Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact
A nonlinear change in baseline ozone concentrations at northern midlatitudes has been quantified over preceding decades. During the past few years, several studies, using linear trend analyses, report relatively small trends over selected time periods – results inconsistent with the earlier develope...
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ftdoajarticles:oai:doaj.org/article:fc4b8fb17c9b4788ab1f10f306dc8917 2023-05-15T15:11:21+02:00 Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact D. D. Parrish R. G. Derwent I. C. Faloona C. A. Mims 2022-10-01T00:00:00Z https://doi.org/10.5194/acp-22-13423-2022 https://doaj.org/article/fc4b8fb17c9b4788ab1f10f306dc8917 EN eng Copernicus Publications https://acp.copernicus.org/articles/22/13423/2022/acp-22-13423-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-13423-2022 1680-7316 1680-7324 https://doaj.org/article/fc4b8fb17c9b4788ab1f10f306dc8917 Atmospheric Chemistry and Physics, Vol 22, Pp 13423-13430 (2022) Physics QC1-999 Chemistry QD1-999 article 2022 ftdoajarticles https://doi.org/10.5194/acp-22-13423-2022 2022-12-30T19:49:13Z A nonlinear change in baseline ozone concentrations at northern midlatitudes has been quantified over preceding decades. During the past few years, several studies, using linear trend analyses, report relatively small trends over selected time periods – results inconsistent with the earlier developed picture. We show that reported COVID-19-related ozone changes in the background troposphere based on the linear analysis are significantly larger than those derived considering recent long-term decreases in background ozone, which the linear trend analyses do not quantify. We further point out that the extensive loss of lower stratospheric ozone in the unprecedented 2020 springtime Arctic stratospheric ozone depletion event likely reduced the natural source to the troposphere, rendering the background anomalously low that year. Consideration of these two issues indicates that the COVID-19 restrictions had a much smaller impact on background tropospheric ozone in 2020 than previously reported. A consensus understanding of baseline ozone changes and their causes is important for formulating policies to improve ozone air quality; cooperative, international emission control efforts aimed at continuing or even accelerating the ongoing decrease in hemisphere-wide background ozone concentrations may be the most effective approach to further reducing urban and rural ozone in the more developed northern midlatitude countries, as well as improving ozone air quality in all countries within these latitudes. Analysis of baseline ozone measurements over several years following the COVID-19 impact is expected to provide a firm basis for resolving the inconsistencies between the two views of long-term northern midlatitude ozone changes and better quantifying the COVID-19 impact. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 22 20 13423 13430 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 D. D. Parrish R. G. Derwent I. C. Faloona C. A. Mims Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact |
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Physics QC1-999 Chemistry QD1-999 |
description |
A nonlinear change in baseline ozone concentrations at northern midlatitudes has been quantified over preceding decades. During the past few years, several studies, using linear trend analyses, report relatively small trends over selected time periods – results inconsistent with the earlier developed picture. We show that reported COVID-19-related ozone changes in the background troposphere based on the linear analysis are significantly larger than those derived considering recent long-term decreases in background ozone, which the linear trend analyses do not quantify. We further point out that the extensive loss of lower stratospheric ozone in the unprecedented 2020 springtime Arctic stratospheric ozone depletion event likely reduced the natural source to the troposphere, rendering the background anomalously low that year. Consideration of these two issues indicates that the COVID-19 restrictions had a much smaller impact on background tropospheric ozone in 2020 than previously reported. A consensus understanding of baseline ozone changes and their causes is important for formulating policies to improve ozone air quality; cooperative, international emission control efforts aimed at continuing or even accelerating the ongoing decrease in hemisphere-wide background ozone concentrations may be the most effective approach to further reducing urban and rural ozone in the more developed northern midlatitude countries, as well as improving ozone air quality in all countries within these latitudes. Analysis of baseline ozone measurements over several years following the COVID-19 impact is expected to provide a firm basis for resolving the inconsistencies between the two views of long-term northern midlatitude ozone changes and better quantifying the COVID-19 impact. |
format |
Article in Journal/Newspaper |
author |
D. D. Parrish R. G. Derwent I. C. Faloona C. A. Mims |
author_facet |
D. D. Parrish R. G. Derwent I. C. Faloona C. A. Mims |
author_sort |
D. D. Parrish |
title |
Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact |
title_short |
Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact |
title_full |
Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact |
title_fullStr |
Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact |
title_full_unstemmed |
Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact |
title_sort |
technical note: northern midlatitude baseline ozone – long-term changes and the covid-19 impact |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-13423-2022 https://doaj.org/article/fc4b8fb17c9b4788ab1f10f306dc8917 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 22, Pp 13423-13430 (2022) |
op_relation |
https://acp.copernicus.org/articles/22/13423/2022/acp-22-13423-2022.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-22-13423-2022 1680-7316 1680-7324 https://doaj.org/article/fc4b8fb17c9b4788ab1f10f306dc8917 |
op_doi |
https://doi.org/10.5194/acp-22-13423-2022 |
container_title |
Atmospheric Chemistry and Physics |
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22 |
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20 |
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13423 |
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13430 |
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