Abstract:

The meteorological station routine data, including the phase state of precipitation (rain or snow), surface temperature and surface relative humidity in Beijing and Zhangjiakou, were analyzed in order to investigate the proper conditions for snowmaking, and to evaluate the snowmaking hours. The results show that the precipitation phase state is closely dependent on surface relative humidity as well as surface air temperature, the relations of surface relative humidity to surface air temperature can be obtained at each weather stations by using the regression analysis. If considering to classify the precipitation phase state by temperature only, the snow frequency is above 95% among the stations within Zhangjiakou administrative area when the surface temperature is below-0.8℃, under the calculations of the temperature and occurrence frequency of different phase state of precipitation. The snowmaking hours of 2022 Winter Olympic Games were calculated by using the regional automatic weather station temperature near the field from 2014 to 2016. It’s found that the snowmaking hours is sufficient in Winter Olympic Games period, but insufficient in the Paralympic Games period, so the snowmaking and snow-storing are suggested in order to keep enough snow for the race.

Key words: Snowmaking, Surface air temperature, Relative humidity, Snowmaking hours, Beijing 2022 Olympic and Paralympic Winter Games