Collaborative Research: Stratospheric Dynamics

合作研究：平流层动力学

• 批准号: 9818656
• 负责人: Lorenzo Polvani
• 金额: $ 29.06万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-03-15 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9818656&HistoricalAwards=false
• 关键词: Collaborative; Research; Stratospheric; Dynamics

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.

该奖项为麻省理工学院的Polvani博士和Plumb博士之间的持续合作提供了支持（ATM-9819092）。他们以前的工作集中在大气动力学的各种非线性方面，特别是但不仅限于行星尺度的罗斯比波，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——既有高分辨率的二维（单层）模型，也有三维的全局模型——以及流体动力学理论。在这个奖项下，主要研究人员将把他们的工作限制在平流层动力学。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终变暖的时间如何取决于强加波气候学；(2)是什么决定了包围中纬度冲浪带的亚热带“运输屏障”的位置；(3)海面带与诱导经向环流如何相互作用；(4)动力系统理论能否为等熵输运过程的量化提供客观的方法。主要研究人员将结合理论和几个不同的模型来解决这些问题。