Field Studies of Raindrop Axis Ratio and Orientation Distributions Using an Improved 2D-Video Disdrometer and Dual-Polarized Radar
使用改进的二维视频测距仪和双偏振雷达对雨滴轴比和方向分布进行现场研究
基本信息
- 批准号:0140350
- 负责人:
- 金额:$ 37.85万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2002
- 资助国家:美国
- 起止时间:2002-05-01 至 2006-04-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Polarimetric radar measurements of precipitation contain information about the shape of the precipitation particles. For raindrops, the shape may oscillate with time, but the average shape is approximately spheroidal, and the larger the drop the greater the deviation from spherical. Hence polarimetric measurements of rain contain information about drop size - information in addition to what is provided by the radar reflectivity alone. This is the basis for improved estimates of rainfall rate using polarimetry. This project contributes to radar polarimetry by directly measuring the sizes, shapes, and canting angles of individual drops at the ground. It employs an upgraded version of a video disdrometer manufactured by an Austrian firm, Joanneum Research. This instrument records the front and side view of each individual drop as it falls through a square, horizontal sampling area about 10 cm on the side. It measures the particle size, shape, canting angle, and fall speed. The data enable the calculation of a parameter relevant to polarimetric measurements, called "effective beta," which depends on the relation between size, shape, and canting angle. A recent theory shows that this parameter can also be inferred indirectly from radar observations of three polarimetric quantities, the reflectivity at horizontal polarization, the ratio of the reflectivities at horizontal and vertical polarization, and the differential propagation phase between the two polarization components. Furthermore, knowing the effective beta enables more accurate estimation of the rainfall rate. The purpose of the experiments is to test the theory by comparing radar estimates of beta with the values of this parameter determined directly from the disdrometer-measured properties of the drops. Experiments will be conducted at two sites: in Colorado, using the CSU-CHILL radar, and in Darwin, Australia, in collaboration with the Bureau of Meteorology Research Center. Using these sites will enable the evaluation of the theory in two climatic regimes with possibly different rainfall characteristics. The work should improve the accuracy of rainfall estimation by radar.
极化雷达对降水的测量包含了关于降水粒子形状的信息。 雨滴的形状可能会随时间而振荡,但平均形状近似为球形,并且雨滴越大,偏离球形的程度越大。 因此,对雨水的偏振测量包含了关于雨滴大小的信息--除了由雷达反射率单独提供的信息之外的信息。 这是改进使用偏振测量法估计降雨率的基础。 该项目通过直接测量地面上单个液滴的大小、形状和倾斜角度,为雷达偏振测量做出了贡献。 它采用了一个由奥地利Joanneum研究公司制造的视频光盘测量仪的升级版。 该仪器记录每个单独液滴在其福尔斯通过侧面约10 cm的正方形水平采样区域时的前视图和侧视图。 它可以测量颗粒的大小、形状、倾斜角度和下落速度。 这些数据使得能够计算与偏振测量相关的参数,称为“有效β”,这取决于大小,形状和倾斜角之间的关系。 最近的一个理论表明,这个参数也可以间接推断从雷达观测的三个偏振量,在水平偏振的反射率,在水平和垂直偏振的反射率的比率,以及两个偏振分量之间的差分传播相位。 此外,知道有效贝塔值可以更准确地估计降雨率。 实验的目的是通过比较雷达估计的β值与直接从液滴的disdrometer测量特性确定的该参数的值来测试理论。 实验将在两个地点进行:在科罗拉多,使用CSU-CHILL雷达,在澳大利亚的达尔文,与气象局研究中心合作。 使用这些地点将能够在两种可能具有不同降雨特征的气候条件下评估该理论。 这项工作将提高雷达估测降雨量的准确性。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Viswanathan Bringi其他文献
Aspects of Rain Drop Size Distribution Characteristics from Measurements in Two Mid-Latitude Coastal Locations
两个中纬度沿海地点的雨滴尺寸分布特征的测量
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
M. Thurai;Viswanathan Bringi;David Wolff;C. Pabla;GyuWon Lee;Wonbae Bang - 通讯作者:
Wonbae Bang
Viswanathan Bringi的其他文献
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{{ truncateString('Viswanathan Bringi', 18)}}的其他基金
Collaborative Research: Observational and Numerical Modeling Studies of Rain Microphysics
合作研究:雨微物理的观测和数值模拟研究
- 批准号:
1901585 - 财政年份:2019
- 资助金额:
$ 37.85万 - 项目类别:
Standard Grant
Advanced Comprehensive Analysis of Rain Drop Shapes, Oscillation Modes, and Fall Velocities Using High-Resolution Surface Disdrometers, Polarimetric Radar, and Numerical Models
使用高分辨率表面测距仪、偏振雷达和数值模型对雨滴形状、振荡模式和降落速度进行高级综合分析
- 批准号:
1431127 - 财政年份:2015
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
Synergistic Studies of Raindrop Shapes, Oscillations and Orientations Using 2D-Video Disdrometer, Advanced Radar and Wind Tunnel
使用 2D 视频测距仪、先进雷达和风洞对雨滴形状、振荡和方向进行协同研究
- 批准号:
0924622 - 财政年份:2009
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
Field Studies of Raindrop Axis Ratio Distributions Using an Improved 2D-Video Disdrometer and Dual-Polarized Radar
使用改进的二维视频测距仪和双偏振雷达对雨滴轴比分布进行现场研究
- 批准号:
0603720 - 财政年份:2006
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
Development of a High Performance Offset Gregorian Antenna for the Colorado State University (CSU)-CHILL National Radar Facility
为科罗拉多州立大学 (CSU)-CHILL 国家雷达设施开发高性能偏置格里高利天线
- 批准号:
0216192 - 财政年份:2002
- 资助金额:
$ 37.85万 - 项目类别:
Standard Grant
Advanced Hydrometeor Identification of Severe Storms During STEPS
STEPS 期间严重风暴的高级水凝物识别
- 批准号:
9982030 - 财政年份:2000
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
Coordinated Analysis of Fully Polarimetric CSU-CHILL Radar Signatures with Surface and Airborne Hydrometeor Images
全偏振 CSU-CHILL 雷达特征与地面和机载水凝物图像的协调分析
- 批准号:
9730231 - 财政年份:1998
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
Multiparameter Radar and Aircraft-Based Studies of the Microphysical, Kinematic and Electrical Structure of Convective Clouds During CaPE
CaPE 期间对流云的微物理、运动学和电学结构的多参数雷达和基于飞机的研究
- 批准号:
9410698 - 财政年份:1995
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
Indo-U.S. Workshop on Atmospheric Technology, Bangalore, India, March 1994, Group Travel Award in Indian and U.S. Currencies
印度-美国
- 批准号:
9311818 - 财政年份:1994
- 资助金额:
$ 37.85万 - 项目类别:
Standard Grant
C-Band Polarimetric Radar Studies During CLEOPATRA
CLEOPATRA 期间的 C 波段偏振雷达研究
- 批准号:
9214864 - 财政年份:1992
- 资助金额:
$ 37.85万 - 项目类别:
Continuing Grant
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