南京北郊夏季云凝结核活化特性研究

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Abstract The activation characteristics of cloud condensation nuclei (CCN) of atmospheric aerosols were observed over the northern suburbs of Nanjing from July to August 2018 using the SMPS-CCNC coupling method. The results showed that an average value of the aerosol hygroscopicity parameter (κ) in summer was 0.31 there; the CCN number concentrations (N_CCN) at different supersaturations (S) were (1.43±0.60)x10³cm^-3 (S=0.13%), (2.64±1.06)x10³cm^-3 (S=0.23%), (3.88±1.35)x10³cm^-3 (S=0.41%), (4.81±1.64)x10³cm^-3 (S=0.59%), and (5.58±1.88)x10³cm^-3 (S=0.77%), respectively. The peak values were found between 18 and 23 LT. The N_CCN of the double high pollution day (high PM_2.5 concentration and high O₃ concentration) was higher than that of the control day (low PM_2.5 concentration and low O₃ concentration) under different S; and the κ value (0.33) was also much higher than that of the control day (0.22). These could be mainly attributed to the chemical composition of PM_2.5 and the higher O₃ concentration in summer. The higher O₃ concentration in summer would accelerate the photochemical or ozone oxidation reaction and therefore promote the formation and aging of secondary aerosols.

Key words： cloud condensation nodules activation properties hygroscopicity parameters

Received: 08 October 2022

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X513

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	ZHOU Li
	MA Yan
	ZHENG Jun
	ZOU Hua

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ZHOU Li,MA Yan,ZHENG Jun等. Activation characteristics of cloud condensation nuclei in summer over the northern suburbs of Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2210-2219.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2210

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