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。罗宾逊博士使用了高度理想化的大气模型，在这种情况下，球体上的单层正压模型使他能够分离和研究大气的基本过程。在他之前的奖项中，罗宾逊博士和他的学生开发了一个新版本的正压模型，该模型包含了大气涡旋随尺度变化的垂直结构的信息。该模型现在将通过对低频率变化的事件进行后播来进行测试。将使用几种不同的方法来检查该模型的动力学。通过强迫模式观测到的瞬变涡位涡通量，可以诊断瞬变涡强迫对低频变率的作用。罗宾逊博士希望证明，有了垂直结构的涡流信息，简单的模型将在数量上与观测结果一致，从而提供信心，即通过理想化的模型获得的概念性见解与真实大气有关。

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.