Modelling mixed-phase clouds with the large-eddy model UCLALES-SALSA
: Ahola J, Korhonen H, Tonttila J, Romakkaniemi S, Kokkola H, Raatikainen T
Publisher: COPERNICUS GESELLSCHAFT MBH
: 2020
: Atmospheric Chemistry and Physics
: ATMOSPHERIC CHEMISTRY AND PHYSICS
: ATMOS CHEM PHYS
: 20
: 19
: 11639
: 11654
: 16
: 1680-7316
: 1680-7324
DOI: https://doi.org/10.5194/acp-20-11639-2020
: https://research.utu.fi/converis/portal/Publication/51396239
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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