Sensitivity of ozone to bromine in the lower stratosphere

The core information for this publication's citation.: 
Salawitch, R., D. Weisenstein, L. J. Kovalenko, C. E. Sioris, P. Wennberg, K. Chance, M. Ko, and C. A. McLinden (2005), Sensitivity of ozone to bromine in the lower stratosphere, Geophys. Res. Lett., 32, L05811, doi:10.1029/2004GL021504.

Measurements of BrO suggest that inorganic bromine (Bry) at and above the tropopause is 4 to 8 ppt greater than assumed in models used in past ozone trend assessment studies. This additional bromine is likely carried to the stratosphere by short-lived biogenic compounds and their decomposition products, including tropospheric BrO. Including this additional bromine in an ozone trend simulation increases the computed ozone depletion over the past ~25 years, leading to better agreement between measured and modeled ozone trends. This additional Bry (assumed constant over time) causes more ozone depletion because associated BrO provides a reaction partner for ClO, which increases due to anthropogenic sources. Enhanced Bry causes photochemical loss of ozone below ~14 km to change from being controlled by HOx catalytic cycles (primarily HO2+O3) to a situation where loss by the BrO+HO2 cycle is also important.

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