Dear authors,

please address the minor comments from one reviewer.

Best regards,

Xiaohong Liu

Dear Authors,

Thanks for making efforts to address the reviewers' comments.

Secondary ice production (SIP) is a revived topic in cloud microphysics, although there are still not many studies in the literature. Future studies based on observations and modeling on this topic are certainly needed.

There is a very recent study: Zhao et al. ACP (2021) "Impacts of secondary ice production on Arctic mixed-phase clouds based on ARM observations and
CAM6 single-column model simulations", which found that ice-ice collision is not an efficient process compared to other ice formation in the single-layer stratus with cloud-top temperatures between -10 and -15C. They also studied the relative importance of other SIP mechanisms in relation to primary ice nucleation. This work is highly relevant to your study and needs to be introduced in your paper.

There are a few corrections needed in the manuscript:
1. Line 61: "indentified" to "identified"
2. Line 66: "18% these cases" to "18% of these cases"
3. Line 538: the formula for C multiplication efficiency needs to be rewritten


Best regards,

Xiaohong Liu