Collaborative Research: Turbulence and Wave Dynamics from the Mesosphere to the Lower Thermosphere above the Andes

合作研究：从安第斯山脉上方的中间层到低层热层的湍流和波动动力学

• 批准号: 1734267
• 负责人: Gary Swenson
• 金额: $ 12.48万
• 依托单位: University of Illinois at Urbana-Champaign
• 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: 2017-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1734267&HistoricalAwards=false
• 关键词: Collaborative; Research; Turbulence; Wave; Dynamics

This award would support the continued operations of the Na wind-temperature lidar at Andes Lidar Observatory (ALO) in Cerro Pachón, Chile (30.26S, 70.74W, elev. 2530 m) to study the mesosphere and lower thermosphere (MLT) dynamics and ion-neutral coupling processes. The lidar at ALO is a state-of-the-art Na resonance-fluorescence Doppler lidar, capable of measuring 3D wind, neutral temperature and Na density profiles at high vertical (500 m) and temporal (1 min) resolutions in the 80-105 km altitude range with high accuracy. Two key advancements of ALO lidar capabilities featuring the extension of lidar observing profile into the lower thermosphere, with wind and temperature measurements up to 140 km altitude, and the ability to detect turbulence scale perturbations in temperature and wind would enable investigations focused on scientific topics that are at the forefront of MLT science. The physical processes that define the dynamics, structure, and variability in the MLT also operate throughout the atmosphere and in all stratified and sheared geophysical fluids, e.g., oceans, lakes, other planetary atmospheres and stellar interiors. This project would provide opportunities for a postdoc researcher, graduate and undergraduate students to participate in the science, engineering and observations. The data acquired with the Na lidar at ALO will serve a broad community interested in research from the lower atmosphere to the upper thermosphere. Possible science goals that would be studied through the application of the measurements collected are: determination of turbulence fluxes and eddy diffusion coefficients of heat and momentum and the Prandtl number; investigation of the vertical transport of heat and energy caused by dissipating gravity waves at various scales,quantification of the interactions among gravity waves, tides, and planetary waves at different seasons;analysis and modeling of gravity wave evolution process through variable background atmosphere; and understanding the ion-neutral coupling processes underlying the formation of thermospheric Na layers.

该奖项将支持在智利（30.26s，70.74w，Elev。2530m）的CerroPachón安第斯山脉雷达天文台（ALO）的Na风温激光雷达（ALO）的持续操作，以研究中层和下热层（MLT）动力学（MLT）动力学和离子 - 独立中性耦合过程。 ALO的LIDAR是一种最先进的Na共振荧光多普勒激光剂，能够在80-105 km高度范围内高垂直（500 m）和临时（1分钟）分辨率在高垂直（500 m）和临时（1分钟）分辨率下测量3D风，中性温度和Na密度分布。 ALO LIDAR能力的两个关键进步，具有将LiDAR观察曲线扩展到较低热圈中的两个关键进步，风能和温度测量值高达140 km，并且能够检测到温度和风中的湍流尺度扰动的能力，可以促进研究的研究集中在MLT Science的最前沿的科学主题上。定义MLT的动态，结构和可变性的物理过程也在整个大气中以及在所有分层和剪切的地球物理流体中，例如海洋，湖泊，其他行星气氛和恒星内部。该项目将为博士后研究员，研究生和本科生提供机会参加科学，工程和观察。用ALO的NA LIDAR获得的数据将为一个对从下部大气到上部热层的研究感兴趣的广泛社区。通过应用所收集的测量结果将研究的科学目标是：确定湍流通量和涡流差异的热量和动量系数以及prandtl数量；在不同季节的重力波，潮汐和行星波之间的相互作用量化引起的重力波引起的热量和能量的垂直运输的投资；通过可变背景大气进行重力波演化过程的分析和建模；并了解热层Na层形成的基础的离子中性耦合过程。

项目成果

Mesosphere and Lower Thermosphere Changes Associated With the 2 July 2019 Total Eclipse in South America Over the Andes Lidar Observatory, Cerro Pachon, Chile

• DOI: 10.1029/2021jd035064
• 发表时间: 2022-05
• 期刊: Journal of Geophysical Research: Atmospheres
• 作者: Cerro Pachon;F. Vargas;A. Liu;G. Swenson;C. Segura;P. Vega;J. Fuentes;D. Pautet;M. Taylor;Y. Zhao;Y. Morton;H. Bourne

Uncertainties in gravity wave parameters, momentum fluxes, and flux divergences estimated from multi-layer measurements of mesospheric nightglow layers

通过中层夜辉层的多层测量估计重力波参数、动量通量和通量散度的不确定性

• DOI: 10.1016/j.asr.2018.09.039
• 发表时间: 2019
• 期刊: Advances in Space Research
• 影响因子: 2.6
• 作者: Vargas, Fabio