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Yearly Archives: 2009
Another Try on the Wall
May 11, 2009 – 6:23 AM
CA readers are well aware that Phil Jones of CRU has jealously refused to provide the surface temperature data set used in the prominent HadCRU temperature index, going so far as to repudiate Freedom of Information requests. Efforts to obtain this data have been chronicled here from time to time. As a result of the […]
Mannian Collation by Santer
May 9, 2009 – 10:41 AM
I reported a while ago on Santer’s refusal to provide the T2 and T2LT data as collated. Despite Santer’s rude refusal, PCMDI placed the data online anyway, notifying me that this had been their plan along. I reported on this at the time, but so far haven’t reported on the collated data. The T2 and […]
Trends using Maximum Likelihood
May 6, 2009 – 5:59 PM
For a seemingly simple topic, the calculation of trends and their confidence intervals has provoked a lot of commentary (see any number of threads at Lucia’s). Today, I’m presenting what I think is an interesting approach to the problem using maximum likelihood. In a way, the approach builds on work that I did last year […]
Antarctic Sea Ice Re-visited
May 6, 2009 – 9:43 AM
Jeff Id did an interesting post a few days ago on Antarctic sea ice in which he provided the following interesting graphic of Antarctic seaice area anomalies, which, from the texture, is daily, rather than monthly: Figure 1. Antarctic seaice area anomaly (Jeff Id version) Jeff’s data reference was to the following webpage at NSIDC, […]
Undergraduate Geologists and Secretary Chu
May 4, 2009 – 6:47 PM
A few years ago, I noticed some interesting presentations by geology undergraduates at the Keck Symposium – see 4 papers online here – describing fossils from the Miocene and Pliocene (both well after the Cretaceous) in the Arctic. Here’s a tree from the Pliocene – which is not “hundreds of millions” of years ago, but […]
Will Andy Revkin Tee Off on Chu?
May 3, 2009 – 7:34 PM
I don’t like talking about political appointees, but Chu is supposed to be a “scientist”. If you don’t know the answer to something, it’s a good idea not to pretend that you do. Take a look at Chu’s appearance before the House Energy and Commerce Committee url (h/t reader Gene) [self-snip] Chu was there as […]
Spot the Hockey Stick #n
May 3, 2009 – 1:06 PM
In a presentation on April 7, 2009, Steven Chu uses the Graybill strip-bark bristlecone chronology (aka the Mann hockey stick) in a presentation. See page 7 here. (h/t to reader Gene). The Chu graphic even uses Mann’s overlay of temperatures, opportunistically ending at the high point of 1998. I wonder how Chu does at identifying […]
Truncated SVD and Borehole Reconstructions
May 3, 2009 – 12:57 PM
In recent discussions of Steig’s Antarctic reconstruction, one of the interesting statistical issues is how many principal components to retain. As so often with Team studies, Steig provided no principled reasoning for his selection of 3 PCs, statements about their supposed physical interpretation were untrue and, from some perspectives, the choice of 3 seems opportunistic. […]
Irreproducible Results in PNAS
Apr 24, 2009 – 11:10 AM
In Al Gore’s movie and book An Inconvenient Truth, he presents a graph which he identifies [in the book] as “Dr. Thompson’s Thermometer.” Gore attributes this graph to the ice core research of Lonnie Thompson, and says [in the book] that it provides independent evidence for the validity of the “Hockey Stick” temperature reconstruction of Michael Mann […]
Climate Audit 