Once upon a time, in the mists of time (Feb 2008), long before climate scientists had “moved on”, realclimate featured a post entitled Antarctica is Cold? Yeah, We Knew That, in which Spencer Weart, as noted by Pielke Jr, observed: . . . we often hear people remarking that parts of Antarctica are getting colder, […]
Image by mark van de wouw via Flickr For discussion of new study. by Steig (Mann) et al 2009. Data: Data sets used in this study include the READER and AWS data from the British Antarctic Survey. SI Tables 1 and 2 provide listings. They leave out station identifications (a practice that “peer” reviewers, even […]
Mann said: Although 484 (~40%) pass the temperature screening process over the full (1850–1995) calibration interval, one would expect that no more than ~150 (13%) of the proxy series would pass the screening procedure described above by chance alone. Reader DC said: Of the 484 proxies passing the 1850-1995 significance test, 342 also passed both […]
In a recent CNN interview discussed at RC here, Joe D’Aleo said: Those global data sets are contaminated by the fact that two-thirds of the globe’s stations dropped out in 1990. Most of them rural and they performed no urban adjustment. And, Lou, you know, and the people in your studio know that if they […]
One of the ongoing Team mantras has been that the Mann hockey stick has been supported by a “dozen independent studies”. Obviously, I’ve disputed the claim that these studies are “independent” in any non-cargo cult use of the term “independent”. A new article by Jones and multiple coauthors (Holocene 2009) comments on this issue.
A blog article here reviews the “standing joke” of Mann’s stubbornness in refusing to correct the wrong locations of MBH98 in the recent Mann et al 2007 network, where, as I observed, the prior errors are perpetuated without apology, even though the incorrectness of the locations has long been known to Mann. In a routine […]
Earlier today, I reported that I had been unable to access their server using R even to get a tiny data set. (I haven’t been working on NASA GISS data and haven’t downloaded anything much from them for months.) The following simple script failed for me (and for Roman in New Brunswick, Canada), but, strangely […]
This is a very pretty example, though the problem is endemic as Mann et al 2008 uses Mannomatic methods for industrial strength voodoo correlations. This one came up from trying to replicate Mannian confidence intervals from original data – an effort which promptly foundered because my CPS emulation, which, after much effort, finally worked on […]
Anthony has a post reporting NOAA’s 2008 results, with NOAA reporting: For 2008, the average temperature of 53.0 degrees F was 0.2 degree above the 20th Century average. Anthony showed the following image from NOAA: Readers need to keep in mind that there is a substantial “divergence” between NOAA US and NASA US temperatures as […]
Ex post selection based on correlation has been a long-standing issue at this blog (and has been independently discussed at other blogs from time to time – Luboš, Jeff Id and David Stockwell have all written on it independently. The issue came back into focus with Mann 2008, in which there is industrial strength correlation […]
Climate Audit 