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Numerical simulation of the impact of COVID-19 lockdown on tropospheric composition and aerosol radiative forcing in Europe

Reifenberg, Simon F.; Martin, Anna; Kohl, Matthias; Bacer, Sara; Hamryszczak, Zaneta; Tadic, Ivan; Röder, Lenard; Crowley, Daniel J.; Fischer, Horst; Kaiser, Katharina; Schneider, Johannes; Dörich, Raphael; Crowley, John N.; Tomsche, Laura; Marsing, Andreas; Voigt, Christiane; Zahn, Andreas 1; Pöhlker, Christopher; Holanda, Bruna A.; ... mehr

Abstract:

Aerosols influence the Earth's energy balance directly by modifying the radiation transfer and indirectly by altering the cloud microphysics. Anthropogenic aerosol emissions dropped considerably when the global COVID-19 pandemic resulted in severe restraints on mobility, production, and public life in spring 2020. We assess the effects of these reduced emissions on direct and indirect aerosol radiative forcing over Europe, excluding contributions from contrails. We simulate the atmospheric composition with the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model in a baseline (business-as-usual) and a reduced emission scenario. The model results are compared to aircraft observations from the BLUESKY aircraft campaign performed in May–June 2020 over Europe. The model agrees well with most of the observations, except for sulfur dioxide, particulate sulfate, and nitrate in the upper troposphere, likely due to a biased representation of stratospheric aerosol chemistry and missing information about volcanic eruptions. The comparison with a baseline scenario shows that the largest relative differences for tracers and aerosols are found in the upper troposphere, around the aircraft cruise altitude, due to the reduced aircraft emissions, while the largest absolute changes are present at the surface. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000150614
Veröffentlicht am 13.09.2022
Originalveröffentlichung
DOI: 10.5194/acp-22-10901-2022
Scopus
Zitationen: 12
Web of Science
Zitationen: 9
Dimensions
Zitationen: 20
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 26.08.2022
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000150614
HGF-Programm 12.11.13 (POF IV, LK 01) Long-term trends of global atmospheric composition
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 22
Heft 16
Seiten 10901–10917
Nachgewiesen in Scopus
Web of Science
Dimensions
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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