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Corresponding to the pronounced amplitude asymmetry for the central Pacific(CP)and eastern Pacific(EP)types of El Ni(n)o,an asymmetry in the strength of the Bjerknes positive feedback is found between these two types of El Ni(n)o,which is manifested as a weaker relationship between the zonal wind anomaly and the zonal gradient of sea surface temperature(SST)anomaly in the CP El Ni(n)o.