TY - JOUR
T1 - Fine particles (PM2.5) at a CAWNET background site in Central China
T2 - Chemical compositions, seasonal variations and regional pollution events
AU - Zhang, Fan
AU - Cheng, Hai-rong
AU - Wang, Zu-wu
AU - Lv, Xiao-pu
AU - Zhu, Zhong-min
AU - Zhang, Gan
AU - Wang, Xin-ming
N1 - Funding Information:
This work was supported by the Natural Science Foundation of China (NSFC) (Grant No. 41103061 ), the Doctoral Fund Project of the Ministry of Education of China (Grant No. 20110141120015 ), and the National 973 programme (Grant No. 2011CB707106 ). The authors are grateful for the National Oceanic and Atmospheric Administration's Air Resources Laboratory to provide the HYSPLIT transport model and the READY website ( http://www.arl.noaa.gov/ready.html ).
PY - 2014/4
Y1 - 2014/4
N2 - 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±26.9μgm-3, exceeding the Chinese National Ambient Air Quality Standards (NAAQS) (35μgm-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±0.5μgm-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 SO42-, 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.
AB - 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±26.9μgm-3, exceeding the Chinese National Ambient Air Quality Standards (NAAQS) (35μgm-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±0.5μgm-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 SO42-, 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.
KW - Back trajectory
KW - Background
KW - Long-range atmospheric transport
KW - PM2.5
KW - Pollution events
KW - Potential source contribution function (PSCF)
UR - http://www.scopus.com/inward/record.url?scp=84892975276&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2013.12.008
DO - 10.1016/j.atmosenv.2013.12.008
M3 - Journal article
AN - SCOPUS:84892975276
SN - 1352-2310
VL - 86
SP - 193
EP - 202
JO - Atmospheric Environment
JF - Atmospheric Environment
ER -