I posted this to the discussion on El Nino blog post 6.
Ludescher et al 2014 now claims their method works 1 year in advance. Can somebody get this paper?
I don’t think I’ve seen:
Ludescher, J., Gozolchiani, A., Bogachev, M. I., Bunde, A., Havlin, S., and Schellnhuber, H. J. (2014). Very Early Warning of Next El Niño, PNAS 111, 2064 (doi/10.1073/pnas.1323058111)
Abstract The most important driver of climate variability is the El Niño Southern Oscillation, which can trigger disasters in various parts of the globe. Despite its importance, conventional forecasting is still limited to 6 mo ahead. Recently, we developed an approach based on network analysis, which allows projection of an El Niño event about 1 y ahead. Here we show that our method correctly predicted the absence of El Niño events in 2012 and 2013 and now announce that our approach indicated (in September 2013 already) the return of El Niño in late 2014 with a 3-in-4 likelihood. We also discuss the relevance of the next El Niño to the question of global warming and the present hiatus in the global mean surface temperature.
I see no reason not to email one of the authors (who include H.J.Schnellhuber, founding director of PIK) with any questions or criticisms before publishing.