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Potential uses of the differential propagation phase constant to estimate raindrop and hailstone size distributions

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2 Author(s)
Steinhorn, I. ; NOAA, Norman, OK, USA ; Zrnic, D.S.

One of the Doppler radars operated by the National Severe Storms Laboratory can measure the difference between propagation phase constants KDp at horizontal and vertical polarization. This study examines the use of this parameter K Dp in addition to the reflectivity factor ZH and the differential reflectivity ZDR, to obtain information about rain and hail. It is shown from theory and experiments that a third parameter of the drop size distribution, obtained from KDP, can be used to support Z DR measurement and/or to point out mixed-phase hydrometeors. Quantitative information on hail size distribution can be obtained for small hailstones when their major axes are nearly vertically aligned, giving rise to negative ZDR and KDP values

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:26 ,  Issue: 5 )