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In radar polarimetry, the differential phaseconsists of the propagation differential phaseand the backscatter differential phase    . Whileis commonly used for attenuation correction (i.e., estimation of the specific attenuation  A  and specific differential phase    ), recent studies have demonstrated thatcan provide information concerning the dominant size of raindrops. However, the estimation ofandis not straightforward given their coupled nature and the noisy behavior of    , especially over short paths. In this work, the impacts of estimatingon the estimation of  A  over short paths, using the extended version of the ZPHI method, are examined. Special attention is given to the optimization of the parameter  α  that connectsand  A . In addition, an improved technique is proposed to computefromandin rain. For these purposes, diverse storm events observed by a polarimetric X-band radar in the Netherlands are used. Statistical analysis based on the minimum errors associated with the optimization of  α  and the consistency betweenand  A  showed that more accurate and stable  α  and  A  are obtained ifis estimated at range resolution, which is not possible by conventional range filtering techniques. Accurateestimates were able to depict the spatial variability of dominant raindrop size in the observed storms. By following the presented study, the ZPHI method and its variations can be employed without the need for considering long paths, leading to localized and accurate estimation of  A  and    .

Improved Estimation of the Specific Attenuation and Backscatter Differential Phase over Short Rain Paths