Collaborative Research: Lidar Studies of Middle Atmosperhic Dynamics (CEDAR)

合作研究：中大气动力学激光雷达研究 (CEDAR)

• 批准号: 9302118
• 负责人: Vincent Wickwar
• 金额: $ 10万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1996-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9302118&HistoricalAwards=false
• 关键词: Collaborative; Research; Lidar; Studies; Middle

A lidar consortium consisting of Clemson University (CU), Utah State University (USU), the University of Maryland (UMD), and the University of Pittsburgh (UP) jointly propose a 2-year research program on middle atmosphere dynamics based on Doppler Rayleigh and Raman lidar observations combined with other optical measurements obtained at Bear Lake Observatory (BLO) and measurements of winds, densities, and temperatures obtained from balloon and rocket flights. (Proposals have been submitted by three institutions using the same text, but different budgets; UP will support this effort through current NSF funding.) CEDAR funding made possible the installation in Utah of a Nd:YAG Rayleigh lidar system that had been developed at UMD and moved to USU to be part of the BLO facilities. The possible altitude coverage has been extended upward to 75 km with the addition of a 6 times more powerful frequency-stable Nd:YAG laser that was purchased by CU for use with the lidar Consortium system. This upgrade of the Maryland lidar facility also includes one additional detector channel, which is a Raman 607 nm channel that extends profile observations of temperature structure downward to the ground from 30 km. The first year of this proposed effort would continue observations of components - a high-resolution Fabry Perot etalon and a double-axis mirror system - that are necessary for measuring the Doppler shift of the backscattered Rayleigh and Mie lidar spectra to observe line-of-sight winds in the middle atmosphere. A small radar system will be added to observe line-of-sight winds in the middle atmosphere. A small radar system will be added to shut off the laser transmitter when any aircraft is near the beam. A new lidar transmission channel will be added (607 nm) based on Raman-shifting the Nd laser output in a high pressure Raman cell. Upon completion of these instrumental modifications at the beginning of the second year of the grant award, application of the new Doppler lidar would collect vertical profiles of middle atmosphere winds and temperature from clear-air portions of the atmosphere above 10 km by using the laser returns from Mie (particulate) scattering and Rayleigh scattering at 532 nm. These profiles will provide the basis for examining the occurrence, structure, interaction, and variability of the jet stream, planetary waves, tides, and gravity waves in the middle atmosphere above the extended mountainous region of the American Rocky Mountain chain. The oblique propagation of these waves through the middle atmosphere as filtered by the prevailing winds in the middle atmosphere will be related to the dynamic activity simultaneously observed in the mesopause region by several instruments at BLO. Correlative observations of temperature, density, and winds will be made between the lidar and a combination of balloons and rockets. A by- product of the PIs observations will be the measurement of aerosol backscatter and extinction in high clouds, particularly thin cirrus, and the detection of stratospheric aerosols.

A lidar consortium consisting of Clemson University (CU), Utah State University (USU), the University of Maryland (UMD), and the University of Pittsburgh (UP) jointly propose a 2-year research program on middle atmosphere dynamics based on Doppler Rayleigh and Raman lidar observations combined with other optical measurements obtained at Bear Lake Observatory (BLO) and measurements of winds, densities, and从气球和火箭飞行中获得的温度。 （提案已由三个机构使用相同的文本提交，但是不同的预算； UP将通过当前的NSF资助来支持这项工作。）Cedar资金使得在犹他州的ND：Yag Rayleigh Lidar Systems在UMD开发并移至USU成为Blo设施的一部分。 可能的高度覆盖范围已延长至75公里，增加了强大的频率稳定性ND：YAG激光器的6倍，该激光器是CU购买的，可与LIDAR财团一起使用。 马里兰州激光雷达设施的这种升级还包括一个附加的检测器通道，这是一个拉曼607 nm通道，将温度结构的轮廓扩展到地面，从30 km向下扩展到地面。 这项提出的努力的第一年将继续观察组件 - 高分辨率的Fabry Perot Etalon和双轴镜系统 - 这对于测量反向散射的Rayleigh和Mie LiDar Spectra的多普勒移动是必要的，以观察中间气氛中的视线风。 将添加一个小的雷达系统，以观察中间大气中的视线。 当任何飞机靠近光束时，将添加一个小的雷达系统以关闭激光发射器。 基于拉曼转移ND激光输出，将在高压拉曼电池中添加新的LiDAR传输通道（607 nm）。 在赠款奖的第二年开始完成这些工具性修改后，新的多普勒激光雷达的应用将通过使用MIE（颗粒）散射和532 nm处的激光回报，从10公里以上的大气中收集中间大气风和温度的垂直轮廓。 这些轮廓将为研究喷气流，行星波，潮汐和重力波的发生，结构，相互作用和可变性提供基础，并在美国落基山山脉延伸的山区上方的中间大气中。 这些波在中间气氛中通过中间气氛过滤的中间气氛的倾斜传播将与BLO中的几种仪器同时观察到在中间区域中同时观察到的动态活动。 温度，密度和风的相关观察结果将在激光雷达和气球和火箭的组合之间进行。 PIS观测值的A将是气溶胶反向散射和高云中的灭绝测量，尤其是薄卷卷和平流层气溶胶的检测。