Keiichiro Hara¹, Kazuo Osada², Masanori Yabuki³, Sumito Matoba⁴, Fumio Nakazawa⁵, Shuji Fujita⁶, Motohiro Hirabayashi⁷ and Takashi Yamanouchi⁶, (1)Fukuoka University, Fukuoka, Japan, (2)Nagoya Univ, Nagoya, Japan, (3)Kyoto University/RISH, Uji, Japan, (4)Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan, (5)NIPR National Institute of Polar Research, Tokyo, Japan, (6)Natl Inst Polar Research, Tokyo, Japan, (7)Nat''l Inst. of Polar Research, Tokyo, Japan