A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).


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Does the PDO drive global temps, and is there a Siberian connection?

This is a post for those who like the intellectual stimulation of unraveling the cause and effect links at the bleeding edge.  It’s a weekend puzzle.

Frank Lansner (of Hidethedecline) wants to toss out his latest thoughts and findings for discussion. With a very simple equation he’s managed to recreate a curve just like Hadcrut temperature profile, using just the Nino 3.4 data (see Fig. 1). If it stands up, this would imply the Pacific Decadal Oscillation (PDO) pretty much determined a significant part of the climate — which is not a shock, but nonetheless there’s not a lot of room for CO2. The turning points do seem to match well (unlike the temperature versus CO2 “turning points”). As William Kininmonth reminded us, the oceans cover 70% of the planet, and are 4km deep, and most of that water is very very cold, even under the equator. If the surface of the central pacific cools by 1 degree does that drop global temperatures by 0.1C?

Of course, the mystery of what drives the PDO still stands. On that score, Frank looks at Siberia and Alaska, and finds an interesting correlation with the Nino3.4 when it is lagged by 15 -18 months. [...]