DOI: 10.1016/j.atmosenv.2014.08.079
Scopus记录号: 2-s2.0-84907085687
论文题名: Weekly cycle of magnetic characteristics of the daily PM2.5 and PM2.5-10 in Beijing, China
作者: Shi M ; , Wu H ; , Zhang S ; , Li H ; , Yang T ; , Liu W ; , Liu H
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 98 起始页码: 357
结束页码: 367
语种: 英语
英文关键词: Air pollution
; Beijing
; Magnetic parameters
; PM2.5-10
; PM2.5
; Weekly cycle
Scopus关键词: Beijing
; Beijing , China
; Magnetic characteristic
; Magnetic parameters
; Weekly cycle
; Air pollution
; magnetite
; atmospheric pollution
; automobile
; autumn
; heating
; hysteresis
; magnetic mineral
; magnetic susceptibility
; particulate matter
; remanent magnetization
; saturation
; scanning electron microscopy
; world city
; X-ray spectroscopy
; air pollutant
; air pollution
; Article
; autumn
; China
; exhaust gas
; heating
; hysteresis
; magnetism
; particle size
; particulate matter
; roentgen spectroscopy
; scanning electron microscope
; scanning electron microscopy
; seasonal variation
; spring
; Beijing [China]
; China
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: In recent years, Beijing has been shown to suffer one of the most serious air pollution problems of any major world city. The concentrations of particulate matter (PM) pollutants, PM2.5-10 and PM2.5, are commonly used as air pollution indexes. We conducted a detailed environmental magnetism study to investigate possible sources of air pollution in Beijing, China, using 283 pairs of the PM2.5 and PM2.5-10 samples collected daily from July 2010 to June 2011. Rock magnetic measurements, including magnetic susceptibility, anhysteretic remanent magnetization, isothermal remanent magnetization, saturation isothermal remanent magnetization, hysteresis loops, first-order reversal curves (FORCs), and thermomagnetism, indicate that the main magnetic mineral is low-coercivity pseudo-single domain (PSD) magnetite. Scanning electron microscope (SEM) observations and energy dispersive X-ray spectroscopy (EDS) analyses on the PM indicate that the major magnetic phase is coarse-grained magnetite, which is most likely from automobile exhausts and braking system debris. Magnetic parameters of PM2.5 and PM2.5-10 show significant seasonal patterns that may be attributed to domestic heating enhancing magnetization of the PM during late autumn to early spring. Power spectral analyses and box-whisker plots indicate that the magnetic parameters have strong weekly variations that may be due to traffic emissions. These results indicate that magnetic parameters can be used as efficient proxies for monitoring Beijing's air pollution, and that the atmospheric environment may be improved by controlling vehicle emissions. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80557
Appears in Collections: 气候变化事实与影响
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作者单位: State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, China; School of Ocean Sciences, China University of Geosciences, Beijing, China
Recommended Citation:
Shi M,, Wu H,, Zhang S,et al. Weekly cycle of magnetic characteristics of the daily PM2.5 and PM2.5-10 in Beijing, China[J]. Atmospheric Environment,2014-01-01,98