Radar Reflectivity and Rainfall Rate Relation from Weibull Raindrop-Size Distribution

Hua JIANG  Motoaki SANO  Matsuo SEKINE  

IEICE TRANSACTIONS on Communications   Vol.E79-B   No.6   pp.797-800
Publication Date: 1996/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Weather Radar Technology)
raindrop-size distribution,  Z-R relation,  TRMM radar equation,  

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We have compared the various raindrop-size distributions (DSD) with the recent experimental data collected by the distrometer. It is shown that the Weibull distribution is the best fit to the experimental data for drizzle, widespread and thunderstorm rain cases. By using this Weibull DSD, we obtained a new expression of the radar reflectivity factor (Z) and the rainfall rate (R) relation, that is Z=285R1.48, which gives few errors comparing to some measurements in TRMM frequency of 14GHZ.