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      Trends, rhythms, and aberrations in global climate 65 Ma to present.

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          Abstract

          Since 65 million years ago (Ma), Earth's climate has undergone a significant and complex evolution, the finer details of which are now coming to light through investigations of deep-sea sediment cores. This evolution includes gradual trends of warming and cooling driven by tectonic processes on time scales of 10(5) to 10(7) years, rhythmic or periodic cycles driven by orbital processes with 10(4)- to 10(6)-year cyclicity, and rare rapid aberrant shifts and extreme climate transients with durations of 10(3) to 10(5) years. Here, recent progress in defining the evolution of global climate over the Cenozoic Era is reviewed. We focus primarily on the periodic and anomalous components of variability over the early portion of this era, as constrained by the latest generation of deep-sea isotope records. We also consider how this improved perspective has led to the recognition of previously unforeseen mechanisms for altering climate.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          0036-8075
          0036-8075
          Apr 27 2001
          : 292
          : 5517
          Affiliations
          [1 ] Earth Sciences Department, University of California, Santa Cruz, CA 95064, USA. jzachos@es.ucsc.edu
          Article
          292/5517/686
          10.1126/science.1059412
          11326091
          56325585-d0f3-43f0-a341-c505a6376608

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