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将研究重新分析数据中向下波耦合（DWC）对对流层循环和气候的影响的动力学性质及其在最先进的季节性预测和气候模型中的代表性。目的是评估对流层中季节性预测和气候预测的潜在影响。这项研究将集中在北半球上，在平流层变异性中可以通过DWC和向下层层平均耦合进行清晰的几个月分离。该分析将洞悉单个波反射事件的动力学原因和复合事件的动态原因和演变，以了解（i）行星波反射对流层波段的相位和幅度结构的直接影响，以及（ii）DWC对向上层的层面层的后续影响对向下层层的下降层面的后续影响。耦合。 对平流层影响对流层影响的动力学过程的理解增加有可能导致改善的季节性预测和气候预测，从而导致重大的社会影响。