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Related Experiment Videos

Detecting holocene changes in thermohaline circulation.

L D Keigwin1, E A Boyle

  • 1Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA. lkeigwin@whoi.edu

Proceedings of the National Academy of Sciences of the United States of America
|March 4, 2000
PubMed
Summary

Deep ocean circulation changes closely followed climate shifts during the last glacial cycle. Evidence for similar deep ocean changes during the current interglacial period remains unclear.

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Area of Science:

  • Paleoceanography
  • Climate Science
  • Oceanography

Background:

  • Deep ocean circulation is a key component of Earth's climate system.
  • Past reorganizations of ocean water masses correlated with millennial-scale climate changes during glacial periods.

Purpose of the Study:

  • To investigate the relationship between deep ocean circulation and climate variability during the present interglacial period.
  • To compare recent ocean circulation patterns with those observed during the last glacial cycle.

Main Methods:

  • Analysis of paleoceanographic proxy records.
  • Correlation of deep ocean circulation indicators with climate data.

Main Results:

  • Millennial-scale climate changes during the last glacial cycle were linked to significant deep ocean reorganizations.

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  • Evidence for concurrent deep ocean circulation changes during the present interglacial is currently ambiguous.

    • Conclusions:

    • Deep ocean circulation plays a critical role in regulating climate on millennial timescales.
    • Further research is needed to clarify the extent of deep ocean circulation changes during the Holocene.