*Ryo Matsumoto¹, Hitoshi Tomaru¹, Yoshitaka Kakuwa¹, Glen Snyder¹, Akihiro Hiruta¹, Yoshihiro Kakizaki¹, Tsai-Luen Yu³, Chuan-Chou Shen³, Fumio Akiba⁴, Takeshi Oi¹, Naoto Ishida⁵, Shinsuke Aoki¹, Alexander Derkachev², Renat Shakirov², Anatoly Obzhirov² (1.Meiji University, 2.Pacific Oceanological Institute, FEB RAS, 3.HISPAC Dept of Geosciences National Taiwan University, 4.Diatom Minilaboratory, 5.Tottori University)

*Glen Snyder¹, Naizhong Zhang², Stephen Bowden⁵, Yoshihiro Kakizaki³, Naoto Takahata⁴, Kentaro Tanaka⁴, Yuji Sano⁴, Ryo Matsumoto¹ (1.Gas Hydrate Research Lab, Meiji Univeristy, 2.Earth-Life Science Institute, Tokyo Institute of Technology, 3.Dept. Earth and Planetary Sci., Univ. Tokyo, 4.Atmophere and Ocean Research Institute, Univ. Tokyo, 5.School of Geosciences, Univ. Aberdeen, Scotland)

*Musashi Yokoyama¹, Hitoshi Tomaru¹, Ryo Matsumoto², Glen Snyder², A.V. Yatsuk³, Shvalov D.A.³ (1.Chiba University, 2.Meiji University, 3.Gas Geochemistry Laboratory, V.I.Ilichev Pacific Oceanological Institude)