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Related Experiment Video

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Thresholds for Cenozoic bipolar glaciation.

Robert M Deconto1, David Pollard, Paul A Wilson

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|October 4, 2008
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This summary is machine-generated.

The early Oligocene glaciation (Oi-1) was Antarctic, not bipolar. This event involved significant deep-sea cooling and Antarctic ice growth, challenging previous theories of simultaneous Northern Hemisphere glaciation.

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Area of Science:

  • Paleoclimatology
  • Climate Modeling
  • Ice Sheet Dynamics

Background:

  • The Cenozoic glacial history traditionally posits Antarctic glaciation ~33.6 Ma, followed by Northern Hemisphere glaciation ~3.1 Ma.
  • The Oi-1 event (~33.6 Ma) shows a rapid shift in oxygen isotopes, suggesting ice growth and ocean cooling.
  • Contrasting deep-sea records and Northern Hemisphere evidence have raised questions about Oi-1 as a bipolar glaciation event.

Observation:

  • Global climate/ice-sheet modeling was employed to test the bipolar glaciation hypothesis.
  • Model simulations considered Cenozoic atmospheric CO(2) decline and orbital forcing.
  • Key thresholds for Northern Hemisphere (~280 p.p.m.v.) and Antarctic (~750 p.p.m.v.) glaciation were determined.

Findings:

  • Oi-1 is best explained by Antarctic glaciation alone, not bipolar glaciation.
  • Deep-sea cooling reached up to 4°C, with Antarctic ice less depleted isotopically (-30 to -35‰).
  • Rapid CO(2) drawdown to below 280 p.p.m.v. would have been necessary for simultaneous Northern Hemisphere glaciation, which is not supported by proxy data.

Implications:

  • The Oi-1 event signifies Antarctic ice sheet growth and significant deep-sea cooling.
  • Northern Hemisphere ice sheets may have been possible ~20 million years earlier than previously thought, around 25 Ma.
  • This revised timeline could explain Miocene sea-level variations and advance our understanding of Cenozoic climate dynamics.