Collaborative Research: High-Time-Resolution Resonance Lidar Detection of Meteor Trails

合作研究：流星轨迹的高时间分辨率共振激光雷达探测

• 批准号: 0525621
• 负责人: Jonathan Friedman
• 金额: $ 5.88万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-10-01 至 2010-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0525621&HistoricalAwards=false
• 关键词: Collaborative; Research; Time; Resolution; Resonance

Metallic deposition by meteor ablation in the upper mesosphere and lower thermosphere is quantified by lidar observations of meteor trails, and the relationship between the quantified meteoric deposition and long-lifetime metallic layers is explored. The required observations are accomplished with upgraded resonant lidar systems at the Arecibo Observatory. The extant potassium resonant lidar system is first modified to sample every lidar return pulse, improving temporal resolution within the beam to 35 ms and altitude resolution to 150 m in the upper mesosphere. Following that upgrade, including development and application of real-time signal processing algorithms, the Fe, Ca, Ca+, and Na lidar systems are also upgraded. The ratios of meteor tail metals to metallic content in sporadic layers is used to improve our understanding of the dynamic and chemical processes that lead to metallic layering in the atmospheric region. The meteor trail metallic deposition rate is also used to calculate direct metallic deposition to the atmosphere on a global scale.

通过流星轨迹的激光雷达观测来量化中层上部和热层下部流星烧蚀造成的金属沉积，并探讨了量化的流星沉积与长寿命金属层之间的关系。所需的观测是通过阿雷西博天文台升级的谐振激光雷达系统完成的。现有的钾共振激光雷达系统首先经过修改，可以对每个激光雷达返回脉冲进行采样，将光束内的时间分辨率提高到 35 ms，将中层上部的高度分辨率提高到 150 m。升级之后，包括实时信号处理算法的开发和应用，Fe、Ca、Ca+和Na激光雷达系统也进行了升级。流星尾部金属与零星层中金属含量的比率用于提高我们对导致大气区域金属分层的动态和化学过程的理解。流星尾迹金属沉积率还用于计算全球范围内向大气的直接金属沉积。