Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2012773117 |
Mercury isotopes identify near-surface marine mercury in deep-sea trench biota | |
Joel D. Blum; Jeffrey C. Drazen; Marcus W. Johnson; Brian N. Popp; Laura C. Motta; Alan J. Jamieson | |
2020-11-20 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2020 |
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 methyl-mercury 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. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/304329 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Joel D. Blum,Jeffrey C. Drazen,Marcus W. Johnson,et al. Mercury isotopes identify near-surface marine mercury in deep-sea trench biota[J]. Proceedings of the National Academy of Science,2020. |
APA | Joel D. Blum,Jeffrey C. Drazen,Marcus W. Johnson,Brian N. Popp,Laura C. Motta,&Alan J. Jamieson.(2020).Mercury isotopes identify near-surface marine mercury in deep-sea trench biota.Proceedings of the National Academy of Science. |
MLA | Joel D. Blum,et al."Mercury isotopes identify near-surface marine mercury in deep-sea trench biota".Proceedings of the National Academy of Science (2020). |
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