THE MM CRITIQUE OF THE MBH98 NORTHERN HEMISPHERE CLIMATE INDEX UPDATE AND IMPLICATIONS.pdf
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THEM
THE MM CRITIQUE OF THE MBH98 NORTHERN
HEMISPHERE CLIMATE INDEX: UPDATE AND
IMPLICATIONS
Stephen McIntyre
512–120 Adelaide St. West, Toronto, Ontario Canada M5H 1T1;
Ross McKitrick
Department of Economics, University of Guelph, Guelph Ontario Canada N1G2W1.
ABSTRACT
The differences between the results of McIntyre and McKitrick [2003] and Mann
et al. [1998] can be reconciled by only two series: the Gaspé cedar ring width
series and the first principal component (PC1) from the North American tree ring
network. We show that in each case MBH98 methodology differed from what was
stated in print and the differences resulted in lower early 15th century index values.
In the case of the North American PC1, MBH98 modified the PC algorithm so
that the calculation was no longer centered, but claimed that the calculation was
“conventional”. The modification caused the PC1 to be dominated by a subset of
bristlecone pine ring width series which are widely doubted to be reliable
temperature proxies. In the case of the Gaspé cedars, MBH98 did not use archived
data, but made an extrapolation, unique within the corpus of over 350 series, and
misrepresented the start date of the series. The recent Corrigendum by Mann et al.
denied that these differences between the stated methods and actual methods have
any effect, a claim we show is false. We also refute the various arguments by Mann
et al. purporting to salvage their reconstruction, including their claims of
robustness and statistical skill. Finally, we comment on several policy issues
arising from this controversy: the lack of consistent requirements for disclosure of
data and methods in paleoclimate journals, and the need to recognize the
limitations of journal peer review as a quality control standard when scientific
studies are used for public policy.
1. INTRODUCTION
The Northern Hemisphere temperature index of Mann et al. [1998, “MBH98”],
together with its extension in Mann et al. [1999], was adopted by the Intergovernment
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