Numerical Modeling of Convective Behavior, Structure and Initiation

对流行为、结构和引发的数值模拟

• 批准号: 9421847
• 负责人: Robert Fovell
• 金额: $ 31.31万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-15 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9421847&HistoricalAwards=false
• 关键词: Numerical; Modeling; Convective; Behavior; Structure

9421847 Fovell Thunderstorms are of interest because of both the severe weather and the beneficial rainfall that they produce. A certain class of thunderstorms, known as multicellular storms, are very common in the Spring/Summer months and typically are not severe, but bring much needed rainfall. As their name implies, these storms are composed of a sequence of individual updrafts ( cells ) and their concomitant precipitation. While much have been learned about the behavior of multicellular storms, a few fundamental problems still remain. One such problem is that the factors that control the periodicity of cell formation and their temporal behavior have never been determined. Using an advanced numerical model, the Principal Investigator will attack this problem. Additionally, he will investigate how these storm modify their upstream conditions and, hence, potentially the future evolution of the storm. A third area of investigation is to study the structure and evolution of sea-breeze fronts and their role in convective initiation. While on the surface sea-breeze fronts and multicellular storms are quite different, they do share dynamic similarities that make these studies related. If successful, this research will lead to much improved understanding of the underlying dynamics of the ubiquitous multicellular thunderstorms. ***

9421847 福维尔雷暴因其恶劣的天气和有益的降雨而受到关注。 一类雷暴，称为多细胞风暴，在春夏季非常常见，通常并不严重，但会带来急需的降雨。 顾名思义，这些风暴由一系列单独的上升气流（单元）及其伴随的降水组成。 尽管人们对多细胞风暴的行为已经有了很多了解，但仍然存在一些基本问题。 其中一个问题是，控制细胞形成周期性及其时间行为的因素从未被确定。 首席研究员将使用先进的数值模型来解决这个问题。 此外，他还将研究这些风暴如何改变其上游条件，以及风暴未来的潜在演变。 第三个研究领域是研究海风锋的结构和演化及其在对流引发中的作用。 虽然从表面上看，海风锋和多细胞风暴有很大不同，但它们确实具有动态相似性，使这些研究具有相关性。 如果成功，这项研究将大大提高对普遍存在的多细胞雷暴的潜在动力学的理解。 ***