I [Dan Hughes] posted a short discussion of some software Verification and Validation issues on another thread. Here are some additional thoughts. I have a few questions for anyone who have answers. I consider these issues to be essentially show-stoppers as far as use of the results of any of the AOLBCGCM codes and all […]
Michael E. Mann, 2006, Climate Over the Past Two Millennia, Annu. Rev. Earth Planet. Sci. 2007. 35:111–36 is online here , No signs so far of Mann, M.E. et al, Robustness of proxy-based climate field reconstruction methods, 2006 (accepted), which was cited by “Anonymous Referee #2” in the Burger-Cubasch review. Funding generously provided by NSF […]
A miracle has occurred. Osborn has provided identification of the sites used in the various Osborn and Briffa MXD studies. See his webpage here. He notified Craig Loehle and I today. These use various subsets of the large Schweingruber collection made in the late 1980s and early 1990s. They only cover the period after 1400, […]
I thought that some of you would be interested in a plot of Juckes’ Union proxies against gridcell temperatures. I’ll start off by simply showing a plot during the 1856-1980 calibration period (both scaled over 1856-1980), as below, followed by a plot of the residuals. The proxies are arranged according to longitude from California going […]
One point that Wahl and Ammann and ourselves agree on, but which Juckes appears to contest, is that principal components methodologies applied to AD1400 MBH98 networks result in upweighting or downweighting of bristlecones. Their Scenario 6 shows reconstruction results without bristlecones for covariance, correlation and Mannian PCs. I have no dispute with these calculations although […]
Here are some notes on my attempts to replicate Juckes’ CVM calculations, together with a script. I can replicate some reconstructions very closely – e.g. Esper and Jones within less than a tenth of a degree of the archived CVM, but other replications,including the Union reconstruction, are not as close. In each case, I checked […]
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 […]
Juckes and the Euro Team spent a lot of time on the topic of MM normalization, stating as follows (continuing the academic check kiting initiated by claims made in Wahl and Ammann (Clim Chq 2006) using the rejected Ammann and Wahl (GRL 2006)): Wahl and Ammann (2006) ascribe the difference between MM2005 and MBH1998 to […]
Juckes has much to say about several MM articles, none of it favorable and little of it accurate. Juckes, like the rest of the Team, seldom quotes our articles – instead, he typically paraphrases what we said, often creating a straw man, which he prefers to deal with. It’s a wearisome task disentangling the many […]
Does anyone think that Kerry Emanuel and Judith Curry each have an obligation to issue a report in Nature and/or Science on the 2006 hurricane season? Corporations can’t just issue financial statements when they have good years; they have to issue reports in bad years. And let there be no doubt – 2006 was a […]
Climate Audit 
New Mann Paper
Michael E. Mann, 2006, Climate Over the Past Two Millennia, Annu. Rev. Earth Planet. Sci. 2007. 35:111–36 is online here , No signs so far of Mann, M.E. et al, Robustness of proxy-based climate field reconstruction methods, 2006 (accepted), which was cited by “Anonymous Referee #2” in the Burger-Cubasch review. Funding generously provided by NSF […]