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

Luca Lanci; B. Delmonte; V. Maggi; Jean-Robert Petit; Dennis V. Kent

Title:
Ice magnetization in the EPICA-Dome C ice core: Implication for dust sources during glacial and interglacial periods
Author(s):
Lanci, Luca
Delmonte, B.
Maggi, V.
Petit, Jean-Robert
Kent, Dennis V.
Date:
Type:
Articles
Department:
Lamont-Doherty Earth Observatory
Volume:
113
Permanent URL:
Book/Journal Title:
Journal of Geophysical Research
Abstract:
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.
Subject(s):
Geophysics
Atmospheric sciences
Publisher DOI:
http://dx.doi.org/10.1029/2007JD009678
Item views:
108
Metadata:
text | xml

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