The inquiry about the impact of alpha trees reminded me of a cute little diagram truncation by Briffa, Jones et al.
Here is a type of diagram which I often do on tree ring data. I’ve never seen anything like this in the tree ring literature, but some of you may be interested.
The Polar Urals tree ring site is another staple of multiproxy studies, being used in Bradley and Jones [1993], Hughes and Diaz[1994], Overpeck et al. [1997], Jones et al. [1998], MBH98, MBH99, Crowley and Lowery [2000], Esper et al. [2002], Bradley, Hughes and Diaz [2003] and Rutherford et al. [2005] (which recycles MBH98). In fact, […]
Briffa’s temperature reconstruction from Tornetrask (northern Sweden) tree rings is a staple of multiproxy studies, used in Bradley and Jones [1993], Hughes and Diaz [1994], Jones et al. [1998], MBH98, MBH99, Briffa and Crowley and Lowery [2000], Briffa et al. [2000], Bradley, Hughes and Diaz [2003], Mann and Jones [2003], Jones and Mann [2004]. Briffa […]
Cook et al. [2004] is a “reconstruction of past drought across North America from a network of climatically sensitive tree-ring data”. It uses 835 sites in North American regions overlapping Mann’s PC network. I thought that it would be interesting to compare the two networks. Of course nothing is straightforward when you’re dealing with the […]
In some recent commentary trying to backpedal from the hockey stick, "detection and attribution" studies have been cited as alternative validations and Hegerl et al [2003] is cited as a key example. I have not looked in detail at these studies, but some features of Hegerl at al. [2003] struck me as so obvious that […]
There is a new (December 2004) archive for Jones and Mann [2004] at WDCP here. Jones (pers. comm., July 2004) had previously sent me another version of this data. Here are some comments to save others some time in considering this archive.
I’ve been working through Jones and Mann [2004] and Mann and Jones [2003] and the following graphic caught my eye. I quickly compare it here to the version used in Jones et al. [1998] and the Mann and Jones [2003] SH reconstruction (shown in Jones and Mann [2004]). Figure 1. Replication of Figure 4 (bottom […]
One of the two strongest contributors to higher temperatures in Moberg’s 20th century proxies is higher incidence of subpolar glob. bulloides
A lot of people who are interested in the issue of the effect of bristlecone pines on MBH98 do not have access to Graybill and Idso [1993], the underlying reference, which we referred to in both MM05 articles and which I mentioned in this post . Here’s a pdf version , courtesy of the U.S. […]
Climate Audit 