气候变化领域集成服务门户(CCPortal): Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.)

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DOI	10.1016/j.atmosres.2014.08.008
	Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.)
	Wan, Xin; Kang, Shichang; Wang, Yuesi; Xin, Jinyuan; Liu, Bin; Guo, Yuhong; Wen, Tianxue; Zhang, Guoshuai; Cong, Zhiyuan
发表日期	2015
ISSN	0169-8095
EISSN	1873-2895
卷号	153
英文摘要	The chemical composition and size distribution characteristics of atmospheric aerosols have important effects on the environment, human health and climate change. In this paper, we study the size distribution of carbonaceous aerosols at the remote and pristine site, Nam Co Monitoring and Research Station for Multisphere Interactions, in the inland Tibetan Plateau (TP) based on collected size-segregated aerosols during 2012. The samples were quantified using the thermal/optical (TOR) method. The overall average concentrations of OC and EC in TSP, PM9.0, PM2.1, and PM1.0 were 4.61 mu g m(-3) and 0.19 mu g m(-3), 4.52 mu g m(-3) and 0.18 mu g m(-3), 2.72 mu g m(-3) and 0.11 mu g m(-3), and 2.11 mu g m(-3) and 0.09 mu g m(-3), respectively. Generally, the highest concentration of OC and EC in different aerosol size occurred during winter. The low level of EC indicated that direct anthropogenic disturbances in the interior of the TP still remain insignificant. The size distributions of OC and EC concentrations presented bimodal variations. In winter, pre-monsoon, monsoon, and post-monsoon seasons, the peaks for OC were in droplet mode (0.43-0.65 mu m) and coarse mode (4.7-5.8 mu m); while in the monsoon period, the coarse mode shifted to a smaller size bin (3.3-4.7 mu m). The coarse mode may be due to dust particles while the droplet mode may be due to the growth process of particles. For EC, the peaks variations in coarse mode were as same as OC, while the other peaks were complicated; the peaks during winter, pre-monsoon, and monsoon seasons exhibited in droplet mode (1.1-2.1 mu m, 0.65-1.1 mu m, and 0.43-0.65 mu m, respectively), and in post-monsoon period, the peak located in condensation mode. The highest peak concentrations for OC and EC occurred in winter and the pre-monsoon period, while the lowest peak values in the monsoon and post-monsoon periods, respectively. The size distribution variations may be caused by deposition, gas/particles exchange, hygroscopic growth, external mixing, and secondary organic carbon formation. OC/EC ratios in aerosols over the TP mostly exhibit high values, which emphasizes the importance of OC over this region. (C) 2014 Elsevier B.V. All rights reserved.
关键词	Atmospheric aerosols Organic carbon Elemental carbon Size distribution Tibetan Plateau
学科领域	Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
来源期刊	ATMOSPHERIC RESEARCH
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/111776
作者单位	Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Wan, Xin,Kang, Shichang,Wang, Yuesi,et al. Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.)[J]. 中国科学院西北生态环境资源研究院,2015,153.
APA	Wan, Xin.,Kang, Shichang.,Wang, Yuesi.,Xin, Jinyuan.,Liu, Bin.,...&Cong, Zhiyuan.(2015).Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.).ATMOSPHERIC RESEARCH,153.
MLA	Wan, Xin,et al."Size distribution of carbonaceous aerosols at a high-altitude site on the central Tibetan Plateau (Nam Co Station, 4730 m a.s.l.)".ATMOSPHERIC RESEARCH 153(2015).