1. Graduate School of Environmental Science Hokkaido University Sapporo Japan
2. Institute of Low Temperature Science Hokkaido University Sapporo Japan
3. Meteorological Research Institute, Japan Meteorological Agency Tsukuba Japan
4. Arctic Research Center Hokkaido University Sapporo Japan
5. Kitami Institute of Technology Kitami Japan
6. Institute for the Advancement of Higher Education Hokkaido University Sapporo Japan
7. National Institute of Polar Research Tokyo Japan