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Ann. Geophys., 23, 3561-3568, 2005
www.ann-geophys.net/23/3561/2005/
© European Geosciences Union 2005
Remote sensing of aerosols over the oceans using MSG/SEVIRI imagery
F. Thieuleux1,2, C. Moulin1, F. M. Bréon1, F. Maignan1, J. Poitou1, and D. Tanré2
1IPSL/LSCE, CEA-CNRS, Gif-sur-Yvette, France
2LOA, CNRS-USTL, Villeneuve d’Ascq, France
Abstract. The SEVIRI instrument on board Meteosat Second Generation (MSG) offers new
capabilities to monitor aerosol transport over the Atlantic and the
Mediterranean at high temporal and spatial resolutions, in particular,
Saharan dust from North Africa, biomass-burning aerosols from subtropical
Africa and pollution from Europe. An inversion technique was developed to
estimate both aerosol optical thickness and Angström coefficients from
SEVIRI measurements at 0.63 and 0.81 µm. This method relies on an
optimized set of aerosol models to ensure a fast processing of
full-resolution MSG images and to allow the processing of long time series.
SEVIRI images for slots 45, 49 and 53 (11:15, 12:15, 13:15 UT) were
processed for June 2003. The retrieved optical thicknesses and Angström
coefficients are in good agreement with AERONET in-situ measurements in the
Atlantic and in the Mediterranean. Monthly mean maps of both parameters are
compared to that obtained with the polar orbiting sensor POLDER for June
2003. There is a good consistency between the two monthly means in terms of
optical thickness, but the Angström coefficients show significant
differences in the Atlantic zone which is affected by dust transport. These
differences may be explained by the lack of specific non-spherical dust
models within the inversion. The preliminary results presented in this paper
demonstrate, nevertheless, the potential of MSG/SEVIRI for the monitoring of
aerosol optical properties at high frequencies over the Atlantic and the
Mediterranean.
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