COLLABORATIVE RESEARCH: Nonlinear Atmospheric Wave and Vortex Dynamics

这个奖项是两个独立的奖项之一， 哥伦比亚大学的洛伦佐·波尔瓦尼博士 大学和麻省理工学院的Alan Plumb博士（ATM-9218841）。 他们的研究 涉及模拟和理解的非线性方面， 大气中的大尺度波动和涡流运动，使用 轮廓动力学手术技术（CD/S）。 这是一 高效的计算程序的调查，在高 像涡度拟能谱级联这样的过程的分辨率 在高度非线性的流动中。 PI计划将此技术应用于 进一步研究平流层极涡的动力学， 准定常长波与Rossby波的相互作用 在位涡 梯度是集中的，而不是从一极到另一极连续的。 此外，他们还开发了一种等值线平流技术 与手术（CA/S），其中CD/S的数值程序 方法已被用来开发一个复杂的轨迹代码。 这是一种诊断方法，可以揭示很多关于 观察到的流动中材料表面的变形和屈曲，以及 它将被应用于研究平流层中的这种效应 和对流层上部。

This award is one of two separate awards being made for a collaborative project between Dr. Lorenzo Polvani of Columbia University and Dr. Alan Plumb of MIT (ATM-9218841). 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.