ORBi: Le Roux Gael - Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the Late Glacial in Central Europe

Reference : Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the Lat...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/115981

Title :	Volcano- and climate-driven changes in atmospheric dust sources and fluxes since the Late Glacial in Central Europe
Language :	English
Author, co-author :	Le Roux, Gael [ > > ]
	Fagel, Nathalie [Université de Liège - ULg > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
	De Vleeschouwer, François [ > > ]
	Krachler, Mickael [ > > ]
	Debaille, Vinciane [ > > ]
	Stille, Peter [ > > ]
	Mattielli, Nadine [Université de Liège - ULg > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
	van der Knaap, Pieter [ > > ]
	van Leeuwen, Jacqueline [ > > ]
	Shotyk, William [Université de Liège - ULg > Département de géologie > Argiles, géochimie et environnements sédimentaires >]
Publication date :	2012
Journal title :	Geology
Publisher :	Geological Society of America
Audience :	International
ISSN :	0091-7613
City :	Boulder
Country :	CO
Keywords :	[en] peatbog ; geochemistry ; climate ; dust ; holocene
Abstract :	[en] 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 ﬂ uxes at 12, 9.2, 8.4, 7.2, and 6 cal. kyr B.P. Using Nd isotopes and rare earth ele- ments, it is possible to clearly distinguish between volcanic inputs and those driven by climate change, such as the long-term aridiﬁ cation of the Sahara and regional erosion due to forest clearing and soil cultiva- tion 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 frac- tion 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.
Research units :	AGEs, Geosciences
Funders :	ULg Patrimoine, mandat post-doctorants ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/115981

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