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

Type Article
Date 2022-07
Language English
Author(s) Behrens Bethany C.ORCID1, 2, Yokoyama Yusuke1, 2, 3, 4, 5, Miyairi Yosuke1, Sproson Adam D.1, 4, Yamane Masako6, Jimenez-Espejo Francisco J.4, 7, McKay Robert M.8, Johnson Katelyn M.8, 9, Escutia Carlota7, Dunbar Robert B.10
Affiliation(s) 1 : Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8564, Japan
2 : Graduate Program on Environmental Science, University of Tokyo, Komaba, Meguro, Tokyo, 153-0041, Japan
3 : Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Hongo, Bunkyō, Tokyo, 113-8654, Japan
4 : Biogeochemistry Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Natsushimacho, Yokosuka, Kanagawa Prefecture, 237-0061, Japan
5 : Research School of Physics, The Australian National University, Acton ACT, 2601, Australia
6 : Institute for Space-Earth Environmental Research, Nagoya University, Furocho, Chikusa, Nagoya, Aichi, 464-8601, Japan
7 : Andalusian Earth Sciences Institute (IACT), CSIC-University of Granada, Armilla, Spain
8 : Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand
9 : GNS Science, National Ice Core Research Laboratory, Lower Hutt, New Zealand
10 : School of Earth, Energy, and Environmental Sciences, Stanford University, Stanford, CA, USA
Source Quaternary Science Advances (2666-0334) (Elsevier BV), 2022-07 , Vol. 7 , P. 100054 (10p.)
DOI 10.1016/j.qsa.2022.100054
Keyword(s) Holocene, East Antarctica, Cosmogenic nuclides, Beryllium isotopes, Scavenging

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 meters 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.

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Behrens Bethany C., Yokoyama Yusuke, Miyairi Yosuke, Sproson Adam D., Yamane Masako, Jimenez-Espejo Francisco J., McKay Robert M., Johnson Katelyn M., Escutia Carlota, Dunbar Robert B. (2022). Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency. Quaternary Science Advances, 7, 100054 (10p.). Publisher's official version : , Open Access version :