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An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics

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  • Pat Neuman
    The Zachos, Dickens & Zeebe January, 2008 article points to an urgent need for the human race to take immediate steps to deal with anthropogenic global
    Message 1 of 1 , Feb 14, 2008
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      The Zachos, Dickens & Zeebe January, 2008 article points to an urgent
      need for the human race to take immediate steps to deal with
      anthropogenic global warming.

      ---

      NATURE|Vol 451|17 January 2008|doi:10.1038/nature06588

      James C. Zachos, Gerald R. Dickens & Richard E. Zeebe

      "Past episodes of greenhouse warming provide insight into the coupling
      of climate and the carbon cycle and thus may help to predict the
      consequences of unabated carbon emissions in the future."

      ...

      "To evaluate climate theories more thoroughly, particularly with regard
      to feedbacks and climate sensitivity to pCO2, it is desirable to study
      samples obtained when CO2 concentrations were high (approaching
      or exceeding 1,800 p.p.m.v.) and to make observations for intervals
      longer than those of ocean overturning and carbon cycling (more
      than 1,000 years)4. Earth scientists have therefore turned increasingly
      to ancient time intervals," ...

      ... Figure 1. "Response to massive carbon input. A simulation of
      atmospheric CO2 (a), ocean surface pH (b), ocean surface calcite
      saturation (c) and deep-ocean temperature changes (d) in response to
      the input of 5,000 Gt C of anthropogenic CO2 into the atmosphere,
      starting from pre-industrial CO2 levels (around the year 1860)."

      ...

      http://www.es.ucsc.edu/%7Ejzachos/pubs/Zachos_Dickens_Zeebe_08.pdf
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