Dynamics of the Tropical Troposphere

热带对流层动力学

• 批准号: 0332197
• 负责人: Wayne Schubert
• 金额: $ 93.23万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0332197&HistoricalAwards=false
• 关键词: Dynamics; Tropical; Troposphere

This project addresses several research topics that are relevant to the dynamics of hurricanes and the intertropical convergence zone (ITCZ). The objectives of the research are to increase the dynamical understanding of these tropical phenomena and to improve the accuracy of numerical simulations of tropical circulations. Recently developed dynamical theories are built upon and extended, and a hierarchy of numerical models will be utilized to achieve the objectives of the research. Previous studies of meso-vortices and rapid surface pressure falls associated with potential vorticity mixing in hurricanes will be extended to three dimensional numerical modeling with better physics equations to provide a more complete analogy to the flow of real hurricanes. Ice effects and microphysical aspects will be studied in the framework of the extended model. This will lead to better understanding of hurricane near-core dynamics. The simulation of the ITCZ and Hadley circulation will be extended to include moist dynamics and will be done at high resolution, because observations of surface winds suggest that vorticity structures within the ITCZ exhibit fine-scale structures. These may affect the undulation and breakdown process of the ITCZ. Another hierarchy of models will be employed to study the large-scale dynamical controls of water vapor in the tropics and subtropics. Observational data from field experiments will be used in conjunction with the theoretical and numerical work.Broader impacts of the development of the theory of moist dynamics will cover a wide range of applications in tropical meteorology. This will eventually lead to improved forecasting of tropical cyclones and of intensity changes of hurricanes. The part of the work related to water vapor fields will lead to improved weather prediction in areas where astronomical equipment is stationed. There will be a considerable impact on graduate student education by giving students access to a hierarchy of numerical models.

该项目介绍了与飓风动力学和受热带收敛区（ITCZ）有关的几个研究主题。 该研究的目标是增加对这些热带现象的动态理解，并提高热带循环的数值模拟的准确性。 最近开发的动力学理论是建立并扩展的，并且将利用数值模型的层次结构来实现研究的目标。 先前对飓风中潜在涡度混合相关的中旋涡流和快速表面压力下降的研究将扩展到具有更好的物理方程的三维数值建模，以提供与真实飓风流的更完整类比。 将在扩展模型的框架中研究冰效应和微物理方面。 这将使人们更好地了解飓风近核动态。 ITCZ和Hadley循环的模拟将扩展到包括潮湿动力学，并将在高分辨率下进行，因为对地面风的观察表明，ITCZ内的涡度结构表现出细尺度结构。 这些可能会影响ITCZ的起伏过程。 将采用另一个模型的层次结构来研究热带和亚热带中水蒸气的大规模动力控制。 来自现场实验的观察数据将与理论和数值工作一起使用。湿动力学理论的发展的影响将涵盖热带气象学中的广泛应用。 这最终将导致对热带气旋的预测和飓风强度变化的预测。 与水蒸气相关的工作的一部分将导致天文设备驻扎的地区的天气预测改善。 通过使学生获得数字模型的层次结构，对研究生教育将产生重大影响。