Decrease in 230Th in the Amundsen Basin since 2007: far-field effect of increased scavenging on the shelf?
Ole Valk,Michiel M. Rutgers van der Loeff,Walter Geibert,Sandra Gdaniec,S. Bradley Moran,Kate Lepore,Robert Lawrence Edwards,Yanbin Lu,Viena Puigcorbé,Nuria Casacuberta,Ronja Paffrath,William Smethie,and Matthieu Roy-Barman
Laboratory of Ion Beam Physics, ETH Zurich, 8093 Zurich, Switzerland
Institute of Biogeochemistry and Pollutant Dynamics, Environmental
Physics, ETH Zurich, 8092 Zurich, Switzerland
Ronja Paffrath
Max Planck Research Group for Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment, University of
Oldenburg, 26129 Oldenburg, Germany
William Smethie
Lamont-Doherty Earth Observatory, Palisades, NY 10964-8000, USA
Matthieu Roy-Barman
Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA – CNRS – UVSQ, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
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After 2007 230Th decreased significantly in the central Amundsen Basin. This decrease is accompanied by a circulation change, indicated by changes in salinity. Ventilation of waters is most likely not the reason for the observed depletion in 230Th as atmospherically derived tracers do not reveal an increase in ventilation rate. It is suggested that these interior waters have undergone enhanced scavenging of Th during transit from Fram Strait and the Barents Sea to the central Amundsen Basin.
After 2007 230Th decreased significantly in the central Amundsen Basin. This decrease is...
