One of Loehle’s proxies – the one that ends in the 16th century – has occasioned some interest and I took some time to investigate it. It is an alkenone SST estimate from ocean sediment core MD95-2011 from the Norwegian Sea (66 58.19N, 07 38.36E and 1048 m). The series ends in the 16th century […]
While trawling for high-resolution ocean sediment cores, I noticed an interesting core offshore Morocco, reported by McGregor et al (Science 2007) earlier this year. This study was released just prior to IPCC complete with press release. Can’t we all think back to a quieter time when a scientist having labored to produce a detailed analysis […]
Richard T and I had an interesting discussion here about the bioturbation and coarse fractions in the Arabian Sea G Bulloides proxy that is very influential in Moberg and not used in Loehle (as it was not calibrated to temperature.) I had observed that the increase in G Bulloides percentage in the very top part […]
Francois O writes in: For those interested in the role of the Sun on the climate, and how reconstructions can be used to assess it, there is an interesting paper just out in JGR by Nicola Scafetta and B J West. The paper is available here. This is a continuation of their previous work. Basically […]
Pete H has uploaded some terrific Almagre panoramas online here . Pete says: Also, I’ve uploaded many of the new panoramas that provide a way to see this bristlecone forest in context. They will soon be integrated into Google Earth. Visit http://www.GigaPan.org and search for Almagre to see this work in progress Integrated into Google […]
A couple of days ago, I received the Almagre measurement data from the excellent dendrochronological lab at the Univesity of Guelph. I’ve posted the measurement data online in two files (as I received them): crossdated and uncrossdated. There are 41 cores that have been crossdated and 20 cores are not crossdated. These files are as […]
Continuation of Craig Loehle Reconstruction
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 […]
In 2002, Lonnie Thompson drilled a 460 meter ice core in a col between Mounts Bona and Churchill in Alaska. As of October 2003, they had analyzed over 5600 samples and concluded that the core covered approximately 2500 years. A presentation was made at AGU in December 2004. The data was not discussed in IPCC […]
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, […]
Climate Audit 