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Related Experiment Videos

Spatial and temporal offsets between proxy records in a sediment drift.

Nao Ohkouchi1, Timothy I Eglinton, Lloyd D Keigwin

  • 1Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

Science (New York, N.Y.)
|October 12, 2002
PubMed
Summary
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Marine sediment records often rely on planktonic foraminifera for dating. However, alkenones in sediments can be thousands of years older, impacting paleoclimate reconstructions and sea surface temperature estimates.

Area of Science:

  • Paleoceanography
  • Marine Geochemistry
  • Quaternary Geology

Background:

  • Marine sediment cores provide crucial archives for reconstructing past climate and ocean conditions.
  • Radiocarbon dating of planktonic foraminifera is a standard method for establishing chronologies in these records.
  • Paleoclimate proxies derived from various sedimentary components are used to complement age models.

Purpose of the Study:

  • To investigate the temporal fidelity of alkenone paleoclimate proxies relative to planktonic foraminifera in marine sediments.
  • To assess the impact of potential age discrepancies on paleoceanographic reconstructions, particularly sea surface temperature estimates.
  • To evaluate the reliability of using readily transported sedimentary components for paleoenvironmental reconstructions.

Main Methods:

Related Experiment Videos

  • Radiocarbon dating of planktonic foraminifera.
  • Isolation and analysis of haptophyte-derived alkenones from sediment samples.
  • Comparison of age estimates derived from alkenones and foraminifera within the same sediment horizons.
  • Assessment of lateral sediment transport mechanisms.

Main Results:

  • Haptophyte-derived alkenones from Bermuda Rise drift sediments were found to be up to 7000 years older than coexisting planktonic foraminifera.
  • This significant temporal offset is attributed to the lateral transport of alkenones adsorbed onto fine particles from the Nova Scotian margin.
  • The age discrepancy markedly influences molecular-based estimates of past sea surface temperatures.

Conclusions:

  • The temporal fidelity of marine sediment records can be compromised by the differential transport of various sedimentary components.
  • Alkenone-based paleoclimate reconstructions may require careful consideration of potential age offsets due to particle transport.
  • The geographic fidelity of paleoenvironmental records derived from mobile sedimentary components needs further investigation.