Error in the sampling area of an optical disdrometer: consequences in computing rain variables.
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ID: 75749
2013
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Abstract
The aim of this study is to improve the estimation of the characteristic uncertainties of optic disdrometers in an attempt to calculate the efficient sampling area according to the size of the drop and to study how this influences the computation of other parameters, taking into account that the real sampling area is always smaller than the nominal area. For large raindrops (a little over 6 mm), the effective sampling area may be half the area indicated by the manufacturer. The error committed in the sampling area is propagated to all the variables depending on this surface, such as the rain intensity and the reflectivity factor. Both variables tend to underestimate the real value if the sampling area is not corrected. For example, the rainfall intensity errors may be up to 50% for large drops, those slightly larger than 6 mm. The same occurs with reflectivity values, which may be up to twice the reflectivity calculated using the uncorrected constant sampling area. The Z-R relationships appear to have little dependence on the sampling area, because both variables depend on it the same way. These results were obtained by studying one particular rain event that occurred on April 16, 2006.
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fraile2013errorthescientificworldjournal
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| Authors | Fraile, R;Castro, A;Fernández-Raga, M;Palencia, C;Calvo, A I; |
| Journal | TheScientificWorldJournal |
| Year | 2013 |
| DOI |
10.1155/2013/369450
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