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一次长生命史超级单体降雹演化机制及双偏振雷达分析
高丽1, 潘佳文2, 蒋璐璐3, 翁之梅1
(1.台州市气象局;2.海峡气象开放实验室,厦门市气象局;3.宁波市气象局)
Analysis of evolution mechanism and characteristics of dual polarization radar of a hail caused by long-lived supercell
gaoli1, Pan jiawen2, Jiang lulu3, weng zhimei1
(1.Taizhou Meteorological Bureau;2.Laboratory of Straits Meteorology, Xiamen Meteorological Bureau;3.Ningbo Meteorological Bureau)
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投稿时间:2020-03-05    修订日期:2020-10-21
中文摘要: 2019年3月21日一次长生命史超级单体导致浙江省中部多个县市降雹,[目的]为了研究超级单体得以长时间维持的环境背景及其云物理特征,[资料和方法]利用常规资料以及宁波S波段双偏振雷达数据,结合粒子相态识别算法对此次过程的演变进行了分析。[结果与结论]结果表明:高空槽前、850hPa切变线附近和地面冷锋为超级单体提供了合适的环流背景;风暴传播区域对流不稳定度的增加、风暴承载层的平均风向与风暴移动方向相近、风速大及地面能量锋区向东传播,沿海强垂直风切变导致中气旋旋转速度和旋转厚度的增加,是对流风暴长时间维持的原因。通过此次降雹单体风暴结构分析发现:整个生命史中对流发展非常旺盛,最大反射率维持在60dBZ以上,风暴顶维持在8km以上,风暴质心高度出现三次明显波动,对应三次降雹过程。垂直累积液态含水量VIL跃增量不及传统指标,但结合垂直累积液态含水量密度VILD、VIL最大值及最大反射率因子大值区,对冰雹业务预报有指示作用。通过降雹单体双偏振特征分析发现:冰雹下落过程中的翻滚现象,导致Zdr值接近0dB,水平和垂直偏振波差异导致TBSS根部Zdr大值区的出现;冰雹降落融化产生的外包水膜现象使其Zdr值增大,CC值减小;通过偏振参数Zdr和CC特征,有助于识别高空大冰雹;超级单体的BWER附近的Zdr柱不仅可指示上升运动,同时对降雹单体不同的成长阶段具有指示作用。
Abstract:On March 21, 2019, a hail process caused by long-lived supercell, occurred in Zhejiang Province. In order to study the environmental background and microphysical characteristics of supercell which maintained for a long time, it is analyzed by using conventional data, Ningbo S-band dual polarization radar data and hydrometeor classification algorithm. The results show that: the trough, 850hPa shear line and the surface cold front provided the suitable background for the supercell. The increase of convective instability in the storm propagation area, high speed of storm bearing layer, the similarity of the mean wind direction of the storm bearing layer and moving direction of the storm, as well as the surface energy front, and the increase of rotation speed and thickness of mesocyclone produced by the enhancement of strong vertical wind shear in the coastal area, which maked the convective storm maintain for a long time. Through the analysis of the structure of the hailstorm, the vigorous convection (the maximum reflectivity above 60dBZ, the storm top above 8km) was found in the whole life cycle, and three obvious fluctuations of height of storm centroid appeared, corresponding to three hail processes. In this case the vertical integrated liquid water content (VIL) jump increment was less than the traditional index, but the combination of the vertical integrated liquid water content density (VILD), the max VIL and the maximum reflectivity factor could still indicate the hailstorm. Through the analysis of the dual polarization characteristics, it is found that the tumbling of falling hail resulted in the Zdr close to 0dB, difference of horizontal and vertical polarization wave leaded to the appearance of large Zdr region at the root of TBSS, and the water coated phenomenon maked it increase and CC value decrease; the polarization parameters Zdr and CC could be used to identify hail in high altitude; Zdr column, near BWER, could not only indicate the ascending motion, but also reveal the different growth stages of hail monomer.
文章编号:202003050064     中图分类号:    文献标志码:
基金项目:国家自然科学基金(41675029)、浙江省气象科技计划项目(2019QN23,2019YB12)、福建省气象局基层科技专项(2019J06)
Author NameAffiliationE-mail
gaoli Taizhou Meteorological Bureau 362579619@qq.com 
Pan jiawen   
Jiang lulu   
weng zhimei   
引用文本:
高丽,潘佳文,蒋璐璐,翁之梅,0.Analysis of evolution mechanism and characteristics of dual polarization radar of a hail caused by long-lived supercell[J].Meteor Mon,():-.
gaoli,Pan jiawen,Jiang lulu,weng zhimei,0.Analysis of evolution mechanism and characteristics of dual polarization radar of a hail caused by long-lived supercell[J].Meteor Mon,():-.