Simultaneous measurements of new particle formation at 1 s time   resolution at a street site and a rooftop site

doi:10.5194/acp-17-9469-2017

CORC > 北京大学 > 环境科学与工程学院

	Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
	Zhu, Yujiao ; Yan, Caiqing ; Zhang, Renyi ; Wang, Zifa ; Zheng, Mei ; Gao, Huiwang ; Gao, Yang ; Yao, Xiaohong
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2017
关键词	SECONDARY ORGANIC AEROSOL NUCLEATION MODE PARTICLES DUTY DIESEL-ENGINE SULFURIC-ACID ULTRAFINE PARTICLES SIZE DISTRIBUTION ATMOSPHERIC PARTICLES PARTICULATE MATTER MAJOR HIGHWAY BLACK CARBON
DOI	10.5194/acp-17-9469-2017
英文摘要	This study is the first to use two identical Fast Mobility Particle Sizers for simultaneous measurement of particle number size distributions (PNSDs) at a street site and a rooftop site within 500m distance in wintertime and springtime to investigate new particle formation (NPF) in Beijing. The collected datasets at 1 s time resolution allow deduction of the freshly emitted traffic particle signal from the measurements at the street site and thereby enable the evaluation of the effects on NPF in an urban atmosphere through a site-by-site comparison. The number concentrations of 8 to 20 nm newly formed particles and the apparent formation rate (FR) in the springtime were smaller at the street site than at the rooftop site. In contrast, NPF was enhanced in the wintertime at the street site with FR increased by a factor of 3 to 5, characterized by a shorter NPF time and higher new particle yields than at the rooftop site. Our results imply that the street canyon likely exerts distinct effects on NPF under warm or cold ambient temperature conditions because of on-road vehicle emissions, i.e., stronger condensation sinks that may be responsible for the reduced NPF in the springtime but efficient nucleation and partitioning of gaseous species that contribute to the enhanced NPF in the wintertime. The occurrence or absence of apparent growth for new particles with mobility diameters larger than 10 nm was also analyzed. The oxidization of biogenic organics in the presence of strong photochemical reactions is suggested to play an important role in growing new particles with diameters larger than 10 nm, but sulfuric acid is unlikely to be the main species for the apparent growth. However, the number of datasets used in this study is relatively small, and larger datasets are essential to draw a general conclusion.; National Program on Key Basic Research Project (973 Program) [2014CB953703]; National Natural Science Foundation of China (NFSC) [41576118]; SCI(E); ARTICLE; 15; 9469-9484; 17
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471551]
专题	环境科学与工程学院
推荐引用方式 GB/T 7714	Zhu, Yujiao,Yan, Caiqing,Zhang, Renyi,et al. Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017.
APA	Zhu, Yujiao.,Yan, Caiqing.,Zhang, Renyi.,Wang, Zifa.,Zheng, Mei.,...&Yao, Xiaohong.(2017).Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site.ATMOSPHERIC CHEMISTRY AND PHYSICS.
MLA	Zhu, Yujiao,et al."Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site".ATMOSPHERIC CHEMISTRY AND PHYSICS (2017).