the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Variability in lidar-derived particle properties over West Africa due to changes in absorption: towards an understanding
Igor Veselovskii
Qiaoyun Hu
Philippe Goloub
Thierry Podvin
Mikhail Korenskiy
Yevgeny Derimian
Michel Legrand
Patricia Castellanos
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Measurements of the transported smoke layers in 2023 were performed with a lidar in Lille and a 5-channel fluorescence lidar in Moscow. Results show in boundary layer, the peak of fluorescence is at 438 nm while in smoke layer it shifts to longer wavelengths. The fluorescence depolarization is typically 45% to 55%. The depolarization ratio of the water vapor channel is low (2±0.5%) in the absence of fluorescence and can be used to evaluate the contribution of fluorescence to water vapor signal.
Measurements of the transported smoke layers in 2023 were performed with a lidar in Lille and a 5-channel fluorescence lidar in Moscow. Results show in boundary layer, the peak of fluorescence is at 438 nm while in smoke layer it shifts to longer wavelengths. The fluorescence depolarization is typically 45% to 55%. The depolarization ratio of the water vapor channel is low (2±0.5%) in the absence of fluorescence and can be used to evaluate the contribution of fluorescence to water vapor signal.