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《科学通报(英文版)》 2003-16
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A weak El Nio event in 2002 detected by the astronomical observation

LIAO Dechun, ZHOU Yonghong & LIAO Xinhao Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China; United Center for As-tro-Geodynamics Research, Chinese Academy of Sciences, Shanghai 200030, China Correspondence should be addressed to Liao Dechun  
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.
【CateGory Index】: P732
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