*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)