I'm curious to know if the Inter-decadal Pacific Oscillation (IPO), with the approximate 30 year cycle of SST north and south of the equator are factored in. Goodwin (2005) established a link for the east coast of Australia between negative IPO and intensified La Nina events. This was evident through the negative period in the late 50's to early 70's of dramatic erosion events seemingly occurring one after another. As we move further into another negative phase, the East Coast Lows and East Coast Troughs appear to once again be intensified under La Nina conditions, though of course, it is hard to separate out the input due to general SST increases associated with climate change. Is it possible the negative IPO could be behind masking the approach of a La Nina by hiding/negating the cooler waters we would expect based on data collected over the 30 year positive IPO phase?