Doppler Radar Studies of Meteorological Phenomena

气象现象的多普勒雷达研究

• 批准号: 9105182
• 负责人: Ramesh Srivastava
• 金额: $ 44.99万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1995-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9105182&HistoricalAwards=false
• 关键词: Doppler; Radar; Studies; Meteorological; Phenomena

The objectives of this research are: (1) modeling and observational studies of intense downdrafts. This will involve extensions to the one-dimensional models already in existence, completion and extension of work on the modeling of axially symmetric downdrafts including detailed microphysics. An extension to three dimensions and inclusion of more complete microphysics (drop coalescence and breakup in addition to melting and evaporation) in all the models is anticipated. The results of the various models will be compared with radar and, in particular, surface meteorological data; (2) A comparison of ZDR measured by a radar, with that calculated from the drop size distribution inferred from profiler observations, and studies of the size spectra of raindrops and raindrop oscillations by means of profiler observations; (3) Numerical simulations and theoretical studies of a dual-radar method of measurement of rainwater content and rainfall rate and tests of the method against observations; and (4) A theoretical calculation of the growth of drops by condensation in very slow updrafts, as in stratiform clouds.

本研究的目标是：（1）强烈下降气流的建模和观测研究。 这将涉及对现有一维模型的扩展，轴对称下降气流建模工作的完成和扩展，包括详细的微观物理。 预计所有模型都会扩展到三个维度，并包含更完整的微观物理（除了熔化和蒸发之外，液滴聚结和破碎）。 各种模型的结果将与雷达数据，特别是地面气象数据进行比较； (2) 将雷达测量的 ZDR 与剖面仪观测推断的雨滴尺寸分布计算得出的 ZDR 进行比较，并利用剖面仪观测研究雨滴的尺寸谱和雨滴振荡； （3）双雷达雨水含量和降雨率测量方法的数值模拟、理论研究及观测试验； (4) 对非常缓慢的上升气流（如层状云）中的凝结造成的水滴生长的理论计算。