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    Influence of scintillation on quality of ozone monitoring by GOMOS

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    Authors
    Sofieva, V.F.
    Kan, V.
    Dalaudier, F.
    Kyrölä, E.
    Tamminen, J.
    Bertaux, J.-L.
    Hauchecorne, A.
    Fussen, D.
    Vanhellemont, F.
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    Discipline
    Physical sciences
    Subject
    atmospheric chemistry
    chemical composition
    Envisat-1
    error analysis
    ozone
    photometer
    quantitative analysis
    Audience
    Scientific
    Date
    2009
    Metadata
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    Description
    Stellar light passing through the Earth atmosphere is affected by refractive effects, which should be taken into account in retrievals from stellar occultation measurements. Scintillation caused by air density irregularities is a nuisance for retrievals of atmospheric composition. In this paper, we consider the influence of scintillation on stellar occultation measurements and on the quality of ozone retrievals from these measurements, based on experience of the GOMOS (Global Ozone Monitoring by Occultation of Stars) instrument on board the Envisat satellite. In GOMOS retrievals, the scintillation effect is corrected using scintillation measurements by the fast photometer. We present quantitative estimates of the current scintillation correction quality and of the impact of scintillation on ozone retrievals by GOMOS. The analysis has shown that the present scintillation correction efficiently removes the distortion of transmission spectra caused by scintillations, which are generated by anisotropic irregularities of air density. The impact of errors of dilution and anisotropic scintillation correction on the quality of ozone retrievals is negligible. However, the current scintillation correction is not able to remove the wavelength-dependent distortion of transmission spectra caused by isotropic scintillations, which can be present in off-orbital-plane occultations. This distortion may result in ozone retrieval errors of 0.5-t;1.5% at altitudes 20-40 km. This contribution constitutes a significant percentage of the total error for bright stars. The advanced inversion methods that can minimize the influence of scintillation correction error are also discussed.
    Citation
    Sofieva, V.F.; Kan, V.; Dalaudier, F.; Kyrölä, E.; Tamminen, J.; Bertaux, J.-L.; Hauchecorne, A.; Fussen, D.; Vanhellemont, F. (2009). Influence of scintillation on quality of ozone monitoring by GOMOS. , Atmospheric Chemistry and Physics, Vol. 9, Issue 23, 9197-9207,
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/3260
    scopus: 2-s2.0-71849093774
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
    NewsHelpdeskBELSPO OA Policy

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