热带西太平洋纬向风的变化特征及其与埃尔尼诺的关系

THE CHARACTERISTICS OF LATITUDICALWINDS VARIATIONS OVER THE WESTERNTROPICAL PACIFIC AND THEIRRELATIONS WITH THE EL NINO

本文以热带西太平洋7个岛屿测站为代表,分析了热带西太平洋纬向风的年际变化特征及其与埃尔尼诺的关系。 结果表明,在埃尔尼诺南方涛动现象发生前后,热带西太平洋低、高层纬向风具有不同的特征,低层纬向风与滞后1～6个月的南方涛动指数呈明显的负相关。该地区纬向风异常在太平洋低纬地区海气相互作用过程中可能起着重要的作用。

In this paper ,seven observation stations on the islands (i.e.Koror.Yap .Guam, Truk,Ponape,Kwajalein and Majuro)were taken as representive ones in the western tropical Pacific .and the characteristics of latitudical winds variations over this region and their relations with the EL Nino were analysed . The results show that during per-EL Nino and post -EL Nino periods ,the latitudical wind anomalies in the upper and lower layer have different features The latitudical wind anomaly in the lower layer has a greater negative correlation to SOI with lags of 1-6 months.From statistical analysis,the anomaly of latitudical wind over this region was discussed and the anomaly may give a great influence on the process of air -sea interaction in the lower latitudes of the Pacific.