Theoretical study of radar polarization parameters obtained from cirrus clouds
Theoretical study of radar polarization parameters obtained from cirrus clouds
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卷云雷达偏振参数的理论研究
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
S. Matrosov
中科院分区：
文献类型：
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作者：
S. Matrosov
摘要对雷达极化参数表征云冰后向散射进行了理论研究。所考虑的参数是那些常用的雷达偏振测量，如差分反射率（ZDR），线性退偏比（LDR），圆退偏比（CDR），固有的取向度（ORTT）以及传统的反射率。考虑到冰晶的形状和它们的取向的实验数据。结果表明，扁长形的散射体可以区分具有扁圆形状的退偏振比依赖于仰角的分析。计算表明，圆极化参数提供更强的信号在交叉极化通道，也显示了1esser的散射体取向的依赖性相比，线极化参数。传播效应对等效含水量和云厚的偏振参数没有显著影响。
Abstract A theoretical investigation of radar polarization parameters that characterize cloud ice backscattering is presented. The parameters considered were those commonly used in radar polarimetrics such as differential reflectivity (ZDR), linear depolarization ratio (LDR), circular depolarization ratio (CDR), intrinsic degree of orientation (ORTT) as well as conventional reflectivities. Experimental data on the shapes of ice crystals and their orientations are taken into account. Results suggest that prolate-shaped scatterers can be distinguished from those having oblate shapes by analyzing the depolarization ratio dependence on the elevation angle. Calculations suggest that circular polarization parameters provide stronger signals in a cross-polar channel and also show a 1esser dependence on scatterer orientation in comparison with linear polarization parameters. Propagation effects do not significantly affect the polarization parameters for equivalent water contents and cloud thicknesses that are typ...