Large Scale Atmospheric Variability from a Quasi-Geostrophic Turbulence Perspective

从准地转湍流角度观察大尺度大气变化

• 批准号: 0132727
• 负责人: Timothy Dunkerton
• 金额: $ 24.9万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-01 至 2006-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0132727&HistoricalAwards=false
• 关键词: Large; Scale; Atmospheric; Variability; Quasi

The project will investigate the extent to which variability of the large-scale atmosphere is controlled by variations at the smaller synoptic scales. The upscale energy flux from the synoptic waves is reckoned to be an important contributor in generating variations at the larger scales. It is, of course, by no means the only contributor since instability of the zonal flow, variations in tropical diabatic heating, and planetary wave-zonal flow interactions can also generate significant planetary-scale variability in the troposphere on the intraseasonal-to seasonal time scales. Modeling and prediction of this variability component remains challenging. Drs. Orlando and, co-PI, Dr. Tung (Univ. of Washington, Seattle) will conduct a dynamically oriented analysis of the interaction of upscale synoptic fluxes and the larger-scale tropospheric circulation. The focus of the project will be on characterizing the upscale synoptic fluxes from modeling experiments of varying complexity. The project will advance understanding and modeling of the tropospheric circulation variability on intraseasonal-to-seasonal time scales, particularly, during the Northern winter season.

该项目将调查大尺度大气的可变性在多大程度上受到较小天气尺度的变化的控制。来自天气波的高尺度能量通量被认为是产生大尺度变化的重要因素。当然，它绝不是唯一的贡献者，因为纬向流的不稳定、热带非绝热加热的变化以及行星波-纬向流的相互作用也可以在季节内到季节的时间尺度上在对流层中产生显著的行星尺度变化。对这一变异性组成部分的建模和预测仍然具有挑战性。奥兰多博士和共同派董博士(大学)将对高尺度天气通量和更大尺度对流层环流的相互作用进行动态定向分析。该项目的重点将是从不同复杂性的模拟试验中确定高级天气通量的特征。该项目将促进对对流层环流变化在季节间时间尺度上的理解和建模，特别是在北方冬季。