Beryllium isotope variations recorded in the Ad´elie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency
Metadatos
Mostrar el registro completo del ítemEditorial
Elsevier
Materia
Holocene East Antarctica Cosmogenic nuclides Beryllium isotopes Scavenging
Fecha
2022-04-18Referencia bibliográfica
Bethany C. Behrens... [et al.]. Beryllium isotope variations recorded in the Adélie Basin, East Antarctica reflect Holocene changes in ice dynamics, productivity, and scavenging efficiency, Quaternary Science Advances, Volume 7, 2022, 100054, ISSN 2666-0334, [https://doi.org/10.1016/j.qsa.2022.100054]
Patrocinador
Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science; Grants-in-Aid for Scientific Research (KAKENHI) 20H00193; Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science 20J21145 PE17712 P18791; New Zealand Ministry of Business, Innovation and Employment (MBIE) ANTA1801; Ministry of Science and Innovation, Spain (MICINN); Spanish Government CTM2017-89711-C2-1-P; European Union through FEDER fundsResumen
The Ad´elie 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 Ad´elie Basin is a ~184 m thick laminated
sediment deposit, the Ad´elie 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 Ad´elie 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 Ad´elie 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.