Low-frequency Variability in the Extratropical Atmosphere

温带大气中的低频变化

• 批准号: 0002724
• 负责人: Walter Robinson
• 金额: $ 6.32万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0002724&HistoricalAwards=false
• 关键词: Low; frequency; Variability; Extratropical; Atmosphere

This award provides support for continued research into the dynamics of intraseasonal variability of the midlatitude atmosphere. Dr. Robinson employs highly idealized models of the atmosphere, in this case a single level barotropic model on a sphere, which allow him to isolate and study fundamental processes of the atmosphere. Under his previous award, Dr. Robinson and his student developed a new version of the barotropic model that incorporates information about the scale-dependent vertical structure of atmospheric eddies. The model now will be tested by doing hindcasts of episodes of low frequency variability. The dynamics of the model will be examined using several different approaches. The role of transient-eddy forcing for low frequency variability will be diagnosed by forcing the model with observed transient-eddy potential vorticity fluxes. Dr. Robinson hopes to demonstrate that, with the vertical structure eddy information, the simple model will agree quantitatively with observations, thus providing confidence that the conceptual insights gained with the idealized model are relevant to the real atmosphere.

该奖项为继续研究中纬度大气季节内变化的动态提供了支持。 罗宾逊博士采用高度理想化的大气模型，在本例中是球体上的单级正压模型，这使他能够分离和研究大气的基本过程。 罗宾逊博士和他的学生在之前的奖项中开发了一种新版本的正压模型，其中包含有关大气涡流与尺度相关的垂直结构的信息。 现在将通过低频变异事件的后播来测试该模型。 将使用几种不同的方法来检查模型的动力学。 瞬变涡流强迫对低频变化的作用将通过用观测到的瞬变涡流位涡通量对模型进行强制来诊断。 罗宾逊博士希望证明，利用垂直结构涡流信息，简单模型将在数量上与观测结果一致，从而使人们相信通过理想化模型获得的概念见解与真实大气相关。