Electrified Cloud Areas Observed in the SHV and LDR Radar Modes
Electrified Cloud Areas Observed in the SHV and LDR Radar Modes
复制标题
SHV 和 LDR 雷达模式观测到的带电云区域
DOI：
10.1175/jtech-d-18-0022.1
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发表时间：
2019
影响因子：
2.2
通讯作者：
D. MacGorman
中科院分区：
文献类型：
--
作者：
V. Melnikov;D. Zrnic;M. Weber;A. Fierro;D. MacGorman
强大的云内电场使冰粒子排列，可以用偏振分集雷达观测到。对同时发送和接收水平和垂直偏振波（SHV）的同时发送模式以及同时发送单偏振波和同时接收双（正交）偏振波的模式[线性去偏振（LDR）模式]收集的雷达数据进行分析。我们雷达的 SHV 和 LDR 模式之间所需的时间延迟约为 1-4 分钟。数据显示，LDR 模式的倾斜晶体面积大于 SHV 模式的倾斜晶体面积，从而表明 LDR 模式比 SHV 模式对倾斜冰云颗粒更敏感。数据还表明，LDR 模式中的微分相位和相关系数指示倾斜云晶体，并且这些变量通常比之前研究的线性消偏振比对倾斜晶体更敏感。快速扫描雷达（例如具有相控阵天线的雷达）可以在 SHV 和 LDR 模式下顺序运行，从而更好地检测以增强电场为特征的云量。
Strong in-cloud electric fields align ice particles that can be observed with polarization diversity radars. Radar data collected in the simultaneous transmission mode, wherein horizontally and vertically polarized waves are simultaneously transmitted and received (SHV), and in a mode whereby a single-polarization wave is transmitted and dual (orthogonal)-polarization waves are received simultaneously [linear depolarization (LDR) mode] are analyzed. The necessary time delay between the SHV and LDR modes for our radar was about 1–4 min. The data show that the areas of canted crystals from the LDR mode are larger than those from the SHV mode, thereby indicating that the LDR mode is more sensitive to canted ice cloud particles than the SHV mode. The data also demonstrate that the differential phase and correlation coefficient in the LDR mode are indicative of canted cloud crystals and that these variables often are more sensitive to canted crystals than the linear depolarization ratio studied earlier. Rapidly scanning radars such as those with a phased array antenna could operate sequentially in the SHV and LDR modes and thus better detect cloud volumes characterized by enhanced electric fields.