Combination of Meteosat- and synoptic data to determine rainfall: A case study |
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| Authors: | J Aschbacher |
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| Institution: | (1) Present address: Institut für Meteorologie und Geophysik, Universität Innsbruck, Innrain 52, A-6020 Innsbruck, Austria |
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| Abstract: | Summary A pilot study was carried out to determine the capability of satellite data for mapping rainfall and to prove possibilities for combination with synoptic parameters. The investigations were based on digital infrared Meteosat data of the central and southern European region during two periods in 1979. The effective infrared emission temperatures were combined with parameters derived from synoptic maps. The rainfall distribution was extracted from synoptic surface data. The vorticity and its advection with the thermal wind were derived from the 850 hPa and 500 hPa topographies. For the investigated periods appreciable agreement was observed between the rainfall areas and the areas with positive advection of vorticity. Another requirement for the occurrence of precipitation is a relative minimum of cloud top temperature and vorticity. As supplement to synoptic charts satellite data are able to provide information on rainfall areas with high areal and temporal resolution.With 6 Figures |
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