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dc.contributor.authorEwing, Stephanie A.
dc.contributor.authorO'Donnell, Jonathan A.
dc.contributor.authorAiken, George R.
dc.contributor.authorButler, Kenna
dc.contributor.authorButman, David
dc.contributor.authorWindham-Myers, Lisamarie
dc.contributor.authorKanevskiy, Mikhail Z.
dc.identifier.citationEwing, Stephanie A., Jonathan A. O’Donnell, George R. Aiken, Kenna Butler, David Butman, Lisamarie Windham-Myers, and Mikhail Z. Kanevskiy. “Long-Term Anoxia and Release of Ancient, Labile Carbon Upon Thaw of Pleistocene Permafrost.” Geophysical Research Letters 42, no. 24 (December 23, 2015): 10,730–10,738. doi:10.1002/2015gl066296.en_US
dc.description.abstractThe fate of permafrost carbon upon thaw will drive feedbacks to climate warming. Here we consider the character and context of dissolved organic carbon (DOC) in yedoma permafrost cores from up to 20 m depth in central Alaska. We observed high DOC concentrations (4 to 129 mM) and consistent low molecular weight organic acid concentrations in three cores. We estimate a DOC production rate of 12 µmol DOC m−2 yr−1 based on model ages of up to ~200 kyr derived from uranium isotopes. Acetate C accounted for 24 ± 1% of DOC in all samples. This proportion suggests long-term anaerobiosis and is likely to influence thaw outcomes due to biolability of acetate upon release in many environments. The combination of uranium isotopes, ammonium concentrations, and calcium concentrations explained 86% of the variation in thaw water DOC concentrations, suggesting that DOC production may be related to both reducing conditions and mineral dissolution over time.en_US
dc.description.sponsorshipUSGS through the Climate and Land Use Change Mission Area and the NRC postdoc program; Montana State University Vice President of Research and College of Agriculture; the Montana Agricultural Experiment Station; National Science Foundation (EAR 0630257)en_US
dc.titleLong-term anoxia and release of ancient, labile carbon upon thaw of Pleistocene permafrosten_US
mus.citation.journaltitleGeophysical Research Lettersen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US

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