Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..839r&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 7, p. 839-842
Physics
6
Atmospheric Composition And Structure, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry
Scientific paper
Results of the Karlsruhe Simulation Model of the Middle Atmosphere (KASIMA) are compared with vertical ClO profiles measured by the ground-based Millimeter Wave Radiometer MIRA2 inside the vortex during March 1997 at Ny-Ålesund. The influence of the OH+ClO and HO2+ClO reaction branching ratio and of the absorption cross section of Cl2O2 on the calculated mixing ratios of ClO and ozone has been investigated. In the upper stratosphere the ClO mixing ratio is reduced by 90% by using a minor channel of the OH+ClO reaction with a branching ratio of 0.07. A temperature dependent minor channel of the HO2+ClO reaction reduces the upper stratospheric ClO mixing ratio by 22%. Different absorption spectra of Cl2O2 alter the ClO mixing ratios up to 12% at noon at 20 km. This causes differences of 15% in the ozone loss during winter.
Berg Hellmut
Hochschild G.
Köpp Gene
Kouker W.
Krupa R.
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