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.

该项目将主要针对次要重力波（SGW）的生产和影响的研究进行研究。主要目的是了解重力波如何产生SGW，然后评估SGWS对Mesosphere和较低热层区域的后续影响。研究开发SGW的过程是必要的，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其中一些SGW是否可以通过关键层传播。这些是不同大气层之间耦合过程的重要方面。大气区域之间的能量转移问题是研究的潜在变革领域，现在是大气研究中的一个积极主题，因为观察和模型最近已获得。该项目将有助于支持两名早期职业研究人员，主要的主要研究人员（PI）是女性，从而改善了太空物理社区中的性别多样性。虽然理论和建模证明了次级重力波的存在，但观察性，统计，统计学和组合建模和在SGW的产生和相关的动量磁通和较低的层次和较低的热量（MESospher）和Messophers of Mesosphere（Me）和较低的热量（MLT）上（MEL）（MELT）和较低的热量（M.该研究的目的是回答以下问题：1）平流层和中层条件如何在重力波的进化和传播中发挥作用，以及导致SGW产生的破裂条件的发展以及破裂条件的发展？ 2）重力波破裂和由MLT中动量转运的次级重力波的影响是什么？ 3）在MLT中观察到的强等地形重力波活性与观察到不同重力波谱的强烈地形重力波活性是什么？该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的评估标准通过评估来进行评估的。