*Reiko Ide¹, Ryotaro Okamoto^1,2, Keisuke Suzuki^3,4, Hiroaki Kawase⁵, Kenzo Kanda⁶, Hiroyuki Oguma¹ (1.National Institute for Environmental Studies, 2.University of Tsukuba, 3.Shinshu University, 4.Omachi Alpine Museum, 5.Meteorological Research Institute, 6.Nakaya Ukichiro Museum of Snow and Ice)