New Methods In Storm Track Dynamics Theory

风暴轨迹动力学理论的新方法

• 批准号: 0123389
• 负责人: Brian Farrell
• 金额: $ 36.25万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-12-01 至 2004-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0123389&HistoricalAwards=false
• 关键词: New; Methods; Storm; Track; Dynamics

Atmospheric flows such as mid-latitude jets are, in general, time-dependent so that a comprehensive stability theory for these systems must address the influence of temporal variation in the background flow on the growth and structure of perturbations. Another important application of time-dependent instability theory is in relation to the growth of initial errors in tangent linear models. In this project, the PI plans to pursue further the non-modal stability theory he and his group developed for time-varying flows to study deterministic stability problems related to the origin and maintenance of upper level short waves. In addition, the PI will investigate the statistical mean structure and dynamics of synoptic scale variance through stochastic forcing. The project has the potential of obtaining new insight into linear instability with time-varying flows that may provide new understanding for mid-latitude synoptic weather phenomena such as storm tracks.

一般来说，诸如中纬度急流之类的大气流是时变的，因此这些系统的综合稳定性理论必须解决背景流的时间变化对扰动的增长和结构的影响。时变不稳定性理论的另一个重要应用是与切线线性模型中初始误差的增长有关。在这个项目中，PI计划进一步研究他和他的团队为时变流动开发的非模态稳定性理论，以研究与上层短波的起源和维持有关的确定性稳定性问题。此外，PI将通过随机强迫研究天气尺度方差的统计平均结构和动力学。该项目有可能获得对时变气流线性不稳定性的新见解，这可能为中纬度天气天气现象（如风暴路径）提供新的理解。