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Imprint of North-Atlantic abrupt climate changes on western European loess deposits as viewed in a dust emission model.pdf
Quaternary Science Reviews 28 (2009) 2851–2866
Contents lists available at ScienceDirect
Quaternary Science Reviews
journal homepage: /locate/quascirev
Imprint of North-Atlantic abrupt climate changes on western European loess
deposits as viewed in a dust emission model
Adriana Sima a,b,c,*, Denis-Didier Rousseau b,d, Masa Kageyama a, Gilles Ramstein a, Michael Schulz a, Yves Balkanski a, Pierre Antoine e, Fran?ois Dulac a, Christine Hatte′ a
a Laboratoire des Sciences du Climat et de l’Environnement, UMR CEA-CNRS-UVSQ 1572, CE Saclay, l’Orme des Merisiers, Ba?t. 701, 91191 Gif-sur-Yvette Cedex, France b Ecole Normale Supe′rieure, Laboratoire de Me′te′orologie Dynamique, UMR CNRS 8539, 24 rue Lhomond, 75231 Paris Cedex, France c Universite′ Montpellier II, Institut des Sciences de l’Evolution, UMR 5554, place Euge`ne Bataillon, 34095 Montpellier Cedex 5, France d Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA e Laboratoire de Ge′ographie Physique, UMR CNRS 8591, CNRS, place A. Briand, 92158 Meudon, France
article info
Article history: Received 3 November 2008 Received in revised form 11 June 2009 Accepted 27 July 2009
abstract
Western European loess sequences of the last glaciation (w100,000–15,000 years BP) exhibit strong, cyclic variations of the sedimentation rate, which are coeval to the Greenland stadial/interstadial cycles and the Heinrich events. These North-Atlantic rapid climate changes appear, thus, as a potential cause for the sedimentation variations, via changes in dust intensity cycle. Here we make a ?rst step in testing this hypothesis, by modelling the impact of the North-Atlantic abrupt climate variations on dust emission. Our dust emission calculations use meteorological ?elds generated by the LMDZ atmospheric general circulation model at a resolution down to 60 km over Western Europe. Three numerical experiments are run, representing a Greenland stadial, an interstadial and a Heinrich event. Orbital parameters an
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