Abstract:
Since 2005, the Institute of Atmospheric Physics (IAP) of the Chinese Academy of Sciences (CAS) has been conducting the SHAndong Triggering Lightning Experiment (SHATLE) in Binzhou, Shandong Province. This paper reviews the key achievements of the experiment from 2005 to 2025. We specially designed and developed trailing-wire-rocket for triggering lightning experiment, a technology that has since been adopted in all triggering lightning experiments across China. The experiment observed, for the first time in China, the microsecond-resolution lightning current waveforms and their corresponding close-range electric field variations, and a comprehensive dataset has accumulated in the last two decades. Through the continuous development and upgrading of high spatiotemporal resolution lightning detection technologies, the study has revealed the intermittent and stepping propagation characteristics and mechanisms of positive leaders, proposed novel mechanisms for the interaction between lightning and ground objects, and identified the influence of intracloud discharge processes on lightning grounding and M-component processes. Based on observational data and analysis, modeling and numerical simulation studies of triggered lightning discharge processes were conducted, leading to improvements in the understanding of M-component mechanisms and the establishment of quantitative relationships among lightning-neutralized charge, channel currents, and electromagnetic field variations. The experiments also revealed the effects of lightning and thunderstorms on the middle and upper atmosphere through the induced Transient Luminous Events above the thundercloud. Recent studies have further uncovered the influence of lightning and thunderstorms on atmospheric composition. Moreover, the rocket-triggering lightning platform have also played a significant role in testing and improving lightning protection technologies for lightning-sensitive industries such as telecommunications, petrochemicals, power systems, and so on.