The Dynamics of Zonal Jets and Low-Frequency Variability

纬向射流动力学和低频变率

• 批准号: 9712834
• 负责人: Steven Feldstein
• 金额: $ 26.22万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-12-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9712834&HistoricalAwards=false
• 关键词: Dynamics; Zonal; Jets; Low; Frequency

9712834 Feldstein This award provides renewed support for continued investigations into the nature of zonal-mean flow variability, regional low-frequency variability, and multiple zonal jet dynamics. In their studies, the principal investigators will employ a hierarchy of models, ranging from simple barotropic to multi-level primitive equation, as well as the NCEP/NCAR reanalysis data sets. This combined approach of idealized models and observational data is likely to provide important insights into the dynamical processes they seek to understand. Among the questions that will be explored are: the role of the barotropic processes in the suppression of eddy feedback for the zonal index (the zonal index being represented by the latitudinal displacement of the jet maximum), whether the prominent regional low-frequency anomalies are dominated by linear processes, the source for low-frequency variability of atmospheric flows, and whether stochastic processes are responsible for the inter-jet disturbances in cases of multiple-jet flows. While of considerable theoretical interest, this research ultimately will have practical application in the improvement of extended range forecasting.

小行星9712834 该奖项提供了新的支持，继续调查的性质，纬向平均流的变化，区域低频变化，和多个纬向急流动力学。 在他们的研究中，主要研究人员将采用一系列模式，从简单的正压到多层原始方程，以及NCEP/NCAR再分析数据集。 这种理想化模型和观测数据相结合的方法可能会为他们试图理解的动力学过程提供重要的见解。 将探讨的问题包括：正压过程在抑制纬向指数涡动反馈中的作用（纬向指数由急流最大值的纬向位移表示），显著的区域低频异常是否受线性过程控制，大气流动低频变率的来源，以及随机过程是否是多喷流情况下喷流间扰动的原因。 虽然相当大的理论兴趣，这项研究最终将有实际应用中的扩展范围预测的改进。