不同污染条件下南京春季CCN活化特征分析

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Abstract Filed observation of cloud condensation nuclei (CCN) activation properties of aerosols were carried out from March 2018 to April 2018 in the northern suburbs of Nanjing. Meteorological data, PM_2.5 number concentration, chemical composition and optical properties of particles are also collected for analysis. The CCN activities of aerosols in polluted days and clean days during the observation period were compared, and the characteristics of typical pollution processes and new particle formation days were analyzed. Results showed that the CCN activity of aerosols are generally high during this observation, with an average hygroscopicity parameter (κ) of 0.30under each supersaturation(SS) condition. The lowest κ was observed under the lowest supersaturation (SS=0.17%), and the maximum activation ratio (B) was 0.72, indicating that aerosols contains many substances that are difficult for activation. κ was seen higher in polluted days than in clean days. When compared to that in clean days, the activation ratio in polluted days was relatively lower and the level of external mixing was higher, which was mainly due to the large amount of less hygroscopic particles emitted by traffic and industry. Aging process of particulate matters are observed fast at night, making particles more hygroscopic and leading to higher CCN number concentration. In new particle formation days, κ showed diurnal variation due to particle nucleation, and new particle formation process also made significant contribution to total aerosol number concentration(N_CN) and CCN number concentration(N_CCN).

Key words： aerosol CCN activation characteristics hygroscopicity

Received: 01 February 2021

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X513

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	Articles by authors
	LU Wen-tao
	MA Yan
	ZHENG Jun
	JIANG You-ling

Cite this article:

LU Wen-tao,MA Yan,ZHENG Jun等. Investigation of cloud condensation nuclei activity under different pollution conditions in spring of Nanjing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 4096-4106.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/4096

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