The silence from Gore and the criminal liberal media is deafening.........[/QUOTE]
Like this guy said, cheap publicity stunt:
[Quote=]Following on from this post, I emailed J Scott Armstrong, he pointed me to this web site/blog and the bet is outlined in more detail in this post.
At a glance, he is using the most obvious and trivial trick, that he appeared to have ruled out with his talk of forecasting climate change on this page. In fact, the terms of his challenge refer to forecasting annual mean temperatures at a handful of points, using raw model output. The trivial trick here is that of course the models do not directly represent local temperature (typical resolution is ~300km horizontally) and they also have significant regional biases, so meaningfully relating their output to local temperature requires at a minimum some sort of bias correction and/or downscaling. Such bias adjustment is an entirely routine procedure in many branches of forecasting, it is inconceivable that Armstrong does not realise this.
The other big problem is the time scale: the bet is for 1-10 year forecasts. While there are probably some people who can produce usable forecasts over at least the seasonal to annual time scale (and maybe further in some cases), on the whole these aren't the same people as those doing 100 year projections. The GCMs used in the IPCC report don't have any proper initialisation scheme that would enable them to make meaningful annual forecasts, and no-one has ever claimed that they do. From their point of view, whether one year is warmer than the last is basically a matter of chance, and a "persistence" forecast is a pretty reasonable reasonable choice.
A much fairer test of the models would be to look at something like a 20 year trend for global mean temperature (and possibly at a more regional scale: I haven't looked in detail at this). Armstrong claims to be amenable to altering his terms: I've emailed him with these points and will report on his response. Based on what I have read, I'm not optimistic. It reads like a cheap publicity stunt rather than serious challenge.[/Quote]