Authors present results of high quality measurements of the fluorescence spectra in a wide range of height, up to the lower stratosphere. Main focus is done on the study of BBA and several important findings are presented, such as the red shift of fluorescence spectrum of BBA with height and blue shift in the clouds. The results presented are unique and are suitable for publishing in ACP. Manuscript is very well written and, in principle, can be published as it is.

I have just several minor comments.

The fluorescence lidar with several discreet channels can provide only rough estimate of the spectrum. Still red shift of BBA spectrum with height, as well as difference between spectra of BBA  and the boundary layer aerosol was reported recently. So it should be cited.

Veselovskii, I., Korenskiy, M., Kasianik, N., Barchunov, B., Hu, Q., Goloub, P., and Podvin, T.: Fluorescence properties of long-range transported smoke: Insights from five-channel lidar observations over Moscow during the 2023 wildfire season, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2024-2874, 2024.

Ln. 264. “In any case, at such low lidar ratios it can be ruled out that the BBA particles absorbed significantly.”

But normally high lidar ratios are associated with strong absorption.

Fig.14a presents temperature as a function of wavelength. I am confused. The plot can also be done for height (instead temperature), for example. Dependence will be probably similar. Why temperature is taken as a primary variable?  The same in Fig.16: depolarization is plotted as function of central wavelength. Both parameters increase with height, but does it mean that parameters depend on each other?

I am confused also with central plot in Fig.16: central wavelength vs central wavelength. What does it mean?

Fig.20 “(center altitudes indicated in Fig. 19)”. Would be more convenient to have altitudes at Fig.20 also.

Please refer to the PDF file in the supplement.