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I forgot to include that Alley deduces a large temperature drop over the Holocene because of this data. 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? is now following The Typepad Team
Jul 25, 2012