潘佳文,蒋璐璐,魏鸣,罗昌荣,高丽,郑秀云,彭婕. 2020. 一次强降水超级单体的双偏振雷达观测分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.003
一次强降水超级单体的双偏振雷达观测分析
Analysis of a high precipitation supercell based on dual polarization radar
投稿时间:2019-05-07  修订日期:2019-08-19
DOI:10.11676/qxxb2020.003
中文关键词:  双偏振雷达,强降水超级单体,风场反演,粒子相态识别
英文关键词:Dual polarization radar, High precipitation supercell, Wind retrieval, Hydrometeor classification
基金项目:国家自然科学基金项目(41675029),福建省气象局开放式基金(2019K03)
作者单位E-mail
潘佳文 海峡气象开放实验室厦门市气象局 358465603@qq.com 
蒋璐璐 宁波市气象局 jianglulu87@126.com 
魏鸣 气象灾害预报预警与评估协同创新中心,南京信息工程大学 mingwei@nuist.edu.cn 
罗昌荣  728652141@qq.com 
高丽  362579619@qq.com 
郑秀云  12722662@qq.com 
彭婕  xmpengj@163.com 
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中文摘要:
      为分析强降水超级单体风暴的偏振特征及其动力和云物理结构。利用厦门海沧双偏振雷达数据及常规观测资料,并采用多普勒雷达风场反演和粒子相态识别等技术,对2018年5月7日发生在闽南地区的一次导致特大暴雨的强降水超级单体风暴进行了分析,研究表明:(1)相关系数低值区出现在有界弱回波区和钩状回波之前,可指示低层上升气流的位置;(2)在前侧下沉气流南侧的反射率因子梯度大值区附近,存在一个浅薄的差分反射率因子大值区,被称为差分反射率因子弧。其形态与超级单体的发展程度有关。在本次过程中差分反射率因子弧先于钩状回波和中气旋出现,对超级单体的发展具有较好的指示性;(3)在中层的融化层上,差分反射率因子大值区和相关系数低值区呈环形围绕在上升气流周围。差分反射率因子环和相关系数环对确定中层上升气流的位置,具有指示意义;(4)差分反射率因子柱位于有界弱回波区的上方,并位于主上升气流附近,在仅有单部雷达进行观测时,差分反射率因子柱可用于识别主上升气流的位置;(5)差分相位常数柱主要由大量混合相态水凝物组成,其位置与地面雨强中心存在较好的对应关系。
英文摘要:
      A high precipitation (HP) supercell accompanied by an extremely heavy rainfall in southern Fujian on 7 May 2018 is analyzed based on the dual polarization radar and regular observation data. The polarimetric signatures, dynamical and microphysical characteristics of HP supercell are analyzed using the Doppler radar wind field retrieval and hydrometeor classification technique. The study reveals:1.In the absence of a clearly defined bounded weak-echo region (BWER) and the hook echo, the area of decreased cross-correlation coefficient (CC) could be used as a proxy for the updraft location.2.A shallow region of very high differential reflectivity (Zdr) was found along the peak reflectivity gradient on the southern edge of the forwardSflankSdowndraft (FFD), which called the Zdr arc. The Zdr arc morphology is associated with the development of the HP supercell. During this process, the occurrence of Zdr arc was earlier than hook echo and the mesocyclone, which was a favorable index of the development of the supercell storm. 3.A midlevel circular ring of enhanced Zdr and depressed CC was found above the environmental melting layer, surrounding the updraft. The Zdr ring and CC ring are good indicators of the updraft location at the midlevel.4.The Zdr column was above the BWER, which at the vicinity of the main updraft. Zdr column can be used to identify the main updraft location, particularly when only one dual-polarization radar data is available. 5.The Kdp column was primarily composed of a large number of mixed-phase hydrometeors, whose location was related with the rainfall intensity center of the surface.
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