Stratospheric N2O5, CH4, and N2O profiles from IR solar occultation spectra |
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| Authors: | C Camy-Peyret J -M Flaud A Perrin C P Rinsland A Goldman F J Murcray |
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| Institution: | (1) Laboratoire de Physique Moléculaire et Applications, CNRS Université Pierre and Marie Curie, Paris, France;(2) Atmospheric Sciences Division, NASA Langley Research Center, Hampton, Virginia, USA;(3) Department of Physics, University of Denver, Denver, Colorado, USA |
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| Abstract: | Stratospheric volume mixing ratio profiles of N2O5, CH4, and N2O have been retrieved from a set of 0.052 cm–1 resolution (FWHM) solar occultation spectra recorded at sunrise during a balloon flight from Aire sur l'Adour, France (44° N latitude) on 12 October 1990. The N2O5 results have been derived from measurements of the integrated absorption by the 1246 cm–1 band. Assuming a total intensity of 4.32×10–17 cm–1/molecule 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 1- 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.Laboratoire associé aux Universités Pierre et Marie Curie et Paris Sud. |
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| Keywords: | Atmospheric composition middle atmosphere stratosphere Fourier transform spectroscopy balloon measurements nitrogen oxydes methane |
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