毛乌素沙漠腹地乌审旗雷电活动特征

利用毛乌素沙漠腹地的乌审旗气象局1961—2010年地面观测资料对该地区的雷暴特征进行了分析。结果表明:乌审旗地区50a年平均雷暴日数为24.12d,雷暴日数变化气候趋势系数为-0.06。乌审旗3月开始出现雷暴,7月达到最高值,11月至翌年2月之间无雷暴发生,雷暴平均初日为4月29日,平均终日为9月25日。在80%的保证率下雷暴初日为4月9日,终日为10月8日。乌审旗雷暴多出现在下午,夜间次之,上午最少。雷暴出现的最多方位是西北和正西方向。

The Thunder and Lightning Activity Characteristics of Wushen Banner in Mu Us Desert Hinterland

Using the surface observation data of Wushen banner meteorological bureau from 1961 to 2010, the thunderstorm charac- teristics of Wushen banner were analyzed. The results showed that： the annual average days of thunderstorms was 24.1 days in the last 50 years. The climate trend coefficient of thunderstorm days variation was -0.06. The earlier thunderstorm occurred in March and reached the highest value in July, none in November to next February. The average first day of thunderstorm was in on April 29th and the average end day was on September 25th.Under the insurance rate of 80%, the first day of thunderstorms was in on April 9th and the end day was on October 8th.The thunderstorms of Wushen Banner mostly happened in the afternoon, followed by at night and at least in the morning. The mostly direction were northwest and west.