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Start Over Author "Sun, Yele" Journal atmospheric environment
45 results on '"Sun, Yele"'

33. Corrigendum to “Highly time- and size-resolved characterization of submicron aerosol particles in Beijing using an Aerodyne Aerosol Mass Spectrometer” [Atmos. Environ. 44 (2010) 131–140]

Author

Sun, Junying, primary, Zhang, Qi, additional, Canagaratna, Manjula R., additional, Zhang, Yangmei, additional, Ng, Nga L., additional, Sun, Yele, additional, Jayne, John T., additional, Zhang, Xiaochun, additional, Zhang, Xiaoye, additional, and Worsnop, Douglas R., additional

Published
2012
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44. Characteristics and sources of polycyclic aromatic hydrocarbons and fatty acids in PM2.5 aerosols in dust season in China

Author

Hou, Ximei, Zhuang, Guoshun, Sun, Yele, and An, Zhisheng

Subjects
*DUST storms, *WIND erosion, *HYDROCARBONS, *FATTY acids
Abstract

Abstract: The concentrations and distributions of 10 polycyclic aromatic hydrocarbons (PAHs) and seven fatty acids (FAs) in PM2.5 collected in dust season in six sites located in the source regions and on the pathway of the two dust storm episodes over China in 2004 were observed. The average concentrations of the total PAHs in Beijing were ∼10 times higher than those measured in 1980s, indicating that the PAH pollution has been much aggravated due to the rapid development and the motorization in the past 20 years. In non-dust storm days, the highest PAH was found at Yulin (YL) in the dust source region, as there are three large coal mines located around YL. The characteristic ratios of the individual PAH at the six sites indicated that coal combustion and traffic emission were the major contributors to PAHs in urban areas. The high abundances of oleic acid and linoleic acid in the aerosols suggested that cooking emission was the main source of FAs in urban areas. In dust storm episodes, the total concentrations of PAHs and FAs decreased sharply after the dust storm, while the ratios of PAH/PM2.5 and FAs/PM2.5 increased, demonstrating that the organic pollutants were cleared out through deposition or transport of the dust particles after dust episodes passed. The ratio of PAH(4)/PAH(5,6) was developed to be a tracer to deduce the sources of PAHs in the aerosols based on the different environmental behavior of PAH(4) and PAH(5,6) during the long-range transport. The higher ratios of PAH(4)/PAH(5,6) in BNU-DE2 suggested that the PAHs in the dust aerosols in the urban area in the dust storm episode were from the long-range transport, whereas the lower ratios in YL-DE2 and DL-DE2, which were similar to the ratios in non-dust days, implied that the local emission contributed greatly to the organic pollutants in the aerosols in the dust source regions. The ratio of FAs, C18:1/C18:0, could also be used to trace the sources of the organic pollutants in the dust storm episode. [Copyright &y& Elsevier]

Published
2006
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45. The ion chemistry and the source of PM2.5 aerosol in Beijing

Author

Wang, Ying, Zhuang, Guoshun, Tang, Aohan, Yuan, Hui, Sun, Yele, Chen, Shuang, and Zheng, Aihua

Subjects
*AEROSOLS, *AIR pollution, *SOLAR radiation
Abstract

Abstract: Daily PM2.5 aerosol samples were collected at five sites in Beijing for a 3-year period from 2001 to 2003. Concentrations of the water-soluble ions (SO4 2−, NO3 −, Cl−, F−, PO4 3−, NO2 −, CH3COO−, HCOO−, MSA, C2O4 2−, NH4 +, Ca2+, K+, Mg2+, Na+) and 23 elements were measured for a total of 334 samples. A relatively even spatial distribution throughout Beijing and a significant seasonal variation were observed. SO4 2−, NO3 −, Cl−, NH4 +, Ca2+, and K+ were the major ions and existed mainly in the form of (NH4)2SO4, NH4NO3, NaCl, KCl, and CaCl2 in aerosol particles. Most ions showed high concentrations in winter and low in summer. Secondary ions, mainly SO4 2−, NO3 −, exhibited high concentrations in both summer and winter due to the secondary transformation accelerated under high humidity and strong solar radiation in summer and the higher concentration of SO2 from coal burning and the lower removal rate in winter. The formations of SO4 2− and NO3 − were determined largely by temperature and NH4 +, respectively. Temperature, relative humidity, rainwater frequency, and air mass origin might be the main factors regulating the aerosol distribution. Crustal ions exhibited sporadic but high peaks in spring due to the intrusion of dust from west and northwest of China. The Ca2+/Al ratio was used to indicate the mixing of different dust sources. Factor analysis showed that the secondary formation of coal/biomass burning products, crust, industrial and traffic emissions were the major sources of the fine aerosols in Beijing. Traffic source became more significant with motorization in recent years. [Copyright &y& Elsevier]

Published
2005
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