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Predicting on coming EI-Nino Southern Oscillation (ENSO) changes has been a great challenging subject in ENSO study since the 1980s.One of the major difficulty in ENSO prediction is introduced by Spring Persistent Barrier (SPB).This sharing is going to introduce some known properties of the SPB, including some nature of SPB and its impact on different ENSO forecasting schemes.For dynamical model, some studies suggest that error in models ocean wind response may be the origin of SPB.For statistical model, SPB may be introduced by low autocorrelation of ENSO related parameters during and before spring.