title: [Atmospheric nucleation rate at Xinken site in the Pearl River Delta of China].
abstract: The atmospheric nucleation rates are calculated, the nucleation mechanism and factors affecting the calculation are investigated at Xinken Site in the Pearl River Delta of China. Based on particle size distribution data from Xinken site during PRIDE-PRD2004, the apparent formation rates of 3 nm particles are obtained. Nucleation rates for critical nuclei of 1 nm size are analyzed from particle flux equation of different size in the diameter axis. The results show the 3 nm apparent formation rates during the new particle formation events are 7.2-9.4 cm(-3) x s(-1), the atmospheric nucleation rate for 1 nm critical nuclei are 7.65 x 10(2)-1.14 x 10(5) cm(-3). The derived nucleation rates are consistent with the concentrations of precursor vapor sulphuric acid, which are supposed to participate nucleation in most cases. With higher contribution of accumulation mode background aerosol to coagulation sink, the variation in particle number during event period imposes neglectable influence on the calculated nucleation rates. Information on nucleation rates provide further insight into the nucleation mechanism. Since variation in critical nuclei size may lead large uncertainty to nucleation rates, identification of the exact critical nuclei size is important for nucleation rate study.
authors: Research Institute of Chemical Defence, Beijing 102205, China. yggong@pku.edu.cn
authors: You-Guo
authors: YG
authors: Gong
authors: Min
authors: M
authors: Hu
authors: Wei-Wei
authors: WW
authors: Song
authors: Jian
authors: J
authors: Gao
authors: Feng
authors: F
authors: Liu
authors: Yuan-Hang
authors: YH
authors: Zhang
mesh_terms: D000336:Aerosols / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000032:analysis; D002681:China; D004784:Environmental Monitoring; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D045483:Rivers
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter