Observational and Modeling Studies of the Structure and Dynamics of Jet Streaks

急流条纹是嵌入对流层上层快速移动急流中的小面积加速气流，与快速气旋生成、强降水和强对流风暴有关;因此，它是天气预报的主要兴趣。 首席研究员凯瑟博士将探索急流条纹的性质，利用观测和诊断分析并采用几种模型-准地转和原始方程通道模型-来观察它们的三维结构。 他假设极锋急流通常是由上层次天气尺度的单极或偶极涡旋叠加在大尺度急流上而产生的。 涡流“诱发”射流条纹。 调查将集中于急流条纹的三维结构，沿着与之相关的旋转和发散的非地转环流和垂直运动。

Jet streaks, small areas of accelerated flow embedded in the broader rapidly moving jet streams of the upper troposphere, are associated with rapid cyclogenesis, heavy precipitation, and severe convective storms; hence, are of major interest for weather forecasting. The principal investigator, Dr. Keyser, will explore the nature of jet streaks, looking at their three-dimensional structure using observational and diagnostic analyses and employing several models - a quasi-geostrophic and primitive equation channel models. He hypothesizes that polar-front jets often result from the superposition of upper level monopolar or dipolar vortices of sub-synoptic dimensions on the large-scale jet stream. The vortices "induce" jet streaks. The investigation will focus on the three-dimensional structure of the jet streaks, along with the associated rotational and divergent ageostrophic circulations and vertical motions.