Articles | Volume 22, issue 9
https://doi.org/10.5194/acp-22-6151-2022
https://doi.org/10.5194/acp-22-6151-2022
Research article
 | 
11 May 2022
Research article |  | 11 May 2022

Tropospheric ozone production and chemical regime analysis during the COVID-19 lockdown over Europe

Clara M. Nussbaumer, Andrea Pozzer, Ivan Tadic, Lenard Röder, Florian Obersteiner, Hartwig Harder, Jos Lelieveld, and Horst Fischer

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Cited articles

Balamurugan, V., Chen, J., Qu, Z., Bi, X., Gensheimer, J., Shekhar, A., Bhattacharjee, S., and Keutsch, F. N.: Tropospheric NO2 and O3 response to COVID-19 lockdown restrictions at the national and urban scales in Germany, J. Geophys. Res.-Atmos., 126, 1–15, https://doi.org/10.1029/2021JD035440, 2021. a
Bouarar, I., Gaubert, B., Brasseur, G. P., Steinbrecht, W., Doumbia, T., Tilmes, S., Liu, Y., Stavrakou, T., Deroubaix, A., Darras, S., Granier, C., Lacey, F., Müller, J.-F., Shi, X., Elguindi, N., and Wang, T.: Ozone Anomalies in the Free Troposphere During the COVID-19 Pandemic, Geophys. Res. Lett., 48, e2021GL094204, https://doi.org/10.1029/2021GL094204, 2021. a, b, c
Bozem, H., Butler, T. M., Lawrence, M. G., Harder, H., Martinez, M., Kubistin, D., Lelieveld, J., and Fischer, H.: Chemical processes related to net ozone tendencies in the free troposphere, Atmos. Chem. Phys., 17, 10565–10582, https://doi.org/10.5194/acp-17-10565-2017, 2017a. a, b, c
Bozem, H., Pozzer, A., Harder, H., Martinez, M., Williams, J., Lelieveld, J., and Fischer, H.: The influence of deep convection on HCHO and H2O2 in the upper troposphere over Europe, Atmos. Chem. Phys., 17, 11835–11848, https://doi.org/10.5194/acp-17-11835-2017, 2017b. a
Brockmann Lab: Covid-19 Mobility Project, http://covid-19-mobility.org/, last access: 9 March 2022. a
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Short summary
The European COVID-19 lockdowns have significantly reduced the emission of primary pollutants such as NOx, which impacts the tropospheric photochemical processes and the abundance of O3. In this study, we present how the lockdowns have affected tropospheric trace gases and ozone production based on in situ observations and modeling simulations. We additionally show that the chemical regime shifted from a transition point to a NOx limitation in the upper troposphere.
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