The bias arising from ex post selection of sites for regional tree ring chronologies has been a long standing issue at Climate Audit, especially in connection with Briffa’s chronologies for Yamal and Polar Urals (see tag.) I discussed it most recently in connection with the Central Northwest Territories (CNWT) regional chronology of D’Arrigo et al […]
One of the longest standing Climate Audit issues with paleoclimate reconstructions is ex post decisions on inclusion/exclusion of data, of which ex post decisions on inclusion/exclusion of sites/data in “regional [treering] chronologies” is one important family. This was the issue in the original Yamal controversy, in response to which Briffa stated that they “would never select or manipulate […]
The other day, I noticed that the long dormant WDCP supplementary information (and here) for D’Arrigo et al 2006, of which Rob Wilson is a coauthor, had been updated on April 30, 2012. In 2005, D’Arrigo et al (then under review at JGR) had been cited by IPCC AR4. At the time, as an IPCC […]
Two interesting new proxy studies out recently, one with a meticulous archive, one without. Kinnard et al 2011 (Nature) here is a proxy reconstruction using 69 proxies to reconstruct Arctic sea ice. It contains a comprehensive archive: all proxies as used as archived; all code is archived. Three of the coauthors are Canadians, including David […]
Now that we know the abysmally low replication of the modern portion of Briffa’s Yamal chronology (something previously unknown to specialists), I’ve been backtracking through some earlier documents to see how this may have impacted past studies. We’ve talked previously about how Briffa refused to provide measurement data to D’Arrigo et al 2006, resulting in […]
One of the most important IPCC representations is the supposedly tremendous quality control of its review process. I’ve mentioned in passing on a number of occasions that, when I sought to obtain supporting data for then unpublished articles, IPCC threatened to expel me as a reviewer. I’ve had a few requests to recount my experience […]
Rob Wilson has written in sharply criticizing me (Yamal Substitution #3) for a lack of a balanced presentation on the Yamal substitution, and, in particular, for not acknowledging the "clear statistical reasons (related to variance changes through time)" that he had provided me offline for why D’Arrigo et al 2006 made the Yamal substitution. Also […]
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