云南雷暴的气候变化特征
Climate change of thunderstorm in Yunnan Province
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摘要: 利用云南113个常规气象站1961~2006年雷暴日数资料,采用旋转经验正交展开方法将云南划分为6个气候区域,并在此基础上对雷暴日数进行时空变化分析.结果表明:云南省雷暴自1961年以来呈现显著减少的趋势,且在1980s发生过一次显著减少的突变.从地域分布上看,各个区域的雷暴均呈减少趋势,其中以南部和西南部减少最显著.雷暴初日、终日均有提早趋势,而间隔日数则有加长的趋势,但均不能达到统计学意义上的显著水平.Abstract: By using the method of rotated empirical orthogonal function(REOF) and according to thunderstorm days data of 113 routine meteorological stations,Yunnan Province is partitioned into six regions and its spatial-temporal variation is analyzed.The results showed that the thunderstorm days in Yunnan Province had a descending trend during1961—2006,and thunderstorm days took place an abrupt occurred in1980s.For spatial-variation,all of various regions had descending trend,especially in Southern Southwestern Yunnan.Initial/ending dates of thunderstorm had ahead trends and the number of days between two dates had an increasingly trend,but don't attain marked levels of statistics.