Analysis of Echo Characteristics of Dual-Polarization Doppler Weather Radar in Lightning Weather

2019 International Conference on Meteorology Observations (ICMO) Pub Date : 2019-12-01 DOI:10.1109/ICMO49322.2019.9026028

Shaofeng Wu, Jinglu Si, Dongming Hu, Zaihua Guo, Yu Zhang, Qin Zhao

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Abstract

Based on the detection of dual-polarized radar, combined with the observation data of lightning, parts of the radar observation products are analyzed for some lightning weather processes occurred in Guangzhou. By studying the variation characteristics of these products before and after the first flash, the lightning nowcasting method based on radar data is offered. In the process of studying radar parameters variation of lightning weather, this paper analyzes the characteristics of radar echoes in different time periods, counts the distribution of polarization parameters, and judges the development process of thunderstorms according to the echo intensity and echo area of different stages. The results show that during lightning, the echo intensity Z, the echo top height ET, the differential reflectivity factor Zdr, the differential propagation phase shift rate Kdp and the vertical accumulated liquid water content VIL of the convective cloud have obvious changes. The radar detection of polarized weather can realize the discrimination of thunderstorm formation state and lightning warning.

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雷电天气下双偏振多普勒天气雷达回波特性分析

在双极化雷达探测的基础上，结合闪电的观测资料，对广州地区发生的一些闪电天气过程进行了部分雷达观测产品的分析。通过研究这些产品在第一次闪电前后的变化特征，提出了基于雷达数据的闪电临近预报方法。在研究雷电天气的雷达参数变化过程中，分析了雷达回波在不同时段的特征，统计了极化参数的分布，根据不同阶段的回波强度和回波面积判断雷暴的发展过程。结果表明:雷击时，对流云的回波强度Z、回波顶高度ET、差分反射率因子Zdr、差分传播相移速率Kdp和垂直累积液态水含量VIL发生明显变化;极化天气雷达探测可以实现雷暴形成状态判别和雷电预警。

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2019 International Conference on Meteorology Observations (ICMO)

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