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| Titel |
First results on a process-oriented rain area classification technique using Meteosat Second Generation SEVIRI nighttime data |
| VerfasserIn |
B. Thies, T. Nauss, J. Bendix |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Observation, Prediction and Verification of Precipitation (EGU Session 2007) ; Nr. 16 (2008-04-09), S.63-72 |
| Datensatznummer |
250013072
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| Publikation (Nr.) |
 copernicus.org/adgeo-16-63-2008.pdf |
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| Zusammenfassung |
| 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 (ΔTWV-IR) 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 (cwp) 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
ΔT3.9-10.8, ΔT3.9-7.3, ΔT8.7-10.8, and
ΔT10.8-12.1, to detect potentially precipitating cloud areas. All four
channel differences are used to gain implicit knowledge about the cwp. ΔT8.7-10.8
and ΔT10.8-12.1 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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