Stratospheric N2O5 profiles at sunrise and sunset from further analysis of the ATMOS/Spacelab 3 solar spectra

Physics

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Absorption Spectra, Nitrogen Oxides, Solar Eclipses, Solar Spectra, Spacelab, Spectral Bands, Stratosphere, Atmospheric Composition, Evening, Morning, Ozone Depletion

Scientific paper

Data obtained by the Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment during the Spacelab 3 (SL3) mission (April 29 to May 6, 1985) indicated the presence of N2O5 in the stratosphere. This paper presents additional analyses of the ATMOS/SL3 spectra carried out to obtain quantitative information on stratospheric N2O5. Results of this analysis include the detection and measurement of weak N2O5 absorption at sunset in the lower stratosphere, the inversion of a precise (about 10 percent) N2O5 sunrise vertical distribution between 25.5 and 37.5 km altitude, and the identification and measurement of absorption by the N2O5 743/cm band at sunrise. Results confirm model predictions that not all of the N2O5 is photodissociated during the day, except in polar regions during the extended daylight of summer.

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