COVID‐19 crisis reduces free tropospheric ozone across the Northern Hemisphere

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 2000–2020 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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Author Steinbrecht, Wolfgang
Kubistin, Dagmar
Plass‐Dülmer, Christian
Davies, Jonathan
Tarasick, David W.
Gathen, Peter von der
Deckelmann, Holger
Jepsen, Nis
Kivi, Rigel
Lyall, Norrie
Palm, Matthias
Notholt, Justus
Kois, Bogumil
Oelsner, Peter
Allaart, Marc
Piters, Ankie
Gill, Michael
Van Malderen, Roeland
Delcloo, Andy W.
Sussmann, Ralf
Mahieu, Emmanuel
Servais, Christian
Romanens, Gonzague
Stübi, Rene
Ancellet, Gerard
Godin‐Beekmann, Sophie
Yamanouchi, Shoma
Strong, Kimberly
Johnson, Bryan
Cullis, Patrick
Petropavlovskikh, Irina
Hannigan, James W.
Hernandez, Jose‐Luis
Diaz Rodriguez, Ana
Nakano, Tatsumi
Chouza, Fernando
Leblanc, Thierry
Torres, Carlos
Garcia, Omaira
Röhling, Amelie N.
Schneider, Matthias
Blumenstock, Thomas
Tully, Matt
Paton‐Walsh, Clare
Jones, Nicholas
Querel, Richard
Strahan, Susan
Stauffer, Ryan M.
Thompson, Anne M.
Inness, Antje
Engelen, Richard
Chang, Kai‐Lan
Cooper, Owen R.
Publisher UCAR/NCAR - Library
Publication Date 2021-03-16T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2023-08-18T18:07:28.393591
Metadata Record Identifier edu.ucar.opensky::articles:24074
Metadata Language eng; USA
Suggested Citation Steinbrecht, Wolfgang, Kubistin, Dagmar, Plass‐Dülmer, Christian, Davies, Jonathan, Tarasick, David W., Gathen, Peter von der, Deckelmann, Holger, Jepsen, Nis, Kivi, Rigel, Lyall, Norrie, Palm, Matthias, Notholt, Justus, Kois, Bogumil, Oelsner, Peter, Allaart, Marc, Piters, Ankie, Gill, Michael, Van Malderen, Roeland, Delcloo, Andy W., Sussmann, Ralf, Mahieu, Emmanuel, Servais, Christian, Romanens, Gonzague, Stübi, Rene, Ancellet, Gerard, Godin‐Beekmann, Sophie, Yamanouchi, Shoma, Strong, Kimberly, Johnson, Bryan, Cullis, Patrick, Petropavlovskikh, Irina, Hannigan, James W., Hernandez, Jose‐Luis, Diaz Rodriguez, Ana, Nakano, Tatsumi, Chouza, Fernando, Leblanc, Thierry, Torres, Carlos, Garcia, Omaira, Röhling, Amelie N., Schneider, Matthias, Blumenstock, Thomas, Tully, Matt, Paton‐Walsh, Clare, Jones, Nicholas, Querel, Richard, Strahan, Susan, Stauffer, Ryan M., Thompson, Anne M., Inness, Antje, Engelen, Richard, Chang, Kai‐Lan, Cooper, Owen R.. (2021). COVID‐19 crisis reduces free tropospheric ozone across the Northern Hemisphere. UCAR/NCAR - Library. Accessed 26 September 2023.

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