The Dynamics of Upper-Level Mobile Troughs

9521383尼尔森-伽蒙该奖项支持对高层大气槽或短波动力学的研究。这些低谷触发了大多数温带气旋发生，但这些短波的来源尚不清楚。主要目的是确定高空移动槽形成的典型机制(S)，了解这些槽与高地形相互作用的本质，探索温带气旋在创造有利于短波增长和传播的位涡分布中的作用，以及这种场对气旋发展的影响。首席研究人员将采用一种称为分段位涡反演的诊断技术。对高层低谷及其在温带气旋发生中的作用的了解的进展将对改进天气预报和气候模拟大有裨益。***

9521383 Nielson-Gammon This award supports investigations of the dynamics of upper atmospheric troughs or short waves. These troughs trigger most extratropical cyclogenesis, but the source for these short waves is not well understood. The primary objectives are to determine the typical mechanism(s) of formation of upper-level mobile troughs, to understand the nature of the interaction between these troughs and high terrain, to explore the role of extratropical cyclones in creating a distribution of potential vorticity that is conducive to the growth and propagation of short-waves and the effect of such fields on the cyclone development. The principal investigator will employ a diagnostic technique known as piecewise potential vorticity inversion. Advances in the understanding of upper-level troughs and their role in extratropical cyclogenesis would be of considerable benefit to the improvement of weather forecasting and climate simulations. ***