Collaborative Research: Stratospheric Dynamics

该奖项为Polvani博士和麻省理工学院的Plumb博士（ATM-9819092）之间的持续合作提供了支持。他们以前的工作主要集中在大气动力学的各种非线性方面，特别是行星尺度的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的使用-高分辨率二维（单层）模型和三维全球模型-以及流体动力学理论。根据这项合同，主要研究人员将把他们的工作限制在平流层动力学方面。 尽管过去二十年来在这一领域取得了相当大的进展，但仍有几个关键问题没有得到完全解决。 研究的问题是：（1）冬季平流层的季节演变和春季最后变暖的时间是如何依赖于所施加的波浪气候学的;（2）是什么决定了界定中纬度碎波带的副热带“输送障碍”的位置;（3）碎波带和诱导的纬向环流是如何相互作用的;动力系统理论能否为等熵输运过程的定量化提供客观的方法。 主要研究人员将使用理论和几种不同模型的组合来解决这些问题。

This award provides support for a continuing collaboration between Dr. Polvani and Dr. Plumb of MIT (ATM-9819092). 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.