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Charging states on atmospheric aerosol particles affected by meteorological conditions

Particuology 2020年第5期18卷 1-9页

作者： Yuanping He Zhaolin Gu Weizhen Lu Liyuan Zhang Daizhou Zhang Tomoaki Okuda Chuck Wah Yu Department of Earth and Environmental Sciences Xi'an Jiaotong UniversityXi'an 710049China Department of Architecture and Civil Engineering City University of Hong KongKowloon TongHong KongChina Department of Environmental Engineering Chang'an UniversityXi'an 710064China Faculty of Environmental Symbiotic Sciences Prefectural University of KumamotoKumamoto 862-8502Japan Department of Applied Chemistry Keio University3-14-1 HiyoshiKohoku-kuYokohama 223-8522Japan International Society of the Built Environment(1SBE) Milton Keynes MK78HQUK

Previous studies on haze formation focused mainly on the various chemical components in aerosol particles and their physicochemical effects on particle behaviour(e.g.,generation,growth,and agglomeration).This paper describes the measurement of the charging state on atmospheric aerosol particles,which could be affected by meteorological conditions.A series of experiments on particle charging state and meteorological factors was undertaken on the roof of the west 4th building on the Qujiang Campus at Xi'an Jiaotong University(China).Measurements were conducted approximately 20 m above ground level,Our results showed that most atmospheric particles carried net negative or positive charge and that the electric charge on the particles varied diurnally and *** average amount of charge on particles was higher in winter than in *** number concentration of charged particles was higher during the day than *** difference in the average charge of aerosol particles was found between sand-dust days and haze days.A strong relationship was found between the PM2.s concentration,charge amount on particles,and *** findings show that particle formation and growth could partly be attributed to variation in particle charging state,which is related to meteorological conditions including atmospheric humidity.

关键词： Aerosol particles Atmospheric humidity Charging state Haze day Physicochemical effect sand-dust day

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