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  • 1.
    Charette, M
    et al.
    Woods Hole Oceanographic Institution.
    Kipp, L
    Woods Hole Oceanographic Institution.
    Jensen, L.T.
    Lamont-Doherty Earth Observatory.
    Dabrowski, J.S.
    Woods Hole Oceanographic Institution.
    Whitmore, L.M.
    University of Southern Mississippi.
    Fitzsimmons, J.N.
    Texas A&M University.
    Williford, T
    Texas A&M University.
    Ulfsbo, A
    Göteborgs Universitet.
    Jones, E
    Fram Centre Norway.
    Bundy, R.M.
    Woods Hole Oceanographic Institution.
    Vivanacos, S.M.
    Columbia University New York.
    Pahnke, K
    University of Oldenburg.
    John, S.G.
    University of Southern California.
    Xiang, Y
    University of California Santa Cruz.
    Hatta, M
    University of Hawaii.
    Petrova, M.V.
    Aix Marseille University.
    Heimburger-Boavida, L.-E.
    Aix Marseille University.
    Bauch, D
    GEOMAR Kiel.
    Newton, R
    Lamont-Doherty Earth Observatory.
    Pasqualini, A
    Columbia University.
    Agather, A.M.
    Wright State University.
    Amon, R.M.W
    Texas A&M University.
    Anderson, R.F.
    Lamont-Doherty Earth Observatory.
    Andersson, P.S.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Benner, R
    University of South Carolina.
    Bowman, K.L.
    University of California Santa Cruz.
    Edwards, R.L.
    University of Minnesota.
    Gdaniec, Sandra
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Gerringa, L.J.A.
    Utrecht University.
    González, A.G.
    University of Brest.
    Granskog, M
    Norwegian Polar Institute.
    Haley, B
    Oregon State University.
    Hammerschmidt, C.R.
    Wright State University.
    Hansell, D
    University of Miami.
    Henderson, P.B.
    Woods Hole Oceanographic Institution.
    Kadko, D.C.
    Florida International University.
    Kaiser, K
    Texas A&M University.
    Laan, P
    Utrecht University.
    Lam, P
    University of California Santa Cruz.
    Lamborg, C.H.
    University of California Santa Cruz.
    Levier, M
    Université Paris.Saclay.
    Li, X
    University of Minnesota.
    Margolin, A.R.
    University of Miami.
    Measures, C
    University of Hawaii.
    Middag, R
    Utrecht University.
    Millero, F
    Univerity of Miami.
    Moore, W
    University of South Carolina.
    Paffrath, R
    University of Oldenburg.
    Planquette, H
    Univerity of Brest.
    Rabe, B
    Alfred Wegener Institute Bremerhaven.
    Reader, H
    Technical University Denmark.
    Rember, R
    University of Alaska.
    Rijkenberg, M.J.A
    University of Utrecht.
    Roy-Barman, M
    Université Paris-Saclay.
    Rutgers van der Loeff, M
    Alfred Wgener Institute Bremerhaven.
    Saito, M
    Woods Hole Oceanographic Institution.
    Scahuer, U
    Alfred Wegener Institut Bremerhaven.
    Schlosser, P
    Columbia University.
    Sherrell, R.M.
    Rutgers Universty.
    Shiller, A
    University of Southern Mississippi.
    Slagter, H
    University of Minnesota.
    Sonke, J.E.
    Université Paul-Sabatier Tolouse III.
    Stedmon, C
    Technical University Denmark.
    Woosley, R.J.
    University of Miami.
    Valk, O
    Alfred Wegener Institut Bremerhaven.
    van Ooijen, J.
    Utrech University.
    Zhang, R
    University of Southern California.
    The Transpolar Drift as a Source of Riverine and Shelf‐Derived Trace Elements to the Central Arctic Ocean2020Inngår i: Journal of Geophysical Research - Oceans, ISSN 2169-9275, E-ISSN 2169-9291, Vol. 125, s. 1-34Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    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 openocean 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(106m3 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 hydrologicc ycle and permafrost degradation will likely lead to an increase in the flux of TEIs into the Arctic Ocean.

    Fulltekst (pdf)
    fulltext
  • 2.
    Gdaniec, Sandra
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Roy-Barman, M
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ Université Paris-Saclay, Gif-sur-Yvette, France.
    Levier, M
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ Université Paris-Saclay, Gif-sur-Yvette, France.
    Valk, O
    Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
    Rutgers van der Loeff, M
    Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany.
    Foliot, L
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ Université Paris-Saclay, Gif-sur-Yvette, France.
    Dapoigny, A
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ Université Paris-Saclay, Gif-sur-Yvette, France.
    Missiaen, L
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ Université Paris-Saclay, Gif-sur-Yvette, France.
    Mörth, C-M
    Stockholm University.
    Andersson, P.S.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    231Pa and 230Th in the Arctic Ocean: Implications for boundary scavenging and 231Pa-230Th fractionation in the Eurasian Basin2020Inngår i: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, s. 1-14, artikkel-id 119380Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    231Pa, 230Th and 232Th were analyzed in filtered seawater (n=70) and suspended particles (n=39) collected along a shelf-basin transect from the Barents shelf to the Makarov Basin in the Arctic Ocean during GEOTRACE Ssection GN04 in 2015. The distribution of dissolved 231Pa and 230Th in the Arctic Ocean deviates from the linear increase expected from reversible scavenging. Higher 232Th concentrations were observed at the shelf, slope and in surface waters in the deep basin, pointing at lithogenic sources. Fractionation factors (FTh/Pa) observed at the Nansen margin were higher compared to FTh/Pa in the central Nansen Basin, possibly due to the residual occurrence of hydrothermal particles in the deep central Nansen Basin. Application of a boundary scavenging model quantitatively accounts for the dissolved and particulate 230Th distributions in the Nansen Basin. Modelled dissolved 231Pa distributions were largely overestimated, which was attributed to the absence of incorporation of water exchange with the Atlantic Ocean in the model. 231Pa/230Th ratios of the suspended particles of the Nansen Basin were below the 231Pa/230Th production ratio, but top-core sediments of the Nansen margin and slope have high 231Pa/230Th-ratios, suggesting that scavenging along the Nansen margin partly actsas a sink for the missing Arctic 231Pa.

    Fulltekst (pdf)
    fulltext
  • 3.
    Gdaniec, Sandra
    et al.
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Roy-Barman, Matthieu
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay,Gif-sur-Yvette, France.
    Foliot, Lorna
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay,Gif-sur-Yvette, France.
    Thil, Francois
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay,Gif-sur-Yvette, France.
    Dapoigny, Arnaud
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay,Gif-sur-Yvette, France.
    Burckel, Pierre
    Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay,Gif-sur-Yvette, France.
    Garcia-Orellana, Jordi
    Institut de Ciència i Tecnologia Ambientals & Departament de Física, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain.
    Masqué, Pere
    Institut de Ciència i Tecnologia Ambientals & Departament de Física, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain.
    Mörth, Carl-Magnus
    Stockholm University, Department of Geological sciences, Stockholm, Sweden.
    Andersson, Per
    Naturhistoriska riksmuseet, Enheten för geovetenskap.
    Thorium and Protactinium isotopes as tracers of marine particle fluxes and deep water circulation in the Mediterranean Sea2018Inngår i: Marine Chemistry, ISSN 0304-4203, E-ISSN 1872-7581, Vol. 199, s. 12-23Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    231Pa, 230Th and 232Th were analyzed in unfiltered sea water samples (n = 66) and suspended particles (n = 19) collected in the Mediterranean Sea during the MedSeA-GA04-S cruise along the GEOTRACES section GA04S and used to investigate mechanisms controlling the distribution and fractionation of Pa and Th in an ocean margin environment. 231Pa and230Th are particle reactive radionuclides and are often used astracers of processes such as boundary scavenging, particle transport and ocean circulation. The depth profiles of total 231Pa and 230Th concentrations in the Mediterranean Sea displayed non-linear shapes. Higher total 232Th concentrations were observed at the straits and in deepwaters pointing at lithogenic sources. Fractionation factors FTh/Pa ranged from 1.4 to 9. Application of a box-model illustrated that 94 % of the 231Pa and almost all of the 230Th (99.9 %) produced in the Mediterranean Sea is removed to the sediment by scavenging. The negligible export of 230Th to the Atlantic Ocean, leads to a reevaluation of the mean settling speed of the filtered particles, which is now estimated to 500-1000 m/y. The low FTh/Pa fractionation factors are attributed to the efficient scavenging and lack of transport of 231Pa to the Atlantic Ocean.

    Fulltekst (pdf)
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