As I was writing up my note on Ammann at AGU, I re-read Mann’s reply to Barton, which mentions "ammann" no fewer than 11 times, usually as an "independent" scientist confirming his results. I’ve collected the mentions here, which make for some merry reading. Then I’ll discuss exactly how "independent" Caspar Michael Ammann (should we […]
Continued from Ammann at AGU (#1). I’m going to give a fairly brief account of previous attempts to get the residual series and/or cross-validation R2 from Mann, including inquiries to Mann, N.S.F., through Nature, by Climatic Change, by Natuurwetenschap & Techniek and by the House Energy and Commerce Committee. As you will see, no one […]
Some of you are looking for digital versions of the multiproxy results. For convenience, here is a digital collation of major reconstructions used in spaghetti graphs. The collation text is here, and URLs to source data can be extracted from line items. It’s not been made user-friendly.
Ammann made a presentation at the same AGU session as me, spending a considerable amount of time criticizing us — though with nothing new to say that we haven’t already rebutted here and in print. There was time for one question (AGU is fanatical about schedules) and I was recognized. So here’s my question to […]
Regular correspondent David Stockwell has set up a new blog and has posted an interesting comment on Briffa, about which he says: Have become interested in checking out dendroclimatology from the ENM point of view – particularly evaluating the model used for functional responses of alpine trees to temperature. All studies in Briffa et al. […]
Raymond Pierrehumbert at realclimate has recently posted on climate sensitivity, citing Hegerl et al. [2003] approvingly. As less weight is being put on Hockey Team arguments, more weight is being put on these detection and attribution arguments. Maybe I’ll put a few inquiries out for data and methodology on these studies. For now, I’ll point […]
A reader has kindly sent in an Excel spreadsheet here digitizing two series in the Mann et al [EOS 2003] spaghetti graph. It definitely looks as though the Crowley and Lowery version is some sort of transposition of MBH99 (good spotting by Tim Lambert), which definitely enhances the supposed similarity between the two graphs. Jones […]
Here’s an interesting calculation showing remarkable coherence between multiproxy averages of red noise, when proxies are shared.
Von Storch et al. [2004] argued that the reduced variability of MBH and Jones et al [1998] was possibly due to the use of inverse regression. This hypothesis has received a fair of attention as a rival candidate for the microscopic honor of breaking the hockey stick. I obviously think that our analysis in terms […]
In response to the high-variability recosntruction of Esper et al. [2002] posted up here , Mann and Hughes [Science 296, 848 (2002)] replied: The basis used by Esper et al. for comparison with previous studies of NH temperature trends over the past millennium is flawed [imagine Mann calling someone else’s work "flawed"] … Some of […]
Climate Audit 
11 Ammann Mentions in Mann's Barton Letter
As I was writing up my note on Ammann at AGU, I re-read Mann’s reply to Barton, which mentions "ammann" no fewer than 11 times, usually as an "independent" scientist confirming his results. I’ve collected the mentions here, which make for some merry reading. Then I’ll discuss exactly how "independent" Caspar Michael Ammann (should we […]