Diagnosing air quality changes in the UK during the COVID-19 lockdown using TROPOMI and GEOS-Chem

The dramatic and sudden reduction in anthropogenic activity due to lockdown measures in the UK in response to the COVID-19 outbreak has resulted in a concerted effort to estimate local and regional changes in air quality, though changes in underlying emissions remain uncertain. Here we combine satel...

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Vydáno v:Environmental research letters Ročník 16; číslo 5; s. 54031 - 54043
Hlavní autoři: Potts, Daniel A, Marais, Eloise A, Boesch, Hartmut, Pope, Richard J, Lee, James, Drysdale, Will, Chipperfield, Martyn P, Kerridge, Brian, Siddans, Richard, Moore, David P, Remedios, John
Médium: Journal Article
Jazyk:angličtina
Vydáno: Bristol IOP Publishing 01.05.2021
Témata:
Air pollution
Air pollution control
Air quality
Anthropogenic factors
atmospheric chemistry modelling
Chemical transport
Coronaviruses
COVID-19
Emissions
Emissions control
Meteorology
Monitoring instruments
Nitrogen dioxide
Nitrogen oxides
Ozone
Particulate matter
Pollution abatement
satellite NO
satellite NO2
Satellite observation
Shelter in place
Three dimensional models
Troposphere
United Kingdom > UK
ISSN:1748-9326, 1748-9326
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Shrnutí:The dramatic and sudden reduction in anthropogenic activity due to lockdown measures in the UK in response to the COVID-19 outbreak has resulted in a concerted effort to estimate local and regional changes in air quality, though changes in underlying emissions remain uncertain. Here we combine satellite observations of tropospheric NO 2 from TROPOspheric Monitoring Instrument and the Goddard Earth Observing System (GEOS)-Chem 3D chemical transport model to estimate that NO x emissions declined nationwide by ∼20% during the lockdown (23 March to 31 May 2020). Regionally, these range from 22% to 23% in the western portion of the country to 29% in the southeast and Manchester, and >40% in London. We apply a uniform 20% lockdown period emission reduction to GEOS-Chem anthropogenic emissions over the UK to determine that decline in lockdown emissions led to a national decline in PM 2.5 of 1.1 μ g m −3 , ranging from 0.6 μ g m −3 in Scotland to 2 μ g m −3 in the southwest. The decline in emissions in cities (>40%) is greater than the national average and causes an increase in ozone of ∼2 ppbv in London and Manchester. The change in ozone and PM 2.5 concentrations due to emission reductions alone is about half the total change from 2019 to 2020. This emphasizes the need to account for emissions and other factors, in particular meteorology, in future air pollution abatement strategies and regulatory action.
Bibliografie:ERL-110160.R1
ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1748-9326
1748-9326
DOI:10.1088/1748-9326/abde5d