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Beryllium isotope variations recorded in the Adelie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency

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dc.contributor.authorBehrens, Bethany C.
dc.contributor.authorYokoyama, Yusuke
dc.contributor.authorMiyairi, Yosuke
dc.contributor.authorSproson, Adam D.
dc.contributor.authorYamane, Masako
dc.contributor.authorJimenez-Espejo, Francisco J.
dc.contributor.authorMcKay, Robert
dc.contributor.authorJohnson, Katelyn M.
dc.contributor.authorEscutia, Carlota
dc.contributor.authorDunbar, Robert B
dc.date.accessioned2026-03-11T04:27:54Z
dc.date.available2026-03-11T04:27:54Z
dc.date.issued2022
dc.date.updated2023-10-01T07:15:48Z
dc.description.abstractThe Adelie Basin is a relatively small (∼1600 km2), semi-enclosed continental shelf bathymetric depression located adjacent to the Wilkes Subglacial Basin, a basin underlying a sector of the East Antarctic Ice Sheet that contains ∼3–4 m sea level equivalent of ice. Located within the Adélie Basin is a ∼184 m thick laminated sediment deposit, the Adélie Drift, ideal for examining regional changes in ice sheet and ocean dynamics. Here, we examine the ratio of reactive beryllium-10 to reactive beryllium-9 ((10Be/9Be)reac) in a marine sediment core obtained from the Adélie Drift to assess these changes during the Holocene epoch (11.7 ka BP to present). The (10Be/9Be)reac record provides insight into changes in freshwater input, primary productivity, and scavenging efficiency, while removing the influence of particle size on 10Be concentration. During the early Holocene, (10Be/9Be)reac ratios indicate increased meltwater discharge from ca. 11.7 to 10 ka BP, as grounded ice retreated from the Adélie Basin and adjacent bathymetric highs. After ∼10 ka BP, beryllium isotopes are influenced by scavenging efficiency and dilution controlled by ocean currents and accumulation rate, operating alongside meltwater input, suggesting there are additional factors to consider when using (10Be/9Be)reac as a proxy for ice shelf cover and glacial dynamics.
dc.description.sponsorshipFinancial support for this study was provided by the Japan Society for the Promotion of Science ( JSPS ) KAKENHI ( 20H00193 ) to YY, JSPS Fellowship DC1 (20J21145) to BCB, and JSPS Post-Doctoral Fellowship (PE17712 and P18791) to ADS. RM was funded by the New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform (ANTA1801). CE and FJJ-E acknowledges funding through Spanish Ministry of Science and Innovation (grant CTM2017-89711-C2-1-P), co-funded by the European Union through FEDER funds.
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn2666-0334
dc.identifier.urihttps://hdl.handle.net/1885/733807246
dc.language.isoen_AUen_AU
dc.provenanceThis is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
dc.publisherScience Direct
dc.rights© 2022 The Authors
dc.rights.licenseCC BY-NC-ND license
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceQuaternary Science Advances
dc.titleBeryllium isotope variations recorded in the Adelie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
dc.typeJournal article
dcterms.accessRightsOpen Access
local.contributor.affiliationBehrens, Bethany C., Atmosphere and Ocean Research Institute, University of Tokyo
local.contributor.affiliationYokoyama, Yusuke, College of Science, ANU
local.contributor.affiliationMiyairi, Yosuke, University of Tokyo
local.contributor.affiliationSproson, Adam D., Atmosphere and Ocean Research Institute, University of Tokyo
local.contributor.affiliationYamane, Masako, Institute for Space-Earth Environmental Research, Nagoya University
local.contributor.affiliationJimenez-Espejo, Francisco J., Biogeochemistry Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
local.contributor.affiliationMcKay, Robert, Victoria University of Wellington
local.contributor.affiliationJohnson, Katelyn M., Antarctic Research Centre, Victoria University of Wellington
local.contributor.affiliationEscutia, Carlota, Instituto Andaluz de Ciencias de la Tierra, CSIC - University de Granada
local.contributor.affiliationDunbar, Robert B, Stanford University
local.contributor.authoruidYokoyama, Yusuke, u3853708
local.description.notesImported from ARIES
local.identifier.absfor370905 - Quaternary environments
local.identifier.absfor370303 - Isotope geochemistry
local.identifier.ariespublicationa383154xPUB33968
local.identifier.citationvolume7
local.identifier.doi10.1016/j.qsa.2022.100054
local.identifier.scopusID2-s2.0-85129378967
local.type.statusPublished Version
publicationvolume.volumeNumber7

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