Vertical reflectivity structures near lightning flashes in the stratiform regions of mesoscale convective systems
Vertical reflectivity structures near lightning flashes in the stratiform regions of mesoscale convective systems
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中尺度对流系统层状区域闪电附近的垂直反射率结构
DOI：
10.1016/j.atmosres.2020.104961
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发表时间：
2020-04
影响因子：
5.5
通讯作者：
郑栋
中科院分区：
文献类型：
--
作者：
王飞;张义军;刘恒毅;董万胜;姚雯;郑栋
利用s波段多普勒雷达和甚高频辐射源定位系统，对重庆地区14个中尺度对流系统（mcs）的层状区（层状闪电）发生的254次闪电进行了观测，并分析了闪电通道周围区域的垂直反射率结构。在大多数层状闪电中，垂直反射率结构可分为三大类：单层、双层和三层。其中单层结构闪光最多（65.0%），其次是双层结构闪光（26.8%）和三层结构闪光（1.2%）。推断单层结构和双层结构区域在层状区中部存在不同强度的中尺度上升气流。约62.3%的单层结构闪光在垂直反射率核以上0 ~ 4 km范围内起爆，且主要起爆范围随垂直反射率核的增大而变宽。大约49.2%和12.7%的双层结构闪光分别发生在垂直反射率核以上3 ~ 6km和1 ~ 2km处。距离垂直反射率核心较远处的起雷概率高于距离较近处的起雷概率。这可能意味着在熔融过程中发生的一些带电现象并不像预期的那样强烈，而在层状区域中部微弱但广泛的中尺度上升气流中发生的非环状非感应充电过程可能对层状闪电的发生更为重要。
Using an S-band Doppler radar and a very high frequency (VHF) radiation source location system, 254 lightning flashes occurring in stratiform regions (stratiform lightning flashes) of 14 mesoscale convective systems (MCSs) in Chongqing, China, were observed and used to analyze the structure of vertical reflectivity in the area around the lightning channel. In most stratiform lightning flashes, the vertical reflectivity structures can be grouped into three general categories: single-layer, double-layer, and triple-layer. The single-layer structure flashes are the most numerous (65.0%), followed by the double-layer (26.8%) and triple-layer (1.2%) flashes. The regions with the single-layer structure and the double-layer structure are inferred to have mesoscale updrafts of different intensity in the middle of stratiform region. Around 62.3% of the single-layer structure flashes initiate within 0–4 km above the vertical reflectivity core, and the main initiation range of these flashes widens with increasing value of the vertical reflectivity core. Around 49.2% and 12.7% of the double-layer structure flashes initiate within 3–6 km and 1–2 km above the vertical reflectivity core, respectively. The probability of lightning initiation at a greater distance to the vertical reflectivity core is higher than that at a shorter distance. This may imply that some electrifications occurring during the melting process are not as strong as expected and a non-riming non-inductive charging process occurring in a weak but broad mesoscale updraft in the middle of stratifom region may be more important for initiation of stratiform lightning flashes.
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影响因子：
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作者：
M. Stolzenburg;W. D. Rust;T. Marshall
通讯作者：
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DOI：
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发表时间：
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发表时间：
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影响因子：
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通讯作者：
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DOI：
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发表时间：
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影响因子：
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