Lower and Middle Atmospheric Dynamics Using Interferometric Techniques

使用干涉技术研究中低层大气动力学

• 批准号: 9402021
• 负责人: Robert Palmer
• 金额: $ 24.17万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402021&HistoricalAwards=false
• 关键词: Lower; Middle; Atmospheric; Dynamics; Using

9402021 Palmer Knowledge of spatial and frequency domain interferometric (SI/FDI) techniques has progressed to a point where real scientific gains are being obtained. Using these relatively new techniques has provided the scientist with additional observations to investigate the atmosphere. The first phase of the project is the study of the planetary boundary layer (PBL) using a recently acquired 915 MHz radar at the University of Nebraska-Lincoln. We propose to modify the radar so that FDI can be performed. The main goal is to study the effect on gravity wave propagation of low- level jets, which exist in the Great Plains region. The proposed research also extends into the tropo/stratospheric regions, where the PIs are interested in refining the observational methods. Although the idea of "corrected" vertical velocities at VHF wave- lengths was introduced in 1985, recent measurements at multiple wavelengths has cast doubt on this idea. The PIs intend to investigate the problem using the MU radar facility in Japan, where there is a VHF interferometric system along with a UHF boundary layer radar. The effect of the jet stream on refractivity layer tilting will also be investigated using SI techniques. Isentropic surface are known to reverse in tilt above and below a jet stream peak. Japan has an extremely strong jet in the winter and it is proposed to make measurements directly related to studying the jet stream. Using the Sondre Stromfjord radar in Greenland, the MU radar in Japan, and the modified 915 MHz radar in Nebraska, the dependence of FDI techniques on wavelength will be investigated. The FDI techniques can provide an estimate of the vertical extend of turbulent layers, which may have a dependence on radar wavelength. Observations using these three wavelengths should elucidate this problem.

9402021 Palmer空间和频域干涉测量（SI/FDI）技术的知识已经取得了真正的科学成果。使用这些相对较新的技术为科学家提供了额外的观测资料来研究大气。该项目的第一阶段是利用内布拉斯加大学林肯分校最近获得的915 MHz雷达研究行星边界层（PBL）。我们建议修改雷达以便进行外国直接投资。主要目的是研究存在于大平原地区的低空射流对重力波传播的影响。拟议的研究还扩展到对流层/平流层区域，在那里，pi有兴趣改进观测方法。虽然在甚高频波段“校正”垂直速度的想法是在1985年提出的，但最近对多个波长的测量结果对这一想法产生了怀疑。pi打算使用日本的MU雷达设施来调查这个问题，那里有一个VHF干涉测量系统和一个UHF边界层雷达。高速气流对折射率层倾斜的影响也将使用SI技术进行研究。已知等熵面在急流峰值上方和下方的倾斜度反转。日本冬季有很强的急流，建议进行与研究急流直接相关的测量。利用格陵兰的Sondre Stromfjord雷达、日本的MU雷达和内布拉斯加州改进的915 MHz雷达，将研究FDI技术对波长的依赖关系。FDI技术可以提供湍流层垂直延伸的估计，这可能与雷达波长有关。使用这三种波长的观测应该能阐明这个问题。