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鲜为人知的是飓风中的潜在涡度混合过程以及对流尺度产生飓风和中热带收敛区（ITCZ）的潜在涡度的细节。 根据该奖项，舒伯特博士致力于提高动力学理解并提高热带循环的数值模拟的准确性。在飓风中，最近的工作表明，与潜在的涡度混合（例如中层和多边形眼睛）相关的较小，看似无关的现象，它们具有一些共同的特征。 Schubert博士将采用理论和数值模型的层次结构，从非散热的正压模型到采用非凝聚力“全相物理”方程的模型来探索它们。 这项研究的令人兴奋的新方面将在模型中纳入潮湿过程。研究的第二个领域是使用完整的物理模型的版本来探索哈德利循环和ITCZ的各个方面。 特别令人感兴趣的是研究云冰过程在循环中的作用以及模型中使用的云微物理学参数化性质的敏感性。这项研究虽然高度理论并以理想化的模型进行，但对于促进对热带循环的基本动力学的理解至关重要。