崇礼赛区地形影响降水特征分析

Analysis of the Relationship between Terrain Factors and Precipitation in Chongli

利用崇礼赛区4个气象观测站点地面气象资料、微波辐射计资料、NCEP再分析资料和赛区地形资料等,分析了赛区地形对降水的影响。结果表明,引起崇礼赛区降水的天气类型有低涡型、低槽冷锋型和西北气流型;降水次数、总降水量、降水增加率和小时最大降水量均随海拔高度升高而增加;西北气流型降水地形抬升能力最强为23.9%,低涡型降水量地形抬升能力最弱为6.5%;云顶3号站在低涡型和西北气流型中地形抬升能力强于越野3号站,西南气流型两者相近;地形抬升降水量云顶3号站均大于越野3号站。

Based on the ground automatic weather station data with high temporal and spatial resolution,microwave radiometer sounding data,NCEP reanalysis data and the terrain data,the impact of terrain on precipitation was analyzed in Chongli competition zone of Beijing 2022 Winter Olympics and Paralympics.The conclusions are as follows.The precipitation patterns in Chongli competition zone include low vortex,low trough-cold front and northwest airflow.The frequency,amount of precipitation,precipitation increase rate and maximum hourly precipitation show increases with the increase of the altitude.Terrain lifting in the pattern of northwest airflow is the strongest,causing 23.9%of the precipitation.While for the pattern of low vortex precipitation,terrain lifting contributes the lowest,about 6.5%.For the precipitation caused by low vortex and northwest airflow,Genting NO.3 station experienced more terrain-related precipitation than Cross-country NO.3 station.For the precipitation caused by southwest airflow,both station have nearly the same amount of terrain related precipitation.The uplift capacity of terrain Genting NO.3 is larger than that of cross-country NO.3.