The possible role of magnetic measurements in the discrimination of Sahara/Sahel dust sources

DOI Web Site Web Site 被引用文献1件
  • Richard Lyons
    School of Environmental Sciences University of Liverpool Liverpool UK
  • Frank Oldfield
    School of Environmental Sciences University of Liverpool Liverpool UK
  • Earle Williams
    Parsons Laboratory Massachusetts Institute of Technology Cambridge MA USA

書誌事項

公開日
2011-12-23
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/esp.2268
公開者
Wiley

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<jats:title>ABSTRACT</jats:title><jats:p>The mineral magnetic properties of deposited dusts collected along a broadly north‐to‐south transect across Niger have been investigated on both a bulk and particle size‐specific basis. Dusts display a general north‐to‐south gradient in fine‐grained ferrimagnetic mineral (magnetite/maghemite) concentrations, with samples south of the Sahara/Sahel transition (south of ~15·5<jats:sup>o</jats:sup> N) generally containing greater concentrations than dusts from further north where the climate is much drier. This distinction is seen especially clearly in the clay (< 2 µm) fraction, which harbours the products of weathering and pedogenesis. This gradient in ferrimagnetic mineral concentrations broadly parallels that previously reported for surface soils/sands across a similar latitudinal range. We suggest that the regional distinction in both dust and surface soil/sand magnetic properties can be related to differences in weathering regime between the arid Saharan parts of the transect and the Sahel sites where higher rainfall has permitted stronger weathering and pedogenesis. Given that the weathering‐related magnetic signatures in the clays dominate the magnetic properties of the < 16 µm fractions in these samples, and that this particle size component is most likely to be involved in long‐range transport, magnetic measurements hold out the potential of discriminating Sahara and Sahel dusts deposited in remote areas. Copyright © 2011 John Wiley & Sons, Ltd.</jats:p>

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