COVID-19 Crisis Reduces Free Tropospheric Ozone across the Northern Hemisphere - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2021

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

1 DWD - Deutscher Wetterdienst [Offenbach]
2 ECCC - Environment and Climate Change Canada
3 AWI - Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine
4 DMI - Danish Meteorological Institute
5 FMI - Finnish Meteorological Institute
6 Met Office Lerwick
7 Universität Bremen
8 IMGW - PIB - Institute of Meteorology and Water Management - National Research Institute
9 KNMI - Royal Netherlands Meteorological Institute
10 MET ÉIREANN - Irish Meteorological Service
11 IRM - Institut Royal Météorologique de Belgique [Bruxelles] - Royal Meteorological Institute of Belgium
12 IMK-IFU - Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung
13 Institut d'Astrophysique et de Géophysique [Liège]
14 Federal Office of Meteorology and Climatology MeteoSwiss
17 University of Toronto
18 GML - ESRL Global Monitoring Laboratory [Boulder]
19 CIRES - Cooperative Institute for Research in Environmental Sciences
20 NCAR - National Center for Atmospheric Research [Boulder]
21 AEMet - Agencia Estatal de Meteorología
22 MRI - Meteorological Research Institute [Tsukuba]
23 JPL - Jet Propulsion Laboratory
24 IMK-ASF - Institut für Meteorologie und Klimaforschung - Atmosphärische Spurengase und Fernerkundung
25 BoM - Australian Bureau of Meteorology [Melbourne]
26 University of Wollongong [Australia]
27 NIWA - National Institute of Water and Atmospheric Research [Lauder]
28 GSFC Earth Sciences Division
29 ESSIC - Earth Science System Interdisciplinary Center [College Park]
30 ECMWF - European Centre for Medium-Range Weather Forecasts
31 CSL - NOAA Chemical Sciences Laboratory
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


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)


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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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