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Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam
Liu, MD (Liu, Maodian)1; Xie, H (Xie, Han)1; He, YP (He, Yipeng)2; Zhang, QR (Zhang, Qianru)1; Sun, XJ (Sun, Xuejun)3; Yu, CH (Yu, Chenghao)1; Chen, L (Chen, Long)4; Zhang, W (Zhang, Wei)5; Zhang, QG (Zhang, Qianggong)3; Wang, XJ (Wang, Xuejun)1
Source PublicationWATER RESEARCH
2019
Volume166Issue:0Pages:115042
DOI10.1016/j.watres.2019.115042
Abstract

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.

Subject AreaEnvironmental Sciences
WOS IDWOS:000493221600019
Language英语
Indexed BySCI
KeywordMethyl-mercury Spatial-patterns Organic-carbon China Water Downstream Reservoir Fresh Export Fish
WOS Research AreaEngineering ; Environmental Sciences & Ecology ; Water Resources
WOS SubjectEngineering, Environmental ; Environmental Sciences ; Water Resources
Cooperation Status国际
ISSN0043-1354
Department环境变化与地表过程重点实验室
URL查看原文
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9078
Collection图书馆
Corresponding AuthorWang, XJ (Wang, Xuejun)
Affiliation1.Peking Univ, Coll Urban & Environm Sci, Minist Educ, Lab Earth Surface Proc, Beijing 100871, Peoples R China;
2.Univ Connecticut, Dept Marine Sci, 1080 Shennecossett Rd, Groton, CT 06340 USA;
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100101, Peoples R China;
4.East China Normal Univ, Minist Educ, Key Lab Geog Informat Sci, Shanghai 200241, Peoples R China;
5.Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China.
Recommended Citation
GB/T 7714
Liu, MD ,Xie, H ,He, YP ,et al. Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam[J]. WATER RESEARCH,2019,166(0):115042.
APA Liu, MD .,Xie, H .,He, YP .,Zhang, QR .,Sun, XJ .,...&Wang, XJ .(2019).Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam.WATER RESEARCH,166(0),115042.
MLA Liu, MD ,et al."Sources and transport of methylmercury in the Yangtze River and the impact of the Three Gorges Dam".WATER RESEARCH 166.0(2019):115042.
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