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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

基本信息

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

项目摘要

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.

该项目延续了早些时候就2000年初夏在堪萨斯州进行的STEPS方案(强雷暴带电和降水研究)观测到的风暴进行的分析和模拟工作。它包括对穿透风暴的T-28飞机收集的云、电和微物理数据进行分析，并用三维数值云模式模拟电荷和降水的产生。这项研究是与其他STEP调查人员合作进行的，他们将提供数据，包括用于识别降水类型的偏振雷达测量、用于确定雷暴运动结构的双多普勒雷达测量、气球携带的电场测量以及由甚高频闪电测图仪测量的闪电击打的三维地图。注意力将集中在2000年6月11日和6月29日的风暴上。一个主要的目标是解释为什么有些风暴主要产生正的云对地闪电放电，而另一些风暴产生负的放电。综合电学、微物理和风暴结构资料，将有助于更好地理解雷暴中闪电的形成机制，以及风暴的电学性质与其产生的降水之间的关系。