Particle number size distributions and formation and growth rates of different new particle formation types of a megacity in China  

作　　者：Liang Dai Yu Zhao Lei Zhang Dong Chen Rongrong Wu 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse and School of the Environment,Nanjing University,Jiangsu 210023,China [2]Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET),Nanjing University of Information Science and Technology,Jiangsu 210044,China

出　　处：《Journal of Environmental Sciences》2023年第9期11-25,共15页环境科学学报（英文版）

基　　金：sponsored by the National Natural Science Foundation of China(Nos.41922052 and 42177080)。

摘　　要：To understand the contribution of new particle formation(NPF)events to ambient fine particle pollution,measurements of particle size distributions,trace gases and meteorological conditions,were conducted at a suburban site(NJU)from October to December 2016 and at an industrial site(NUIST)from September to November 2015 in Nanjing.According to the temporal evolution of the particle size distributions,three types NPF events were observed:typical NPF(Type A),moderate NPF events(Type B)and strong NPF(Type C)events.The favorable conditions for Type A events included low relative humidity,low concentration of pre-existing particles,and high solar radiation.The favorable conditions of Type B events were similar to Type A,except for a higher concentration of pre-existing particles.Type C events were more likely to happen with the higher relative humidity,lower solar radiation and continuous growth of pre-existing particle concentration.The formation rate of 3 nm(J3)was the lowest for Type A events and highest for Type C events.In contrast,the growth rates of 10 nm and 40 nm particles were the highest for Type A,and lowest for Type C.Results show that NPF events with only higher J3 would lead to the accumulation of nucleation mode particles.Sulfuric acid was important for the formation of particles but had little effect on the growth of particle size.

关 键 词：New particle formation Size distribution Formation and growth rate Aerosol pollution 

分 类 号：X513[环境科学与工程—环境工程]