EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Inorganic and organic bromine measurements around the extra-tropical tropopause: Insights into total stratospheric bromine

Meike Rotermund1, Ben Schreiner1, Flora Kluge1, Tilman Hüneke1, Andreas Engel2, Tanja Schuck2, Timo Kerber2, Jens-Uwe Grooß3, Andreas Zahn4, and Klaus Pfeilsticker1
Meike Rotermund et al.
  • 1Institute of Environmental Physics, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
  • 2Institute for Atmospheric and Environmental Sciences, Goethe University Frankfurt, Germany
  • 3IEK-7, Forschungszentrum Jülich GmbH, Jülich, Germany
  • 4IMK-ASF, Karlsruhe Institute of Technology, Karlsruhe, Germany

Bromine greatly influences the UT/LS ozone concentrations, however the transport of bromine across the tropical tropopause layer and in particular across the extratropical tropopause is not well quantified. Air-borne measurements of atmospheric trace gases such as organic and inorganic bromine along the tropopause are studied during the WISE (Wave-driven ISentropic Exchange) research campaign over the northern Atlantic and western Europe from September 13 - October 21, 2017. The remote sensing instrument mini-DOAS (Differential Optical Absorption Spectroscopy) is mounted on the HALO (High Altitude and LOng range) aircraft and measures BrO (O3, NO2 among other trace gases). The novel scaling method is applied to infer the target gas BrO mixing ratios from slant column densities using in-situ O3 measurements from the FAIRO instrument (operated by KIT) as the scaling gas. For each flight, the inferred mixing ratios are directly compared with CLaMS (Chemical Lagrangian Model of the Stratosphere) simulated curtains of the trace gases along the flight path. The partitioning coefficient of inorganic bromine from CLaMS and all relevant organic halogen species and air mass ages (SF6, CO2) from the GhOST-MS instrument (operated by UFra) are used to determine the total bromine budget along the UT/LS. A climatology of organic, inorganic and total bromine is constructed with respect to the extratropical tropopause as well as the air mass ages. This indicates the interplay of bromine transport across the extratropical tropopause and of the transport of air via the lower branch from the tropics as well as potential losses of inorganic bromine by uptake onto and sedimentation of ice particles.

How to cite: Rotermund, M., Schreiner, B., Kluge, F., Hüneke, T., Engel, A., Schuck, T., Kerber, T., Grooß, J.-U., Zahn, A., and Pfeilsticker, K.: Inorganic and organic bromine measurements around the extra-tropical tropopause: Insights into total stratospheric bromine, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-7507,, 2020

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