Radar and Lightning Observations of Deep Moist Convection across Northern Alabama during DC3: 21 May 2012
Radar and Lightning Observations of Deep Moist Convection across Northern Alabama during DC3: 21 May 2012
复制标题
DOI：
10.1175/mwr-d-14-00250.1
复制
发表时间：
2015-07
影响因子：
3.2
通讯作者：
R. Mecikalski;A. Bain;L. Carey
中科院分区：
文献类型：
--
作者：
R. Mecikalski;A. Bain;L. Carey
摘要深对流云和化学（DC3）实验旨在了解深湿对流闪电行为的运动学和微物理控制。这项研究利用阿拉巴马州北部的多个双偏振多普勒雷达来量化通常作为闪电前兆的微物理和运动学特性和过程，例如霰体回波体积、霰体质量和对流上升气流体积。这里的重点是 2012 年 5 月 21 日 DC3 期间在阿拉巴马州北部发生的一种多细胞复合体。充电区的霰体回波体积和霰体质量与总闪电频率（FR）相关性很好，甚至优于上升气流体积和最大上升气流速度。闪光长度尺度（LS）和闪光面积通常与 FR 反相关，而与非降水冰体积相关。更具体地说，较小的闪光的存在与较强的较低正电荷区域有关...
AbstractThe Deep Convective Clouds and Chemistry (DC3) experiment seeks to understand the kinematic and microphysical controls on the lightning behavior of deep moist convection. This study utilized multiple dual-polarization Doppler radars across northern Alabama to quantify microphysical and kinematic properties and processes that often serve as precursors to lightning, such as the graupel echo volume, graupel mass, and convective updraft volume. The focus here was on one multicellular complex that occurred on 21 May 2012 in northern Alabama during DC3. The graupel echo volume and the graupel mass in the charging region correlated well with the total lightning flash rate (FR), and even better than the updraft volumes and maximum updraft velocities. The flash length scales (LS) and flash areas were generally anticorrelated to the FR, while it was correlated to the nonprecipitation ice volume. More specifically, the presence of smaller flashes was associated with a stronger lower positive charge region ca...