Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 8
Articles | Volume 19, issue 8
https://doi.org/10.5194/amt-19-2787-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-2787-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 8
Research article
 | 
28 Apr 2026
Research article |  | 28 Apr 2026

Assessing Earth's sphericity effects in the specific case of geostationary satellite observations: focus on operational land/aerosol applications from Meteosat Third Generation-Imager

Gloria Klein, Xavier Ceamanos, Jérôme Vidot, Didier Ramon, and Mustapha Moulana

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Cited articles

Adams, C. N. and Kattawar, G. W.: Radiative transfer in spherical shell atmospheres: I. Rayleigh scattering, Icarus, 35, 139–151, https://doi.org/10.1016/0019-1035(78)90067-2, 1978. a, b, c, d, e
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Boukabara, S.-A., Eyre, J., Anthes, R. A., Holmlund, K., St. Germain, K. M., and Hoffman, R. N.: The Earth-Observing Satellite Constellation: A review from a meteorological perspective of a complex, interconnected global system with extensive applications, IEEE Geosci. Remote Sens. Mag., 9, 26–42, https://doi.org/10.1109/MGRS.2021.3070248, 2021. a
Buras, R. and Mayer, B.: Efficient unbiased variance reduction techniques for Monte Carlo simulations of radiative transfer in cloudy atmospheres: The solution, J. Quant. Spectrosc. Radiat. Transf., 112, 434–447, https://doi.org/10.1016/j.jqsrt.2010.10.005, 2011. a
Ceamanos, X., Six, B., Moparthy, S., Carrer, D., Georgeot, A., Gasteiger, J., Riedi, J., Attié, J.-L., Lyapustin, A., and Katsev, I.: Instantaneous aerosol and surface retrieval using satellites in geostationary orbit (iAERUS-GEO) – estimation of 15 min aerosol optical depth from MSG/SEVIRI and evaluation with reference data, Atmos. Meas. Tech., 16, 2575–2599, https://doi.org/10.5194/amt-16-2575-2023, 2023. a, b, c, d
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This work investigates the impact of the Earth's sphericity on geostationary satellite observations, particularly in the context of the operational estimation of aerosol and land surface properties from the Meteosat Third Generation-Imager's Flexible Combined Imager. We demonstrate that the plane-parallel approximation widely used in fast radiative transfer codes can introduce significant biases in certain situations, mainly depending on the observing geometry and wavelength.
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