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Impacts Of Climate Warming And Permafrost Thaw On The Riverine Transport Of Nitrogen And Phosphorus To The Kara Sea, Karen E. Frey, James W. Mcclelland, Robert M. Holmes, Laurence G. Smith

Geography

Measurements of nitrogen and phosphorus (N and P) concentrations from previously unstudied streams and rivers throughout west Siberia suggest that climate warming and/or associated permafrost thaw will likely amplify the transport of N and P to the Kara Sea and adjacent Arctic Ocean. We present concentrations of dissolved organic nitrogen (DON), ammonium (NH4-N), nitrate (NO3-N), total dissolved nitrogen (TDN), and total dissolved phosphorus (TDP) from 96 streams and rivers within the Ob'-Iriysh, Nadym, and Pur river drainage basins. The sampled sites span ∼106 km2, a large climatic gradient (∼55°N-68°N), and include 41 cold, permafrost-influenced and 55 warm, permafrost-free watersheds. Concentrations …