Articles | Volume 16, issue 2
https://doi.org/10.5194/amt-16-403-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-16-403-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
24 Jan 2023
Research article |
| 24 Jan 2023
| 24 Jan 2023
Investigating the dependence of mineral dust depolarization on complex refractive index and size with a laboratory polarimeter at 180.0° lidar backscattering angle
University of Lyon, Université Claude Bernard Lyon 1, CNRS,
Institut Lumière Matière, Villeurbanne 69622, France
Danaël Cholleton
University of Lyon, Université Claude Bernard Lyon 1, CNRS,
Institut Lumière Matière, Villeurbanne 69622, France
Clément Noël
University of Lyon, Université Claude Bernard Lyon 1, CNRS,
Institut Lumière Matière, Villeurbanne 69622, France
Patrick Rairoux
University of Lyon, Université Claude Bernard Lyon 1, CNRS,
Institut Lumière Matière, Villeurbanne 69622, France
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Short summary
The depolarization ratio of hematite, silica, Arizona and Asian dust is evaluated in a lab with a π-polarimeter operating at lidar 180 ° and at (355, 532) nm wavelengths. The hematite depolarization equals (10±1) % at 355 nm for coarser particles, while that of silica is (33±1) %. This huge difference is explained by accounting for the high imaginary part of the hematite complex refractive index, thus revealing the key role played by light absorption in mineral dust lidar depolarization.
The depolarization ratio of hematite, silica, Arizona and Asian dust is evaluated in a lab with...
