The Dynamics of Geostrophic Vortices in the Presence of Nonaxisymmetric Forcing, with Application to the Stratospheric Polar Vortex

非轴对称强迫存在下地转涡旋的动力学及其在平流层极地涡旋中的应用

• 批准号: 8911459
• 负责人: R. Alan Plumb
• 金额: $ 4.16万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911459&HistoricalAwards=false
• 关键词: Dynamics; Geostrophic; Vortices; Presence; Nonaxisymmetric

The co-principal investigators will conduct a study of the dynamics of equivalent barotropic and baroclinic vortices, using a numerical method known as contour dynamics. This method is very attractive for studies of nonlinear processes, especially in terms of reducing computational requirements, but thus far has not been widely applied in atmospheric sciences studies. The motivation for the dynamical investigation is twofold. The practical motivation is the increased awareness of processes such as "breaking" and "filamentation" in the context of geophysical vortices, and particularly in the dynamics of the stratospheric polar vortex. Most of our current rudimentary understanding of such phenomena derives from barotropic models. The theoretical motivation stems from recent studies which show that the dynamics of breaking baroclinic or equivalent barotropic vortices may differ significantly from the barotropic case. The researchers will investigate the implications of these results in contour dynamics models of vortices subjected to forced planetary wave disturbances and thence to assess their significance for our understanding of stratospheric dynamics.

共同主要研究者将对 等效正压和斜压涡旋的动力学， 使用一种称为轮廓动力学的数值方法。 这 方法对于非线性过程的研究是非常有吸引力的， 特别是在减少计算需求方面， 至今尚未广泛应用于大气科学 问题研究 动力学研究的动机是双重的。 实际的动机是提高认识， 过程，如“打破”和“遵守”的背景下， 地球物理学的漩涡，特别是在动力学 平流层极地涡旋 我们目前的大部分 对这种现象的初步了解来自于 正压模式 理论动机源于 最近的研究表明， 斜压或相当的正压涡旋可能不同 与正压情况有很大区别。 研究人员将 研究这些结果在轮廓中的含义 强迫行星波作用下的涡旋动力学模型 干扰，并从那里评估其意义，我们的 理解平流层动力学。