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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod
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Improving North Atlantic Marine Core Chronologies Using 230Th Normalization.

L Missiaen1,2, C Waelbroeck1, S Pichat3,1,4

  • 1Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ-Université Paris Saclay Gif-sur-Yvette France.

Paleoceanography and Paleoclimatology
|October 11, 2019
PubMed
Summary
This summary is machine-generated.

Establishing accurate marine sediment chronologies is vital for understanding past climate events. This study refines dating methods for North Atlantic records, improving correlations with Greenland ice cores during key glacial periods.

Keywords:
North Atlantic marine chronologiesTh normalization

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Area of Science:

  • Paleoclimatology
  • Marine Geology
  • Geochronology

Background:

  • Accurate marine sediment chronologies are essential for understanding millennial-scale climate events and inter-regional correlations.
  • Radiocarbon (14C) dating is limited in the North Atlantic due to variable reservoir ages, complicating direct calendar age derivation.
  • Aligning marine records with Greenland ice cores is challenging due to a lack of distinct climatic events between 14.7 and 23.3 cal ky BP.

Purpose of the Study:

  • To assess the utility of 230Th normalization for refining sedimentation rates between tie points.
  • To re-evaluate and improve the chronologies of three North Atlantic marine sediment records.
  • To establish robust chronological correlations between marine and ice core records during critical climate transitions.

Main Methods:

  • Application of 230Th normalization to marine sediment cores.
  • Comparison of marine sea surface temperature records with Greenland ice core chemistry (Ca2+).
  • Statistical analysis to determine dating uncertainties and correlations.

Main Results:

  • 230Th normalization aids in refining sedimentation history.
  • A significant Greenland Ca2+ increase at 17.48 ± 0.21 ky aligns with North Atlantic sea surface temperature cooling.
  • This alignment coincides with the onset of Heinrich Stadial 1, providing a potential chronostratigraphic marker.

Conclusions:

  • The Greenland Ca2+ record serves as a reliable marker for aligning North Atlantic marine chronologies.
  • This improves chronological constraints for the period between 14.7 and 23.3 ka, addressing limitations of 14C dating.
  • Enhanced chronostratigraphic alignment facilitates a better understanding of millennial-scale climate dynamics and inter-hemispheric linkages.