Greifswald 2024 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 5: Cryosphere and Arctic Oceans
UP 5.4: Vortrag
Mittwoch, 28. Februar 2024, 12:00–12:15, ELP 6: HS 4
Bromine explosions and catalytic ozone depletion in the Arctic spring-time boundary layer — •Stefanie Falk1,2, Luca Reißig1, Andreas Richter3, Hans-Werner Jacobi4, and Björn-Martin Sinnhuber1 — 1Karlsruher Institut für Technologie — 2Ludwig-Maximilians-Universität München — 3Institut für Umweltphysik, Universität Bremen — 4Institute of Environmental Geosciences (IGE), Université Grenoble Alpes / CNRS / Grenoble INP / INRAE / IRD
Ozone depletion in the polar boundary layer is observed frequently during springtime and is related to an enhancement of reactive bromine. Consequently, increased amounts of volume mixing ratio and vertical column densities of BrO have been observed by in situ observation, ground-based and airborne remote sensing, and satellites. Such activated reactive bromine serves as a source of tropospheric BrO at high latitudes, which otherwise is underestimated in global models. We have implemented a treatment of reactive bromine deposition, release, and recycling on sea ice and snow-covered terrestrial surfaces in the global chemistry-climate model ECHAM/MESSy Atmospheric Chemistry (EMAC).
Within the BromoPole project, we will compare EMAC model predictions with bromide concentrations determined in snow samples taken at Spitsbergen (Ny-Ålesund) and BrO observations from satellite (e.g. TROPOMI) and improve the modeled AirSnow mechanism in EMAC. Possible applications in ICON will be explored.
Keywords: Ozone; Bromine explosions; Arctic boundary layer; Atmospheric chemistry; Snow sampling