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

低层大气小尺度重力波（GWs）在决定中层和低层热层的动力和热结构中起着至关重要的作用。该项目将从能量和动量收支、变率、热层组成和电离层电子密度分布等方面研究gw如何影响大气-电离层的垂直耦合。两个综合的gcm将被耦合并用于模拟从对流层顶到顶层电离层的大气-电离层。一套可用的高层大气测量数据，如TIMED卫星、superdam和Fabry-Perot干涉仪，将用于验证模型场。研究的具体课题有：(1)GW对热层环流和组成以及电离层电子密度分布的影响；(2)重力波对高纬电离层在地磁平静期和磁层高变率期的变化的影响；(3)平流层突然变暖对GW向上传播的影响及其在各种地磁和太阳条件下GW动力、热和成分效应的变化；(4)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。

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.