Dynamics of Low-Frequency Modes of the Atmospheric Circulation

0424799：“大气环流的低频模态动力学”，金飞飞，Albert I. Barcilon，蔡明，佛罗里达州立大学。摘要本项目将探讨天气尺度瞬变与低频行星尺度流异常（如北大西洋涛动、北极涛动、南极涛动和太平洋北美异常）之间的相互作用。这涉及到缓慢变化的流动和叠加在其上的异常的一组方程，并包括涡流的封闭方案。本文将利用拟地转和原始方程等动力学模型，结合再分析数据集，系统地研究天气涡旋和低频流反馈以及低频模态的动力学。在此反馈机制动力学闭合成功的基础上，将研究大气对海表温度异常的响应，以及温带海气相互作用在低频模态（特别是北大西洋涛动）持续中的作用。大气的低频变化对公民的日常生活以及商业、公司和生态系统的命运有着重要的影响，该项目有望使所有这些社区受益。资助博士后1名。

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.