Mie–Raman–fluorescence lidar observations of aerosols during pollen season in the north of France
<p>The multiwavelength Mie–Raman–fluorescence lidar of the University of Lille has the capability to measure three aerosol backscattering coefficients, two extinction coefficients and three linear depolarization ratios, together with fluorescence backscattering at 466 nm. It was used to charac...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2021-07-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/14/4773/2021/amt-14-4773-2021.pdf |
| Summary: | <p>The multiwavelength Mie–Raman–fluorescence lidar of the University of Lille has the
capability to measure three aerosol backscattering coefficients, two extinction
coefficients and three linear depolarization ratios, together with
fluorescence backscattering at 466 nm. It was used to characterize aerosols
during the pollen season in the north of France for the period March–June
2020. The results of observations demonstrate that the presence of pollen
grains in aerosol mixture leads to an increase in the depolarization ratio.
Moreover, the depolarization ratio exhibits a strong spectral dependence
increasing with wavelength, which is expected for the mixture containing
fine background aerosols with low depolarization and strongly depolarizing
pollen grains. A high depolarization ratio correlates with the enhancement of
the fluorescence backscattering, corroborating the presence of pollen
grains. Obtained results demonstrate that simultaneous measurements of
particle depolarization and fluorescence allows for the separation of dust, smoke
particles and aerosol mixtures containing the pollen grains.</p> |
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| ISSN: | 1867-1381 1867-8548 |