known in particular for his statistical critique, with economist Ross McKitrick, of the controversial hockey stick graph, which shows a sharp, and arguably unprecedented, increase in late 20th century global temperature.
He is at his sleuthing best again and Science will soon have to retract this new “hockey stick” paper
A Reconstruction of Regional and Global Temperature for the Past 11,300 Years, by Shaun A. Marcott, Jeremy D. Shakun, Peter U. Clark and Alan C. Mix, Science 8 March 2013: Vol. 339 no. 6124 pp. 1198-1201 DOI: 10.1126/science.1228026
This paper is apparently based on Marcott’s PhD thesis but the thesis contains no hockey stick!
By the time the paper was published a hockey stick had appeared. In the most generous interpretation the paper was “modified” to fit in with global warming dogma before being published in Science. A less generous – but more likely – interpretation is that this is just fraud instigated probably by the global warming pundits who were the reviewers of the Science paper.
McIntyre’s latest post is a breathtaking indictment of the paper:
Marcott, Shakun, Clark and Mix did not use the published dates for ocean cores, instead substituting their own dates. The validity of Marcott-Shakun re-dating will be discussed below, but first, to show that the re-dating “matters” (TM-climate science), here is a graph showing reconstructions using alkenones (31 of 73 proxies) in Marcott style, comparing the results with published dates (red) to results with Marcott-Shakun dates (black). As you see, there is a persistent decline in the alkenone reconstruction in the 20th century using published dates, but a 20th century increase using Marcott-Shakun dates. (It is taking all my will power not to make an obvious comment at this point.)
Figure 1. Reconstructions from alkenone proxies in Marcott style. Red– using published dates; black– using Marcott-Shakun dates.
The media went bonkers in reporting the Marcott paper and this diagram will now go down in infamy:
I cannot draw but I have a clear image of a lone McIntyre battling against the Hockey Sticks. Perhaps a Josh can do justice to the image in my head.