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Collaborative Research: Characterizing Secondary Gravity Waves and Influences on Momentum Transport

合作研究：表征二次重力波及其对动量传输的影响

基本信息

批准号：
1822867
负责人：
Sharon Vadas
金额：
$ 6.87万
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：
2018-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1822867&HistoricalAwards=false
关键词：
Collaborative Research Characterizing Secondary Gravity

项目摘要

This project would carry out research primarily aimed at the study of the production and effects of secondary gravity waves (SGWs). The main objective is to understand how breaking gravity waves produce SGWs and then to assess the subsequent effect of SGWs on the mesosphere and lower thermosphere region. Studying the process of developing SGWs is necessary because these waves would potentially transport momentum to higher altitudes than the primary GW. The science plan of this project would also consider whether some of these SGWs could propagate even through a critical layer. These are important aspects of the coupling processes between different atmospheric layers. This question of energy transfer between atmospheric regions is a potentially transformative area of research and is an active topic in atmospheric research now that observations and models have recently become available. This project would help support two early career researchers with the lead Principal Investigator (PI) being a woman thus improving the gender diversity within the space physics community.While theory and modeling demonstrate the presence of secondary gravity waves, there are few observational, statistical, and combined modeling and observational studies on SGW generation and associated momentum flux and influences within the mesosphere and lower thermosphere (MLT) region. The research aims to answer the following questions: 1) How do stratospheric and mesospheric conditions play a role in the evolution and propagation of gravity waves into the MLT and the progression of breaking conditions leading to SGW generation? 2) What are the implications of gravity wave breaking and resulting secondary gravity waves on momentum transport in the MLT? 3) What is the correlation between strong orographic gravity wave activity observed in the Northern hemisphere and observations of different gravity wave spectra in the MLT?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.

该项目将开展研究，主要目的是研究二次重力波的产生和影响。主要目的是了解破碎的重力波如何产生SGWs，然后评估SGWs对中间层和低热层区域的后续影响。研究SGW的发展过程是必要的，因为这些波可能会将动量传输到比主要GW更高的高度。该项目的科学计划还将考虑这些SGW中的一些是否甚至可以通过临界层进行传播。这些都是不同大气层间耦合过程的重要方面。这一大气区域之间的能量转移问题是一个潜在的变革性研究领域，由于观测和模型最近已经可用，因此是大气研究中的一个活跃主题。该项目将帮助支持两名早期职业研究人员，首席研究员（PI）是一名女性，从而改善空间物理学界的性别多样性。以及关于SGW生成和相关动量通量以及中间层和低热层影响的综合模拟和观测研究（MLT）区域。该研究旨在回答以下问题：1）平流层和中间层条件如何在重力波向MLT的演化和传播以及导致SGW生成的破碎条件的进展中发挥作用？2)重力波破碎和由此产生的二次重力波对MLT中动量输运的影响是什么？3)在北方观测到的强地形重力波活动与在MLT观测到的不同重力波谱之间的相关性是什么？该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估的支持。