Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-CC Cryospheric Sciences & Cold District Environment

[A-CC29] Ice cores and paleoenvironmental modeling

Tue. May 22, 2018 3:30 PM - 5:00 PM 201A (2F International Conference Hall, Makuhari Messe)

convener:Ryu Uemura(University of the Ryukyus), Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Ayako Abe-Ouchi(東京大学大気海洋研究所, 共同), Nozomu Takeuchi(Chiba University), Chairperson:Iizuka Yoshinori(北海道大学), Nakazawa Fumio(国立極地研究所)

4:45 PM - 5:00 PM

[ACC29-18] Research of annual cosmic ray events using 10Be in the Dome Fuji ice core II

*Fusa Miyake1, Kazuho Horiuchi2, Hirohisa Sakurai3, Kimiaki Masuda1, Hideaki Motoyama4, Hiroyuki Matsuzaki5, Yuko MOTIZUKI6, Kazuya Takahashi6, Yoichi Nakai6 (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Graduate School of Science and Technology, Hirosaki University, 3.Faculty of Science, Yamagata University, 4.National Institute of Polar Research, 5.MALT, The University Museum, The University of Tokyo, 6.RIKEN)

Keywords:cosmogenic nuclides, cosmic ray event

Cosmogenic nuclides such as 14C and 10Be are produced by incoming cosmic rays and therefore their concentrations in natural archive samples record the past cosmic ray intensities.

It has been reported rapid 14C increases in tree-rings for the periods AD 775, AD 994, 660 BC, 3371 BC and 5480 BC. Although it has been proposed that an origin of these events relates to solar energetic particles, information of production ratio between different nuclides are needed to determine the origin. As for the AD 775 and the AD 994 cosmic ray events, increments of concentrations in 14C (tree-rings), 10Be and 36Cl (ice cores) were detected, and it has been reported that the origin of the events is not contradictory to extreme Solar Proton Event.

In this presentation, we will report the results of quasi-annual 10Be measurements of ice core from Dome Fuji around ca. 660 BC.