潘佳文,高丽,魏鸣,蒋璐璐,蔡菁. 2021. 基于S波段双偏振雷达观测的冰雹偏振特征分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.001
基于S波段双偏振雷达观测的冰雹偏振特征分析
Analysis of the polarimetric characteristics of hail from S band dual polarization radar observations
投稿时间:2020-06-01  修订日期:2020-08-15
DOI:10.11676/qxxb2021.001
中文关键词:  双偏振雷达,冰雹,偏振特征
英文关键词:Dual polarization radar, Hail, Polarimetric characteristics
基金项目:国家自然科学基金(41675029);福建省自然科学基金(2018J01060);福建省气象局基层科技专项(2019J06) ;福建省气象局开放式研究基金(2020KX01)
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 
高丽 台州市气象局 362579619@qq.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 1034542057@qq.com 
蒋璐璐 宁波市气象局 jianglulu87@126.com 
蔡菁 龙岩市气象局 315636571@qq.com 
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中文摘要:
      为了研究雹暴的偏振特征及其在实际业务中的应用,使用S波段双偏振雷达所观测到46例冰雹数据,对其中反复出现的三种偏振特征:冰雹在各高度层的偏振参数特征、差分反射率因子柱、三体散射偏振特征进行了分析,并重点分析了三种偏振特征在大、小冰雹之间的差异。研究表明:(1)大冰雹的水平反射率因子中位数要高于小冰雹,二者的水平反射率因子分布存在较大重合区域。(2)冰雹偏振参数的变化主要集中在融化层之下。相较于小冰雹,大冰雹具有更低的差分反射率因子和相关系数。(3)所有雹暴的差分反射率因子柱最大伸展高度均超过-10℃,有83%的大冰雹事件其差分反射率因子柱最大伸展高度可超过-20℃,在小冰雹事件中这一比例仅为46%。(4) 差分反射率因子柱高度的演变对于雹暴的发展具有预示性,特别是在持续降雹过程中,差分反射率因子柱的再度发展预示雹暴的再次增强。差分反射率因子柱高度的极值相对于降雹具有时间提前量,在大冰雹事件中这一提前量的中位数为24min,而在小冰雹事件中这一数值为11min。(5)三体散射的偏振特征有助于识别高空的冰雹,尤其是当冰雹核的后侧存在其他降水回波时。在本文所统计的19例大冰雹事件均发现三体散射偏振特征。在小冰雹事件中同样可发现三体散射偏振特征,出现比例为52%。
英文摘要:
      This study aimed at investigating the polarimetric radar characteristics of hail storm and application of those characteristics for operational work. A total of 46 hail reports from hail storms that have been observed with the S-band dual-polarization radar are used for this study. Three polarimetric signatures are repeatedly found in these hail storms, which are analyzed as follows:the polarimetric variables of hail in different height intervals, Zdr column, the polarimetric TBSS. The differences between polarimetric signatures of large and small hails are in the focus of our analysis. The study yields the following results. (1) The median value of Zh for large hail is higher than the value for small hail. A significant overlap of the Zh distributions for large and small hail is also present. (2) The variation of polarimetric variables of hail is concentrated below the melting level. Compared with small hail, large hail has lower Zdr and CC values. (3) The maximum height of Zdr column can reach the -10℃ level in all of the hail storms, whereas 83% of large hail reports and 46% of small hail reports with Zdr column that penetrated the -20℃ level. (4) The evolution of the Zdr column height is a favorable index of the development of the hail storm. During the continuous hail process, the re-development of the Zdr column height was earlier than that of the hail storm. It was also shown that a lead time in advance of hail reports provided by peaks in Zdr column height, where peaks occurred about 24 min (median value) prior to large hail reports and about 11 min (median value) prior to small hail reports. (5) The polarimetric TBSS is a good indicator for identifying hail aloft especially when there are other precipitation echoes located radially behind the hail core. In this study the polarimetric TBSS was found in all of the large hail reports, which was also found in the small hail reports with a proportion of 52%.
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