Stratospheric observations of NO3 and its experimental and theoretical distribution between 20 and 40 km

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Atmospheric Chemistry, Balloon Sounding, Nitrogen Oxides, Ozone, Stratosphere, Night Sky, Photodissociation, Radiation Effects, Reaction Kinetics, Solar Radiation, Vertical Distribution

Scientific paper

A simultaneous nighttime observation of NO3 and O3 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 Chappius bands, respectively. The NO3 vertical distribution is deduced, and is found to reach a peak of (3.4 plus or minus 0.4) 10 to the 7th molecules per cu cm at 35 km. Such an observational result can be interpreted in terms of a theoretical profile deduced from a one-dimensional time-dependant photochemical model which takes account of the nighttime stratospheric NO2, NO3 and N2O5 constituents and the latest kinetic and photochemical data for the rate constants.

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