CEDAR Postdoc: Observational and Modeling Study of Mesospheric Bores

这项研究的目标是对各种中层钻孔现象进行明确的研究，将多层气辉观测分析与建模相结合，以评估现有理论。中层孔是由多个地点的成像系统观察到的尖锐气辉锋。它们的特点是小尺度波浪跟踪大尺度锋面的急剧爆发，如全天相机照片中所示。这些特征被称为中层钻孔，因为它们类似于河道中的潮汐钻孔。目前的理论认为，中层孔是在热逆温层内传播的非线性结构，但要证实这些想法需要对气辉层进行观测，同时提供可用的温度和/或风垂直剖面数据。这项调查包括来自多种仪器的数据分析，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运行，作为毛伊岛中大气层低热层活动的一部分。该研究由四部分组成： 1. 分析多个仪器的数据，寻找钻孔与逆温层或风切变之间的相关性；用于钻孔传播的潜在引导结构。 2. 使用二维化学和二维瞬态动力学模型对气辉响应进行建模，以探索气辉对管道重力波的响应，进而探索可能存在的地理和垂直耦合关系。 3. 分析新钻孔事件，包括反钻孔、钻孔序列和交叉钻孔。 4. 维护气辉数据库以进行孔分析。通过将实验数据分析与建模和理论相结合，该研究将获得有关中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.