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https://doi.org/10.5194/acp-2020-906
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-906
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  23 Oct 2020

23 Oct 2020

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This preprint is currently under review for the journal ACP.

Aerosol particle depolarization ratio at 1565 nm measured with a Halo Doppler lidar

Ville Vakkari1,2, Holger Baars3, Stephanie Bohlmann4, Johannes Bühl3, Mika Komppula4, Rodanthi-Elisavet Mamouri5,6, and Ewan James O'Connor1,7 Ville Vakkari et al.
  • 1Finnish Meteorological Institute, Helsinki, FI-00101, Finland
  • 2Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, South Africa
  • 3Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 4Finnish Meteorological Institute, Kuopio, FI-70211, Finland
  • 5Department of Civil Engineering and Geomatics, Cyprus University of Technology, Limassol, Cyprus
  • 6ERATOSTHENES Centre of Excellence, Limassol, Cyprus
  • 7Department of Meteorology, University of Reading, Reading, UK

Abstract. Depolarization ratio is a valuable parameter for lidar-based aerosol categorization. Usually, aerosol particle depolarization ratio is determined at relatively short wavelengths of 355 nm and/or 532 nm, but some multi-wavelength studies including longer wavelengths indicate strong spectral dependency. Here, we investigate the capabilities of Halo Photonics Stream Line Doppler lidars to retrieve the particle linear depolarization ratio at 1565 nm wavelength. We utilize collocated measurements with another lidar system, PollyXT at Limassol, Cyprus, and at Kuopio, Finland, to compare the depolarization ratio observed by the two systems. For mineral dust-dominated cases we find typically a little lower depolarization ratio at 1565 nm than at 355 nm and 532 nm. However, for dust mixed with other aerosol we find higher depolarization ratio at 1565 nm. For polluted marine aerosol we find marginally lower depolarization ratio at 1565 nm compared to 355 nm and 532 nm. For mixed spruce and birch pollen we find a little higher depolarization ratio at 1565 nm compared to 532 nm. Overall, we conclude that Halo Doppler lidars can provide particle linear depolarization ratio at 1565 nm wavelength at least in the lowest 2–3 km above ground.

Ville Vakkari et al.

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Short summary
Depolarization ratio is a valuable parameter for aerosol categorization from remote sensing measurements. Here, we introduce particle depolarization ratio measurements at 1565 nm wavelength, which is substantially longer than previously utilised wavelengths and enhances our capabilities to study wavelength dependency of particle depolarization ratio.
Depolarization ratio is a valuable parameter for aerosol categorization from remote sensing...
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