*Michio Aoyama^1,2, Daisuke Sasano³, Yuichiro Kumamoto¹, Hiroshi Uchida¹ (1.Research Institue of Global Change, The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) , 2.Center for Research in Isotopes and Environmental Dynamic, Faculty of Life and Environmental Sciences, University of Tsukuba, 3.Atmosphere and Ocean Department, Japan Meteorological Agency)

*Michio Aoyama^1,2, Hideki Kaeriyama³, Daisuke Tsumune⁴ (1.Center for Research in Isotopes and Environmental Dynamic, Faculty of Life and Environmental Sciences, University of Tsukuba, 2.Institute of Environmental Radioactivity, Fukushima University, 3.Japan Fisheries Research and Education Agency, 4.Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry)

*Yayoi Inomata¹, Michio Aoyama² (1.Kanazawa University, Institute of Nature and Environmental Technology, 2.University of Tsukuba, Center for Research in Isotopes and Environmental Dynamics)

*Michio Aoyama¹, Naoko Otani¹, Yuichi Onda¹ (1.Center for Research in Isotopes and Environmental Dynamic, Faculty of Life and Environmental Sciences, University of Tsukuba)