Circumpolar Deep Water upwelling is a primary source of 10Be in Antarctic continental shelf sediments

Matt Jeromson, Toshiyuki Fujioka, David Fink, Krista Simon, James Smith, Claus Dieter Hillenbrand, Gerhard Kuhn, Alexandra L. Post, Jose Tonatiuh SANCHEZ-PALACIOS, Marcello Blaxell, T. Gabriel Enge, Duanne White

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalGlobal and Planetary Change
DOIs
Publication statusE-pub ahead of print - Mar 2024

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