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 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...
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Online Access: | https://doi.org/10.1016/j.qsa.2022.100054 https://doaj.org/article/b3d6e1ee25dd45979771b5337ffdee53 |
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ftdoajarticles:oai:doaj.org/article:b3d6e1ee25dd45979771b5337ffdee53 2023-05-15T13:59:06+02:00 Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency Bethany C. Behrens Yusuke Yokoyama Yosuke Miyairi Adam D. Sproson Masako Yamane Francisco J. Jimenez-Espejo Robert M. McKay Katelyn M. Johnson Carlota Escutia Robert B. Dunbar 2022-07-01T00:00:00Z https://doi.org/10.1016/j.qsa.2022.100054 https://doaj.org/article/b3d6e1ee25dd45979771b5337ffdee53 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S2666033422000077 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2022.100054 https://doaj.org/article/b3d6e1ee25dd45979771b5337ffdee53 Quaternary Science Advances, Vol 7, Iss , Pp 100054- (2022) Holocene East Antarctica Cosmogenic nuclides Beryllium isotopes Scavenging Geography. Anthropology. Recreation G Archaeology CC1-960 article 2022 ftdoajarticles https://doi.org/10.1016/j.qsa.2022.100054 2022-12-30T19:53:49Z The Adélie 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Quaternary Science Advances 7 100054 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Holocene East Antarctica Cosmogenic nuclides Beryllium isotopes Scavenging Geography. Anthropology. Recreation G Archaeology CC1-960 |
spellingShingle |
Holocene East Antarctica Cosmogenic nuclides Beryllium isotopes Scavenging Geography. Anthropology. Recreation G Archaeology CC1-960 Bethany C. Behrens Yusuke Yokoyama Yosuke Miyairi Adam D. Sproson Masako Yamane Francisco J. Jimenez-Espejo Robert M. McKay Katelyn M. Johnson Carlota Escutia Robert B. Dunbar Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency |
topic_facet |
Holocene East Antarctica Cosmogenic nuclides Beryllium isotopes Scavenging Geography. Anthropology. Recreation G Archaeology CC1-960 |
description |
The Adélie 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. |
format |
Article in Journal/Newspaper |
author |
Bethany C. Behrens Yusuke Yokoyama Yosuke Miyairi Adam D. Sproson Masako Yamane Francisco J. Jimenez-Espejo Robert M. McKay Katelyn M. Johnson Carlota Escutia Robert B. Dunbar |
author_facet |
Bethany C. Behrens Yusuke Yokoyama Yosuke Miyairi Adam D. Sproson Masako Yamane Francisco J. Jimenez-Espejo Robert M. McKay Katelyn M. Johnson Carlota Escutia Robert B. Dunbar |
author_sort |
Bethany C. Behrens |
title |
Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency |
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 |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://doi.org/10.1016/j.qsa.2022.100054 https://doaj.org/article/b3d6e1ee25dd45979771b5337ffdee53 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Subglacial Basin |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Wilkes Subglacial Basin |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf |
op_source |
Quaternary Science Advances, Vol 7, Iss , Pp 100054- (2022) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S2666033422000077 https://doaj.org/toc/2666-0334 2666-0334 doi:10.1016/j.qsa.2022.100054 https://doaj.org/article/b3d6e1ee25dd45979771b5337ffdee53 |
op_doi |
https://doi.org/10.1016/j.qsa.2022.100054 |
container_title |
Quaternary Science Advances |
container_volume |
7 |
container_start_page |
100054 |
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1766267472486334464 |