Abstract：This work utilized SMPS and CCNC system to measure size-resolved activation properties of atmospheric particles with diameters of 40~200nm at the CAWNET station in Panyu, Guangzhou, December 2011. The activation curve and statistical results show that the critical dry diameters Dmid are 143.7, 99.5, 74.7and 62.6nm, respectively, at supersaturation of 0.109%、0.20%、0.39%、0.67%, and the cut-off diameters Dcut are 171.9, 119.1, 90.2and 72.5nm, respectively. This indicates that the activation ability of an aerosol particle is mostly controlled by its size, while composition and mixing state of the particle have an effect around the activation critical point. It is also found that the activation ability of aerosols observed in this study is generally weaker than that observed in North China and suburban regions. Our results also show that the CCN number concentrationscalculated based on the size-resolved activation ratio and aerosol size distribution is well correlated with the observed valuess, with an average overestimation of 16%.Further sensitivity tests show thatparticle concentration NCN, normalized size distribution NSD and activation curve ARSR are the three most important factors to the calculated CCN concentration and their relative importance are NCN> NSD> ARSR.
顾雪松, 银燕, 谭浩波, 李菲, 许汉冰, 万齐林. 珠江三角洲地区气溶胶分档活化特性与闭合实验[J]. 中国环境科学, 2013, 33(9): 1553-1562.
GU Xue-Song, YIN Yan, TAN Hao-Bo, LI Fei, XU Han-Bing, WAN Qi-Lin. Size-resolved activation properties of aerosols over the Pearl River Delta and ansensitivitystudy of the CCN slosure. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(9): 1553-1562.
