UPDATE: It appears the paper has been withdrawn and
credit acknowledgement given to Steve McIntyre, see below:
There was yet another recent “hockey stick” being foisted on the public. Gergis et al.
The average reconstructed temperature anomaly in Australasia during A.D. 1238–1267, the warmest 30-year pre-instrumental period, is 0.09°C (±0.19°C) below 1961–1990 levels.
Basically, another “ah-ha, man is at fault” pitch.
At Climate Audit, the paper was examined in more detail, and alarm bells went off. Concern centered around the 27 proxy data sets used in the study. Now, after Steve McIntyre found some major faults, it seems this paper has gone missing from the AMS website without explanation. All that remains is the Google cache thumbnail image, not even the cached web page. See below:
Here is the original URL:
Here’s a backup copy: http://static.stuff.co.nz/files/melbourne.pdf
To read about how the takedown came about, I suggest this excellent summary from Bishop Hill as the technical details are rather thick: Another Hockey Stick broken
The problems with the paper in a nutshell:
- upside down proxy data again
- preselection of data, ignoring the whole set in many cases
- though they tried to justify preselection, the paper’s methodology doesn’t hold up (circular reasoning)
- inability to replicate given the data and methods used
In Gergis defense, they provided
full *some documentation and data at the outset, unlike some other hockey stick purveyors we know. This allowed the work to be checked independently. This is how science is supposed to work, and apparently it has.
(*Added: apparently Gergis refused some additional data Steve McIntyre requested, the documentation of this on his CA website)
It appears from my perspective that this is a failure of peer review at the AMS.
UPDATE: Further proof that the paper has truly been taken down, and this isn’t a web glitch.
1. The DOI link is also broken over at Real Climate in their article: Fresh hockey sticks from the Southern Hemisphere
- J. Gergis, R. Neukom, S.J. Phipps, A.J.E. Gallant, and D.J. Karoly, “Evidence of unusual late 20th century warming from an Australasian temperature reconstruction spanning the last millennium”, Journal of Climate, 2012, pp. 120518103842003-. DOI.