Collaborative Research: Modeling of Secondary and Tertiary Gravity Waves from Orographic Gravity Wave Forcing and Comparison with Satellite Observations

合作研究：地形重力波强迫的二次和三次重力波建模以及与卫星观测的比较

• 批准号: 1832988
• 负责人: Sharon Vadas
• 金额: $ 38.96万
• 依托单位: NorthWest Research Associates, Incorporated
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1832988&HistoricalAwards=false
• 关键词: Collaborative; Research; Modeling; Secondary; Tertiary; Collaborative; Research; Modeling; Secondary; Tertiary

This collaborative project involving both NWRA and Hampton University supports a study of atmospheric dynamics within the region of the Earth's atmosphere that is not accessible by low Earth orbiting satellites or by balloons. Air that is associated with the wind flow over mountainous terrain is disturbed by a class of 'primary' atmospheric gravity waves (GWs) that is called 'mountains waves' (MWs). These waves break or reach critical levels in the lower or middle atmosphere at altitudes below 70 km. This process not only creates small-scale secondary GWs with horizontal wavelengths considerably less than that of the MWs, but also creates horizontal 'body forces' (i.e., horizontal accelerations localized in space and time). These in turn are thought to excite a broad spectrum of secondary GWs with horizontal wavelengths larger than that of the MWs. The main objective of the research is to quantify to the extent possible the effect that secondary and tertiary GWs from MW attenuation has on the thermosphere (the neutral atmosphere above 200 km) via this multi-step coupling process. The research includes a unique combination of detailed, targeted modeling combined with data analyses studies. A graduate student associated with Hampton University would participate in the research work described.Several different simulations would be used in sequence to simulate the entire process. Data from the Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite would be analyzed to extract GWs parameters observed for specific regions on Earth, and the simulations will be compared to these satellite observations. The project will involve applying these results to the study of MWs to investigate the extent to which secondary and tertiary waves that affect the thermosphere are produced. The research if successful should significantly advance the research community's understanding of the process of momentum transfer from orographic forcing to the thermosphere via GWs in this multi-step coupling process. This research is expected to lead to a much better appreciation of the variability and structure of the thermosphere from these processes (i.e., space weather from below) thus helping to achieve a significant broader impact because a predictive capability might possibly be developed for such thermospheric wave structures were this momentum transfer process be understood much more completely as a result of research work represented by this award.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.

这个涉及NWRA和汉普顿大学的合作项目支持了对地球大气区域内大气动态的研究，而低地轨道卫星或气球无法获得。一类称为“山脉波”（MWS）的“原发性”大气重力波（GWS）的一类“原发性”大气重力波（GWS）打扰了与风流相关的空气。这些波在低于70 km的高度下的下部或中间气氛中破裂或达到临界水平。这个过程不仅创建了水平波长的小规模次级GWS，其水平波长大大低于MW的水平波长，而且还产生了水平的“身体力”（即水平加速度在空间和时间上定位）。反过来，这些被认为激发了比MWS大的水平波长的广泛次级GW。这项研究的主要目的是量化MW衰减的次级和第三级GWS对热层（超过200 km的中性气氛）的影响。该研究包括详细的，有针对性的建模与数据分析研究的独特组合。与汉普顿大学相关的研究生将参加所描述的研究工作。将使用几个不同的模拟来模拟整个过程。将分析来自重力场和稳态海洋循环探险家（GOCE）卫星的数据，以提取地球上特定区域的GWS参数，并将模拟与这些卫星观测值进行比较。该项目将涉及将这些结果应用于MWS的研究，以研究影响热圈的二次和第三次波的程度。该研究如果成功的话，应该显着提高研究界对动量转移过程的理解，从地形强迫通过GWS通过GWS在这个多步耦合过程中。预计这项研究将导致对热圈的可变性和结构的更好欣赏（即从下面的空间天气），从而有助于实现更广泛的影响，因为可能会为这种热圈波结构开发出更广泛的影响，因为该势头转移过程可以通过此奖项来理解，因为该奖项的结果是，该奖项的结果是，该奖项的结果是，该奖项是由niss奖所代表的。基金会的智力优点和更广泛的影响评论标准。