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Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the Late Glacial in Central Europe

Le Roux, Gaël and Fagel, Nathalie and De Vleeschouwer, François and Krachler, Michael and Debaille, Vinciane and Stille, Peter and Mattielli, Nadine and Van der Knaap, Willem O. and Van Leeuwen, Jacqueline F.N. and Shotyk, William Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the Late Glacial in Central Europe. (2012) Geology, 40 (4). 335-338. ISSN 0091-7613

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Official URL: http://dx.doi.org/10.1130/G32586.1

Abstract

Atmospheric dusts are an important part of the global climate system, and play an important role in the marine and terrestrial bio- geochemical cycles of major and trace nutrient elements. A peat bog record of atmospheric deposition shows considerable variation in dust deposition during the past 15 k.y., with abrupt changes in fluxes at 12, 9.2, 8.4, 7.2, and 6 cal. kyr B.P. Using Nd isotopes and rare earth elements, it is possible to clearly distinguish between volcanic inputs and those driven by climate change, such as the long-term aridification of the Sahara and regional erosion due to forest clearing and soil cultivation activities. Our results indicate that a major dust event in North Africa and Europe preceded the 8.2 kyr B.P. cold event by 200 yr. This dust event may have played an active role in the following climate cooling of the 8.2 kyr B.P. event. Nd isotope evidence also indicates a relatively slow change in dust regime over Europe from 7 to 5 kyr B.P. due to Sahara expansion. These fi ndings show that the inorganic fraction in high-resolution peat records can provide remarkably sensitive indicators of dust load and sources. Our study supports the priority to better identify the impact of dust loading during the Holocene in terms of direct and indirect impacts on environmental and climate changes.

Item Type:Article
HAL Id:hal-00915750
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Universität Heidelberg (GERMANY)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Université de Strasbourg - UNISTRA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Liège (BELGIUM)
Other partners > Université Libre de Bruxelles - ULB (BELGIUM)
Other partners > University of Bern (SWITZERLAND)
Laboratory name:
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Deposited By: Gael Le Roux
Deposited On:21 Nov 2013 13:42

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