Three-dimensional analysis of the initial stage of convective precipitation using an operational X-band polarimetric radar network
Three-dimensional analysis of the initial stage of convective precipitation using an operational X-band polarimetric radar network
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DOI：
10.1016/j.atmosres.2019.03.015
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发表时间：
2019-09
影响因子：
5.5
通讯作者：
Yura Kim;M. Maki;Dong-In Lee;Jong‐Hoon Jeong;C. You
中科院分区：
文献类型：
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作者：
Yura Kim;M. Maki;Dong-In Lee;Jong‐Hoon Jeong;C. You
在这项研究中，我们提出了一个新的方法来分析的初始阶段的局部对流降水。所开发的算法被用来创建三维恒定高度平面位置指示器（3D CAPPI）的数据，这是高时空分辨率的体积数据，使用两个X波段极化雷达，位于日本关东地区。平流矢量估计通过应用归一化互相关方法观测到的连续降水回波在极坐标系上在每个天线倾斜角。估计的平流矢量表示的线性回归模型，取决于时间和倾斜角。此外，三维CAPPI数据利用镶嵌方法从雷达观测中获得进一步的降水信息。该算法产生了详细的三维结构的快速发展的对流单体，并提供对流降水的定量信息，如回波顶高，最大反射率，出现的时间和每个单元的高度。三维CAPPI镶嵌图也清楚地显示了对流降水初期的后建过程。
In this study, we propose a new methodology for analysis of the initial stage of localized convective precipitation. The developed algorithm was used to create three-dimensional constant-altitude plan-position-indicator (3D CAPPI) data, which are high-spatiotemporal-resolution volumetric data, using two X-band polarimetric radars that are located in the Kanto region of Japan. Advection vectors are estimated by applying the normalized cross-correlation method to observed successive precipitation echoes on the polar coordinate system at each antenna tilt angle. The estimated advection vectors are expressed by a linear regression model that depends on time and tilt angle. In addition, 3D CAPPI data utilize the mosaic method to obtain further precipitation information from radar observations. The algorithm produces the detailed 3D structure of rapidly developing convective cells and provides quantitative information on convective precipitation, such as the echo top height, maximum reflectivity, and appearance time and height of each cell. The 3D CAPPI mosaic also clearly shows the back-building process at the initial stage of convective precipitation.