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

急流条纹是嵌在对流层上层更广泛的快速移动急流中的小区域加速气流，与快速的气旋形成、强降水和强对流风暴有关；因此，它们对天气预报具有重要意义。首席研究员Keyser博士将探索喷流条纹的本质，通过观察和诊断分析来观察它们的三维结构，并采用几种模型——准地转和原始方程通道模型。他假设，极锋急流通常是由次天气尺度的高层单极或偶极涡旋叠加在大尺度急流上造成的。旋涡“诱导”出喷流条纹。调查将集中在喷流条纹的三维结构，以及相关的旋转和发散的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.