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    Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins

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    Author's manuscript, includes supplemental material (992.8Kb)
    Date
    2013-07
    Author
    Feng, Xiaojuan  Concept link
    Vonk, Jorien E.  Concept link
    van Dongen, Bart E.  Concept link
    Gustafsson, Orjan  Concept link
    Semiletov, Igor P.  Concept link
    Dudarev, Oleg V.  Concept link
    Wang, Zhiheng  Concept link
    Montlucon, Daniel B.  Concept link
    Wacker, Lukas  Concept link
    Eglinton, Timothy I.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6180
    As published
    https://doi.org/10.1073/pnas.1307031110
    Keyword
     Fluvial mobilization; Compound-specific 14C; Hydrogeographic control 
    Abstract
    Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect is challenging to assess due to the diverse processes controlling the release of various organic carbon (OC) pools from heterogeneous Arctic landscapes. Here, by radiocarbon dating various terrestrial OC components in fluvially- and coastally-integrated estuarine sediments, we present a unique framework for deconvoluting the contrasting mobilization mechanisms of surface versus deep (permafrost) carbon pools across the climosequence of the Eurasian Arctic. Vascular-plant-derived lignin phenol 14C contents reveal significant inputs of young carbon from surface sources whose delivery is dominantly controlled by river runoff. In contrast, plant wax lipids predominantly trace ancient (permafrost) OC that is preferentially mobilized from discontinuous permafrost regions where hydrological conduits penetrate deeper into soils and thermokarst erosion occurs more frequently. As river runoff has significantly increased across the Eurasian Arctic in recent decades, we estimate from an isotopic mixing model that, in tandem with an increased transfer of young surface carbon, the proportion of mobilized terrestrial OC accounted for by ancient carbon has increased by 3-6% between 1985-2004. These findings suggest that, while partly masked by surface-carbon export, climate-change-induced mobilization of old permafrost carbon is well under way in the Arctic.
    Description
    Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 110 (2013): 14168–14173, doi:10.1073/pnas.1307031110.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Feng, Xiaojuan, Vonk, Jorien E., van Dongen, Bart E., Gustafsson, Orjan, Semiletov, Igor P., Dudarev, Oleg V., Wang, Zhiheng, Montlucon, Daniel B., Wacker, Lukas, Eglinton, Timothy I., "Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins", 2013-07, https://doi.org/10.1073/pnas.1307031110, https://hdl.handle.net/1912/6180
     

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