Research of annual cosmic ray events using 10Be in the Dome Fuji ice core

Fusa Miyake; Kimiaki Masuda; Kazuho Horiuchi; Hideaki Motoyama; Hiroyuki Matsuzaki; Yuko MOTIZUKI; Kazuya Takahashi; Yoichi Nakai

Presentation information

Oral

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

[A-CC21] Ice cores and past environmental changes

Wed. May 25, 2016 10:45 AM - 12:15 PM 102 (1F)

Convener:*Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Nozomu Takeuchi(Chiba University), Ayako Abe-Ouchi(Atmosphere and Ocean Research Institute, The University of Tokyo), Ikumi Oyabu(National Institute of Polar Research, Research Organization of Information and Systems), Chair:Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Ikumi Oyabu(National Institute of Polar Research, Research Organization of Information and Systems)

11:15 AM - 11:30 AM

[ACC21-09] Research of annual cosmic ray events using 10Be in the Dome Fuji ice core

*Fusa Miyake¹, Kimiaki Masuda¹, Kazuho Horiuchi², Hideaki Motoyama³, Hiroyuki Matsuzaki⁴, Yuko MOTIZUKI⁵, Kazuya Takahashi⁵, Yoichi Nakai⁵ (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Graduate School of Science and Technology, Hirosaki University, 3.National Institute of Polar Research, 4.MALT, University Museum, University of Tokyo, 5.RIKEN)

Keywords:cosmogenic nuclide, annual cosmic ray event

Cosmogenic nuclides, 14C and 10Be, are produced in the atmosphere by cosmic rays from ourside the Earth. Carbon-14 is stored in tree-rings, and beryllium-10 is stored in ice sheets. Then, we can investigate past cosmic ray intensities by analyzing concentrations of 14C or 10Be. Annual cosmic ray increase events (AD 775 and AD993 or AD994) were found in 14C data of tree-rings. These events were also shown in quasi-annual 10Be data in the ice cores from the Antarctica and the Greenlands. We analyzed quasi-annual 10Be concentration in the Dome Fuji ice core, and detected the cosmic ray events. In this presentaion, we will report the results of quasi-annual 10Be measurments, and discuss a comparison with 14C data.