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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1066
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
06 Feb 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
A novel method to derive the aerosol hygroscopicity parameter based only on measurements from a humidified nephelometer system
Ye Kuang1, ChunSheng Zhao1, JiangChuan Tao1, YuXuan Bian2, Nan Ma3, and Gang Zhao1 1Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
2State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences
3Leibniz Institute for Tropospheric research, Leipzig, Germany
Abstract. 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.

Citation: Kuang, Y., Zhao, C., Tao, J., Bian, Y., Ma, N., and Zhao, G.: A novel method to derive the aerosol hygroscopicity parameter based only on measurements from a humidified nephelometer system, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1066, in review, 2017.
Ye Kuang et al.
Ye Kuang et al.
Ye Kuang et al.

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Short summary
A novel approach is proposed in this research to derive the aerosol hygroscopicity parameter based only on measurements from a humidified nephelometer system without any additional information about particle number size distribution and black carbon. New findings in this research can bridge the gap between κ-K√∂hler theory and aerosol light scattering enhancement factor and will make the humidified nephelometer system more convenient when it comes to aerosol hygroscopicity research.
A novel approach is proposed in this research to derive the aerosol hygroscopicity parameter...
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