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Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
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Los umbrales para la glaciación bipolar del Cenozoico

Robert M Deconto1, David Pollard, Paul A Wilson

  • 1Department of Geosciences, University of Massachusetts, Amherst, Massachusetts 01003, USA. deconto@geo.umass.edu

Nature
|October 4, 2008
PubMed
Resumen
Este resumen es generado por máquina.

La glaciación temprana del Oligoceno (Oi-1) fue antártica, no bipolar. Este evento implicó un enfriamiento significativo de las profundidades marinas y el crecimiento del hielo antártico, desafiando las teorías anteriores de la glaciación simultánea del hemisferio norte.

Área de la Ciencia:

  • Paleoclimatología Paleoclimatología

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  • Modelado del clima Modelado del clima
  • Dinámica de las capas de hielo Dinámica de las capas de hielo
  • Sus antecedentes:

    • La historia glacial del Cenozoico tradicionalmente postula la glaciación antártica ~33.6 Ma, seguida por la glaciación del hemisferio norte ~3.1 Ma.
    • El evento Oi-1 (~33.6 Ma) muestra un rápido cambio en los isótopos de oxígeno, lo que sugiere el crecimiento del hielo y el enfriamiento de los océanos.
    • El contraste entre los registros de aguas profundas y la evidencia del hemisferio norte ha planteado preguntas sobre Oi-1 como un evento de glaciación bipolar.