Carbonate precipitation in brine ? the trigger for tropospheric ozone depletion events

• Main Authors: Sander, R., Burrows, J., Kaleschke, L.
• Other Authors: Atmospheric Chemistry Department MPIC, Max Planck Institute for Chemistry (MPIC), Max-Planck-Gesellschaft-Max-Planck-Gesellschaft, Institute of Environmental Physics and Remote Sensing Bremen (IUP/IFE), University of Bremen
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2006
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Sea ice
• Online Access: https://hal.science/hal-00302027; https://hal.science/hal-00302027/document; https://hal.science/hal-00302027/file/acpd-6-7075-2006.pdf

International audience Tropospheric ozone depletion events (ODEs) at high latitudes were discovered 20 years ago and are attributed to bromine explosions. However, an outstanding and unresolved issue is the explanation of how the acid-catalyzed reaction cycle is triggered in atmospheric particles derived from alkaline sea water. By simulating the chemistry occuring in polar regions over recently formed sea ice, we can model successfully the transformation of inert sea-salt bromide to reactive bromine monoxide (BrO) and the subsequent ODE when precipitation of calcium carbonate from freezing sea water is taken into account. In addition, we found the temperature dependence of the equilibrium BrCl+Br?Br 2 Cl ? to be important.