利用基于双极坐标参数的冰雹大小判别算法开展山东省冰雹案例研究

IF 1.8 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Frontiers of Earth Science Pub Date : 2024-08-24 DOI:10.1007/s11707-024-1113-2
Juxiu Wu, Fan Xia, Jiawen Pan, Guanglu Han, Weijia Sun, Chen Gu
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引用次数: 0

摘要

为满足中国 S 波段双极化雷达的本地化要求,分析了山东省冰雹大小判别算法(HSDA)及其识别冰雹的能力。根据山东冰雹数据统计,使用优化的成员函数阈值,得到了改进的 HSDA。结果通过超级暴雨过程进行了验证。1) 改进后的 HSDA 提高了对大冰雹和巨冰雹的识别能力。结果与不同大小冰雹的散射和偏振参数特征、超级暴雨的动态和微物理特征以及实际情况的分析一致。2)冰雹大小的水平和垂直分布特征与较大冰雹的生长过程和超级冰雹中降水粒子过滤机制的分析相一致。小冰雹首先在悬浮回波处形成,然后在上升气流的推动下注入有界弱回波区上方的大冰雹生长区,与 KDP 柱中丰富的过冷却水碰撞。最后,大冰雹和巨冰雹落在上升气流方向附近,形成强回音壁,巨冰雹落在距中心上升气流 6-12 公里处。3) ZDR 和 KDP 柱的最大值可用于预测冰雹的生长趋势,在超级暴风雪的高空重雹生长阶段,冰雹的生长趋势超过了 -20°C 等温线。当冰雹落到地面时,ZDR 柱缩短,KDP 柱消失,这为极坐标雷达提供了冰雹生长消耗过冷却水的观测依据。
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Case studies of hailstorms in Shandong Province using hail size discrimination algorithm based on dual Polarimetric parameters

The hail size discrimination algorithm (HSDA) and its capacity to identify hail in Shandong Province are analyzed to satisfy the localized requirement by China’s S-band dual-polarization radars. A modified HSDA is obtained by using optimized membership function thresholds based on the statistics of Shandong hail data. The results are verified by a supercell storm process. 1) The modified HSDA improves the identification of large hail and giant hail. The results are consistent with the analysis of the scattering and polarization parameter characteristics of different-size hails, the dynamic and microphysical characteristics for supercell, and the real situation. 2) The horizontal and vertical hail-size distribution characteristics are consistent with the analysis about the growth process of larger hails and the precipitation particles filtering mechanisms in supercells. Small hail first forms at the suspension echo, then is injected into the larger hail growth area above the bounded weak echo area driven by updrafts, colliding with the abundant supercooled water in the KDP column. Finally, large hail and giant hail fall near the direction of the updrafts to form a strong echo wall, and giant hail falls 6–12 km from the central updraft. 3) The maxima of the ZDR and KDP columns can be used to predict the hail-growth trend, which exceeds the −20°C isotherm for the heavy-hail growth stage at high-altitude in the supercell storm. When hail falls to the ground, the ZDR column shortens and the KDP column disappears, which provides the observation basis from polarimetric radars for the consumption of supercooled water by hail growth.

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来源期刊
Frontiers of Earth Science
Frontiers of Earth Science GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
5.00%
发文量
627
期刊介绍: Frontiers of Earth Science publishes original, peer-reviewed, theoretical and experimental frontier research papers as well as significant review articles of more general interest to earth scientists. The journal features articles dealing with observations, patterns, processes, and modeling of both innerspheres (including deep crust, mantle, and core) and outerspheres (including atmosphere, hydrosphere, and biosphere) of the earth. Its aim is to promote communication and share knowledge among the international earth science communities
期刊最新文献
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