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The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

Olivier Moine; Pierre Antoine; Christine Hatté; Amaëlle Landais; Jérôme Mathieu; Charlotte Prud’homme; Denis-Didier Rousseau

Title:
The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules
Author(s):
Moine, Olivier
Antoine, Pierre
Hatté, Christine
Landais, Amaëlle
Mathieu, Jérôme
Prud’homme, Charlotte
Rousseau, Denis-Didier
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
114
Persistent URL:
Book/Journal Title:
Proceedings of the National Academy of Sciences
Geographic Area:
Rhine River Valley
Abstract:
The characterization of Last Glacial millennial-timescale warming phases, known as interstadials or Dansgaard–Oeschger events, requires precise chronologies for the study of paleoclimate records. On the European continent, such chronologies are only available for several Last Glacial pollen and rare speleothem archives principally located in the Mediterranean domain. Farther north, in continental lowlands, numerous high-resolution records of loess and paleosols sequences show a consistent environmental response to stadial–interstadial cycles. However, the limited precision and accuracy of luminescence dating methods commonly used in loess deposits preclude exact correlations of paleosol horizons with Greenland interstadials. To overcome this problem, a radiocarbon dating protocol has been developed to date earthworm calcite granules from the reference loess sequence of Nussloch (Germany). Its application yields a consistent radiocarbon chronology of all soil horizons formed between 47 and 20 ka and unambiguously shows the correlation of every Greenland interstadial identified in isotope records with specific soil horizons. Furthermore, eight additional minor soil horizons dated between 27.5 and 21 ka only correlate with minor decreases in Greenland dust records. This dating strategy reveals the high sensitivity of loess paleoenvironments to Northern Hemisphere climate changes. A connection between loess sedimentation rate, Fennoscandian ice sheet dynamics, and sea level changes is proposed. The chronological improvements enabled by the radiocarbon “earthworm clock” thus strongly enhance our understanding of loess records to a better perception of the impact of Last Glacial climate changes on European paleoenvironments.
Subject(s):
Paleoclimatology
Paleopedology
Climatic changes
Radiocarbon dating
Publisher DOI:
https://doi.org/10.1073/pnas.1614751114
Item views
13
Metadata:
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Suggested Citation:
Olivier Moine, Pierre Antoine, Christine Hatté, Amaëlle Landais, Jérôme Mathieu, Charlotte Prud’homme, Denis-Didier Rousseau, , The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules, Columbia University Academic Commons, .

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