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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-1100
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
08 Jan 2018
Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).
Characterization of aerosol hygroscopicity, mixing state, and CCN activity at a suburban site in the central North China Plain
Yuying Wang1, Zhanqing Li1, Yingjie Zhang2, Wei Du2,3, Fang Zhang1, Haobo Tan4, Hanbing Xu5, Xiaoai Jin1, Xinxin Fan1, Zipeng Dong1, Qiuyan Wang6, and Yele Sun2,3 1College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
2State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
3College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4Key Laboratory of Regional Numerical Weather Prediction, Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China
5Shared Experimental Education Center, Sun Yat-sen University, Guangzhou 510275, China
6Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, 210044, China
Abstract. Aerosol hygroscopicity, mixing state and CCN activity were investigated as a part of the Atmosphere-Aerosol-Boundary Layer-Cloud (A2BC) Interaction Joint Experiment carried out at Xingtai (XT), a suburban site in the center of the North China Plain (NCP). In general, the probability density function of the hygroscopicity parameter (κ-PDF) for 40–200 nm particles had a unimodal distribution and mean κ-PDF patterns for different sizes were similar, suggesting that the particles were highly aged and internally mixed because of strong photochemical reactions. The κ calculated from the hygroscopic growth factor in the daytime and at nighttime showed that photochemical reactions largely enhanced the aerosol hygroscopicity, and the effect became weaker as the particle size increased. In addition, the aerosol hygroscopicity was much larger at XT than at sites in the northern part of the NCP, illustrating that the hygroscopicity of particles varies due to different emissions and chemical processes in the NCP.

Measurement results also showed that new particle formation events occurred frequently at XT, one of the most polluted city in China. The evolution of the planetary boundary layer played a dominant role in aerosol mass concentration changes while particle formation and growth had a greater influence on the variation in aerosol number concentrations. Particle size was the most important factor influencing the ability of aerosols to activate, especially at higher levels of supersaturation (SS). The cloud condensation nuclei (CCN) number concentration (NCCN) derived from chemical composition was highly correlated with the measured NCCN (R2 ≥ 0.85), but was generally overestimated due to measurement uncertainties. The effect of chemical composition on NCCN was weaker relative to the particle size. NCCN sensitivity tests showed that the impact of chemical composition on NCCN became weaker with increasing SS, suggesting that chemical composition played a less role in NCCN estimations at higher SS levels. A good proxy for the chemical comical composition (κ = 0.31) was found, which can simplify the calculation of NCCN on models.

Citation: Wang, Y., Li, Z., Zhang, Y., Du, W., Zhang, F., Tan, H., Xu, H., Jin, X., Fan, X., Dong, Z., Wang, Q., and Sun, Y.: Characterization of aerosol hygroscopicity, mixing state, and CCN activity at a suburban site in the central North China Plain, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1100, in review, 2018.
Yuying Wang et al.
Yuying Wang et al.
Yuying Wang et al.

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Short summary
Very different aerosol hygroscopicity, mixing state were found at this site with these sites in North NCP. The κ-PDF for 40–200 nm particles showed the particles were highly aged and internally mixed at Xingtai because of high pollution and strong photochemical reactions. A good proxy for the chemical comical composition (κ = 0.31) was found, which can simplify the calculation of NCCN on models. Importantly, our study investigated the influence of industrial emission on the aerosol properties.
Very different aerosol hygroscopicity, mixing state were found at this site with these sites in...
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