@article{8550b5f0b9134a3480578a621e6e23a0,
title = "Circumpolar Deep Water upwelling is a primary source of 10Be in Antarctic continental shelf sediments",
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. ",
keywords = "Antarctica, Beryllium-isotopes, Circumpolar deep water, Ice shelf, Sediment proxy",
author = "Matt Jeromson and Toshiyuki Fujioka and David Fink and Krista Simon and James Smith and Hillenbrand, \{Claus Dieter\} and Gerhard Kuhn and Post, \{Alexandra L.\} and SANCHEZ-PALACIOS, \{Jose Tonatiuh\} and Marcello Blaxell and Enge, \{T. Gabriel\} and Duanne White",
note = "Funding Information: We would like to thank AINSE Ltd. for providing financial assistance (12384 – PGRA) to enable work to measure 10Be from our sediment samples. ANSTO (portal – 11844) also supported the preparation and measurement of AMS targets. We acknowledge the financial support from the Australian Government to the Centre for Accelerator Science, ANSTO, through the National Collaborative Research Infrastructure Strategy (NCRIS). We thank Klaus Wilcken for some assistance in measuring 10Be AMS samples. We thank Carly Beggs \& Brett Knowles for assistance with ICP-MS measurements. We thank the captains and crew of RRS James Clark Ross and RV Polarstern for help in obtaining the marine samples analysed in this study. Recovery of sub-ice-shelf samples was funded by NERC grants NE/H009205/1 (Larsen-C, George VI), NE/L013770/1 (Ronne-Filchner), and NSF grants ANT-0732926 and ANT 0732730 (PIG). We also thank Helen Bostock and Layla Creac'h for early feedback on the manuscript. We thank the two anonymous reviewers for comments that improved the manuscript. Funding Information: We would like to thank AINSE Ltd. for providing financial assistance (12384 – PGRA) to enable work to measure 10 Be from our sediment samples. ANSTO (portal – 11844) also supported the preparation and measurement of AMS targets . We acknowledge the financial support from the Australian Government to the Centre for Accelerator Science , ANSTO , through the National Collaborative Research Infrasttructure Strategy (NCRIS) . We thank Klaus Wilcken for some assistance in measuring 10 Be AMS samples. We thank Carly Beggs \& Brett Knowles for assistance with ICP-MS measurements. We thank the captains and crew of RRS James Clark Ross and RV Polarstern for help in obtaining the marine samples analysed in this study. Recovery of sub-ice-shelf samples was funded by NERC grants NE/H009205/1 (Larsen-C, George VI), NE/L013770/1 (Ronne-Filchner), and NSF grants ANT-0732926 and ANT 0732730 ( PIG). We also thank Helen Bostock and Layla Creac'h for early feedback on the manuscript. We thank the two anonymous reviewers for comments that improved the manuscript. Publisher Copyright: {\textcopyright} 2024 Elsevier B.V.",
year = "2024",
month = may,
doi = "10.1016/j.gloplacha.2024.104424",
language = "English",
volume = "236",
pages = "1--11",
journal = "Global and Planetary Change",
issn = "0921-8181",
publisher = "Elsevier",
}
SDG 14 Life Below Water