[M-ZZ49] Frontiers of Geochemistry: Pioneering Research in a Changing World

2:30 PM - 2:45 PM JST(5:30 AM - 5:45 AM UTC)

[MZZ49-03] Cosmogenic Beryllium isotope to Understanding Antarctic Ice and Ocean Dynamics

*Yusuke Yokoyama^1,2,3, Adam D Sproson⁴, Bethany B Behrens¹, Karin Nemoto^1,2 (1.Atmosphere and Ocean Research Institute, University of Tokyo, 2.Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, 3.Research School of Physics, The Australian National University, 4.National Oceanography Centre, UK)

Keywords:

Accelerator Mass Spectrometry,Antarctic Ice Sheet,Ice Shelf,Weathering

An Accelerator Mass Spectrometry is a technique that is allowed to measure nuclides existing in extremely small amounts in nauture. Recent developments including preparation methods (Sproson et al., 2021a; Yokoyama et al., 2019) enabled us to measure cosmogenic nuclides, such as ¹⁰Be, expanding the applications of Beryllium in the field of Earth sciences. To understand the relationship between ice sheets and changes in the global sea level, long-term records of ice mass loss dating from before the beginning of the historical record are needed. One method is surface exposure dating, which uses the accumulation of ¹⁰Be on rock surfaces after ice melts to determine the age of glacial deposits. However, this method only provides data on the most recent deglacial events, and the records are often incomplete. To overcome these limitations and gain additional insight, we studied the history of ice sheet and ice shelf melting using meteoric ¹⁰Be (von Blanckenburg, F. et al. 2012: Yokoyama & Sproson, 2026). We applied this technique to reconstruct the melting history of the East and West Antarctic ice sheets (Sproson et al., 2021b, 2022) and ice shelves (Yokoyama et al., 2016) during the Holocene. In this presentation, we will introduce our finding the connections with low-latitude climates, such as the El Niño–Southern Oscillation (ENSO).

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Yokoyama et al., 2016, PNAS 113:2354–59
Yokoyama & Sproson, 2026, Annu. Rev. Mar. Sci. 2026. 18:121–39