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

• Published in: Journal of Geophysical Research
• Main Authors: Lanci, L., Delmonte, Barbara, Maggi, V., Petit, Jean-Robert, Kent, D.V.
• Other Authors: Istituto di Scienze della Terra, Università di Urbino, Dipartimento di Scienze dell'Ambiente e del Territorio (DISAT), Università degli Studi di Milano Milano (UNIMI), Laboratoire de glaciologie et géophysique de l'environnement (LGGE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS), Department of Earth and Planetary Sciences Piscataway, Rutgers, The State University of New Jersey New Brunswick (RU), Rutgers University System (Rutgers)-Rutgers University System (Rutgers), Lamont-Doherty Earth Observatory (LDEO), Columbia University New York, European Project for Ice Coring in Antarctica (EPICA)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2008
• Subjects: Atmospheric dust; ice magnetization; insoluble dust; [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology; EPICA; ice core
• Online Access: https://hal-insu.archives-ouvertes.fr/insu-00378534; https://hal-insu.archives-ouvertes.fr/insu-00378534/document; https://hal-insu.archives-ouvertes.fr/insu-00378534/file/2007JD009678.pdf; https://doi.org/10.1029/2007JD009678

International audience 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.