CEDAR Postdoc: Observational and Modeling Study of Mesospheric Bores

这项调查的目的是对各种中间层钻孔现象进行明确的研究，将对多层气辉观测的分析与建模相结合，以评估现有的理论。中间层小孔是由成像系统在几个位置观测到的锐利的气辉锋面。它们的特征是在大尺度锋面急剧爆发后跟踪的小尺度波，如全天空相机照片所示。这些特征被称为中间层孔，因为它们与河道中的潮汐孔相似。目前的理论认为，中间层孔是在热逆温层内传播的非线性结构，但要证实这些理论，需要对气辉层进行观测，并同时获得温度和/或风的垂直廓线数据。这项调查包括来自多台仪器的数据分析，包括气辉成像仪、激光雷达和流星雷达，所有这些仪器目前都在毛伊岛上运行，作为毛伊岛-中大气低热层活动的一部分。这项研究由四部分组成：1.分析来自多台仪器的数据，以寻找钻孔和热逆温层或风切变之间的相关性；潜在的钻孔传播的指导结构。2.使用二维化学和二维含时动力学模型模拟气辉响应，以探索气辉对导管重力波的响应，进而探索可能存在的地理和垂直耦合关系。3.分析新的钻孔事件，包括反钻孔、钻孔列车和交叉钻孔。4.维护用于炮膛分析的气辉数据库。通过将实验数据的分析与模拟和理论相结合，这项研究将提供关于中间层孔的形态和动力学、它们对背景流的影响以及它们对其他区域能量沉积的影响的重要信息。

The goal of this investigation is to perform a definitive study of the various mesospheric bore phenomena, combining analysis of multiple layer airglow observations with modeling in order to evaluate existing theories. Mesospheric bores are sharp airglow fronts observed by imaging systems at several locations. They are characterized by small-scale waves tracking behind the sharp onset of a large-scale front as seen in all-sky camera photographs. These features are called mesospheric bores because of their resemblance to tidal bores in river channels. Current theories are that mesospheric bores are nonlinear structures propagating within a thermal inversion layer, but confirmation of these ideas require observations of airglow layers with simultaneous temperature and/or wind vertical profile data available. This investigation includes data analysis from multiple instruments, including airglow imagers, lidar, and meteor radar, all of which are currently operating on Maui as part of the Maui-Middle Atmosphere Lower Thermosphere campaign. The study consists of a four-part approach: 1. Analyze data from multiple instruments to look for correlation between bores and thermal inversion layers or wind shears; potential guiding structures for bore propagation. 2. Model airglow response using 2-D chemistry & 2-D time-dependent dynamics models to explore the airglow response to ducted gravity waves, and in turn, the geographical and vertical coupling relationships which may exist. 3. Analyze new bore events, including, inverse bores, bore trains, and crossing bores. 4. Maintain airglow database for bore analysis. By combining the analysis of experimental data with modeling and theory, the study will yield important information on the morphology and dynamics of the mesospheric bores, their effects on the background flow, and their effects on energy deposition in other regions.