DOI: 10.1016/j.atmosenv.2017.07.013
Scopus记录号: 2-s2.0-85023620727
论文题名: Quantifying primary and secondary source contributions to ultrafine particles in the UK urban background
作者: Hama S ; M ; L ; , Cordell R ; L ; , Monks P ; S
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 166 起始页码: 62
结束页码: 78
语种: 英语
英文关键词: Primary sources
; Secondary sources
; Ultrafine particles
; Urban background
Scopus关键词: Air pollution
; Carbon
; Fog
; Nitrogen compounds
; Nitrogen oxides
; Particles (particulate matter)
; Particulate emissions
; Pollution
; Maximum concentrations
; New particle formation
; Primary sources
; Secondary sources
; Ultrafine particle
; Urban background
; Vehicle exhaust emissions
; Wind speed and directions
; Urban growth
; black carbon
; carbon monoxide
; nitrogen dioxide
; nitrogen oxide
; ozone
; black carbon
; climatology
; concentration (composition)
; exhaust emission
; in situ measurement
; particle size
; particulate matter
; pollutant source
; quantitative analysis
; tracer
; urban area
; wind velocity
; air pollutant
; air quality
; Article
; climate
; cooling
; data analysis
; dilution
; exhaust gas
; humidity
; particulate matter
; priority journal
; spring
; temperature
; ultrafine particle
; United Kingdom
; urban area
; wind
; England
; Leicester [England]
; United Kingdom
; United Kingdom
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Total particle number (TNC, ≥7 nm diameter), particulate matter (PM2.5), equivalent black carbon (eBC) and gaseous pollutants (NO, NO2, NOx, O3, CO) have been measured at an urban background site in Leicester over two years (2014 and 2015). A derived chemical climatology for the pollutants showed maximum concentrations for all pollutants during the cold period except O3 which peaked during spring. Quantification of primary and secondary sources of ultrafine particles (UFPs) was undertaken using eBC as a tracer for the primary particle number concentration in the Leicester urban area. At the urban background site, which is influenced by fresh vehicle exhaust emissions, TNC was segregated into two components, TNC = N1 + N2. The component N1 represents components directly emitted as particles and compounds which nucleate immediately after emission. The component N2 represents the particles formed during the dilution and cooling of vehicle exhaust emissions and by in situ new particle formation (NPF). The values of highest N1 (49%) were recorded during the morning rush hours (07:00–09:00 h), correlating with NOx, while the maximum contribution of N2 to TNC was found at midday (11:00–14:00 h), at around 62%, correlated with O3. Generally, the percentage of N2 (57%) was greater than the percentage of N1 (43%) for all days at the AURN site over the period of the study. For the first time the impact of wind speed and direction on N1 and N2 was explored. The overall data analysis shows that there are two major sources contributing to TNC in Leicester: primary sources (traffic emissions) and secondary sources, with the majority of particles being of secondary origin. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82752
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Chemistry, University of Leicester, Leicester LE1 7RH, United Kingdom; Department of Chemistry, School of Science, University of Sulaimani, Sulaimani, Iraq
Recommended Citation:
Hama S,M,L,et al. Quantifying primary and secondary source contributions to ultrafine particles in the UK urban background[J]. Atmospheric Environment,2017-01-01,166