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AGU: Journal of Geophysical Research, Atmospheres

 

Keywords

  • Atmospheric dust
  • ice magnetization
  • insoluble dust

Index Terms

  • Atmospheric Composition and Structure: Aerosols and particles
  • Atmospheric Composition and Structure: Constituent sources and sinks
  • Cryosphere: Ice cores
  • Geomagnetism and Paleomagnetism: Environmental magnetism
  • Geomagnetism and Paleomagnetism: Rock and mineral magnetism
Abstract
Cited By (4)
 

Abstract

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 113, D14207, 7 PP., 2008
doi:10.1029/2007JD009678

Ice magnetization in the EPICA-Dome C ice core: Implication for dust sources during glacial and interglacial periods

L. Lanci

Istituto di Scienze della Terra, Università di Urbino, Urbino, Italy

B. Delmonte

Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano-Bicocca, Milano, Italy

V. Maggi

Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano-Bicocca, Milano, Italy

J. R. Petit

Laboratoire de Glaciologie et Geophysique de l'Environnement (CNRS), Saint Martin d'Héres Cedex, France

D. V. Kent

Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey, USA

Lamont-Doherty Earth Observatory, Palisades, New York, USA

Isothermal remanent magnetization and insoluble dust content of ice samples from EPICA-Dome C ice core were measured to characterize the magnetic properties of atmospheric dust. Despite the larger concentration of dust aerosol during glacial stages, the magnetization of the dust fraction was found to be higher during interglacials and exhibits a larger variability. Changes in magnetic mineralogy of aerosol dust in ice from different climatic stages were also characterized using coercivity of remanence. Variations of magnetic properties of dust from glacial to interglacial stages indicate changes in dust provenance, in agreement with previous results based on geochemical analysis. However, the extremely large magnetizations of some interglacial samples also suggest that episodical eolian deposition from highly magnetic deposits occurred during interglacial periods.

Received 5 December 2007; accepted 17 March 2008; published 19 July 2008.

Citation: Lanci, L., B. Delmonte, V. Maggi, J. R. Petit, and D. V. Kent (2008), Ice magnetization in the EPICA-Dome C ice core: Implication for dust sources during glacial and interglacial periods, J. Geophys. Res., 113, D14207, doi:10.1029/2007JD009678.

Cited By

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