摘要
退偏振因子（ＬＤＲ）是双线偏振雷达可以获取的一个很重要的云和降水的物理量。从理论上计算了液态和简单的冰相降水粒子对Ｃ波段雷达回波的ＬＤＲ的大小，研究了ＬＤＲ与降水粒子的差反射率因子（ＺＤＲ）、空间取向和尺度大小等因素的关系。研究结果表明：ＬＤＲ与降水粒子的ＺＤＲ、空间取向和相态变化关系密切，它反映了粒子空间取向和粒子形状等信息，结合ＺＤＲ和ＺＨ，利用ＬＤＲ可以更好地研究云中微物理特征及识别冰雹区。为今后在双线偏振雷达上实现ＬＤＲ的测量提供了参考。
Linear depolarization ratio(L-DR) is a important parameter for cloud and precipitation observed by dual linear polarization radar. In this paper, the L-DR of particles with liquid and ice phase for C-band wave-length is calculated,and the relationships between LDR, ZDR and the orientation and size of particles studied. The results show that values of LDR depend on the ZDR,orientations and the phases of particles, the LDR reflects the information of orientation and the shapes of particles, which is valuable for the microphysical process of cloud and the hail distinguishing. The result is reference for the observation of LDR in dual linear polarization radar and the base for the study of cloud and precipitation by the LDR.
出处
《高原气象》
CSCD
北大核心
1997年第4期417-424,共8页
Plateau Meteorology
基金
国家科技攻关项目96-908专项子专题"平凉地区冰雹云识别技术研究"的资助
关键词
双线偏振雷达
退偏振因子
气象雷达
应用潜力
Dual linear polarization radar Depolarized factor Microphysical structure
