Pacific Decadal Oscillation

I just saw an interesting article about the Pacific Decadal Oscillation and the El Nino-La Nina cycle. If my understanding is correct the PDO is much like a longer wavelength version of El Nino/La Nina. The shorter El Nino waves are superimposed on the longer PDO waves:This could be good news for our water situation here in Australia. Though the PDO has been in the cold phase for a few years now