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

Author:

Ahola JaakkoORCID,Korhonen HanneleORCID,Tonttila Juha,Romakkaniemi SamiORCID,Kokkola HarriORCID,Raatikainen TomiORCID

Abstract

Abstract. 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.

Funder

European Research Council

Luonnontieteiden ja Tekniikan Tutkimuksen Toimikunta

Publisher

Copernicus GmbH

Subject

Atmospheric Science

Reference61 articles.

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2. Ahola, J., Korhonen, H., Tonttila, J., Romakkaniemi, S., Kokkola, H., and Raatikainen, T.: UCLALES-SALSA Ice microphysics V1.0, GitHub, under release tag IceV1.0, available at: http://github.com/UCLALES-SALSA/UCLALES-SALSA, last access: 12 September 2019. a

3. Ahola, J., Korhonen, H., Tonttila, J., Romakkaniemi, S., Kokkola, H., and Raatikainen, T.: Data for research article “Modelling mixed-phase clouds with large-eddy model UCLALES-SALSA”, GitHub, available at: http://urn.fi/urn:nbn:fi:att:5144df1e-4cdf-4d5a-af46-a545ebaa4460, last access: 6 July 2020. a

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