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

Jeromson, Matthew R.; Fujioka, Toshiyuki; Fink, David; Simon, Krista; Smith, James ORCID: https://orcid.org/0000-0002-1333-2544; Hillenbrand, Claus-Dieter ORCID: https://orcid.org/0000-0003-0240-7317; Kuhn, Gerhard; Post, Alexandra L.; Sánchez-Palacios, Jose Tonatiuh; Blaxell, Marcello; Enge, T. Gabriel; White, Duanne A.. 2024 Circumpolar deep water upwelling is a primary source of 10Be in Antarctic continental shelf sediments. Global and Planetary Change, 236, 104424. 11, pp. https://doi.org/10.1016/j.gloplacha.2024.104424

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Abstract/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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.gloplacha.2024.104424
ISSN:	09218181
Additional Keywords:	Antarctica, Beryllium-isotopes, Ice shelf, Circumpolar deep water, Sediment proxy
Date made live:	26 Mar 2024 15:26 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537174

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