Pat Frank thought that I was being a little sarcastic of the rigors of updating tree ring collections at Niwot Ridge. However, I’d like now to give what is perhaps a better example of what Mann had in mind when he explained the inability of paleoclimatologists to update tree ring collections. Just to review, here’s […]
Graumlich [1991] argued that it was “difficult” to compare the results of Lamarche et al [1984] and Graybill [1987] to Kienast and Luxmoore [1988] results, because 15 of 16 Lamarche-Graybill sites came from above 2800 m, while 30 of 34 Kienast and Luxmoore sites came from below 2000 m. While this is true, the two […]
A common theme to recent questions has been the relationship of ring width chronologies to temperatures, and, in particular, the relationship of bristlecone chronologies to temperature. Rob Wilson has recently weighed in on this. While it was nice of Rob to present some new material, people should not lose sight of the fact that the […]
Rob Wilson sent in a post on another thread arguing that bristlecones are not as bad a proxy as I would have everyone believe. Unlike realclimate, opposing views are not censored here. In fact, I’m happy to highlight them. I’ll read Rob’s note and reply on an another occasion. I’ll only note now that, in […]
In February 2006, Luckman and Wilson archived their STD chronology for the Athabasca Glacier, Alberta site (STD fits each tree individually; RCS fits trees in groups.) Rob Wilson wrote in criticizing an earlier post for, among other things, not showing their STD version and for how I implemented the RCS emulation for Esper et al […]
There are 3 different versions of the Alberta site that have been applied in multiproxy reconstructions: 1) Luckman et al [1997] used in Jones et al [1998]; Crowley and Lowery [2000]; Briffa [2000]; 2) Esper et al. [2002] ; 3) the version used in Osborn and Briffa [2006], presumably from Luckman and Wilson [2005] and […]
Here is some more analysis based on the Esper measurement data sent to me by Science on March 16, 2005 — this time on the “Athabasca” site, which refers to a location in the Rocky Mountains, Alberta near the Athabasca Glacier. This note is rather a status report, so that I keep track of what […]
Last Friday, Science sent me measurement data used at 10 Esper sites — thanks to Science for this. Measurement data for 4 important sites (the Boreal and Upperwright foxtail sites; Polar Urals and Mongolia) were not sent. Hanson of Science commented that the Polar Urals site and some of the sites that he checked were […]
This post got deleted in the server crash. I typically post up from written text, but usually do a final edit as I input onto the blog, so the present note will probably differ a little from what I posted up yesterday, but probably not materially. Mann did not present anything germane that had not […]
Reader Bart S. has argued that Cook et al [QSR 2004] disposed of the "Divergence Problem", the name applied at the NAS panel on March 2-3, 2006 for the problem that, if the proxies do not record late 20th century warming, how can we be sure that they recorded potential earlier warming in the MWP. […]
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