南京冬季云凝结核活化特征及闭合研究

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Abstract The cloud condensation nuclei (CCN) activation properties of aerosols were measured from December 2017 to January 2018 in Nanjing, and four kinds of closure methods were used to predict the concentration of CCN. The results showed that the aerosols in Nanjing exhibited relatively high CCN activity during the observation period, with an average hygroscopicity parameter (κ) of 0.36. From a comparation of the CCN activation characteristics under clean and varying degrees of fog and haze conditions, it was found that the aerosol hygroscopicity gradually decreased as the pollution deteriorated. Within the same visibility (VIS) range, aerosol particles had higher hygroscopicity and activation capacity under higher relative humidity (RH). This may be because that high RH condition can promote heterogeneous and liquid phase reactions of gaseous species in the atmosphere to generate more secondary inorganic aerosols. The results of the four closure methods showed that the prediction of CCN number concentration by using critical diameters, cut-off diameters and size-resolved activation ratios generated better results in general. Among them, the method of cut-off diameters generated best results in predictions at low supersaturation (S).

Key words： aerosol activation properties size-resolved CCN closure study

Received: 15 December 2019

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X513

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	Articles by authors
	ZOU Hua
	MA Yan
	ZHENG Jun
	LI Yu-rong
	GAO Rui-jie

Cite this article:

ZOU Hua,MA Yan,ZHENG Jun等. Characterization and prediction of cloud condensation nuclei activity in winter of Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 2811-2820.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/2811

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