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I forgot to include that Alley deduces a large temperature drop over the Holocene because of this data.
http://www.igsoc.org/annals.old/21/igs_annals_vol21_year1995_pg64-70.pdf This is the paper that can put the '150 years' comment in proper context. See the figures. A significant amount of melt years occurred during the Mid-Holocene Optimum. The average over the last 4000 years is about every 250-300 years. This includes the MWP where seven of the last 8 occurred, meaning, before a few weeks ago 1889 was the only occurrence in the last 800-900 years or so. Dr. Alley's hypothesis is that these clusters of melts over 6000 years ago were do to high summer insolation. Is that unprecedented enough for ya kiddies?
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Jul 25, 2012