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《Periodical of Ocean University of China》 2009-S1
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The Comparison Between EOF and Multi-Regression Method on the Fitting of Tropical SST

ZHONG Yi-Sen,ZHAI Fang-Guo(Ocean University of China,Qingdao 266100,China)  
Based on the tropical precipitation data,two methods EOF method and multi-regression method are compared in the fitting of SST.The result implies both of these two methods can make a good estimation on the East Pacific SST anomaly due to ENSO,but produce relatively large error on other areas.The comparison between these two model results shows that the first modes of SST and precipitation have 95% linear correlation,however,the skill of EOF method without high modes is not as good as multi-regression method which includes more modes.This presents the effect of high modes overwhelms the assumption of linear model.SVD composition is further used to analyze the correlation between modes of SST and precipitation,which also says that the second modes of SST and precipitation have similar spatial distribution.Therefore,introducing more modes is the main reason why multi-regression method does better than EOF method.
【Fund】: 国家重点基础研究发展计划项目(2005CB422302)资助
【CateGory Index】: P731.11
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