The authors thank Mr. Kenji Akaeda of Japan Meteorological Agency and Mr. Akira Yamamoto of Meteorological Research Institute for their support to the present observations and providing surface meteorological data at Kushiro Airport. The authors also thank the staff of Kushiro Airport Meteorological Observatory for their support for fog observations. We thank Dr. Gernot Hassenpflug for his careful reading of the original manuscript. The present study was financially supported by Grants-in-Aids (12740270) of the Japan Society for the Promotion of Science (JSPS).
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