Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41561-018-0291-5 |
Persistent organic matter in oxic subseafloor sediment | |
Estes, Emily R.1; 39;Hondt, Steven2 | |
2019-02-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2019 |
卷号 | 12期号:2页码:126-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Japan |
英文摘要 | Nearly half of the global seafloor is overlain by sediment oxygenated to the basement. Yet, despite the availability of oxygen to fuel aerobic respiration, organic carbon persists over million-year timescales. Identifying the controls on organic carbon preservation requires an improved understanding of the composition and distribution of organic carbon within deep oligotro-phic marine sediments. Here we show that organic carbon in sediment from the oligotrophic North Atlantic and South Pacific is low (<0.1%), yet stable to depths of 25 m and ages of 24 million years. This organic carbon is not bound in biomass and has a low carbon/nitrogen ratio. X-ray imaging and spectroscopic analyses reveal that the chemical composition of this old, deep organic carbon is dominated (40-60%) by amide and carboxylic carbon with a proteinaceous nature. We posit that organic carbon persists in oxic oligotrophic sediment through a combination of protective processes that involve adsorption to mineral surfaces and physical inaccessibility to the heterotrophic community. We estimate that up to 1.6 x 10(22) g of organic carbon are sequestered on million-year timescales in oxic pelagic sediment, which exceeds current estimates of the total global sediment organic carbon and constitutes an important, previously overlooked carbon reservoir. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457194900012 |
WOS关键词 | STATE C-13 NMR ; MARINE-SEDIMENTS ; MINERAL INTERACTIONS ; MANGANESE OXIDES ; PORE-WATER ; PRESERVATION ; CARBON ; OXYGEN ; OXIDATION ; DEGRADATION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/34877 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, MIT WHOI Joint Program Oceanog Appl Ocean Sci & E, Woods Hole, MA 02543 USA; 2.Univ Rhode Isl, Grad Sch Oceanog, Narragansett, RI 02882 USA; 3.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Kochi Inst Core Sample Res, 200 Monobe Otsu, Nankoku, Kochi, Japan; 4.Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA; 5.Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA USA; 6.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA; 7.Univ Delaware, Coll Earth Ocean & Environm, Lewes, DE 19958 USA |
推荐引用方式 GB/T 7714 | Estes, Emily R.,39;Hondt, Steven. Persistent organic matter in oxic subseafloor sediment[J]. NATURE GEOSCIENCE,2019,12(2):126-+. |
APA | Estes, Emily R.,&39;Hondt, Steven.(2019).Persistent organic matter in oxic subseafloor sediment.NATURE GEOSCIENCE,12(2),126-+. |
MLA | Estes, Emily R.,et al."Persistent organic matter in oxic subseafloor sediment".NATURE GEOSCIENCE 12.2(2019):126-+. |
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