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DOI	10.5194/acp-19-5679-2019
	Analysis of new particle formation (NPF) events at nearby rural; urban background and urban roadside sites
	Bousiotis D.; Dall'Osto M.; Beddows D.C.S.; Pope F.D.; Harrison R.M.
发表日期	2019
ISSN	16807316
起始页码	5679
结束页码	5694
卷号	19 期号:8
英文摘要	New particle formation (NPF) events have different patterns of development depending on the conditions of the area in which they occur. In this study, particle size distributions in the range of 16.6-604 nm (7 years of data) were analysed and NPF events occurring at three sites of differing characteristics - rural Harwell (HAR), urban background North Kensington (NK), urban roadside Marylebone Road (MR), London, UK - were extracted and studied. The different atmospheric conditions in each study area not only have an effect on the frequency of the events, but also affect their development. The frequency of NPF events is similar at the rural and urban background locations (about 7% of days), with a high proportion of events occurring at both sites on the same day (45 %). The frequency of NPF events at the urban roadside site is slightly less (6% of days), and higher particle growth rates (average 5.5 nm h-1 at MR compared to 3.4 and 4.2 nm h-1 at HAR and NK respectively) must result from rapid gas-to-particle conversion of traffic-generated pollutants. A general pattern is found in which the condensation sink increases with the degree of pollution of the site, but this is counteracted by increased particle growth rates at the more polluted location. A key finding of this study is that the role of the urban environment leads to an increment of 20% in N16-20 nm in the urban background compared to that of the rural area in NPF events occurring at both sites. The relationship of the origin of incoming air masses is also considered and an association of regional events with cleaner air masses is found. Due to lower availability of condensable species, NPF events that are associated with cleaner atmospheric conditions have lower growth rates of the newly formed particles. The decisive effect of the condensation sink in the development of NPF events and the survivability of the newly formed particles is underlined, and influences the overall contribution of NPF events to the number of ultrafine particles in an area. The other key factor identified by this study is the important role that pollution, both from traffic and other sources in the urban environment (such as heating or cooking), plays in new particle formation events. © Author(s) 2019.
语种	英语
scopus关键词	air mass; condensation; particle size; particulate matter; roadside environment; rural atmosphere; size distribution; urban atmosphere; City of Westminster; England; Kensington and Chelsea; London [England]; Marylebone; North Kensington; United Kingdom
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144450
作者单位	School of Geography, Earth and Environmental Sciences and National Centre for Atmospheric Science, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; Institute of Marine Sciences, CSIC, Passeig Marítim de la Barceloneta 37-49, Barcelona, 08003, Spain; Department of Environmental Sciences, Center of Excellence in Environmental Studies, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia
推荐引用方式 GB/T 7714	Bousiotis D.,Dall'Osto M.,Beddows D.C.S.,et al. Analysis of new particle formation (NPF) events at nearby rural; urban background and urban roadside sites[J],2019,19(8).
APA	Bousiotis D.,Dall'Osto M.,Beddows D.C.S.,Pope F.D.,&Harrison R.M..(2019).Analysis of new particle formation (NPF) events at nearby rural; urban background and urban roadside sites.Atmospheric Chemistry and Physics,19(8).
MLA	Bousiotis D.,et al."Analysis of new particle formation (NPF) events at nearby rural; urban background and urban roadside sites".Atmospheric Chemistry and Physics 19.8(2019).