講演情報
[MZZ49-03]Cosmogenic Beryllium isotope to Understanding Antarctic Ice and Ocean Dynamics
*横山 祐典1,2,3、スプローソン アダム4、ベーレンス ベサニー1、根本 夏林1,2 (1.東京大学 大気海洋研究所 、2.東京大学 理学系研究科 地球惑星科学専攻、3.オーストラリア国立大学 物理学研究所、4.イギリス海洋研究所)
キーワード：
加速器質量分析、南極氷床、棚氷、風化
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).
Behrens et al., 2022, Quat. Sci. Adv. 7:100054
von Blanckenburg, F. et al. 2012, Earth Planet. Sci. Lett. 351:295–305
Sproson et al., 2021a, Rapid Commun Mass Spectrom. 35:e9059.
Sproson et al., 2021b, Quat. Sci. Rev. 256:106841
Sproson et al., 2022, Nat. Commun. 13:2434
Yokoyama et al., 2016, PNAS 113:2354–59
Yokoyama & Sproson, 2026, Annu. Rev. Mar. Sci. 2026. 18:121–39
Behrens et al., 2022, Quat. Sci. Adv. 7:100054
von Blanckenburg, F. et al. 2012, Earth Planet. Sci. Lett. 351:295–305
Sproson et al., 2021a, Rapid Commun Mass Spectrom. 35:e9059.
Sproson et al., 2021b, Quat. Sci. Rev. 256:106841
Sproson et al., 2022, Nat. Commun. 13:2434
Yokoyama et al., 2016, PNAS 113:2354–59
Yokoyama & Sproson, 2026, Annu. Rev. Mar. Sci. 2026. 18:121–39