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(SSW)事件期间，当观察到从低层大气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力学过程影响电离层。该项目涉及使用国家大气研究中心热层-电离层-中间层-电动力学一般环流模式(TIME-GCM)和具有热层和电离层延伸的整个大气层社区气候模式(WACCM-X)来解决一系列问题：是什么导致了SSW期间大气层、太阳和月球潮汐的变化？SSW期间行星波是否有显著变化？SSW过程中风的快速变化对重力波的产生有什么影响？电离层对潮汐、行星波和重力波的变化有何反应？这些影响是如何依赖于太阳活动的？这项研究的结果将更好地理解造成SSW效应的低层和高层大气的跨区域和跨尺度耦合。

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.