CEDAR: Vertical Coupling in the Atmosphere-Ionosphere System by Gravity Waves

CEDAR：重力波在大气-电离层系统中的垂直耦合

基本信息

批准号：
1452137
负责人：
Erdal Yigit
金额：
$ 22.69万
依托单位：
George Mason University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-07-01 至 2019-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1452137&HistoricalAwards=false
关键词：
CEDAR Vertical Coupling Atmosphere Ionosphere

项目摘要

Lower atmospheric small-scale gravity waves (GWs) play a crucial role in determining the dynamical and thermal structure of the mesosphere and lower thermosphere. This project will address how GWs influence the vertical coupling in the atmosphere-ionosphere in terms of energy and momentum budget, variability, thermospheric composition, and ionospheric electron density distribution. Two comprehensive GCMs will be coupled and used to simulate the atmosphere-ionosphere from the tropopause to the topside ionosphere. A suite of available upper atmosphere measurements, such as, from the TIMED satellite, SuperDARN, and Fabry-Perot Interferometers, will be used to validate the model fields. Specific topics to be addressed are: (1) GW effects on the circulation and composition of the thermosphere and on the distribution of ionospheric electron density; (2) The influence of gravity waves in shaping the variability of the high-latitude ionosphere, in both geomagnetically quiet periods and those of higher magnetospheric variability, (3) The impact of sudden stratospheric warming on the upward propagation of GWs and the resulting changes in GW dynamical, thermal, and compositional effects in various geomagnetic and solar conditions; (4) The direct GW propagation from the lower atmosphere during atmospheric and geomagnetic transient processes as a possible link between meteorological and space weather processes.

下部大气中的小规模重力波（GWS）在确定中层和较低热层的动力学和热结构中起着至关重要的作用。该项目将解决GWS如何在能量和动量预算，可变性，热层组成和电离层电子密度分布方面影响大气离子层中的垂直耦合。将耦合两个综合的GCM，并用于模拟从对流层顶到顶部电离层的大气离子层。一套可用的上层大气测量值，例如，将使用定时卫星，超级舞蹈和Fabry-Perot干涉仪来验证模型场。要解决的特定主题是：（1）GW对热圈的循环和组成以及电离层电子密度的分布的影响；（2）重力波在塑造高纬度电离层的变异性上的影响，在地质上安静的时期和较高的磁层变异性的变异性，（3）（3）平流层变暖对GWS向上传播的突然变化以及GW动态，热和组合效应在各种地球上的影响和组合效应的影响；（4）在大气和地磁瞬态过程中，下层大气中的直接GW传播是气象和太空天气过程之间的可能联系。