Collaborative Research: Coordinated Resonance and Rayleigh Lidar Studies of the Arctic Atmosphere and Geospace Environment

合作研究：北极大气和地球空间环境的协调共振和瑞利激光雷达研究

• 批准号: 1734693
• 负责人: Bifford Williams
• 金额: $ 10万
• 依托单位: GLOBAL ATMOSPHERIC TECHNOLOGIES AND SCIENCES, INC.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-07-15 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1734693&HistoricalAwards=false
• 关键词: Collaborative; Research; Coordinated; Resonance; Rayleigh

This award would would upgrade the upper atmosphere lidar facility located at the Poker Flat Research Range (PFRR), Alaska (65N, 147W) to achieve a wind and temperature (W&T) measurement capability for the mesosphere and lower thermosphere (MLT) region using the resonance backscatter returns from the sodium layer to obtain these results. This instrument would be applied to undertake correlative studies addressing new challenges in mesosphere and lower thermosphere (MLT) polar dynamics as well as extending ongoing work on the study of ion-neutral coupling processes. A key element of the award would be the transfer of the Na resonance wind-temperature lidar, currently at the Arctic Lidar Observatory for Middle Atmosphere Research, Norway (69N, 16E), to the Lidar Research Laboratory (LRL) at PFRR. This lidar system when established at Poker Flat would be capable of measuring three-dimensional wind, neutral temperature and sodium density profiles at high vertical resolution and temporal cadence. The lidar range coverage would normally be 80-105 km, and when neutral Na is present at higher altitudes (sporadic layer formations) can then be extended up to ¡­140 km into the lower thermosphere. This facility will 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 PFRR lidar system will benefit from current and pending measurement capabilities at PFRR, including ground-based imaging of neutral and plasma dynamics, the construction of a new meteor radar, and in situ measurements made possibly by pending and future rocket measurements. The PFRR lidar team also has extensive modeling capabilities that will continue to benefit the interpretation and understanding of lidar and correlative instrument measurements.

该奖项将升级位于阿拉斯加扑克平面研究系列（PFRR）（65n，147W）的高层雷达设施，以实现中层和下热圈（MLT）区域的风能和温度（W＆T）测量能力，该测量能力使用从钠层从钠层获得这些结果来获得这些结果。该仪器将用于进行相关研究，以应对中层和较低热层（MLT）极性动力学的新挑战，并扩展了正在进行的关于离子中性耦合过程的研究。该奖项的一个关键要素是将NA共振气温激光雷达转移，目前位于挪威中部大气层研究（69n，16e）的北极激光雷达观察站向PFRR的激光雷达研究实验室（LRL）。在扑克平坦建立的激光雷达系统将能够在高垂直分辨率和临时节奏下测量三维风，中性温度和钠密度曲线。激光射线范围的覆盖范围通常为80-105 km，当中性NA处于较高的高度（零星层地层）时，可以将其延伸至下部热层。该设施将代表培训年轻的光学工程物理学家的一种极好的手段，然后将非常适合学术和工业研究中的许多可能的职业道路。这项研究的主要科学目标包括以下目标：1。引力波（GW）传播，折叠，避免，抑制，感染和能量运输的特征，以及在可变环境中的量化，例如，量化的环境，例如，量化的量度，例如，量化量，例如，量子量，等级，g。驱动能量和动量沉积，湍流，热量，动量和成分传输和混合，3。了解GWS与潮汐和行星波的相互作用，它们对这些田地的影响以及海拔波频谱与高度的演变，以及4。有助于对Eion-nir-eytral couplation e e e e e coupplation couplation eion couplation。采用PFRR激光雷达系统的研究将受益于PFRR的当前和待处理的测量能力，包括中性和等离子体动力学的地面成像，新的Meteor雷达的构建以及通过待定和未来的Rocket测量结果成为可能的现场测量。 PFRR激光圈团队还具有广泛的建模功能，将继续有益于激光雷达和相关仪器测量的解释和理解。

项目成果

In Situ Observations of Neutral Shear Instability in the Statically Stable High‐Latitude Mesosphere and Lower Thermosphere During Quiet Geomagnetic Conditions

安静地磁条件下静态稳定的高纬度中间层和低热层中性剪切不稳定性的现场观测

• DOI: 10.1029/2020ja027972
• 发表时间: 2020
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Mesquita, Rafael L. A.;Larsen, Miguel F.;Azeem, Irfan;Stevens, Michael H.;Williams, Bifford P.;Collins, Richard L.;Li, Jintai
• 通讯作者: Li, Jintai

Lidar Observations of Instability and Estimates of Vertical Eddy Diffusivity Induced by Gravity Wave Breaking in the Arctic Mesosphere

北极中层重力波破碎引起的不稳定性激光雷达观测和垂直涡流扩散率估计

• DOI: 10.1029/2020jd033450
• 发表时间: 2021
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: Li, Jintai;Collins, Richard;Lu, Xian;Williams, Bifford
• 通讯作者: Williams, Bifford