Fig. 1. Schematic of lidar system structure

Fig. 2. Data comparison before and after wavelet denoising. (a) Before denoising; (b) after denoising

Fig. 3. Comparison of ozone mass concentration profiles retrieved by different differential resolutions and wavelength algorithms. (a) Different differential resolutions; (b) different wavelengths

Fig. 4. Aerosol extinction coefficient and O₃ mass concentration error generated by atmospheric interference term. (a) Aerosol extinction coefficient at 396 nm at different moments; (b) O₃ mass concentration error of atmospheric backscattering term; (c) O₃ mass concentration error of aerosol extinction term; (d) O₃ mass concentration error of atmospheric molecular extinction term

Fig. 5. O₃ and aerosol inversion results at night. (a) O₃ mass concentration profile; (b) aerosol extinction coefficient at 396 nm; (c) aerosol extinction coefficient without O₃ absorption coefficient; (d) absolute error of extinction coefficient

Fig. 6. Inversion results of UV multi-wavelength lidar. (a) O₃ mass concentration; (b) aerosol extinction coefficient

Fig. 7. Changes of O₃ mass concentration at 300 m and aerosol optical depth (AOD)

Fig. 8. Air mass backward trajectories among 24h. (a) 21:00 on 15th December; (b) 12:00 on 16th December

Fig. 9. O₃ mass mixing ratio obtained by MERRA-2 at 975 hPa in the Wangdu area. (a) On 15th December; (b) on 16th December