Numerical Modeling of Convective Behavior, Structure and Initiation

9421847个沙丘雷暴之所以引人注目，是因为它们带来了恶劣的天气和有益的降雨。一种被称为多单体风暴的雷暴在春夏月份非常常见，通常不会很严重，但会带来急需的降雨。顾名思义，这些风暴是由一系列单独的上升气流(单体)及其伴随的降水组成的。虽然关于多细胞风暴的行为已经了解了很多，但一些根本的问题仍然存在。其中一个问题是，控制细胞形成周期及其时间行为的因素从未被确定。使用先进的数值模型，首席调查员将解决这个问题。此外，他将调查这些风暴如何改变其上游条件，从而潜在地研究风暴的未来演变。第三个研究领域是研究海风锋面的结构和演变及其在对流引发中的作用。虽然表面上海风锋面和多细胞风暴有很大的不同，但它们在动力学上确实有相似之处，这使得这些研究相互关联。如果成功，这项研究将大大改善对无处不在的多细胞雷暴潜在动力学的理解。***

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. ***