Abstract
A parameterization for heterogeneous ice nucleation of dust particles in the deposition mode is proposed and implemented in a Large Eddy Simulation model. The approach based on Classical Nucleation Theory relies on the definition of contact angle PDFs based on experimental data to characterize nucleation ability of the aerosol population. A bin approach is used to discretize the contact angle PDFs in order to account for the fact that the most efficient ice nuclei will form ice crystals quickly leaving only the least efficient nuclei as simulation progresses. The nucleation scheme is evaluated against a single-layer mixed-phase cloud observed over Barrow during the ISDAC campaign. As a matter of fact, analysis of the data collected onboard the aircraft during flight 31 suggests that dust particles are most likely the dominant source of newly nucleated ice crystals, acting in the deposition mode.
Published Version
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