Time Evolution of Baroclinic Wave Activity in Stormtracks and Its Relationship with Jetstream Structure

在北方半球的冬季， 在两个相距甚远的 中纬度风暴轨道，沿着亚洲东海岸和 美国的 有证据表明，波动的变化 (or风暴）活动和风暴轨迹的位置是 与基本流的低频可变性有关， 它们被嵌入。 此外，波浪似乎影响了 基本流型的演变。 虽然有很多证据表明， 在平均意义上收集，仍然需要 了解相互作用的时间演化。 本研究的目的是调查 天气尺度波和主要风暴路径沿着的演变 并将其与基本流中的低频变化相关联， 特别是急流的结构。 该研究采用了 30-年数据集。 这项研究对以下方面具有重要意义： 改进中长期天气预报。 如果时间允许，PI还将检查 在非洲上空的低空东风急流和所谓的 东风波或非洲波。

In the Northern Hemisphere winter, most of the synoptic scale storm activity is observed in two widely-separated midlatitude stormtracks, along the east coasts of Asia and the United States. There is evidence that the variability in wave (or storm) activity and the position of the stormtrack are related to low frequency variability of the basic flow in which they are embedded. Further, it appears that the waves influence the evolution of the basic flow pattern. While much evidence has been gathered in an averaged sense, there is still a need to understand the time evolution of the interactions. The purpose of this research is to investigate the time evolution of synoptic scale waves and along the major stormtracks and to relate it to low-frequency changes in the basic flow, specifically the structure of the jetstream. The study employs a 30-year data set. This research has important implications for improving medium and long range weather forecasting. If time permits, the PIs will also examine the relationship between the low-level easterly jet over Africa and the so-called easterly or African waves.