Preprints
https://doi.org/10.5194/acp-2021-608
https://doi.org/10.5194/acp-2021-608

  30 Jul 2021

30 Jul 2021

Review status: this preprint is currently under review for the journal ACP.

First triple-wavelength lidar observations of depolarization and extinction-to-backscatter ratios of Saharan dust

Moritz Haarig1, Albert Ansmann1, Ronny Engelmann1, Holger Baars1, Dietrich Althausen1, Carlos Toledano2, Benjamin Torres3, Martin Radenz1, and Ulla Wandinger1 Moritz Haarig et al.
  • 1Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 2Atmospheric Optics Group, University of Valladolid, Valladolid, Spain
  • 3Laboratoire d’Optique Atmosphérique, Université des Sciences et Technologies de Lille, Villeneuve d’Ascq, France

Abstract. Two Saharan dust layers observed over Leipzig in February and March 2021 were used to provide the first ever lidar measurements of the extinction coefficient at 1064 nm for desert dust. The advanced multiwavelength Raman polarization lidar was able to provide, for the first time, the lidar ratio (extinction-to-backscatter ratio) and particle linear depolarization ratio at all three classical lidar wavelengths (355, 532 and 1064 nm). The pure dust conditions during the first event exhibit lidar ratios of 47±8, 50±5 and 63±13 sr and particle linear depolarization ratios of 0.260±0.026, 0.298±0.017 and 0.214±0.025 at the wavelengths of 355, 532 and 1064 nm, respectively. The second, slightly polluted dust case shows a similar spectral behavior with values of the lidar ratio of 52±8, 47±5 and 61±10 sr and the depolarization ratio of 0.188±0.053, 0.270±0.017 and 0.242±0.007 at 355, 532 and 1064 nm, respectively. The results were compared to AERONET v3 inversions and GRASP retrievals at six and seven wavelengths, which could reproduce the spectral slope of the lidar ratio from 532 to 1064 nm. The spectral slope of the particle linear depolarization ratio could not be reproduced by the AERONET inversions, especially at 1064 nm.

Moritz Haarig et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-608', Anonymous Referee #1, 30 Aug 2021
  • RC2: 'Comment on acp-2021-608', Mark Vaughan, 30 Aug 2021
  • RC3: 'Comment on acp-2021-608', Oleg Dubovik, 31 Aug 2021

Moritz Haarig et al.

Moritz Haarig et al.

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Short summary
The irregular shape of the dust particles makes it difficult to treat them correctly in optical models. Atmospheric measurements of the dust optical properties are therefore of great importance. The present study increases the space of observed parameters from 355 and 532 nm towards 1064 nm, which is of special importance for the large dust particles. The lidar ratio influenced by mineralogy and the depolarization ratio influenced by shape are measured for the first time at all 3 wavelengths.
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