气候变化领域集成服务门户(CCPortal): Carbonaceous material export from Siberian permafrost tracked across the Arctic Shelf using Raman spectroscopy

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DOI	10.5194/tc-12-3293-2018
	Carbonaceous material export from Siberian permafrost tracked across the Arctic Shelf using Raman spectroscopy
	Sparkes R.B.; Maher M.; Blewett J.; Selver A.O.; Gustafsson O.; Semiletov I.P.; Van Dongen B.E.
发表日期	2018
ISSN	19940416
卷号	12 期号:10
英文摘要	Warming-induced erosion of permafrost from Eastern Siberia mobilises large amounts of organic carbon and delivers it to the East Siberian Arctic Shelf (ESAS). In this study Raman spectroscopy of carbonaceous material (CM) was used to characterise, identify and track the most recalcitrant fraction of the organic load: 1463 spectra were obtained from surface sediments collected across the ESAS and automatically analysed for their Raman peaks. Spectra were classified by their peak areas and widths into disordered, intermediate, mildly graphitised and highly graphitised groups and the distribution of these classes was investigated across the shelf. Disordered CM was most prevalent in a permafrost core from Kurungnakh Island and from areas known to have high rates of coastal erosion. Sediments from outflows of the Indigirka and Kolyma rivers were generally enriched in intermediate CM. These different sediment sources were identified and distinguished along an E-W transect using their Raman spectra, showing that sediment is not homogenised on the ESAS. Distal samples, from the ESAS slope, contained greater amounts of highly graphitised CM compared to the rest of the shelf, attributable to degradation or, more likely, winnowing processes offshore. The presence of all four spectral classes in distal sediments demonstrates that CM degrades much more slowly than lipid biomarkers and other traditional tracers of terrestrial organic matter and shows that alongside degradation of the more labile organic matter component there is also conservative transport of carbon across the shelf toward the deep ocean. Thus, carbon cycle calculations must consider the nature as well as the amount of carbon liberated from thawing permafrost and other erosional settings. © Author(s) 2018.
语种	英语
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/119050
作者单位	School of Science and the Environment, Manchester Metropolitan University, Manchester, United Kingdom; School of Earth and Environmental Sciences and Williamson, Research Centre for Molecular Environmental Science, University of Manchester, 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 of the 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; Organic Geochemistry Unit, School of Chemistry, Cabot Institute, University of Bristol, Bristol, United Kingdom
推荐引用方式 GB/T 7714	Sparkes R.B.,Maher M.,Blewett J.,et al. Carbonaceous material export from Siberian permafrost tracked across the Arctic Shelf using Raman spectroscopy[J],2018,12(10).
APA	Sparkes R.B..,Maher M..,Blewett J..,Selver A.O..,Gustafsson O..,...&Van Dongen B.E..(2018).Carbonaceous material export from Siberian permafrost tracked across the Arctic Shelf using Raman spectroscopy.Cryosphere,12(10).
MLA	Sparkes R.B.,et al."Carbonaceous material export from Siberian permafrost tracked across the Arctic Shelf using Raman spectroscopy".Cryosphere 12.10(2018).