气候变化领域集成服务门户(CCPortal): Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf

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DOI	10.5194/tc-10-2485-2016
	Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf
	Sparkes R.B.; Selver A.D.; Gustafsson Ö.; Semiletov I.P.; Haghipour N.; Wacker L.; Eglinton T.I.; Talbot H.M.; Van Dongen B.E.
发表日期	2016
ISSN	19940416
卷号	10 期号:5
英文摘要	Mobilisation of terrestrial organic carbon (terrOC) from permafrost environments in eastern Siberia has the potential to deliver significant amounts of carbon to the Arctic Ocean, via both fluvial and coastal erosion. Eroded terrOC can be degraded during offshore transport or deposited across the wide East Siberian Arctic Shelf (ESAS). Most studies of terrOC on the ESAS have concentrated on solvent-extractable organic matter, but this represents only a small proportion of the total terrOC load. In this study we have used pyrolysis-gas chromatography-mass spectrometry (py-GCMS) to study all major groups of macromolecular components of the terrOC; this is the first time that this technique has been applied to the ESAS. This has shown that there is a strong offshore trend from terrestrial phenols, aromatics and cyclopentenones to marine pyridines. There is good agreement between proportion phenols measured using py-GCMS and independent quantification of lignin phenol concentrations (r2 Combining double low line 0.67, p < 0.01, n Combining double low line 24). Furfurals, thought to represent carbohydrates, show no offshore trend and are likely found in both marine and terrestrial organic matter. We have also collected new radiocarbon data for bulk OC (14COC) which, when coupled with previous measurements, allows us to produce the most comprehensive 14COC map of the ESAS to date. Combining the 14COC and py-GCMS data suggests that the aromatics group of compounds is likely sourced from old, aged terrOC, in contrast to the phenols group, which is likely sourced from modern woody material. We propose that an index of the relative proportions of phenols and pyridines can be used as a novel terrestrial vs. marine proxy measurement for macromolecular organic matter. Principal component analysis found that various terrestrial vs. marine proxies show different patterns across the ESAS, and it shows that multiple river-ocean transects of surface sediments transition from river-dominated to coastal-erosion-dominated to marine-dominated signatures.
学科领域	aromatic hydrocarbon; biochemical composition; bulk density; coastal erosion; concentration (composition); fluvial deposit; marine environment; molecular analysis; organic matter; radiocarbon dating; sediment analysis; sediment trap; terrestrial deposit; Arctic Ocean; East Siberian Sea; Siberian Shelf
语种	英语
scopus关键词	aromatic hydrocarbon; biochemical composition; bulk density; coastal erosion; concentration (composition); fluvial deposit; marine environment; molecular analysis; organic matter; radiocarbon dating; sediment analysis; sediment trap; terrestrial deposit; Arctic Ocean; East Siberian Sea; Siberian Shelf
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119563
作者单位	School of Earth and Environmental Sciences, Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, United Kingdom; School of Science and the Environment, Manchester Metropolitan University, Manchester, United Kingdom; Ballkesir University, Geological Engineering Department, Ballkesir, Turkey; Department of Environmental Science and Analytical Chemistry (ACES), Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russian Federation; International Arctic Research Center, University of Alaska, Fairbanks, United States; National Tomsk Research Polytechnic University, Tomsk, Russian Federation; Geological Institute, ETH Zurich, Zurich, Switzerland; Laboratory of Ion Beam Physics, ETH Zurich, Zurich, Switzerland; School of Civil Engineering and Geosciences, Newcastle University, Newcastle, United Kingdom
推荐引用方式 GB/T 7714	Sparkes R.B.,Selver A.D.,Gustafsson Ö.,et al. Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf[J],2016,10(5).
APA	Sparkes R.B..,Selver A.D..,Gustafsson Ö..,Semiletov I.P..,Haghipour N..,...&Van Dongen B.E..(2016).Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf.Cryosphere,10(5).
MLA	Sparkes R.B.,et al."Macromolecular composition of terrestrial and marine organic matter in sediments across the East Siberian Arctic Shelf".Cryosphere 10.5(2016).