Three-Body Scattering and Hail Size
Three-Body Scattering and Hail Size
复制标题
三体散射和冰雹大小
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Andrić
中科院分区：
文献类型：
--
作者：
D. Zrnic;Guifu Zhang;V. Melnikov;J. Andrić
摘要三体散射特征是强风暴单体后雷达反射率显示的一个附属物。它是由水凝物和地面之间的多次散射引起的。雷达方程的这种现象进行了重新检查和校正，包括相干波分量产生3分贝以上的功率比以前报道的。此外，还探讨了用冰雹尺度来测量这一现象的可能性。球形冰雹和地面后向散射截面的接受值的前向散射模型被用来试图调和在这个签名与观测的反射率。这项工作表明，签名可以造成小-（<10毫米）到中等-（20毫米）大小的冰雹。本文尝试通过比较冰雹的直接回波和三体散射回波来估算冰雹的大小。该理论表明，基本的模糊性，在尺寸检索造成的共振效应。尽管理论排除了冰雹的数量...
Abstract The three-body scattering signature is an appendage seen on weather radar displays of reflectivity behind strong storm cells. It is caused by multiple scattering between hydrometeors and the ground. The radar equation for this phenomenon is reexamined and corrected to include the coherent wave component producing 3 dB more power than previously reported. Furthermore, the possibility to gauge hail size causing this phenomenon is explored. A model of forward scattering by spherical hail and accepted values of ground backscattering cross sections are used in an attempt to reconcile the reflectivity in this signature with observations. This work demonstrates that the signature can be caused by small- (<10 mm) to moderate- (20 mm) sized hail. An effort to gauge hail size by comparing the direct return from hail with the three-body scattered return is made. The theory indicates fundamental ambiguities in size retrieval resulting from resonant effects. Although theory eliminates the number of hailstones...