Dresden 2026 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 8: Poster

UP 8.4: Poster

Mittwoch, 11. März 2026, 15:00–17:00, P1

The role of sea salt aerosols in Arctic bromine explosion events — •Ariane Le Cardinal¹, Stefanie Falk¹, Hugo El-Mansi², Hans-Werner Jacobi², and Björn-Martin Sinnhuber¹ — ¹Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Trace Gases and Remote Sensing, Karlsruhe, Germany — ²Institute of Environmental Geosciences (IGE), Université Grenoble Alpes / CNRS / Grenoble INP / INRAE / IRD, Grenoble, France

Ozone depletion events (ODEs) during Arctic springs are caused by halogen compounds, dominated by bromine (Br). Sea salt aerosols provide an important reservoir of bromide (Br⁻). During bromine explosion events, the reaction of atmospheric HOBr with Br⁻ in the snow or sea ice surface releases molecular bromine Br₂ in the gas phase. Photolysis of Br₂ then rapidly amplifies the amount of reactive Br, causing ozone loss. As polar tropospheric bromine chemistry is currently not included by default in most chemistry climate models, a better understanding of the sea salt distribution in the Arctic snow is needed to better predict ODEs. We compare modelled sea salt emission, transport, and deposition, using ICON-ART at a 13 km resolution (R03B07) with Br₂ released from salty snow. Model results are evaluated using snow samples taken at Spitzbergen (Ny-Ålesund) in 2024, together with satellite observations.

Keywords: sea salt aerosols; bromine explosion; Arctic; ICON-ART; ozone depletion events