Abstract

Aerosol distribution can be represented in many ways in an aerosol model. Most common one is modal representation, its computationally the most feasible but it also has problems representing the distribution realistically during physical processes. We are currently studying how different distribution representations affect the aerosol activation during cloud formation and also how they affect light extinction. We use modal model with freely moving and size restricted modes, and also a more accurate but significantly computationally heavier sectional model. The results from calculations of cloud droplet number concentrations (CDNC) and light extinction coefficients are then compared between the models in various different scenarios. Depending on the situation the differences of the CDNC can be significant and in the case of extinction coefficients moderate.

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