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Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown
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 (O(3)) concentrations. In this work, Seville (Spain) is used as example of faced to traffic place in which the nitrogen dioxi...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier B.V.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9756894/ https://www.ncbi.nlm.nih.gov/pubmed/36540717 http://dx.doi.org/10.1016/j.atmosres.2021.105755 |
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author | Pavón-Domínguez, Pablo Plocoste, Thomas |
author_facet | Pavón-Domínguez, Pablo Plocoste, Thomas |
author_sort | Pavón-Domínguez, Pablo |
collection | PubMed |
description | 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 (O(3)) concentrations. In this work, Seville (Spain) is used as example of faced to traffic place in which the nitrogen dioxide (NO(2)) is drastically reduced (41%) while O(3) has no significant changes. In order to evaluate the existence of differences in O(3) behaviour that is not detected by statistical procedures, a multifractal approach was used to assess the coupled scale relationship between NO(2) and O(3) 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 NO(2) and O(3) in the periods analysed, the joint multifractal analysis, based on the partition function and the method of moments, found a loss of variability in O(3) during the lockdown. This leads to a loss of multifractal characteristic of O(3) time series. The drastically reduction of primary pollutants during the lockdown might be the responsible of the tendency to monofractality in O(3) time series. These differences were found for a wide temporal extent ranging from 80 min to ~28 days. |
format | Online Article Text |
id | pubmed-9756894 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Elsevier B.V. |
record_format | MEDLINE/PubMed |
spelling | pubmed-97568942022-12-16 Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown Pavón-Domínguez, Pablo Plocoste, Thomas Atmos Res Article 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 (O(3)) concentrations. In this work, Seville (Spain) is used as example of faced to traffic place in which the nitrogen dioxide (NO(2)) is drastically reduced (41%) while O(3) has no significant changes. In order to evaluate the existence of differences in O(3) behaviour that is not detected by statistical procedures, a multifractal approach was used to assess the coupled scale relationship between NO(2) and O(3) 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 NO(2) and O(3) in the periods analysed, the joint multifractal analysis, based on the partition function and the method of moments, found a loss of variability in O(3) during the lockdown. This leads to a loss of multifractal characteristic of O(3) time series. The drastically reduction of primary pollutants during the lockdown might be the responsible of the tendency to monofractality in O(3) time series. These differences were found for a wide temporal extent ranging from 80 min to ~28 days. Elsevier B.V. 2021-10-15 2021-07-02 /pmc/articles/PMC9756894/ /pubmed/36540717 http://dx.doi.org/10.1016/j.atmosres.2021.105755 Text en © 2021 Elsevier B.V. All rights reserved. Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active. |
spellingShingle | Article Pavón-Domínguez, Pablo Plocoste, Thomas Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown |
title | Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown |
title_full | Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown |
title_fullStr | Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown |
title_full_unstemmed | Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown |
title_short | Coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the COVID-19 lockdown |
title_sort | coupled multifractal methods to reveal changes in nitrogen dioxide and tropospheric ozone concentrations during the covid-19 lockdown |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9756894/ https://www.ncbi.nlm.nih.gov/pubmed/36540717 http://dx.doi.org/10.1016/j.atmosres.2021.105755 |
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