*Toshifumi Koseki1, Mamoru Koarai2 (1.Graduate school of Science and Technology, Ibaraki University, 2.earth science course, college of sciense, Ibaraki University)
convener:Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Yusuke Yokoyama(Atmosphere and Ocean Research Institute, University of Tokyo), Koji Okumura(Graduate School of Letters, Hiroshima University), Yasufumi Satoguchi(Lake Biwa Museum)