1961—2011年通辽市极端降水事件特征分析

Analysis on Extreme Precipitation Event in Tong Liao from 1961 to 2011

文章利用通辽市9个气象站1961—2011年逐日降水资料,采用百分位值法定义了极端降水事件的阈值,统计了极端降水事件的频次,分析其空间分布特征和时间趋势变化。结果表明,通辽市极端降水事件阈值的空间特征是由南向北总体上呈高—低—高的分布特征,而极端降水事件频次空间差异较小,都在3.4d/a左右。1961—2011年,通辽市极端降水事件的发生频次呈减少趋势,减幅为0.23d/10a,存在明显的年代际差异。

Based on daily precipitation data of 9 weather observation stations from 1961 to 2011, the threshold value of extreme precipitation event was defined with percentile value method, the frequency of extreme precipitation event was counted, the spatial distribution characteristics and time changing trends were analyzed. The results showed that the spatial characteristics of threshold value of extreme precipitation event was tall-low-tall from the south to the north, small differences in the frequencies, it＇s about 3.4d/a. Nearly 51 years, frequency of extreme precipitation events showed a trend of decline, the damping was 0.23d / 10a, and there was a significant interdecadal difference.