Collaborative Research: Topographically Bound Balanced Motions

合作研究：地形约束平衡运动

• 批准号: 1147120
• 负责人: Wayne Schubert
• 金额: $ 39.2万
• 依托单位: Colorado State University
• 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: 2012-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1147120&HistoricalAwards=false
• 关键词: Collaborative; Research; Topographically; Bound; Balanced

This project examines the fundamental dynamics of persistent low-level atmospheric flows which are found along the slopes of mountain ranges and other topographic features. Important examples include the Great Plains low-level jet, the South American low-level jet on the east side of the Andes, and the low-level jet found along the coast of Chile and Peru. The central hypothesis of the project is that topographic low-level jets form due to the elevated solar heating that occurs along the topographic features. More specifically, an inversion technique will be developed to determine the wind and atmospheric mass fields in the vicinity of topography through inversion of the potential vorticity anomalies generated by solar heating. The technique is developed in isentropic coordinates and accounts for the intersection of the topography and the isentropic surfaces, which bend downward toward the topography due to solar heating. The method will be used to understand features of the low-level jets including speed and elevation, and to provide a dynamical framework for interpreting the results of complex state-of-the-art numerical simulations. The analysis will be applied to a number of low-level topographic jets, and to other problems including the onset of the Asian monsoon and its relationship to elevated heating on the Tibetan plateau, the Caribbean low-level jet, and flows near ice sheets.The work has societal relevance due to the importance of low-level jets for regional climate. For example, the Great Plains low-level jet is responsible for a substantial portion of the moisture transport into the eastern half United States which sustains agriculture. In addition, the project will support and train two graduate students, thereby developing the future scientific workforce in this research area. Finally, the inversion methods developed in this project will be made available to researchers in atmospheric dynamics through software codes, so that they can be applied to a wide array of scientific problems.

该项目研究了沿着山脉和其他地形特征的斜率发现的持续低水平大气流的基本动力。 重要的例子包括大平原的低级喷气式飞机，安第斯山脉东侧的南美低级喷气式飞机以及在智利和秘鲁海岸发现的低级喷气式飞机。 该项目的中心假设是，由于沿着地形特征发生的太阳加热升高，地形低级喷气式飞机形式。 更具体地说，将开发一种反转技术，以通过太阳能加热产生的潜在涡度异常来确定地形附近的风和大气质量场。 该技术是在等熵坐标中开发的，并解释了地形和等晶表面的交集，这些表面由于太阳能加热而朝向地形弯曲。 该方法将用于了解低级喷气机的功能，包括速度和高程，并提供一个动态框架来解释复杂的最新数值模拟结果。 该分析将应用于许多低水平的地形喷气机，以及其他问题，包括亚洲季风的发作及其与藏族高原上升温的关系，加勒比海低级喷气式飞机以及冰盖附近的流动。由于低级级别的Jets对法规级别的气候的重要性，这项工作具有社会相关性。 例如，大平原低级喷气式飞机负责向美国东部的大部分水分运输，从而持续农业。 此外，该项目将支持和培训两名研究生，从而在该研究领域发展未来的科学劳动力。 最后，该项目中开发的反转方法将通过软件代码提供给大气动力学的研究人员，以便将它们应用于各种科学问题。