Impact of Pacific Decadal Oscillation on Frequency Asymmetry of El Nio and La Nia Events

正El Nio–Southern Oscillation(ENSO)is an abnormal sea surface warming or cooling phenomenon over the tropical Pacific,which also has severe global impact.Interestingly,ENSO characteristics are changing with climate change(e.g.,Collins et al.,2010).Therefore,it is expected that ENSO can be modulated on the decadal time scale,particularly when the tropical climate background state is fluctuating strongly

Impact of Pacific Decadal Oscillation on Frequency Asymmetry of El Niño and La Niña Events