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.

该项目涉及与飓风动力学和热带辐合带（ITCZ）有关的几个研究课题。 研究的目的是增加对这些热带现象的动力学理解，并提高热带环流数值模拟的准确性。 最近开发的动力学理论的基础上，并扩展，和层次的数值模型将被用来实现研究的目标。 先前对与飓风中位涡混合相关的中尺度涡旋和快速表面压力福尔斯下降的研究将扩展到具有更好物理方程的三维数值模拟，以提供与真实的飓风流动的更完整的类比。 冰的影响和微物理方面将在扩展模式的框架内进行研究。 这将有助于更好地了解飓风近核动力学。 ITCZ和Hadley环流的模拟将扩大到包括湿动力学，并将以高分辨率进行，因为对地面风的观测表明，ITCZ内的涡度结构显示出细尺度结构。 这可能会影响ITCZ的波动和崩溃过程。 另一个层次的模式将被用来研究在热带和亚热带水汽的大尺度动力控制。 将结合理论和数值工作使用实地实验的观测数据，湿动力学理论发展的更广泛影响将包括热带气象学的广泛应用。 这将最终导致改进对热带气旋和飓风强度变化的预报。 与水汽场有关的部分工作将改善天文设备所在地区的天气预报。 这将对研究生教育产生相当大的影响，使学生能够接触到一个层次的数值模型。