Stratospheric N2O5, CH4, and N2O Profiles from IR Solar Occultation Spectra

Details Stratospheric N2O5, CH4, and N2O Profiles from IR Solar Occultation Spectra Stratospheric N2O5, CH4, and N2O Profiles from IR Solar Occultation Spectra

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatc...16...31p&link_type=abstract

Journal of Atmospheric Chemistry, vol. 16, p. 31

Computer Science

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Nitrogen Oxides, Atmospheric Composition, Methane, Mixing Ratios, Photochemical Reactions, Infrared Spectra, Sunrise, Subjects, Stratosphere, Occultation, Middle Atmosphere, Interpolation, Fourier Transformation, Balloon Sounding, Balloon Flight

Scientific paper

Stratospheric volume mixing ratio profiles of N2O5, CH4, and N2O have been retrieved from a set of 0.052/ cm resolution (FWHM) solar occultation spectra recorded at sunrise during a balloon flight from Aire sur I'Adour, France (44 deg N latitude) on 12 October 1990. The N2O5 results have been derived from measurements of the integrated absorption by the 1246/ cm band. Assuming a total intensity of 4.32 x 1017cm-1 molecule sq cm-2 independent of temperature, the retrieved N2O5 volume mixing ratios in ppbv (parts per billion by volume, 10-9), interpolated to 2 km height spacings, are 1.64 +/- 0.49 at 37.5 km, 1.92 +/- 0.56 at 35.5 km, 2.06 +/- 0.47 at 33.5 km, 1.95 +/- 0.42 at 31.5 km, 1.60 +/- 0.33 at 29.5 km, 1.26 +/- 0.28 at 27.5 km, and 0.85 +/- 0.20 at 25.5 km. Error bars indicate the estimated I-sigma uncertainty including the error in the total band intensity (+/- 20% has been assumed). The retrieved profiles are compared with previous measurements and photochemical model results.

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