气候变化领域集成服务门户(CCPortal): Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown

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DOI	10.1016/j.atmosres.2021.105755
	Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown
	Pavón-Domínguez P.; Plocoste T.
发表日期	2021
ISSN	0169-8095
卷号	261
英文摘要	Due to COVID-19 pandemic, the lockdown effects on air pollution level are undeniable. Several studies around the world have detected an uneven behaviour in tropospheric ozone (O3) concentrations. In this work, Seville (Spain) is used as example of faced to traffic place in which the nitrogen dioxide (NO2) is drastically reduced (41%) while O3 has no significant changes. In order to evaluate the existence of differences in O3 behaviour that is not detected by statistical procedures, a multifractal approach was used to assess the coupled scale relationship between NO2 and O3 during the 2020 lockdown against a period reference (2017–2019). For this purpose, the two main coupled multifractal method were employed: multifractal detrended cross-correlation and joint multifractal analysis. While cross-correlation analysis did not detect differences between the cross-correlated fluctuations of NO2 and O3 in the periods analysed, the joint multifractal analysis, based on the partition function and the method of moments, found a loss of variability in O3 during the lockdown. This leads to a loss of multifractal characteristic of O3 time series. The drastically reduction of primary pollutants during the lockdown might be the responsible of the tendency to monofractality in O3 time series. These differences were found for a wide temporal extent ranging from 80 min to ~28 days. © 2021 Elsevier B.V.
英文关键词	COVID-19; Multifractal analysis; Nitrogen dioxide; Ozone; Traffic area
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/236655
作者单位	Graphical Methods, Optimization and Learning (GOAL) TIC-259 Research Group, Department of Mechanical Engineering and Industrial Design, Universidad de Cádiz, Avenida de la Universidad de Cádiz, Puerto Real, Cádiz 11519, Spain; Department of Research in Geoscience, KaruSphère SASU, Abymes, Guadeloupe (F.W.I.) 97139, France; Univ Antilles, LaRGE Laboratoire de Recherche en Géosciences et Energies (EA 4539), Pointe-à-Pitre, F-97100, France
推荐引用方式 GB/T 7714	Pavón-Domínguez P.,Plocoste T.. Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown[J],2021,261.
APA	Pavón-Domínguez P.,&Plocoste T..(2021).Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown.Atmospheric Research,261.
MLA	Pavón-Domínguez P.,et al."Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown".Atmospheric Research 261(2021).