气候变化领域集成服务门户(CCPortal): Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London

CCPortal

DOI	10.5194/acp-23-2315-2023
	Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London
	Cliff, Samuel J.; Drysdale, Will; Lee, James D.; Helfter, Carole; Nemitz, Eiko; Metzger, Stefan; Barlow, Janet F.
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2315
结束页码	2330
卷号	23 期号:4 页码:16
英文摘要	Fluxes of nitrogen oxides (NOx=NO+NO2) and carbon dioxide (CO2) were measured using eddy covariance at the British Telecommunications (BT) Tower in central London during the coronavirus pandemic. Comparing fluxes to those measured in 2017 prior to the pandemic restrictions and the introduction of the Ultra-Low Emissions Zone (ULEZ) highlighted a 73 % reduction in NOx emissions between the two periods but only a 20 % reduction in CO2 emissions and a 32 % reduction in traffic load. Use of a footprint model and the London Atmospheric Emissions Inventory (LAEI) identified transport and heat and power generation to be the two dominant sources of NOx and CO2 but with significantly different relative contributions for each species. Application of external constraints on NOx and CO2 emissions allowed the reductions in the different sources to be untangled, identifying that transport NOx emissions had reduced by > 73 % since 2017. This was attributed in part to the success of air quality policy in central London but crucially due to the substantial reduction in congestion that resulted from pandemic-reduced mobility. Spatial mapping of the fluxes suggests that central London was dominated by point source heat and power generation emissions during the period of reduced mobility. This will have important implications on future air quality policy for NO2 which, until now, has been primarily focused on the emissions from diesel exhausts.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000936003700001
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/273314
作者单位	University of York - UK; UK Centre for Ecology & Hydrology (UKCEH); University of Wisconsin System; University of Wisconsin Madison; University of Reading
推荐引用方式 GB/T 7714	Cliff, Samuel J.,Drysdale, Will,Lee, James D.,et al. Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London[J],2023,23(4):16.
APA	Cliff, Samuel J..,Drysdale, Will.,Lee, James D..,Helfter, Carole.,Nemitz, Eiko.,...&Barlow, Janet F..(2023).Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),16.
MLA	Cliff, Samuel J.,et al."Pandemic restrictions in 2020 highlight the significance of non-road NOx sources in central London".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):16.