西天山地区雷暴和闪电特征

利用西天山地区14个气象站1960-2010年雷暴资料和新疆雷电监测网2008年观测资料，分析了西天山地区雷暴和闪电变化特征。结果表明：西天山地区年平均雷暴日数分布呈东西多，南北少的形势。该区域年平均雷暴日数在17.3～85.5 d之间，并以2.7 d/10 a的速率减少。西天山地区雷暴日数的年变化呈单峰型，并在6-7月达到最大值。整个区域以正闪为主，正闪占总闪的比例达66%。该区域闪电电流强度在-130~+63 kA之间，负闪强度大于正闪强度。

Characteristics of Thunderstorm and Lightning in Western Tianshan Areas

The Characteristics of Thunderstorm and Lightning in Western Tianshan Areas were analyzed by use of thunderstorm data from 1960 to 2010 and lightning monitor data in 2008. The results showed as follows: The pattern of spatial distribution of thunderstorms in Western Tianshan areas was characterized by rare in the south and north but more in the east and west. The annual mean days of thunderstorm in Western Tianshan area was 17.3 to 85.5 days, and the thunderstorm days decreased at the rate of 2.7 days per decade in the recent 51 years. The monthly variation of thunderstorm average days shows single peak, and reached its peak in June and July. It is found that the ratio of positive lightning is 66% .The intensity of lightning is mainly concentrated in -130~ 63KA and intensity of negative lightning is greater than intensity of positive lightning.