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

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

Matthew R. Jeromson, Toshiyuki Fujioka, David Fink, Krista Simon, James Smith, Claus-Dieter Hillenbrand, Gerhard Kuhn, Alexandra Post, Tona Sanchez-Palacios, Marcello Blaxell, …
Global and Planetary Change, Vol.236, 104424
2024
DOI: https://doi.org/10.1016/j.gloplacha.2024.104424
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Embargoed Access, Embargo ends: 01/04/2026

Abstract

Beryllium-10 (10Be) has been proposed as 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, making any inferences about its concentration in sediments challenging. We present a dataset of 9Be and 10Be concentrations, and 10Be/9Be ratios in seafloor surface sediments from the Antarctic continental shelf - including from sub ice shelf cores - 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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