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• W5632004 abstract "The scavenging of particles by precipitation is one of the major processes by which the atmosphere is cleansed and the balance between the sources and sinks of atmospheric aerosol particles is maintained. While significant experimental and theoretical work has been dedicated to estimate the particle lost due to the washout mechanism under a variety of conditions (Wang and Pruppacher, 1977; Slinn, 1983), recent reports show that the representation of aerosol removal processes in current aerosol transport models remains a source of uncertainty (Rasch et al., 2000). Particles may be scavenged by precipitation due to inertial impaction Brownian motion, electrical and phoretic effects. Theoretical and numerical studies of the washout mechanisms have led to the predictions of a functional dependence of the scavenging collision efficiency on the aerosol size. Although there are some numerical microphysical models that prescribed meteorological parameters coupled with the cloud microphysics and aerosol removal processes, these models are too complex, and require huge computational resources to be used in comprehensive three dimensional models.. Thus, various scavenging coefficients, expressed as constants or functions of the precipitation intensity, are used in regional or mesoscale Lagrangian and Eulerian models to describe the precipitation and wet removal of pollutants (Seinfeld and Pandis 1998). However, the dependence of the scavenging process on the aerosol particle and drop size distribution and also the drop settling velocity can not be considered. Thus, for practical purposes, the development of a more simple and accurate model, which describes the particle removal process by wet precipitation, coupled with an air quality model, is needed. The main purpose of our study is the development of a moment model for the simulation of particle scavenging by raindrops under consideration of the physical scavenging mechanisms Brownian diffusion, interception, impaction, thermophoresis, diffusiophoresis and electrical attraction. The evolution of the particle size distribution by a wet scavenging process for the entire ambient aerosol size range is investigated using the moment method, which is easy to handle and computationally efficient, compared with other numerical methods, such as sectional size representation. A log-normal aerosol distribution was assumed, and the collision efficiency formula given by Davenport and Peters (1978) was modified for use in the moment method. The parameterisation scheme was used to simulate the particle lost due to the washout mechanism in the regional air quality model COSMO-ART (Vogel et Al., 2009). The parameterisation scheme and the results of our simulations will be presented." @default.
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• W5632004 date "2009-01-01" @default.
• W5632004 modified "2023-09-24" @default.
• W5632004 title "Parameterisation of the aerosol washout process using a moment model" @default.
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