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European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling

Denis-Didier Rousseau 1, 2 Catherine Chauvel 3, 4 Adriana Sima 1 Christine Hatté 5, 6 France Lagroix 7 Pierre Antoine 8 Yves Balkanski 5, 9 Markus Fuchs 10 Claire Mellett 11 Masa Kageyama 5, 12 Gilles Ramstein 5, 12 Andreas Lang 13
1 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
2 LDEO - Lamont-Doherty Earth Observatory
3 Laboratoire d'Accidentologie et de Biomécanique
4 ISTerre - Institut des Sciences de la Terre
5 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
6 GEOTRAC - Géochrononologie Traceurs Archéométrie
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
7 IPGP - Institut de Physique du Globe de Paris
8 LGP - Laboratoire de géographie physique : Environnements Quaternaires et Actuels
9 MERMAID - Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
10 Department of Geography, Justus-Liebig- University
11 British Geological Survey [Edinburgh]
12 CLIM - Modélisation du climat
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
13 University of Liverpool
Abstract : For a long time global paleodust numerical simulations have greatly underestimated dust sources other than modern deserts. Recent modeling experiments incorporating glaciogenic sources of dust have positively improved the agreement between model and paleodust data. This highlights the importance of accurately representing all areas potentially subjected to deflation during an investigated interval. Geochemical results, obtained from European loess sequences collected along a 50°N transect, combined with dust emission simulations reveal the geographical distribution of the most important European dust sources between 34 ka and 18 ka. We demonstrate that most European dust traveled only a few hundred kilometers or less within the boundary layer from its source before deposition. We conclude that our results encourage acquisition of similar geochemical data for other relevant areas in the world. Further, they could provide critical constraints to benchmark atmospheric models, contributing to improve their performance in simulating dust cycle and associated climate feedbacks.
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INSU | CNRS | UNIV-PARIS7 | X | OSUG | UPMC | UVSQ | CEA | X-LMD | LSCE | PARISTECH | UPEC-UPEM | UNIV-PARIS1 | ISTERRE | IFSTTAR | UNIV-SAVOIE | ENPC | IRD | X-DEP-MECA | SORBONNE-UNIVERSITE | CAMPUS-CONDORCET | UPEC | LGP | UNIV-PARIS | LSCE-CEA | RIGL | AFRIQ | PSL | UGA | SU-TI | GS-GEOSCIENCES | IPGP

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Denis-Didier Rousseau, Catherine Chauvel, Adriana Sima, Christine Hatté, France Lagroix, et al.. European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling. Geophysical Research Letters, American Geophysical Union, 2014, 41 (21), pp.7666-7674. ⟨10.1002/2014GL061382⟩. ⟨insu-01351686⟩

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