Atmospheric Teleconnection Dynamics of North Atlantic Cooling to the Tropical Climate

北大西洋变冷对热带气候的大气遥相关动态

• 批准号: 1143329
• 负责人: John Chiang
• 金额: $ 12.94万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-03-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1143329&HistoricalAwards=false
• 关键词: Atmospheric; Teleconnection; Dynamics; North; Atlantic

This project seeks to understand the processes through which the cooling of the extratropical North Atlantic results in a weakening of the North African and Asian monsoons. The weakening of the monsoons in response to North Atlantic cooling is suggested in paleoclimate evidence from the last glacial period, and is also relevant to 20th century climate change including the decades-long Sahel drought. Work under this award will examine the teleconnection between North Atlantic cooling and the monsoon systems through simulations with a simplified climate model, in which the ocean component model is replaced with a "slab ocean" which represents ocean thermodynamics but not dynamics. Preliminary work shows that the model is capable of reproducing the teleconnection, and the research will consist of diagnostic analysis of model output, combined with a suite of model experiments, to identify the primary mechanisms through which the influence of North Atlantic cooling is communicated to the monsoon regions.In addition to its scientific interest, the question addressed here has societal relevance due to the large number of people who live in the monsoon regions of Asia and North Africa. In addition, the project will support and train a graduate student, thereby providing for the next generation of scientists engaged in this research area.

该项目旨在了解北大西洋温带变冷导致北非和亚洲季风减弱的过程。 末次冰期的古气候证据表明，北大西洋变冷导致季风减弱，这也与20世纪的气候变化有关，包括长达数十年的萨赫勒干旱。 该奖项的工作将通过使用简化的气候模型进行模拟来研究北大西洋冷却与季风系统之间的遥相关，其中海洋成分模型被代表海洋热力学而非动力学的“板状海洋”所取代。 初步工作表明，该模型能够再现遥相关，研究将包括模型输出的诊断分析，结合一系列模型实验，以确定北大西洋变冷的影响传递给大气层的主要机制。除了科学意义外，这里讨论的问题还具有社会意义，因为亚洲和北非季风地区生活着大量人口。 此外，该项目还将支持和培训一名研究生，从而为从事该研究领域的下一代科学家提供支持。