摘要
零度层亮带(ML)是降水性层状云的一个重要特征,它对雷达定量估计区域降水有很大影响,如何减小这种影响是雷达气象探测非常关心的科学问题。双偏振雷达能够提供双偏振参数信息,在云降水粒子相态识别、粒子尺度分布等方面有优势。利用X波段双偏振雷达观测数据,对差分相位移φDP滤波、又滤波后的φDP由定义式重构得到KDP,对反射率因子ZH以及差分反射率ZDR由KDP订正法进行衰减订正。以距离-高度扫描(RHI)图像为基础,通过双偏振参量纹理法(texture of polarization parameters,TPP)得到纹理参数SD(ZH)、SD(ZDR)、SD(KDP)、SD(ρHV),分析它们在垂直高度上的相对分布识别零度层亮带,并与平均反射率因子垂直廓线识别法(MVPR)进行比较,说明运用双偏振参数纹理法能够更好地识别零度层亮带以及分析研究偏振特征。
Stratiform rain situations are generally associated with the presence of a melting layer. This layer is an important feature as it has an influence on quantity precipitation estimation. How to reduce this effect is a scientific issue of great concern to radar meteorological observation. Dual-polarization radar can provide dual polarization parameter information, which has advantages in cloud precipitation particle phase identification and particle size distribution. In this paper, firstly, use median filtering to suppress the fluctuation of measured differential propagation phase. The attenuated reflectivity factor ZH and differential reflectivity ZDR can be corrected by using observable KDP.A new way to identify the melting layer on RHI scans using texture of polarization parameters(SD(ZH), SD(ZDR), SD(KDP), SD(ρHV)) is proposed and compare it with the mean vertical profile of reflectivity method(MVPR). The result shows that using texture of polarization parameters can identify the melting layer and analyze the polarization characteristics.
作者
冯小真
肖辉
孙跃
姚振东
FENG Xiaozhen;XIAO Hui;SUN Yue;YAO Zhendong(College of Electronic Engineering Chengdu University of Information and Technology,Chengdu 610225;Key Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;University of Chinese Academy of Sciences,Beijing 100049)
出处
《成都信息工程大学学报》
2019年第4期333-341,共9页
Journal of Chengdu University of Information Technology
基金
国家重点研发计划资助项目(2016YFE0201900-02)
国家自然科学基金资助项目(41575037)
国家重点基础研究发展计划(973)资助项目(2014CB441403)
关键词
X波段双偏振雷达
质量控制
零度层
亮带识别
X-band dual polarization radar
attenuation correction
the melting layer
bright band identification
