Aerosol hygroscopicity parameter derived from the light scattering enhancement factor measurements in the North China Plain The summary of HaChi ( Haze in China) Project View project Comprehensive aerosol measurement system based on light-scattering enhancement factor View project Aerosol hygroscopicity parameter derived from the light scattering enhancement factor measurements in the North China Plain

  • Chen J
  • Zhao C
  • Yan P
  • et al.
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Abstract

The relative humidity (RH) dependence of aerosol light scattering is an essential parameter for accurate estimation of the direct radiative forcing induced by aerosol particles. Because of insufficient information on aerosol hy-groscopicity in climate models, a more detailed parameter-ization of hygroscopic growth factors and resulting optical properties with respect to location, time, sources, aerosol chemistry and meteorology are urgently required. In this paper , a retrieval method to calculate the aerosol hygroscopic-ity parameter, κ, is proposed based on the in situ measured aerosol light scattering enhancement factor, namely f (RH), and particle number size distribution (PNSD) obtained from the HaChi (Haze in China) campaign. Measurements show that f (RH) increases sharply with increasing RH, and that the time variance of f (RH) is much greater at higher RH. A sensitivity analysis reveals that the f (RH) is more sensitive to the aerosol hygroscopicity than PNSD. f (RH) for polluted cases is distinctly higher than that for clean periods at a specific RH. The derived equivalent κ, combined with the PNSD measurements, is applied in the prediction of the cloud condensation nuclei (CCN) number concentration. The predicted CCN number concentration with the derived equivalent κ agrees well with the measured ones, especially at high supersaturations. The proposed calculation algorithm of κ with the f (RH) measurements is demonstrated to be reasonable and can be widely applied.

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Chen, J., Zhao, C., Yan, P., Chen, J., Zhao, C. S., Ma, N., & Yan, P. (2014). Aerosol hygroscopicity parameter derived from the light scattering enhancement factor measurements in the North China Plain The summary of HaChi ( Haze in China) Project View project Comprehensive aerosol measurement system based on light-scattering enhancement factor View project Aerosol hygroscopicity parameter derived from the light scattering enhancement factor measurements in the North China Plain. Article in Atmospheric Chemistry and Physics, 14, 8105–8118. Retrieved from www.atmos-chem-phys.net/14/8105/2014/

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