convener:Daisuke Tsumune(University of Tsukuba), Naofumi Akata(Hirosaki University), Hiroaki Kato(Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba), Shigeyoshi Otosaka(Atmosphere and Ocean Research Institute, The University of Tokyo), Chairperson:Hiroaki Kato(Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba), Naofumi Akata(Hirosaki University)