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Title: Aerosol particle depolarization ratio at 1565 nm measured with a Halo Doppler lidar
Authors: Vakkari, Ville 
Baars, Holger 
Bohlmann, Stephanie 
Bühl, Johannes 
Komppula, Mika 
Mamouri, Rodanthi-Elisavet 
O'Connor, Ewan James 
Major Field of Science: Natural Sciences
Field Category: Earth and Related Environmental Sciences
Keywords: Aerosol;Coniferous tree;Deciduous tree;Doppler lidar;Measurement method;Polarization;Pollen
Issue Date: 19-Apr-2021
Source: Atmospheric Chemistry and Physics, 2021, vol. 21, no. 8, pp. 5807 - 5820
Volume: 21
Issue: 8
Start page: 5807
End page: 5820
Journal: Atmospheric Chemistry and Physics 
Abstract: The depolarization ratio is a valuable parameter for lidar-based aerosol categorization. Usually, the 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 StreamLine Doppler lidars to retrieve the particle linear depolarization ratio at the 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 slightly lower depolarization ratio at 1565 nm than at 355 and 532 nm. However, for dust mixed with other aerosol we find a higher depolarization ratio at 1565 nm. For polluted marine aerosol we find a marginally lower depolarization ratio at 1565 nm compared to 355 and 532 nm. For mixed spruce and birch pollen we find a slightly higher depolarization ratio at 1565 nm compared to 532 nm. Overall, we conclude that Halo Doppler lidars can provide a particle linear depolarization ratio at the 1565 nm wavelength at least in the lowest 2-3 km above ground.
ISSN: 1680-7324
DOI: 10.5194/acp-21-5807-2021
Rights: © Author(s)
Attribution-NonCommercial-NoDerivatives 4.0 International
Type: Article
Affiliation : Finnish Meteorological Institute 
North-West University 
Leibniz Institute for Tropospheric Research 
Finnish Meteorological Institute 
University of Eastern Finland 
Cyprus University of Technology 
ERATOSTHENES Centre of Excellence 
University of Reading 
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