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Bogdan et al. (1) discuss the relevance of surface roughness of vapor-deposited so-called “ice Ic” discovered in ref. 2 for ice crystals formed at low temperatures in cirrus clouds. The authors emphasize that for ice nucleation from solute aerosol droplets, the initial ice crystal is coated by residual freeze-concentrated solutions, and they provide images from laboratory freezing experiments on large H2SO4 and NH4-sulfate solution droplets. Although cirrus clouds are likely to contain ice formed via freezing of concentrated solutions as discussed in refs. 20, 55, 58, and 59 from ref. 2, at least initially leading to micrometer-sized nearly spherical …

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