| 双线偏振多普勒天气雷达估测混合区降雨和降雹方法的理论研究 |
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| 引用本文： | 刘黎平.双线偏振多普勒天气雷达估测混合区降雨和降雹方法的理论研究[J].大气科学,2002,26(6):761-772. |
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| 作者姓名： | 刘黎平 |
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| 作者单位： | 中国气象科学研究院,北京,100081 |
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| 基金项目： | 国家重点基础研究发展规划项目G1998040909、科技部技术开发研究专项资金"双线偏振雷达产品生成软件系统研制"项目和中国气象科学研究院"博士科研启动项目"共同资助 |
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| 摘 要： | 利用冰雹形状和空间取向的模型及降雹和降雨的滴谱分布,分析了C波段双线偏振雷达探测的降雨和冰雹的反射率因子ZH、差反射率因子ZDR和差传播相移KDp的取值范围,及混合区降水中不同大小的降雨降雹强度对这些参量的贡献.结果表明:对于C波段双线偏振雷达来讲,当降雹达到一定强度后,反射率因子反而随降雹强度的增大而减小,反射率因子和降雹强度不一定是一一对应关系,降雹的KDp与相态、空间取向和雹块的尺度均有关系.在混合性降水中,ZH的主要贡献来自冰雹,而KDp主要取决于降雨的大小,降雨和降雹对ZDR均有明显的影响,降雨的ZH和KDP有比较好的对应关系.在此基础上给出了利用ZH、ZDR和KDp定量估测相态混合区冰雹和降雨对应的反射率因子、降雨强度的方法,并从滴谱变化、雷达探测精度和冰雹对KDp的影响分析了这种方法的估测精度.
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| 关 键 词： | 多普勒天气雷达 降雨 冰雹 |
A Theoretical Study of Estimations of Rain and Hail Rates in Mixed-Phase Areas with Dual Linear Polarization Radar |
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| Liu Liping.A Theoretical Study of Estimations of Rain and Hail Rates in Mixed-Phase Areas with Dual Linear Polarization Radar[J].Chinese Journal of Atmospheric Sciences,2002,26(6):761-772. |
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| Authors: | Liu Liping |
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| Abstract: | By using the model of hail shape, orientation and size distributions of rain and hail, the values of reflectivity (ZH ), differential reflectivity (ZDR ) and differential propagation phase shift (KDP) in rain and hail areas, and contributions of rain and hails to those parameters are examined. The results show that the reflectivity of hail measured by C band polarization radar decreases with hail rate when hail rate is large, the KDP in hail is related with the shape, orientation and size of hail. In the mixture of rain and hail, the main contribution of ZH is from hail, and rain is primary factor to affect KDP, and both rain and hail have contribution to ZDR , and ZH and KDP in rain have good correlation. Then we introduce a simple method to estimate hail and rain rates in mixed phase area with ZH, ZDR and KDP , analyze the measured errors with size distribution, radar measurement errors and effects of hail on KDP . |
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| Keywords: | Doppler radar rain hail |
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