Annual and Interannual Variabilities in the Kinematics and Dynamics of the Polar Stratosphere

极地平流层运动学和动力学的年度和年际变化

• 批准号: 9980676
• 负责人: Noboru Nakamura
• 金额: $ 36.4万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9980676&HistoricalAwards=false
• 关键词: Annual; Interannual; Variabilities; Kinematics; Dynamics

Accurately representing the dynamics of the springtime polar stratosphere is crucial for predicting the extent of ozone depletion and its influence over lower latitudes, yet general circulation models (GCMs) typically do not handle this aspect of the meteorology well enough to allow for a successful coupling of dynamics and chemistry. The research under this award will explore some of the key, and as yet not well understood, dynamical processes that are involved. The results should ultimately lead to improvement of dynamics-photochemistry coupling in GCMs. The co-principal investigators plan to carry out observational and theoretical investigations of the seasonal and interannual variability of the meteorological conditions of the polar stratosphere, focusing on understanding the dynamics of the final warming over the poles. Horizontal mixing and diffusivity and the evolution of wave activity will be examined in an application of the quasi-Lagrangian perspective originally developed by Dr. Nakamura . The co-investigators will employ several gridded assimilated analyses as the basis for the observational studies and also conduct numerical experiments with a hierarchy of idealized models. They also plan to compare and contrast the evolution of the warming as it occurs in the Arctic and Antarctic.

准确地描述春季极地平流层的动力学对于预测臭氧消耗的程度及其对低纬地区的影响至关重要，但大气环流模式(GCM)通常不能很好地处理气象学的这一方面，无法成功地将动力学和化学耦合起来。该奖项下的研究将探索所涉及的一些关键的、尚未被很好理解的动态过程。这一结果将最终导致GCMS中动力学-光化学耦合的改善。联合首席调查员计划对极地平流层气象条件的季节和年际变化进行观测和理论调查，重点是了解两极最终变暖的动态。水平混合和扩散率以及波活动的演变将在由Nakamura博士最初开发的准拉格朗日视角的应用中进行研究。联合调查员将使用几个网格化同化分析作为观测研究的基础，并用一系列理想化模式进行数值试验。他们还计划比较和对比北极和南极气候变暖的演变。