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Deprecated: Implicit conversion from float 229.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Geophys+Res+Lett 2021 ; 48 (5): e2020GL091987 Nephropedia Template TP
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COVID-19 Crisis Reduces Free Tropospheric Ozone Across the Northern Hemisphere #MMPMID33785974
Steinbrecht W; Kubistin D; Plass-Dulmer C; Davies J; Tarasick DW; von der Gathen P; Deckelmann H; Jepsen N; Kivi R; Lyall N; Palm M; Notholt J; Kois B; Oelsner P; Allaart M; Piters A; Gill M; Van Malderen R; Delcloo AW; Sussmann R; Mahieu E; Servais C; Romanens G; Stubi R; Ancellet G; Godin-Beekmann S; Yamanouchi S; Strong K; Johnson B; Cullis P; Petropavlovskikh I; Hannigan JW; Hernandez JL; Diaz Rodriguez A; Nakano T; Chouza F; Leblanc T; Torres C; Garcia O; Rohling AN; Schneider M; Blumenstock T; Tully M; Paton-Walsh C; Jones N; Querel R; Strahan S; Stauffer RM; Thompson AM; Inness A; Engelen R; Chang KL; Cooper OR
Geophys Res Lett 2021[Mar]; 48 (5): e2020GL091987 PMID33785974show ga
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% ( approximately 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.