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

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

作　　者：LIAODechun ZHOUYonghong LIAOXinhao 

机构地区：[1]ShanghaiAstronomicalObservatory,ChineseAcademyofSciences,Shanghai200030,China [2]NationalAstronomicalObservatories,ChineseAcademyofSciences,Beijing100012,China [3]UnitedCenterforAstro-GeodynamicsResearch,ChineseAcademyofSciences,Shanghai200030,China

出　　处：《Chinese Science Bulletin》2003年第16期1709-1713,共5页

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).

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.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.

关 键 词：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 

分 类 号：P732[天文地球—海洋科学]