Comment on Review of Experimental Studies of Secondary IceProduction by Korolev and Leisner (2020)

Abstract. This is a comment on the article Review of Experimental Studies of Secondary Ice Production by Korolev and Leisner (2020, hereafter termed KL2020 ), referring to the discussion about ice fragmentation. We argue that the only two studies characterising fragmentation in ice-ice collisions are not so erroneous as to prevent their use in representing this breakup in numerical models, contrary to the impression given in the review. A scaling analysis suggests that breakup of ice during sublimation can make a significant, albeit lesser, contribution to ice enhancement in clouds.