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    A land-to-ocean perspective on the magnitude, source and implication of DIC flux from major Arctic rivers to the Arctic Ocean

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    Date
    2012-12-14
    Author
    Tank, Suzanne E.  Concept link
    Raymond, Peter A.  Concept link
    Striegl, Robert G.  Concept link
    McClelland, James W.  Concept link
    Holmes, Robert M.  Concept link
    Fiske, Gregory J.  Concept link
    Peterson, Bruce J.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5718
    As published
    https://doi.org/10.1029/2011GB004192
    DOI
    10.1029/2011GB004192
    Keyword
     Arctic; Dissolved inorganic carbon; Ocean acidification; Permafrost; River biogeochemistry; Weathering 
    Abstract
    A series of seasonally distributed measurements from the six largest Arctic rivers (the Ob', Yenisey, Lena, Kolyma, Yukon and Mackenzie) was used to examine the magnitude and significance of Arctic riverine DIC flux to larger scale C dynamics within the Arctic system. DIC concentration showed considerable, and synchronous, seasonal variation across these six large Arctic rivers, which have an estimated combined annual DIC flux of 30 Tg C yr−1. By examining the relationship between DIC flux and landscape variables known to regulate riverine DIC, we extrapolate to a DIC flux of 57 ± 9.9 Tg C yr−1for the full pan-arctic basin, and show that DIC export increases with runoff, the extent of carbonate rocks and glacial coverage, but decreases with permafrost extent. This pan-arctic riverine DIC estimate represents 13–15% of the total global DIC flux. The annual flux of selected ions (HCO3−, Na+, Ca2+, Mg2+, Sr2+, and Cl−) from the six largest Arctic rivers confirms that chemical weathering is dominated by inputs from carbonate rocks in the North American watersheds, but points to a more important role for silicate rocks in Siberian watersheds. In the coastal ocean, river water-induced decreases in aragonite saturation (i.e., an ocean acidification effect) appears to be much more pronounced in Siberia than in the North American Arctic, and stronger in the winter and spring than in the late summer. Accounting for seasonal variation in the flux of DIC and other major ions gives a much clearer understanding of the importance of riverine DIC within the broader pan-arctic C cycle.
    Description
    Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 26 (2012): GB4018, doi:10.1029/2011GB004192.
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    • Ecosystems Center
    Suggested Citation
    Global Biogeochemical Cycles 26 (2012): GB4018
     

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