In my previous comment on Ritson’s AR1 calculation, I think that I correctly diagnosed that the calculation was goofy, but I didn’t diagnose what was going on correctly (thanks to Demetris Kousoyannis who emailed me). I’ve re-visited it and I’m pretty sure that I’ve now diagnosed the problem with what Ritson was doing. My starting […]
Just when you think that the MBH98 Little Shop of Horrors has been fully explored, something new turns up. I’ve never spent any time on the last part of MBH98, where he does a "detection and attribution" study linking his temperature reconstruction to solar, volcanic and CO2. All these detection and attribution studies (e.g. Hegerl) […]
I’ve posted up a little treat from the past – Enron’s climate change policy as downloaded in October 2002. I knew that Enron was favor of Kyoto before I knew of Michael Mann. In 1998, Enron received the Environmental Protection Agency’s (EPA) Climate Protection Award for its “exemplary efforts and achievements in protecting the global […]
A big story today is the guilty verdict on Enron executives Kenneth Lay and Jeffrey Skilling. There are many interesting issues involved in this, but the one that I wish to draw to attention of readers here is that Lay and Skilling were not found guilty of stealing money or looting the treasury, but of […]
The question for today is how does realclimate go from tree ring series with autocorrelation functions that look like the one in the figure below to a claim that these proxies have an AR1 coefficient of 0.15. We know that they are pranksters, but this looks like a good prank and it is. Autocorrelation Function […]
Ritson at realclimate did not thank me for helpful discussions on autocorrelation despite lengthy correspondence on my part with him. I thought that the histogram that I posted up earlier today looked familiar. So I looked back at my correspondence with Ritson (who posted up on autocorrelation at realclimate and sure enough, I’d sent the […]
realclimate today has a post How Red are My Proxies? which is so weird it’s worthy of Rasmus. (Note: see lsubsequent comment here). They discuss the autocorrelation properties of North American tree ring proxies, something about which I know a lot. They say: Using data from the North American network of seventy sets of tree […]
I’ve reported before that Science decided not to require Osborn and Briffa 2006 to provide supporting measurement data for their Taimyr, Tornetrask and “Polar Urals” (Yamal) chronologies. While I disagree with that decision and may pursue the matter further with them, I asked Osborn to voluntarily provide the measurement data. I received a reply from […]
Mann and Jones have a new post at realclimate discussing warmth at Svalbard, an island archipelago north of Norway. May temperatures are very warm there. They say that the differences are 5 standard deviations based in i.i.d. We’ve talked about the inappropriateness of i.i.d. assumptions in the context of Rasmus (BTW what ever happened to […]
The American Meteorological Society has recently placed all but their most articles online here. These include many important publications. Going from one extreme to another, the Tree Ring Society has also placed their archives online here,
Climate Audit 