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

Wolfgang Steinbrecht 1, * Dagmar Kubistin 1 Christian Plass-Dülmer 1 Jonathan Davies 2 David W. Tarasick 2 Peter von Der Gathen 3 Holger Deckelmann 3 Nis Jepsen 4 Rigel Kivi 5 Norrie Lyall 6 Matthias Palm 7 Justus Notholt 7 Bogumil Kois 8 Peter Oelsner 1 Marc Allaart 9 Ankie Piters 9 Michael Gill 10 Roeland van Malderen 11 Andy W. Delcloo 11 Ralf Sussmann 12 Emmanuel Mahieu 13 Christian Servais 13 Gonzague Romanens 14 Rene Stübi 14 Gérard Ancellet 15 Sophie Godin-Beekmann 16 Shoma yamanouchi 17 Kimberly Strong 17 Bryan Johnson 18 Patrick Cullis 18, 19 Irina Petropavlovskikh 19, 18 James W. Hannigan 20 Jose-Luis Hernandez 21 Ana Diaz Rodriguez 21 Tatsumi Nakano 22 Fernando Chouza 23 Thierry Leblanc 23 Carlos Torres 21 Omaira Garcia 21 Amelie N. Röhling 24 Matthias Schneider 24 Thomas Blumenstock 24 Matt Tully 25 Clare Paton-Walsh 26 Nicholas Jones 26 Richard Querel 27 Susan Strahan 28 Ryan M. Stauffer 29, 28 Anne M. Thompson 28 Antje Inness 30 Richard Engelen 30 Kai-Lan Chang 31, 19 Owen R. Cooper 31, 19 
* Corresponding author
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
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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Submitted on : Saturday, February 27, 2021 - 8:41:43 PM
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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, American Geophysical Union, 2021, 48 (5), pp.e2020GL091987. ⟨10.1029/2020GL091987⟩. ⟨insu-03137114v2⟩



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