The reaction O(3P)+HOBr: Temperature dependence of the rate constant and importance of the reaction as an HOBr stratospheric loss process

Details The reaction O(3P)+HOBr: Temperature dependence of the rate constant and importance of the reaction as an HOBr stratospheric loss process The reaction O(3P)+HOBr: Temperature dependence of the rate constant and importance of the reaction as an HOBr stratospheric loss process

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..827n&link_type=abstract

Geophysical Research Letters, Volume 22, Issue 7, p. 827-830

Physics

4

Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry

Scientific paper

The absolute rate constant for the reaction O(3P)+HOBr has been measured between T=233 K and 423 K using the discharge-flow kinetic technique coupled to mass spectrometric detection. The value of the rate coefficient at room temperature is (2.5+/-0.6)×10-11 cm3 molecule-1 s-1 and the derived Arrhenius expression is (1.4+/-0.5)×10-10 exp[(-430+/-260)/T] cm3 molecule-1 s-1. From these rate data the atmospheric lifetime of HOBr with respect to reaction with O(3P) is about 0.6 h at z=25 km which is comparable to the photolysis lifetime based on recent measurements of the UV cross section for HOBr. Implications for HOBr loss in the stratosphere have been tested using a 1D photochemical box model. With the inclusion of the rate parameters and products for the O+HOBr reaction, calculated concentration profiles of BrO increase by up to 33% around z=35 km. This result indicates that the inclusion of the O+HOBr reaction in global atmospheric chemistry models may have an impact on bromine partitioning in the middle atmosphere.

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