first results on a process-oriented rain area classification technique using meteosat second generation seviri nighttime data

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ID: 185487
2008
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Abstract
A new technique for process-oriented rain area classification using Meteosat Second Generation SEVIRI nighttime data is introduced. It is based on a combination of the Advective Convective Technique (ACT) which focuses on precipitation areas connected to convective processes and the Rain Area Delineation Scheme during Nighttime (RADS-N) a new technique for the improved detection of stratiform precipitation areas (e.g. in connection with mid-latitude frontal systems). The ACT which uses positive brightness temperature differences between the water vapour (WV) and the infrared (IR) channels (&Delta;T<sub>WV-IR</sub>) for the detection of convective clouds and connected precipitating clouds has been transferred from Meteosat First Generation (MFG) Metesoat Visible and Infra-Red Imager radiometer (MVIRI) to Meteosat Second Generation (MSG) Spinning Enhanced Visible and InfraRed Imager (SEVIRI). RADS-N is based on the new conceptual model that precipitating cloud areas are characterised by a large cloud water path (<i>cwp</i>) and the presence of ice particles in the upper part of the cloud. The technique considers information about both parameters inherent in the channel differences &Delta;T<sub>3.9-10.8</sub>, &Delta;T<sub>3.9-7.3</sub>, &Delta;T<sub>8.7-10.8</sub>, and &Delta;T<sub>10.8-12.1</sub>, to detect potentially precipitating cloud areas. All four channel differences are used to gain implicit knowledge about the <i>cwp</i>. &Delta;T<sub>8.7-10.8</sub> and &Delta;T<sub>10.8-12.1</sub> are additionally considered to gain information about the cloud phase. First results of a comparison study between the classified rain areas and corresponding ground based radar data for precipitation events in connection with a cold front occlusion show encouraging performance of the new proposed process-oriented rain area classification scheme.
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Authors B. Thies, T. Nauss, J. Bendix
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Journal journal of the medical library association
Year 2008
DOI
DOI not found
URL
http://www.adv-geosci.net/16/63/2008/adgeo-16-63-2008.pdf
Keywords
sciencegeologydynamic and structural geology

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