Persistent Flow Anomalies, Blocking and Variations in Synoptic-Scale Eddy Activity. Theoretical and Diagnostic Studies

天气尺度涡流活动的持续流动异常、阻塞和变化。

• 批准号: 8820938
• 负责人: Paola Rizzoli
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-02-15 至 1992-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8820938&HistoricalAwards=false
• 关键词: Persistent; Flow; Anomalies; Blocking; Variations

The primary goal of this research is to obtain an improved understanding of the mechanisms that determine the evolution of large-scale flow anomalies such as blocking. A second major goal is to determine how the large-scale flow anomalies may influence (and be influenced by) synoptic-scale eddies. In order to achieve these goals, a combination of approaches will be employed to study the variations in synoptic-scale eddy activity and the roles of various dynamical and physical processes during different stages in the evolution of the large-scale flow anomalies. Specific objectives of the proposed studies include: applying synoptic and diagnostic approaches to analyze and compare numerical simulations of low-frequency variability in the NCAR Community Climate Model with corresponding observational results, with particular emphasis given to assessing the adequacy of model simulation of the structures and life cycles of persistent anomalies and blocking. Diagnostic analyses will also be employed to examine the relationships (in both the model and observations) between the large-scale flow anomalies and changes in synoptic-scale eddy activity at various stages in the evolution of the large-scale flow patterns (i.e., during the development, mature and breakdown stages). In addition, extensions to current analytical and theoretical models of blocking will be developed, concentrating particularly on the coherent structure models of Malguzzi and Malanotte-Rizzoli (1984) and Haines and Marshall (1987). These models will be employed to further examine the roles played by various dynamical and physical processes in the initiation, persistence and breakdown of the anomalous large-scale flow patterns. This work will enhance our capability to make seasonal forecasts.

这项研究的主要目标是对确定大规模流动异常（例如阻塞）演变的机制有了深入的了解。第二个主要目标是确定大规模流动异常可能如何影响（并受到天气尺度涡流的影响）。 为了实现这些目标，将采用多种方法来研究天气尺度活动的变化，以及在不同阶段在大规模流动异常演变中各种动力学和物理过程的作用。 拟议研究的特定目的包括：应用概念和诊断方法分析和比较NCAR社区气候模型中低频可变性的数值模拟，并具有相应的观察结果，特别强调了评估模型模型和生命周期的模型仿真的足够性。 还将采用诊断分析来检查大尺度流动异常之间的关系（在模型和观察中）与概要尺度涡流活性在各个阶段的变化（在大规模流动模式的演变中）（即在开发，成熟和崩溃阶段）的演变中。 此外，将开发对当前分析和理论模型的扩展，特别集中在Malguzzi和Malanotte-Rizzoli（1984）和Haines和Marshall（1987）的连贯结构模型上。 这些模型将用于进一步研究各种动态和物理过程在异常大规模流动模式的启动，持久性和分解中所扮演的角色。 这项工作将增强我们进行季节性预测的能力。