气候变化领域集成服务门户(CCPortal): Mercury isotopes identify near-surface marine mercury in deep-sea trench biota

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DOI	10.1073/pnas.2012773117
	Mercury isotopes identify near-surface marine mercury in deep-sea trench biota
	Blum J.D.; Drazen J.C.; Johnson M.W.; Popp B.N.; Motta L.C.; Jamieson A.J.
发表日期	2020
ISSN	0027-8424
起始页码	29292
结束页码	29298
卷号	117 期号:47
英文摘要	Mercury isotopic compositions of amphipods and snailfish from deep-sea trenches reveal information on the sources and transformations of mercury in the deep oceans. Evidence for methylmercury subjected to photochemical degradation in the photic zone is provided by odd-mass independent isotope values (Δ199Hg) in amphipods from the Kermadec Trench, which average 1.57% (±0.14, n = 12, SD), and amphipods from the Mariana Trench, which average 1.49%(±0.28, n = 13). These values are close to the average value of 1.48% (±0.34, n = 10) for methyl-mercury in fish that feed at ~500-m depth in the central Pacific Ocean. Evidence for variable contributions of mercury from rainfall is provided by even-mass independent isotope values (Δ200Hg) in amphipods that average 0.03% (±0.02, n = 12) for the Kermadec and 0.07% (±0.01, n = 13) for the Mariana Trench compared to the rainfall average of 0.13 (±0.05, n = 8) in the central Pacific. Mass-dependent isotope values (δ202Hg) are elevated in amphipods from the Kermadec Trench (0.91 ±0.22%, n = 12) compared to the Mariana Trench (0.26 ±0.23%, n = 13), suggesting a higher level of microbial demethylation of the methyl-mercury pool before incorporation into the base of the foodweb. Our study suggests that mercury in the marine foodweb at ~500 m, which is predominantly anthropogenic, is transported to deep-sea trenches primarily in carrion, and then incorporated into hadal (6,000-11,000-m) food webs. Anthropogenic Hg added to the surface ocean is, therefore, expected to be rapidly transported to the deepest reaches of the oceans. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Deep sea; Isotope; Mercury; Oceanography; Trench
语种	英语
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/160196
作者单位	Blum, J.D., Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States; Drazen, J.C., Department of Oceanography, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Johnson, M.W., Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States; Popp, B.N., Department of Earth Sciences, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Motta, L.C., Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States; Jamieson, A.J., School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
推荐引用方式 GB/T 7714	Blum J.D.,Drazen J.C.,Johnson M.W.,et al. Mercury isotopes identify near-surface marine mercury in deep-sea trench biota[J],2020,117(47).
APA	Blum J.D.,Drazen J.C.,Johnson M.W.,Popp B.N.,Motta L.C.,&Jamieson A.J..(2020).Mercury isotopes identify near-surface marine mercury in deep-sea trench biota.Proceedings of the National Academy of Sciences of the United States of America,117(47).
MLA	Blum J.D.,et al."Mercury isotopes identify near-surface marine mercury in deep-sea trench biota".Proceedings of the National Academy of Sciences of the United States of America 117.47(2020).