Further Analysis and Modeling Studies of Severe Thunderstorm Electrification and Precipitation Study (STEPS) Cases

强雷暴带电和降水研究（STEPS）案例的进一步分析和建模研究

• 批准号: 0245147
• 负责人: John Helsdon
• 金额: $ 26.1万
• 依托单位: South Dakota School of Mines and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2006-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0245147&HistoricalAwards=false
• 关键词: Further; Analysis; Modeling; Studies; Severe

This project continues the work initiated earlier on analysis and modeling of storms observed on the STEPS program (Severe Thunderstorm Electrification and Precipitation Study) conducted in Kansas in the early summer of 2000. It includes the analysis of cloud electrical and microphysical data collected by the storm-penetrating T-28 aircraft and modeling the production of charge and precipitation with a three-dimensional numerical cloud model. The research is carried out in collaboration with other STEPS investigators, who will provide data including polarimetric radar measurements to identify precipitation type, dual-Doppler radar measurements to define the kinematic structure of thunderstorms, balloon-borne electrical field measurements, and three-dimensional maps of lightning strokes measured by a VHF lightning mapper. Attention will focus on the storms of 11 June and 29 June 2000. A major objective is to explain why some storms produce predominantly positive cloud-to-ground lightning discharges while others produce negative discharges. A synthesis of the electrical, microphysical, and storm-structure data will lead to a better understanding of the mechanism of lightning formation in thunderstorms and the relations between electrical properties of storms and the precipitation they produce.

该项目延续了2000年初夏在堪萨斯州进行的STEPS项目（强雷暴电气化和降水研究）对观测到的风暴进行分析和建模的早期工作。它包括对T-28飞机收集的云电和微物理数据的分析，以及用三维数值云模型模拟电荷和降水的产生。该研究是与STEPS的其他研究人员合作进行的，他们将提供数据，包括偏振雷达测量，以确定降水类型，双多普勒雷达测量，以确定雷暴的运动结构，气球载电场测量，以及由VHF闪电绘图仪测量的雷击三维地图。我们将集中注意2000年6月11日和6月29日的风暴。一个主要的目标是解释为什么一些风暴主要产生正的云对地闪电放电，而另一些则产生负的放电。电学、微物理和风暴结构数据的综合将有助于更好地理解雷暴中闪电形成的机制，以及风暴的电学性质与其产生的降水之间的关系。