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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2019-122
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-122
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 01 Oct 2019

Submitted as: research article | 01 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

DO-like events of the penultimate climate cycle: the loess point of view

Denis-Didier Rousseau1,2, Pierre Antoine3, Niklas Boers4, France Lagroix5, Michael Ghil1,6, Johanna Lomax7, Markus Fuchs7, Maxime Debret8, Christine Hatté9, Olivier Moine3, Caroline Gauthier9, Diana Jordanova10, and Neli Jordanova10 Denis-Didier Rousseau et al.
  • 1Ecole Normale Supérieure, Laboratoire de Météorologie Dynamique, UMR8539 CNRS, Paris cedex 05, France
  • 2Lamont Doherty Earth Observatory, Columbia University, NewYork, USA
  • 3Laboratoire de Géographie Physique, Environnements quaternaires et actuels, CNRS, Meudon, France
  • 4Potsdam Institute for Climate Impact Research, Potsdam, Germany
  • 5Institut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, UMR7154 CNRS, Paris, France
  • 6Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095-1565, USA
  • 7Department of Geography, Justus-Liebig-Universität Gießen, Gießen, Germany
  • 8Normandie University, UNIROUEN, UNICAEN, CNRS, M2C, Rouen, France
  • 9Laboratoire des Sciences du Climat et de l'Environnement, Université Paris-Saclay, Gif-sur-Yvette, France
  • 10National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 3, 1113, Sofia, Bulgaria

Abstract. The global character of the millennial-scale climate variability associated with the Dansgaard-Oeschger (DO) events in Greenland has been well-established for the last glacial cycle. Mainly due to the sparsity of reliable data, however, the spatial coherence of corresponding variability during the penultimate cycle is less clear. New investigations of European loess records from MIS 6 reveal the occurrence of alternating loess intervals and paleosols (incipient soil horizons), similar to those from the last climatic cycle. These paleosols are correlated based on their stratigraphical position and numbers, and available optically stimulated luminescence (OSL) dates with interstadials described in various Northern Hemisphere records as well as in GLt_syn, the synthetic 800-kyr record of Greenland ice core δ18O. Therefore, referring to the interstadials described in the record of the last climate cycle in European loess sequences, the MIS 6 interstadials can confidently be interpreted as DO-like events of the penultimate climate cycle. The statistical similarity between the millennial-scale loess-paleosol oscillations during the last and penultimate climate cycle provides direct empirical evidence that the cycles of the penultimate cycle are indeed of the same nature as the DO cycles originally discovered for the last glacial cycle. Our results thus imply that their underlying cause and global imprint was characteristic of at least the last two climate cycles.

Denis-Didier Rousseau et al.
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Status: open (until 26 Nov 2019)
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Denis-Didier Rousseau et al.
Data sets

High resolution (5 cm) continuous record of grain size and magnetic susceptibility of the 20 m thick loess palaeosol sequence of Harletz, Bulgaria. https://doi.pangaea.de/ P. Antoine https://doi.pangaea.de/10.1594/PANGAEA.905216

High resolution continuous record of color (a*) of the 20 m thick loess palaeosol sequence of Harletz, Bulgaria. https://doi.pangaea.de/ P. Antoine https://doi.pangaea.de/10.1594/PANGAEA.905214

Denis-Didier Rousseau et al.
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Short summary
New investigations of European loess records from MIS 6 reveal the occurrence of paleosols and horizon showing slight pedogenesis similar to those from the last climatic cycle. These units are correlated with interstadials described in various marine, continental and ice Northern Hemisphere records. Therefore, these MIS 6 interstadials can confidently be interpreted as DO-like events of the penultimate climate cycle.
New investigations of European loess records from MIS 6 reveal the occurrence of paleosols and...
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