Seasonal variations of aerosol number concentration and spectrum distribution in Nanjing Online publication date: Tue, 14-Dec-2021
by Qi Jiang; Fei Wang; Chun Ying; Bin Zhu
International Journal of Environment and Pollution (IJEP), Vol. 68, No. 1/2, 2020
Abstract: In this paper, the diurnal variations and seasonal variations of the aerosol spectrum distribution, as well as their correlations with meteorological factors in Nanjing in different seasons, are analysed. The results show that the number concentration of ultrafine particle in size of 0.01-0.1 μm accounts for over 60% of the total particle concentration in each season. The Aitken mode (AIM) particles dominate the changes of aerosol in Nanjing, which are mainly from traffic sources. Both local emissions and external transportation make important contributions to the air pollution in Nanjing. The southerly and easterly airflows are conducive to the accumulation of pollutants. The number concentrations of the AIM and Accumulation mode (ACM) particles decrease with the increasing wind speed, while the variation trend of the Nucleation mode (NUM) particles is opposite. The removal efficiency of precipitation for the ACM particles is much lower than that on the other three modes.
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