1956—2010年辽宁西部夏季降水的特征分析

Characteristics Analysis of Summer Precipitation in Western Liaoning Province During 1956—2010

该文利用1956—2010年辽宁省西部8个气象观测站6—8月的降水量资料,通过趋势分析、经验正交函数(EOF)分解、曼-肯德尔(Mann-Kendall)法和小波分析等多种统计方法,研究了辽宁西部自1956—2010年夏季降水的特征。结果表明:辽西地区夏季平均降水量的空间分布趋势为从南向北递减,时间分布上呈双峰型;平均夏季降水量呈下降的趋势,并且趋势不显著;夏季降水的分布主要呈南北差异型,降水异常以北少南多的分布特征为主,同时也存在降水异常东西反相的分布特征;降水存在10年尺度的显著震荡周期。

Based on the pret：ipitation datas of 8 stations in summer（fi＇om June to August）from 1956 to 2010（total of 55 years）in western Liauning Province, the method of tremt analysis, empirical orthogonal function （EOF）decomposition, Mann - Kendall mutation method and wavelet analysis were used to study the characteristics of summer precipitation in western Liaoning Province. The results showed that the spatial distribution of average summer precipitalion in western Liaoning Province decreased from south to north,and the time distribution was bimodal;average summer rainfall decreased ,and line trend was not significant ;the summer rainfall distribution was mainly north-south differences type ,and also sometimes west-east differem＇es type;the summer precipitation had a significant lOa-scale oscillation cycle.