关键词: 风寒温度, 分布特征, 变化趋势, 冬季

Abstract:

The wind-chill temperature (WCT) indicates comfort and the risk of frostbite from different combinations of temperature and wind speed, which directly affects the safety and experience of snow sports. According to the meteorological service demand of the 2022 Winter Olympic Games, the winter observation data of 21 meteorological stations in Yanqing area were used to study the temporal and spatial change trend of the WCT. The results are as follows: (1) The high WCT zone was in the Yanqing basin area, and the low value zone was in the high altitude area such as Jinyun Hill, both with a risk of moderate frostbite. (2) The average temperature of Foyeding station in winter was -15.1 ℃, the extreme WCT reached -49.4 ℃, and the risk level of frostbite exposure was from the moderate to severe. (3) The daily change of WCT presented a single-peak and a single-valley distribution, and the lowest value of that appeared in middle and late January in the monthly change while the highest occurred in late February. (4) During the typical cold wave weather of January 5, 2010 and January 23, 2016, there were significant differences in the causes of the extremely low value of WCT. The former was dominated by temperature, while the latter by wind speed. (5) During the period from 1978 to 2016, due to the significant increase in temperature in Yanqing station, WCT had a significant upward trend. The temperature increase of Foyeding station was small, but due to the significant decrease of wind speed, the WCT also had a significant upward trend.

Key words: wind chill temperature, spatial-temporal characteristics, change trend, winter