摘要
基于双偏振天气雷达的相关研究大部分集中在雷达如何识别粒子相态、精细化探测云系垂直结构方面,专门针对差分反射率因子Z_(DR)柱的识别研究相对较少。通过对海南地区对流云系特征进行分析研究,提出一套基于双偏振雷达探测数据(2020—2021年)的Z_(DR)柱识别方法,结合多源资料对发生在海南地区的2次对流天气过程展开分析,验证Z_(DR)柱识别效果。结果表明:(1)Z_(DR)柱通常在对流云系前中期较为深厚,最大可达0℃层以上3~5 km,在空间分布上Z_(DR)柱与雷达径向速度的辐合有密切关系,其正负径向速度对的差值与Z_(DR)柱的强弱变化规律呈正相关,并且深厚的Z_(DR)柱较大概率出现在对流云系运动方向的前缘位置,与对流云团雷达反射率因子较大区域(≥50 dBz)有明显的对应关系;(2)Z_(DR)柱最大深度的变化趋势同雷达回波顶高和垂直累计液态水含量有弱相关性,雷达回波顶高和垂直累计液态水含量的变化通常滞后于Z_(DR)柱深度的变化(约12~15 min)。该方法具备识别海南岛地区Z_(DR)柱现象的能力,可以在分析强对流天气过程、人工影响天气指挥和短临灾害天气预警等方面发挥应用效益。
Currently,most of the researches based on dual-polarization weather radar focus on the way to identify the various phases of particles and detect the vertical structure of the clouds,and the researches on the identification and characteristics of Z_(DR)column are few.In order to strengthen the application of dual-polarization radar in Hainan,the identification algorithm of the Z_(DR)column based on the dual-polarization radar(2020-2021)is proposed according to the characteristics of convective cloud systems on the Hainan Island.Based on the method,combined with multi-sources data,two convective weather processes in Hainan are analyzed and studied to verify the Z_(DR)column.The results show that the algorithm can identify the Z_(DR)column on the Hainan Island;the algorithm could obtain the spatial distribution of the Z_(DR)column in real-time to analyze the convective weather processes,weather modification and short-term disaster warning.The Z_(DR)column is usually deep in the early and middle stages of the convective clouds,and the maximum can reach 3 to 5 km above the 0℃layer;the Z_(DR)column with deeper spatial distribution is more likely to appear in the direction of the convective cloud movement.The position of the leading edge has a corresponding relationship with the area with large radar reflectivity(≥50 dBz),which continues to deepen with the evolution of the clouds.The average Z_(DR)column depth variation trend has a weak correlation with the radar echo top height and the vertical accumulated liquid water content.The changes of the radar echo top height and the vertical accumulated liquid water content usually lag the Z_(DR)column depth(12 to 15 min).
作者
邢峰华
黄彦彬
李光伟
李思腾
车云飞
毛志远
XING Fenghua;HUANG Yanbin;LI Guangwei;LI Siteng;CHE Yunfei;MAO Zhiyuanl(Hainan Institute of Meteorological Science,Haikou 570203;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203;Institute of Urban Meteorology,CMA,Beijing 100089;Weather Modification Centre,CMA,Beijing 100081)
出处
《气象科技》
2022年第6期859-869,共11页
Meteorological Science and Technology
基金
海南省自然科学基金项目(421QN372)
海南省气象局科研项目(hnqxZC202112)资助。
