Lightning in Hurricanes

Molinari Idone/摘要 这项研究的目的是确定飓风中闪电发生的结构和机制。 这项研究将包括9个飓风，这些飓风都在国家闪电探测网络的标称范围内。 主要关注的是闪电所揭示的飓风对流结构，闪电作为风暴强度早期预警指标的可能性，以及风暴之间闪电变化的原因。 此外，天文台亦会研究热带气旋形成初期和后期闪电的变化。 这将提供有关飓风发展过程中对流作用的信息，以及飓风成熟时眼壁碎片在抑制闪电中的作用。 此外，闪电数据将与诺阿飓风研究司的多普勒和非多普勒雷达数据以及无线电探空仪数据相结合，以研究安德鲁飓风的雨带和埃琳娜飓风（1985年）眼壁闪电的波动。 在前一项研究中，目标是了解雨带的动力学和热力学，同时和一致的探空数据。 在后者中，我们感兴趣的是眼壁闪电的机制以及什么过程打开和关闭它。 最后，将使用国家闪电探测网络的数据对赠款期内发生的飓风进行调查。 这些数据应该允许检查云内和云对地的撞击。 主要的兴趣是飓风眼壁电气化的性质。

Molinari & Idone/Abstract The objective of this research is to determine the structure and mechanisms of lightning occurrence in hurricanes. This study will include nine hurricanes that have come within the nominal range of the National Lightning Detection Network. Of primary interest are the convective structure of hurricanes as revealed by the lightning, the potential for lightning as an early warning indicator of storm intensification, and the reasons for variation in lightning among storms. The variation of lightning between early and late stages of tropical cyclones will also be examined. This should provide information on the role of convection during hurricane development, and the role of eye wall debris in suppressing lightning as the hurricane matures. In addition, the lightning data will be combined with Doppler and non-Doppler radar data at the Hurricane Research Division of NOAA and with rawinsonde data in order to study rainbands in Hurricane Andrew and the fluctuation of eye wall lightning in Hurricane Elena (1985). In the former study the goal is to understand the dynamics and thermodynamics of a rainband for which simultaneous and coincident sounding data are available. In the latter, our interest is in the mechanism of eye wall lightning and what processes turn it on and off. Finally, hurricanes which occur within the grant period will be investigated using data from the National Lightning Detection Network. This data should allow examination of both intra-cloud and cloud-to-ground strokes. Of primary interest is the nature of hurricane eye wall electrification.