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Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-67
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 May 2017
Review status
This discussion paper is under review for the journal Climate of the Past (CP).
Eurasian contribution to the last glacial dust cycle: how are loess sequences built?
Denis-Didier Rousseau1,2, Anders Svensson3, Matthias Bigler4, Adriana Sima1, Jorgen Peder Steffensen3, and Niklas Boers1 1Ecole Normale Supérieure, UMR CNRS 8539, Laboratoire de Météorologie Dynamique, and CERES-ERTI, 24 rue Lhomond, 75231 Paris cedex 5, France
2Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA
3Centre for Ice and Climate Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen OE, Denmark
4University of Bern, Physics Institute, Climate and Environment Physics, Sidlerstrasse 5, 3012 Bern, Switzerland
Abstract. The last 130 000 years have been marked by pronounced millennial scale climate variability, which strongly impacted the terrestrial environments of the Northern Hemisphere especially at middle latitudes. Identifying the trigger of these variations, which are most likely associated with strong couplings between the ocean and the atmosphere, still remains a key question. Here, we show that the analysis of δ18O and dust in the Greenland ice cores, and a critical study of their source variations, reconciles these records with those observed on the Eurasian continent. We demonstrate the link between European and Chinese loess sequences, dust records in Greenland, and variations of the North Atlantic sea ice extent. The sources of the emitted and transported dust material are variable and relate to different environments corresponding to present desert areas, but also hidden regions related to lower sea level stands, dry rivers, or zones close to the frontal moraines of the main Northern Hemisphere ice sheets. We anticipate our study to be at the origin of more sophisticated and elaborated investigations of millennial and sub-millennial continental climate variability on the Northern Hemisphere.

Citation: Rousseau, D.-D., Svensson, A., Bigler, M., Sima, A., Steffensen, J. P., and Boers, N.: Eurasian contribution to the last glacial dust cycle: how are loess sequences built?, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-67, in review, 2017.
Denis-Didier Rousseau et al.
Denis-Didier Rousseau et al.
Denis-Didier Rousseau et al.

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We show that the analysis of δ18O and dust in the Greenland ice cores, and a critical study of their source variations, reconciles these records with those observed on the Eurasian continent. We demonstrate the link between European and Chinese loess sequences, dust records in Greenland, and variations of the North Atlantic sea ice extent. The sources of the emitted and transported dust material are variable and relate to different environments.
We show that the analysis of δ18O and dust in the Greenland ice cores, and a critical study of...
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