The Impact of Downward Wave Coupling on the Tropospheric Circulation

下行波耦合对对流层环流的影响

• 批准号: 1129519
• 负责人: Tiffany Shaw
• 金额: $ 34.36万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1129519&HistoricalAwards=false
• 关键词: Impact; Downward; Wave; Coupling; Tropospheric

The PI will investigate the dynamical nature of the impact of downward wave coupling (DWC) on the tropospheric circulation and climate in reanalysis data and its representation in a state-of-the-art seasonal forecast and climate model. The goal is to assess the potential impact for seasonal forecasts and climate prediction in the troposphere. The research will focus on the Northern Hemisphere where the stratospheric variability allows for a clear separation of months with DWC and downward zonal mean coupling. The analysis will shed insights into the dynamical cause and evolution of individual wave reflection events and composite events to understand (i) the direct impacts of planetary wave reflection from the stratosphere on the phase and amplitude structure of the tropospheric wave pattern and (ii) the subsequent impacts of DWC on the tropospheric circulation both in the mid troposphere and the surface and how they compare to the impacts of downward zonal mean coupling. Increased understanding of the dynamical processes by which the stratosphere can influence the troposphere has the potential to lead to improved seasonal forecasting and climate prediction, thus leading to significant societal impacts.

PI 将研究再分析数据中下行波耦合 (DWC) 对对流层环流和气候影响的动态性质及其在最先进的季节预报和气候模型中的表示。目标是评估对流层季节性预报和气候预测的潜在影响。该研究将集中在北半球，那里的平流层变化使得 DWC 和向下纬向平均耦合的月份有明显的分离。该分析将深入了解单个波反射事件和复合事件的动力学原因和演化，以了解（i）平流层行星波反射对对流层波型的相位和幅度结构的直接影响，以及（ii）DWC 对对流层中部和地表对流层环流的后续影响，以及它们如何与下行纬向平均的影响进行比较 耦合。 增加对平流层影响对流层的动力过程的了解有可能改善季节预报和气候预测，从而产生重大的社会影响。