Title: Observational study on the size distribution characteristics of atmospheric aerosol mass concentration in autumn of Beijing City
Abstract: In order to study the impact of different synoptic patterns and meteorological parameters on size distributions of atmospheric aerosol mass concentration,continuous measurements of particles ranging from 0.5 to 20 μm by an Aerodynamic Particle Sizer were conducted in Beijing from October to November,2010.It was found that the aerosol size distributions varied greatly under different weather conditions.In clean weather conditions with low mass concentration influenced by the northwestern airflow,aerosols mainly accumulated in the coarse range.In moderately turbid weather,the mass concentration was moderately high and peak values were comparable in the coarse and fine ranges.In severely turbid weather impacted by the southwestern airflow,the fine particles dominated in the size distributions.With impacts by the same air mass,the mass size distribution showed similar shapes in day and night.In clean weather,the unimodal distribution was retained,while bimodal distributions were observed in both moderately and severely turbid weather.The values of fine range in the daytime were a little larger than those measured at night because of the photochemical reaction.The increasing distribution values were influenced by the variation of relative humidity and temperature for the moderate turbid weather.Under severely turbid weather conditions,with little differences in relative humidity and temperature,there was no significant change in size distribution between day and night.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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