气候变化领域集成服务门户(CCPortal): Spatial distribution and magnification processes of mercury in snow from high-elevation glaciers in the Tibetan Plateau

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DOI	10.1016/j.atmosenv.2011.10.008
	Spatial distribution and magnification processes of mercury in snow from high-elevation glaciers in the Tibetan Plateau
	Huang, Jie; Kang, Shichang; Zhang, Qianggong; Jenkins, Matt G.; Guo, Junming; Zhang, Guoshuai; Wang, Kang
发表日期	2012
ISSN	1352-2310
卷号	46
英文摘要	The Tibetan Plateau is one of the most extreme cold regions in the world and a source of fresh water to 1.4 billion people. In this study, between 2008 and 2010, surface snow samples were retrieved in replicate from four high-elevation glaciers with an average elevation of 5200 m above sea level from the Tibetan Plateau and were analyzed for total Hg (Hg(T)). The spatial distribution of Hg for glaciers and magnification processes of Hg in snow with increasing altitude over the Tibetan Plateau are investigated. The total Hg concentrations in snow samples ranged from <1 to 15 ng L(-1), with the highest concentrations at Mt. Muztagata (8.56 ng L(-1)), and the lowest concentrations at Mt. Nyainqentanglha (0.90 ng L(-1)). This may be explained by the high concentration and annual flux of particulate matter deposition at Mt. Muztagata, the maximum from which particulate matter loads decrease from northwest to southeast over the Tibetan Plateau. Because Hg deposited on the plateau is primarily associated with particulate matter, only 31% of Hg was lost (e.g., reemitted back to the atmosphere) during the transition of fresh snow to coarse-grained snow. This demonstrates that Hg in snow over the Tibetan Plateau may be less influenced by the effect of post-depositional processes such as reemission and photoreduction than that in the Arctic. Moreover, the increases of HgT with increasing altitude ("altitude effect") found on four high-elevation glaciers (e.g., 3-fold in Mt. Muztagata) suggests that atmospheric Hg is cold-trapped and magnified toward low temperature and/or high-elevation regions, implying that the glaciers over the Tibetan Plateau play an important sink role for global Hg cycling. In the context of a warming climate, the Tibetan Plateau may shift from a current sink to a source in the future, and the released Hg may endanger the ecosystems and human health of these snow-fed regions. (C) 2011 Elsevier Ltd. All rights reserved.
关键词	Mercury Snow Cold-trapping Glaciers Tibetan Plateau
学科领域	Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences ; Meteorology & Atmospheric Sciences
来源期刊	ATMOSPHERIC ENVIRONMENT
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/111659
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	Huang, Jie,Kang, Shichang,Zhang, Qianggong,et al. Spatial distribution and magnification processes of mercury in snow from high-elevation glaciers in the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2012,46.
APA	Huang, Jie.,Kang, Shichang.,Zhang, Qianggong.,Jenkins, Matt G..,Guo, Junming.,...&Wang, Kang.(2012).Spatial distribution and magnification processes of mercury in snow from high-elevation glaciers in the Tibetan Plateau.ATMOSPHERIC ENVIRONMENT,46.
MLA	Huang, Jie,et al."Spatial distribution and magnification processes of mercury in snow from high-elevation glaciers in the Tibetan Plateau".ATMOSPHERIC ENVIRONMENT 46(2012).