Stratospheric N2O5, CH4, and N2O profiles from IR solar occultation spectra

University of Denver, Denver, Colorado, United States
Journal of Atmospheric Chemistry (Impact Factor: 1.95). 12/1992; 16(1):31-40. DOI: 10.1007/BF00696622


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 4.3210–17 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 1.640.49 at 37.5 km, 1.920.56 at 35.5 km, 2.060.47 at 33.5 km, 1.950.42 at 31.5 km, 1.600.33 at 29.5 km, 1.260.28 at 27.5 km, and 0.850.20 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.

10 Reads
  • Source
    • "The two UV/vis spectrometers analyze the direct sunlight at almost all wavelengths ranging from the UV (320 nm) into the red spectral range (670 nm) for the atmospheric absorption of O 3 , NO 2 , OClO, O 4 , BrO, IO, OIO, and H 2 O[Ferlemann et al., 2000]. The IR-FT instrument simultaneously measured O 3 , NO, NO 2 , HNO 3 , HCl, ClONO 2 , N 2 O, CH 4 , and some other gases[Camy-Peyret et al., 1993;Payan et al., 1999]. For more scientific results using the UV/visible spectrometers, see Bösch et al.[2001], Ferlemann et al.[1998], Harder et al.[1998,2000], Fitzenberger et al.[2000], Pfeilsticker et al.[2000,2001], and Lumpe et al.[2002].[13]The "

    Full-text · Article · Jan 2005
  • Source
    • "The LPMA/DOAS gondola carried two optical spectrometers that analyse direct sunlight over virtually the entire wavelength band from the UV into the mid-IR. This instrumental set-up allowed us to study stratospheric concentrations of a suite of atmospheric constituents [e.g., Camy-Peyret et al., 1993; Ferlemann et al., 1998, 2000]. Here, we use the N20 measurements made in the IR range /Payan et a/.,1998], and BrO measured in the UV [Harder et al., 1998, 2000; Fitzenberger et al., 2000] "
    [Show abstract] [Hide abstract]
    ABSTRACT: In the Arctic winter 1998/99, two balloon payloads were launched in a co-ordinated study of stratospheric bromine. Vertical profiles (9-28 km) of all known major organic Br species (CH3Br, C2H5Br, CH2BrCl, CHBrCl2, CH2Br2, CHBr2Cl, CHBr3, H1301, H1211, H2402, and H1202) were measured, and total organic Br (henceforth called Bryorg) originating from these organic precursors was inferred as a function of altitude. This was compared with total inorganic reactive Br (henceforth called Bryin) derived from spectroscopic BrO observations, after accounting for modeled stratospheric Bry partitioning. Within the studied altitude range the two profiles differed by less than the estimated accumulated uncertainties. This good agreement suggests that the lower stratospheric budget and chemistry of Br is well understood for the specified conditions. For early 1999 our data suggest a Bryin mixing ratio of 1.5 ppt in air just above the local Arctic tropopause (~9.5 km), whilst at 25 km in air of 5.6 yr mean age it was estimated to be 18.4(+1.8/-1.5)ppt from organic precursor measurements, and (21.5+/-3.0)ppt from BrO measurements and photochemical modelling, respectively. This suggests a Bryin influx of 3.1(-2.9/+3.5)ppt from the troposphere to the stratosphere.
    Full-text · Article · Oct 2000 · Geophysical Research Letters
  • [Show abstract] [Hide abstract]
    ABSTRACT: MIPAS (Michelson Interferometer for Passive Atmospheric Sounding), a high resolution limb sounder, is now under construction as an ESA Developed Instrument (EDI) on ESA's planned environmental satellite ENVISAT-1. The feasibility of detecting 27 trace constituents with MIPAS in the middle atmosphere has been studied under a contract with ESA on the basis of simulated limb emission spectra in the mid-i.r. spectral region from 4.15 to 14.6 μm assuming a spectral resolution of 0.05 cm-1. Synthetic emission spectra have been generated for complete limb sequences. For the best suited spectral features, radiance profiles have been calculated for various atmospheric conditions. Based on the present performance parameters of MIPAS, altitude ranges have been estimated in which each constituent can be measured within defined limits of accuracy. The working procedure and the main results of the study on MIPAS' capability to measure the atmospheric composition are presented. While the results are specific to this instrument, they might be of general interest to investigators working in the area of high resolution atmospheric remote sensing.
    No preview · Article · Sep 1994 · Journal of Quantitative Spectroscopy and Radiative Transfer
Show more