The relationship between the oscillation of western Pacific warm pool and sea surface temperature anomalies in equatorial central and eastern Pacific

The anomalies of sea surface temperature(SST) in equatorial central and eastern Pacific are important indexes for the research of ENSO(El Ni?o-South Oscillation),. Based on the oceanic reanalysis, the relationship between the fluctuations of the water(T≥28℃) of the western Pacific pool(WPWP) and SST anomalies in equatorial central and eastern Pacific was investigated with focus on the interannual variability of the three-dimensional WPWP water, and from the view of the evolution of three-dimensional distribution of the WPWP water preceding the emergence of SST anomalies in key Ni?o regions and its important role in controlling the pattern of mass and heat in upper ocean, the intrinsic consistency among the anomalous changes in SST in equatorial central and eastern Pacific was probed into, which was expected to provide the new clue and basis for the mechanism and forecast of ENSO. The analysis suggests that the dominant pattern of spatio-temporal variation on ENSO time- scale as for three-dimensional WPWP water is the zonal oscillation with a zonal-averaged equilibrium line around 170 oE. At the same time, its remarkable characteristic is the formation of an anomalous double cantilever warm pool in the central and eastern tropical Pacific at the early stage(leading by around 6 months) of variations of SST anomalies in key Ni?o regions. The interannual zonal oscillation of the WPWP water is one of prerequisites for the anomalous changes of SST in key Ni?o regions. In virtue of the development of the anomalous warm pool with different intensity(generally refer to the volume of water and the magnitude of water depth and extent) in central and eastern Pacific which favors the zonal reconfiguration of the mass and heat in the upper ocean, the WPWP zonal oscillation is very likely to play decisive role as a original driver in the ocean to trigger the different EI Nino events, namely, that there is a sense in which the different flavors of ENSO events are to a great extent homeomorphous.