厄尔尼诺现象对我国夏季降水的影响

Summer precipitation in China and ElNino

从我国各地降水资料的实际出发,利用48个测站尽可能长年代的降水资料和20世纪50年代以来的厄尔尼诺事件和反厄尔尼诺事件,分析了厄尔尼诺现象对我国夏季降水的影响。结果表明,在厄尔尼诺不同位相时,相同月份降水的分布情况不同;在同一位相下,每个月的降水分布也存在很大差异;各个月与整个夏季降水存在不同程度的差别。厄尔尼诺主要通过西太平洋副热带高压影响我国降水,但厄尔尼诺现象并不是决定我国夏季降水的惟一因素。

Based on the long-term precipitation series from 48 observation stations and the ElNino events and LaNina events having occurred since the 1950s in China, teleconnections between summer precipitation in China and ElNino/LaNina are analyzed. The results show that the significant differences can be observed in the total volume of monthly precipitation in summer between ElNino and LaNina events, while the differences can also be found in precipitation of different months in summer for ElNino or LaNina events, i.e. the relationships between the total summer precipitation volume and ElNino/LaNina events may not reflect the differences for a specific month, regarding to the spatial distribution of precipitation. The research further indicates that the teleconnections are associated with the western Pacific subtropical high, however, ElNino/LaNina is only one of the important factors dominating the summer precipitation variability in China.