling campaign.
Highlights PM2.5 is a pollutant of regional concern in Central China. Water-soluble inorganic ion, OC and EC in PM2.5 were measured. Backward air trajectory analysis and PSCF analysis were used to identify potential source. Two pollution events were recorded during the sampling campaign.
Fine particles (PM2.5) at a CAWNET background site in Central China: Chemical compositions, seasonal variations and regional pollution events
Abstract Fine particle (PM2.5) samples were collected at Jinsha (JSH), a regional background China Atmosphere Watch Network (CAWNET) site in Central China from March 2012 to March 2013. The mass concentrations of water-soluble inorganic ions (WSIIs), organic carbon (OC) and elemental carbon (EC) in PM2.5 were measured. The average PM2.5 mass concentration was 48.7 ± 26.9 μg m−3, exceeding the Chinese National Ambient Air Quality Standards (NAAQS) (35 μg m−3), implying that PM2.5 is a pollutant of regional concern in Central China. The average concentrations of total WSIIs, OC and EC were 26.1 ± 18.8, 7.5 ± 3.5 and 0.7 ± 0.5 μg m−3, accounting for 53.5%, 15.1% and 1.5% of the PM2.5 concentrations at JSH, respectively. Clear seasonal variations in PM2.5 and the levels of its main chemical species were observed in the following order: winter > autumn > spring > summer. Backward air trajectory analysis and potential source contribution function (PSCF) analysis implied that the areas north and northeast of JSH contributed significantly to the levels of SO4 2−, NO3 −, NH4 + and OC, while sandstorms originating from Mongolia and traveling across Northwest China may have contributed significantly to the levels of Na+, Ca2+, and Mg2+ in PM2.5 at JSH. Two pollution events, related to regional biomass burning and haze, respectively, were recorded at JSH during the sampling campaign.
Highlights PM2.5 is a pollutant of regional concern in Central China. Water-soluble inorganic ion, OC and EC in PM2.5 were measured. Backward air trajectory analysis and PSCF analysis were used to identify potential source. Two pollution events were recorded during the sampling campaign.
Fine particles (PM2.5) at a CAWNET background site in Central China: Chemical compositions, seasonal variations and regional pollution events
Zhang, Fan (author) / Cheng, Hai-rong (author) / Wang, Zu-wu (author) / Lv, Xiao-pu (author) / Zhu, Zhong-min (author) / Zhang, Gan (author) / Wang, Xin-ming (author)
Atmospheric Environment ; 86 ; 193-202
2013-12-08
10 pages
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2012
| British Library Online Contents | 2018
| British Library Online Contents | 2018