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| Titel |
South African Weather Service operational satellite based precipitation estimation technique: applications and improvements |
| VerfasserIn |
E. Coning, E. Poolman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 4 ; Nr. 15, no. 4 (2011-04-06), S.1131-1145 |
| Datensatznummer |
250012741
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| Publikation (Nr.) |
 copernicus.org/hess-15-1131-2011.pdf |
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| Zusammenfassung |
| Extreme weather related to heavy or more frequent precipitation events seem
to be a likely possibility for the future of our planet. While precipitation
measurements can be done by means of rain gauges, the obvious disadvantages
of point measurements are driving meteorologists towards remotely sensed
precipitation methods. In South Africa more sophisticated and expensive
nowcasting technology such as radar and lightning networks are available,
supported by a fairly dense rain gauge network of about 1500 daily gauges.
In the rest of southern Africa rainfall measurements are more difficult to
obtain. The local version of the Unified Model and the Meteosat Second
Generation satellite data are ideal components of precipitation estimation
in data sparse regions such as Africa. In South Africa hourly accumulations
of the Hydroestimator (originally from NOAA/NESDIS) are currently used as a
satellite based precipitation estimator for the South African Flash Flood
Guidance system, especially in regions which are not covered by radar. In
this study the Hydroestimator and the stratiform rainfall field from the
Unified Model are both bias corrected and then combined into a new
precipitation field. The new product was tested over a two year period and
provides a more accurate and comprehensive input to the Flash Flood Guidance
systems in the data sparse southern Africa. Future work will include
updating the period over which bias corrections were calculated. |
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