The variation of chemical characteristics of PM2.5 and PM10 and formation causes during two haze pollution events in urban Beijing, China

doi:10.1016/j.atmosenv.2015.02.022

CORC > 北京大学 > 环境科学与工程学院

	The variation of chemical characteristics of PM2.5 and PM10 and formation causes during two haze pollution events in urban Beijing, China
	Gao, Jiajia ; Tian, Hezhong ; Cheng, Ke ; Lu, Long ; Zheng, Mei ; Wang, Shuxiao ; Hao, Jiming ; Wang, Kun ; Hua, Shenbing ; Zhu, Chuanyong ; Wang, Yong
刊名	大气环境
	2015
DOI	10.1016/j.atmosenv.2015.02.022
英文摘要	Airborne particles in urban Beijing during haze days and normal days were collected and analyzed in the autumn and winter seasons to reveal the chemical characteristics variations of air pollution. The air quality in haze days was substantially worse than that in normal days. Both the relatively low wind speed and high relative humidity were in favor of the accumulation of pollution species and new formation of secondary PM2.5 in the atmosphere. Elevated concentrations of elements and water-soluble inorganic ions were found on haze days for both PM10 and PM2.5. Particularly, the crustal element, such as Fe, in both PM10 and PM2.5 were substantially higher in autumn normal days and winter haze days than those in autumn haze days and winter normal days, indicating that the abundance of Fe in autumn haze days mainly be originated from crustal dust while in winter haze days it might be primarily emitted from anthropogenic sources (iron and steel smelting) instead of road dust. Secondary ion species (SO42-, NO3-, NH4+) in particles were generated much more during haze episodes, and contributed a higher proportion in PM2.5 than in PM10 during the two sampling periods. Moreover, HYSPLIT model was used to explain the possible transport of airborne particles from distant sources. By comparing with south-type trajectory, west-type trajectory entrained larger amounts of primary crustal pollutants, while, south-type trajectory was comprised of a higher mass of anthropogenic pollution species. The results of back trajectory analysis indicated that the elevated concentration of aerosol and its chemical components during haze days might be caused by the integrated effects of accumulation under stagnant meteorological condition and the transport emissions of pollutants from anthropogenic sources surrounding Beijing city. ? 2015.; SCI(E); EI; 0; ARTICLE; hztian@bnu.edu.cn; 1-8; 107
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/263550]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Gao, Jiajia,Tian, Hezhong,Cheng, Ke,et al. The variation of chemical characteristics of PM2.5 and PM10 and formation causes during two haze pollution events in urban Beijing, China[J]. 大气环境,2015.
APA	Gao, Jiajia.,Tian, Hezhong.,Cheng, Ke.,Lu, Long.,Zheng, Mei.,...&Wang, Yong.(2015).The variation of chemical characteristics of PM2.5 and PM10 and formation causes during two haze pollution events in urban Beijing, China.大气环境.
MLA	Gao, Jiajia,et al."The variation of chemical characteristics of PM2.5 and PM10 and formation causes during two haze pollution events in urban Beijing, China".大气环境 (2015).