CAREER: Physical Causes of Multi-Scale Temporal Variability in Atmospheric Tides from the Troposphere to the Dynamo Region

起源于低层大气的大气潮汐是电离层变化的重要驱动因素，因此也是电离层等离子体密度的纵向和当地时间变化的重要驱动因素。该项目的总体目标是更好地了解从对流层到电离层发电机区域的大气潮汐多尺度时间变化的主要来源和过程。这将进一步加深我们对高层大气与低层大气通过大气波的能量、质量和动量的转换和传输的跨尺度耦合过程的理解，最终提高空间天气预报能力。 具体而言，该项目将审查：（1）从低层到高层大气潮汐的年际变化及其与厄尔尼诺-南方涛动（ENSO）和平流层准两年振荡（QBO）的耦合过程;（2）从低层到高层大气潮汐的季节变化;（3）从低层到高层大气潮汐的逐日变化及其与平流层突然变暖（SSW）事件的耦合。采用的数据来自一个先进的动力学-化学耦合全球环流模式，扩展的加拿大中层大气模式（eCMAM）。分析期为1979- 2010年。该项目将由路易斯维尔大学一个不断发展的大气科学项目的女助理教授领导，该项目正在吸引少数民族和妇女。将对研究生和本科生进行空间气象相关研究方面的培训。外联活动将使K-12学生和高中教师接触大气科学。

Atmospheric tides originating in the lower atmosphere are an important driver of ionospheric variability and thus of the longitudinal and local time variability of ionospheric plasma density. The overarching objective of this project is to better understand the major sources of, and processes responsible for, the multi-scale temporal variability of the atmospheric tides from the troposphere to the ionosphere dynamo region. This will advance our understanding in cross-scale coupling processes of the upper atmosphere to the lower atmosphere through the transformation and transport of energy, mass, and momentum by atmospheric waves and ultimately, result in a better space weather forecasting capability. In particular, the project will examine: i) the inter-annual variability of the atmospheric tides from the lower to upper atmosphere and their coupling processes to the El Nino-Southern Oscillation (ENSO) and the stratospheric Quasi-biennial Oscillation (QBO), ii) the seasonal variability of the atmospheric tides from the lower to upper atmosphere, and iii) the day-to-day variability of the atmospheric tides from the lower to upper atmosphere and its coupling with the Stratospheric Sudden Warming (SSW) events. The data employed are from an advanced dynamics-chemistry coupled Global Circulation Model, the extended Canadian Middle Atmosphere Model (eCMAM). The analysis period covers 1979-2010.This project will be led by a female assistant professor in a growing program of atmospheric science at the University of Louisville, which is attracting minorities and women. Graduate and undergraduate students will be trained in space-weather related research. Outreach activities will expose K-12 students and high school teachers to atmospheric science.