新疆北部沿天山经济带雷暴气候特征

Climate Characteristics of Thunderstorms in the Economic Belt along Tianshan Mountains of Northern Xinjiang

利用新疆北部沿天山主要经济区内16个站点1979—2008年雷暴日数、温度及降水资料,分析了雷暴活动的时空分布特征,包括雷暴变化趋势和振荡周期。结果表明:在全球变暖背景下,30 a来北疆沿天山主要经济带西部区域的雷暴持续期缓慢延长,年雷暴日数在波动中减少。雷暴日数自西向东递减,西部区域年雷暴日数相对东部区域变幅较大。年降水量与年平均雷暴日没有明显的相关性;年平均温度与雷暴日有负相关。小波分析显示新疆北部沿天山主要经济带的东部和西部均具有明显的16a左右周期波动。

By using of the thunderstorms data from 16 sites in the main economic zone along Tianshan Mountain of northern Xinjiang,we analyzed the characteristics of temporal and spatial distribution of thunderstorm activities,including the thunderstorm changing trends and oscillation periods.The results show that under the global warming background,in the west part of the major economic zones,the thunderstorm duration is going up slowly,and the mean annual thunderstorm days decrease with fluctuation.The spatial distribution trend of thunderstorms from west part to east is generally decreasing.The west part present more thunderstorm days than that in east part,and thunderstorm days in the western region changes is larger relative to the east part.There is no obvious correlation between annual precipitation and mean annual thunderstorm days;moreover mean annual temperature and mean annual thunderstorm days have a negative correlation.Wavelet analysis showed that both of the east and west part of the main economic belt have obvious periodical fluctuation around 16 years.