Fundamental Coupling Processes in the Mesosphere, Lower Thermosphere (MLT) Using Enhanced Na Wind-temperature Lidar Measurements at the Atmospheric Lidar Observatory

该合同是在北方半球中纬度地区（位于犹他州洛根）运行钠和瑞利激光雷达系统。这一综合激光雷达系统将用于开展相关研究，应对中间层和低热层动力学方面的新挑战，并扩大目前正在进行的电离层等离子体通过碰撞相互作用与中性大气相互作用的研究工作。这些系统将能够以高垂直分辨率和时间节奏测量三维风、中性温度和钠密度分布，温度分布范围为30至115公里，风分布范围为80至105公里。当中性Na出现在较高的高度时（可能是由于零星的层形成），风和温度的观测可以延伸到140公里，进入较低的热层。 这一前所未有的垂直测量范围将首次允许对波浪进行研究，从它们开始的区域一直到它们消失的区域。该设施还将代表培训年轻光学工程物理学家的绝佳手段，这些物理学家将非常适合学术界和工业研究领域的许多可能的职业道路。本研究的主要科学目标包括以下几个方面：1.重力波（GW）传播、折射、管道以及可变环境中的能量和动量传输的表征，例如，MLT对平流层变暖的响应，2。GW不稳定性动力学驱动能量和动量沉积、湍流、热、动量和组分输送以及混合的量化，3.了解全球Ws与潮汐和行星波的相互作用，它们对这些领域的影响，以及海浪谱随高度的演变;有助于更好地理解E区的离子中性耦合。采用USU共振和瑞利激光雷达系统的研究将受益于洛根激光雷达站点附近的熊湖天文台当前和即将进行的测量能力。

TThis award is to operate a sodium and Rayleigh lidar systems in the middle latitudes of the Northern Hemisphere (at Logan, Utah). This combined lidar system would be used to undertake correlative studies, addressing new challenges in mesosphere and lower thermosphere (MLT) dynamics as well as extending ongoing work on the study of the interactions of the ionospheric plasma with the neutral atmosphere through collisional interactions. The systems would be capable of measuring three-dimensional wind, neutral temperature and sodium density profiles at high vertical resolution and temporal cadence with a temperature profile for the range from 30 to 115 km and a wind profile for the range from 80 to 105 km. When neutral Na is present at higher altitudes (possibly as a result of sporadic layer formations) the wind and temperature observations can then be extended up to ­140 km into the lower thermosphere. This unprecedented vertical measurement range will, for the first time, allow waves to be studied all the way from the region where they are initiated up to the region where they die out. The facility will also represent an excellent means of training young optical engineering physicists that would then be well suited for many possible career paths in academia and industrial research. The major scientific goals of the research include the following objectives: 1. characterization of gravity wave (GW) propagation, refraction, ducting, and energy and momentum transports in variable environments, e.g., MLT responses to stratospheric warmings, 2. quantification of GW instability dynamics driving energy and momentum deposition, turbulence, heat, momentum, and constituent transports, and mixing, 3. understanding the interactions of GWs with tides and planetary waves, their influences on these fields, and the evolution of the wave spectrum with altitude, and 4. contributing to an improved understanding of ion-neutral coupling in the E region. Studies employing the USU resonance and Rayleigh lidar systems will benefit from current and pending measurement capabilities at the Bear Lake Observatory located nearby the Logan lidar site.