Tropical Cyclones

9424201伊曼纽尔博士将继续调查热带气旋发展和演变的几个方面的原因。研究工作的第一部分将是完成对墨西哥热带试验期间采集的数据的分析。完成后，将根据完成的数据和简单的案例数值模拟来分析四个飓风的发展，以检验为解释观测结果而形成的物理假设。在另一项单独的调查中，PI将检验他的假设，即飓风中的螺旋带是咆哮线，其相对于飓风在每个点的垂直切变的方向是由平均切变与飓风表面附近发现的冷空气池的动力学相互作用确定的。这将使用三维整体模型进行测试。最后，PI将开始对飓风中观察到的同心眼壁进行研究，通过数值研究来验证他的假设，即眼壁的循环是成熟飓风环流中由风引起的表面热交换不稳定的一种形式。所有这些努力对于增进我们对热带气旋行为的了解都很重要。该奖项由中尺度和大型动力气象计划共同支持。***

9424201 Emanuel Dr. Emanuel will continue to investigate several aspects of the reasons for the development and evolution of tropical cyclones. The first part of the research effort will be to complete the analyses of data taken during the Tropical Experiment in Mexico (TEXMEX). When completed, the development of four hurricanes will have been analyzed from the data and simple numerical simulations of the cases completed to test the physical hypotheses formed to explain the observations. In a separate investigation, the PI will test his hypothesis that spiral bands in hurricanes are squall lines whose orientation with respect to the hurricane's vertical shear at each point is determined by the interaction of the mean shear with the dynamics of the cold pool of air found near the surface in hurricanes. This will be tested using a three- dimensional ensemble model. Finally, the PI will begin a study on the concentric eyewalls that are observed in hurricanes, seeking through numerical studies to test his hypothesis that the cycles of the eyewalls are a form of wind-induced surface heat exchange instability of the mature hurricane circulation. All of these efforts are important in improving our understanding of the behavior of tropical cyclones. This award is jointly supported by the Mesoscale and Large-scale Dynamic Meteorology Programs. ***