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. To study the feasibility of a fluorescence lidar for aerosolcharacterization, the fluorescence channel is added to the LILASmultiwavelength Mie–Raman lidar of Lille University, France. A part ofthe fluorescence spectrum induced by 355 nm laser radiation is selected by the interference filter of 44 nm bandwidth centered at 466 nm. Such an approachhas proved to have high sensitivity, allowing fluorescence signals fromweak aerosol layers to be detected and the fluorescence backscatteringcoefficient from the ratio of fluorescence and nitrogen Raman backscatters to be calculated.Observations were performed during the November 2019–February 2020 period.The fluorescence capacity (ratio of fluorescence to elastic backscatteringcoefficients), measured under conditions of low relative humidity, varied ina wide range, being the highest for the smoke and the lowest for the dustparticles. The results presented also demonstrate that the fluorescencemeasurements can be used for monitoring the aerosol inside the cloud layers.

Combined use of Mie–Raman and fluorescence lidar observations for improving aerosol characterization: feasibility experiment