Sensitivity of C-Band Polarimetric Radar–Based Drop Size Estimates to Maximum Diameter
Sensitivity of C-Band Polarimetric Radar–Based Drop Size Estimates to Maximum Diameter
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DOI：
10.1175/jamc-d-14-0079.1
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发表时间：
2015-06
影响因子：
3
通讯作者：
L. Carey;W. Petersen
中科院分区：
文献类型：
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作者：
L. Carey;W. Petersen
摘要估算雨滴大小一直是基于极化雷达的降水反演方法的一个长期目标。微分反射率Zdr和中值体积直径D0之间的关系通常是使用来自disdrometer的雨滴尺寸分布观测、雨滴物理模型和雷达散射模型凭经验导出的。因为已知雨滴仪对大雨滴采样不足，所以最大雨滴直径Dmax通常是雨物理模型中的假设参数。C波段Zdr对大于5 mm的液滴直径处的共振散射敏感，这福尔斯落在Dmax的不确定性区域内。先前的研究没有考虑在C波段的共振散射和Dmax的不确定性，在评估液滴大小检索的潜在错误。因此，进行了一系列的实验，通过改变假设的Dmax thr.
AbstractEstimating raindrop size has been a long-standing objective of polarimetric radar–based precipitation retrieval methods. The relationship between the differential reflectivity Zdr and the median volume diameter D0 is typically derived empirically using raindrop size distribution observations from a disdrometer, a raindrop physical model, and a radar scattering model. Because disdrometers are known to undersample large raindrops, the maximum drop diameter Dmax is often an assumed parameter in the rain physical model. C-band Zdr is sensitive to resonance scattering at drop diameters larger than 5 mm, which falls in the region of uncertainty for Dmax. Prior studies have not accounted for resonance scattering at C band and Dmax uncertainty in assessing potential errors in drop size retrievals. As such, a series of experiments are conducted that evaluate the effect of Dmax parameterization on the retrieval error of D0 from a fourth-order polynomial function of C-band Zdr by varying the assumed Dmax thr...