Dear Dr. Barrett

Thank you for your revised submission. Per ACP policy, please restructure the response to reviewers file so that it conforms to: "Before submitting a revised version of their manuscript for publication in ACP, the authors should have answered the referee comments and relevant short comments cumulatively or individually in one or more author comments. The author comments should be structured in a clear and easy-to-follow sequence: (1) comments from referees/public, (2) author's response, and (3) author's changes in manuscript. " It is part (3) that is currently missing. This will help accelerate the review process.

Thank you

Tim Garrett

Dear Dr. Barrett,

I am pleased to accept you article for publication in Atmospheric Chemistry and Physics. The reviewers provided constructive comments on how to refine the underlying retrieval technique microphysics including uncertainty estimates and these have been carefully addressed. The article presents an interesting advance in using three frequencies of Doppler radar to obtain size distributions inferred from underlying microphysical relations rather than ad hoc assumptions of size distribution mathematical form. The technique is shown to be useful for tracking aggregation in snowfall.

A caution I might make is that the assumed power-law relationships between particle fallspeed and size tend to be based on rather limited data sets, perhaps just a few 10s of measured particles in the case of Locatelli and Hobbs. Further, atmospheric turbulence has a yet to be understood influence on aggregate motions and settling speed.

Regards,

Tim Garrett