Autoregressive smoothing of GOMOS transmittances
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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.
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
2005Metadata
Show full item recordDescription
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
scopus: 2-s2.0-27744586619
Type
Article
Peer-Review
Yes
Language
eng