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

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 500 m distance in wintertime and springtime to investigate new particle formation (NPF) in Beijing. The...

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Main Authors: Y. Zhu, C. Yan, R. Zhang, Z. Wang, M. Zheng, H. Gao, Y. Gao, X. Yao
Format: Article
Language:English
Published: Copernicus Publications 2017-08-01
Series:Atmospheric Chemistry and Physics
Online Access:https://www.atmos-chem-phys.net/17/9469/2017/acp-17-9469-2017.pdf
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spelling doaj-0cc96f0df5bf4fd2b05a319c9931c3dc2020-11-24T23:55:12ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242017-08-01179469948410.5194/acp-17-9469-2017Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop siteY. Zhu0Y. Zhu1C. Yan2C. Yan3R. Zhang4R. Zhang5Z. Wang6M. Zheng7H. Gao8Y. Gao9X. Yao10X. Yao11Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, ChinaThese authors contributed equally to this work.State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, ChinaThese authors contributed equally to this work.State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, ChinaDepartments of Atmospheric Sciences and Chemistry, Center for the Atmospheric Chemistry and the Environment, Texas A&M University, College Station, TX 77843, USAState Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, ChinaState Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, ChinaKey Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, ChinaKey Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, ChinaKey Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, ChinaQiangdao Collaborative Center of Marine Science and Technology, Qingdao 266100, ChinaThis 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 500 m 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.https://www.atmos-chem-phys.net/17/9469/2017/acp-17-9469-2017.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Y. Zhu
Y. Zhu
C. Yan
C. Yan
R. Zhang
R. Zhang
Z. Wang
M. Zheng
H. Gao
Y. Gao
X. Yao
X. Yao
spellingShingle Y. Zhu
Y. Zhu
C. Yan
C. Yan
R. Zhang
R. Zhang
Z. Wang
M. Zheng
H. Gao
Y. Gao
X. Yao
X. Yao
Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
Atmospheric Chemistry and Physics
author_facet Y. Zhu
Y. Zhu
C. Yan
C. Yan
R. Zhang
R. Zhang
Z. Wang
M. Zheng
H. Gao
Y. Gao
X. Yao
X. Yao
author_sort Y. Zhu
title Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
title_short Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
title_full Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
title_fullStr Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
title_full_unstemmed Simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
title_sort simultaneous measurements of new particle formation at 1 s time resolution at a street site and a rooftop site
publisher Copernicus Publications
series Atmospheric Chemistry and Physics
issn 1680-7316
1680-7324
publishDate 2017-08-01
description 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 500 m 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.
url https://www.atmos-chem-phys.net/17/9469/2017/acp-17-9469-2017.pdf
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