[A-CC32_29PM1] Past environmental changes through ice core studies

★ [ACC32-06] A long-term ¹⁰Be record from Dome Fuji ice core and cosmic-ray stratigraphy

*Kazuho HORIUCHI¹, Shota SUGUCHI¹, Kensuke SUDA¹, Tomoko UCHIDA², Takahiro AZE³, Yusuke YOKOYAMA⁴, Yasuyuki MURAMATSU⁵, Hiroyuki MATSUZAKI⁶, Hideaki MOTOYAMA⁷ (1.Graduate School of Science and Technology, Hirosaki University, 2.Institute of Geology and Paleontology, Tohoku University, 3.Graduate School of Science and Engineering, Tokyo Institute of Technology, 4.Atmosphere and Ocean Research Institute, The University of Tokyo, 5.Faculty of Science, Gakushuin University, 6.Graduate School of Engineering, The University of Toky, 7.National Institute of Polar Research)

Cosmogenic nuclides (¹⁰Be, ¹⁴C, ²⁶Al, ³⁶Cl) in paleoenvironmental archives serve as a proxy indicator of the paleointensity of cosmic ray, controlled largely by the strength of the solar/geomagnetic fields. Here, we present a millennial record of cosmogenic ¹⁰Be covering the past 300 kyr and obtained from ice cores drilled at the Dome Fuji station (77^o19'S, 39^o42'E), inland East Antarctica. A number of specific increases in ¹⁰Be were observed in this record and were connected semi-quantitatively to those in the cosmic-ray intensity caused by geomagnetic excursions during the last 300 kyr. These features can be used as stratigraphic time-markers for synchronization of not only Antarctic ice cores but also various paleoenvironmental archives such as deep-sea sediments