The transpolar drift as a source of riverine and shelf-derived trace elements to the central Arctic Ocean

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Charette, Matthew A.
Kipp, Lauren
Jensen, Laramie T.
Dabrowski, Jessica S.
Whitmore, Laura M.
Fitzsimmons, Jessica N.
Williford, Tatiana
Ulfsbo, Adam
Jones, Elizabeth M.
Bundy, Randelle M.
Vivancos, Sebastian M.
Pahnke, Katharina
John, Seth G.
Xiang, Yang
Hatta, Mariko
Petrova, Mariia V.
Heimbürger, Lars-Eric
Bauch, Dorothea
Newton, Robert
Pasqualini, Angelica
Agather, Alison
Amon, Rainer M. W.
Anderson, Robert F.
Andersson, Per S.
Benner, Ronald
Bowman, Katlin
Edwards, R. Lawrence
Gdaniec, Sandra
Gerringa, Loes J. A.
González, Aridane G.
Granskog, Mats A.
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, Christopher I.
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
van der Loeff, Michiel Rutgers
Saito, Mak A.
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
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Arctic Ocean
Transpolar Drift
trace elements
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.
Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(5), (2020): e2019JC015920, doi:10.1029/2019JC015920.
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Charette, M. A., Kipp, L. E., Jensen, L. T., Dabrowski, J. S., Whitmore, L. M., Fitzsimmons, J. N., Williford, T., Ulfsbo, A., Jones, E., Bundy, R. M., Vivancos, S. M., Pahnke, K., John, S. G., Xiang, Y., Hatta, M., Petrova, M., V., Heimburger-Boavida, L., Bauch, D., Newton, R., Pasqualini, A., Agather, A. M., Amon, R. M. W., Anderson, R. F., Andersson, P. S., Benner, R., Bowman, K. L., Edwards, R. L., Gdaniec, S., Gerringa, L. J. A., Gonzalez, A. G., Granskog, M., Haley, B., Hammerschmidt, C. R., Hansell, D. A., Henderson, P. B., Kadko, D. C., Kaiser, K., Laan, P., Lam, P. J., Lamborg, C. H., Levier, M., Li, X., Margolin, A. R., Measures, C., Middag, R., Millero, F. J., Moore, W. S., Paffrath, R., Planquette, H., Rabe, B., Reader, H., Rember, R., Rijkenberg, M. J. A., Roy-Barman, M., van der Loeff, M. R., Saito, M., Schauer, U., Schlosser, P., Sherrell, R. M., Shiller, A. M., Slagter, H., Sonke, J. E., Stedmon, C., Woosley, R. J., Valk, O., van Ooijen, J., & Zhang, R. (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.
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