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- W2077542464 abstract "Abstract Spatial resolution of precipitation measurements by weather radar gets worse with increasing distance from the radar, which is especially disturbing in case of space-borne rain radar sensors, operating with footprint diameters up to 10 km and more. Precipitation structures, in particular intensive showers and convective events, are rarely expected to be homogeneous over such distances, or may even be smaller than the radar footprint area. One is therefore confronted with the problem of inhomogeneous/incomplete beam filling, which introduces additional uncertainty when retrieving area-averaged precipitation rate R from area-averaged radar reflectivity Z. Building upon low-elevation PPI scans performed with the dual-polarisation frequency-agile research radar Graz-Hilmwarte, the degree of radar overestimation of precipitation and its dependence on precipitation type has been studied. The method applied was to use reflectivity data from this (spatially) high resolution data base and to simulate coarser resolution by combining several of the small echo cells into larger ones, assuming the original small cells being filled homogeneously. Three typical sample events are discussed in detail. Whereas for widespread rain the predicted and true rainfall rates match well, in extreme convective cases (single small cell) and large footprint area the predicted rainfall can be several times the true one." @default.
- W2077542464 created "2016-06-24" @default.
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- W2077542464 date "2000-01-01" @default.
- W2077542464 modified "2023-09-26" @default.
- W2077542464 title "Rainfall overestimates induced by radar area averaging" @default.
- W2077542464 doi "https://doi.org/10.1016/s1464-1909(00)00134-9" @default.
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