气候变化领域集成服务门户(CCPortal): Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes

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DOI	10.1038/srep23332
	Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes
	Yin, Runsheng; Feng, Xinbin; Hurley, James P.; Krabbenhoft, David P.; Lepak, Ryan F.; Kang, Shichang; Yang, Handong; Li, Xiangdong
发表日期	2016
ISSN	2045-2322
卷号	6
英文摘要	The Tibetan Plateau (TP), known as the "Third Pole", is a critical zone for atmospheric mercury (Hg) deposition. Increasing anthropogenic activities in the globe leads to environmental changes, which may affect the loading, transport and deposition of Hg in the environment. However, the deposition history and geochemical cycling of Hg in the TP is still uncertain. Our records of Hg and Hg isotopes in sediment profiles of the two largest lakes in the TP, Lake Qinghai and Nam Co, show increased Hg influx since last century, with the maximum Hg influx enrichment ratios of 5.4 and 3.5 in Lake Qinghai and Nam Co, respectively. Shifts in negative delta Hg-202 in Lake Qinghai (-4.55 to -3.15%) and Nam Co (-5.04 to -2.16%) indicate increased atmospheric Hg deposition through rainfall, vegetation and runoff of soils. Mass independent fractionation of both even-Hg (Delta Hg-200: +0.05 to +0.10%) and odd-Hg (Delta Hg-199: +0.12 to +0.31%) isotopes were observed. Positive Delta Hg-200 suggest high proportion of precipitation-derived Hg in the TP, whereas the positive Delta Hg-199 results from Hg(II) photo-reduction. Both lakes show increasing Delta Hg-199 since the 1900 s, and we conclude that with the decrease of ice duration, Hg(II) photoreduction may have been accelerated in these TP lakes.
学科领域	Science & Technology - Other Topics
语种	英语
WOS研究方向	Multidisciplinary Sciences
来源期刊	SCIENTIFIC REPORTS
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/111850
作者单位	Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China
推荐引用方式 GB/T 7714	Yin, Runsheng,Feng, Xinbin,Hurley, James P.,et al. Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes[J]. 中国科学院西北生态环境资源研究院,2016,6.
APA	Yin, Runsheng.,Feng, Xinbin.,Hurley, James P..,Krabbenhoft, David P..,Lepak, Ryan F..,...&Li, Xiangdong.(2016).Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes.SCIENTIFIC REPORTS,6.
MLA	Yin, Runsheng,et al."Historical Records of Mercury Stable Isotopes in Sediments of Tibetan Lakes".SCIENTIFIC REPORTS 6(2016).