globalchange  > 气候变化事实与影响
DOI: 10.1002/2015GB005307
Scopus记录号: 2-s2.0-84978420784
论文题名:
Different sources and degradation state of dissolved, particulate, and sedimentary organic matter along the Eurasian Arctic coastal margin
作者: Karlsson E; , Gelting J; , Tesi T; , van Dongen B; , Andersson A; , Semiletov I; , Charkin A; , Dudarev O; , Gustafsson Ö
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2016
卷: 30, 期:6
起始页码: 898
结束页码: 919
语种: 英语
英文关键词: biomarkers ; carbon isotopes ; coastal Arctic ; degradation state ; organic matter ; source apportionment
Scopus关键词: biomarker ; carbon cycle ; carbon isotope ; climate change ; degradation ; dissolved organic matter ; isotopic composition ; marine environment ; organic carbon ; particulate organic matter ; permafrost ; plankton ; seafloor ; surface water ; topsoil ; Arctic ; Arctic Ocean ; Eurasia ; Siberian Shelf
英文摘要: Thawing Arctic permafrost causes massive fluvial and erosional releases of dissolved and particulate organic carbon (DOC and POC) to coastal waters. Here we investigate how different sources and degradation of remobilized terrestrial carbon may affect large-scale carbon cycling, by comparing molecular and dual-isotope composition of waterborne high molecular weight DOC (>1 kD, aka colloidal OC), POC, and sedimentary OC (SOC) across the East Siberian Arctic Shelves. Lignin phenol fingerprints demonstrate a longitudinal trend in relative contribution of terrestrial sources to coastal OC. Wax lipids and cutins were not detected in colloidal organic carbon (COC), in contrast to POC and SOC, suggesting that different terrestrial carbon pools partition into different aquatic carrier phases. The Δ14C signal suggests overwhelmingly contemporary sources for COC, while POC and SOC are dominated by old C from Ice Complex Deposit (ICD) permafrost. Monte Carlo source apportionment (δ13C, Δ14C) constrained that COC was dominated by terrestrial OC from topsoil permafrost (65%) and marine plankton (25%) with smaller contribution ICD and other older permafrost stocks (9%). This distribution is likely a result of inherent compositional matrix differences, possibly driven by organomineral associations. Modern OC found suspended in the surface water may be more exposed to degradation, in contrast to older OC that preferentially settles to the seafloor where it may be degraded on a longer timescale. The different sources which partition into DOC, POC, and SOC appear to have vastly different fates along the Eurasian Arctic coastal margin and may possibly respond on different timescales to climate change. ©2016. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77842
Appears in Collections:气候变化事实与影响

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作者单位: Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Institute of Marine Sciences, ISMAR-CNR, Bologna, Italy; School of Earth, Atmospheric and Environmental Sciences and Williamson Research Centre for Molecular Environmental Science, University of Manchester, Manchester, United Kingdom; Pacific Oceanological Institute, Russian Academy of Sciences, Vladivostok, Russian Federation; International Arctic Research Center, University Alaska Fairbanks, Fairbanks, AK, United States; National Research Tomsk Polytechnic University, Tomsk, Russian Federation

Recommended Citation:
Karlsson E,, Gelting J,, Tesi T,et al. Different sources and degradation state of dissolved, particulate, and sedimentary organic matter along the Eurasian Arctic coastal margin[J]. Global Biogeochemical Cycles,2016-01-01,30(6)
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