Thorium isotopes in the water column in Amundsen Basin during POLARSTERN cruises PS70 (ARK-XXII/2) in 2007 and PS94 (ARK-XXIX/3) in 2015 ...

In this study we present dissolved ²³⁰Th and ²³²Th results, as well as amount of particulate ²³⁴Th from total ²³⁴Th. The 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 res...

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Bibliographic Details
Main Authors: Valk, Ole, Rutgers van der Loeff, Michiel M, Geibert, Walter, Gdaniec, Sandra, Moran, S Bradley, Lepore, Kate, Edwards, R Lawrence, Lu, Y, Puigcorbé, Viena, Casacuberta, Nuria, Paffrath, Ronja, Smethie, William, Roy-Barman, Matthieu
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2019
Subjects:
230Th
Arctic Ocean
GEOTRACES
Time series
Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES
Marine Geochemistry @ AWI AWI_MarGeoChem
Amundsen Basin
Arctic
Barents Sea
amundsen basin
Online Access:https://dx.doi.org/10.1594/pangaea.908068
https://doi.pangaea.de/10.1594/PANGAEA.908068
Description
Summary:In this study we present dissolved ²³⁰Th and ²³²Th results, as well as amount of particulate ²³⁴Th from total ²³⁴Th. The 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 intermediate waters of the Amundsen Basin. This removal was explained by scavenging removal of dissolved ²³⁰Th on the Barents Sea Shelf and along Atlantic water inflow pathways. This finding shows that a far-field decrease of dissolved ²³⁰Th can be caused by changes in scavenging on inflow passages and highlights the importance of repeated GEOTRACES sections. ...

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