DOI: 10.1016/j.atmosenv.2017.08.047
Scopus记录号: 2-s2.0-85028441482
论文题名: The PM2.5 threshold for aerosol extinction in the Beijing megacity
作者: Kong L ; , Xin J ; , Liu Z ; , Zhang K ; , Tang G ; , Zhang W ; , Wang Y
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 167 起始页码: 458
结束页码: 465
语种: 英语
英文关键词: Aerosol extinction
; Beijing
; PM2.5 threshold
; Pollution control
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Particulate pollution has remained at a high level in the megacity of Beijing in the past decade. The PM2.5, PM10, aerosol optical depth (AOD), Angstrom exponent(α), and PM2.5/PM10 ratio (the proportion of PM2.5 in PM10) in Beijing were 70±6 μg m−3, 128±6 μg m−3, 0.57 ± 0.05, 1.10 ± 0.08, 45 ± 4%, respectively, from 2005 to 2014. The annual means of PM concentration, AOD, α, and PM2.5/PM10 ratio decreased slightly during this decade, meanwhile PM concentration increased in the winter. Furthermore, we found there were thresholds of PM2.5 concentration for aerosol extinction. When the PM concentration was lower than a certain threshold, AOD decreased quickly with the decline of PM concentration. To make the improvement of the particle pollution more noticeable, the PM concentration should be controlled under the threshold. The annual averaged threshold is 63 μg m−3, and the threshold values reached the maximum of 74 μg m−3 in spring, ranged from 54 to 56 μg m−3 in the three other seasons. The threshold values ranged from 55 to 77 μg m−3 under other relevant factors, including air masses directions and relative humidity. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82197
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu, China; College of Atmospheric Sciences, Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Lanzhou University, Lanzhou, China
Recommended Citation:
Kong L,, Xin J,, Liu Z,et al. The PM2.5 threshold for aerosol extinction in the Beijing megacity[J]. Atmospheric Environment,2017-01-01,167