There has been some recent discussion of the Briffa bodge – an early technique to hide the decline. I had drafted a post on the topic and its handling by the Muir Russell “inquiry” in early July 2010, but did not publish the post at the time. In today’s post, I’ve slightly updated my July […]
We keeping hearing the incantation from the Team that all the reconstructions on the Jesuit Index show a warmer modern than medieval period. I reported that I recently obtained a digital version of Grudd’s revised Tornetrask reconstruction and I’ve been anxious to test out its impact on the Jones et al 1998 reconstruction (together with […]
I’ve been trying for nearly a year to get a digital version of the Tornetrask reconstruction of Grudd (2008), also referred to in his thesis. Last week, Hakan Grudd sent me a digital version of the MXD series – hooray! Previously I’ve previewed this new version using clips from the articles or thesis e.g here. […]
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 […]
I’m finally trying to finalize my presentation on Jones et al [1998] for the US GCRP workshop in November, which is necessarily mostly about the Polar Urals and Tornetrask reconstructions. Bot MXD chronologies and RW chronologies are supposed to correlate to temperature. So an obvious quesiton is how do they correlate to eachother. I’ve plotted […]
In my post on Tornetrask showing the impact of the Briffa-Jones "adjustment", I didn’t comment on confidence intervals.
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.
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 […]
Climate Audit 