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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.

低层大气小尺度重力波在决定中间层和低热层的动力和热力结构方面起着至关重要的作用。该项目将讨论全球Ws如何影响大气-电离层的能量和动量收支、变率、热层组成和电离层电子密度分布方面的垂直耦合。将把两个综合性的大气环流模型耦合起来，用于模拟从对流层顶到顶部电离层的大气-电离层。一套可用的高层大气测量值，例如来自TIMED卫星、SuperDARN和法布里-佩罗干涉仪的测量值，将用于验证模型场。要讨论的具体专题是：（1）GW对热层环流和组成以及对电离层电子密度分布的影响;（2）重力波在地磁平静期和磁层变化率较高的时期对形成高纬度电离层变化率的影响，（3）在各种地磁和太阳条件下，平流层突然变暖对GW向上传播的影响以及由此引起的GW动力学、热力学和成分效应的变化;（4）在大气和地磁瞬变过程中，来自低层大气的GW直接传播可能是气象和空间天气过程之间的联系。