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

Ozone production and chemical regime analysis in the upper tropical troposphere

Clara M. Nussbaumer1, Andrea Pozzer1, Jos Lelieveld1,2, and Horst Fischer1
Clara M. Nussbaumer et al.
  • 1Max Planck Institute for Chemistry, Mainz, Germany (
  • 2Climate and Atmosphere Research Center, The Cyprus Institute, Nicosia, Cyprus

Ozone is a greenhouse gas and, after water, the second most relevant contributor to global warming in the upper troposphere. Therefore, understanding and monitoring the processes contributing to ozone production is an important tool in observing the progression of climate change. The two main tropospheric precursors to ozone formation are nitrogen oxides (NOx = NO + NO2) and volatile organic compounds (VOC). Depending on their availability, ozone production can be limited by either of its precursors. In our study, we focus on processes contributing to ozone formation and loss in the upper tropical troposphere, where changes in ozone have one of the largest impacts on the radiative forcing. Based on modeled trace gas concentrations and meteorological parameters by the EMAC atmospheric chemistry - general circulation model, we analyze a variety of metrics including net ozone production rates (NOPR), the formaldehyde (HCHO) to NO2 ratio and the share of methyl peroxyradicals (CH3O2) forming HCHO (αCH3O2) in their ability to indicate the dominating ozone regime in the upper troposphere between 30°N and 30°S latitude.

How to cite: Nussbaumer, C. M., Pozzer, A., Lelieveld, J., and Fischer, H.: Ozone production and chemical regime analysis in the upper tropical troposphere, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-905,, 2023.