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COVID-19 induced lower-tropospheric ozone changes

Mertens, Mariano and Jöckel, Patrick and Matthes, Sigrun and Nützel, Matthias and Grewe, Volker and Sausen, Robert (2021) COVID-19 induced lower-tropospheric ozone changes. Environmental Research Letters. Institute of Physics (IOP) Publishing. doi: 10.1088/1748-9326/abf191. ISSN 1748-9326.

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Official URL: http://iopscience.iop.org/article/10.1088/1748-9326/abf191


The recent COVID-19 pandemic with its countermeasures, e.g., lock-downs, resulted in decreases in emissions of various trace gases. Here we investigate the changes of ozone over Europe associated with these emission reductions using a coupled global/regional chemistry climate model. We conducted and analysed a business as usual (BAU) and a sensitivity (COVID19) simulation. A source apportionment (tagging) technique allows us to make a sector-wise attribution of these changes, e.g. to natural and anthropogenic sectors such as land transport. Our simulation results show a decrease of ozone of 8% over Europe in May 2020 due to the emission reductions. The simulated reductions are in line with observed changes in ground level ozone. The source apportionment results show that this decrease is mainly due to the decreased ozone precursors from anthropogenic origin. Further, our results show that the ozone reduction is much smaller than the reduction of the total NOx emissions (around 20 %), mainly caused by an increased ozone production efficiency. This means that more ozone is produced for each emitted NOx molecule. Hence, more ozone is formed from natural emissions and the ozone productivities of the remaining anthropogenic emissions increase. Our results show that politically induced emissions reductions cannot simply be transferred to ozone reductions, which needs to be considered when designing mitigation strategies.

Item URL in elib:https://elib.dlr.de/142221/
Document Type:Article
Title:COVID-19 induced lower-tropospheric ozone changes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mertens, MarianoDLR, IPAhttps://orcid.org/0000-0003-3549-6889UNSPECIFIED
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394UNSPECIFIED
Matthes, SigrunDLR, IPAhttps://orcid.org/0000-0002-5114-2418UNSPECIFIED
Grewe, VolkerDLR, IPAhttps://orcid.org/0000-0002-8012-6783UNSPECIFIED
Sausen, RobertDLR, IPAhttps://orcid.org/0000-0002-9572-2393UNSPECIFIED
Date:24 March 2021
Journal or Publication Title:Environmental Research Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Publisher:Institute of Physics (IOP) Publishing
Keywords:Verkehr, Covid-19, Luftqualität, Emissionen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Transport und Klima (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Mertens, Mariano
Deposited On:17 May 2021 08:28
Last Modified:24 May 2022 23:47

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