Collaborative Research: Nonlinear Atmospheric Wave and Vortex Dynamics

9528471 Plumb这个项目代表了麻省理工学院的Alan Plumb博士(根据该奖项)和哥伦比亚大学的Lorenzo Polvani博士(ATM-9527315)在非线性大气波和涡旋的动力学方面的持续合作，特别是在平流层的应用方面。在这项工作中，使用了许多工具。首先，利用等高线动力学技术在很高的分辨率下研究了Rossby波在各种情况下的破裂特征。然后，主要研究人员使用全球伪谱浅水模型来研究在存在非保守过程的情况下非线性波的二维动力学以及“等高线平流”技术(一种拉格朗日、高分辨率、等高线跟踪方法来描述已知流动中的输送)。为了推广这些结果，PIS将使用多层伪谱原始方程模式来研究Rossby波与平流层极涡之间相互作用的三维方面。他们还将研究与Rossby波动力学有关的对流层环流的各个方面--包括大气阻塞以及Hadley环流和中纬度行星波之间的相互作用。***

9528471 Plumb This project represents an ongoing collaboration between Drs. Alan Plumb of MIT (under this award) and Dr. Lorenzo Polvani of Columbia University (ATM-9527315) concerning the dynamics of nonlinear atmospheric waves and vortices, with particular emphasis on applications to the stratosphere. In this work, a number of tools have been employed. Initially, the techniques of contour dynamics was used to study, at very high resolution, the characteristics of Rossby wave breaking under a variety of circumstances. The principal investigators then used a global, pseudospectral, shallow water model to look at the two-dimensional dynamics of nonlinear waves in the presence of nonconservative processes as well as a "contour advection" technique (a Lagrangian, high resolution, contour-following approach to depict transport in known flows. To extend these results, the PIs will examine the three-dimensional aspects of the interaction between Rossby waves and the stratospheric polar vortex using a multi-layer, pseudospectral, primitive equation model. They also will investigate various aspects of the tropospheric circulation related to Rossby wave dynamics - including atmospheric blocking and interactions between the Hadley circulation and midlatitude planetary waves. ***