辽宁夏季降水变化特征分析

Analysis of the Variation Characteristic of Summer Precipitation in Liaoning Province

利用辽宁56个测站的1951-2005年逐年和夏季（6—8月）逐日降水资料，采用常规统计分析、Morlet小波分析、Mann—Kendall突变检测法等统计分析方法，对辽宁夏季降水的基本特征进行了分析。结果表明：辽宁夏季降水存在2～3a、3～5a、10～12a等周期振荡，呈波动减少趋势；辽宁暴雨、大暴雨日数空间分布极不均匀。

Based on daily precipitation in summer （from June to August） and annual precipitation data in 56 observation stations from 1951 to 2005 in Liaoning province, the principal character of summer precipitation was analyzed in Liaoning province with routine statistical analysis, Morlet wavelet analysis and Mann- Kendall break detector. It could be concluded that the summer precipitation was a trend of fluctuant decrease with 2 - 3, 3 - 5 and 10 - 12 years periodic oscillation. The spatial distributions of rainstorm and heavy rainstorm are highly asymmetrical.