a 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models文档.pdf

a 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models文档.pdf

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a 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models文档

ARTICLE IN PRESS Atmospheric Environment 41 (2007) 6808–6822 /locate/atmosenv A 3-mode parameterization of below-cloud scavenging of aerosols for use in atmospheric dispersion models Jian Feng Canadian Meteorological Centre, Meteorological Service of Canada, 2121 Trans-Canada Highway, Dorval, Que., Canada H9P 1J3 Received 20 December 2006; received in revised form 12 April 2007; accepted 20 April 2007 Abstract Atmospheric aerosols are subject to below-cloud scavenging by precipitation. The scavenging coefficient depends on the aerosol size significantly. The traditional bulk parameterization represents the mean wet scavenging coefficient for the whole aerosol size range. This parameterization significantly overestimates the scavenging of aerosol mass by a heavy rain or a long-duration medium rain. In this study, we present a 3-mode parameterization of the mean scavenging coefficient for each aerosol mode instead of representation for the whole aerosol size range. The new parameterization takes into account the aerosol number size distribution, the rain droplet size distribution and the spectral collision efficiency between the aerosol particle and the rain droplet. Comparing the calculation of mass depletion due to below-cloud scavenging, the 3-mode parameterization agrees well with the size-resolved explicit method. The new parameterization can be easily implemented in atmospheric dispersion models. r 2007 Elsevier Ltd. All rights reserved. Keywords: Aerosol; Wet scavenging; Atmospheric dispersion model 1. Introduction Most often, in-cloud scavenging is the main removal

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