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Sci Adv. 2018 Jan 3;4(1):eaao1302. doi: 10.1126/sciadv.aao1302. eCollection 2018 Jan.

Increased fluxes of shelf-derived materials to the central Arctic Ocean.

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Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.
Massachusetts Institute of Technology-Woods Hole Oceanographic Institution Joint Program in Oceanography/Applied Ocean Science and Engineering, Woods Hole, MA 02543, USA.
Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC 29208, USA.
Applied Physics Laboratory and Department of Atmospheric Sciences, University of Washington, Seattle, WA 98105, USA.


Rising temperatures in the Arctic Ocean region are responsible for changes such as reduced ice cover, permafrost thawing, and increased river discharge, which, together, alter nutrient and carbon cycles over the vast Arctic continental shelf. We show that the concentration of radium-228, sourced to seawater through sediment-water exchange processes, has increased substantially in surface waters of the central Arctic Ocean over the past decade. A mass balance model for 228Ra suggests that this increase is due to an intensification of shelf-derived material inputs to the central basin, a source that would also carry elevated concentrations of dissolved organic carbon and nutrients. Therefore, we suggest that significant changes in the nutrient, carbon, and trace metal balances of the Arctic Ocean are underway, with the potential to affect biological productivity and species assemblages in Arctic surface waters.

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