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学科主题: 地理学::自然地理学
题名: Chemical composition of size-segregated aerosols in Lhasa city, Tibetan Plateau
作者: 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
通讯作者: Wang, YS ; Cong, ZY
刊名: ATMOSPHERIC RESEARCH
发表日期: 2016
DOI: 10.1016/j.atmosres.2016.02.005
卷: 174, 期:0, 页:142-150
收录类别: SCI
合作性质: 国内
文章类型: Article
英文摘要: To 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.
语种: 英语
WOS记录号: WOS:000372939200015
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7676
Appears in Collections:图书馆_期刊论文

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作者单位: 1.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:
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.
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文件名: V.174 142-150 2016.pdf
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