DOI: 10.1002/2013JD020106
论文题名: PM<inf>2.5</inf> mass, chemical composition, and light extinction before and during the 2008 Beijing Olympics
作者: Li X. ; He K. ; Li C. ; Yang F. ; Zhao Q. ; Ma Y. ; Cheng Y. ; Ouyang W. ; Chen G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 21 起始页码: 12158
结束页码: 12167
语种: 英语
英文关键词: Beijing Olympics
; chemical composition
; light extinction
; visibility impairment
Scopus关键词: Aerosols
; Air quality
; Emission control
; Light extinction
; Particulate emissions
; 2008 beijing olympic games
; Chemical compositions
; Emission control measures
; Light scattering coefficient S
; Olympics
; Secondary inorganic aerosol
; Visibility degradation
; Visibility impairment
; Visibility
; air quality
; atmospheric pollution
; black carbon
; chemical composition
; light scattering
; megacity
; particle size
; particulate matter
; spatiotemporal analysis
; visibility
; Beijing [China]
; China
英文摘要: Distinct contrast of air quality and visibility before and during the 2008 Beijing Olympic Games provides a rare opportunity to investigate the links between PM2.5 mass, chemical composition, and light extinction in this megacity. Twenty-four hour integrated PM2.5 samples were collected, and light scattering coefficients and the concentrations of black carbon were measured at urban Beijing for this purpose during a measurement campaign from 1 July to 20 September 2008, which was classed into four stages according to the levels of emission control measures. Daily PM2.5 concentrations ranged from 15.9 to 156.7 μg m-3 with an average of 66.0 ± 35.1 μg m-3. The average PM2.5 mass during the Olympics decreased by 49% from the second stage (20 July to 7 August), mainly due to the reduction of secondary inorganic aerosols (i.e., sulfate, nitrate, and ammonium (SNA)). The counterintuitive increase of PM 2.5 mass (by 27% on average) during the second stage with two most serious haze episodes, although more rigorous emission control measures were in place, compared to the first stage (1-19 July), was mainly explained by the unfavorable meteorology and input of sulfate aerosols. A daily PM2.5 mass threshold of 50 μg m-3 was extracted for frequent haze occurrence. The extinction fractions of SNA and organic material were each approximately 30% during the 20% best visibility days but changed to 81.7% and 8.4%, respectively, during the 20% worst visibility days. The results indicated that the role of SNA was magnified in haze formation during the 2008 summer in Beijing. Key Points The dramatic PM2.5 mass decrease was mainly due to secondary inorganic species The threshold of PM2.5 concentration for the hazy day occurrence was estimated Ammonium sulfate was the largest single contributor to visibility degradation ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 41075093
; 41375123
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63195
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Chemistry and Environment, Beihang University, Beijing, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China; School of Physics, Peking University, Beijing, China; Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China; Chongqing Institute of Environmental Sciences, Chongqing, China
Recommended Citation:
Li X.,He K.,Li C.,et al. PM<inf>2.5</inf> mass, chemical composition, and light extinction before and during the 2008 Beijing Olympics[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(21)