Theoretical Studies of Unbalanced Motions and Nonlinear Hadley Circulations in the Atmosphere

大气中不平衡运动和非线性哈德利环流的理论研究

• 批准号: 0227632
• 负责人: Timothy Dunkerton
• 金额: --
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-02-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0227632&HistoricalAwards=false
• 关键词: Theoretical; Studies; Unbalanced; Motions; Nonlinear

The project will investigate aspects of unbalanced dynamics relevant to the tropical and extratropical atmosphere. Unbalanced motions, by definition, result when the balance between major geophysical forces (e.g., the pressure-gradient and Coriolis forces) is perturbed. The adjustment, or reestablishment of equilibrium, is accompanied by transient motions and/or wave propagation, such as gravity waves, inertial instability, etc. Dr. Dunkerton (Northwest Research Associates, Bellevue, Washington) will extend the analysis of inertial adjustment (resulting in zero potential vorticity in the adjusted region) from axisymmetric 2D flow configurations to non-symmetric 3D flows perturbed by Rossby waves in the winter hemisphere. Dr. Dunkerton will also investigate the triggering of deep moist tropical convection by gravity waves and other transient motions that are excited in the balance-restoring processes. The role of SST gradients and curvature in forcing the tropical Hadley circulation will also be analyzed. The project will advance our understanding of fundamental dynamical processes operative in atmosphere, and contribute to improved modeling of dynamical interactions between the hemispheres, triggering of deep convection, and ocean-atmosphere coupling (via the Hadley circulation).

该项目将调查与热带和热带外大气有关的不平衡动力学的各个方面。 根据定义，不平衡运动是在主要地球物理力（例如，压力梯度和科里奥利力）受到扰动。 平衡的调整或重建伴随着瞬时运动和/或波传播，例如重力波、惯性不稳定性等。Dunkerton博士（西北研究协会，贝尔维尤，华盛顿）将扩展惯性调整的分析（导致调整区域中的零位涡）从轴对称2D流配置到非冬季半球Rossby波扰动的对称三维流动。 Dunkerton博士还将研究重力波和在平衡恢复过程中激发的其他瞬态运动对深层潮湿热带对流的触发。 还将分析SST梯度和曲率在强迫热带哈德利环流中的作用。 该项目将促进我们对大气中基本动力过程的理解，并有助于改进半球之间动力相互作用的建模，触发深对流和海洋-大气耦合（通过哈德利环流）。