| Autor: |
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 |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Quaternary Science Advances, Vol 7, Iss , Pp 100054- (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2666-0334 |
| DOI: |
10.1016/j.qsa.2022.100054 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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