气候变化领域集成服务门户(CCPortal): Trends in primary and secondary particle number concentrations in urban and regional environments in NE Spain

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DOI	10.1016/j.atmosenv.2020.117982
	Trends in primary and secondary particle number concentrations in urban and regional environments in NE Spain
	Carnerero C.; Rivas I.; Reche C.; Pérez N.; Alastuey A.; Querol X.
发表日期	2021
ISSN	1352-2310
卷号	244
英文摘要	We analysed long-term datasets of ambient air concentrations of gaseous pollutants, black carbon (BC) and particle size distributions at an urban background air quality station (Barcelona, Spain; 2013–2019) and a regional background station (Montseny, Spain; 2014–2019). Using BC as a tracer of primary emissions, we segregated the aerosol load in modes and analysed their trends, considering all-year data and seasons separately. We also applied the positive matrix factorisation (PMF) receptor model to the particle size distributions to identify different sources that contribute to the particle number concentration. Our results show that the number concentration of primary particles decreased at the urban and regional background stations (−4.1 and −4.7% per year, respectively) along the period of study. This decrease was also observed for primary particles in the nucleation, Aitken and accumulation modes separately. This change leads to a decrease in condensation sinks (CS, −3.1 and −5.6% per year), that, together with an increase in temperatures (+1.5% per year in the urban background; +1.4% per year in the regional background), results in a markedly increasing trend in the contribution of new particle formation to the total number particle concentration (+17.7% and +11.9% per year). The total particle number concentration decreased in the urban background (−2.5% per year), whereas the trend increased for the regional background (+3.0% per year). The latter result is in contrast to most literature reports and is most likely due to higher insolation and increased biogenic VOC (BVOC) emissions that would enhance photonucleation, along with a marked decrease in the CS. An increasing trend in H2SO4 concentrations driven by increasing SO2 concentrations (+11.1% per year) could also be favouring the formation of new particles in the regional background, but it is not clear that the increasing trend in SO2 is real or it is related to a faulty maintenance of the instrumentation. Overall, we conclude that decreasing primary emissions results in a decrease in the total number concentrations of urban aerosols, despite the increase in the formation of new particles by photonucleation. Moreover, the total particle number concentration of regions downwind of the urban areas increases because new particle formation is more favoured and compensates for the primary particles’ number concentration decrease. © 2020 Elsevier Ltd
关键词	New particle formation Photonucleation Positive matrix factorisation receptor model Trend analysis Ultrafine particles
语种	英语
scopus关键词	Aerosols; Air quality; Fog; Particulate emissions; Size distribution; Sulfur dioxide; Ambient air concentration; New particle formation; Number concentration; Particle concentrations; Particle number concentration; Positive matrix factorisation; Regional environments; Total number concentrations; Particle size; black carbon; aerosol; air quality; ambient air; black carbon; concentration (composition); particle size; seasonal variation; spatiotemporal analysis; temperature effect; aerosol; air quality; ambient air; Article; combustion; concentration (parameter); controlled study; environmental impact; exhaust gas; high temperature; non-negative matrix factorization; particle size; priority journal; season; separation technique; Spain; sunlight; urban area; Barcelona [Catalonia]; Catalonia; Montseny; Spain
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248812
作者单位	Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, 08034, Spain; Dept. of Civil and Environmental Engineering, Universitat Politècnica de Catalunya, Barcelona, 08034, Spain; ISGlobal, Barcelona Institute for Global Health, Barcelona, 08036, Spain
推荐引用方式 GB/T 7714	Carnerero C.,Rivas I.,Reche C.,et al. Trends in primary and secondary particle number concentrations in urban and regional environments in NE Spain[J],2021,244.
APA	Carnerero C.,Rivas I.,Reche C.,Pérez N.,Alastuey A.,&Querol X..(2021).Trends in primary and secondary particle number concentrations in urban and regional environments in NE Spain.ATMOSPHERIC ENVIRONMENT,244.
MLA	Carnerero C.,et al."Trends in primary and secondary particle number concentrations in urban and regional environments in NE Spain".ATMOSPHERIC ENVIRONMENT 244(2021).