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现实复杂大气流中线性和非线性行星尺度波动（包括波传播和破碎）的基本理解。将特别关注平流层极地涡旋，其中的化学和动力过程可导致臭氧柱总量严重减少，并且据信它在气候趋势和地表天气模式的短期可预测性中发挥着作用。将研究涉及罗斯贝波动的两个互补范式，其中各自的基本状态包括平滑或不连续的位涡分布。传统上，尽管冬季平流层中的潜在涡度分布往往形成几乎不连续的阶梯状结构，但前一种范式受到了更多关注。在本研究中，将在数值模型中检查梯度，并探索此类模型中水平和垂直分辨率的理想配置。