论文部分内容阅读
用近百年观测资料分析了赤道印度洋海温（ＳＳＴ）变化，其偶极子型振荡的特征确实存在．这种偶极子型振荡在９～１１月最强，而在１～４月最弱；还表现出有年际变化和年代际变化．这个偶极子的正位相型（海温西高东低）一般强于其负位相型（海温东高西低）．尽管在极个别年赤道印度洋海温偶极子似乎独立于太平洋厄尔尼诺－南方涛动（ＥＮＳＯ）， 但总体而论，赤道印度洋海温偶极子与赤道太平洋海温偶极子（类似反ＥＮＳＯ模）有很好负相关．联系它们的主要物理过程主要是赤道大气纬向（Ｗａｌｋｅｒ）环流的异常．
Based on nearly one hundred years of observation data, the SST variation in the equatorial Indian Ocean is analyzed, and the dipole-type oscillation does exist. This dipole-type oscillation was the strongest in September-November and the weakest in January-April; it also showed interannual and interdecadal variations. The dipole’s orthophase (SSTWE) is generally stronger than its negative counterpart (SSTWSW). Although in a very few years the dip in the equatorial Indian Ocean seems to be independent of the Pacific El Niño-Southern Oscillation (ENSO), the equatorial Indian Ocean dipole and the equatorial Pacific dip dipole (similar to the anti-ENSO mode ) Have a very negative correlation. The main physical processes that connect them are mainly anomalies of the Walker circulation in the equatorial atmosphere.