Given that I claim that my goal is to address what is said on Watts Up With That (WUWT), and not to simply criticise, I thought I would briefly highlight Willis Eschenbach’s recent post Congenital Cyclomania Redux. In this post, Willis talks about the work of Nicola Scafetta who seems to think that climate change is simply some kind of natural harmonic variation.
However, as Willis points out quite well, what Nicola Scafetta does is simply a curve fitting exercise. He attempts to model the variation in surface temperatures using a set of harmonic functions with different frequencies and amplitudes. What’s more he seems to increase the number of harmonics whenever he discovers that his previous model is no longer fitting particularly well, so he now has a large number of tunable parameters. As Willis quite rightly points out, it doesn’t even matter if the frequencies he uses are associated with something real (solar oscillations, planetary orbits) you still need a physical mechanism to explain how this can influence our climate.
Anyway, there you go. Admittedly I haven’t read Willis’s post in extensive detail but it does appear to be a WUWT post that I’m finding hard to criticise. The comments, on the other hand, are a slightly different story, but I’ll leave it at that.