CEDAR: Wave Coupling and its Role in the Momentum and Energy Budget of the Middle Atmosphere

该项目的目标是更好地了解波耦合机制及其在地球中层大气动力学中的作用。研究人员将利用一个补充的大气环流模式-扩展的加拿大中层大气模式-的数据，研究大气中层和低热层区域的潮汐/行星波、潮汐/重力波和行星/重力波耦合。 他们将使用扩展的CMAM（一个从地球表面到约210公里的完整、三维、自洽和谱的大气环流模式）的年周期模拟数据（包括温度、风、重力波强迫），研究潮汐/行星波和潮汐/重力波相互作用过程的物理机制及其在大气潮汐动量收支中的作用。 他们还将利用扩展的CMAM的一年模拟数据（如风，地球位势高度和重力波强迫）来研究行星/重力波耦合的可能后果-在地球大气层的上部中间层和下部热层区域产生大尺度行星波。 进一步了解行星波在中间层上部和热层下部的向上传播和纬向传播。 这项研究将有助于更好地了解控制中层和高层大气的耦合、能量学和动力学的过程。该项目还涉及非线性的复杂性，这是为了更好地预测“空间天气”而需要在空间大气相互作用区域内加以理解的一个关键要素。此外，这项工作与国际日地系统气候和天气研究界的努力高度相关。该项目通过研究生研究助理的支持，支持在肯塔基州扩大大气动力学研究的努力。

The goal of this project is to better understand wave coupling mechanisms and their role in the dynamics of the Earth's middle atmosphere. The investigators will examine the tidal/planetary wave, tidal/gravity wave and planetary/gravity wave couplings in the Mesosphere and Lower Thermosphere (MLT) region of the atmosphere by employing data from a complementary general circulation model, the extended Canadian Middle Atmospheric Model (CMAM). They will use modeled data (including temperature, winds, gravity wave forcing) over an annual cycle from the extended CMAM, a full, three-dimensional, self-consistent, and spectral general circulation model from the Earth's surface to about 210 km, to study the physical mechanisms of the interaction processes in tidal/planetary wave and tidal/gravity wave and their role in the momentum budget of the atmospheric tides. They will also employ the one-year modeled data from the extended CMAM (such as winds, geopotential height, and gravity wave forcing) to study the possible consequence of the planetary/gravity wave coupling - generation of large-scale planetary waves in the upper mesosphere and lower thermosphere region of the Earth's atmosphere. Further understanding of the upward propagation and latitudinal-propagation of the planetary waves in the upper mesosphere and lower thermosphere will be also achieved. The study will lead to a better understanding of the processes that govern the coupling, energetics and dynamics of the middle and upper atmosphere. The project also addresses the complexity of nonlinearity, a crucial element that needs to be understood within the space atmosphere interaction region (SAIR) in order to better predict 'space weather'. Furthermore, the work is highly relevant to the efforts of the international Climate and Weather of the Sun-Earth System (CAWSES) research community. The project supports efforts to expand atmospheric dynamics research in Kentucky through support of a graduate research assistant.