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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
发表日期	2018
ISSN	1001-0742
EISSN	1878-7320
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	Mercury speciation Snow/ice Migration Transport Mountain glacier Tibetan Plateau
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
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/111959
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Gansu, Peoples R China
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]. 中国科学院西北生态环境资源研究院,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-CHINA,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-CHINA 68(2018).