气候变化领域集成服务门户(CCPortal): Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam

CCPortal

DOI	10.1016/j.watres.2019.115042
	Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam
	Liu, Maodian; Xie, Han; He, Yipeng; Zhang, Qianru; Sun, Xuejun; Yu, Chenghao; Chen, Long; Zhang, Wei; Zhang, Qianggong; Wang, Xuejun
通讯作者	Wang, XJ (通讯作者)
发表日期	2019
ISSN	0043-1354
卷号	166
英文摘要	The magnitude of environmental change due to anthropogenic impacts might greatly exceed that of natural disturbances. In this work, we quantitatively examine the impacts of river damming, soil erosion, and point-source release on the transport of methylmercury (MeHg) throughout the Yangtze River, the third longest river in the world. Based on seasonal observations and the subsequent material flow analysis, we found that in 2016, the Yangtze River discharged 470 +/- 200 kg MeHg to the coastal and shelf areas, a value at least ten-fold larger than existing observations in other large rivers around the world. The construction of the Three Gorges Dam (TGD), the world's largest hydropower dam, induced a substantial amount of MeHg (at least 250 +/- 220 kg) accumulation in the reservoir and a relatively small amount of MeHg (150 +/- 37 kg) discharge to the downstream region in 2016. The reservoir itself is not expected to be more contaminated by MeHg than the downstream areas of the river after the TGD, and the TGD has an additive effect on downstream MeHg transport. The riverine MeHg flux in the river mouth was 3-fold that discharged from the TGD mainly due to TGD-induced resuspension of MeHg from the downstream riverbed, as well as MeHg imports to the downstream area from tributaries, soil erosion, municipal wastewater, and in situ production. Our analysis offers new evidence that in future decades, the increase in estuarine MeHg contamination resulting from the increasing construction of large dams might pose a challenge for global coastal fisheries. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	METHYL-MERCURY SPATIAL-PATTERNS ORGANIC-CARBON CHINA WATER DOWNSTREAM RESERVOIR FRESH EXPORT FISH
英文关键词	Methylmercury; River continuum; Coastal ocean; River damming; Soil erosion; Point-source release
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:000493221600019
来源期刊	WATER RESEARCH
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/259593
推荐引用方式 GB/T 7714	Liu, Maodian,Xie, Han,He, Yipeng,et al. Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam[J]. 中国科学院青藏高原研究所,2019,166.
APA	Liu, Maodian.,Xie, Han.,He, Yipeng.,Zhang, Qianru.,Sun, Xuejun.,...&Wang, Xuejun.(2019).Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam.WATER RESEARCH,166.
MLA	Liu, Maodian,et al."Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam".WATER RESEARCH 166(2019).