EGU General Assembly 2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Impact of reduced aircraft emission on HOx Chemistry in the upper troposphere during BLUESKY Campaign 2020.

Sreedev Sreekumar1,2, Anywhere Tsokankunku1, Daniel Marno1, Roland Rohloff1, Monica Martinez1, Ivan Tadic1, Zaneta Hamryszczak1, Andrea Pozzer1, Joachim Curtius3, Horst Fischer1, Birger Bohn4, Florian Obersteiner5, Jos Lelieveld1, and Hartwig Harder1
Sreedev Sreekumar et al.
  • 1Max Planck Institute For Chemistry , Atmospheric Chemistry, Germany (
  • 2Heidelberg University, Institute of Environmental Physics, Heidelberg, Germany
  • 3University of Frankfurt, Frankfurt am Main, Germany
  • 4Forschungszentrum Jülich, Jülich, Germany
  • 5Karlsruhe Insitute of Technology, Karlsruhe, Germany

Hydroxyl radicals are the most predominant daytime initiator for atmospheric oxidation processes. Due to the COVID -19 pandemic, there was a considerable reduction in emissions from industry and all means of transportation during spring 2020. The main objective of the BLUESKY campaign is to understand the effect of these reduced emissions on atmospheric composition such as trace gases, aerosols, and cloud properties. OH and HO2 were measured with HORUS (HydrOxyl Radical measurement Unit based on fluorescence Spectroscopy), during eight research flights from the boundary layer up to 14 km.  Here we present the impact of reduced aircraft emissions and the meteorological situation on the HOx Chemistry in the upper troposphere over Europe during the COVID-19 lockdown. We contrast the findings during BLUESKY with results from previous campaigns and analyze the occurrence of HOx during daytime in the outflow of electrified and non-electrified convective systems.

How to cite: Sreekumar, S., Tsokankunku, A., Marno, D., Rohloff, R., Martinez, M., Tadic, I., Hamryszczak, Z., Pozzer, A., Curtius, J., Fischer, H., Bohn, B., Obersteiner, F., Lelieveld, J., and Harder, H.: Impact of reduced aircraft emission on HOx Chemistry in the upper troposphere during BLUESKY Campaign 2020., EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-4532,, 2023.

Supplementary materials

Supplementary material file