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Kuang, Ye; Zhao, ChunSheng; Tao, JiangChuan; Bian, YuXuan; Ma, Nan; Zhao, Gang (2017)
Languages: English
Types: Article
Subjects:
Aerosol hygroscopicity is crucial for understanding roles of aerosol particles in atmospheric chemistry and aerosol climate effects. Light scattering enhancement factor f(RH,λ) is one of the parameters describing aerosol hygroscopicity which is defined as f(RH,λ) = (σsp (RH,λ))/(σsp(dry,λ)) where σsp (RH, λ) or σsp (dry, λ) represents σsp at wavelength λ under certain RH or dry conditions. Traditionally, an overall hygroscopicity parameter κ can be retrieved from measured f(RH, λ), hereinafter referred to as κf(RH), by combining concurrently measured particle number size distribution (PNSD) and mass concentration of black carbon. In this paper, a new method is proposed to directly derive κf(RH) based only on measurements from a three-wavelength humidified nephelometer system. The advantage of this newly proposed novel approach is that it allows researchers to estimate κf(RH) without any additional information about PNSD and black carbon. Values of κf(RH) estimated from this new method agree very well with those retrieved by using the traditional method, the average difference between κf(RH) derived from newly proposed method and traditional method is 0.005 and the square of correlation coefficient between them is 0.99.
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