Calculations of Doppler Radar Velocity Spectrum Parameters for a Mixture of Rain and Hail
AffiliationInstitute of Atmospheric Physics, The University of Arizona
KeywordsRain and rainfall -- Measurement.
Hail -- Measurement.
Doppler radar -- Scientific applications.
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AbstractThe radar reflectivity factors, the reflectivity-weighted mean terminal velocities (VT) and the standard deviations (cr) of the resulting VT Doppler spectra were computed for specified size distributions of rain, dry and wet ice spheres (taken to be hailstones) and rain with hail. Unambiguous estimates of the mean velocity and standard deviation can be obtained from a radar measurement of reflectivity for rain alone and dry ice spheres as a function of maximum sphere size. The results for wet ice spheres are strongly dependent on the thickness of the liquid water coating on the ice core. When rain and hail coexist, large values of reflectivity are associated with large ranges of VT and crv. If the shape of the hail size distribution is known, an independent measurement of the maximwn hailstone diameter or a knowledge of the standard deviation of the observed Doppler velocity spectrum can reduce the uncertainty in estimates of VT.
Series/Report no.University of Arizona, Institute of Atmospheric Physics,Scientific Report No. 30
SponsorsResearch supported by the Atmospheric Sciences Section, National Science Foundation, NSF Grant DES 73-06558A01
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