CEDAR-TIMED: Colorado State Sodium Lidar Update

CEDAR-TIMED：科罗拉多州钠激光雷达更新

基本信息

批准号：
9813843
负责人：
Chiao-Yao She
金额：
$ 9万
依托单位：
Colorado State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-03-01 至 2000-02-29
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9813843&HistoricalAwards=false
关键词：
CEDAR TIMED Colorado State Sodium

项目摘要

The investigators will upgrade the Colorado State narrowband sodium lidar from a one-beam system for measuring vertical profiles of temperature and sodium density to a two-beam system capable of simultaneously measuring heat flux, zonal and meridional winds, zonal momentum flux, and meridional momentum flux. The proposed upgrade doubles the power-aperture product of the lidar, making possible a two-beam operation with several operation geometries. The CSU lidar is now in its seventh year of operation and has provided unique observations in the mesopause region (80-105 km). The upgrade will allow better determination of the seasonal variations of mean temperature, winds, and tidal structure, and the evaluation of vertical gradients of heat flux and momentum flux. The mesopause is an important region of the atmosphere where gravity waves, depositing energy and momentum, force a diabatic mean meridional flow that is believed to be responsible for the cold summer and warm winter temperatures observed at those altitudes. These observations will support CEDAR/TIMED science goals. CEDAR, which stands for Coupling, Energetics, and Dynamics of Atmospheric Regions, is a global change program that combines theoretical modeling with ground-based measurements to study the upper atmosphere and ionosphere. TIMED, for Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics, is a NASA satellite program to study similar regions of the atmosphere. The joint CEDAR/TIMED program aims to coordinate ground-based and space-based observations to achieve better understanding of physical processes in the lower thermosphere and ionosphere.

研究人员将科罗拉多州窄带钠激光雷达从用于测量温度和钠密度垂直剖面的单光束系统升级为能够同时测量热通量、纬向和经向风、纬向动量通量和经向动量的双光束系统通量。拟议的升级使激光雷达的功率孔径乘积加倍，使得具有多种操作几何形状的双光束操作成为可能。 CSU 激光雷达现已进入运行第七年，并在中层顶区域（80-105 公里）提供了独特的观测结果。此次升级将能够更好地确定平均气温、风和潮汐结构的季节变化，并评估热通量和动量通量的垂直梯度。中层顶是大气层的一个重要区域，在那里，重力波沉积能量和动量，迫使非绝热平均经向流，这被认为是在这些海拔高度观测到的夏季寒冷和冬季温暖的原因。这些观察结果将支持 CEDAR/TIMED 科学目标。 CEDAR 代表大气区域的耦合、能量和动力学，是一项全球变化计划，它将理论建模与地面测量相结合，以研究高层大气和电离层。 TIMED（热层、电离层、中间层能量学和动力学）是 NASA 的一项卫星计划，旨在研究大气层的类似区域。 CEDAR/TIMED 联合计划旨在协调地面和空间观测，以更好地了解低层热层和电离层的物理过程。