The Dynamics of Equatorial Atmospheric Angular Momentum

赤道大气角动量的动力学

• 批准号: 0224870
• 负责人: Steven Feldstein
• 金额: $ 14.66万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-11-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0224870&HistoricalAwards=false
• 关键词: Dynamics; Equatorial; Atmospheric; Angular; Momentum

The project will investigate the dynamical processes that generate intraseasonal variability in the equatorial components of the atmospheric angular momentum. These components of the 3D angular momentum vector are orthogonal to its axial component, which has been intensely studied in the past because of its association with variations in the zonal-mean zonal wind. The equatorial components, on the other hand, are related to planetary-scale atmospheric wave variability (including, potentially, the Madden-Julian oscillation), and are consequential for polar motion. Dr. Feldstein will conduct a dynamically oriented diagnosis of the mechanisms generating intraseasonal variability in equatorial angular momentum. He will analyze long-term integrations of atmospheric general circulation model (albeit with an idealized lower boundary condition) and a record of reanalyzed atmospheric observations (produced by the National Centers for Environmental Prediction) to shed light on the evolution of this variability. The project will advance the understanding of atmospheric angular momentum variability, and contribute to improvements in prediction skill of the medium and longer-range weather forecasts.

该项目将研究产生大气角动量赤道分量季节内变化的动力学过程。 3D 角动量矢量的这些分量与其轴向分量正交，由于其与纬向平均纬向风的变化相关，因此过去对其进行了深入研究。另一方面，赤道分量与行星尺度的大气波变化（包括可能的马登-朱利安振荡）有关，并且对极移有影响。费尔德斯坦博士将对产生赤道角动量季节内变化的机制进行动态定向诊断。他将分析大气环流模型的长期整合（尽管具有理想化的下边界条件）和重新分析的大气观测记录（由国家环境预测中心制作），以揭示这种变化的演变。该项目将增进对大气角动量变化的理解，并有助于提高中长期天气预报的预测技能。