辽宁雷暴时空分布特征分析

利用近几十年来统计的辽宁各站资料,对辽宁省各地雷暴日数的时间、空间分布和变化进行了分析,结果表明,全年平均雷暴日数辽东山区、辽北和朝阳地区较多,达30 d以上,其他地区多在30 d或以下,大连较少,仅19 d;雷暴集中出现在6～9月,占年雷暴日数的75%以上;近50年辽宁年平均雷暴日数呈略减少趋势,减少趋势为1 d/10a;从雷暴日数的空间变化来看,从东部、西部、北部向中部、南部递减。辽宁西北部、东部和北部年均雷暴日数最多,辽宁中部次之,南部沿海地区的雷暴日数最少。

Analysis of Temporal and Spatial Characteristics of Liaoning Thunderstorms

By using statistical information of various stations in Liaoning in recent decades,the spatial-temporal distribution and variation of thunderstorm in Liaoning Province were analyzed.The results showed that： the average annual number of thunderstorm days in eastern mountainous,northern part of Liaoning and Chaoyang are up to 30 days or more,other regions have 30 days or less,Dalian has only 19 days.Thunderstorms concentrated in June to September,accounting for annual thunderstorm days 75% or more;the average annual number of thunderstorm days in Liaoning in recent 50 years was slightly decreasing,reducing one day per ten years;from the spatial variation of thunderstorm days,it decreases from the east,west,north to the central and south.The average annual number of thunderstorm days in the northwest,east and north are the most in Liaoning,followed by central,the thunderstorm days in southern coastal areas is the least of all.