review contained in the attached PDF

This is a very interesting study that attempts to investigate an aerosol transport event from different perspectives – perhaps, from almost all possible angles: ground, space, and models.

My main concern is that, in general, the authors should have addressed the possible uncertainties in detail, such as temporal/spatial collocation mismatches, lidar ratio assumptions, and assumptions in the trajectory model. Perhaps it would be helpful to have dedicated sections discussing these uncertainties. I don't mean to suggest that the authors are unaware of these uncertainties. In fact, the later part of the manuscript mentions that future lidar missions/studies would be important. However, that message could be strengthened by a dedicated section on uncertainties.

Additionally, I do not quite understand how you derived these trajectory frequencies. I suggest refining Section 2.4.2.

While I am not an expert in writing, I feel that this manuscript may not be easily readable. Considering that it's a good study with nice ideas on combining different perspectives, I wish the writing also matched that high standard.

Corrections:

Line 49: “…vastness of the boreal region; it cannot be covered with advanced ground-based…” (added a ';', removed the second 'based')Line 79: works -> studies