Monthly Archives: March 2005

Bristlecone/Foxtail #2: Bighorn Plateau

Here’s a beautiful picture of a foxtail pine from the MWP, illustrating eloquently the change in treelines: Original Caption: A dead trunk above current treeline from a foxtail pine that lived about 1000 years ago near Bighorn Plateau in Sequoia National Park.

Tornetrask #4: Confidence Intervals

In my post on Tornetrask showing the impact of the Briffa-Jones "adjustment", I didn’t comment on confidence intervals.

Tornetrask #3: A Truncated Diagram

The inquiry about the impact of alpha trees reminded me of a cute little diagram truncation by Briffa, Jones et al.

Bristlecone/Foxtail Site #1: Cirque Peak

I have some odds and ends in inventory about bristlecone and foxtail sites, which I’m going to post up, mostly because I find the information rather interesting. Most dendrochronologists assume that the bristlecone/foxtail sites are far too remote to have experienced direct human effects. As far as I’m concerned, this is an assumption that needs […]

Tornetrask #2

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.

Altitude at Briffa’s Polar Urals

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, […]

Spot the Hockey Stick #13:

Sometimes the Mann Hockey Stick (1999) is eclipsed by another reconstruction which goes twice as far back and with even less statistical significance (if that’s possible) than the original. Yes, it’s the "Mann Hockey Stick mark deux" produced by Drs Jones and Mann to widespread indifference in 2003. Steve has tried replicating this one as […]

CSICOP: Judging Authority

Just a short note about an article in the Skeptical Inquirer on the subject of "Judging Authority" and the necessity of critical thinking. Living well requires that we be able to evaluate our environment rationally. Simple things, like crossing the street, shopping, eating, and listening to our doctors, involve three skills: critical thinking, evidential reasoning, […]

Briffa’s Tornetrask Reconstruction

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 […]

Bristlecone Pines Again

Mann has recently provided some inaccurate information on his treatment of bristlecone pines.