气候变化领域集成服务门户(CCPortal): Mercury variation and export in trans-Himalayan rivers: Insights from field observations in the Koshi River

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DOI	10.1016/j.scitotenv.2020.139836
	Mercury variation and export in trans-Himalayan rivers: Insights from field observations in the Koshi River
	Sun, Xuejun; Zhang, Qianggong; Li, Mingyue; Kandel, Kshitiz; Rawat, Bakhat; Pandey, Aastha; Guo, Junming; Kang, Shichang; Pant, Ramesh Raj; Cong, Zhiyuan; Zhang, Fan
通讯作者	Zhang, QG (通讯作者)
发表日期	2020
ISSN	0048-9697
EISSN	1879-1026
卷号	738
英文摘要	Strengthening the research of riverine mercury (Hg) export is of great significance for understanding the regional and global Hg cycle, especially for the data lacking trans-Himalayan rivers. In this study, three systematic sampling campaigns were conducted in the Koshi River Basin (KRB) during the post-monsoon, pre-monsoon and monsoon seasons. Hg speciation and distribution of river water were analyzed among the different seasons for a total of 88 water samples. The total Hg (THg) concentration of surface water in the KRB ranged from 0.64 to 32.96 ng.L-1 with an average of 5.83 +/- 6.19 ng.L-1 and decreased in the order of post-monsoon (8.79 +/- 7.32 ng.L-1) > monsoon (6.68 +/- 6.12 ng.L-1) > pre-monsoon (2.18 +/- 1.29 ng.L-1). Particulate Hg (PHg) accounted for 63% of THg on average and had a positive correlation with THg among all the three sampling seasons, indicating that the differences in PHg concentration were likely one of the main factors leading to the seasonal and spatial variations in THg in the KRB surface water. The annual Hg exports and fluxes were estimated to be 339.04 kg and 3.88 mu g.m(-2).yr(-1), respectively. Furthermore, Hg export from the KRB had significant seasonal variation and decreased in the order of monsoon (259.47 kg) > post-monsoon (61.18 kg) > winter (9.31 kg) > pre-monsoon (9.08 kg), and this pattern was mainly related to seasonal changes in river runoff. The annual Hg export is projected to increase in the future, especially in the post-monsoon season. Therefore, more attention should be paid to river runoff observations and riverine Hg research for water resources management in the Himalaya. (C) 2020 Elsevier B.V. All rights reserved.
关键词	SPATIAL-DISTRIBUTION SUSPENDED SEDIMENTS SEASONAL-VARIATIONS CLIMATE-CHANGE ARCTIC-OCEAN BASIN WATER SPECIATION GLACIERS IMPACT
英文关键词	Mercury; Speciation; Distribution; Export; Koshi River; Trans-Himalaya
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000559087400001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/259847
推荐引用方式 GB/T 7714	Sun, Xuejun,Zhang, Qianggong,Li, Mingyue,et al. Mercury variation and export in trans-Himalayan rivers: Insights from field observations in the Koshi River[J]. 中国科学院青藏高原研究所,2020,738.
APA	Sun, Xuejun.,Zhang, Qianggong.,Li, Mingyue.,Kandel, Kshitiz.,Rawat, Bakhat.,...&Zhang, Fan.(2020).Mercury variation and export in trans-Himalayan rivers: Insights from field observations in the Koshi River.SCIENCE OF THE TOTAL ENVIRONMENT,738.
MLA	Sun, Xuejun,et al."Mercury variation and export in trans-Himalayan rivers: Insights from field observations in the Koshi River".SCIENCE OF THE TOTAL ENVIRONMENT 738(2020).