The simulation and error analysis of raindrop size distribution obtained by micro rain radar

作     者：JIANG Shiyang GAO Taichang LIU Xichuan 

作者机构：College of Meteorology and OceanographyPLA University of Science and Technology 

出 版 物：《Instrumentation》 (仪器仪表学报（英文版）)

年 卷 期：2015年第2卷第3期

页      面：43-54页

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：supported by National Natural Science Foundation of China ( Grant No. 41327003 41475020 and 41505135) 

主　　题：DSD M ie theory the vertical wind air turbulence error analysis 

摘      要：Observation of raindrop size distribution( DSD) with a vertically pointing micro rain radar( MRR) has important significance in the precipitation measurement field. The Mie scattering of large particle,vertical wind and air turbulence have great influences on the retrieval of DSD measured by MRR. This paper simulates the process of how three factors affect the inversion of DSD and the calculation of other precipitation parameters,then makes the errors analysis. Because the wavelength of MRR is 12.5mm,M ie theory is more suitable for the precipitation particle than Rayleigh approximation,w hich may cause the underestimation of number density of small droplets and the overestimation of that in middle field. The vertical wind results in inaccurate estimation of particle terminal velocity,so the diameter is measured with some errors by empirical relationship,w hich affects the calculating accuracy of radar reflectivity and rain rate. Air turbulence can broaden the pow er spectral density,of which the impact on the inversion of DSD are concentrated in small droplets field. Then the measured data from MRR is analyzed and the results prove the impacts of those factors. Finally,according to the analysis and application limits,the prospect of the future research trend of particle size distribution is conducted.