*Yuta Sumiya¹, Mizuho Koike¹, Kento Onishi¹, Ai Kurokawa¹, Naoto Takahata², Hisashi Asanuma², Yuji Sano³ (1.Hiroshima University, 2.Atmosphere and Ocean Research Institute, The University of Tokyo, 3.Center for Advanced Marine Core Research, Kochi University)

*Glen Snyder^1,2, Naoto Takahata², Stephen Alan Bowden³, Naizhong Zhang⁴, Renat B. Shakirov⁵, Hitoshi Tomaru⁶, Fumito Shiraishi⁷, Yuji Sano⁸, Ryo Matsumoto¹ (1.Gas Hydrate Research Lab, Meiji Univeristy, 2.Atmosphere and Ocean Research Institute, University of Tokyo, 3.University of Aberdeen, 4.Earth-Life Science Institute, Tokyo Institute of Technology, 5.Pacific Oceanological Institute, 6.Chiba University, 7.Hiroshima University, 8.Kochi University)

*Yuji Sano¹, Teresa M Escobar², Naoto Takahata², Maoliang Zhang³, Daisuke Goto⁴, Daniele L Pinti⁵, Bernard Marty⁶ (1.Center for Advanced Marine Core Research, Kochi University , 2.Atmosphere and Ocean Research Institute, University of Tokyo, 3.Tianjin University, 4.National Institute of Polar Research, 5.University of Quebeck, Montreal, 6.University of Lorraine)

Jun Sakuma¹, Hisashi Asanuma², Naoto Takahata², *Tsuyoshi Iizuka¹ (1.Department of Earth and Planetary Science, The University of Tokyo, 2.Atmosphere and Ocean Research Institute, The University of Tokyo)

*Yama Tomonaga¹, Matthias S Brennwald¹, Edith Engelhardt¹, Stefanie B Wirth², Jin-Oh Park³, Juichiro Ashi³, Naoto Takahata³, Yuji Sano⁴, Rolf Kipfer¹ (1.Swiss Federal Institute of Aquatic Science and Technology, 2.University of Neuchâtel, 3.Atmosphere and Ocean Research Institute, The University of Tokyo, 4.Center for Advanced Marine Core Research, Kochi University)