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https://doi.org/10.5194/acp-2019-633
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-633
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 30 Sep 2019

Submitted as: research article | 30 Sep 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Distinct diurnal variation of organic aerosol hygroscopicity and its relationship with oxygenated organic aerosol

Ye Kuang1,*, Yao He2,*, Wanyun Xu5, Yele Sun2, Pusheng Zhao6, Yafang Cheng4, Gang Zhao3, Jiangchuan Tao1, Nan Ma1, Hang Su4, Yanyan Zhang1, Jiayin Sun7, Peng Cheng7, Wenda Yang7, Shaobin Zhang1, Cheng Wu7, and Chunsheng Zhao3 Ye Kuang et al.
  • 1Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
  • 2State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 3Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
  • 4Max Planck Institute for Chemistry, Mainz 55128, Germany
  • 5State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing, 100081, China
  • 6Institute of Urban Meteorology, China Meteorological Administration, Beijing,100089, China
  • 7Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 15510632, China
  • *These authors contributed equally to this paper.

Abstract. The hygroscopicity of organic aerosols (OA) is important for investigation of its climatic and environmental impacts. However, the hygroscopicity parameter κOrg remains poorly characterized, especially in the relatively polluted environment on the North China Plain (NCP). Here we conducted simultaneous wintertime measurements of bulk aerosol chemical compositions of PM2.5 and PM1 and bulk aerosol hygroscopicity of PM10 and PM1 on the NCP using a capture vaporizer time-of-flight aerosol chemical speciation monitor (ToF-ACSM) and a humidified nephelometer system which measures aerosol light scattering enhancement factor f(RH). A method for calculating κOrg based on f(RH) and bulk aerosol chemical composition measurements was developed. We found that κOrg varied in a wide range with significant diurnal variations. The derived κOrg ranged from almost 0.0 to 0.25 with an average (± 1σ) of 0.08 (± 0.06) for the entire study. The derived κOrg was highly correlated with f44 (fraction of m/z 44 in OA), an indicator of oxidation degree of OA (R = 0.79), and the relationship can be parameterized as κOrg = 1.04 × f44 − 0.02. On average, κOrg reached the minimum (0.02) in the morning near 07:30 and then increased rapidly reaching the peak value of 0.16 near 14:30. The diurnal variations of κOrg were highly and positively correlated with those of mass fractions of oxygenated OA (R = 0.95), indicating that photochemical processing played a dominant role for the increase of κOrg in winter on NCP. Results in this study demonstrate the potential wide applications of humidified nephelometer system together with aerosol composition measurements for investigating the hygroscopicity of OA in various environments, and highlight that the parameterization of κOrg as a function of OA aging processes needs to be considered in chemical transport models for better evaluating the impacts of OA on cloud formation, atmospheric chemistry and radiative forcing.

Ye Kuang et al.
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Short summary
A new method was developed to calculate hygroscopicity parameter κ of organic aerosols (κOrg) based on aerosol light scattering measurements and bulk aerosol chemical composition measurements. Derived κOrg varied in a wide range (near 0 to 0.25) and the organic aerosol oxidation degree impacts significantly on variations in κOrg. Distinc diurnal variation of kOrg is found and its relationship with oxygenated organic aerosol is discussed.
A new method was developed to calculate hygroscopicity parameter κ of organic aerosols (κOrg)...
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