Hydroxyl radicals in the Amazon tropical troposphere measured during the 
CAFE-Brazil field campaign with HORUS

Holzbeck, Philip; Sreekumar, Sreedev; Tsokankunku, Anywhere; Marno, Daniel; Rohloff, Roland; Martinez, Monica; Nussbaumer, Clara; Fischer, Horst; Curtius, Joachim; Pöhlker , Mira; Lelieveld, Jos; Harder, Hartwig

doi:10.5194/egusphere-egu23-10355

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Hydroxyl radicals in the Amazon tropical troposphere measured during the CAFE-Brazil field campaign with HORUS

MPS-Authors

/persons/resource/persons289880

Holzbeck, Philip
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons289878

Sreekumar, Sreedev
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons144590

Tsokankunku, Anywhere
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons230380

Marno, Daniel
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons239553

Rohloff, Roland
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101122

Martinez, Monica
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons256981

Nussbaumer, Clara
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons100935

Fischer, Horst
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101104

Lelieveld, Jos
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons100983

Harder, Hartwig
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Holzbeck, P., Sreekumar, S., Tsokankunku, A., Marno, D., Rohloff, R., Martinez, M., et al. (2023). Hydroxyl radicals in the Amazon tropical troposphere measured during the CAFE-Brazil field campaign with HORUS. EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-10355. doi:10.5194/egusphere-egu23-10355.

Cite as: https://hdl.handle.net/21.11116/0000-000D-3982-0

Abstract

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.