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DOI	10.1016/j.jes.2018.03.033
	Insights into mercury in glacier snow and its incorporation into meltwater runoff based on observations in the southern Tibetan Plateau
	Sun, Shiwei; Kang, Shichang; Guo, Junming; Zhang, Qianggong; Paudyal, Rukumesh; Sun, Xuejun; Qin, Dahe
通讯作者	Kang, SC (通讯作者)
发表日期	2018
ISSN	1001-0742
EISSN	1878-7320
起始页码	130
结束页码	142
卷号	68
英文摘要	The Tibetan Plateau (TP) is recognized as Water Tower of Asia. Yet our understanding of mechanisms influencing incorporation of mercury (Hg) into freshwater in mountain glaciers on the TP remains quite limited. Extensive sampling of environmental matrices (e.g., snow/ice) were conducted on the East Rongbuk glacier on Mt. Everest and Zhadang glacier on Mt. Nyainqentanglha for Hg speciation analysis. Speciated Hg behaved quite different during snowmelt: a preferential early release of DHg (dissolved Hg) was observed at the onset of snowmelt, whereas PHg (particulate-bound Hg) and THg (total Hg) become relatively enriched in snow and released later. Small fraction of Hg in snow was lost during a snowmelt day (18.9%-34.7%) with a large proportion (58.1%-87.3%) contributed by PHg decrease, indicating that the deposited Hg is most likely retained in glacier snow/ice. Furthermore, THg were positively correlated with PHg and crustal major ions (e.g., Ca2+, Mg2+) during snowmelt, indicating that Hg is mainly migrated with particulates. The main pathway of Hg loss during snowmelt was most probably associated with release of PHg with meltwater, which was greatly influenced by ablation intensity of snow/ice. This should be paid particular concern as Hg preserved in mountain glaciers will mostly enter aquatic ecosystem as climate warms, impacting on downstream ecosystems adversely. Obvious decrease of THg during the downstream transport from glacier was observed with a large proportion contributed by PHg decrease. The main removal mechanism of Hg was associated with sedimentation of PHg during the transport process. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
关键词	ICE CORE ATMOSPHERIC MERCURY SEASONAL-VARIATIONS MT. EVEREST ELEMENTAL COMPOSITION ARCTIC SNOWPACK NORTH SLOPE TRANSFORMATIONS NYAINQENTANGLHA ENVIRONMENT
英文关键词	Mercury speciation; Snow/ice; Migration; Transport; Mountain glacier; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000439687300013
来源期刊	JOURNAL OF ENVIRONMENTAL SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259159
推荐引用方式 GB/T 7714	Sun, Shiwei,Kang, Shichang,Guo, Junming,et al. Insights into mercury in glacier snow and its incorporation into meltwater runoff based on observations in the southern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,68.
APA	Sun, Shiwei.,Kang, Shichang.,Guo, Junming.,Zhang, Qianggong.,Paudyal, Rukumesh.,...&Qin, Dahe.(2018).Insights into mercury in glacier snow and its incorporation into meltwater runoff based on observations in the southern Tibetan Plateau.JOURNAL OF ENVIRONMENTAL SCIENCES,68.
MLA	Sun, Shiwei,et al."Insights into mercury in glacier snow and its incorporation into meltwater runoff based on observations in the southern Tibetan Plateau".JOURNAL OF ENVIRONMENTAL SCIENCES 68(2018).