Activation characteristics of cloud condensation nuclei in summer over the northern suburbs of Nanjing
ZHOU Li, MA Yan, ZHENG Jun, ZOU Hua
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
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 (NCCN) 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 NCCN of the double high pollution day (high PM2.5 concentration and high O3 concentration) was higher than that of the control day (low PM2.5 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 PM2.5 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.
周莉, 马嫣, 郑军, 邹华. 南京北郊夏季云凝结核活化特性研究[J]. 中国环境科学, 2023, 43(5): 2210-2219.
ZHOU Li, MA Yan, ZHENG Jun, ZOU Hua. Activation characteristics of cloud condensation nuclei in summer over the northern suburbs of Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2210-2219.
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