1. National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
2. Transdisciplinary Research Integration Center, 2nd Floor, Kamiyacho Central Place Building, 4-3-13 Toranomon, Minato-ku, Tokyo 105-0001, Japan
3. Graduate School of Environmental Studies, Nagoya University, F3-1(200) Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
4. Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
5. International Research Center for Japanese Studies, 3-2 Oeyama-cho, Goryo, Nishikyo-ku, Kyoto 610-1192, Japan
6. Department of Geography, College of Mines and Earth Resources, P.O. Box 443025, University of Idaho, Moscow, Idaho 83844-3025, U.S.A
7. National Institutes for the Humanities, 2nd Floor, Kamiyacho Central Place Building, 4-3-13 Toranomon, Minato-ku, Tokyo 105-0001, Japan