Carbonate precipitation in brine ? a potential trigger for tropospheric ozone depletion events

International audience Tropospheric ozone depletion events (ODEs) at high latitudes were discovered 20 years ago and are attributed to bromine explosions. However, an unresolved issue is the explanation of how the acid-catalyzed reaction cycle is triggered in atmospheric particles derived from alkal...

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Bibliographic Details
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-00296054
https://hal.science/hal-00296054/document
https://hal.science/hal-00296054/file/acp-6-4653-2006.pdf
Description
Summary:International audience Tropospheric ozone depletion events (ODEs) at high latitudes were discovered 20 years ago and are attributed to bromine explosions. However, an 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.

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