Dear Authors,

I have now read and evaluated the comments which three anonymous referees have provided on the revised versions of part 1 and part 2 of this manuscript, and have also added my own comments on part 1 in the attached document. Your careful consideration of all reviewer comments and the detailed responses are appreciated, but I have to say that I share a major concern on an issue identified by two of the reviewers about the implementation of the competition between heterogeneous and homogeneous ice nucleation in the cirrus regime. This is described in part 1, but is also crucial for the results in part 2. If the background aerosol concentration for homogeneous freezing of deliquesced aerosols is set to an unrealistically low value of 1/L, all effects by adding dust are drastically exaggerated or can have the wrong sign. Furthermore, I still miss details on whether and how deposition ice nucleation (parameterized by Phillips et al 2008) is coupled to the dust concentration.

If you think you can address these points satisfactorily, or if they are based on a misunderstanding, please provide a revised version which clarifies them. Otherwise I have to reject both parts of this manuscript.

Best regards,
Corinna Hoose

Dear Authors,

Thanks for your effort to incorporate the requested major changes. I'm pleased to see that the results look much more reasonable now. My only remaining suggestion concerns Fig. 6: As the points are very dense, I suggest to transform these plots into 2D histograms and use a color bar to show the density of the points.

Best regards,
Corinna Hoose