Low-frequency Variability in the Extratropical Atmosphere

该奖项为继续研究中纬度大气季节内变化的动力学提供了支持。 罗宾逊博士采用了高度理想化的大气模型，在这种情况下，一个单一的水平正压模型的一个领域，这使他能够隔离和研究的基本过程的大气。 根据他以前的奖项，罗宾逊博士和他的学生开发了一个新版本的正压模型，其中包括有关尺度依赖的大气涡旋垂直结构的信息。 该模型现在将通过对低频变异性事件进行后报来进行测试。 该模型的动态将使用几种不同的方法进行检查。 瞬态涡动强迫对低频变率的作用将通过用观测到的瞬态涡动位涡通量强迫模式来诊断。 罗宾逊博士希望证明，通过垂直结构涡动信息，简单模型将与观测结果在数量上一致，从而使人们相信，通过理想化模型获得的概念性见解与真实的大气有关。

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.