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Updated: Jul 19, 2025

Improving Infrared Spectroscopy Characterization of Soil Organic Matter with Spectral Subtractions
Published on: January 10, 2019
Infrared optical signature reveals the source-dependency and along-transport evolution of dust mineralogy as shown by
Claudia Di Biagio1, Jean-François Doussin2, Mathieu Cazaunau2
1Université Paris Cité and Univ Paris Est Creteil, CNRS, LISA, F-75013, Paris, France. claudia.dibiagio@lisa.ipsl.fr.
Abstract:
Advancing knowledge of the mineralogical composition of dust is key for understanding and predicting its climate and environmental impacts. The variability of dust mineralogy from one source to another and its evolution during atmospheric transport is not measured at large scale. In this study we use laboratory measurements to demonstrate that the extinction signature of suspended dust aerosols in the 740 - 1250 cm-1 atmospheric window can be used to derive dust mineralogy in terms of the main infrared - active minerals, namely quartz, clays, feldspars and calcite. Various spectral signatures in dust extinction enable to distinguish between multiple global sources with changing composition, whereas modifications of the dust extinction spectra with time inform on size - dependent particles mineralogy changes during transport. The present study confirms that spectral and hyperspectral infrared remote sensing observations offer great potential for elucidating the size - segregated mineralogy of airborne dust at regional and global scales.
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