*Zul Hilmi Saidin¹, Yuichi Onda², Hiroaki Kato², Momo Kurihara², Kazuki Nanko³, Delphis F. Levia⁴ (1.Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan, 2.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, Tsukuba, Ibaraki, Japan, 3.Department of Disaster Prevention, Meteorology and Hydrology, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki, Japan, 4.Departments of Geography, University of Delaware, Newark, Delaware, USA)

*Hiroaki Kato¹, Yuichi Onda¹, Zul Hilmi Saidin¹, Momo Kurihara¹, Tomoki Shinozuka², Satoru Akaiwa² (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 2.College of Geoscience, School of Life and Environmental Sciences, University of Tsukuba)