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Journal Articles Geophysical Research Letters Year : 2021

COVID-19 Crisis Reduces Free Tropospheric Ozone across the Northern Hemisphere

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Rigel Kivi
Norrie Lyall
  • Function : Author
Justus Notholt
Gérard Ancellet
  • Function : Author
  • PersonId : 915258
Sophie Godin-Beekmann
Kimberly Strong
Thierry Leblanc
  • Function : Author
  • PersonId : 981408
Anne M. Thompson

Abstract

Throughout spring and summer 2020, ozone stations in the northern extratropics recorded unusually low ozone in the free troposphere. From April to August, and from 1 to 8 kilometers altitude, ozone was on average 7% (≈4 nmol/mol) below the 2000 to 2020 climatological mean. Such low ozone, over several months, and at so many stations, has not been observed in any previous year since at least 2000. Atmospheric composition analyses from the Copernicus Atmosphere Monitoring Service and simulations from the NASA GMI model indicate that the large 2020 springtime ozone depletion in the Arctic stratosphere contributed less than one quarter of the observed tropospheric anomaly. The observed anomaly is consistent with recent chemistry‐climate model simulations, which assume emissions reductions similar to those caused by the COVID‐19 crisis. COVID‐19 related emissions reductions appear to be the major cause for the observed reduced free tropospheric ozone in 2020.
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Dates and versions

insu-03137114 , version 1 (10-02-2021)
insu-03137114 , version 2 (27-02-2021)

Licence

Attribution - NonCommercial - CC BY 4.0

Identifiers

Cite

Wolfgang Steinbrecht, Dagmar Kubistin, Christian Plass-Dülmer, Jonathan Davies, David W. Tarasick, et al.. COVID-19 Crisis Reduces Free Tropospheric Ozone across the Northern Hemisphere. Geophysical Research Letters, 2021, 48 (5), pp.e2020GL091987. ⟨10.1029/2020GL091987⟩. ⟨insu-03137114v2⟩
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