Validation of Aura MLS HOx measurements with remote-sensing balloon instruments

Physics

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Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques, Atmospheric Composition And Structure: General Or Miscellaneous

Scientific paper

Satellite measurements of OH and HO2 obtained by the Aura MLS instrument are compared to the balloon-borne BOH and FIRS-2 instruments. All measurements are also compared with constrained photochemical model calculations. On average, both balloon measurements of OH agree with MLS within 17% over 25-40 km and the measurements agree with the model within 12%. The three measurements for column of OH above 40 km agree within 8% and the mean is 12% below the model. Measurements of HO2 from FIRS-2 and MLS agree on average within 23% over 25-40 km and the differences are generally within the experimental precision. The HO2 measurements agree with the model within 14%. Measurements of HO2 for the column over 40-60 km agree within 16% and the mean measured column agrees with the model within the experimental precision. Our observations do not appear to indicate a ``HOx dilemma.''

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