A shallow cloud with warm microphysics is used to study the contribution of the gradient of mean liquid water quantities and microphysical processes to the evolution of liquid water variabilities. The simulations show that the cloud water variance is mainly produced by the cloud water gradient term and constantly destroyed by the effects of self-conversion and accretion processes. Conversely, these processes of rain droplet formation and growth contribute as the main source for the variance of precipitating water and the cloud water-precipitating water covariance. Microphysical processes of liquid water quantity depletion including evaporation of cloud droplets and sedimentation of precipitable droplets act as sinks for the variances and covariances of liquid water quantities. Finally, for rainfall water variabilities, the gradient term is admittedly less important but is a real support to the source or sink terms of the microphysics.

liquid water content, turbulence, variance, covariance, microphysical processes.

Received: April 19, 2022; Accepted: May 20, 2022; Published: May 28, 2022

How to cite this article: Bakary Coulibaly, Emile Danho and N’dri Roger Djue, Budgets of variances and covariances of liquid water content in warm and precipitating cloud layers, Advances and Applications in Fluid Mechanics 28 (2022), 11-26. http://dx.doi.org/10.17654/0973468622002

This Open Access Article is Licensed under Creative Commons Attribution 4.0 International License

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