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Aerosol size distribution and new particle formation events in the suburb of Xi'an, northwest China
Peng, Yan1,2,3; Liu, Xiaodong1,2,4; Dai, Jin3; Wang, Zhao5; Dong, Zipeng3; Dong, Yan3; Chen, Chuang3; Li, Xingmin3; Zhao, Na6; Fan, Chao6
AbstractParticle number concentration and size distribution are important for better understanding the characteristics of aerosols. However, their measurements are scarce in western China. Based on the first measurement of particle number size distribution (10-487 nm) in the suburb of Xi'an, northwest China from November 2013 to December 2014, the seasonal, monthly and diurnal average particle number concentrations were investigated, and the characteristics of new particle formation (NPF) events and their dependencies on meteorological parameters also discussed. The results showed that the annual average particle number concentrations in the nucleation (N-Nuc), Aitken (N-AIT), and Accumulation (N-Acc) size ranges were 960 cm 3, 4457 cm 3, 3548 cm 3, respectively. The mean total particle number concentration (N-TOT) was 8965 cm(-3) and largely dominated by particles in Aitken mode. The number concentration was dominated by particles around 67.3 nm in spring, summer and fall, while about 89.8 nm in winter. The percentage of the ultrafine size range (UFP, particles of diameter below 100 nm) to total particle number concentration was 63.2%, 69.6%, 62.2% and 58.1% in four seasons. The diurnal variation of the nucleation mode particles was mainly influenced by NPF events in summer, while by both traffic densities and NPF events in spring, fall and winter. The diurnal variation of the number concentration of Aitken mode particles correlated with the traffic emission in spring, fall and winter, while in summer it more correlated with contribution of the growth of the nucleation mode particles. The burst of nucleation mode particles typically started in the daytime (08:15-16:05, LST). The growth rates of nucleated particles ranged from 2.8 to 10.7 nm ha with an average of 5.0 +/- 1.9 nm h(-1)Among observed 66 NPF events from 347 effective measurement days, 85 percent of their air masses came from north or northwest China, resulting in a low concentration of pre-existing particles, and only 15 percent came southerly from Qingling Mountains. Based on their growth rate, 64 and 36 percent of their subsequent particles, corresponding to types 1 and 2 NPF events, grew and seldom grew after the burst of nucleation mode particles. For type 1 NPF event, the nucleated particles could grow up to 40 nm or larger when surface winds shifted from westerly to easterly or southeasterly (from village areas). For type 2 NPF events, the particles kept almost unchanged when the winds stayed westerly. This implied that the surface wind direction with different emissions might play an important role in new particle growth in suburb of Xi'an. (C) 2017 Elsevier Ltd. All rights reserved.
KeywordAtmospheric Aerosol Size Distribution New Particle Formation Meteorological Parameters
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS SubjectEnvironmental Sciences ; Meteorology & Atmospheric Sciences
WOS IDWOS:000395354400018
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Meteorol Inst Shaanxi Prov, Xian 710016, Peoples R China
4.Xi An Jiao Tong Univ, Sch Human Settlements & Civil Engn, Xian 710049, Peoples R China
5.Shaanxi Remote Sensing Informat Ctr Agr, Xian 710049, Peoples R China
6.Xian Meteorol Bur, Xian 710100, Peoples R China
Recommended Citation
GB/T 7714
Peng, Yan,Liu, Xiaodong,Dai, Jin,et al. Aerosol size distribution and new particle formation events in the suburb of Xi'an, northwest China[J]. ATMOSPHERIC ENVIRONMENT,2017,153(2017):194-205.
APA Peng, Yan.,Liu, Xiaodong.,Dai, Jin.,Wang, Zhao.,Dong, Zipeng.,...&Fan, Chao.(2017).Aerosol size distribution and new particle formation events in the suburb of Xi'an, northwest China.ATMOSPHERIC ENVIRONMENT,153(2017),194-205.
MLA Peng, Yan,et al."Aerosol size distribution and new particle formation events in the suburb of Xi'an, northwest China".ATMOSPHERIC ENVIRONMENT 153.2017(2017):194-205.
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