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Hockey Team World Tour Lands in Arctic
Team ‘Hockey Stick’ is infamous for highly questionable temperature reconstructions of the Northern Hemisphere, Antarctic, Atlantic Hurricanes, and now Arctic temperatures as published in Science magazine on 4th September 2009:
Recent Warming Reverses Long-Term Arctic Cooling
Darrell S. Kaufman et al, Science 4 September 2009:
Vol. 325. no. 5945, pp. 1236 – 1239
DOI: 10.1126/science.1173983
Abstract: The temperature history of the first millennium C.E. is sparsely documented, especially in the Arctic. We present a synthesis of decadally resolved proxy temperature records from poleward of 60°N covering the past 2000 years, which indicates that a pervasive cooling in progress 2000 years ago continued through the Middle Ages and into the Little Ice Age. A 2000-year transient climate simulation with the Community Climate System Model shows the same temperature sensitivity to changes in insolation as does our proxy reconstruction, supporting the inference that this long-term trend was caused by the steady orbitally driven reduction in summer insolation. The cooling trend was reversed during the 20th century, with four of the five warmest decades of our 2000-year-long reconstruction occurring between 1950 and 2000.
Marc Morano has a nice summary over at Climate Depot:
Not Again! Media Promoting Arctic ‘Hockey Stick’ – Claim Temps Warmest in 2000 Years – But Scientists Already Rebuking Latest Study. Temperature claims ‘contradict numerous previous Arctic studies.’
The study has also amused Steve McIntyre of Climate Audit:
“Amusingly, the [Arctic study's lead author] Kaufman Team perpetuates Mann’s upside down use of the Tiljander proxy,” McIntyre wrote on September 3, 2009. “You can readily see that this closely matches the Mann version,” McIntyre noted. “The most cursory examination [of the study] shows the usual problem of seemingly biased picking of proxies without any attempt to reconcile proxy conflicts,” McIntryre wrote.
Climate Audit: Kaufman and Upside-Down Mann
September 4th, 2009 at 11:12 pm
Paul-I’ve been trying to figure out where the contemporary data for the figure comes from. The Arctic instrumental history doesn’t look atnything like it:
http://www.climateaudit.org/?p=6932#comment-355051
And of course I am also left wondering, what the heck happened to Greenland’s MWP? The Team is getting brazen. Next they’ll be saying that the MWP didn’t happen in Europe either!
September 5th, 2009 at 2:09 am
It’s an appalling paper – it seems that Science (like Nature) will publish any rubbish that claims to support AGW.