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Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal

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dc.contributor.author Tank, Suzanne E.
dc.contributor.author Frey, Karen E.
dc.contributor.author Striegl, Robert G.
dc.contributor.author Raymond, Peter A.
dc.contributor.author Holmes, Robert M.
dc.contributor.author McClelland, James W.
dc.contributor.author Peterson, Bruce J.
dc.date.accessioned 2012-10-01T16:58:53Z
dc.date.available 2013-02-21T09:45:05Z
dc.date.issued 2012-08-21
dc.identifier.citation Global Biogeochemical Cycles 26 (2012): GB0E02 en_US
dc.identifier.uri http://hdl.handle.net/1912/5407
dc.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): GB0E02, doi:10.1029/2012GB004299. en_US
dc.description.abstract While much of the dissolved organic carbon (DOC) within rivers is destined for mineralization to CO2, a substantial fraction of riverine bicarbonate (HCO3−) flux represents a CO2 sink, as a result of weathering processes that sequester CO2 as HCO3−. We explored landscape-level controls on DOC and HCO3− flux in subcatchments of the boreal, with a specific focus on the effect of permafrost on riverine dissolved C flux. To do this, we undertook a multivariate analysis that partitioned the variance attributable to known, key regulators of dissolved C flux (runoff, lithology, and vegetation) prior to examining the effect of permafrost, using riverine biogeochemistry data from a suite of subcatchments drawn from the Mackenzie, Yukon, East, and West Siberian regions of the circumboreal. Across the diverse catchments that we study, controls on HCO3− flux were near-universal: runoff and an increased carbonate rock contribution to weathering (assessed as riverwater Ca:Na) increased HCO3− yields, while increasing permafrost extent was associated with decreases in HCO3−. In contrast, permafrost had contrasting and region-specific effects on DOC yield, even after the variation caused by other key drivers of its flux had been accounted for. We used ionic ratios and SO4 yields to calculate the potential range of CO2 sequestered via weathering across these boreal subcatchments, and show that decreasing permafrost extent is associated with increases in weathering-mediated CO2 fixation across broad spatial scales, an effect that could counterbalance some of the organic C mineralization that is predicted with declining permafrost. en_US
dc.description.sponsorship Funding for this work was provided through NSF-OPP-0229302 and NSF-OPP-0732985. Additional support to S.E.T. was provided by an NSERC Postdoctoral Fellowship. en_US
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2012GB004299
dc.subject Arctic en_US
dc.subject Bicarbonate en_US
dc.subject Dissolved organic carbon en_US
dc.subject Permafrost en_US
dc.title Landscape-level controls on dissolved carbon flux from diverse catchments of the circumboreal en_US
dc.type Article en_US
dc.description.embargo 2013-02-21 en_US
dc.identifier.doi 10.1029/2012GB004299


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