TY - JOUR
T1 - Circumpolar Deep Water upwelling is a primary source of 10Be in Antarctic continental shelf sediments
AU - Jeromson, Matt
AU - Fujioka, Toshiyuki
AU - Fink, David
AU - Simon, Krista
AU - Smith, James
AU - Hillenbrand, Claus Dieter
AU - Kuhn, Gerhard
AU - Post, Alexandra L.
AU - SANCHEZ-PALACIOS, Jose Tonatiuh
AU - Blaxell, Marcello
AU - Enge, T. Gabriel
AU - White, Duanne
N1 - 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:
© 2024 Elsevier B.V.
PY - 2024/5
Y1 - 2024/5
N2 - 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.
AB - 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.
KW - Antarctica
KW - Beryllium-isotopes
KW - Circumpolar deep water
KW - Ice shelf
KW - Sediment proxy
UR - http://www.scopus.com/inward/record.url?scp=85189099855&partnerID=8YFLogxK
U2 - 10.1016/j.gloplacha.2024.104424
DO - 10.1016/j.gloplacha.2024.104424
M3 - Article
SN - 0921-8181
VL - 236
SP - 1
EP - 11
JO - Global and Planetary Change
JF - Global and Planetary Change
M1 - 104424
ER -
