The recently launched geostationary meteorological satellite METEOSAT-8 with the excellent temporal resolution as well as with well suited spectral channels of SEVIRI instrument is a useful source of the information about cloud cover. The paper presents the work aimed at the validation of the cloud mask derived from MSG/SEVIRI data with the use of the NWC SAF software. The total cloudiness amount obtained from satellite data for each Polish synoptic station was compared with the simultaneous surface observation. The analysis was performed for three hourly observations. The preliminary results for the day time conditions show a good coherence of the satellite cloudiness retrieval with ground observations. Mean difference between these two variables ranges from -0.7 octas to 1.7 octas depending on the illumination conditions. The largest differences were found for nighttime and twilight observations. However, during the night, in snow conditions, the cloudiness is grossly overestimated by the satellite.
The paper presents the results of the work aimed at the application of visibility (meteorological visual range) data for UV modeling in Poland for summer season. In the first step, the meteorological visibility data were processed in order to obtain the monthly mean visibility maps that correspond to aerosols distribution over Poland. The usefulness of such maps was then validated through the comparison with AERONET data as well as the results of the UV radiation transfer model calculations. The comparison with AERONET data shows that monthly mean values of aerosol optical depth, calculated from visibility data, are in a good agreement with ground measurements for most summer months. The monthly mean visibility maps were then used in the UV radiation transfer modeling. The results of the comparative analysis performed for three Polish stations: Leba, Legionowo, Zakopane are presented and discussed. It has been shown that use of monthly mean visibility values leads to an improvement in the UV calculations quality as opposed to the calculations done with a priori assumed aerosol conditions.
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