Stratosphere-troposphere Coupling during Anticyclogenesis

该项目试图了解对流层阻塞事件如何导致平流层突然变暖(SSW)。以前的研究已经表明了统计上显著的关系，其中大多数SSW在阻塞事件之前，而大多数阻塞事件不在SSW之后。这项研究的目的是确定是什么因素导致一些地块扰动平流层，而另一些地块则不会。这项研究是通过再分析数据集的动力诊断和使用理想大气模式进行的数值试验相结合的方式进行的。研究课题具有实际意义和科学意义，因为SSW已知会影响后续天气，尤其与冷空气爆发有关。因此，这项研究的结果可能对长期天气预报有意义。此外，该项目还支持两名研究生，从而为这一领域的下一代研究人员提供了条件。

This project seeks to understand how tropospheric blocking events lead to stratospheric sudden stratospheric warmings (SSWs). Previous research has shown a statistically significant relationship in which most SSWs are preceded by blocking events, yet the majority of blocking events are not followed SSWs. The goal of this research is to determine what factors cause some blocks to perturb the stratosphere while others do not. The research is conducted through a combination of dynamical diagnosis of reanalysis datasets and numerical experiments conducted with an idealized atmospheric model.The research topic is of practical importance as well as scientific interest, as SSWs are known to affect subsequent weather and are particularly associated with cold air outbreaks. Results of this research may thus be of interest for long-range weather forecasting. In addition, the project supports two graduate students, thereby providing for the next generation of researchers in this area.