EGU22-9685, updated on 10 Jan 2023
EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Organic, inorganic and total bromine measurements 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, and Klaus Pfeilsticker1
Meike Rotermund et al.
  • 1Institute of Environmental Physics, Ruprecht-Karls-Universität Heidelberg, 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

We report on measurements of organic, inorganic and total bromine (Brtot) in the upper troposphere and lower stratosphere (UTLS) over southern Argentina and surroundings extending down to the Antarctic Peninsula in September and November of 2019. These measurements 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. Brtot is inferred from measured total organic bromine (Brorg), i.e., the sum of bromine contained in CH3Br, the halons and the major very short-lived brominated species, added to inorganic bromine (Bryinorg), evaluated from measured BrO and photochemical modelling. Lagrangian transport modelling as well as in situ measured transport (CO and N­­2O) and air mass lag-time (SF6) tracers are used to identify air mass transport pathways into the UTLS and indicate the likely origins of bromine-rich air masses reaching the Southern Hemisphere (SH) lower stratosphere. Additionally, the SH bromine volume mixing ratios are compared with previous measurements from fall 2017 observed in the Northern Hemisphere as part of the Wave-driven ISentropic Exchange (WISE) research campaign, and 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., and Pfeilsticker, K.: Organic, inorganic and total bromine measurements around the extratropical tropopause and lowermost stratosphere, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-9685,, 2022.


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