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

Organic, inorganic and total bromine observations around the extratropical tropopause and lowermost stratosphere

Meike Rotermund1, Andreas Engel2, Jens-Uwe Grooß3, Peter Hoor4, Markus Jesswein2, Flora Kluge1, Tanja Schuck2, Bärbel Vogel3, Thomas Wagenhäuser2, Benjamin Weyland1, Andreas Zahn5, Siyuan Zheng3, and Klaus Pleilsticker1
Meike Rotermund et al.
  • 1Ruprecht-Karls-Universität Heidelberg, Institute of Environmental Physics, Department of Physics and Astronomy, Heidelberg, Germany (
  • 2Institute for Atmospheric and Environmental Science, Goethe University Frankfurt, Frankfurt, Germany
  • 3Institute of Energy and Climate Research - Stratosphere (IEK-7), Forschungszentrum Jülich, Jülich, Germany
  • 4Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
  • 5Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Organic, inorganic and total bromine (Brtot) around the upper troposphere and lower stratosphere (UTLS) were measured over southern Argentina and the surrounding regions extending down to the Antarctic Peninsula in September and November of 2019. These observations were recorded from the German High Altitude and LOng range research aircraft (HALO) as part of the Transport and Composition of the Southern Hemisphere UTLS (SouthTRAC) research campaign. Total bromine (Brtot) is inferred from measured total organic bromine (Brorg) added to inorganic bromine (Bryinorg). Brorg is comprised of the bromine summed from CH3Br, the halons, and the major very short-lived brominated species measured onboard HALO by the University of Frankfurt, while the Bryinorg is evaluated from limb measured BrO and CLaMS photochemical transport modelling (FZ Jülich) accounting for the BrO/Bryinorg ratio. Air mass transport pathways into the UTLS and the likely origins of bromine-rich air masses reaching the Southern Hemisphere (SH) lower stratosphere are identified through distributions of in situ measured transport (CO and N­­2O) and air mass lag-time (SF6) tracers as well as Lagrangian transport modelling. Additionally, Brtot measured in the SH is compared with previous measurements observed in the Northern Hemisphere as part of the Wave-driven ISentropic Exchange (WISE) research campaign in fall 2017, as well as the long term trend in stratospheric bromine.

How to cite: Rotermund, M., Engel, A., Grooß, J.-U., Hoor, P., Jesswein, M., Kluge, F., Schuck, T., Vogel, B., Wagenhäuser, T., Weyland, B., Zahn, A., Zheng, S., and Pleilsticker, K.: Organic, inorganic and total bromine observations around the extratropical tropopause and lowermost stratosphere, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-9161,, 2023.

Supplementary materials

Supplementary material file