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dc.contributor.authorYi, Y.  Concept link
dc.contributor.authorGibson, J. J.  Concept link
dc.contributor.authorCooper, Lee W.  Concept link
dc.contributor.authorHelie, J.-F.  Concept link
dc.contributor.authorBirks, S. J.  Concept link
dc.contributor.authorMcClelland, James W.  Concept link
dc.contributor.authorHolmes, Robert M.  Concept link
dc.contributor.authorPeterson, Bruce J.  Concept link
dc.date.accessioned2012-04-23T19:25:25Z
dc.date.available2014-10-22T08:57:25Z
dc.date.issued2012-03-22
dc.identifier.citationGlobal Biogeochemical Cycles 26 (2012): GB1027en_US
dc.identifier.urihttps://hdl.handle.net/1912/5147
dc.descriptionAuthor 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): GB1027, doi:10.1029/2011GB004159.en_US
dc.description.abstractWe present the results of a 4-year collaborative sampling effort that measured δ18O, δ2H values and 3H activities in the six largest Arctic rivers (the Ob, Yenisey, Lena, Kolyma, Yukon and Mackenzie). Using consistent sampling and data processing protocols, these isotopic measurements provide the best available δ2H and 3H estimates for freshwater fluxes from the pan-Arctic watershed to the Arctic Ocean and adjacent seas, which complements previous efforts with δ18O and other tracers. Flow-weighted annual δ2H values vary from −113.3‰ to −171.4‰ among rivers. Annual 3H fluxes vary from 0.68 g to 4.12 g among basins. The integration of conventional hydrological and landscape observations with stable water isotope signals, and estimation of areal yield of 3H provide useful insights for understanding water sources, mixing and evaporation losses in these river basins. For example, an inverse correlation between the slope of the δ18O-δ2H relation and wetland extent indicates that wetlands play comparatively important roles affecting evaporation losses in the Yukon and Mackenzie basins. Tritium areal yields (ranging from 0.760 to 1.695 10−6 g/km2 per year) are found to be positively correlated with permafrost coverage within the studied drainage basins. Isotope-discharge relationships demonstrate both linear and nonlinear response patterns, which highlights the complexity of hydrological processes in large Arctic river basins. These isotope observations and their relationship to discharge and landscape features indicate that basin-specific characteristics significantly influence hydrological processes in the pan-Arctic watershed.en_US
dc.description.sponsorshipFunding for this research was provided by the U.S. National Science Foundation (OPP-0229302), the National Science and Engineering Research Council of Canada (Discovery grant to JJG and IRD fellowship to YY), the U.S. Geological Survey and the Water Resources Division in the Department of Indian Affairs and Northern Development, Canada.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2011GB004159
dc.subjectArctic riversen_US
dc.subjectDischarge anormalyen_US
dc.subjectFlow-weighted fluxen_US
dc.subjectStable water isotopesen_US
dc.subjectTritiumen_US
dc.titleIsotopic signals (18O, 2H, 3H) of six major rivers draining the pan-Arctic watersheden_US
dc.typeArticleen_US
dc.description.embargo2012-09-22
dc.identifier.doi10.1029/2011GB004159


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