| 毫米波雷达与雨滴谱仪观测弱降水的对比分析 |
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| 引用本文： | 谢,蕾,刘黎平,姚,雯.毫米波雷达与雨滴谱仪观测弱降水的对比分析[J].成都信息工程学院学报,2014(1):39-46. |
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| 作者姓名： | 谢 蕾 刘黎平 姚 雯 |
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| 作者单位： | [1]成都信息工程学院电子工程学院,四川成都610225 [2]中国气象科学研究院灾害天气国家重点实验室,北京100081 |
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| 基金项目： | 973资助项目（2012CB417202）;国家自然基金资助项目（41175038,41105122） |
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| 摘 要： | 针对毫米波雷达测量的数据需要进行验证,提出利用雨滴谱反演雷达观测量:回波强度、径向速度、速度谱宽和归一化的功率谱密度数据对比毫米波雷达在最低有效观测高度处探测弱降水数据的方法及分析毫米波雷达观测量误差来源。结果表明:2种观测仪器得到的回波强度随时间变化趋势大致相同但变化幅度差异较大,误差主要源于雷达天线的积水;径向速度由于空气的上升速度、湍流等影响使两者数值有一定差异,但是变化趋势却十分接近。速度谱宽两者结果是演变趋势和变化范围都非常接近;两者归一化功率谱值曲线随速度变化趋势相似,然而由于空气的上升速度、湍流等影响导致两者曲线出现整体平移。
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| 关 键 词： | 信息与通信工程 气象雷达 雨滴谱 回波强度 径向速度 速度谱宽 归一化的功率谱 |
Comparative Analysis of Weak Precipitation Observation with Cloud Radar and Disdrometer |
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| XIE Lei,LIU Li-ping,YAO Wen.Comparative Analysis of Weak Precipitation Observation with Cloud Radar and Disdrometer[J].Journal of Chengdu University of Information Technology,2014(1):39-46. |
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| Authors: | XIE Lei LIU Li-ping YAO Wen |
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| Institution: | 1. School of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China; 2. State Key Labora- tory of Severe Weather, Chine Academy of Meteorological Sciences, Beijing 100081, China) |
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| Abstract: | In this paper, the algorithm to examine the cloud radar observed the parameters was presented. The reflec- tivity, velocity, spectral width and Doppler spectral density data were calculated from the disdrometer data, and used to evaluate the observed parameters at a low level by cloud radar and analyze the source of observation error by cloud radar. The results showed that the changes of the refleetivity measured by the cloud radar and the disdrometer are roughly similar over time, but they are quite different in magnitude. The water over the cloud radar antenna reduced the reflectivity greatly; the air rise and turbulence and so on obstructed the radial velocity, which contributes to the notable differences of the values. However, trends were close to each other; the spectral width by cloud radar and disdrometer were corresponded well; the trends of Doppler spectral density data of both were roughly similar, but the air rise and turbulence and so on caused the curves offsetting. |
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| Keywords: | information and communication engineering weather radar rain droplet size spectrum reflectivity locity spectral width doppler spectral density data |
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