《Table 1.Summary of the study sites.》

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《Observational Study of Surface Wind along a Sloping Surface over Mountainous Terrain during Winter》

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The study sites are the Yongpyong Alpine Center（Yo）and Alpensia Ski Jumping Center（Al）located in Pyeongchang.Table 1 summarizes the locations and names of the automatic weather stations（AWSs）at each site，and Fig.1a shows the topography of the Pyeongchang region，including the two study sites.High mountains are located to the north and south of the study sites.The mountains are approximately 1400 m high.Figures 1b and c show the detailed topography of the two study sites，respectively.The topographical maps were made using 30-m resolution terrain data from the Shuttle Radar Topographic Mission（SRTM；Reuter et al.，2007）.The Yo site is located on the northwest-facing slope；the upper two stations are located on the ridge and the lower two stations are located within the valley with low sidewalls.The mean slope angle of the ski slope is～23?.The surface elevation difference between the lowest and highest stations is～440 m.The wind at Y1 station（1414 m）represents synoptic wind at the ridge level in the Pyeongchang region.The western sidewall at station Y4 is parallel to a northeast–southwest axis，while the eastern sidewall is parallel to a northwest–southeast axis.The slope angle of the western sidewall is～20?and the half-hill height of the western sidewall is～130m.During the study period，the ski slope was covered with snow；however，the surrounding areas are covered with trees，and therefore significant solar heating occurs on the sloping surface during daytime.