Search Results for: Almagre

Off to Georgia Tech

I’m going to Georgia Tech for a couple of days at the kind invitation of JEG (Julien Emile-Geay) and Judith Curry. I’ll be presenting at their Friday afternoon EAS seminar series ( (3:30 to 4:30), which is geared towards a broad scientific audience. In addition, I’ll be spending time with each of the protagonists, plus […]

More Mystery at Sheep Mountain

The Sheep Mountain CA bristlecone site is the most important proxy in MBH and the MBH98 reconstruction actually doesn’t differ very much from the Sheep Mountain tree ring chronology (other than it ends in 1980 at pretty much the peak of the Sheep Mt chronology and doesn’t include the downtick in the 1980s.) Various efforts […]

Divergence: the Young Dendros Rebel

I’ll try to do reports on various interesting aspects of the AGU conference over the next few weeks. Today I’m going to post on the session on the Divergence Problem, initiated and chaired by Rob Wilson, and which, for the most part, consisted of young dendros probing critically at the issue of the failure of […]

Malcolm Hughes and the Witness Protection Program

Malcolm Hughes coauthor Matthew Salzer) made a presentation entitled “Twentieth Century Bristlecone Pine Tree Rings near Upper Tree Limit Wider than in Recent Millennia”. This included a report on Sheep Mountain. He showed a picture of Matthew Salzer on Sheep Mountain and praised his work. He said that there was no difference between strip bark […]

AGU 2007

OFf to AGU tomorrow morning. I’m doing two presentations – an oral presentation on hurricanes on Wednesday in a Spatial Statistics session (with Roger Pielke) and a poster on Friday on Almagre tree rings (with Pete Holzmann). See* for the two PPTs. AGU tends to be exhausting. Plus I’ve got a reasonably full social […]

The Sheep Mountain Update

This post contains an important calculation, which will affect the many multiproxy studies in which Graybill bristlecone chronologies impact results either directly or via Mann’s PC1. Hans Erren has digitized the data from the Ababneh Thesis. In Figure 1 below, I’ve shown the difference between the updated Sheep Mountain chronology and the Graybill chronology. The […]

Hughes and the Ababneh Thesis

I’ve had a few requests to comment on Eli Rabett’s recent post, observing that he was unable to observe a Medieval Warm Period in the bristlecone chronology reported in Salzer and Hughes 2006. Looking at the tree ring index one can clearly see many large eruptions, the little ice age, but no European Warm Period, […]

Gerry North Lecture in Boulder, Nov 2, 2007

Gerry North will be back in Boulder on Nov 2, 2007 delivering a lecture at CIRES at 4 pm on climate over the past 1000 years. The announcement says A variety of evidence points to a gradual cooling of the planet from about 1000 AD to a few hundred years ago when it bottomed out. […]

Strip Bark at Upper Wright Lakes Foxtails

As a sort of Methadone replacement for Mann’s bristlecone PC1 (which uses Graybill’s strip bark chronologies), two Esper foxtail chronologies (Upper Wright Lakes and Boreal Plateau) have come into use by the Team. These two chronologies were used separately in the small Esper network (two of only 7 or so medieval chronologies) making a very […]

IPCC AR4 and the Return of Chucky – He’s Baaack!

Here’s something I meant to post up when AR4 came out. I was reminded of this when Rob Wilson posted recently: Lastly, lets not forget that TR based reconstructions of NH temperatures exist that do not use Bristlecone pine or Foxtail data. Rob’s point here is very disingenuous (to use Mann-speak) since millennial reconstructions are […]