The paper by Shi et al (2013) is fairly convincing as to at least the last 1,000 years in the Northern Hemisphere. I am actually surprised that paper has not been discussed here since it aims at dealing with many of the criticisms of paleoclimate research. They use 45 annual proxies which are all greater than 1,000 years in length and all have a “demonstrated” temperature relationship based on the initial authors interpretations.
Robert correctly observed that Shi et al was well within the multiproxy specialization of Climate Audit and warranted coverage here. However, now that I’ve examined it, I can report that it is reliant on the same Graybill bristlecone chronologies that were used in Mann et al 1998-99. While critics of Climate Audit have taken exception to my labeling the dependence of paleoclimatologists on bristlecone chronologies as an “addiction”, until paleoclimatologists cease the repeated use of this problematic data in supposedly “independent” reconstructions, I think that the term remains justified.
While Robert reported that all these series had a “demonstrated” temperature relationship according to the initial authors’ interpretation, this is categorically untrue for Graybill’s bristlecone chronologies, where the original authors said that the bristlecone growth pulse was not due to temperature and sought an explanation in CO2 fertilization. (The preferred CA view is that the pulse is due to mechanical deformation arising from high incidence of strip barking in the 19th century, but that is a separate story.) As a matter of fact, by and large, the bristlecone chronologies failed even Mann’s pick-two test.
Shi et al also show a nodendro reconstruction. This has a much lesser semi-stick. This mainly uses a subset of Kaufman et al 2009 data. In a forthcoming post, I’ll show that even this weak result is questionable due to their use of contaminated data and upside-down data (not Tiljander, something different.)