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| Titel |
On precipitation measurements collected by a weather radar and a rain gauge network |
| VerfasserIn |
S. Sebastianelli, F. Russo, F. Napolitano, L. Baldini |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 13, no. 3 ; Nr. 13, no. 3 (2013-03-11), S.605-623 |
| Datensatznummer |
250018383
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| Publikation (Nr.) |
 copernicus.org/nhess-13-605-2013.pdf |
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| Zusammenfassung |
| Many phenomena (such as attenuation and range degradation) can influence the
accuracy of rainfall radar estimates. They introduce errors that increase as
the distance from radar increases, thereby decreasing the reliability of
radar estimates for applications that require quantitative precipitation
estimation. The present paper evaluates radar error as a function of the
range, in order to correct the rainfall radar estimates. The radar is
calibrated utilizing data from the rain gauges. Then, the G/R ratio between the
yearly rainfall amount measured in each rain gauge position during 2008 and
the corresponding radar rainfall amount is calculated against the slant
range. The trend of the G/R ratio shows two behaviours: a concave part due to the
melting layer effect close to the radar location and an almost linear,
increasing trend at greater distances. A best fitting line is used to find
an adjustment factor, which estimates the radar error at a given range. The
effectiveness of the methodology is verified by comparing pairs of rainfall
time series that are observed simultaneously by collocated rain gauges and
radar. Furthermore, the variability of the adjustment factor is investigated
at the scale of event, both for convective and stratiform events. The main
result is that there is not a univocal range error pattern, as it also
depends on the characteristics of the considered event. On the other hand,
the adjustment factor tends to stabilize itself for time aggregations of the
order of one year or greater. |
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