@article{gledocs_11858_8677,
author = {Steinbrecht, Wolfgang and Kubistin, Dagmar and Plass‐Dülmer, Christian and Davies, Jonathan and Tarasick, David W. and Gathen, Peter von der and Deckelmann, Holger and Jepsen, Nis and Kivi, Rigel and Lyall, Norrie and Palm, Matthias and Notholt, Justus and Kois, Bogumil and Oelsner, Peter and Allaart, Marc and Piters, Ankie and Gill, Michael and Van Malderen, Roeland and Delcloo, Andy W. and Sussmann, Ralf and Mahieu, Emmanuel and Servais, Christian and Romanens, Gonzague and Stübi, Rene and Ancellet, Gerard and Godin‐Beekmann, Sophie and Yamanouchi, Shoma and Strong, Kimberly and Johnson, Bryan and Cullis, Patrick and Petropavlovskikh, Irina and Hannigan, James W. and Hernandez, Jose‐Luis and Diaz Rodriguez, Ana and Nakano, Tatsumi and Chouza, Fernando and Leblanc, Thierry and Torres, Carlos and Garcia, Omaira and Röhling, Amelie N. and Schneider, Matthias and Blumenstock, Thomas and Tully, Matt and Paton‐Walsh, Clare and Jones, Nicholas and Querel, Richard and Strahan, Susan and Stauffer, Ryan M. and Thompson, Anne M. and Inness, Antje and Engelen, Richard and Chang, Kai‐Lan and Cooper, Owen R.},
title = {COVID‐19 Crisis Reduces Free Tropospheric Ozone Across the Northern Hemisphere},
year = {2021-02-26},
volume = {48},
number = {5},

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 2000–2020 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.},
note = { \url {http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8677}},
}