Modelling mixed-phase clouds with the large-eddy model UCLALES–SALSA

Ahola, Jaakko; Korhonen, Hannele; Tonttila, Juha; Romakkaniemi, Sami; Kokkola, Harri; Raatikainen, Tomi

The large-eddy model UCLALES–SALSA, with an exceptionally detailed aerosol description for both aerosol number and chemical composition, has been extended for ice and mixed-phase clouds. Comparison to a previous mixed-phase cloud model intercomparison study confirmed the accuracy of newly implemented ice microphysics. A further simulation with a heterogeneous ice nucleation scheme, in which ice-nucleating particles (INPs) are also a prognostic variable, captured the typical layered structure of Arctic mid-altitude mixed-phase cloud: a liquid layer near cloud top and ice within and below the liquid layer. In addition, the simulation showed a realistic freezing rate of droplets within the vertical cloud structure. The represented detailed sectional ice microphysics with prognostic aerosols is crucially important in reproducing mixed-phase clouds.

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Ahola, Jaakko / Korhonen, Hannele / Tonttila, Juha / et al: Modelling mixed-phase clouds with the large-eddy model UCLALES–SALSA. 2020. Copernicus Publications.

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