A weak El Nino event in 2002 detected by the astronomical observation

作     者：LIAODechun ZHOUYonghong LIAOXinhao 

作者机构：ShanghaiAstronomicalObservatoryChineseAcademyofSciencesShanghai200030China NationalAstronomicalObservatoriesChineseAcademyofSciencesBeijing100012China UnitedCenterforAstro-GeodynamicsResearchChineseAcademyofSciencesShanghai200030China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2003年第48卷第16期

页      面：1709-1713页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by the National Natural Science Foundation of China(NNSFC)(Grant Nos.10273018,10133010,19833030 and 19973011) Science and Technology Development Fund of Shanghai(Grant No.JC14012) 

主　　题：天文观测 现代空间技术 海洋表面温度 太平洋 微波分析 厄尔尼诺现象 海洋气候学 

摘      要：Using the length-of-day (LOD) data series de-rived from astronomical observations made by various mod-ern space techniques, southern oscillation index (SOI) and anomalies of sea surface temperature (SST) in tropical Pa-cific Ocean, the inter-annual components of these data series are obtained by the technique of band filtering from January 1962 to October 2002. It is found that a new ENSO event has already occurred in 2002 and been detected by the inter- annual LOD. It is shown by the wavelet analysis that the component with a period of about 46 years and the quasi-biennial component are out of phase during 2001 2002, which consequently suggests that the new ENSO event cannot be a strong one.