The 16th International Conference on Accelerator Mass Spectrometry

Late Pleistocene reconstruction using sedimentary major elements and Be-10 from Lake Biwa, Japan

PSA-12

21 Oct 2024, 17:35

20m

Lobby and Hallway , 2nd Floor (( Poster session A should be set up in the morning.))

Poster Applications in Climate Studies Poster Session A

Speaker

Takahiro Aze (Atmosphere and Ocean Research Institute, the University of Tokyo)

Description

Advances in Accelerator Mass Spectrometry (AMS) have made palaeoclimate reconstructions using meteoric cosmogenic nuclides available for a wide range of environments, including ocean, lake and ice cores (Raisbeck et al., 2007; Yokoyama et al., 2016; Behrens et al., 2022). Here, we report a Be-10 record for the past 45,000 years using sediments from Lake Biwa, the largest lake in Japan. The core was obtained in 2007, and the Be-10 concentration was measured using the previously reported method (Yokoyama et al., 2019). The Be-10 measurement was performed at the Micro Analysis Laboratory, Tandem Accelerator, University of Tokyo (Matsuzaki et al., 2020). The reconstructed Be-10 fluxes show fluctuations and are correlated with the major element fluxes also measured for the sediments. They are controlled by regional climate changes during the Late Pleistocene, probably induced by changes in the East Asian monsoon.　

Raisbeck, G. M. et al., Clim. Past, 3, 541–547, 2007.
Yokoyama, Y. et al., Proc Natl Acad Sci U S A. Mar 1;113(9):2354-9, 2016.
Behrens, B.C. et al., Quat. Sci. Adv., 7, Article 100054, 2022.
Matsuzaki, H. et al., Nucl. Instr. Meth. Phys. Res. B463, 55-63, 2020.