气候变化领域集成服务门户(CCPortal): Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau

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DOI	10.1029/2019JD031226
	Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau
	Xu J.; Hettiyadura A.P.S.; Liu Y.; Zhang X.; Kang S.; Laskin A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:1
英文摘要	In this study, PM2.5 filter samples were collected from two high-elevation sites located in the southern and northern areas of Tibetan Plateau (TP): the Qomolangma Station for Atmospheric Environmental Observation and Research (QOMS) and Waliguan Baseline Observatory (WLG), respectively. Collected samples were analyzed to examine the regional differences in aerosol properties and relate them to potential chemical processes in the TP area. The aerosol mass concentrations inferred from measured chemical components were higher at WLG (11.2 μg m−3) compared to QOMS (6.8 μg m−3). The chemical composition shows higher contribution of organic aerosol at QOMS than that of WLG. The optical properties of water-soluble organic carbon (WSOC) from the QOMS samples show higher light absorption efficient than those collected at WLG. The light absorption of WSOC at QOMS indicates significant pH dependence with enhanced light absorption at higher pH values, while the light absorption of WSOC from WLG samples show very weak pH dependence. The different pH dependence property suggests the different chemical composition between them. The molecular-level chemical composition investigated using high-resolution mass spectrometry (HRMS) assisted with an electrospray ionization (ESI) shows significant differences in WSOC composition representative of two sampling sites. For QOMS samples, CHO and CHON compounds are the major chemical species detected in the negative (−) ESI mode, while CHO and CHOS compounds are the most abundant chemical species detected by the same method in samples collected at WLG. The differences in their molecular composition indicate the different sources and chemical processes in these two regions. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	aerosol; chemical composition; high-resolution mass spectrometry; light absorption; photolysis; Tibetan Plateau
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186246
作者单位	State Key Laboratory Cryopheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Science, Lanzhou, China; Department of Chemistry, Purdue University, West Lafayette, IN, United States
推荐引用方式 GB/T 7714	Xu J.,Hettiyadura A.P.S.,Liu Y.,et al. Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2020,125(1).
APA	Xu J.,Hettiyadura A.P.S.,Liu Y.,Zhang X.,Kang S.,&Laskin A..(2020).Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau.Journal of Geophysical Research: Atmospheres,125(1).
MLA	Xu J.,et al."Regional Differences of Chemical Composition and Optical Properties of Aerosols in the Tibetan Plateau".Journal of Geophysical Research: Atmospheres 125.1(2020).