Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2019672118 |
Source apportionment of methane escaping the subsea permafrost system in the outer Eurasian Arctic Shelf | |
Julia Steinbach; Henry Holmstrand; Kseniia Shcherbakova; Denis Kosmach; Volker Brüchert; Natalia Shakhova; Anatoly Salyuk; Célia J. Sapart; Denis Chernykh; Riko Noormets; Igor Semiletov; Örjan Gustafsson | |
2021-03-09 | |
发表期刊 | Proceedings of the National Academy of Science
![]() |
出版年 | 2021 |
英文摘要 | The East Siberian Arctic Shelf holds large amounts of inundated carbon and methane (CH4). Holocene warming by overlying seawater, recently fortified by anthropogenic warming, has caused thawing of the underlying subsea permafrost. Despite extensive observations of elevated seawater CH4 in the past decades, relative contributions from different subsea compartments such as early diagenesis, subsea permafrost, methane hydrates, and underlying thermogenic/ free gas to these methane releases remain elusive. Dissolved methane concentrations observed in the Laptev Sea ranged from 3 to 1,500 nM (median 151 nM; oversaturation by ∼3,800%). Methane stable isotopic composition showed strong vertical and horizontal gradients with source signatures for two seepage areas of δ13C-CH4 = (−42.6 ± 0.5)/(−55.0 ± 0.5) ‰ and δD-CH4 = (−136.8 ± 8.0)/(−158.1 ± 5.5) ‰, suggesting a thermogenic/natural gas source. Increasingly enriched δ13C-CH4 and δD-CH4 at distance from the seeps indicated methane oxidation. The Δ14C-CH4 signal was strongly depleted (i.e., old) near the seeps (−993 ± 19/−1050 ± 89‰). Hence, all three isotope systems are consistent with methane release from an old, deep, and likely thermogenic pool to the outer Laptev Sea. This knowledge of what subsea sources are contributing to the observed methane release is a prerequisite to predictions on how these emissions will increase over coming decades and centuries. |
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/316944 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Julia Steinbach,Henry Holmstrand,Kseniia Shcherbakova,et al. Source apportionment of methane escaping the subsea permafrost system in the outer Eurasian Arctic Shelf[J]. Proceedings of the National Academy of Science,2021. |
APA | Julia Steinbach.,Henry Holmstrand.,Kseniia Shcherbakova.,Denis Kosmach.,Volker Brüchert.,...&Örjan Gustafsson.(2021).Source apportionment of methane escaping the subsea permafrost system in the outer Eurasian Arctic Shelf.Proceedings of the National Academy of Science. |
MLA | Julia Steinbach,et al."Source apportionment of methane escaping the subsea permafrost system in the outer Eurasian Arctic Shelf".Proceedings of the National Academy of Science (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论