Circumpolar deep water upwelling is a primary source of 10Be in Antarctic continental shelf sediments

Beryllium-10 (10Be) is proposed to be a potential proxy for investigating ice shelf presence and absence, or meltwater discharge in coastal polar environments. However, the sources and distribution of atmospherically produced meteoric-10Be in the Antarctic marine realm are yet to be fully characteri...

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Bibliographic Details
Published in:Global and Planetary Change
Main Authors: Jeromson, Matthew R., Fujioka, Toshiyuki, Fink, David, Simon, Krista, Smith, James, Hillenbrand, Claus-Dieter, Kuhn, Gerhard, Post, Alexandra L., Sánchez-Palacios, Jose Tonatiuh, Blaxell, Marcello, Enge, T. Gabriel, White, Duanne A.
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier 2024
Subjects:
Antarc*
Antarctic
Ice Sheet
Ice Shelf
Online Access:http://nora.nerc.ac.uk/id/eprint/537174/
https://www.sciencedirect.com/science/article/pii/S0921818124000717
Description
Summary:Beryllium-10 (10Be) is proposed to be a potential proxy for investigating ice shelf presence and absence, or meltwater discharge in coastal polar environments. However, the sources and distribution of atmospherically produced meteoric-10Be in the Antarctic marine realm are yet to be fully characterized. We present a dataset of 9Be and 10Be concentrations, and 10Be/9Be ratios in seafloor surface sediments from the Antarctic continental shelf to assess the sources and processes contributing Be-isotopes to ice-sheet proximal marine settings. We show that upwelling waters (e.g. Circumpolar Deep Water) are a significant source of 10Be to continental shelf sediments. This limits the use of 10Be/9Be as a proxy for ice shelf environment or meltwater discharge, but instead provides a potential proxy for reconstructing Circumpolar Deep Water incursions onto Antarctic continental shelves.

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