Articles | Volume 16, issue 1
Research article
14 Feb 2020
Research article |  | 14 Feb 2020

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

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Cited articles

Aagaard, K., Coachman, L. K., and Carmack, E. C.: On the halocline of the Arctic Ocean, Deep-Sea Res., 28, 529–545, 1980. 
Aagaard, K.: On the deep circulation in the Arctic Ocean, Deep-Sea Res., 28, 251–268,, 1981. 
Aksenov, Y., Ivanov, V. V., Nurser, A. J. G., Bacon, S., Polyakov, I. V., Coward, A. C., Naveira-Garabato, A. C., and Beszczynska-Moeller, A.: The Arctic Circumpolar Boundary Current, J. Geophys. Res., 116, C09017,, 2011. 
Anderson, R. F., Bacon, M. P., and Brewer, P. G.: Removal of 230Th and 231Pa from the open ocean, Earth Planet. Sc. Lett., 62, 7–23, 1983a. 
Anderson, R. F., Bacon, M. P., and Brewer, P. G.: Removal of 230Th and 231Pa at ocean margins, Earth Planet. Sc. Lett., 66, 73–90, 1983b. 
Short summary
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.