1Ecole Normale Supérieure, Laboratoire de Météorologie Dynamique & CERES-ERTI, UMR8539, CNRS – 24 rue Lhomond, 75231 Paris cedex 05, France
2Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA
3Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095-1565, & Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA
4Laboratoire de Géographie Physique, UMR8591, CNRS – 1 place Aristide Briand, 92195 Meudon, France
5Department of Geography, Justus-Liebig-University Giessen, 35390 Giessen, Germany
6Laboratoire des Sciences du Climat et de l'Environement, UMR8212, CEA-CNRS-UVSQ – Domaine du CNRS, 91198 Gif-sur-Yvette, France
7Institut de Physique du Globe de Paris, Sorbonne Paris Cité, University Paris Diderot, UMR7154, CNRS – 75005 Paris, France
*now at: Morphodynamique Continentale et Côtière, UMR6143, CNRS – University of Rouen, 76821 Mont-Saint-Aignan Cedex, France
Abstract. At present, major dust storms are occurring at mid-latitudes in the Middle East and Asia, as well as at low latitudes in northern Africa and in Australia. Western Europe, though, does not experience such dramatic climate events, except for some African dust reaching it from the Sahara. This modern situation is of particular interest, in the context of future climate projections, since the present interglacial is usually interpreted, in this context, as an analog of the warm Eemian interval. European terrestrial records show, however, major dust events during the penultimate interglacial and early glacial. These events are easily observed in loess records by their whitish-color deposits, which lie above and below dark chernozem paleosols in Central European records of Marine Isotope Stage (MIS) 5 age.
We describe here the base of the Dolni Vestonice (DV) loess sequence, Czech Republic, as the reference of such records. The dust is deposited during intervals that are characterized by poor vegetation – manifested by high δ13C values and low magnetic susceptibility – while the fine sand and clay in the deposits shows grain sizes that are clearly different from the overlying pleniglacial loess deposits. Some of these dust events have been previously described as "Markers" or Marker Silts (MS) by one of us (G. Kukla), and are dated at about 111–109 and 93–92 ka, with a third and last one slightly visible at about 75–73 ka. Other events correspond to the loess material of Kukla's cycles, and are described as eolian silts (ES); they are observed in the same DV sequence and are dated at about 106–105, 88–86, and 78.5–77 ka.
The fine eolian deposits mentioned above, MS as well as ES, correspond to short events that lasted about 2 ka; they are synchronous with re-advances of the polar front over the North Atlantic, as observed in marine sediment cores. These deposits also correlate with important changes observed in European vegetation. Some ES and MS events appear to be coeval with significant dust peaks recorded in the Greenland ice cores, while others are not. This decoupling between the European eolian and Greenland dust depositions is of considerable interest, as it differs from the fully glacial situation, in which the Eurasian loess sedimentation mimics the Greenland dust record. Previous field observations supported an interpretation of MS events as caused by continental dust storms. We show here, by a comparison with speleothems of the same age found in the northern Alps, that different atmospheric-circulation modes seem to be responsible for the two categories of dust events, MS vs. ES.