Influence of Potential Vorticity Distributions on Rossby Wave Propagation in the Troposphere and Stratosphere

这个项目旨在提高我们对实际复杂大气流动中的线性和非线性行星尺度波动，包括波的传播和破裂的基本理解。将特别注意平流层极地涡旋，那里的化学和动力过程可导致臭氧总量的急剧减少，而且据信它在气候趋势和地面天气模式的短期可预测性方面也发挥了作用。我们将考察两个涉及Rossby波动的互补范例，在这两个范例中，各自的基本态包括位涡的光滑或不连续分布。传统上，尽管冬季平流层中的位涡分布倾向于形成几乎不连续的阶梯状结构，但前者受到了更多的关注。在这项研究中，将检查数值模式中的梯度，并将探索此类模式中水平和垂直分辨率的理想配置。

This project aims to improve our fundamental understanding of linear and non-linear planetary scale wave motions, including wave propagation and breaking, in realistically complex atmospheric flows. Particular attention will be paid to the stratospheric polar vortex, where chemical and dynamical processes can lead to severe reductions in the total ozone column, and which is also believed to play a role in both climate trends and in shorter term predictability of surface weather patterns. Two complementary paradigms involving Rossby wave motion will be examined in which respective basic states comprise either smooth or discontinuous distributions of the potential vorticity. Traditionally, the former paradigm has received more attention, despite the fact that potential vorticity distributions in the winter stratosphere tend to form almost discontinuous, step-like structures. In this study, gradients will be examined in numerical models and the ideal configuration of horizontal and vertical resolution in such models will be explored.