P ARTICLE -T URBULENCE I NTERACTIONS IN A TMOSPHERIC C LOUDS

▪ Abstract Turbulence is ubiquitous in atmospheric clouds, which have enormous turbulence Reynolds numbers owing to the large range of spatial scales present. Indeed, the ratio of energy-containing and dissipative length scales is on the order of 10 5 for a typical convective cloud, with a corresponding large-eddy Reynolds number on the order of 10 6 to 10 7 . A characteristic trait of high-Reynolds-number turbulence is strong intermittency in energy dissipation, Lagrangian acceleration, and scalar gradients at small scales. Microscale properties of clouds are determined to a great extent by thermodynamic and fluid-mechanical interactions between droplets and the surrounding air, all of which take place at…