Importance of hydrothermal vents in scavenging removal of 230Th in the Nansen Basin

In this study we present dissolved and particulate 230Th and 232Th results, as well as particulate 234Th data, obtained as part of the GEOTRACES central Arctic Ocean sections GN04 (2015) and IPY11 (2007). Samples were analyzed following GEOTRACES methods, and compared to previous results from 1991....

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Valk, Ole, Rutgers v. d. Loeff, Michiel, Geibert, Walter, Gdaniec, Sandra, Rijkenberg, Micha J.A., Moran, S. Bradley, Lepore, Kate, Edwards, Robert, Lu, Yanbin, Puigcorbe Lacueva, Viena
Format: Article in Journal/Newspaper
Language:unknown
Published: Wiley 2018
Subjects:
Arctic
Arctic Ocean
Nansen Basin
Online Access:https://epic.awi.de/id/eprint/48073/
https://hdl.handle.net/10013/epic.10601e77-dddd-4329-8dc9-18406f9dc7f9
Description
Summary:In this study we present dissolved and particulate 230Th and 232Th results, as well as particulate 234Th data, obtained as part of the GEOTRACES central Arctic Ocean sections GN04 (2015) and IPY11 (2007). Samples were analyzed following GEOTRACES methods, and compared to previous results from 1991. We observe significant decreases in 230Th concentrations in the deep waters of the Nansen Basin. We ascribe this non-steady state removal process to a variable release and scavenging of trace metals near an ultra-slow spreading ridge. This finding demonstrates that hydrothermal scavenging in the deep-sea may vary on annual time scales and highlights the importance of repeated GEOTRACES sections

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