Dynamics of Tropical Cyclones and the Hadley Circulation

热带气旋和哈德利环流的动力学

• 批准号: 0087072
• 负责人: Wayne Schubert
• 金额: $ 43.2万
• 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: 2000
• 资助国家: 美国
• 起止时间: 2000-12-01 至 2003-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0087072&HistoricalAwards=false
• 关键词: Dynamics; Tropical; Cyclones; Hadley; Circulation

Several aspects of tropical dynamics that are still poorly understood are the potential vorticity mixing processes in hurricanes and the details of the convective-scale generation of potential vorticity in both hurricanes and the Intertropical Convergence Zone (ITCZ). Under this award, Dr. Schubert seeks to increase dynamical understanding and to improve the accuracy of numerical simulations of tropical circulations. Within hurricanes, recent work has shown that there are smaller-scale, seemingly unrelated, phenomena associated with potential vorticity mixing such as mesovortices and polygonal eyewalls which have some common characteristics. Dr. Schubert will employ a hierarchy of theoretical and numerical models, from a nondivergent barotropic model to one that employs the nonhydrostatic, "full-physics" equations to explore them. The exciting new aspect of this study will be the incorporation of moist processes in the models. A second area of investigation is to use a version of the full physics model to explore aspects of the Hadley circulation and the ITCZ. Of particular interest is the study of the role of cloud ice processes in the circulations and the sensitivity to the nature of the cloud microphysics parameterizations employed in the models. This research, while highly theoretical and conducted with idealized models, is critical to advance the understanding of the basic dynamics of tropical circulations.

热带动力学的几个方面仍然知之甚少，如飓风中的位涡混合过程以及飓风和热带辐合带（ITCZ）中位涡对流尺度产生的细节。在这个奖项下，舒伯特博士寻求增加对动力学的理解，并提高热带环流数值模拟的准确性。在飓风内部，最近的研究表明，有一些规模较小、看似无关的现象与潜在涡度混合有关，如中涡旋和多边形眼壁，它们有一些共同的特征。舒伯特博士将采用一系列理论和数值模型，从非发散正压模型到采用非流体静力学的“全物理”方程来探索它们。这项研究令人兴奋的新方面将是在模型中纳入潮湿过程。第二个研究领域是使用全物理模型的一个版本来探索哈德利环流和ITCZ的各个方面。特别令人感兴趣的是研究云冰过程在环流中的作用以及对模式中使用的云微物理参数化性质的敏感性。这项研究虽然是高度理论化的，而且是用理想化的模式进行的，但对促进对热带环流基本动力学的理解至关重要。