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

The Adélie Basin is a relatively small (∼1600 km), 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...

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Autores: Behrens, Bethany C., Yokoyama, Yusuke, Miyairi, Yosuke, Sproson, Adam D., Yamane, Masako, Jiménez-Espejo, Francisco J., McKay, Robert M., Johnson, Katelyn M., Escutia, Carlota, Dunbar, Robert B.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/334090
Acesso em linha:http://hdl.handle.net/10261/334090
Access Level:acceso abierto
Palavra-chave:Holocene
East Antarctica
Cosmogenic nuclides
Beryllium isotopes
Scavenging
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spelling Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiencyBehrens, Bethany C.Yokoyama, YusukeMiyairi, YosukeSproson, Adam D.Yamane, MasakoJiménez-Espejo, Francisco J.McKay, Robert M.Johnson, Katelyn M.Escutia, CarlotaDunbar, Robert B.HoloceneEast AntarcticaCosmogenic nuclidesBeryllium isotopesScavengingThe Adélie Basin is a relatively small (∼1600 km), 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 ((Be/Be)) 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 (Be/Be) record provides insight into changes in freshwater input, primary productivity, and scavenging efficiency, while removing the influence of particle size on Be concentration. During the early Holocene, (Be/Be) 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 (Be/Be) as a proxy for ice shelf cover and glacial dynamics.Financial 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.Elsevier BVEuropean CommissionJapan Society for the Promotion of ScienceMinisterio de Ciencia e Innovación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2023202320222023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/334090reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-89711-C2-1-Phttp://dx.doi.org/10.1016/j.qsa.2022.100054Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3340902026-05-22T06:33:51Z
dc.title.none.fl_str_mv Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
title Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
spellingShingle Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
Behrens, Bethany C.
Holocene
East Antarctica
Cosmogenic nuclides
Beryllium isotopes
Scavenging
title_short Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
title_full Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
title_fullStr Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
title_full_unstemmed Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
title_sort Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
dc.creator.none.fl_str_mv Behrens, Bethany C.
Yokoyama, Yusuke
Miyairi, Yosuke
Sproson, Adam D.
Yamane, Masako
Jiménez-Espejo, Francisco J.
McKay, Robert M.
Johnson, Katelyn M.
Escutia, Carlota
Dunbar, Robert B.
author Behrens, Bethany C.
author_facet Behrens, Bethany C.
Yokoyama, Yusuke
Miyairi, Yosuke
Sproson, Adam D.
Yamane, Masako
Jiménez-Espejo, Francisco J.
McKay, Robert M.
Johnson, Katelyn M.
Escutia, Carlota
Dunbar, Robert B.
author_role author
author2 Yokoyama, Yusuke
Miyairi, Yosuke
Sproson, Adam D.
Yamane, Masako
Jiménez-Espejo, Francisco J.
McKay, Robert M.
Johnson, Katelyn M.
Escutia, Carlota
Dunbar, Robert B.
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Japan Society for the Promotion of Science
Ministerio de Ciencia e Innovación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Holocene
East Antarctica
Cosmogenic nuclides
Beryllium isotopes
Scavenging
topic Holocene
East Antarctica
Cosmogenic nuclides
Beryllium isotopes
Scavenging
description The Adélie Basin is a relatively small (∼1600 km), 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 ((Be/Be)) 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 (Be/Be) record provides insight into changes in freshwater input, primary productivity, and scavenging efficiency, while removing the influence of particle size on Be concentration. During the early Holocene, (Be/Be) 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 (Be/Be) as a proxy for ice shelf cover and glacial dynamics.
publishDate 2022
dc.date.none.fl_str_mv 2022
2023
2023
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/334090
url http://hdl.handle.net/10261/334090
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-89711-C2-1-P
http://dx.doi.org/10.1016/j.qsa.2022.100054
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.228081

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