气候变化领域集成服务门户(CCPortal): Characterizing atmospheric controls on winter urban pollution in a topographic basin setting using Radon-222

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DOI	10.1016/j.atmosres.2019.104838
	Characterizing atmospheric controls on winter urban pollution in a topographic basin setting using Radon-222
	Kikaj D.; Chambers S.D.; Kobal M.; Crawford J.; Vaupotič J.
发表日期	2020
ISSN	0169-8095
卷号	237
英文摘要	Using hourly meteorological, air quality and radon observations over two winters (2016–2017 and 2017–2018), we combine diurnal and synoptic timescale radon-based mixing classification techniques, for the first time, to better understand air quality variability in the sub-Alpine city of Ljubljana. Of the two winters, only the second experienced significant snow cover (>1 month). A total of six mixing classes were defined for each winter: 5 diurnal and 1 synoptic (“persistent temperature inversion”, PTI); the latter being internally categorised as “strong” or “weak”. Diurnal and synoptic changes in mixing state played an important role in air quality variability in both winters. Little diurnal accumulation of local pollutants (CO, NO2, PM10 and BC) was observed for wind speeds ≥1.5 m s−1 (mixing classes #1 to #3). Under these windy conditions significant remote contributions to SO2 and O3 concentrations in Ljubljana were observed, primarily from the Po Valley region. The most stable conditions (class #5 and PTI days), characterized by nocturnal wind speeds ≤0.5 m s−1 or rates of 2 m air temperature change ≥1.5 °C h−1, were associated with the worst air quality conditions. Only under class #5 and PTI conditions did daily-mean PM10 concentrations exceed both EU and WHO guideline values. The absence of snow cover in the first winter resulted in stronger thermodynamic stability and higher pollution concentrations. Other contributing factors included a 28% larger traffic source near the monitoring site and a 17% greater consumption of heating fuel that winter in Ljubljana. © 2020 The Authors
英文关键词	Complex topography; Persistent temperature inversion; Radon; Stability; Urban pollution
学科领域	Air quality; C (programming language); Climatology; Convergence of numerical methods; Mixing; Radon; Snow; Topography; Wind; Air temperature changes; Atmospheric controls; Classification technique; Complex topographies; Contributing factor; Pollution concentration; Temperature inversions; Urban pollutions; Atmospheric temperature; air quality; complex terrain; diurnal variation; mixing; radon isotope; temperature inversion; urban pollution; winter; Ljubljana; Slovenia
语种	英语
scopus关键词	Air quality; C (programming language); Climatology; Convergence of numerical methods; Mixing; Radon; Snow; Topography; Wind; Air temperature changes; Atmospheric controls; Classification technique; Complex topographies; Contributing factor; Pollution concentration; Temperature inversions; Urban pollutions; Atmospheric temperature; air quality; complex terrain; diurnal variation; mixing; radon isotope; temperature inversion; urban pollution; winter; Ljubljana; Slovenia
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120457
作者单位	Jožef Stefan International Postgraduate School, Jamova cesta 39, Ljubljana, 1000, Slovenia; Jožef Stefan Institute, Department of Environmental Sciences, Jamova cesta 39, Ljubljana, 1000, Slovenia; ANSTO, Environmental Research, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia; Aerosol d.o.o, Kamniška ulica 39A, Ljubljana, 1000, Slovenia
推荐引用方式 GB/T 7714	Kikaj D.,Chambers S.D.,Kobal M.,et al. Characterizing atmospheric controls on winter urban pollution in a topographic basin setting using Radon-222[J],2020,237.
APA	Kikaj D.,Chambers S.D.,Kobal M.,Crawford J.,&Vaupotič J..(2020).Characterizing atmospheric controls on winter urban pollution in a topographic basin setting using Radon-222.Atmospheric Research,237.
MLA	Kikaj D.,et al."Characterizing atmospheric controls on winter urban pollution in a topographic basin setting using Radon-222".Atmospheric Research 237(2020).