Aerosol retrievals from METEOSAT-8 - CM SAF

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SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0 Issue : 1.0 Date : 4 October 2006 Fig. 12 to 15 present for the 4 AERONET locations the relationship between observed and MSG/SEVIRI retrieved Aerosol Optical Thickness. Big discrepancies appear for some hours of the day (around 13:00 UTC for Toulouse and 12:00 UTC for Blida), which should be due to the use of an inappropriate phase function, especially for particular scattering angles. For the El Arenosillo station, MSG tends to overestimate the AOT between 12:00 and 15:00 UTC. We can remark that the standard deviation in the box of 5x5 pixels is high during these hours, in the order of 0.2, whereas the standard deviation is less than 0.06 for the rest of the day. Large standard deviations can be used as an index of the quality, indicating large spatial variability of the surface reflectance or the presence of thin clouds. As expected the agreement is better for sites where the surface reflectance is not too high (Toulouse and Ispra) and when the aerosol is surely non dust. In other places with high surface reflectance and presence of dust, the quantitative comparison is not yet satisfactory. Fig.12: Temporal variation of the aerosol optical thickness at 670nm derived from AERONET and MSG for the 2 nd and 14 th July 2005 over Toulouse (South-West of France) - 28 -
SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0 Issue : 1.0 Date : 4 October 2006 Fig.13: Temporal variation of the AOT at 670nm derived from AERONET and MSG for the 12 th and 14 th of July over Ispra (Italy) Fig.14: Temporal variation of the AOT at 670nm derived from AERONET and MSG for the 10 th and 14 th of July over El Arenosillo (Andalousia-(Spain) - 29 -
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Aerosol retrievals from METEOSAT-8 - CM SAF

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