1999—2008年新疆雷暴活动特征分析

利用1999-2008年新疆地面气象站的雷暴观测资料，从雷暴日的年、季、月、日等方面分析新疆境内雷暴活动的时空分布特征，并针对南、北疆的气候差异对比分析了雷暴活动特征的异同。结果表明：1999-2008年新疆年雷暴日数存在小幅波动，雷暴主要发生在每年的4-10月，每天的17-20时。雷暴活动存在一个沿天山南脉轴向为东北-西南向的带状高发区；南疆雷暴日数的年变化波动较北疆明显；夏、秋季南疆的雷暴日数多于北疆，尤其是秋季。

Characteristics of Thunderstorms Activity During 1999-2008 in Xinjiang

According to the thunderstorms observation data during 1999 to 2008, spatial and temporal distribution of thunderstorms activity in Xinjiang was analyzed, and the thunderstorms which occurred in southern Xinjiang were contrasted with that in northern Xinjiang to obtain similarities and differences.The results show that annual thunderstorm days had small scale of fluctuation during 1999 to 2008 in Xinjiang. Thunderstorms mainly occurred at 17 to 20 pm from April to October every year. There was an obvious northeast to southwest thunderstorm zone along the southern Tianshan Mountains. The fluctuation of annual thunderstorm days was more significant in southern Xinjiang than in northern Xinjiang. The number of thunderstorm days in southern Xinjiang was obviously larger than that in northern Xinjiang during summer to autumn, particularly in autumn.