Dual-wavelength Doppler Radar Studies of Thunderstorms

雷暴的双波长多普勒雷达研究

• 批准号: 8719144
• 负责人: Carlton Ulbrich
• 金额: $ 13.45万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-15 至 1990-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8719144&HistoricalAwards=false
• 关键词: Dual; wavelength; Doppler; Radar; Studies

The objective of this research is the relationship between lightning discharges and cloud micro.physical processes using vertically pointing, co.linear, UHF and VHF Doppler radars. In thunderstorms, Doppler spectra taken at UHF and VHF Doppler radars. In thunderstorms, Doppler spectra taken at UHF provide velocity information about precipitation particles, while Doppler spectra taken at VHF provide additional velocity information about the clear air. Simultaneous acquisition of data from these two radars will allow for a complete solution to the problem of transforming Doppler power spectra into particle size descriptions and integral parameters derived from these distributions will be examined for significant changes before and after lightning is detected in the radar beam. Further, the hypothesis that the lightning channel acts as a perfect tracer of the air motion will be tested. And, finally if an absolute calibration of both radars can be obtained, then the wavelength dependence of both the volume reflectivity of lightning and the turbulent intensity will be determined.

本研究的目的是使用垂直指向、共线、UHF 和 VHF 多普勒雷达研究闪电放电与云微物理过程之间的关系。 在雷暴天气中，UHF 和 VHF 多普勒雷达获取的多普勒频谱。在雷暴中，UHF 采集的多普勒频谱提供有关降水粒子的速度信息，而 VHF 采集的多普勒频谱提供有关晴空的附加速度信息。 同时采集这两个雷达的数据将能够完整解决将多普勒功率谱转换为颗粒尺寸描述的问题，并且将检查从这些分布导出的积分参数在雷达波束中检测到闪电之前和之后的显着变化。此外，闪电通道作为空气运动的完美示踪剂的假设也将得到测试。 并且，最后，如果可以获得两个雷达的绝对校准，则将确定闪电体积反射率和湍流强度的波长依赖性。