CEDAR: Short-Term Variability of the Upper Atmosphere during Stratospheric Sudden Warming Events

该项目的目标是研究在平流层突然变暖事件期间，当观测到从低层到高层大气的深刻变化时，低层大气如何通过动力学和电动学过程影响电离层。 该项目涉及使用国家大气研究中心的热层-电离层-中间层-电动力学环流模式（TIME-GCM）和热层和电离层扩展的全大气社区气候模式（WACCM-X）来解决一些问题：什么原因导致SSW期间大气太阳和月球潮汐的变化？ 在SSW期间，行进的行星波是否有显著的变化？ SSW期间风的快速变化对重力波产生的影响是什么？ 电离层如何响应潮汐、行星波和重力波的变化？ 这些影响如何取决于太阳活动？ 这一研究结果将有助于更好地理解SSW效应的跨区域和跨尺度的低层和高层大气耦合。

The goal of this project is to investigate how the lower atmosphere affects the ionosphere through dynamical and electrodynamical processes during stratospheric sudden warming (SSW) events, when profound changes have been observed from the lower to upper atmosphere. The project involves using the National Center for Atmospheric Research Thermosphere-Ionosphere-Mesosphere- Electrodynamics General Circulation Model (TIME-GCM) and the Whole Atmosphere Community Climate Model with thermosphere and ionosphere extension (WACCM-X) to address a number of questions: What causes changes to atmospheric solar and lunar tides during a SSW? Are there significant changes of traveling planetary waves during a SSW? What is the impact of rapid wind change during a SSW on gravity wave generation? How does the ionosphere respond to the changes of tides, planetary waves, and gravity waves? How do these effects depend on solar activity? The result of this study will be a better understanding of the cross-region and cross-scale coupling of the lower and upper atmosphere responsible for the SSW effects.