Dynamics of Low-Frequency Modes of the Atmospheric Circulation

0424799：“大气环流低频模式的动力学“金飞飞，阿尔伯特I。Barcilon和Ming Cai，佛罗里达州立大学.摘要本项目将探索天气尺度瞬变与低频行星尺度气流异常之间的相互作用，如北大西洋涛动、北极涛动、南极涛动和太平洋北美异常。这涉及到一套方程的缓慢变化的流动和异常叠加在它上面，并包括一个封闭的方案的漩涡。一系列动力学模式，包括准地转模式和原始方程模式，以及再分析数据集，将用于系统地研究拟议的天气学涡旋和低频气流反馈以及低频模式的动力学。在这一反馈机制的动力学闭合成功的基础上，将研究大气对海表面温度异常的反应，以及热带外大气-海洋相互作用在低频模式，特别是北大西洋涛动持续性中的作用，大气的低频变率对公民的日常生活和企业、公司、和生态系统，预计该项目将使所有这些社区受益。为一名博士后助理提供支助。

0424799: "Dynamics of Low-Frequency Modes of the Atmospheric Circulation"Fei-Fei Jin, Albert I. Barcilon, and Ming Cai, Florida State University.AbstractThis project will explore the interaction between synoptic scale transients and lower-frequency planetary scale flow anomalies, such as the North Atlantic Oscillation, Arctic Oscillation, Antarctic Oscillation, and Pacific North American anomaly. This involves sets of equations for the slowly varying flow and the anomalies superimposed upon it, and includes a closure scheme for the eddies. A hierarchy of dynamical models, including quasi-geostrophic and primitive equation models, together with reanalysis data sets, will be used to systematically study the proposed synoptic eddy and low-frequency flow feedback and the dynamics of the low frequency modes. Building upon the success of the dynamical closures of this feedback mechanism, the atmospheric response to the sea surface temperature anomalies, and the role of extratropical air-sea interaction in the persistence of the low frequency modes, particularly the North Atlantic Oscillation, will be studied.The low-frequency variability of the atmosphere has important consequences for the everyday life of citizens and the fate of businesses, corporations, and ecosystems, and this project is expected to benefit all these communities. Support is provided for one post-doctoral associate.