*Takeshi Kinase1, Kazuyuki Kita2, Kumiko Goto-Azuma3,4, Yoshimi Ogawa3, Yutaka Kondo3,5, Moteki Nobuhiro5, Sho Ohata5, Tatsuhiro Mori5, Masahiko Hayashi6, Keiichiro Hara6, Masataka Shiobara3,4, hiroto kawashima7
(1.Graduate School of Science and Technology, Ibaraki University, 2.College of Science, Ibaraki University, 3.National Institute of Polar Research, 4.SOKENDAI(The Graduate University of Advanced Studies), 5.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 6.Department of Earth System Science, Faculty of Science, Fukuoka University, 7.Department of Management Science and Engineering, Faculty of Systems Science & Technology, Akita Prefectural University)