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Subsurface ocean warming preceded Heinrich Events.

Lars Max1, Dirk Nürnberg2, Cristiano M Chiessi3

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Subsurface ocean warming in the North Atlantic preceded Heinrich Events, suggesting a link between ocean heat accumulation and Laurentide Ice Sheet destabilization. Weakened ocean circulation may drive future Arctic glacier melt.

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Area of Science:

  • Paleoceanography
  • Glaciology
  • Climate Science

Background:

  • The drivers of Laurentide Ice Sheet instabilities during Heinrich Events are not fully understood.
  • Global environmental impacts of these events are well-documented.

Purpose of the Study:

  • Investigate the mechanism driving Heinrich Events.
  • Reconstruct past ocean conditions in the North Atlantic.

Main Methods:

  • Foraminifera-based ocean temperature and salinity reconstructions.
  • Analysis of a sediment core from the western subpolar North Atlantic.
  • Dating of sediment core for the last 27,000 years.

Main Results:

  • Rapid subsurface ocean warming (~150m) consistently preceded Heinrich Events.
  • Evidence of significant ocean heat accumulation near the Labrador Sea.
  • Ocean warming correlated with weakened Atlantic Meridional Overturning Circulation.

Conclusions:

  • Subsurface ocean heat accumulation, driven by weakened ocean circulation, likely triggered Laurentide Ice Sheet melting.
  • Future weakening of ocean circulation could destabilize modern Arctic glaciers.