Stratospheric observations of NO3 and its experimental and theoretical distribution between 20 and 40 km |
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| Authors: | JP Naudet D Huguenin P Rigaud D Cariolle |
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| Institution: | 1. Observatoire de Genève CH-1290 Sauverny, France;2. Station Scientifique du Val Joyeux P-78450 Villepreux, France;3. Etablissement d''Etudes et de Recherches Météorologiques 77 rue de Sévres, F-92106 Boulogne, France |
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| Abstract: | A simultaneous night-time observation of NO3 and 03 has been made by means of a balloon-borne spectrophotometer pointing at the rising planet Venus. The spectrum recorded between 642 and 672 nm makes it possible to determine the NO3 and O3 absorptions in the 662 nm band and the Chappuis bands, respectively. The NO3 vertical distribution is deduced, and is found to reach a peak of (3.4 ± 0.4) 107 molecules cm?3at 35 km. Such an observational result can be interpreted in terms of a theoretical profile deduced from a one-dimension time-dependant photochemical model which takes account of the night-time stratospheric NO2, NO3 and N2O5 constituents and the latest kinetic and photochemical data for the rate constants. |
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