Hydroxyl Radicals and Oxidation Capacity in the Tropical Troposphere: 
Measurements from CAFE Field Campaigns using HORUS

Holzbeck, Philip; Rohloff, Roland; Sreekumar, Sreedev; Monteiro, Carolina; Tsokankunku, Anywhere; Marno, Daniel; Martinez, Monica; Nussbaumer, Clara; Dienhart, Dirk; Tripathi, Nidhi; Wang, Nijing; Edtbauer, Achim; Bohn, Birger; Obersteiner, Florian; Williams, Jonathan; Fischer, Horst; Curtius, Joachim; Pöhlker, Mira; Lelieveld, Jos; Harder, Hartwig

doi:10.5194/egusphere-egu24-14641

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Meeting Abstract

Hydroxyl Radicals and Oxidation Capacity in the Tropical Troposphere: Measurements from CAFE Field Campaigns using HORUS

MPG-Autoren

/persons/resource/persons289880

Holzbeck, Philip
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/persons289878

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

/persons/resource/persons297280

Monteiro, Carolina
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/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/persons239557

Dienhart, Dirk
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons297519

Tripathi, Nidhi
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons239555

Wang, Nijing
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons207353

Edtbauer, Achim
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101364

Williams, Jonathan
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/persons203102

Pöhlker, Mira
Multiphase 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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Zitation

Holzbeck, P., Rohloff, R., Sreekumar, S., Monteiro, C., Tsokankunku, A., Marno, D., et al. (2024). Hydroxyl Radicals and Oxidation Capacity in the Tropical Troposphere: Measurements from CAFE Field Campaigns using HORUS. In EGU General Assembly 2024, Vienna, Austria & Online. doi:10.5194/egusphere-egu24-14641.

Zitierlink: https://hdl.handle.net/21.11116/0000-000F-D735-3

Zusammenfassung

In EGU General Assembly 2024, Vienna, Austria & Online

In the tropics, intense solar radiation drives photochemistry and strong convection, transporting air from the boundary layer to the upper troposphere. Conditions in the tropics are characterized by high humidity and UV intensity enhancing hydroxyl (OH) radical production. In addition, OH radicals and ozone (O3) are formed through reactions of HOx (OH + HO2) with nitrogen oxides (NOx), the latter being produced by lightning in abundant convective systems. The convection also transports volatile organic compounds (VOCs), notably from emissions by the tropical rainforest. The VOCs are oxidized by radicals and O3, resulting in secondary species contributing to new particle formation. To understand and characterize the atmospheric chemistry in these conditions, the Chemistry of the Atmosphere Field Experiment (CAFE) Brazil was conducted from December 2022 to January 2023 with the High Altitude and Long Range Research Aircraft (HALO) in the Amazon region.

In this study, we present preliminary results measured with the Hydroxyl Radical measurement Unit based on fluorescence Spectroscopy (HORUS), focusing on vertical HOx profiles measured during different times of the day over both the continent and the ocean, including the outflow of both electrified and non-electrified convective systems. In contrast to the conditions over the continents where lightning-generated NOx aids in the efficient recycling of radicals, over the ocean, the limited availability of NO hinders recycling and results in radical termination. The conditions over the continent are compared to those measured over the Atlantic Ocean during the CAFE Africa expedition in summer 2018 based in the Cape-Verde islands. This unique dataset provides valuable insights into the atmospheric chemistry and oxidation capacity in these tropical regions.