Multiple Strokes Along the Same Channel to Ground in Positive Lightning Produced by a Supercell
Multiple Strokes Along the Same Channel to Ground in Positive Lightning Produced by a Supercell
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DOI：
10.1029/2021gl096714
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发表时间：
2021-12
影响因子：
5.2
通讯作者：
Yanan Zhu;P. Bitzer;V. Rakov;M. Stock;J. Lapierre;E. DiGangi;Z. Ding;Bruno L. Medina;L. Carey
中科院分区：
文献类型：
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作者：
Yanan Zhu;P. Bitzer;V. Rakov;M. Stock;J. Lapierre;E. DiGangi;Z. Ding;Bruno L. Medina;L. Carey
先前的研究表明，随后的正云对地闪电（+CG）闪光的先导很少穿过预先存在的通道到达地面。在本文中，我们提供的证据表明，这种情况实际上很常见，至少对于某些雷暴来说是这样。介绍了科尔多瓦阿根廷马克思米阵列 (CAMMA) 对阿根廷超级单体风暴中 +CG 闪光的观测结果，其中 84 次多冲程 +CG 闪光中有 54 次 (64%) 的后续先导遵循预先存在的接地通道。研究发现，这些后续的正向先导的行为与负向先导的行为相似，包括沿着预先存在的通道的传播速度，中值为 8 × 106 m/s，这与负向先导的传播速度相当。介绍并详细讨论了两种具有代表性的多冲程 +CG 闪光。本文报告的观察结果要求更新对正闪电和负闪电之间差异的传统解释。
Previous studies have shown that subsequent leaders in positive cloud‐to‐ground lightning (+CG) flashes rarely traverse pre‐existing channels to ground. In this paper, we present evidence that this actually can be common, at least for some thunderstorms. Observations of +CG flashes in a supercell storm in Argentina by Córdoba Argentina Marx Meter Array (CAMMA) are presented, in which 54 (64%) of 84 multiple‐stroke +CG flashes had subsequent leaders following a pre‐existing channel to ground. These subsequent positive leaders are found to behave similarly to their negative counterparts, including propagation speeds along pre‐existing channels with a median of 8 × 106 m/s, which is comparable to that of negative dart leaders. Two representative multiple‐stroke +CG flashes are presented and discussed in detail. The observations reported herein call for an update to the traditional explanation of the disparity between positive and negative lightning.