The Transpolar Drift as a Source of Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean

A major surface circulation feature of the Arctic Ocean is the Transpolar Drift (TPD), a current that transports river‐influenced shelf water from the Laptev and East Siberian Seas toward the center of the basin and Fram Strait. In 2015, the international GEOTRACES program included a high‐resolution pan‐Arctic survey of carbon, nutrients, and a suite of trace elements and isotopes (TEIs). The cruises bisected the TPD at two locations in the central basin, which were defined by maxima in meteoric water and dissolved organic carbon concentrations that spanned 600 km horizontally and ~25‐50 m vertically. Dissolved TEIs such as Fe, Co, Ni, Cu, Hg, Nd, and Th, which are generally particle‐reactive but can be complexed by organic matter, were observed at concentrations much higher than expected for the open ocean setting. Other trace element concentrations such as Al, V, Ga, and Pb were lower than expected due to scavenging over the productive East Siberian and Laptev shelf seas. Using a combination of radionuclide tracers and ice drift modeling, the transport rate for the core of the TPD was estimated at 0.9 ± 0.4 Sv (106 m3 s‐1). This rate was used to derive the mass flux for TEIs that were enriched in the TPD, revealing the importance of lateral transport in supplying materials beneath the ice to the central Arctic Ocean and potentially to the North Atlantic Ocean via Fram Strait. Continued intensification of the Arctic hydrologic cycle and permafrost degradation will likely lead to an increase in the flux of TEIs into the Arctic Ocean.

Full Text

Publisher's official version
777 Mo
Table S1
-430 Ko
Supporting Information S1
6387 Ko
How to cite
Charette Matthew A., Kipp Lauren E., Jensen Laramie T., Dabrowski Jessica S., Whitmore Laura M., Fitzsimmons Jessica N., Williford Tatiana, Ulfsbo Adam, Jones Elizabeth, Bundy Randelle M., Vivancos Sebastian M., Pahnke Katharina, John Seth G., Xiang Yang, Hatta Mariko, Petrova Mariia V., Heimbürger-Boavida Lars-Eric, Bauch Dorothea, Newton Robert, Pasqualini Angelica, Agather Alison M., Amon Rainer M.W., Anderson Robert F., Andersson Per S., Benner Ronald, Bowman Katlin L., Edwards R. Lawrence, Gdaniec Sandra, Gerringa Loes J.A., González Aridane G., Granskog Mats, Haley Brian, Hammerschmidt Chad R., Hansell Dennis A., Henderson Paul B., Kadko David C., Kaiser Karl, Laan Patrick, Lam Phoebe J., Lamborg Carl H., Levier Martin, Li Xianglei, Margolin Andrew R., Measures Chris, Middag Rob, Millero Frank J., Moore Willard S., Paffrath Ronja, Planquette Helene, Rabe Benjamin, Reader Heather, Rember Robert, Rijkenberg Micha J.A., Roy-Barman Matthieu, rutgers van der Loeff Michiel, Saito Mak, Schauer Ursula, Schlosser Peter, Sherrell Robert M., Shiller Alan M., Slagter Hans, Sonke Jeroen E., Stedmon Colin, Woosley Ryan J., Valk Ole, Van Ooijen Jan, Zhang Ruifeng (2020). The Transpolar Drift as a Source of Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean. Journal Of Geophysical Research-oceans. 125 (5). e2019JC015920 (34p.).,

Copy this text