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. In recent papers (Alfonso et al., 2013; Alfonso and Raga, 2017) the sol–geltransition was proposed as a mechanism for the formation of large dropletsrequired to trigger warm rain development in cumulus clouds. In the contextof cloud physics, gelation can be interpreted as the formation of the“lucky droplet” that grows by accretion of smaller droplets at a muchfaster rate than the rest of the population and becomes the embryo forraindrops. However, all the results in this area have been theoretical orsimulation studies. The aim of this paper is to find some observationalevidence of gel formation in clouds by analyzing the distribution of thelargest droplet at an early stage of cloud formation and to show that themass of the gel (largest drop) is a mixture of a Gaussian distribution and a Gumbeldistribution, in accordance with the pseudo-critical clustering scenariodescribed in Gruyer et al. (2013) for nuclear multi-fragmentation.

atmospheric chemistry and physics

The impact of fluctuations and correlations in droplet growth by collision–coalescence revisited – Part 2: Observational evidence of gel formation in warm clouds