Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 5.509 IF 5.509
  • IF 5-year value: 5.689 IF 5-year 5.689
  • CiteScore value: 5.44 CiteScore 5.44
  • SNIP value: 1.519 SNIP 1.519
  • SJR value: 3.032 SJR 3.032
  • IPP value: 5.37 IPP 5.37
  • h5-index value: 86 h5-index 86
  • Scimago H index value: 161 Scimago H index 161
Volume 9, issue 23 | Copyright

Special issue: GOMOS (Global Ozone Monitoring by Occultation of Stars): data...

Atmos. Chem. Phys., 9, 9197-9207, 2009
https://doi.org/10.5194/acp-9-9197-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  07 Dec 2009

07 Dec 2009

Influence of scintillation on quality of ozone monitoring by GOMOS

V. F. Sofieva1, V. Kan2, F. Dalaudier3, E. Kyrölä1, J. Tamminen1, J.-L. Bertaux3, A. Hauchecorne3, D. Fussen4, and F. Vanhellemont4 V. F. Sofieva et al.
  • 1Earth observation, Finnish Meteorological Institute, Helsinki, Finland
  • 2Organization of Russian Academy of Sciences A.M. Obukhov Institute of Atmospheric Physics RAS, Moscow, Russia
  • 3LATMOS, Université Versailles Saint-Quentin; CNRS/INSU, Verrières-le-Buisson, France
  • 4Institut d'Aeronomie Spatiale de Belgique, Brussels, Belgium

Abstract. 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 0.5–1.5% 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.

Download & links
Publications Copernicus
Special issue
Download
Citation
Share