Low Frequency Variability in the Extratropical Atmosphere

温带大气中的低频变化

• 批准号: 9628850
• 负责人: Walter Robinson
• 金额: $ 18.85万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628850&HistoricalAwards=false
• 关键词: Low; Frequency; Variability; Extratropical; Atmosphere

9628850 Robinson This award provides support for Dr. Robinson's continuing research on the low frequency variability of the extratropical atmosphere and employs a mix of observational analyses, analyses of general circulation model output, and simple numerical models. The principal investigator will focus on three tasks. The first is the development and application of a generalized barotropic model to be used for diagnostic and process studies of low frequency variability, both observed and in general circulation models (GCMs). This is a new undertaking by the PI and involves a new, creative approach that employs the PI's empirically derived formulation of the relationship between potential vorticity and the streamfunction. The other two tasks represent continuations of previously supported work. One is a series of diagnostic studies of the dynamics governing the zonal index in GCM output and in observations, and of the predictability of the zonal index. The other major area involves analytical studies of the nonlinear behavior of the barotropic instability of zonally asymmetric basic states which is believed to contribute to the low frequency variability in the atmosphere. All of these studies are important for advancing understanding of atmospheric dynamic processes that are critical to improved extended range prediction. ***

9628850罗宾逊 该奖项为罗宾逊博士继续研究对流层外大气的低频变率提供了支持，并采用了观测分析、大气环流模式输出分析和简单数值模式的混合。 首席研究员将专注于三项任务。 第一个是发展和应用一个广义正压模式，用于对观测到的和大气环流模式中的低频变率进行诊断和过程研究。 这是PI的一项新任务，涉及一种新的创造性方法，采用PI的经验推导出的位涡和流函数之间的关系公式。 另外两个任务是以前支持的工作的延续。 一个是一系列的诊断研究的动力学管理的纬向指数在GCM输出和观测，以及纬向指数的可预测性。 另一个主要领域是分析研究纬向非对称基本状态的正压不稳定性的非线性行为，据信这有助于大气中的低频变率。 所有这些研究对于推进对大气动力过程的理解都很重要，而大气动力过程对改进扩展范围预测至关重要。 ***