Importance of Hydrothermal Vents in Scavenging Removal of 230Th in the Nansen Basin

O. Valk; M. M. Rutgers van der Loeff; W. Geibert; S. Gdaniec; M. J.A. Rijkenberg; S. B. Moran; K. Lepore; R. L. Edwards; Y. Lu; V. Puigcorbé

doi:10.1029/2018GL079829

Importance of Hydrothermal Vents in Scavenging Removal of ²³⁰Th in the Nansen Basin

O. Valk, M. M. Rutgers van der Loeff, W. Geibert, S. Gdaniec, M. J.A. Rijkenberg, S. B. Moran, K. Lepore, R. L. Edwards, Y. Lu, V. Puigcorbé

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	10,539-10,548
Journal	Geophysical Research Letters
Volume	45
Issue number	19
DOIs	https://doi.org/10.1029/2018GL079829
State	Published - Oct 16 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
©2018. The Authors.

Keywords

Arctic Ocean
GEOTRACES
Gakkel Ridge
Th scavenging removal
Th time series
hydrothermal vents

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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title = "Importance of Hydrothermal Vents in Scavenging Removal of 230Th in the Nansen Basin",

abstract = "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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AU - Valk, O.

AU - Rutgers van der Loeff, M. M.

AU - Geibert, W.

AU - Gdaniec, S.

AU - Rijkenberg, M. J.A.

AU - Moran, S. B.

AU - Lepore, K.

AU - Edwards, R. L.

AU - Lu, Y.

AU - Puigcorbé, V.

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AB - 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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KW - Th time series

KW - hydrothermal vents

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