Climate of the Past www.clim-past.net 1814-9324 1814-9332 6 4 2010 10.5194/cp-6-515-2010 http://www.clim-past.net/6/515/2010/ http://www.clim-past.net/6/515/2010/cp-6-515-2010.html http://www.clim-past.net/6/515/2010/cp-6-515-2010.pdf 515 523 2010-08-06 Clustering climate reconstructions G. Bürger gbuerger@uvic.ca Pacific Climate Impacts Consortium, Victoria, Canada 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. 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