Tag Archives: divergence

Desmogging Desmog’s Tricks – Part 2

Desmog, without carrying out any due diligence of their own, spread false information derived from Brian Angliss here. Angliss alleged that I had “made a number of claims that are not supported by the published record”. His second such allegation arose from comments in a CA post on the Commons Select Committeee here. Towards the […]

Devi et al 2009

See comments introducing this extremely interesting article. UPDATE: Since some readers are having routing issues downloading/reading this Devi et al paper, I have mirrored it here (PDF) for your convenience. – Anthony

Craig Loehle on the Divergence Problem

Tree rings are widely used for reconstructing climate and past climates are critical for putting the current climate (including global temperatures) into the proper perspective. Is current warming unusual? Only a comparison to the past can tell. To help gain a better understanding of the past and how global temperatures may have behaved, researchers frequently […]

Rob Wilson and the Yamal Divergence

The archived information for Wilson et al 2007 contains interesting new information on an unpublished West Siberian series (Putorama, 70 31 N, 92 57E). In this case, I was actually able to obtain a better correlation to gridcell temperature than the one reported by Rob by using a gridcell closer to the actual location. This […]

Divergence: the Young Dendros Rebel

I’ll try to do reports on various interesting aspects of the AGU conference over the next few weeks. Today I’m going to post on the session on the Divergence Problem, initiated and chaired by Rob Wilson, and which, for the most part, consisted of young dendros probing critically at the issue of the failure of […]

How IPCC AR4 authors defended the Briffa data deletions

I recently received a copy of how IPCC authors answered the review comments, including their answers to the requirement of one reviewer that the deleted Briffa data be restored (and an explanation given for the inconvenient bits.) You may recall the observation of one reader in the discussion of Swindle, the reader observing: If a […]

New Light on Old Fudge

One of my first blog postings was on Briffa’s very first fudging (2011 update: the “Briffa bodge”) of a temperature reconstruction – his adjustment of the Tornetrask reconstruction – a reconstruction that is used in virtually every study. This was one of the first encounters with the Divergence Problem. Tornetrask MXD went down in the […]

More on the Divergence Problem

Two new things on the Divergence Problem. The IPCC First and Second Drafts did not contain a whisper of a mention of the divergence between ring widths and density in the second half of the 20th century, although this is rather an important issue. It came up at the NAS Panel and was completely unresolved […]

Rutherford 2005 and the Divergence Problem

Rutherford et al 2005 (the et al being half the Hockey Team: Mann, Bradley, Hughes, Briffa, Jones, Osborn) is a re-statement of the MBH98 network (flawed PCs and all) and the Briffa et al 2001 network using RegEM. I haven’t figured out exactly what the properties of the RegEM method are as compared to other […]

Cook et al[2004]: More Cargo Cult?

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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