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Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau
Wan, X (Wan, Xin)1,5; Kang, SC (Kang, Shichang)2,3; Xin, JY (Xin, Jinyuan)4; Liu, B (Liu, Bin)1; Wen, TX (Wen, Tianxue)4; Wang, PL (Wang, Pengling)6; Wang, YS (Wang, Yuesi)4; Cong, ZY (Cong, Zhiyuan)1,3; Wang, YS; Cong, ZY
AbstractTo reveal the chemical characteristics of size-segregated aerosols in the high-altitude city of Tibetan Plateau, eight-size aerosol samples were collected in Lhasa from March 2013 to February 2014. The annual mean of online PM2.5 was 25.0 +/- 16.0 mu g m(-3), which was much lower than Asian cities but similar with some European cities. The annual mean concentrations of organic carbon (OC, 7.92 mu g m(-3) in PM2.1 and 12.66 mu g m(-3) in PM9.0) and elemental carbon (EC, 1.00 mu g m(-3) in PM2.1 and 1.21 mu g m(-3) in PM9.0) in Lhasa aerosols were considerably lower than those heavily polluted cities such as Beijing and Xi'an, China and Kathmandu, Nepal. Sulfate, NO3-, NH4+ and Ca-2(+) were 0.75 +/- 031, 0.82 +/- 0.35, 0.38 +/- 0.34 and 0.57 +/- 0.29 mu g m(-3) in fine particles while in coarse particles they were 0.57 +/- 037, 0.73 +/- 0.23, 0.07 +/- 0.03 and 2.52 +/- 137 mu g m(-3), respectively. Secondary water-soluble ions composed 35.8% of the total ionic components in fine particles according to the established electroneutrality, while in coarse particles they took up only 93%. Ca2+ (40.6%) was the major component of the coarse particles. For seasonality, the concentrations of OC, EC, SO42-, K+, Ca2+, Mg2+, Cl- and Na+ presented higher values during late autumn and winter but were relatively lower in spring and summer. Nevertheless, NOT was considerably higher in summer and autumn, presumably due to increased tourist-vehicle emissions. During winter and spring, [Ca2+]/[NO3-+SO4-] ratios in coarse particles showed higher values of 7.31 and 6.17, respectively, emphasizing the dust influence. [NO3-]/[SO42-] ratios in fine particles during spring, summer and autumn exceeding 1 indicated that the currently predominant vehicle exhaust makes a greater contribution to the aerosols. While more stationary sources such as coal and biomass burning existed in winter since the [NO3-]/[SO42-] ratio was less than 1. Different sources and formation processes lead to a bimodal size distribution (0-0.65 mu m in fine particles and 4.7-9.0 mu m in coarse particles) for all of the compounds except Na+. (C) 2016 Elsevier B.V. All rights reserved.
Subject Area自然地理学
WOS IDWOS:000372939200015
Indexed BySCI
KeywordHigh-altitude Site Soluble Inorganic-ions Carbonaceous Aerosols Spatial/temporal Variability Wet Deposition Trace-elements Brown Carbon Black Carbon Urban Sites China
Cooperation Status国内
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Cited Times:19[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorWang, YS; Cong, ZY
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China
5.UCAS, Beijing 100049, Peoples R China
6.China Meteorol Adm, Natl Climate Ctr, Beijing 100081, Peoples R China
Recommended Citation
GB/T 7714
Wan, X ,Kang, SC ,Xin, JY ,et al. Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau[J]. ATMOSPHERIC RESEARCH,2016,174(0):142-150.
APA Wan, X .,Kang, SC .,Xin, JY .,Liu, B .,Wen, TX .,...&Cong, ZY.(2016).Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau.ATMOSPHERIC RESEARCH,174(0),142-150.
MLA Wan, X ,et al."Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau".ATMOSPHERIC RESEARCH 174.0(2016):142-150.
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