Nonlinear Atmospheric Wave and Vortex Dynamics

该奖项是麻省理工学院的Alan Plumb博士和哥伦比亚大学的Lorenzo Polvani博士（ATM-9217844）合作项目的两个独立奖项之一。他们的研究包括模拟和理解大气中大尺度波浪和涡流运动的非线性方面，使用轮廓动力学与外科手术（CD/S）技术。这是一种高效的计算程序，可用于研究高分辨率的过程，如高度非线性流动中的谱级联熵。pi计划应用该技术进一步研究平流层极涡的动力学、准平稳长波的相互作用以及位涡梯度集中而非连续的ross - by波频散关系。此外，他们还开发了一种轮廓平流手术技术（CA/S），其中CD/S方法的数值程序已被用于开发复杂的轨迹代码。这是一种诊断方法，可以揭示观测气流中物质表面的畸变和屈曲，并将应用于研究平流层和对流层上层的这种效应。

This award is one of two separate awards being made for a collaborative project between Dr. Alan Plumb of MIT and Dr. Lorenzo Polvani of Columbia University (ATM-9217844). Their research involves the simulation and understanding of nonlinear aspects of large-scale wave and eddy motions in the atmosphere, using the technique of contour dynamics with surgery (CD/S). This is an efficient computational procedure for the investigation at high resolution of processes such as the spectral cascade of enstrophy in highly nonlinear flows. The PIs plan to apply this technique to investigate further the dynamics of the stratospheric polar vortex, the interaction of quasi-stationary long waves and the Rossby wave dispersion relation in situations where the potential vorticity gradient is concentrated rather than continuous from pole to pole. In addition, they have developed a technique of contour advection with surgery (CA/S) in which the numerical procedures of the CD/S approach have been used to develop a sophisticated trajectory code. This is a diagnostic method which can reveal much about the distortion and buckling of material surfaces in observed flows, and it will be applied to investigate such effects in the stratosphere and in the upper troposphere.