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Moist Rayleigh–Bénard convection with water saturated boundaries is explored using a One-Dimensional Turbulence model. The system involves both temperature $T$ and water vapour pressure $e_{v}$ as driving scalars. The emphasis of the work is on a supersaturation $s$ , a nonlinear combination of $T$ and $e_{v}$ that is crucial to cloud formation. Its mean as well as fluctuation statistics determine cloud droplet growth and therefore precipitation formation and cloud optical properties. To explore the role of relative scalar diffusivities for temperature ( $D_{t}$ ) and water vapour ( $D_{v}$ ), three different regimes are considered: $D_{v}>D_{t}$ , $D_{v}\approx D_{t}$ and $D_{v} more » « less

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