Collaborative Research: CEDAR--A Whole-Atmospheric Perspective on Connections between Intra-Seasonal Variations in the Troposphere and Thermosphere

合作研究：CEDAR——对流层和热层季节内变化之间联系的整体大气视角

• 批准号: 2113412
• 负责人: Astrid Maute
• 金额: $ 2万
• 依托单位: University Corporation For Atmospheric Res
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2113412&HistoricalAwards=false
• 关键词: Collaborative; Research; CEDAR; Whole; Atmospheric

This collaborative award is aimed at studying the relationship between the variability of thermospheric winds to the variability caused by wave structures generated in the tropical troposphere. This coupling is driven by wave excitation by deep convection in the tropical troposphere that can propagate vertically into the thermosphere. Tropospheric convection associated with the Madden‐Julian Oscillation (MJO), the dominant mode of intra-seasonal variability in tropical convection and circulation, is known to modulate the intensity of upward‐propagating gravity and Kelvin waves. Previous work demonstrated that a 90-day oscillation in tropospheric convection during 2009-2010 was imprinted on both thermospheric mean winds and the eastward propagating wavenumber 3 diurnal (DE3) tidal amplitudes. This modulation was observed by the GOCE and CHAMP satellites and modeled with the TIME-GCM. The research effort would broaden participation by involving and training two undergraduate student interns through the University of Colorado BOLD internship program that focuses on promoting the recruitment, retention, and development of traditionally underrepresented engineering students. The new research will follow up on the results obtained in recent studies that demonstrated that strong coupling between the troposphere and the thermosphere occurs on intra-seasonal timescales. The award will address the following questions: Q1: How frequent, prevalent, and persistent are correlations between 30 to 100-day variations in the three regions of troposphere, mesosphere, and thermosphere, during the past two decades? Q2: What plausible roles do large-scale upward propagating waves play in dynamically coupling tropical tropospheric intra-seasonal variability into the thermosphere? Q3: Is there any observational evidence suggesting a connection between this troposphere-thermosphere intra-seasonal coupling and MJO, Quasi-Biennial Oscillation (QBO) and El Niño-Southern Oscillation (ENSO)? The combination of available upper atmosphere satellite data with ground-, and model-based datasets would be studied to provide insight into whether the intra-seasonal variations in the waves are caused by variability in the tropospheric sources or by wave-mean flow interactions. In the case of the latter, the study would determine at which heights these interactions are occurring. This study will determine the contribution of global-scale wave coupling between the troposphere and the thermosphere, thus addressing outstanding issues of fundamental importance to the CEDAR community.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该合作奖项旨在研究热层风的变化与热带对流层中产生的波结构引起的变化之间的关系，这种耦合是由热带对流层中的深层对流引起的波激发驱动的，这种波激发可以垂直传播到热层中。与马登-朱利安振荡 (MJO) 相关的对流层对流是热带对流和环流季节内变化的主要模式，已知可以调节先前的工作表明，2009-2010 年期间对流层对流的 90 天振荡对热层平均风和向东传播的波数 3 日潮汐幅度都有影响。 GOCE 和 CHAMP 卫星并以 TIME-GCM 为模型，该研究工作将通过让两名本科生参与和培训来扩大参与范围。科罗拉多大学 BOLD 实习项目的重点是促进传统上代表性不足的工程专业学生的招募、保留和发展。这项新研究将跟进最近的研究结果，这些研究表明对流层和热层之间存在很强的耦合性。该奖项将解决以下问题： Q1：对流层、中层和中层三个区域的 30 至 100 天变化之间的相关性如何？问题 2：在过去 20 年中，大规模向上传播波在将热带对流层季节内变化与热层动态耦合方面发挥了哪些作用？ 问题 3：是否有任何观测证据表明对流层-热层内部之间存在联系？ - 季节性耦合和 MJO、准两年期振荡 (QBO) 和厄尔尼诺南方涛动 (ENSO) 可用的高层大气卫星数据与地面、和将研究基于模型的数据集，以深入了解波浪的季节内变化是由对流层源的变化引起的还是由波浪与平均流的相互作用引起的。对于后者，该研究将确定在哪些高度。这些相互作用正在发生。这项研究将确定对流层和热层之间反映的全球尺度波耦合的贡献，从而解决对 CEDAR 社区具有根本重要性的突出问题。该奖项是 NSF 的法定使命，并被认为值得通过支持。评估使用基金会的智力价值和更广泛的影响审查标准。