Clim. Past Discuss., 6, 659-679, 2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Climate of the Past (CP). Please refer to the corresponding final paper in CP.
Clustering climate reconstructions
G. Bürger
Pacific Climate Impacts Consortium, Victoria, Canada

Abstract. A systematic coherence analysis is presented for the set of the most prominent millennial reconstructions of Northern hemispheric temperature. The large number of mutual coherences underwent a clustering analysis that revealed five significant, mutually incoherent ("inconsistent") clusters. The use of multiple proxies seems to be causing the clustering, at least in part, but not in an easily definable, physical way. Alternatively, a multidimensional scaling is performed on the same set of coherences. This results in a graphic, two-dimensional rendering of the reconstructions whose geometry (location and distance) is given by the coherences. Both approaches offer complementary ways in dealing with the inconsistencies.

Citation: Bürger, G.: Clustering climate reconstructions, Clim. Past Discuss., 6, 659-679, doi:10.5194/cpd-6-659-2010, 2010.
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