AAAR 33rd Annual Conference
October 20 - October 24, 2014
Rosen Shingle Creek
Orlando, Florida, USA
Abstract View
Effect of Raindrop Size Distribution on Scavenging of Aerosol Particles from Gaussian Air Pollution Plumes Emitted from Point and Line Sources
BORIS KRASOVITOV, Tov Elperin, Andrew Fominykh, Ben-Gurion University of the Negev
Abstract Number: 37 Working Group: Aerosols, Clouds, and Climate
Abstract We suggest analytical model of scavenging of aerosol particles by rain in Gaussian air pollution plumes emitted from point and line industrial sources. The effect of raindrops size distribution was taken into account by using Monte Carlo simulations whereby we assumed the log-normal size distribution of raindrops with Feingold and Levin parameterization based on the long-time measurements of rain drops size spectra in Israel. The developed model allows analyzing spatial and temporal evolution of aerosol concentration in the gaseous phase and inside raindrops. We derived explicit analytical expression which allows analyzing the dependence of the rate of the aerosols scavenging from air pollution plumes emitted from point and line sources on different parameters, e.g. rain intensity, pollutant emission rate, droplet size distribution. Aerosol concentration distributions were calculated for different scenarios of atmospheric stability. It is found that maximum ground level concentration of aerosols depends on rainfall intensity, and the location of the maximum approaches the emission source when rainfall intensity increases. The obtained results can be useful in the analysis of different meteorology-chemistry models including scavenging of aerosols in air pollution plumes by rain and for the assessment of human exposure to various chemical, biological and radiological contaminants.