CEDAR: High Spectral Resolution Lidar for Profiling Mesopause Temperature, Wind, and Sodium Density

这笔赠款支持了钠温度激光雷达物理及其应用的继续研究。预计随着技术的改进，激光频率不确定引起的温度误差可以降低到0.1K的水平，激光雷达也可以用来测量径向风速，精度达到1米/S。由于对中层顶区的温度结构知之甚少，高分辨率的温度和多普勒风剖面的测量是及时的和具有地球物理意义的。将开展一项为期三年的研究方案，以进一步调查和使用高光谱分辨率钠荧光激光雷达的物理，并通过使用这一独特的激光雷达系统定期和较长时间的观测来阐明中层区域的地球物理。特别是，PI将(1)在钠蒸气中进行饱和无多普勒荧光光谱的实验室和理论研究，以提高测量精度，(2)修改现有的激光雷达，以同时测量温度和多普勒-风，(3)建立科罗拉多州柯林斯堡中层顶区的夜间气候学，(4)分析，根据相关的中间层对重力波引起的扰动的响应来组织和解释这些独特的激光雷达数据。*//

This grant supports the continued study of the physics of Na temperature lidar and its applications. It is expected that with improved technology the temperature error due to laser frequency uncertainty can be reduced to the level of 0.1 K, and that the lidar can also be used to measure radial wind velocity to an accuracy of 1 m/s. Since very little is known about the temperature structure in the mesopause region, measurements of temperature and Doppler-wind) profiles with high resolution are timely and of geophysical interest. A three year-research program will be carried out to further investigate and employ the physics of high-spectral-resolution Na fluorescence lidar, and to elucidate the geophysics in the mesospause region by performing observations regularly and over an extended period with this unique lidar system. In particular, the PI will (1) conduct laboratory and theoretical studies of saturated Doppler-free fluorescence spectroscopy in Na vapor for the purpose of improving measurement accuracy, (2) modify the existing lidar for simultaneous temperature and Doppler-wind measurements, (3) establish nighttime climatology of the mesopause region over Fort Collins, CO and (4) analyze, organize and interpret these unique lidar data in terms of correlated mesospheric response to gravity wave induced perturbations. *** //