Collaborative Research: Stratospheric Dynamics

该奖项为普拉姆博士和波尔瓦尼博士在哥伦比亚大学(ATM-9818656)的持续合作提供支持。他们以前的工作集中在大气动力学的各种非线性方面，特别是但不仅是行星尺度的Rossby波，以及它们与背景环流的相互作用。这些研究在很大程度上依赖于模型和流体动力学理论的使用--既有高分辨率的二维(单层)模型，也有三维的全球模型。根据这项裁决，主要调查人员将把他们的工作限制在平流层动力学方面。尽管过去二十年在这一领域取得了长足进展，但仍有几个关键问题没有得到完全解答。要研究的问题是：(1)冬季平流层的季节演变和春季最终变暖的时间如何取决于施加的波气候学；(2)是什么决定了中纬度海浪带边界的副热带“输送障碍”的位置；(3)海浪带和诱发的经向环流如何相互作用；(4)动力系统理论能否为等熵输送过程的量化提供一个客观的方法。主要研究人员将结合理论和几种不同的模型来解决这些问题。

This award provides support for a continuing collaboration between Dr. Plumb and Dr. Polvani at Columbia University (ATM-9818656). Their previous work was focused on various nonlinear aspects of atmospheric dynamics, especially, but not only, of planetary scale Rossby wave, and their interaction with the background circulation. Those studies relied heavily on the use of models - both high-resolution two-dimensional (one-layer) models and three-dimensional, global models - and fluid dynamics theory. Under this award the principal investigators will restrict their work to stratospheric dynamics. Despite considerable progress in this area over the past two decades, several key issues remained incompletely answered. The issues to be investigated are: (1) how the seasonal evolution of the winter stratosphere and the timing of the springtime final warming depend on the imposed wave climatology; (2) what determines the location of the subtropical "transport barrier", bounding the midlatitude surf zone; (3) how the surf zone and the induced meridional circulation interact; and (4) whether dynamical systems theory can offer an objective approach to the quantification of isentropic transport processes. The principal investigators will tackle these problems using a combination of theory and several different models.