Tag Archives: Ababneh

Sheep Mountain Update

Several weeks ago,  a new article (open access) on Sheep Mountain (Salzer et al 2014 , Env Res Lett) was published, based on updated (to 2009) sampling at Sheep Mountain. One of the longstanding Climate Audit challenges to the paleoclimate community, dating back to the earliest CA posts, was to demonstrate out-of-sample validity of proxy reconstructions, […]

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 […]

A New Divergence Problem

A reader has drawn to my attention that chapter 3 of the Ababneh Thesis, disussed previously at CA here here and here was published in Quaternary International (in Sept 2007 just prior to my initial post.) Since I did not refer to this peer reviewed publication in my earlier review, I wish to update these […]

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 […]

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, […]

The Ababneh Thesis

As I mentioned yesterday, Malcolm Hughes and/or the University of Arizona Laboratory for Tree-Ring Research had gone to the trouble of blocking my IP address from accessing their website. Thanks to the help of a couple of CA readers, I was able to circumvent the block. This is the sort of petty behavior that gives […]


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