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    Autoregressive smoothing of GOMOS transmittances

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    Fussen(2005).pdf (1.292Mb)
    Authors
    Fussen, D.
    Vanhellemont, F.
    Bingen, C.
    Kyrölä, B.
    Tamminen, J.
    Sofieva, V.
    Hassinen, S.
    Seppälä, A.
    Verronen, P.T.
    Bertaux, J.L.
    Hauchecorne, A.
    Dalaudier, F.
    Fanton d'Andon, O.
    Barrot, G.
    Mangin, A.
    Theodore, B.
    Guirlet, M.
    Renard, J.B.
    Fraisse, R.
    Snoeij, P.
    Koopman, R.
    Saavedra, L.
    Show allShow less
    Discipline
    Physical sciences
    Subject
    Atmospheric turbulence
    Correlation methods
    Data processing
    Regression analysis
    Scintillation
    Solar system
    Atmospheric limb transmittance
    GOMOS
    Small spectral features
    Stellar occulation
    Weather satellites
    Audience
    Scientific
    Date
    2005
    Metadata
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    Description
    GOMOS is a stellar occultation instrument onboard ENVISAT. It has already measured several hundreds of thousands occultations since March 2002. In some circumstances, the obliqueness of the star setting causes the remote sounding of possible horizontal turbulence that cannot be adequately corrected by using the fast photometer signals, leading to the presence of residual scintillation in the atmospheric transmittance. We investigate the mechanism that produces this spurious signal that may cause the retrieval of wavy constituent profiles. A special algorithm of vertical autoregressive smoothing (VAS) is proposed that takes into account the physical correlation between adjacent measurements at different tangent altitudes. A regularization parameter of the method may be optimized on basis of the minimal correlation between the residuals as prescribed by the Durbin-Watson statistics. The improvements obtained in the retrieval of both O3 and NO2 number density profiles is presented and discussed with respect to the results of the official data processing model.
    Citation
    Fussen, D.; Vanhellemont, F.; Bingen, C.; Kyrölä, B.; Tamminen, J.; Sofieva, V.; Hassinen, S.; Seppälä, A.; Verronen, P.T.; Bertaux, J.L.; Hauchecorne, A.; Dalaudier, F.; Fanton d'Andon, O.; Barrot, G.; Mangin, A.; Theodore, B.; Guirlet, M.; Renard, J.B.; Fraisse, R.; Snoeij, P.; Koopman, R.; Saavedra, L. (2005). Autoregressive smoothing of GOMOS transmittances. , Advances in Space Research, Vol. 36, Issue 5, 899-905, DOI: 10.1016/j.asr.2005.04.007.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4591
    doi: http://dx.doi.org/10.1016/j.asr.2005.04.007
    scopus: 2-s2.0-27744586619
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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