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    Insights and issues with simulating terrestrial DOC loading of Arctic river networks

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    11-1050.1.pdf (2.005Mb)
    Date
    2013-12
    Author
    Kicklighter, David W.  Concept link
    Hayes, Daniel J.  Concept link
    McClelland, James W.  Concept link
    Peterson, Bruce J.  Concept link
    McGuire, A. David  Concept link
    Melillo, Jerry M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6466
    As published
    https://doi.org/10.1890/11-1050.1
    Related Material/Data
    http://www.esapubs.org/archive/appl/A023/089/
    DOI
    10.1890/11-1050.1
    Keyword
     Climate change; Permafrost degradation; River discharge; Riverine DOC export; Terrestrial DOC loading; Trajectory of the Arctic; Water yield; Wildfire 
    Abstract
    Terrestrial carbon dynamics influence the contribution of dissolved organic carbon (DOC) to river networks in addition to hydrology. In this study, we use a biogeochemical process model to simulate the lateral transfer of DOC from land to the Arctic Ocean via riverine transport. We estimate that, over the 20th century, the pan-Arctic watershed has contributed, on average, 32 Tg C/yr of DOC to river networks emptying into the Arctic Ocean with most of the DOC coming from the extensive area of boreal deciduous needle-leaved forests and forested wetlands in Eurasian watersheds. We also estimate that the rate of terrestrial DOC loading has been increasing by 0.037 Tg C/yr2 over the 20th century primarily as a result of climate-induced increases in water yield. These increases have been offset by decreases in terrestrial DOC loading caused by wildfires. Other environmental factors (CO2 fertilization, ozone pollution, atmospheric nitrogen deposition, timber harvest, agriculture) are estimated to have relatively small effects on terrestrial DOC loading to Arctic rivers. The effects of the various environmental factors on terrestrial carbon dynamics have both offset and enhanced concurrent effects on hydrology to influence terrestrial DOC loading and may be changing the relative importance of terrestrial carbon dynamics on this carbon flux. Improvements in simulating terrestrial DOC loading to pan-Arctic rivers in the future will require better information on the production and consumption of DOC within the soil profile, the transfer of DOC from land to headwater streams, the spatial distribution of precipitation and its temporal trends, carbon dynamics of larch-dominated ecosystems in eastern Siberia, and the role of industrial organic effluents on carbon budgets of rivers in western Russia.
    Description
    Author Posting. © Ecological Society of America, 2013. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 23 (2013): 1817-1836, doi:10.1890/11-1050.1.
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    • Ecosystems Center
    Suggested Citation
    Ecological Applications 23 (2013): 1817-1836
     

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