I think that Mann et al. are on the horns of an interesting dilemma on variance scaling (and there is no injustice in this.) MàÆàⵢerg et al. [2005], following von Storch et al. [2004], argue that the use of regression-based methods in MBH98/99 result in the lesser variability in the shaft of the hockey-stick. Here […]
Quelccaya accumulation are 2 of only 14 proxies in MBH99. I think that it was the very first Mann proxy series that I posted about (circa May 2003), as the underlying data looked very strange when plotted. Hans Erren has posted up an interesting analysis which both explains the strange appearance of the series as […]
If you google "moberg climate" under News, you get the Nature announcement – but look at the announcement and the avatar: Past climate comes into focus but warm forecast stays put Nature.com, UK – 4 hours ago – Fluctuations in global temperature during the past millennium may have been larger and more frequent than […]
We have focused considerable attention on the role of the Gaspé series in MBH98. While we alluded previously in MM05 (E&E) to information in our possession that the updated (1991) version of the series differed from the 1982 version and to our frustration that the updated version remains unarchived (see Jacoby #1) , we are […]
The bristlecone pine "adjustment" for CO2 fertilization in MBH99, while genuflecting to Graybill and Idso [1993], is completely different as seen in Figure 1 below.
I defer to Roy Spencer on the subject of why the Hockey Stick was taken so seriously and so completely (my emphasis in bold): The hockey stick, along with the “warmest in 1,000 years” argument, has become a central theme of debates over the Kyoto Protocol, a treaty to limit emissions of greenhouse gases, in […]
Mann et al. have recently argued that they can salvage MBH98-type results, even with correct PC calculations by also using “the standard selection rule (Preisendorfer’s Rule N) used by MBH98”. They say that this method permits them to retain 5 PCs in the North American network. The reason why this matters to them is that […]
Steve and I thought it would be a great idea to play a game of “Where’s Waldo?” Except that instead of finding a cartoon character on a page in a children’s book featuring lots of cartoon characters, we’d instead try to spot the “Mann Hockey Stick” hiding in news articles and scientific reports. Our first […]
There has been some recent chatline discussion on whether the MBH98 bristlecone pine series were “adjusted” for non-climatic factors. A number of posters seem to think that they were so “adjusted. For example, Tom Rees said on http://www.davidappell.com: on Monday, January 31st, Tom Rees said Me again… James: Mann et al 1999 seem to be […]
The Dunde (Himalayas) ice core is a staple of multiproxy studies (MBH98, Crowley and Lowery [2000], Yang et al [2002] used in Jones and Mann [2003], Jones and Mann [2004]). It was one of 4 series that contributed the only hockey-stick-ness to the results – see here . Although the core was taken over 17 […]
Climate Audit 