气候变化领域集成服务门户(CCPortal): How have surface NO2concentrations changed as a result of the UK's COVID-19 travel restrictions?

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DOI	10.1088/1748-9326/abb6a2
	How have surface NO2concentrations changed as a result of the UK's COVID-19 travel restrictions?
	Dacre H.F.; Mortimer A.H.; Neal L.S.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Restrictions as a result of the COVID-19 pandemic have led to fewer vehicles on UK roads. Since fuel combustion is responsible for a large fraction of UK emissions it is expected that surface NO2 concentrations would reduce as a result. However*over parts of the UK, surface NO2 concentrations have increased following the implementation of travel restrictions. NO2 measurements from 142 Automatic Urban and Rural Network sites are combined with meteorological data from the Met Office high-resolution weather prediction model to build site specific models. These models predict NO2 concentrations given no change in emissions. It is found that both meteorological and emission changes contribute to the observed changes in NO2 concentrations. Given no change in emissions, changes in meteorology between pre-and post-lockdown periods would have led to a mean increase in NO2 concentrations of +6%. Conversely, changes in emissions would have led to a mean reduction in NO2 concentrations of-18%, resulting in the observed total change in NO2 concentrations of-12%. However at some sites the reduction in emissions is smaller than the increase in NO2 concentrations due to meteorology. The largest increases associated with changes in the meteorology are seen at rural sites (+20%) where NO2 measurements are representative of large areas and thus dominated by the regional advection of secondary NO2 from Europe. Conversely, the largest decreases associated with reduced emissions are found at urban traffic and urban background sites (-27% and-14% respectively) where NO2 concentrations are representative of local areas and thus dominated by local reduction in emissions from vehicles. As lockdown measures are relaxed, NO2 concentrations are likely to return to pre-COVID levels, but these results demonstrate that changes in our behaviour can result in positive impacts on air quality and illustrate the effectiveness of travel-reducing strategies in urban areas. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	air quality; atmospheric dispersion; COVID-19
语种	英语
scopus关键词	Air quality; Fuels; Meteorology; Predictive analytics; Reduction; Rural areas; Urban growth; Emission change; Fuel combustion; High resolution; Meteorological data; Travel restrictions; Urban and rural; Urban background; Weather prediction model; Nitrogen oxides; concentration (composition); nitrogen oxides; viral disease; United Kingdom
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153596
作者单位	Department of Meteorology, University of Reading, Reading, United Kingdom; Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot, United Kingdom; Met Office, Fitzroy Road, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Dacre H.F.,Mortimer A.H.,Neal L.S.. How have surface NO2concentrations changed as a result of the UK's COVID-19 travel restrictions?[J],2020,15(10).
APA	Dacre H.F.,Mortimer A.H.,&Neal L.S..(2020).How have surface NO2concentrations changed as a result of the UK's COVID-19 travel restrictions?.Environmental Research Letters,15(10).
MLA	Dacre H.F.,et al."How have surface NO2concentrations changed as a result of the UK's COVID-19 travel restrictions?".Environmental Research Letters 15.10(2020).