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《Oceanologia Et Limnologia Sinica》 2008-01
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ZONAL DISPLACEMENT OF THE WESTERN PACIFIC WARM POOL AND ITS EFFECTS ON ENSO

QI Qing-Hua~(1,3) ZHANG Qi-Long~(1,2) HOU Yi-Jun~1 (1.Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071;2.Key Lab of Ocean Dynamic Processes and Satellite Oceanography,StateOcean Administration,Hangzhou 310012;3.The Graduate School of the Chinese Academy of Sciences,Beijing 100049)  
Based on the SODA data,SST data,JEDAC data,and TAO data,an index for zonal displacement of the Western Pacific warm pool (WPWP) is introduced using weighted-mean method in this study.The variability of WPWP zonal displacement is analyzed using the Morlet wavelet transformation method,and the effect of WPWP zonal migration on ENSO is discussed using composite and correlation analyses.The results show that the eastern edge of the warm pool is of most striking interannual (2—7a) and interdecadal (10—16a) changes,and experienced a weak/strong regime shift pre- and after-1976.As for WPWP zonal displacement,the whole warm pool can be divided spatially into two parts,i.e.,upper and lower parts demarcated near 50m-depth.The extent of zonal displacement in upper warm pool is much more distinct than that in lower part,but the trends of interannual and interdecadal changes in them are largely identical.In interdecadal variation,WPWP zonal displacement responses well to the zonal current,and especially zonal wind stress,in the equatorial central Pacific,it has remarkable impact on the western equatorial Pacific heat content variation.The results of composite and correlation analyses reveal that WPWP zonal migration plays a direct role in the formation and development of ENSO. Furthermore,the eastward expansion of WPWP has the impact that enlarges the El Ni o events.
【Fund】: 国家自然科学重点基金项目,90411013号;; 卫星海洋环境动力学国家重点实验室(国家海洋局第二海洋研究所)开放研究基金项目,200601号
【CateGory Index】: P732
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