气候变化领域集成服务门户(CCPortal): Traffic-originated nanocluster emission exceeds H2SO4-driven photochemical new particle formation in an urban area

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DOI	10.5194/acp-20-1-2020
	Traffic-originated nanocluster emission exceeds H2SO4-driven photochemical new particle formation in an urban area
	Olin M.; Kuuluvainen H.; Aurela M.; Kalliokoski J.; Kuittinen N.; Isotalo M.; Timonen H.J.; Niemi J.V.; Rönkkö T.; Dal Maso M.
发表日期	2020
ISSN	1680-7316
起始页码	1
结束页码	13
卷号	20 期号:1
英文摘要	Elevated ambient concentrations of sub-3 nm particles (nanocluster aerosol, NCA) are generally related to atmospheric new particle formation events, usually linked with gaseous sulfuric acid (H2SO4) produced via photochemical oxidation of sulfur dioxide. According to our measurement results of H2SO4 and NCA concentrations, traffic density, and solar irradiance at an urban traffic site in Helsinki, Finland, the view of aerosol formation in traffic-influenced environments is updated by presenting two separate and independent pathways of traffic affecting the atmospheric NCA concentrations: by acting as a direct nanocluster source and by influencing the production of H2SO4. As traffic density in many areas is generally correlated with solar radiation, it is likely that the influence of traffic-related nanoclusters has been hidden in the diurnal variation and is thus underestimated because new particle formation events also follow the diurnal cycle of sunlight. Urban aerosol formation studies should, therefore, be updated to include the proposed formation mechanisms. The formation of H2SO4 in urban environments is here separated into two routes: primary H2SO4 is formed in hot vehicle exhaust and is converted rapidly to the particle phase; secondary H2SO4 results from the combined effect of emitted gaseous precursors and available solar radiation. A rough estimation demonstrates that ∼ 85% of the total NCA and ∼ 68% of the total H2SO4 in urban air at noontime at the measurement site are contributed by traffic, indicating the importance of traffic emissions. © Author(s) 2020.
语种	英语
scopus关键词	aerosol; concentration (composition); oxidation; particulate matter; photochemistry; sulfur dioxide; sulfuric acid; traffic emission; urban atmosphere; Finland; Helsinki; Varsinais-Suomi
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/248072
作者单位	Aerosol Physics Laboratory, Physics Unit, Tampere University, Tampere, 33014, Finland; Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki, 00101, Finland; Helsinki Region Environmental Services Authority (HSY), Helsinki, 00066, Finland
推荐引用方式 GB/T 7714	Olin M.,Kuuluvainen H.,Aurela M.,et al. Traffic-originated nanocluster emission exceeds H2SO4-driven photochemical new particle formation in an urban area[J],2020,20(1).
APA	Olin M..,Kuuluvainen H..,Aurela M..,Kalliokoski J..,Kuittinen N..,...&Dal Maso M..(2020).Traffic-originated nanocluster emission exceeds H2SO4-driven photochemical new particle formation in an urban area.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(1).
MLA	Olin M.,et al."Traffic-originated nanocluster emission exceeds H2SO4-driven photochemical new particle formation in an urban area".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.1(2020).