Determination of Dominant-Scattering Raindrops' Size Using Dual-Polarization Radar Observations

Jianbing Li, V. Chandrasekar, XueSong Wang
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引用次数: 1

Abstract

For a flow involved with a number of particles of different sizes, it is difficult to retrieve the flow's characteristic parameters from the particles' Doppler velocity alone because the correspondences between particle sizes and Doppler components are difficult to discriminate. A feasible retrieval approach is to find out the dominant-scattering particles (making the most prominent contribution to the maximum Doppler component) and solve the motion equation of these particles with their Doppler velocity. In this approach, the first key issue is to determine the Dominant-Scattering particles' size. Taking rainfall as the physical medium, this paper proposes the relationships between the Dominant-Scattering raindrops' size $(D_{s})$ and the polarimetric variables (circular depolarization ration $C_{dr}$ or differential reflectivity $Z_{dr}$) through a series of scattering simulations. Results show that $C_{dr}$ is a good polarimetric variable to discriminate the Dominant-Scattering raindrop size, and the relationship $D_{s}-C_{dr}$ for different radar observation angles can be fitted to very simple polynomials.
利用双偏振雷达观测确定主散射雨滴大小
对于包含许多不同大小颗粒的流动,由于颗粒大小和多普勒分量之间的对应关系难以区分,因此仅从颗粒的多普勒速度中检索流动的特征参数是困难的。一种可行的反演方法是找出对最大多普勒分量贡献最大的主要散射粒子,用它们的多普勒速度求解这些粒子的运动方程。在这种方法中,第一个关键问题是确定主导散射粒子的大小。本文以降雨为物理介质,通过一系列的散射模拟,提出了优势散射雨滴尺寸$(D_{s})$与偏振变量(圆去极化比$C_{dr}$或微分反射率$Z_{dr}$)之间的关系。结果表明,$C_{dr}$是判别主散射雨滴大小的一个很好的极化变量,且不同雷达观测角度的$D_{s}-C_{dr}$关系可以拟合成非常简单的多项式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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