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The vertical distribution of ClO at Ny‐Ålesund during March 1997
Author(s) -
Ruhnke R.,
Kouker W.,
Reddmann Th.,
Berg H.,
Hochschild G.,
Kopp G.,
Krupa R.,
Kuntz M.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900127
Subject(s) - mixing ratio , stratosphere , ozone , radiometer , polar vortex , atmosphere (unit) , absorption (acoustics) , atmospheric sciences , chemistry , analytical chemistry (journal) , meteorology , geology , physics , optics , environmental chemistry
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 HO 2 + ClO reaction branching ratio and of the absorption cross section of Cl 2 O 2 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 HO 2 + ClO reaction reduces the upper stratospheric ClO mixing ratio by 22%. Different absorption spectra of Cl 2 O 2 alter the ClO mixing ratios up to 12% at noon at 20 km. This causes differences of 15% in the ozone loss during winter.