One of my objectives in looking at both the Dulan tree ring data and Chinese station data is to take a fresh look at the Dunde ice core information, which is near Dulan and Delingha. twq says that he’s been analyzing low-frequency information from Dunde. A caveat for twq: the Dunde archiving situation is a […]
As noted yesterday, Jacoby and Cook didn’t get the memo about not using the Dulan juniper chronology of Wang et al 1983 (also used in Crowley and Lowery 2000) and used it in a panel diagram in Gou et al [Ann Glac 2006]. Wang et al 1983 is unusual in a dendroclimatic publication, because they […]
In a recent post, I challenged the Dendro Truth Squad to root out use of precipitation proxies in multiproxy studies (which the NAS Panel also encouraged avoidance of). Instead of illustrating this with bristlecones one more time (although they obviously occur in a high desert), I illustrated the challenge with the example of Dulan junipers, […]
When I was a teenager, I liked Joseph Conrad’s books (which bear re-reading as an adult). I remember reading Younghusband’s account of his travels in Sinkiang. These books undoubtedly were a reason why I traveled round the world when I was 20, going to some out of the way spots. The Dulan junipers, which we’ve […]
The next installment in our search for upper treeline proxies evidencing the AR4 SPM claim that : “Studies since the TAR draw increased confidence from additional data showing coherent behaviour across multiple indicators in different parts of the world” takes us to the Canadian Rocky Mountains, to a study mentioned in the Wilson and Luckman […]
I realize that not all CA readers are interested in multivariate methods and that dendroclimatologists want to “forget the math”, but I find it interesting to try to relate dendro and paleoclimate recipes to known statistical methodologies that you can read about in texts. I commented the other day on the form of Principal Components […]
By Stephen McIntyre
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Also posted in Multivariate, Noamer Treeline, RegEM, Statistics
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Tagged borga, hegerl, magnus, multivariate, orthogonal, pls, ridge, ttls
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The Australian Broadcasting Corp. had an interview with Malcolm Hughes on Apr 5 when he once more attempted to blame the messengers for identifying the shortcomings of their own statistical methodology. We eagerly await the Dendro Truth Squad rebutting this “misinformation”.
In our continued search for evidence supporting the IPCC 4AR SPM claim that “”Studies since the TAR draw increased confidence from additional data showing coherent behaviour across multiple indicators in different parts of the world”, I am reviewing upper treeline North American site chronologies specifically mentioned in the short Wilson and Luckman 2003 survey of […]
In my continuing search for updated dendroclimatological temperature proxies, I started by looking at what had been archived at ITRDB; this has proved to be a very disappointing source of candidates. I’ve re-canvassed some literature for candidate unarchived information. In an email, Connie Woodhouse mentioned that their efforts with upper treeline sites in the U.S. […]
Wilson and Luckman 2003 observe: The first PCs from the RW and MXD PCA are naturally orthogonal (r = —0.006) over the 1900—1991 period suggesting the in’?fluence of different forcing mechanisms upon these parameters. They move on without pausing here, but this point should not be left without a commentary. The issue here is one […]
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