Shuo Wang, Yuuki Wada, Syugo Hayashi, Tomoo Ushio, V. Chandrasekar
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The results show that the radar-inferred strong electric fields distributed in a region of about 8.5–10 km during the developing stage, then extended from about 10 km to the cloud top during the mature stage, with an increasing IC lightning flash rate before the end of the mature stage. Subsequently, the electric fields weakened associated with a large amount of IC lightning discharges. The qualitative analysis results indicate that the evolution of the radar-inferred electric fields associated with the upper charge regions is consistent with the electrification process in the isolated thunderstorm, inferred by the IC lighting activity. In addition, there is a tendency for the increased IC lightning rate as the decrease in average composite <i>K</i><sub>DP</sub> in the middle and upper layers of the thunderstorm, with a time lag of about 5.5 min between the minimum average composite <i>K</i><sub>DP</sub> and the peak IC lightning rate, while a good correlation between the negative <i>K</i><sub>DP</sub> volume and the IC lightning flash rate at a lag of approximately 9 min.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":null,"pages":null},"PeriodicalIF":3.8000,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2023JD040681","citationCount":"0","resultStr":"{\"title\":\"Observation of Electrical Alignment Signatures in an Isolated Thunderstorm by Dual-Polarized Phased Array Weather Radar and the Relationship With Intracloud Lightning Flash Rate\",\"authors\":\"Shuo Wang, Yuuki Wada, Syugo Hayashi, Tomoo Ushio, V. 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引用次数: 0
摘要
雷暴中上部冰晶的电排列特征与云内的强电场有物理联系。本文利用 X 波段双极化多参数相控阵雷达的高时空分辨率,采用负 KDP 信号研究了孤立雷暴在其演变过程中的电场变化,以及负 KDP 信号与云内闪电活动之间的关系。结果表明,在发展阶段,雷达推断的强电场分布在约 8.5-10 km 的区域内,然后在成熟阶段从约 10 km 扩展到云顶,在成熟阶段结束前,云内闪电率不断上升。随后,与大量集成电路闪电放电相关的电场减弱。定性分析结果表明,与上部电荷区相关的雷达推断电场的演变与集成电路照明活动推断的孤立雷暴的电化过程一致。此外,随着雷暴中上层平均复合 KDP 的减少,集成电路闪电率也有增加的趋势,最小平均复合 KDP 与集成电路闪电率峰值之间的时滞约为 5.5 分钟,而负 KDP 量与集成电路闪电率之间的时滞约为 9 分钟,两者之间具有良好的相关性。
Observation of Electrical Alignment Signatures in an Isolated Thunderstorm by Dual-Polarized Phased Array Weather Radar and the Relationship With Intracloud Lightning Flash Rate
The electrical alignment signatures of ice crystals in the middle and upper parts of a thunderstorm have a physical connection with the strong electric fields within the cloud. By taking advantage of the high spatio-temporal resolution of an X-band dual-polarized multiparameter phased array radar, this paper employs negative KDP signatures to investigate the variation of electric fields in an isolated thunderstorm within its evolution, and the relationship between the negative KDP signatures and intracloud (IC) lightning activity. The results show that the radar-inferred strong electric fields distributed in a region of about 8.5–10 km during the developing stage, then extended from about 10 km to the cloud top during the mature stage, with an increasing IC lightning flash rate before the end of the mature stage. Subsequently, the electric fields weakened associated with a large amount of IC lightning discharges. The qualitative analysis results indicate that the evolution of the radar-inferred electric fields associated with the upper charge regions is consistent with the electrification process in the isolated thunderstorm, inferred by the IC lighting activity. In addition, there is a tendency for the increased IC lightning rate as the decrease in average composite KDP in the middle and upper layers of the thunderstorm, with a time lag of about 5.5 min between the minimum average composite KDP and the peak IC lightning rate, while a good correlation between the negative KDP volume and the IC lightning flash rate at a lag of approximately 9 min.
期刊介绍:
JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.