| 双线偏振雷达探测的云和地物回波的特性及其识别方法 |
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| 引用本文： | 刘黎平,王致君.双线偏振雷达探测的云和地物回波的特性及其识别方法[J].高原气象,1996,15(3):303-310. |
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| 作者姓名： | 刘黎平 王致君 |
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| 作者单位： | 南京大学大气科学系(刘黎平)，中国科学院兰州高原大气物理研究所(王致君) |
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| 摘 要： | 双线偏振雷达在定量测量降雨量的过程中，经常受到地物回波的干扰和影响。研究云和地物回波的反射率因子ＺＨ、差反射率因子ＺＤＲ的取值大小及两者的关系、空间变化梯度的结果表明：云的ＺＤＲ大于零，且有明显的随ＺＤＲ大于零、且有明显的随ＺＨ增加而增大的趋势，这反映了在强降雨回波中大粒子占的比例较大；而地物回波的ＺＨ和ＺＤＲ无明显变化规律，ＺＤＲ可正可负；云回波的空间变化率也明显小于地物回波。
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| 关 键 词： | 双线偏振雷达 地物回波 识别法 云 |
THE PROPERTIES OF CLOUD AND CLUTTER ECHOES MEASURED BY DUAL LINEAR POLARIZATION RADAR AND DISCRIMINATION |
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| LIU Liping , WANG Zhijun.THE PROPERTIES OF CLOUD AND CLUTTER ECHOES MEASURED BY DUAL LINEAR POLARIZATION RADAR AND DISCRIMINATION[J].Plateau Meteorology,1996,15(3):303-310. |
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| Authors: | LIU Liping WANG Zhijun |
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| Institution: | LIU Liping 1,2 WANG Zhijun 2 |
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| Abstract: | The clutter echo affects the measurement of rainfall rate and hydrologic forecast with dual linear polarization radar.In this paper,we have studied the range of reflectivity Z H and differential reflectivity Z DR and their spatial distributions in rainfall and clutter regions.The Z DR of rainfall is positive and increases with increase of Z H.This phenomena proved that there are more large particles in the region with great Z H.But for the clutter, the values of Z DR are positive or negative,and there is no obvious relationship between Z H and Z DR ,the spatial variability of Z H and Z DR is greater than rainfall area.Based on these research,we have developed a model of discrimination between rainfall and clutter.The results of test is satisfied.This work is a new method reducing the effects of clutters on the dual linear polarization radar measurement,it can improved the results of measuring rainfall and hydrologic forecast. |
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| Keywords: | Dual linear polarization radar The discrimination clutter echo |
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