2015 March « Climate Audit
10 posts published by Stephen McIntyre and niclewis during March 2015| Climate Audit
10 posts published by Stephen McIntyre and niclewis during March 2015| Climate Audit
As discussed in previous article, Esper et al (2024) link, the newest hockey stick diagram, asserted that 2023 was the “warmest summer” in millennia by an updated version of “Mike…| Climate Audit
A couple of weeks ago, the New York Times and other institutional media proclaimed that “tree rings” (sometimes “ancient tree rings”) had “shown” that 2023 was t…| Climate Audit
A couple of years ago, Brandon Shollenberger wrote up a lengthy review of Mann’s Hockey Stick Wars at Lucia’s. Brandon has fleshed out his review in an ebook here. Brandon summ…| Climate Audit
Recently, while re-examining PAGES2K, the current paleoclimate darling, I noticed that PAGES2K(2019) reverted to a variation of the Twisted Tree Heartrot Hill (Yukon) [TTHH] tree ring chronology that we had already criticized in 2003 as being obsolete when used by Mann et al 1998. PAGES2K was supposed to be an improvement on Mann et al […]| Climate Audit
Today’s article is about one of the D’Arrigo et al 2006 datasets. D’Arrigo et al 2006, then under submission, had been cited in drafts of the IPCC Fourth Assessment Report. I had been accepted as an IPCC reviewer and, as an IPCC reviewer, I asked IPCC to make the data available to me or to […]| Climate Audit
MBH98 used three Jacoby tree ring chronologies from Alaska: Four Twelve (ak031) – discussed here, Arrigetch (ak032) and Sheenjek (ak033). Sheenjek will be discussed in this article. In our compilation of MBH98 in 2003, we observed that the Sheenjek chronology archived at NOAA Paleo was not the same as the “grey” version used in MBH98. […]| Climate Audit
Four Twelve (Alaska) was one of the 11 Jacoby and D’Arrigo series used in MBH98. In our original 2003 article, we observed that the MBH98 version of this chronology differed substantially from the chronology officially archived at NOAA, and, in our sensitivity study, used the archived version (after using the MBH version for benchmarking.) Among […]| Climate Audit
We’ve long discussed the bias imparted by ex post selection of data depending on whether it went up in the 20th century. Likening such after-the-fact selection to a drug study carried out only on survivors. The Jacoby and d’Arrigo 1989 network was a classic example: the original article reported that they had sampled 36 northern treeline […]| Climate Audit
In numerous ancient Climate Audit posts, I observed that all MBH98 operations were linear and that the step reconstructions were therefore linear combinations of proxies, the coefficients of which …| Climate Audit
In today’s post, I will report on some excellent work on MBH98 by Hampus Soderqvist, who discovered an important but previously unknown Mike’s Nature Trick: Mann’s list of proxies…| Climate Audit
Continued from here. The Dirty Laundry residual datasets for AD1000, AD1400 and AD1600 were each calculated using Mann’s “sparse” instrumental dataset, but the resultant sigmas an…| Climate Audit
The 30-60N latitude band gets lots of attention in paleoclimate collections – probably more proxies than the rest of the world combined. The 30-60S latitude band is exactly the same size, but…| Climate Audit
Mar 2, 2021. This post was written in 2015 but, for some reason, I didn’t publish it at the time. Seems just as valid today as when it was written. Esper et al 2012, Orbital Forcing o…| Climate Audit
