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Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the late glacial in Central Europe

Gael Le Roux, Nathalie Fagel, Francois de Vleeschouwer, Michael Krachler, Vinciane Debaille, Peter Stille, Nadine Mattielli, W. O. van der Knaap, Jacqueline F. N. van Leeuwen and William Shotyk
Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the late glacial in Central Europe
Geology (Boulder) (March 2012) 40 (4): 335-338

Abstract

Atmospheric dusts are an important part of the global climate system, and play an important role in the marine and terrestrial biogeochemical 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 findings 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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 4
Title: Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the late glacial in Central Europe
Affiliation: Liege University, Department of Geology, Liege, Belgium
Pages: 335-338
Published: 20120302
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 2012-035898
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012093; accessed on March 22, 2012
Illustration Description: illus. incl. sketch map
Source Medium: WWW
N47°13'60" - N47°15'00", E07°01'60" - E07°02'60"
Secondary Affiliation: University of Heidelberg, DEU, GermanyUniversite Libre de Bruxelles, BEL, BelgiumUniversite de Strasbourg, FRA, FranceUniversity of Bern, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201219
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