气候变化领域集成服务门户(CCPortal): Substantial accumulation of mercury in the deepest parts of the ocean and implications for the environmental mercury cycle

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DOI	10.1073/pnas.2102629118
	Substantial accumulation of mercury in the deepest parts of the ocean and implications for the environmental mercury cycle
	Liu M.; Xiao W.; Zhang Q.; Yuan S.; Raymond P.A.; Chen J.; Liu J.; Tao S.; Xu Y.; Wang X.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:51
英文摘要	Anthropogenic activities have led to widespread contamination with mercury (Hg), a potent neurotoxin that bioaccumulates through food webs. Recent models estimated that, presently, 200 to 600 t of Hg is sequestered annually in deep-sea sediments, approximately doubling since industrialization. However, most studies did not extend to the hadal zone (6,000- to 11,000-m depth), the deepest ocean realm. Here, we report on measurements of Hg and related parameters in sediment cores from four trench regions (1,560 to 10,840 m), showing that the world's deepest ocean realm is accumulating Hg at remarkably high rates (depth-integrated minimum-maximum: 24 to 220 μg · m-2· y-1) greater than the global deep-sea average by a factor of up to 400, with most Hg in these trenches being derived from the surface ocean. Furthermore, vertical profiles of Hg concentrations in trench cores show notable increasing trends from pre-1900 [average 51 ± 14 (1σ) ng · g-1] to post-1950 (81 ± 32 ng · g-1). This increase cannot be explained by changes in the delivery rate of organic carbon alone but also need increasing Hg delivery fromanthropogenic sources. This evidence, along with recent findings on the high abundance of methylmercury in hadal biota [R. Sun et al., Nat. Commun. 11, 3389 (2020); J. D. Blum et al., Proc. Natl. Acad. Sci. U. S. A. 117, 29292-29298 (2020)], leads us to propose that hadal trenches are a large marine sink for Hg and may play an important role in the regulation of the global biogeochemical cycle of Hg. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Atmospheric deposition; Biogeochemical cycle; Deepest-ocean realm; Stable isotope; Terrigenous input
语种	英语
scopus关键词	mercury; chemistry; ecosystem; sea; sediment; Ecosystem; Geologic Sediments; Mercury; Oceans and Seas
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250923
作者单位	Ministry of Education, Laboratory of Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China; School of the Environment, Yale University, New Haven, CT 06511, United States; Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, China; Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; Shenzhen Key Laboratory of Marine Archaea Geo-Omics, Shenzhen, 518055, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 523936, China; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States; Chemistry Department, Trent University, Peterborough, ON K9J7B8, Canada; Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, 300072, China
推荐引用方式 GB/T 7714	Liu M.,Xiao W.,Zhang Q.,et al. Substantial accumulation of mercury in the deepest parts of the ocean and implications for the environmental mercury cycle[J],2021,118(51).
APA	Liu M..,Xiao W..,Zhang Q..,Yuan S..,Raymond P.A..,...&Wang X..(2021).Substantial accumulation of mercury in the deepest parts of the ocean and implications for the environmental mercury cycle.Proceedings of the National Academy of Sciences of the United States of America,118(51).
MLA	Liu M.,et al."Substantial accumulation of mercury in the deepest parts of the ocean and implications for the environmental mercury cycle".Proceedings of the National Academy of Sciences of the United States of America 118.51(2021).