Influence of Potential Vorticity Distributions on Rossby Wave Propagation in the Troposphere and Stratosphere

位涡分布对罗斯贝波在对流层和平流层传播的影响

• 批准号: 0435931
• 负责人: Richard Scott
• 金额: $ 34.98万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-11-01 至 2007-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0435931&HistoricalAwards=false
• 关键词: Influence; Potential; Vorticity; Distributions; Rossby

This project aims to improve our fundamental understanding of linear and non-linear planetary scale wave motions, including wave propagation and breaking, in realistically complex atmospheric flows. Particular attention will be paid to the stratospheric polar vortex, where chemical and dynamical processes can lead to severe reductions in the total ozone column, and which is also believed to play a role in both climate trends and in shorter term predictability of surface weather patterns. Two complementary paradigms involving Rossby wave motion will be examined in which respective basic states comprise either smooth or discontinuous distributions of the potential vorticity. Traditionally, the former paradigm has received more attention, despite the fact that potential vorticity distributions in the winter stratosphere tend to form almost discontinuous, step-like structures. In this study, gradients will be examined in numerical models and the ideal configuration of horizontal and vertical resolution in such models will be explored.

该项目旨在提高我们对线性和非线性行星比例波动运动的基本理解，包括波浪传播和破裂，在现实的复杂大气流中。特别注意平流层极性涡流，在这种涡流中，化学和动力学过程可能会导致总臭氧柱严重减少，并且还认为这在气候趋势和较短的表面天气模式的期限可预测性中都起着作用。将检查两个涉及Rossby波运动的互补范式，其中各个基本状态包括潜在涡度的平滑或不连续的分布。传统上，尽管冬季平流层中潜在的涡度分布倾向于形成几乎不连续的阶梯式结构，但前者范式受到了更多的关注。在这项研究中，将在数值模型中检查梯度，并将探讨此类模型中水平和垂直分辨率的理想配置。