Climate Audit’s Steve McIntyre digs into new ‘not robust’ ‘Hockey Stick’: ‘Marcott Mystery #1’ .– ‘I am at present totally baffled. I’m disappointed that Marcott refused to explain’

I wrote to Marcott asking him for further details of how he actually obtained the uptick, noting that the enormous 1920-to-1940 uptick is not characteristic of the underlying data. Marcott’s response was unhelpful: instead of explaining how he got the result, Marcott stated that they had “clearly” stated that the 1890-on portion of their reconstruction was “not robust”. I agree that the 20th century portion of their reconstruction is “not robust”, but do not feel that merely describing the recent portion as “not robust” does full justice to the issues. Nor does it provide an explanation.

Prominent Geologist Dr. Don Easterbrook: Validity of Marcott et al. new ‘Hockey Stick’ study PART II — The study’s ‘conclusion is wrong’

Easterbrook part 2 excerpt:

The Marcott et al. curve shows a nearly vertical line for recent warming, which they claim puts present temperatures above any in the past 4,000years. This nearly vertical part of their curve apparently comes not from their proxy data, but is pasted on from elsewhere and plays a central role in their contention that present temperatures and the rate of warming are ‘unprecedented in the past 4,000 years.’


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For part one of Easterbrook’s analysis see:

Geologist calls new warmist study ‘wrong’: ‘Temps during virtually all of period from 10,000 to 1,500 years ago were warmer thanpresent & 85% of past 10,000 years were warmer than present’ — Prominent Geologist Dr. Don Easterbrook: ‘In past 10,000 years, at least six other warm periods of magnitude equal to MWP occurred; 9 other warm periods that were 0.5°C warmer than MWP occurred; two warm periods that were 1°C warmer than MWP occurred; & three warm periods that were 1.5°C warmer than MWP occurred. All of these periods warmer than MWP clearly contradict the Marcott et al. conclusions’