Preprints
https://doi.org/10.5194/amt-2023-179
https://doi.org/10.5194/amt-2023-179
21 Aug 2023
 | 21 Aug 2023
Status: this preprint is currently under review for the journal AMT.

Multi-wavelength dataset of aerosol extinction profiles retrieved from GOMOS stellar occultation measurements

Viktoria F. Sofieva, Monika Szelag, Johanna Tamminen, Didier Fussen, Christine Bingen, Filip Vanhellemont, Nina Mateshvili, Alexei Rozanov, and Christine Pohl

Abstract. In this paper, we present the new multi-wavelength dataset of aerosol extinction profiles, which are retrieved from the averaged transmittance spectra by the Global Ozone Monitoring by Occultation of Stars instrument on board the Envisat satellite.

Using monthly and zonally averaged transmittances as a starting point for the retrievals enables us to improve the signal-to-noise ratio and eliminate possible modulation of transmittance spectra by uncorrected scintillations. The two-step retrieval method is used: the spectral inversion is followed by the vertical inversion. The spectral inversion relies on the removal of contributions from ozone, NO2, NO3 and Rayleigh scattering from the optical depth spectra, for each ray perigee altitude. In the vertical inversion, the profiles of aerosol extinction coefficients at several wavelengths are retrieved from the collection of slant aerosol optical depth profiles.

The retrieved aerosol extinction profiles (FMI-GOMOSaero dataset v1) are provided in the altitude range 10–40 km at wavelengths 400, 440, 452, 470, 500, 525, 550, 672 and 750 nm, for the whole GOMOS operating period from August 2002 to March 2012.

The retrieved aerosol extinction profiles show a realistic wavelength dependence. Intercomparisons have shown that FMI-GOMOSaero aerosol profiles are in good agreement with other datasets and have suggested a better data quality compared to the previous GOMOS aerosol data.

Viktoria F. Sofieva et al.

Status: open (until 21 Oct 2023)

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  • RC1: 'Comment on amt-2023-179', Robert Damadeo, 08 Sep 2023 reply

Viktoria F. Sofieva et al.

Viktoria F. Sofieva et al.

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Short summary
We have developed the new multi-wavelength dataset of aerosol extinction profiles, which are retrieved from the averaged transmittance spectra by the Global Ozone Monitoring by Occultation of Stars instrument on board Envisat. The retrieved aerosol extinction profiles are provided in the altitude range 10–40 km at 400, 440, 452, 470, 500, 525, 550, 672 and 750 nm, for the period 2002–2012. FMI-GOMOSaero aerosol profiles have improved quality; they are in good agreement with other datasets.