| Title: | "[New Particle Formation Events in Summer and Winter in the Coastal Atmosphere in Qingdao, China]" |
| Author(s): | Sun Y; Zhu YJ; Meng H; Liu B; Liu YH; Dong C; Yao XH; Wang WX; Xue LK; |
| Address: | "Environment Research Institute, Shandong University, Qingdao 266237, China. Qingdao Eco-environment Monitoring Center of Shandong Province, Qingdao 266003, China. Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China" |
| DOI: | 10.13227/j.hjkx.202007230 |
| ISSN/ISBN: | 0250-3301 (Print) 0250-3301 (Linking) |
| Abstract: | "Atmospheric particle number size distributions were measured by a wide-range particle size spectrometer and a scanning mobility particle size spectrometer in the summertime and wintertime in the coastal area of Qingdao (China). The inorganic and organic gaseous precursors and particulate chemical composition were measured to characterize new particle formation (NPF) events by combining meteorological parameters and backward trajectories. In summer, the occurrence frequency of NPF events was 18% lower. However, the atmospheric particle number concentration increased by approximately 1-4 times during the NPF events compared with those without NPF. The apparent formation rates and growth rates were (5.2+/-4.3) cm(-3).s(-1) and (6.5+/-2.2) nm.h(-1), respectively, except for a special NPF event on July 20. The correlation analysis results implied that biogenic volatile organic compounds (BVOCs) seemingly favor NPF, and the reverse is true for anthropogenic volatile organic compounds (AVOCs). The occurrence frequency of NPF events of 27% in winter was clearly higher than that in summer. The apparent formation rates and growth rates, i.e., (3.3+/-3.1) cm(-3).s(-1) and (5.3+/-3.3) nm.h(-1), decreased, although the decreases were not significant (P>0.05). The correlation analyses implied that AVOCs favored NPF. However, BVOCs had no correlation with NPF. For the cases in which new particles could grow to CCN sizes (>50 nm), the particle growth characteristics showed significant seasonal differences, i.e., in summer, new particles could grow to CCN sizes via photochemical reactions, whereas in winter, second-stage growth driven by the formation of nitrate aerosols was needed to grow new particles to CCN sizes" |
| Keywords: | atmospheric particle number concentration chemical composition coastal area gaseous precursors new particle formation(NPF); |
| Notes: | "PubMed-not-MEDLINESun, Yue Zhu, Yu-Jiao Meng, He Liu, Bing Liu, Yu-Hong Dong, Can Yao, Xiao-Hong Wang, Wen-Xing Xue, Li-Kun chi English Abstract China 2021/04/23 Huan Jing Ke Xue. 2021 May 8; 42(5):2133-2142. doi: 10.13227/j.hjkx.202007230" |
