I wrote recently on the bizarre spaghetti graph from Guliya – where three inconsistent versions have been used in 2006 articles. I think that I may have a good first step at decoding this mess, as illustrated in the comparison below of the PNAS 2006, Climatic Change 2004 and Yang 2002 versions (used again in […]
I’ve written on several occasions about Juckes’ use of cold water G Bulloides as a supposed temperature proxy (following Moberg’s equally indefensible use of this proxy.) It has come to my attention that a leading specialist, David Black of the University of Akron, had already issued a scathing denunciation of Juckes’ use of G Bulloides […]
While we’re re-visiting bristlecones and foxtails, here are three interesting online articles, each of which discusses areas in the Sierra Nevada CA, which are now submerged, but where forests grew in the Medieval Warm Period. Many readers of this blog will have read articles about trees being disgorged from receding glaciers and it’s hard not […]
Constance Millar, url who wrote an excellent article on the medieval warm period in California, discussed here has written an interesting and timely article (presently in review) on thelate 20th century in the Sierra Nevadas, entitled: Response of high-elevation limber pine (Pinus flexilis) to multi-year droughts and 20th-century warming; Sierra Nevada, California.
Juckes stated: MM2003 criticise MBH1998 on many counts, some related to deficiencies in the description of the data used and possible irregularities in the data itself. These issues have been largely resolved in Mann et al. (2004) [the Corrigendum]. Did Juckes carry out any due diligence in order to make the latter statement? Because I’m […]
In MM05 (EE), we reviewed literature on bristlecones because these trees were supposed to be unique radio receivers for world temperature. Obviously the specialist literature stood against this proposition. We cited a number of interesting articles by Mooney in American Midland Naturalist in the 1960s – none of which are considered by Juckes in his […]
Wahl and Ammann 2006 reported that they could “get” something that was sort of HS-ish without principal component analysis. It wasn’t through a simple mean or CVM; it was through Mannian inverse regression. Juckes et al shows many reconstructions using “inverse regression”, mentioning in his conclusions that inverse regression caused over-concentration on a few proxies. […]
As you can see from the plot of the Juckes’ proxies, the Yang composite is a very important contributor to the 20th century blade. The Yang Composite is a mainstay of recent Hockey Team reconstructions – its use in Team reconstructions began in Mann and Jones 2003 and was then “randomly selected” into Osborn and […]
When one looks at the plots of the various Juckes proxies against gridcell temperature, the possibility of spurious regression must come to mind. “Spurious regression” has been discussed on this blog from time to time and tries to provide a statistical framework for seemingly high correlations between unrelated series – things like Honduran births and […]
I’ve added a “page” – see left column – with links to various proxy data collations that I’ve archived here. I’ll try to archive some read scripts at some point.
Climate Audit 