CPD Climate of the Past Discussions CPD 1814-9359 Copernicus GmbH Göttingen, Germany 10.5194/cpd-8-2921-2012 Tracking atmospheric and riverine terrigenous supplies variability during the last glacial and the Holocene in central Mediterranean Bout-Roumazeilles V. 1 Combourieu-Nebout N. 2 Desprat S. 3 Siani G. 4 Turon J.-L. 5 Géosystèmes, UMR8217, CNRS – Université Lille 1, 59655 Villeneuve d'Ascq, France Laboratoire des Sciences du Climat et de l'Environnement, laboratoire Mixte CNRS-CEA-UVSQ, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France Ecole Pratique des Hautes Etudes, Environnements et Paléoenvironnements Océaniques, UMR5808, CNRS – EPOC, Université Bordeaux I, 33405 Talence, France Laboratoire des Interactions et Dynamique des Environnements de Surface (IDES), UMR8148, CNRS – Université de Paris-Sud, Bât 504, 91405 Orsay Cedex, France Environnements et Paléoenvironnements Océaniques, UMR5808, CNRS – EPOC, Université Bordeaux I, 33405 Talence, France 27 07 2012 8 4 2921 2968 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.clim-past-discuss.net/8/2921/2012/cpd-8-2921-2012.html The full text article is available as a PDF file from http://www.clim-past-discuss.net/8/2921/2012/cpd-8-2921-2012.pdf

The objectives were to retrace the eolian and fluvial terrigenous supplies in a sediment core from the Sicilian-Tunisian Strait by coupling mineralogical, grain-size and geochemical approaches, in order to get informations on the atmospheric versus riverine contributions to sedimentation on the southern side of central Mediterranean since the last glacial. The eolian supply is dominant over the whole interval, excepted during the sapropel S1 when riverine contribution apparently became significant, and particles provenance has been modified since Last Glacial. Saharan contribution increased during the Bølling-Allerød, evidencing the persistence of aridity over North Africa although the northern Mediterranean already experienced moister and warmer conditions. The Younger Dryas is marked by proximal dust inputs highlighting intense regional eolian activity. A southward migration of dust provenance toward Sahel occurred at the onset of the Holocene, likely resulting from a southward position of the Inter Tropical Convergence Zone, probably associated with a large-scale atmospheric reorganization. Finally, a peculiar high terrigenous flux associated with drastic modifications of the mineralogical and geochemical sediment signature occurred during the sapropel S1, suggesting the propagation of fine-particles derived from major floodings of the Nile River – resulting from enhanced rainfall on northeastern Africa – and their transportation across the Sicilian-Tunisian Strait by intermediate water-masses.

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