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

In this study we present dissolved and particulate 230 Th and 232 Th results, as well as particulate 234 Th 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, O., Rutgers van der Loeff, M.M., Geibert, W., Gdaniec, S., Rijkenberg, M.J.A., Moran, S.B., Lepore, K., Edwards, R.L., Lu, Y., Puigcorbé, V.
Format: Article in Journal/Newspaper
Language:English
Published: 2018
Subjects:
Arctic
Arctic Ocean
Nansen Basin
Online Access:https://www.vliz.be/imisdocs/publications/23/321623.pdf
Description
Summary:In this study we present dissolved and particulate 230 Th and 232 Th results, as well as particulate 234 Th 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 230 Th concentrations in the deep waters of the Nansen Basin. We ascribe this nonsteady state removal process to a variable release and scavenging of trace metals near an ultraslow 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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