Dear Authors,

I am pleased to accept your manuscript as publication in Atmospheric Chemistry and Physics after addressing the two technical corrections given below.

With kindest regards,

Daniel Knopf

Technical corrections:
I agree with the referee that section 3.3, the note on chemical aerosol analyses, is better suited in the Supplement. I suggest to make a note in one of the previous sections that this additional information on aerosol is available in the Supplement. As an example: "For a limited number of particles we performed chemical analyses of aerosol samples collected outside and inside PSCs indicating extraterrestrial and terrestrial contamination as potential sources as given in more detail in the Supplement."

In the Supplement: For Fig. S4 the legends for the case S2 and S3 seem ambiguous. The S3 case is the lowest curve, dash-dotted. However, the legend indicates S2 to be dash-dotted?