When Wahl and Ammann’s script first came out, I was able to immediately reconcile our results to theirs – see here. As Wegman later said: when using the same proxies as and the same methodology as MM, Wahl and Ammann essentially reproduce the MM curves. Thus, far from disproving the MM work, they reinforce the […]
In a previous post, I’ve observed some oddities in connection with the dating of Wahl and Ammann 2007 and with Schneider’s obfuscation when asked to explain how an article supposedly accepted on March 1, 2006 could cite an article that had not even been submitted until August 2006. (BTW, I note that Journal of Climate […]
Last summer, on Aug 28, 2007, I wrote a post observing that Wahl and Ammann 2007, although being cited in IPCC AR4, had still not appeared in print. I think that it was then the only article cited in IPCC AR4 chapter 6 in that situation. In that post, I observed that it seemed anomalous […]
One of the really annoying things about Wahl and Ammann was their failure to cite our prior analysis of various MBH permutations and, then, having failed to cite these prior analyses, reproaching us for supposedly “omitting” these analyses. For example, in MM05 (EE) we discussed the relative impact of using 2 or 5 covariance PC2 […]
Here’s a pretty little graph that I think that you’re going to see more of. One is using the Wahl-Ammann variation of MBH methodology applied to MBH data; the others are from low-order red noise. Pink – no PC reconstruction from WA without strip-bark and Gaspé; black – from low-order red noise. I worked this […]
I asked KNMI what were the studies that had “refuted” our work. It seems to be Wahl and Ammann. I’ve never understood the traction of Wahl and Ammann with climate scientists. I doubt that any of them have worked through the details, but Wahl and Ammann issued a press release that all our claims were […]
I’m posting up our July 2005 review of Wahl and Ammann. The recently accepted version is here. I’m posting this up for a variety of reasons. Mann relied heavily on Wahl and Ammann in his NAS panel testimony (which wasn’t even online as accepted last week) and so it’s hard to finish off the discussion […]
Mann cited Wahl and Ammann’s recently released paper at NAS (which was not available to us in time for the NAS panel, although I’d seen and reviewed an earlier draft.) After reading it, Per said that he thought that the reviewers had done a lousy job. Now I was only a reviewer for the first […]
I’ve just been informed that a new paper is ‘in press’ snappily called "Testing the Fidelity of Methods used in Proxy-based Reconstructions of Past Climate", by Mann M.E., Rutherford S., Wahl E., Ammann C. It is due to be published in "Journal of Climate". If anyone can get a copy of this paper, then let […]
I’m now completely file compatible with Wahl and Ammann. In terms of my algorithm, I had to tweak the procedure for scaling RPCs a little, but the RPCs themselves were identical. It took some patience to reconcile differing data setups. I archived results from a complete run-through from their base case a couple of days […]
Climate Audit 