*Shota Amekawa¹, Akihiro Kano¹, Kenji Kashiwagi², Taiki Mori³, Fumito Shiraishi⁴, Chuan-Chou Shen^5,6,7 (1.Graduate School of Science, The University of Tokyo, 2.Department of Environmental Biology and Chemistry, Faculty of Science, University of Toyama, 3.Graduate School of Integrated Sciences for Global Society, Kyushu University, 4.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 5.High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, National Taiwan University, 6.Global Change Research Center, National Taiwan University, 7.Research Center for Future Earth, National Taiwan University)

*Fumito Shiraishi¹, Takayuki Akimoto¹, Naotaka Tomioka², Satoko Motai², Yoshio Takahashi³ (1.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 2.Kochi Institute for Core Sample Research, JAMSTEC, 3.Department of Earth and Planetary Science, The University of Tokyo)