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. W...

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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., Puigcorbe, Viena
Format: Text
Language:unknown
Published: Edith Cowan University, Research Online, Perth, Western Australia 2018
Subjects:
GEOTRACES
230Th time series
hydrothermal vents
230Th scavenging removal
Arctic Ocean
Gakkel Ridge
Geophysics and Seismology
Arctic
Nansen Basin
Online Access:https://ro.ecu.edu.au/ecuworkspost2013/5268
https://doi.org/10.1029/2018GL079829
https://ro.ecu.edu.au/context/ecuworkspost2013/article/6275/viewcontent/Valk_et_al_2018_Geophysical_Research_Letters.pdf
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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 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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