Articles | Volume 17, issue 3
https://doi.org/10.5194/amt-17-921-2024
https://doi.org/10.5194/amt-17-921-2024
Research article
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05 Feb 2024
Research article | Highlight paper |  | 05 Feb 2024

Long-term aerosol particle depolarization ratio measurements with HALO Photonics Doppler lidar

Viet Le, Hannah Lobo, Ewan J. O'Connor, and Ville Vakkari

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Cited articles

Aaltonen, V., Rodriguez, E., Kazadzis, S., Arola, A., Amiridis, V., Lihavainen, H., and De Leeuw, G.: On the variation of aerosol properties over Finland based on the optical columnar measurements, Atmos. Res., 116, 46–55, https://doi.org/10.1016/j.atmosres.2011.07.014, 2012. 
Adams-Groom, B., Emberlin, J., Corden, J., Millington, W., and Mullins, J.: Predicting the start of the birch pollen season at London, Derby and Cardiff, United Kingdom, using a multiple regression model, based on data from 1987 to 1997, Aerobiologia, 18, 117–123, https://doi.org/10.1023/A:1020698023134, 2002. 
Alba, F., De La Guardia, C. D., and Comtois, P.: The effect of meteorological parameters on diurnal patterns of airborne olive pollen concentration, Grana, 39, 200–208, https://doi.org/10.1080/00173130051084340, 2000. 
Baars, H., Seifert, P., Engelmann, R., and Wandinger, U.: Target categorization of aerosol and clouds by continuous multiwavelength-polarization lidar measurements, Atmos. Meas. Tech., 10, 3175–3201, https://doi.org/10.5194/amt-10-3175-2017, 2017. 
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Executive editor
This is the first time showing that long-term polarization observations with a Doppler lidar are possible. Second, the methodology could be applied to other HALO lidars and thus expand the capabilities for observing atmospheric aerosol. Third: It shows that Finland (any maybe whole Scandinavia) is during summer time most of the time dominated by Pollen or other biogenic aerosol, something which is maybe attributed to the continental background class used in CALIPSO, and not yet fully understood.
Short summary
This study offers a long-term overview of aerosol particle depolarization ratio at the wavelength of 1565 nm obtained from vertical profiling measurements by Halo Doppler lidars during 4 years at four different locations across Finland. Our observations support the long-term usage of Halo Doppler lidar depolarization ratio such as the detection of aerosols that may pose a safety risk for aviation. Long-range Saharan dust transport and pollen transport are also showcased here.